Answer:
A compound
Explanation:
A compound is a substance formed from the chemical combination of atoms of two or more elements together.
A chemical compound always contains the same kinds of atoms of elements combined together in as specific ratio by mass and can be represented by a chemical formula. For example, water is a compound formed from the chemical combination of hydrogen and oxygen atoms in the ratio of 2 : 1. It has a chemical formula H2O.
A pure compound also always have the same chemical properties irrespective of the source of the compound. For example, chemically pure has similar properties irrespective of whether it is obtained from rain, streams or underground wells.
Therefore, if a new material was produced in a laboratory by bonding atoms of different elements together in a unique arrangement and other laboratories were able to reproduce these results, producing the same material with the same elements in the same arrangement, then the substance must be a compound.
If the momentum of a car is reduced by half, assuming mass did not change, what must also have been reduced by half?
Answer:
Velocity is halved
Explanation:
Momentum is contingent on mass and velocity. The quantity of motion in a body is called the momentum of the body.
Momentum = mass x velocity
Now, if mass does not change and momentum is reduced by half, it suggests that the velocity was reduced by half.
Velocity is directly related to momentum.
Convert from 300 calories to calories (kicalories)?
Please help mee
Answer:
0.3 kicalories
Explanation:
300/1000
=0.3
PLS GIVE BRAINLIEST
Relate pH values of 9.1, 1.2, and 5.7 to hydronium and hydroxyl ion concentration.
Answer:
9.1 = basic 1.2= very acidic 5.7= acidic
Explanation:
Calculate how much Carbon Dioxide IN GRAMS needs to be absorbed to
release 500g of oxygen during photosynthesis.
Answer:
687.5 g of CO2
Explanation:
We'll begin by writing the balanced equation for photosynthesis. This is illustrated below:
6CO2 + 6H2O —> C6H12O6 + 6O2
Next, we shall determine the mass of CO2 absorbed and the mass of O2 released from the balanced equation. This is illustrated below:
Mass of CO2 = 12 + (2 × 16) = 12 + 32
= 44 g/mol
Mass of CO2 from the balanced equation = 6 × 44 = 264 g
Molar mass of O2 = 2 × 16 = 32 g/mol
Mass of O2 from the balanced equation = 6 × 32 = 192 g
Summary:
From the balanced equation above,
264 g of CO2 were absorbed to release 192 g of O2.
Finally, we shall determine the mass of CO2 absorbed to release 500 g of O2. This can be obtained as follow:
From the balanced equation above,
264 g of CO2 were absorbed to release 192 g of O2.
Therefore, Xg of CO2 will be absorbed to release 500 g of O2 i.e
Xg of CO2 = (264 × 500)/192
Xg of CO2 = 687.5 g
Thus, 687.5 g of CO2 will be absorbed to release 500 g of O2.
What is the physical and chemical properties of oxygen element??
Answer:
At standard temperature and pressure (STP), two atoms of the element bind to form dioxygen, a colorless, odorless, tasteless diatomic gas with the formula O2. Oxygen is a member of the chalcogen group on the periodic table and is a highly reactive nonmetallic element.
Answer:
Oxygen is a colorless, odorless, tasteless gas. It changes from a gas to a liquid at a temperature of -182.96°C (-297.33°F). The liquid formed has a slightly bluish color to it. Liquid oxygen can then be solidified or frozen at a temperature of -218.4°C (-361.2°F).
Explanation:
Addie mixes together a solution of 10 grams of
salt and 15 mL of hot water. What is the total
mass of the solution?
Answer: 150 grams
Explanation: m = V × ρ
= 15 milliliter × 10 gram/cubic centimeter
= 15 cubic centimeter × 10 gram/cubic centimeter
= 150 gram
Explain why the ionization energy to remove a second electron from potassium is higher than the ionization energy to remove four electrons from silicon.
Explanation:
It is more difficult to remove electrons from the second shell or energy level because of the imbalance between the positive nuclear charge and the remaining electrons.
The amount of energy required to remove electrons in ground state of an atom is the ionization energy. The first ionization energy is the energy needed to remove the most loosely bound electron of an atom in the gas phase in ground state. The second energy has a greater nuclear pull as it is closer to the nucleus. Both potassium and silicon have the same number of energy levels.Which situation provides the best evidence that a chemical reaction is taking place?
Answer: The following can indicate that a chemical change has taken place, although this evidence is not conclusive: Change of odor.
Explanation:
(02.05 LO
Which type of heat transfer takes place through electromagnetic waves? (3 points)
RADIATION ❤️
We know that radiation is defined as he transfer of heat energy by electromagnetic radiation.
Deshawn carefully mixes the substances together in an Erlenmeyer flask. When mixed together, the substances undergo a change. Afterward, Mimi measures the mass and finds it to be 10 grams. Mimi and Deshawn repeat this experiment twice more with the same results. What is the most likely explanation for this data?
I need help with it too
What will weigh more when a chemical change is complete? The reactants before the
chemical reaction, or the product after the reaction is complete?
A.The reactant will
weigh more than
the product
B. They both will loose
mass after the
reaction
C. They both will weigh
the same
D.The product always
weighs more than
the reactant
Plzzz Hurry!!!!! This is urgent
Answer:
I guessed and got c and got it right
Explanation:
When a chemical change is complete the reactants before the chemical reaction and the products after the chemical reaction will weigh the same.
Explanation:
The law of conservation of mass states that 'in a chemical reaction, mass can neither be created nor be destroyed.In accordance with this law, the total mass of reactants before the chemical reaction is equal to the total mass of the products after the chemical reaction.In chemical reaction mass of the reactants and products remains conserved.The number of atoms on the reactant side is always equal to the number of atoms on the product side.So, from this, we can conclude that when a chemical change is complete the reactants before the chemical reaction and the products after the chemical reaction will weigh the same.
Learn more about the 'law of conservation of mass' here:
brainly.com/question/14236219?referrer=searchResults
brainly.com/question/101125?referrer=searchResults
What is the correct formula that would result from the combination of the two ionic species?
if you could, also tell me why so I dont have to do this every time lol. If not that's cool too
Answer:
I think its B
Explanation:
I don't know how to explain it bc I'm not really sure
Part A
What volume (in mL ) of a 0.150 M HNO3 solution will completely react with 35.7 mL of a 0.108 M Na2CO3 solution according to the following balanced chemical equation?
In the reaction in Part A, what mass (in grams) of carbon dioxide forms?
Volume HNO₃ : 51.4 ml
Mass CO₂ : 0.17 g
Further explanationReaction
Na₂CO₃ + 2 HNO₃ ⇒ 2 NaNO₃ + CO₂ + H₂O
V Na₂CO₃ = 35.7 ml
M Na₂CO₃ = 0.108
mol Na₂CO₃ :
[tex]\tt 35.7\times 0.108=3.8556~mlmol[/tex]
mol ratio Na₂CO₃ : HNO₃ = 1 : 2
mol HNO₃ :
[tex]\tt \dfrac{2}{1}\times 3.8556=7.71~mlmol[/tex]
Volume HNO₃ :
[tex]\tt mol=n=M\times V\\\\V=\dfrac{n}{M}=\dfrac{7.71}{0.15}=51.4~ml[/tex]
mol CO₂ = mol Na₂CO₃ = 3.8556 mlmol=0.00386 mol
mass CO₂(MW=44 g/mol) :
[tex]\tt 0.00386\times 44=0.17~g[/tex]
how does science look at man
a group of the periodic table is called
Answer:
The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups.
Explanation:
In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. ... Groups may also be identified using their topmost element, or have a specific name. For example, group 16 is also described as the "oxygen group" and as the "chalcogens".
(hope this helps ^^)
how can alcohol content be increased
Answer:
Alcohol is a byproduct of the fermentation process, which takes place when the yeast converts the sugars derived from the grain. Knowing that, you can increase the alcohol by volume (ABV) by increasing the size of the grain bill or increasing the amount of malt extract used.
Why can we not use the Nitrogen that we breath in
Answer:
Nitrogen is an inert gas — meaning it doesn't chemically react with other gases — and it isn't toxic. But breathing pure nitrogen is deadly. That's because the gas displaces oxygen in the lungs. Unconsciousness can occur within one or two breaths, according to the U.S. Chemical Safety and Hazard Investigation Board.
Answer:
because it is an insert gas and it is very dangerous for ear and our nose
The density of red wine is 1.01g/cm3 and the density of olive oil is 0.92g/cm3.A salad dressing that consisted of these two ingredients was left sitting too long.The ingredients separated in the bottle ,which ingredient is which layer? Explain.
Answer:
The olive oil will be on top of the vinegar, this is because the density is more
Explanation:
since vinegar has a higher density than oil it will sink to the bottom of the bottle. subsequently oil will raise up. thus oil higher layer vinegar lower layer! :) . concentration in g/L....what u are given is 5.4g and 50ml
so first change the ml into L
50ml = 0.050L
now... 5.4g/0.050L = 108g/L
resolve in significant figures is 1.1 x 10^2 g/L
b. molarity = mol/L
L = 0.050 (calculated from above)
now we only have to convert the grams (5.4g) into mols
there are three elements in sucrose ( C = carbon, H = hydrogen
and O = oxygen)
look at the periodic table and find their molar mass (atomic weight)
Carbon = 12.0g/mol
Hydrogen = 1.00g/mol
Oxygen = 16.0g/mol
Sucrose contains 12 carbons, 22 hydrogens, and 11 oxygens
So the total molar mass of sucrose =
Carbon - 12 x 12.0 = 144
Hydrogen - 22 x 1.00 = 22
Oxygen - 11 x 16.0 = 176
Total = 144 + 22 + 176 = 342g/mol
Now u have 5.4grams of sucrose to change to mols u:
5.4 grams x 1 mol/ 342grams
in other words 5.4 grams / 342 grams leaving u with mols
= 0.0158 mols
now your concentration in molarity will be:
0.0158 mols / 0.050L = 0.32M (two significant figures)
and the unit is M which stands for mol/L
c. you are given 7M (aka mol/L)
you are given 100ml which equals 0.1L
7 mol/L x 0.1L = 0.7mol
all u have left to do is change the 0.7 mol back into grams
to do that we do the opposite of what we did in part b
in part b u took grams and changed it into mols
here we are taking mols and changing it back into grams
from part b we calculated the total molar mass = 342g/mol
so:
0.7 mol x 342 g/mol = 239.4grams
resolve into significant figures = 2 x 10^2 grams
How many moles of Cl2 are needed in order to produce 100.0 grams of FeCl3 given the following
equation: 2 Fe + 3 Cl2 → 2 FeCl3
B
T
Answer:
0.92moles
Explanation:
Given reaction:
2Fe + 3Cl₂ → 2FeCl₃
Mass of FeCl₃ = 100g
Unknown:
Number of moles of Cl₂ needed = ?
Solution:
To solve this problem, we work from the known specie to the unknown.
From the mass of the FeCl₃ given, we can solve for the number of moles of the unknown.
Number of moles of FeCl₃;Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of FeCl₃ = 56 + 3(35.5) = 162.5g/mol
Number of moles = [tex]\frac{100}{162.5}[/tex] = 0.62mole
From the reaction expression;
2 mole of FeCl₃ is produced from 3 moles of Cl₂
0.62 mole of FeCl₃ will be produced from [tex]\frac{0.62 x 3}{2}[/tex] = 0.92mole
The number of moles of Cl₂ = 0.92moles
Chemistry, please help
Answer:
yeap this substance can conduct electricity
why is 99 not a prime number
Explanation:
99 is not a prime number because it can be multiplied by itself and by other numbers
99*1
9*11
Answer:
A prime number is a number that can only be divisible by ±itself and ±1
but 99 can be divisible by ±3; ±11 => 99 isnt a prime number
Explanation:
12.
Contrast and compare:
a) ionic and covalent bonding
Answer:
Ionic bonds - an intramolecular force exist in a nonmetal and metal compounds such as NaCl. The Na donate 1 electon to Cl to complete its octet rule.
Covalent bond - an intramolecular force exist in a nonmetal and nonmetal compounds such as bonds O2, Cl2, CO2, sugar, proteins and most of organic compounds and biomolecules by sharing electrons to bond.
There are two types of covalent bonds: polar and nonpolar. Polar bond is a bond between two different nonmetal atoms of different electronegativities. While nonpolar bond is a bond between the same atom or two differenct atoms of the same electronegativities (if there is). Their electronegativities pull will cancel so that their overall polarity is zero.
Help please If there are 10 moles of HCl gas occupying 15L at 350°C, what is the pressure? Be sure to show the setup and
the final answer and unit.
Show Your Work
Answer:
P = 34.1 L
Explanation:
Given data:
Number of moles = 10 mol
Volume occupy = 15 L
Temperature = 350°C
Pressure of gas = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
350+273 = 623 K
by putting values,
P×15 L = 10 mol ×0.0821 atm.L/ mol.K ×623 K
P = 511.48atm.L/15L
P = 34.1 L
Whitney is making sweet tea. She adds 15 grams of
sugar to the 100 mL of tea. Once the sugar
dissolves, what is the mass of the sugar?
Answer:
the mass of the sugar would stay the same i think.
Explanation:
The electronegativity values of carbon, hydrogen, and nitrogen are compared in the table.
Comparison of
Electronegativity
Element Electronegativity
Carbon
2.5
Hydrogen 2.1
Nitrogen 3.0
Which of the following statements is true about the strength of the intermolecular forces in CH4 and NH3? (4 points)
Answer:
C. CH₄ is less than NH₃ because the NH bond is more polar than the CH bond
Explanation:
The intermolecular forces between ammonia is far stronger than for methane. Between the molecules of ammonia we have the presence of hydrogen bonds. This bond is absent in methane.
Hydrogen bonds are one of the strongest intermolecular forces. It is as a result of the electrostatic attraction between the hydrogen atom of one molecule and the electronegative atom N, O and F of another molecule.
This strong interaction is absent in methane which has just dipole - dipole attraction.The strength of the hydrogen bond depends on the electronegativity of the combining atoms.
When a hammer strikes a nail, the nail
Answer:
The nail will exert a force of equal strength in the opposite direction on the first object.
Explanation:
"According to Newton's third law of motion, when a hammer strikes and exerts force on a nail, the nail exerts a force of equal strength in the opposite direction on the first object."
Basically, if you push someone, they will fall over right?
Still, you will feel the force as you push them over, and you might stumble back while they are pinwheeling and falling into a pool.
That force is that torque when the person's weight is also pushing back at you while your force is pushing at them.
The image shows particles of salt dissolved in water.
How will the arrangement of salt particles most likely change?
Salt particles will move toward the left through diffusion.
Salt particles will move toward the left through active transport.
Salt particles will move toward the right through diffusion.
Salt particles will move toward the right through active transport.
Answer: Hope it may help you
Explanation:
Diffusion can be defined as the movement of particles from a region where there a more concentration of solute to the region having less concentration of the solute.
Here, the salt particles will move from right side of the box to the left side of the box.
This is because the right side has more particle and the left side has less particles so they will move towards the left side.
Answer:
A
Explanation:
Cavendish carried out a second experiment to test the properties of the hydrogen gas produced in the experiment. Was this experiment also a chemical reaction?
Answer:
Yes, this experiment is also an example of a chemical reaction. The original substance, hydrogen, disappeared, and a new substance, water, was formed.
Explanation:
Answer:
Yes, this experiment is also an example of a chemical reaction. The original substance, hydrogen, disappeared, and a new substance, water, was formed.
Explanation:
This was the answer straight from Plato. I hope that this helped you, please mark me the brainiest, like and rate my answer if it did! :)
1. What part of the human body has the same role as the processor on a computer?
2. What part of the human body has the same job as the wires and circuits in a computer?
Answer:
Starting from head to toe: A human brain is like a computer's central processing unit (CPU). In order for both the human body and computer to perform tasks, they need a brain or CPU. The brain and CPU communicate with other parts of the computer.Jan 27, 2011
Explanation:
1. What part of the human body has the same role as the power source in a computer?
2.What part of the human body has the same role as the keyboard or the mouse on a computer?
Answer:
1. The brain
2. MOUSE / KEYBOARD = HANDS
Explanation:
1.The CPU is like the brain of the body. The CPU controls the computer and is the most important part of a computer; similar to the way the brain controls the human body and is very important. Get it?
2.Both are input devices. They are used to send in instructions and information into and out of the computer.
Hope this helps!