The reactivity of an element depends upon the number of valence electrons, i.e., the electrons present in the outermost shell.
The number of electrons withinside the outermost shell of an atom determines its reactivity. Noble gases have low reactivity due to the fact they've complete electron shells. Halogens are extraordinarily reactive due to the fact they with ease advantage an electron to fill their outermost shell. Non-reactive metal atoms have whole outer shells and therefore do now no longer generally tend to lose, advantage, or percentage electrons. So, all factors having a crammed outermost shell are non-reactive. They also are referred to as noble gases. An element's reactivity is decided via way of means of the number of protons determined in an atom of the element.
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What is the mass of 10 g?
The amount of matter contained within an object is commonly referred to as mass. The most typical way to measure it is as inertial mass, which refers to an object's resistance to acceleration under the influence of a net force.
Although the size of an object and its mass are frequently associated, larger objects do not always have more mass. For instance, an inflated balloon would have substantially less mass than a silver golf ball. Although there are numerous alternative units used to describe mass around the world, the kilogram is the accepted unit of mass according to the International System of Units (SI) (kg).
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The boiling point of acetone is 50.5°C, while the boiling point of water is 100°C. Bringing a solution made of water and acetone to which of the following temperatures would allow the separation of these two liquids?
The temperature must be greater than 50.5°C and less than 100°C.
What is temperature ?
Temperature is a physical property that is used to measure the average kinetic energy of particles in a system, such as a gas, liquid, or solid. It is measured in units of degrees on the Celsius, Fahrenheit, or Kelvin scales.
Temperature is related to the average kinetic energy of particles in the system, and is affected by the number of particles, their mass, and the strength of their interactions.
Which temperature range is typical?
Core temperature is 98.6 F on average (37 C). However, the average body temperature might be anywhere from 97 F (36.1 C) to 99 F (37.2 C) or higher. Depending on the period of year or how busy you are, your body temperature may change. In general, elderly people's temperature are lower than those of younger people.
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What do these two changes have in common?
a slice of banana turning brown
acid rain weathering a marble statue
Select all that apply.
Both are only physical changes
Both are only chemical changes
Both are caused by heating
Both are caused by cooling
Answer:
both are only physical changes
Answer:both are only chemical
Explanation:
absorbance is directly proportional to ___________________________.
The concentration which determines how much radiation is absorbed, increases together with the absorbance.
One factor that influences a sample's absorbance is concentration (c). It would be reasonable to suppose that more radiation will be absorbed as the concentration rises, raising the absorbance. As a result, the relationship between concentration and absorbance is straightforward.
Another component is the path length (b). The absorbance rises as the length of the radiation beam and the number of molecules in its path do as well. As a result, the concentration is inversely related to the distance traveled. As you are undoubtedly already aware from earlier experiences, a particular chemical species absorbs some wavelengths of radiation but not others.
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The complete question as follows
Why is absorbance directly proportional to concentration?
9. Convert 17.92 L of CO to grams:
C- 12.011
0-15.999
Answer in FOUR Sig Figs with Units
Answer:
its correct answer is 22.4 grams
Which of the following sets contains elements that will form ions with a charge of 2-? a. As, P, and N b. Te, S, and c. Si, P, and S d. Sr, Ca, and Be
Te, S, and c are the following sets of elements, and they will all produce ions with a charge of two (option b).
An element is what?An essential element of a totality. In chemistry, a simple substance is one that cannot be divided into smaller components or transformed into another substance. An element's fundamental building block is an atom, which is made up of protons, neutrons, & electrons. The number of atoms in an element's protons is continuous.
What do you mean by nature elements?Earth, Water, Wind, Fire, Ice, Thunder, Time, Flower, Shadow, Light, and Moon are the twelve natural elements. These simplified terminology for more advanced and complicated compounds refer to each of these elements.
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A student increases the temperature of 300 cm balloon from 30 cm to 60 cm what will the new volume be of the balloon be(remeber to be careful with the units. )
After solving the equation: The new volume of the balloon will be 600 cm3.
What is volume?Volume is a measure of the three-dimensional space occupied by a substance or object. In chemistry, volume is most commonly measured in liters (L). It is used to measure the amount of a substance that is present. For instance, when performing a reaction, the volume of the reactants is measured to determine the molar amounts of the reactants.
This is because the volume of a balloon is directly proportional to its temperature. So when a balloon is heated, the volume increases. In this case, the balloon's temperature was increased by 30 cm, so the volume was increased by 300 cm3 (30 cm x 10 cm3, since the volume of a balloon is proportional to its temperature to the power of 3). Thus, the new volume is 600 cm3 (300 cm3 + 300 cm3).
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A 13.1-g sample of ice at −17.9°C is mixed with 103.5 g of water at 73.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H2O(s) and H2O(l) are 2.03 and 4.18 J/g·°C, respectively, and the enthalpy of fusion for ice is 6.02 kJ/mol.
The final temperature of the mixture when no heat loss to the surroundings is equal to 69.57 °C
What is the specific heat capacity?The specific heat capacity can be defined as the amount of heat required to increase the temperature in 1 unit of substance by 1° Celcius.
The specific heat capacity can be expressed in the form of the mentioned formula below:
Q = mSΔT
The specific heat capacity of the water, S = 4.184 J/g°C
The heat lost by water = heat gained by the ice
Heat lost by water = heat gained by the ice + heat increased by the water
m₁S₁ (T₂ - T₁) = m₂L + m₂S₂ (T₂ - T₁)
103.5 × 4.18 × (73- T) = 13.1 × (2.03) + 5 × 4.18 × (T-0)
31582 - 432.63 T = 26.59 + 20.9 T
453.53 T = 31555
T = 69.57 °C
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Which of the following geometries for the complex ion [Fe(en)Cl4]? are possible?
O linear
O trigonal bipyramidal or square pyramidal
O octahedral
O trigonal planar
O tetrahedral or square planar
The following geometry for the complex ion [Fe(en)Cl4] is : octahedral.
What is meant by molecular geometries?The arrangement of atoms in a molecule in three dimensions is known as molecular geometry, commonly referred to as the molecular structure. A compound's polarity, reactivity, phase of matter, color, magnetism, and biological activity can be determined by knowing its molecular structure.
Tetrahedral molecular geometry is present here (e.g. CH4). Trigonal pyramidal molecular geometry results from having three bond pairs and one lone pair of electrons (e.g. NH3). The geometry of the molecule is angular or curved if there are two bond pairs and two lone pairs of electrons (e.g. H2O).
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In general, which of the following ranks the repulsions indicated from weakest to strongest? O Lone pair-bonding pair, lone pair-lone pair, bonding pair---bonding pair O Bonding pair-bonding pair, lone pair-bonding pair, lone pair-one pair O Lone pair-lone pair, lone pair-bonding pair, bonding pair-bonding pair O Lone pair-bonding pair, bonding pair-bonding pair, lone pair-one pair
Option B, Bonding pair-bonding pair, lone pair-bonding pair, lone pair-lone pair. The electrons in bonding pairs are repulsion held relatively closely together, and are involved in the formation of a chemical bond.
The repulsion between two bonding pairs is relatively weak, as they are attracted to the positively charged nuclei of the atoms they are bonding. The repulsion between a lone pair of electrons and a bonding pair of electrons is generally stronger than that between two bonding pairs because the lone pair is not involved in bonding and tends to be held further away from the nucleus, causing the electron cloud to be larger and thus a stronger repulsion because the two lone pairs are not involved in bonding, and are held relatively far away from the nuclei, causing the electron clouds to be larger and thus a stronger repulsion
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i need help asap now answer all blanks
Answer:
2
Explanation:
You want the coefficient of silver iodide in the equation ...
_AgI +_Na₂S ⇒ _Ag₂S +_NaI
Balanced equationThe equation is balanced when the numbers of each of the species is the same on each side of the equation.
We can write four equations in the four unknowns to find the coefficients, or we can use a little guesswork.
If we suppose the coefficient of silver sulfide (Ag₂S) is 1, that tells us the coefficient of silver iodide (AgI) will be 2. If that is the case, then there are two atoms of iodine that will make the coefficient of NaI be 2. This is consistent with the coefficient of Na₂S being 1, giving one Sulfur atom on each side of the equation.
The balanced equation is ...
2AgI +Na₂S ⇒ Ag₂S +2NaI
The coefficient of silver iodide is 2.
__
Additional comment
If the reaction is ...
a·AgI + b·Na₂S ⇒ c·Ag₂S + d·NaI
We can write the relationships between the coefficients as follows. This ultimately gives rise to 3 equations in 4 unknowns, so the choice of any given coefficient is arbitrary. We choose to use the smallest integers that satisfy the conditions.
The balance for Ag is ...
a = 2c
The balance for I is ...
a = d
The balance for Na is ...
2b = d
The balance for S is ...
b = c
Then, in terms of 'a' and 'b', we have ...
a = d = 2b = 2c
For b = c = 1, a = d = 2, as we determined above.
A sample of n2o gas has a density of 3.10 g/l at 298 k.what must be the pressure of the gas (in mmhg)?
P=___mmHg
The pressure of N2O gas at a density of 3.10 g/L and a temperature of 298 K is 751 mmHg. To calculate the pressure of the N2O gas at a given density and temperature, we can use the ideal gas law: PV = nRT.
We know that the density of the gas is 3.10 g/L, and the temperature is 298 K. To find the pressure, we can assume that the volume of the gas is 1 L, and solve for pressure. where P is the pressure of the gas, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
The density of a gas can be converted to moles using the formula:
Density = m/V
m = Density*V
Now we can use the ideal gas law to calculate the pressure:
P = (mRT)/V
R is the ideal gas constant = 0.0821 L atm K^-1 mol^-1
P = (3.10g0.0821 L atm K^-1 mol^-1298 K)/1 L
P = 751 mmHg
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Question 3 (5 points) (02.06 MC) The table compares some characteristics of two atoms_ Charged Particles Atom Number 0f Neutrons Mass Number] Use the table t0 determine the number of protons for each atom: Then_ choose the statement below that Is true about the two atoms_ points) Atom X and Atom are in the same row; but not the same family; on the periodic table Atoms X and Atom Y are in the same family; but not the same row; in the periodic table; Atom Xis in a column to the right of Atom Y in the periodic table: Atom X and Atom occupy the same position in the periodic table because they are isotopes'
Atoms are basically the smallest units of matter. They are made up of protons, neutrons and electrons.
What is the Periodic table?The periodic table is a tabular arrangement of the chemical elements which are organized on the basis of their atomic numbers, electron configurations, and recurring chemical properties. The periodic table lists the elements in order of increasing atomic number and grouped into rows (periods) and columns (groups). The elements in the same column have similar chemical properties, with the elements in the same row having similar outer electron configurations.
Atom X: Number of protons = 6
Atom Y: Number of protons = 6
b. Atoms X and Atom Y are in the same family; but not the same row; in the periodic table.
Hence, Option B is correct.
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The question is:
Question 3 (5 points) (02.06 MC) The table compares some characteristics of two atoms_ Charged Particles Atom Number 0f Neutrons Mass Number] Use the table t0 determine the number of protons for each atom: Then_ choose the statement below that Is true about the two atoms_ points) Atom X and Atom are in the same row; but not the same family; on the periodic table Atoms X and Atom Y are in the same family; but not the same row; in the periodic table; Atom Xis in a column to the right of Atom Y in the periodic table: Atom X and Atom occupy the same position in the periodic table because they are isotopes.
The reaction of ethane gas C2H6 with chlorine gas produces C2H5Cl as its main product along with HCl. (In addition, the reaction invariably produces a variety of other minor products, including C2H4Cl2, C2H2Cl3, and others. Naturally, the production of these minor products reduces the yield of the main product.) (a) Write out the complete, balanced chemical reaction of main reaction taking place. (b) Calculate the percent yield of C2H5Cl if the reaction of 300. grams of ethane with 650. grams of chlorine produced 490. grams of C2H5Cl.
a) The balanced equation is :
C₂H₆ + Cl₂ ---> C₂H₅Cl + HCl
b) The percent yield is the 83.0 % %.
a) The balanced equation is given below :
C₂H₆ + Cl₂ ---> C₂H₅Cl + HCl
b) mass of the ethane = 300 g
molar mass of the ethane = 30 g/mol
moles of the ethane = 300 / 30
= 10 mol
mass of chlorine = 650 g
molar mass of the chlorine = 71 g /mol
moles = 650 / 71
= 9.15 mol
it is clear the the chlorine is the limiting reactant.
1 mole of the chlorine produces the 1 mole of the C₂H₅Cl
moles of the C₂H₅Cl = 9.15 mol
mass of the C₂H₅Cl = 9.15 × 64.5
= 590.175 g
The percent yield = (experimental yield / theoretical yield ) × 100 %
= ( 490 / 590 .175 ) × 100 %
= 83.0 %
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How did the pressure in the left intrapleural cavity change when the valve was opened?
O The pressure in the intrapleural cavity equalized with the atmospheric pressure.
O It went from a positive number to a negative number.
O It went from a positive number to a negative number and the pressure in the intrapleural cavity equalized with the atmospheric pressure.
O It went from a negative number to zero and the pressure in the intrapleural cavity equalized with the atmospheric pressure.
O It went from a negative number to zero.
The pressure in the left intrapleural cavity changes when the valve was opened as : It went from negative number to zero and the pressure in intrapleural cavity equalized with the atmospheric pressure.
What is meant by intrapleural cavity?The pressure inside the pleural cavity is called as intrapleural pressure. It is characterized as negative pressure when the pressure inside the pleural cavity is typically only a little bit lower than the ambient pressure.
The external intercostal muscles and diaphragm contract during inspiration, expanding the thoracic cavity. As a result, the intrapleural pressure decreases, increasing the transpulmonary pressure and expanding the lungs.
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How many gram i hydrogen ga (H2) are in 2600 ml comtainer at 35 degree celiu and a preure of 165 mmHg
108gm of hydrogen gas is present in2600ml container at 35-degree Celsius and at pressure of 165mm Hg.
Given data:
water = 2600ml
temp = 35°C & 95k
pressure = 165mm Hg & 0.162atm
From given information we apply ideal das equation to get moles.
PV = nRT
0.162atm * 2600ml = n 0.0821 * 95k
n = 54
Now we know 1 mole of hydrogen contain 2.016gm hydrogen.
In 54 moles we have 108gm hydrogen.
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if elements have the same number of valence electrons, they are
a) called halogens
b) called noble gases
c) in the same group
d) in the same period
Answer:
c
Explanation:
valence is the number of electrons in the outer most she'll.. therefore all elements in the same group have the same valences for example group one elements have a valence of one
I hope this helps
Which molecular geometry, of an ABn molecule, results in a polar molecule?
O tetrahedral
O trigonal pyramidal
O square planar
O linear
Answer:
trigonal pyramidal
Explanation:
In the case of water.
At 161 K, SiH4 boils but SiO2 remains as a solid. Using principles of interparticle forces, explain the difference in boiling points.
The boiling point of a substance is determined by the strength of the interparticle forces between molecules.
What is boiling point?Boiling point is the temperature at which a liquid changes state from liquid to gas, also known as its vaporization point. The boiling point of water at sea level is 100°C (212°F).
In the case of SiH4, the boiling point is higher than that of SiO2 due to the stronger nature of the intermolecular forces. This is because SiH4 is held together by stronger hydrogen bonds, resulting in more energy needed to break apart the molecules. On the other hand, SiO2 is held together by weaker dipole-dipole interactions and London dispersion forces, meaning it requires less energy to break apart the molecules and thus has a lower boiling point.
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What does the World Skin Cancer Map tell you about how the skin cancer rates of Australia and Brazil differ?
The World Skin Cancer Map shows that Australia has much higher skin cancer rates than Brazil. In Australia, an estimated 5.4 out of 100 people will develop melanoma in their lifetime, compared to 0.4 out of 100 in Brazil.
What is Skin Cancer?Skin cancer is a type of cancer that affects the skin cells. It is caused by over-exposure to ultraviolet (UV) radiation from the sun and sun beds. It is the most common type of cancer in the United States, and can affect anyone, regardless of age, gender, or skin color. It is very important to protect your skin from the sun by using sunscreen.
Australia also has higher rates of non-melanoma skin cancer, with estimated rates of 24.3 out of 100 people in Australia, compared to 5.3 out of 100 people in Brazil.
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There are two different isotopes of bromine atoms. Under normal conditions, elemental bromine consists of Br2 molecules, and the mass of a Br2 molecule is the sum of the masses of the two atoms in the molecule. The mass spectrum of Br2 consists of three peaks:
Mass (amu) Relative Size
157. 836 0. 2569
159. 834 0. 4999
161. 832 0. 2431
(a) What is the origin of each peak (of what isotopes does each consist)?
(b) What is the mass of each isotope?
(c) Determine the average molecular mass of a Br2 molecule.
(d) Determine the average atomic mass of a bromine atom.
(e) Calculate the abundances of the two isotopes
There are two isotopes of bromine atom⁷⁹Br, ⁸¹Br.
a) Each peak originates from a different isotope of bromine. Each peak is composed of a different isotope of bromine. The mass of each isotope is the sum of the masses of the two atoms in the molecule. The average molecular weight of Br_ molecules is 36.184 g/mol.
b) The isotope of bromine has an atomic weight of 78.92 amu and a relative abundance of 50.69. The other major isotope of bromine has an atomic mass of 80.92 amu and a relative abundance of 49.31.
c) The average molecular mass of a [tex]Br_{2}[/tex] = 159.8066274.
d) The average atomic mass of Bromine is found to be. 9 u or 79.9 g mol⁻¹.
e) Bromine has two stable isotopes, ⁷⁹Br and ⁸¹Br, having relative mass abundances of 50.686% and 49.314%
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Estimate how much heat in joules is released when 25. 0 g of water (C = 4. 184 J/g°C) is cooled from 80. 0°C to 30. 0°C?
The heat in joules is released when 25. 0 g of water (C = 4. 184 J/g°C) is cooled from 80. 0°C to 30. 0°C is -5210 J
To find the amount of heat released when a substance is cooled, we can use the equation:
q = mcΔT
where q is the amount of heat (in joules), m is the mass of the substance (in grams), c is the specific heat capacity of the substance (in joules per gram per degree Celsius), and ΔT is the change in temperature (in degrees Celsius).
Given the information in the question, we have:
m = 25.0 g
c = 4.184 J/g°C
ΔT = 30.0°C - 80.0°C = -50.0°C
So, we can substitute these values into the equation and get:
q = (25.0 g)(4.184 J/g°C)(-50.0°C)
q = -5210 J
Therefore, the amount of heat released when 25.0 g of water is cooled from 80.0°C to 30.0°C is -5210 J.
A negative sign means the heat is absorbed during the cooling process, it is an endothermic process.
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what is the difference between sigma and pi bonds
In chemistry, a sigma bond (σ bond) is a chemical bond formed by the overlap of two atomic orbitals. On the other hand, a pi bond (π bond) is a chemical bond formed by the overlap of two p orbitals.
Sigma bonds are the strongest type of covalent bond, with a bond strength of about 280-350 kJ/mol. They are also the shortest bond, with an average length of about 0.15 nanometers (nm).
Sigma bonds are characterized by their short bond length and high bond energy. They are also directional, meaning that they are stronger in certain orientations than in others.
Pi bonds are weaker than sigma bonds, with a bond strength of about 70-100 kJ/mol. They are also longer than sigma bonds, with an average length of about 0.2nm.
Pi bonds are characterized by their longer bond length and lower bond energy compared to sigma bonds. They are also less directional than sigma bonds, meaning that they are relatively equally strong in all orientations.
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Covalent bonds has two types which are a sigma bond is a chemical bond formed by the overlap of two atomic orbitals and a pi bond (π bond) is a chemical bond formed by the overlap of two p orbitals.
What is a covalent bond?Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.
Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.
Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.
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First, once in the simulation, click on “solution values”. Move the blue levers (solute amount) and (solution volume) to the required amounts and find the molarity of the following:
1. Using Drink Mix mode:
a. What is the molarity when .772 moles are dissolved in .500 Liters of water?
b. What is the molarity when .453 moles are dissolved in .450 Liters of water?
The molarity when .772 moles are dissolved in .500 Liters of water is 0.0015M. The molarity when .453 moles are dissolved in .450 Liters of water is 0.001M.
What is molarity ?The term molarity is defined as the number of moles of solute dissolved in per litre of solution. The unit of molarity is mole, which is denoted by the symbol "M".
M = Number of moles of solute / litre in solution
1. Number of moles of solute = .772 moles
so, 0.772 / 500
= 0.0015 M
2. Number of moles of solute = .453 moles
so, .453 / 450
= 0.001 M
Thus, The molarity when .772 moles are dissolved in .500 Liters of water is 0.0015M. The molarity when .453 moles are dissolved in .450 Liters of water is 0.001M.
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How do you measure distance?
We measure distance by using a ruler to measure the distance between the two places.
Distance is defined as the amount of the space between the two place or the things.
Short distances can be measured in centimeters (cm), and the long distances may be measured in kilometers (km). SI unit of the distance is meter (m). Distance is the length of the route between the two points. For example: Distance of a race; it is the length of the track between the starting line and the finishing line.
Maps can also be used to measure the distance. The name of the scale is map's bar scale.
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write the oxidation number of the oxygen atoms in h2o2 and the oxidation number of the oxygen atoms in o2
the oxidation number of the oxygen atoms in h2o2 and the oxidation number of the oxygen atoms in o2 is -1 and 0
An atom's oxidation number (also known as oxidation state) in a chemical is an amount that represents the amount of electron density gained or lost by the atom during in the formation of the compound. In general, the oxidising number of an element in a compound can be determined using the following rules: n element's oxidising number is null whenever it is unrestricted (uncombined). The oxidation number of a polyatomic ion is equivalent towards the ion's charge. We can use these rules to calculate the oxidation number of the oxygen atoms in H2O2 and O2: In H2O2, the oxidation number of the oxygen atoms is -1. This is because the compound is neutral and the hydrogen atoms have an oxidation number of +1, so the oxygen atoms must have an oxidation number of -1 in order for the sum of all the oxidation numbers to be zero. In O2, the oxidation number of the oxygen atoms is 0. This is because the compound is a diatomic molecule and the oxidation number of the free element oxygen is 0.
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Use the drawing to help explain why gas pressure decreases when gas is removed from acontainer with a fixed volume
When gas is removed from a container with a fixed volume, the number of gas particles decreases, so there are fewer collisions and thus less pressure.
Additionally, the remaining gas particles have more space to move around, which also leads to a decrease in pressure. This can be visualized in the drawing by the decrease in the number of gas particles and the increased distance between them as gas is removed from the container.
As the gas particles decrease, there are fewer particles to collide with the walls of the container and therefore less force is exerted on the walls. This results in a decrease in the pressure inside the container.
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Which of these are involved in creating
new technologies?
A. engineering only
B. science only
C. math only
D. science, engineering, and math
diatomic elements are important. what makes them different from other elemental substances?
Diatomic elements are important because they make up a significant portion of the Earth's atmosphere and are crucial for many biological and chemical processes.
Diatomic elements are elements that exist in nature as molecules made up of two atoms of the same element, such as H2, O2, N2, and F2.
A diatomic atom is one that cannot exist on its own. There are no single O atoms floating around in the sky. Because O atoms must exist in pairs, oxygen occurs as O2. These atoms are too unstable to live on their own.
This elements are different from other elemental substances because they are composed of multiple atoms of the same element, rather than a single atom or a mixture of different elements.
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Which term is best described as an organic compound containing a carbonyl group bound to two hydrogen atoms or to a hydrogen atom and an alkyl substituent
A carbonyl group is bound to hydrogen bond or to a hydrogen ion and an alkoxy substituent in an organic compound known as an aldehyde.
What is Aldehyde?Aldehyde is an organic compound containing a functional group with the structure −CHO, in which a carbon atom is double-bonded to an oxygen atom and single-bonded to a hydrogen atom. Aldehydes are the simplest type of carbonyl group and the most common type of organic compound. Aldehydes are found in many natural and manufactured products, including perfumes and food products. The most common example of a natural aldehyde is formaldehyde, which is produced by plants and animals.
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