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KSA Science '23

Last updated about 2 years ago

5 questions

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Question 1

1.

Which of these statements will help Jesse understand rust is actually a chemical reaction?

The reactants both must be in the same phase for a chemical reaction to occur. 

Rusting is a rapid process that can be observed while it is happening. 

Color change is a common indicator of chemical reactions.

Rust is not on the periodic table, so it is not a chemical.

Question 2

2.

Which one of these statements best explains why the rest of Jesse's family told Jesse his prediction can't be right?

When things rust, they fall apart.

Rusting gives off a gas that makes the rust heavier.

The rusting reaction doesn't remove a substance.

Chemical reactions always make things heavier.

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Question 4

4.

What one periodic pattern would most likely help Jesse predict the correct chemical formula for lithium + oxygen --> lithium oxide?

The location of the elements within their rows (period).

The location of the elements with their columns (group).

The atomic masses of these elements.

The number of neutrons these elements contain.

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Question 5

5.

Which one of these models best demonstrates the correct atomic configuration and electron transfer that occurs in the formation of iron (III) oxide?

Question 3

3.

Which statements describe why either Jake's or Paula's prediction could be correct, depending on whether the jar remains closed or open?

The mass of the jar will not change when the jar is closed.

The mass of the jar will not change when the jar is open.

The mass of the jar will increase when the jar is closed.

The mass of the jar will increase when the jar is open.

The mass of the jar will decrease when the jar is open.