Describing Chemical Reactions
Authored by Helen Ajtun
Science
7th Grade
NGSS covered
Used 75+ times
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16 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The expression CaCO3 → CaO + CO2 is an example of a
reactant.
product.
chemical equation.
chemical progression.
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the number “4” in SiCl4?
a subscript
a coefficient
a product
a reactant
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The product side of a chemical reaction is shown.
→ 7Ti2(SO4)3
Which number represents a coefficient?
2
3
4
7
4.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
What can the arrow in a chemical reaction be translated to mean? Check all that apply.
yields
accompanied by
react to form
added to
except
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Cecil writes the equation for the reaction of hydrogen and oxygen below.
H2 + O2 → H2O
Why does his teacher ask him to balance the equation by including the correct coefficients?
to show that most molecules exist in pairs
to show that most compounds exist in pairs
to show that atoms are conserved in chemical reactions
to show that atoms are created in chemical reactions
Tags
NGSS.MS-PS1-5
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Franklin was performing an experiment by combining hydrochloric acid and sodium hydroxide. He measured the mass of his reactant materials to be 35g. The reaction resulted in the production of salt and water. He reported that his products weighed 32g.
Which best describes the results of Franklin’s experiment?
No error occurred, some of the products are always lost as heat.
An error occurred, the mass of the reactants should equal the mass of the products.
An error occurred, the products should weigh more than the reactants.
No error occurred, water is not weighed when determining the weight of the products.
Tags
NGSS.MS-PS1-5
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Rust results from iron’s reaction to oxygen. An iron nail gains mass when it rusts. How does this reaction support the law of conservation of mass?
The mass of the rusted nail equals the mass of iron and the oxygen from the air it reacted with to form the rust.
The mass of the rusted nail increases because iron attracts more protons from the air.
The increased mass of the rusted nail is an exception to the law of conservation of mass since the rusted nail’s mass increases.
The increased mass of the rusted nail results from the rearrangement of protons and neutrons within oxygen, according to the law of conservation of mass.
Tags
NGSS.MS-PS1-5
NGSS.MS-PS1-2
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