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WorksheetsUnit B Retake Study Questions
Total questions: 40
Worksheet time: 20mins
Name
Class
Date
1.
Which of the following illustrates the conservation of mass?
a)
CH4 + O2 --> CO2 + H2O
b)
2H2 + O2 --> 2H2O
c)
H2 + Cl2 --> HCl
d)
Fe + O2 --> Fe2O3
2.
A banana was left on the counter for a week. Which evidence suggests that a chemical reaction occurred?
a)
The banana's temperature remained the same.
b)
The banana began to turn brown.
c)
The banana had a sweet taste.
d)
The banana looked exactly the same.
3.
Copper reacts with chlorine to form copper chloride. Which statement about copper chloride is most accurate?
a)
Its properties are identical to copper and chlorine.
b)
Its properties are similar to chlorine but different than copper.
c)
Its properties are similar to copper but different than chlorine.
d)
Its properties are different than copper and chlorine.
4.
When a chemical reaction takes place, whata is most likely released or absorbed?
a)
Heat
b)
Electricity
c)
Temperature
d)
Wind
5.
Twenty milliliters (mL) of copper chloride (CuCl) was combined with sodium carbonate (Na2CO3 ) solution. As the liquid was stirred, brownish-red solid particles began to form. Analysis of the particles showed that they were copper. What evidence suggests that a chemical reaction occurred?
a)
The liquid remained at room temperature.
b)
A precipitate formed in the solution.
c)
Some of the liquid evaporated.
d)
The mixture of liquids remained clear.
6.
What evidence is the best evidence that a chemical reaction occurred?
a)
The volume of the resulting liquid changed.
b)
A liquid begins to evaporate.
c)
A precipitate forms.
d)
The shape of a solid changes.
7.
Which of the following best describes the Law of Conservation of Mass?
a)
Matter (mass) is destroyed after a chemical reaction takes place.
b)
Matter (mass) is created after a chemical reaction takes place.
c)
Matter (mass) always remains the same before and after a chemical reaction takes place.
8.
How many different elements are in Sulphuric Acid?
a)
1
b)
2
c)
3
d)
4
9.
How many different elements are in Ammonia?
a)
1
b)
2
c)
3
d)
4
10.
How many different elements are in Soda Ash?
a)
1
b)
2
c)
3
d)
4
11.
How many different elements are in Sodium Bicarbonate?
a)
1
b)
2
c)
3
d)
4
12.
Which of the following involves a chemical reaction?
a)
Burning wood
b)
Scratching Glass
c)
Tearing Paper
d)
Boiling Water
13.
Which of the following involves a chemical reaction?
a)
Melting Butter
b)
Making Kool-Aid
c)
Metal Corroding
d)
Making an ice cube
14.
This equation shows the chemical reaction between hydrogen and oxygen: 2H2 + O2 --> 2H2O. What shows that mass is conserved in this reaction?
a)
The elements that make up the reactants also make up the products.
b)
There is the same number of each type of atom on the product side as there is on the reactant side of the equation.
c)
The total number of atoms on the reactant side of the equation is equal to the total number of atoms on the product side of the equation.
d)
Chlorine is present on both sides of the reaction
15.
How many different atoms are represented by this chemical formula? Na2CO3
a)
1
1
1
b)
2
c)
3
d)
6
16.
How many different atoms are represented by this chemical formula? NaOH
a)
1
b)
2
c)
3
d)
4
17.
Which chemical reaction best illustrates the law of conservation of mass?
a)
2H2 + O2 --> 2H2O
b)
H2 + O2 --> H2O
c)
H2 + O2 --> 2H2O
d)
H + 2O --> H2O
18.
A materials scientist wants to make a silly putty that is less flexible and does not easily stretch. How could she chemically change its physical structure to achieve his goal?
a)
Add single monomers.
b)
Break and remove cross-links between the polymers.
c)
Add more cross-links between the polymers.
19.
_________ are positively charged and are the same number as a given atom's atomic number.
a)
Atoms
b)
Protons
c)
Electrons
d)
Neutrons
20.
_________ are negatively charged particles found in energy levels outside of the nucleus of an atom.
a)
Molecules
b)
Protons
c)
Electrons
d)
Neutrons
21.
_________ have no change and help make-up the nucleus of an atom.
a)
Molecules
b)
Protons
c)
Electrons
d)
Neutrons
22.
he properties of a molecule will always be very similar to the atoms that make them up.
a)
True
b)
False
23.
Atoms of the same element, regardless of charge, always have the same number of:
a)
Electrons
b)
Neutrons
c)
Protons
24.
What tyle and form of energy is stored in the bonds between atoms?
a)
Chemical Potential
b)
Kinetic Electrical
c)
Potential Gravitational
d)
Kinetic Sound
25.
Elements with an incomplete outermost energy level will be chemically reactive.
a)
True
b)
False
26.
Sulfur is located below Oxygen on the periodic table. What is true about Sulfur?
a)
It will have the same atomic mass as oxygen.
b)
It will have a smaller atomic number than oxygen.
c)
It will have a different number of bonds to hydrogen than oxygen.
d)
It will have the same number of bonds to hydrogen as oxygen.
27.
In the manufacturing process of circuit boards, used copper chloride solution is a product of the process used to etch circuit boards. What is NOT true about copper chloride?
a)
It is very toxic and hazardous to a person's health.
b)
It is produced through a chemical reaction.
c)
It can be reused after using a chemical process to remove the copper.
d)
It can be completely destroyed.
28.
During a chemical reaction...
a)
Atoms are created.
b)
Atoms are destroyed.
c)
Atoms are rearranged.
29.
Which of the following observations are chemical properties of a substance?
a)
The substance conducts electricity.
b)
The substance reacts with hydrochloric acid.
c)
The substance is very dense.
d)
The substance boils at 100 degrees.
30.
If the demand for a new drink container decreased (went down), which of the following statements would be TRUE about the other stages of life?
a)
There would be more waste produced.
b)
There would be less energy used to produce drink containers.
c)
There would be more raw materials taken from the earth.
31.
Atoms of elements in the same family all have:
a)
The same element symbol.
b)
The same atomic number.
c)
The same number of electrons in their outermost energy level (valence electrons).
32.
As long as you dilute waste enough so that you can't see it in the solution, it is safe to pour down the drain.
a)
True
b)
False
33.
Parts per million is a way of expressing the ______________ of a solution.
a)
Concentration
b)
Temperature
c)
Volume
d)
Density
34.
Anything that has mass and takes up space.
a)
Mass
b)
Volume
c)
Matter
35.
When two or more elements join together chemically...
a)
An atom forms.
b)
A compound forms.
c)
A mixture forms.
d)
A proton forms.
36.
Which of the following is a compound?
a)
Na
b)
C
c)
Co
d)
CO
37.
This model can best be described as a(n):
a)
Atom
b)
Mixture
c)
Compound
d)
Molecule
38.
This model can best be described as a(n):
a)
Atom
b)
Mixture
c)
Compound
d)
Molecule
39.
According to the periodic table of elements, which of the following is TRUE?
a)
Lithium is a nonmetal.
b)
Krypton is a gas.
c)
Mercury is a solid.
d)
Hydrogen's atomic number is 2.
40.
According to the periodic table of elements, which of the following is TRUE?
a)
Helium is a metal.
b)
Chlorine is a member of the alkaline earth metals family.
c)
Sodium is a member of the alkali metals family.
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