Answer:
2 1 4 3
Explanation:
Polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. Therefore the order of solubility is calcium bromide> calcium chloride>calcium bicarbonate>calcium carbonate.
What is solubility?Solubility shows the extent of solubility of a solute in solvent to make a solution. Solute is substances that is present in small amount. solvent is a substance that is present in large amount. Its SI unit is gram per liter or g/L.
Bond strength affect the solubility of a solute in solvent. weaker the bond strength is, more the solubility is. The weaker bond can be easily broken by water molecule
Calcium bromide is more soluble than calcium chloride as the bond strength in calcium bromide is weaker than calcium chloride. Calcium bicarbonate is more soluble than calcium carbonate.
Therefore the order of solubility is calcium bromide> calcium chloride>calcium bicarbonate>calcium carbonate.
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Which statement applies only to electric force insted of electric and magnetic forces
Answer:
If the options are
A. It can push objects apart
B. It can pull objects together
C. It acts between charged particles
D. It acts between objects that do not touch
I'm pretty sure it would be C.
Sry if wrong but have nice day! <3
A sample of wood occupies a space of 200 mL and has a mass of 75 g. What is the density?
Answer:
0.375 g/mL
Explanation:
Given data:
Volume occupy by wood = 200 mL
Mass of wood = 75 g
Density of wood = ?
Solution:
Formula:
d = m/v
by putting values,
d = 75 g/ 200 mL
d = 0.375 g/mL
write the cations and anions present in NaCl
which of the following is an example of a model?
Answer:
U
Explanation:
UUUUUUUUUUUUUU
If an ion gains one or more electrons, it becomes a
Answer:a negative charge
Explanation:
while an atom that gains electrons and becomes negatively charged is known as an anion.
After pollen grows on a tube down the style,___
Answer:
as soon as the pollen reaches the stigma after the pollen grain descends down the style when the pollen tube grows into the ovule when the seed germinates
Explanation:
Choose all the answers that apply.
Plants in the desert _____.
have waxy leaves and stems
produce seeds quickly
don't need any water
lose their leaves in winter
Answer: They Have Waxy Leaves And Stems
Explanation:
:)
Answer:
have waxy leaves and stems
&
produce seeds quickly
Hope this helps good luck :)
Which is more electrically negative? 1)C 2)P or 3)S
GUYS PLEASE HELP!!! :((
Answer:
3 sulphur is more electrically –
Composition of matter (compound, mixture, element)
Explanation:
Matter can be classified into two broad categories: pure substances and mixtures. ... A material composed of two or more substances is a mixture. Elements and compounds are both examples of pure substances. A substance that cannot be broken down into chemically simpler components is an elementOne useful way of organizing our understanding of matter is to think of a hierarchy that extends down from the most general and complex to the simplest and most fundamental (Figure 3.4.1 ). Matter can be classified into two broad categories: pure substances and mixtures. A pure substance is a form of matter that has a constant composition (meaning that it is the same everywhere) and properties that are constant throughout the sample (meaning that there is only one set of properties such as melting point, color, boiling point, etc. throughout the matter). A material composed of two or more substances is a mixture. Elements and compounds are both examples of pure substances. A substance that cannot be broken down into chemically simpler components is an element. Aluminum, which is used in soda cans, is an element. A substance that can be broken down into chemically simpler components (because it has more than one element) is a compound. For example, water is a compound composed of the elements hydrogen and oxygen. Today, there are about 118 elements in the known universe. In contrast, scientists have identified tens of millions of different compounds to date.
An element is a substance which can be split into simpler unit by ordinary chemical prcess.
Compound this is a pure substance that is composed of two or more element in a fixed and definite portion.
Mixture contains two or more constituents which can be easily separated by physical method.
Please help me! It would be amazinggg if you CANNN!!
Answer:
it is number 2
Explanation:
hope this helps it is number 11
If the pressure of a 2.00 L sample of gas is 50.0 kPa, what pressure does the gas exert if its volume is decreased to 20.0 mL?
Which equation should you use?
use B.
✔ 5000
kPa
Answer:
P₂ = 5000 KPa
Explanation:
Given data:
Initial volume = 2.00 L
Initial pressure = 50.0 KPa
Final volume = 20.0 mL (20/1000=0.02 L)
Final pressure = ?
Solution:
The given problem will be solved through the Boly's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
50.0 KPa × 2.00L = P₂ × 0.02 L
P₂ = 100 KPa. L/0.02 L
P₂ = 5000 KPa
Technetium-104 has a half-life of 18.0 minutes. How much of a 165.0 g sample remains after 36.0 minutes?
Answer:
41.25g
Explanation:
Given parameters:
Half-life of Technetium - 104 = 18minutes
Mass = 165g
Unknown:
Mass of sample remaining after 36minutes = ?
Solution:
The half-life of a radioactive element is the time taken for half of the element to decay;
Now;
Start First half life Second half-life
Time 0 18min 36min
Mass 165g 82.5g 41.25g
A 2.80 g sample of Al reacts with 4.15 g sample of Cl2 according to the equation shown below.
2Al + 3Cl2 2AlCl3
What is the theoretical yield of AlCl3 in this reaction?
Answer:
Mass = 5.33 g
Explanation:
Given data:
Mass of Al = 2.80 g
Mass of Cl₂ = 4.15 g
Theoretical yield of AlCl₃ = ?
Solution:
Chemical equation:
2Al + 3Cl₂ → 2AlCl₃
Number of moles of Al:
Number of moles = mass/molar mass
Number of moles = 2.80 g/ 27 g/mol
Number of moles = 0.10 mol
Number of moles of Cl₂:
Number of moles = mass/molar mass
Number of moles = 4.15 g/71 g/mol
Number of moles = 0.06 mol
Now we will compare the moles of AlCl₃ with Al and Cl₂.
Cl₂ : AlCl₃
3 : 2
0.06 : 2/3×0.06 = 0.04
Al : AlCl₃
2 : 2
0.10 : 0.10
Number of moles of AlCl₃ produced by chlorine are less so it will be limiting reactant.
Mass of AlCl₃:Theoretical yield
Mass = number of moles ×molar mass
Mass = 0.04 mol × 133.34 g/mol
Mass = 5.33 g
5.33 grams is the theoretical yield of AlCl₃ in this reaction.
What is theoretical yield?Theoretical yield of any reaction tells about the accurate quantity of the product formed by the complete consumption of reactants.
Given chemical reaction is:
2Al + 3Cl₂ → 2AlCl₃
First we convert the mass of reactants into moles by using the formulas:
n = W/M, where
W = given mass
M = molar mass
Given mass of Al = 2.80 g
Moles of Al = 2.80/27 = 0.10 mole
Given mass of Cl₂ = 4.15 g
Moles of Cl₂ = 4.15/71 = 0.06 mole
From this calculation we conclude that Cl₂ is the limiting reagent, so the formation of product depends on Cl₂.
From the stoichiometry of the reaction, it is clear that:
3 moles of Cl₂ = produce 2 moles of AlCl₃
0.06 moles of Cl₂ = produce 2/3×0.06 = 0.04 moles of AlCl₃
Now we calculate the produced mass of AlCl₃ as:
W = 0.04mol × 133.34g/mol = 5.33g
Hence, 5.33g is the produced theoretical yield.
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How many molecules/atoms of excess reactant will remain after the reaction is complete?
Answer:
Once you have identified the limiting reactant, you calculate how much of the other reactant it must have reacted with and subtract from the original amount.
Explanation:
1. Write the chemical equation.
2.Calculate the moles of product from the first reactant.
3.Calculate the moles of product from the second reactant.
4.Identify the limiting reactant and the excess reactant.
5.Calculate the mass of excess reactant used up.
6.Calculate the mass of unused excess reactant.
7.Calculate the mass of limiting reactant needed to react with the unused excess reactant.
Since the replication crisis, many practices have been implemented to improve research and promote –, or the practice of sharing data and materials so they can be reviewed and replicated by other researchers. One of these practices involves submitting the proposed methods and analysis plan to journals in advance for approval or –. This practice allows scientific journals to approve experiments before they are done, with the guarantee that any finding will be published regardless of whether or not it is significant. This process also prevents researchers from –, or creating theories or hypotheses that explain the results of a study after the data has been collected.
Answer:
Since the replication crisis, many practices have been implemented to improve research and promote open science, or the practice of sharing data and materials so they can be reviewed and replicated by other researchers. One of these practices involves submitting the proposed methods and analysis plan to journals in advance for approval or preregistration. This practice allows scientific journals to approve experiments before they are done, with the guarantee that any finding will be published regardless of whether or not it is significant. This process also prevents researchers from harking, or creating theories or hypotheses that explain the results of a study after the data has been collected.
Explanation:
The blanks in the text above were filled with the terms that best fit the context and meaning of the message that the text, in general, wanted to convey. No grammatical element and no punctuation has been modified, which allows the text to maintain its original coherence and meaning.
The added terms are in agreement with the scientific denominations currently accepted.
A newspaper article about the danger of global warming from the accumulation of greenhouse gases such as carbon dioxide states that "reducing driving your car by 20 miles a week would prevent release of over 1000 pounds of CO2 per year into the atmosphere." Is this a reasonable statement? Assume that gasoline is octane (molecular formula is C8H18) and that it is burned completely to CO2 and H2O in the engine of your car. Facts (or reasonable guesses) about your car's gas mileage, the density of octane, and other factors will also be needed.
Answer:
The newspaper article's statement is correct since the mass of CO₂ reduced = 1071.85 pounds
Explanation:
Equation for the combustion of gasoline (octane) is given below:
2C₈H₁₈ + 25O₂ ----> 16CO₂ + 18H₂O
Density of C₈H₁₈ = 0.8 g/mL
Assuming mileage of the car is 20 miles/gallon; 1 gallon = 3.785 L
Since 20 miles is reduced in driving each week, thereby saving 1 gallon of gasoline, number of litres of gasoline reduced in a year is given by;
52 * 3.785 L = 196.82 L = 196820 mL
density = mass/volume; mass = density * volume
mass of gasoline saved = 0.8 g/mL * 196820 mL = 157456 g
number of moles = mass/molar mass
Molar mass of C₈H₁₈ = 114 g/mol
number of moles of C₈H₁₈ in 157456 g = 157456 g / 114 g/mol = 1381.2 moles
From the equation of reaction, 2 moles of C₈H₁₈ produces 16 moles of CO₂
1381.2 moles of C₈H₁₈ will produce 1381.2 * 16/2 moles of CO₂ = 11049.6 moles of CO₂
mass = number of moles * molar mass
molar mass of CO₂ = 44 g/mol
mass of CO₂ = 11049.6 moles * 44 g/mol = 486182.4 g
1 g = 0.00220462 pounds
Therefore mass of CO₂ reduced = 486182.4 g * 0.00220462 lb/g
mass of CO₂ reduced = 1071.85 pounds
Therefore, the newspaper article's statement is correct
is oxygen a necessary reactant for oxidation reaction
Answer:
Oxidation: A process in which an atom loses an electron and therefore increases its oxidation number. ... So oxidation reactions need not involve oxygen. This redox reaction is actually the sum of two separate half-reactions (a reduction half-reaction and an oxidation half-reaction).
Explanation:
Hope this helped!
Oxygen is not a necessary reactant for oxidation reaction.
In chemistry oxidation is called the chemical phenomenon in which an atom, molecule or ion loses one or more electrons, thus increasing its positive charge.
As oxygen is an element that usually accepts these electrons, this type of reaction was called oxidation reactions.
The element that grants the electrons is known as the reducing agent and it is the one that oxidizes.The oxidizing agent, on the other hand, stays with the electrons that the reducing agent releases.Most cases of oxidation involve oxygen, but it can also occur in its absence.Several substances are capable of oxidizing many chemical compounds, with the same and even greater ease than the oxygen [O2]; an example: ozone [O3].Ozone is a toxic agent as a consequence of its strong oxidizing power and is produced in cities by the action of sunlight on nitrogen dioxide, [NO2].Therefore, we can conclude that oxygen is not a necessary reactant for oxidation reaction.
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How is the pH of an acidic substance raised?
1) Dilute it.
2) freeze it.
3) Stir it.
4) Concentrate it.
Answer: 4) Concentrate it
Explanation:
Examine the chemical reaction. What coefficient of O2 should be added so the number of atoms of oxygen is conserved on both sides of the reaction equation? 3 5 7 10
Answer:
5
Explanation:
The correct coefficient of oxygen is 5.
The question is incomplete, the complete question is;
Examine the chemical reaction C3H8 + O2----> 4H2O + 3CO2. What coefficient of O2 should be added so the number of atoms of oxygen is conserved on both sides of the reaction equation?
A: 3
B: 5
C: 7
D: 10
The principle of balancing chemical reaction equation is that the number of atoms of each element at the right hand side of the reaction equation must be equal to the number of atoms of the same element at the left hand side of the reaction equation.
Given the reaction; C3H8 + O2----> 4H2O + 3CO2, it will only become balanced when the coefficient of O2 is 5.
Hence, we can write; C3H8 + 5O2----> 4H2O + 3CO2
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The force of attraction between one polar molecule and another polar molecule is
Answer:
Dipole-dipole forces
Explanation:
A polar compound is that compound which contains atoms that have a difference in charges i.e electrostatic attraction occurs between its constituent atoms. Polar molecules are attracted to other polar molecules with opposite charges and her held together with the aid of certain forces
The attractive force between the negative part of a polar molecule (-) and the positive part of another polar molecule (+) is called DIPOLE-DIPOLE FORCES. This dipole-dipole force gets stronger with an increasing polarity of the molecules involved.
Which is the outmost layer of the atmosphere
Answer: Exosphere
Explanation: Exosphere. This is the outermost layer of the atmosphere. It extends from the top of the thermosphere to 6,200 miles (10,000 km ) above the earth.
the exosphere is the outermost layer of the atmosphere
A metal atom and a non-metal atom bond together. What type of bond do they form?
Question 8 options:
Ionic
Round
Covalent
Glue
Answer: Iconic
Explanation:Ionic bonds are formed through the exchange of valence electrons between atoms, typically a metal and a nonmetal.
C-12 is an isotope of Carbon; what is its atomic number and its atomic mass number?
Answer:
Explanation:
Given isotope;
C - 12
Unknown:
Atomic number = ?
Atomic mass = ?
Solution:
Isotopes of an element have the same electronic configuration but only differ in their masses. They have the same atomic number but different mass numbers due to the differences in the number of neutrons in their various nuclei.
For carbon; atomic number = 6
Atomic mass of this isotope = 12
The atomic number is the number of protons
Atomic mass is the number of protons and neutrons
Using the following thermochemical equation, calculate how much heat is associated with the decomposition of 4.00 moles of NH4Cl.
NH3(g) + HCl(g) è NH4Cl(s) ΔH = -176 kJ
A) 5000
B) 740
C) 407
D) 704
Answer:
D
Explanation:
[tex]4 \times - 176 = - 704[/tex]
Answer:
D - 704
Explanation:
The balanced thermochemical equation relates the energy change to moles, not grams, so we first convert the amount of NH4Ck to moles and then use the thermochemical equation to determine the energy change:
4.00 mole NH4Cl x (-176 ÷ 1 mole NH4Cl)
= -704
State the number of degrees of longitude that separates New York City from Denver, Colorado between these two cities.
Answer:
The number of degrees of longitude that separates New York City from Denver, Colorado is 30.9843 degrees longitude
Explanation:
The longitude of New York City is 74.0060° W
The latitude of New York City is 40.7128° N
The longitude of Denver, Colorado is 104.9903°W
The latitude of Denver Colorado is 39.7392°N
Therefore, the difference the number of degrees of longitude that separates New York City from Denver, Colorado is 104.9903 - 74.0060 = 30.9843°.
1. Find the number of protons, neutrons, electrons and electronic structure of flourine 919F.
2. Write the chemical formula of following compound.
Magnesium hydroxide
3. Balance the following equation
_H2 + _O2 --------> __H2O
1. ₉¹⁹F
2. Mg(OH)₂
3. 2H₂ + O₂ ⇒ 2H₂O
Further explanation1. Fluorine, atomic number : 9 , mass number = 19
Symbol : ₉¹⁹F
protons=electrons=atomic number = 9
neutrons = mass number - atomic mass
[tex]\tt n=19-9=10[/tex]
Configuration : [He] 2s² 2p⁵
2. Magnesium hydroxide is an ionic compound and is a strong base consisting of 2 ions:
Positive ion: Magnesium: Mg²⁺
negative ion: Hydroxide: OH⁻
The charges of the two are crossed, so that the compound becomes:
Mg(OH)₂
3. Reaction :
H₂ + O₂ --------> H₂O
give coefficient :
aH₂ + bO₂ --------> H₂O
H, left = 2a, right 2⇒2a=2⇒a=1
O, left = 2b, right 1⇒2b=1⇒b=0.5
Reaction becomes :
H₂ + 0.5O₂ --------> H₂O x 2
2H₂ + O₂ --------> 2H₂O
PLEASE HELP ME !
Electromagnetic waves will travel the SAME SPEED (speed of light) WITHIN a medium as it does WITHOUT a medium. Question 4 options: True False
Answer:
False
Explanation:
Emectromagnetic waves are slowed down by even the most transparent of mediums.
Which type of stress causes fault-block mountains?
Which element is likely to be the best conductor of electricity?
Answer:
silver
Explanation:
The most electrically conductive element is silver, followed by copper and gold. Silver also has the highest thermal conductivity of any element and the highest light reflectance.
Answer:
A. copper
Explanation:
edge 2021
Sulfur dioxide is an atmospheric pollutant.
Sulfur dioxide pollution is reduced by reacting calcium oxide with sulfur dioxide to
produce calcium sulfite.
CaO + SO2 → CaSO3
7.00 g of calcium oxide reacts with an excess of sulfur dioxide.
Relative atomic masses (Ar): O = 16 S = 32 Ca = 40 Calculate the mass of calcium sulfite produced
The mass of calcium sulfite produced : 15 g
Further explanationA reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction
CaO + SO₂ → CaSO₃
mol CaO (MW=56 g/mol)
[tex]\tt \dfrac{7}{56}=0.125[/tex]
Because sulfur dioxide is an excess, so mol CaSO₃ based on mol CaO
From the equation, mol ratio of mol CaSO₃ : mol CaO=1 : 1, so mol CaSO₃ :
[tex]\tt \dfrac{1}{1}\times 0.125=0.125[/tex]
mass CaSO₃ (MW=120 g/mol) :
[tex]\tt 0.125\times 120=15~g[/tex]