WorksheetsUnit 2 Quiz
Total questions: 16
Worksheet time: 9mins
What makes a chemical equation balanced?
a. Equal numbers of molecules on each side
b. Equal numbers of each type of atom on both sides
c. Equal numbers of compounds on both sides
d. Equal numbers of coefficients on both sides
Which statement best describes the Law of Conservation of Mass?
a. Mass can be created or destroyed during chemical reactions
b. Mass is conserved only in physical changes
c. The total mass of reactants equals the total mass of products
d. Mass decreases during all chemical reactions
In a balanced chemical equation, what must be equal on both sides?
a. The number of molecules only
b. The total mass only
c. The number of atoms of each element
d. The number of subscripts
In the equation 2H2+O2→2H2O, how many oxygen atoms are on the reactant side?
1
2
3
4
Which equation is already balanced?
Na + Cl2 --> NaCl
2Na + Cl2 --> 2NaCl
Na + 2Cl --> NaCl
2Na + Cl --> 2NaCl
How many hydrogen atoms are in 3H2SO4 ?
3
4
6
12
The mineral albite is composed of four elements and has the chemical formula NaAlSi3O8. Which of these elements does albite contain?
A. Astatinte
B. Sulfur
C. Nitrogen
D. Aluminum
In the equation CaCO3→CaO+CO2, how many oxygen atoms are on the product side?
2
3
4
5
What does a coefficient in front of a chemical formula indicate?
a. The atomic number of the elements
b. The number of atoms in the molecule
c. The number of molecules or formula units
d. The charge of the compound
Which equation represents a balanced chemical reaction?
Cu + O2 --> CuO
2Cu + O2 --> 2CuO
Cu + O2 --> Cu2O
Cu + O --> 2CuO
The picture shows zinc (Zn) reacting with Hydrochloric acid (HCl) in a test tube. Which of the following properly classify Zinc & Hydrochloric acid before the reaction took place?
Zinc is a compound and Hydrochloric acid is an element. Both are pure substances
Zinc is an element and Hydrochloric acid is an compound. Both are pure substances.
Zinc and Hydrochloric acid are both compounds. Both are mixtures.
Zinc and Hydrochloric acid are both elements. Zinc is a pure substance and Hydrochloric acid is a mixture.
The test tube with the silver colored liquid is filled with mercury. Mercury atoms are more attracted to each other than to the glass of the test tub
Mercury is considered a ______________ substance.
adhesive
cohesive
superadhesive
neither cohesive or adhesive
Which of the following statements are true about the chemical formula listed below?
HClO3
Select 2 Answers!!!
A. There are 3 elements in the formula.
B. There are 4 elements in the formula.
C. There are 6 total atoms in the formula.
D. There are 3 total atoms in the formula.
E. There are 5 total atoms in the formula.
Silver Nitrate, AgNO3, is a chemical compound used in experiments. How does the subscript affect the number of atoms in the formula?
The subscript applies to all element totals, so the total number of atoms in this molecule equals 9.
The subscript applies to the Nitrogen and the Oxygen making the total number of atoms in this formula equal 6.
The subscript applies only to the Oxygen making the total number of atoms in this formula equal to 5.
Subscripts only affect the formula if they are attached to the end , so the total number of atoms in this formula is 9
6CO2 + 6H2O → C6H12O6 + 6O2
carbon dioxide + water → glucose + oxygen
The Reactants in the above equation are ________ and _______.
Write the names not the chemical formulas.
(a)
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence
chemical reaction occurs when coal burns?
A. The shape of the coal changes.
B. Oxygen is present.
C. A new substance is produced.
D. Coal is made up of more than one element.
