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REVIEW J.U3L2-Chemical Equations
Test Description: Quiz prep
Instructions: Answer all questions to get your test result.
1) During photosynthesis, water and carbon dioxide react to form oxygen and glucose. Is it a valid CLAIM that the products differ from the reactants of photosynthesis? Y or N
A
NO, products and reactants are the same, but with different numbers only
B
YES, products differ from reactants in all chemical reactions
C
It's a trick question
D
No idea
2) When paper is burned, the mass of the remaining ash is less than the mass of the original paper. What is your CLAIM?
A
The ash has less volume than the paper.
B
Some of the matter is destroyed during the reaction.
C
Some of the products of the reaction were given off as a gas.
D
The mass of the ash cannot be accurately determined.
3) The metal sodium (Na) and the gas chlorine (Cl2) react to form sodium chloride, known as table salt (NaCl). Why are the products different from the reactants?
A
atoms that make up the original substances are regrouped into different molecules with different properties
B
it's silly to think that chlorine gas combines with a metal to make table salt
C
in chemistry, energy can be destroyed
D
no, the products are not always different from the reactants
4) 2C2H6 + 7O2 produces 4CO2 + 6H2O. Which substance is a product in this reaction?
A
oxygen (O2)
B
carbon (C)
C
ethane (C2H6)
D
water (H2O)
5) Solid magnesium, Mg, reacts with oxygen gas, O2, to form the solid magnesium oxide, MgO. Which is a balanced chemical equation?
A
Mg + O2 produces MgO2
B
Mg + 2O produces 2MgO
C
Mg + O produces MgO
D
2Mg + O2 produces 2MgO
6) The chemical formula for hydrogen peroxide is H2O2. Explain what the letters and numbers in the chemical formula represent.
A
H represents happiness. O represents oxygen. The 2s indicate there are two atoms of happiness and two atoms of oxygen.
B
H represents hydrogen. O represents overjoy. The 2s indicate there are two atoms of hydrogen and two atoms of overjoy.
C
H represents hydrogen. O represents oxygen. The 2s indicate there are two atoms of hydrogen and two atoms of oxygen.
D
H represents home. O represents oven. The 2s indicate there are two atoms of home and two atoms of oven
7) When coal is burned, sulfur is released into the air, where it reacts with oxygen to produce sulfur dioxide and sulfur trioxide. Your CLAIM?
A
Sulfur dioxide and sulfur trioxide are the reactants in this change.
B
The products contain more sulfur atoms and fewer oxygen atoms than the reactants.
C
The products have different chemical properties than those of the reactants.
D
The identity of each reactant remains the same.
8) Which number completes the balanced chemical equation showing the process of rusting? 4Fe + 3O2 produces ____Fe2O3
A
2
B
4
C
1
D
12
9) 3NaOH + H3PO4 produces Na3PO4 + 3H2O. Your CLAIM?
A
Na3PO4 is a product
B
MgO is a reactant
C
H3PO4 shows that three atoms of oxygen are involved in the reaction.
D
A total of five oxygen atoms are involved in the reaction.
10) Pb(NO3)2 + 2NaI produces PbI2 + 2NaNO3. Your CLAIM?
A
Because Mg and O2 are both elements, no bonds were broken during the formation of MgO.
B
Mass is lost when 2Mg and O2 become 2MgO.
C
The chemical properties of Pb(NO3)2 and NaI differ from the chemical properties of PbI2 and NaNO3.
D
The chemical properties of NaOH and Na3PO4 are similar, and the chemical properties of H3PO4 and H2O are similar.
*select an answer for all questions
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