Quiz about Chemical Reactions

Question 1

Will the properties of the two samples likely be the same or different?

Accepted Answer

Different because the repeating groups of atoms that make up each sample are different.

Answer

Different because there are more repeating groups of atoms in Sample 1.

Answer

The same because the repeating groups of atoms that make up the two samples have the same number of atoms.

Answer

The same because the repeating groups of atoms that make up the two samples have two of the same types of atoms.

Question 2

Where did Dr. Yung (the chemist near Westfield) find the reddish-brown substance when she examined all the possible sources?

Accepted Answer

coming from the pipes into the houses

Answer

in the wells where the water comes from

Answer

in the ponds nearby the town

Answer

in all water everywhere in Westfield

Question 3

When examining the following evidence, which is the best evidence we should use?

Accepted Answer

white, small, grainy, crystals

Answer

ugly color, solid

Answer

white, small pieces

Question 4

A group of atoms joined together in a particular way...

Accepted Answer

molecule

Answer

atom

Answer

extended structure

Answer

property

Question 5

Review the results from Dr. Yung's lab. Based on this evidence, which claim about the reddish brown substance is best supported?

Accepted Answer

Claim 3: The reddish-brown substance is not the same as either the fertilizer or the substance that makes up the pipes.

Answer

Claim 1: The reddish-brown substance is the same as the substance that makes up the pipes.

Answer

Claim 2: The reddish-brown substance is the same substance as the fertilizer.

Question 6

Which word means a group of atoms joined together in a particular way?

Accepted Answer

molecule

Answer

model

Answer

property

Answer

scale

Question 7

Who had a better description of the sample?

Accepted Answer

Luisa

Answer

David

Question 8

letters and numbers showing the types and number of atoms that repeat to make up a substance (like H2O)

Accepted Answer

chemical formula

Answer

chemical equation

Answer

chemical latitude

Question 9

What is the law of conservation of mass in chemical reactions?

Accepted Answer

Mass is conserved and remains constant during a chemical reaction.

Answer

Mass is created during a chemical reaction.

Answer

Mass is destroyed during a chemical reaction.

Answer

Mass is converted into energy during a chemical reaction.

Question 10

Which of the following is an example of a chemical reaction?

Accepted Answer

Rusting of iron

Answer

Melting of ice

Answer

Boiling of water

Answer

Breaking a glass

Question 11

In a chemical reaction, what does the term 'reactants' refer to?

Accepted Answer

The substances that are consumed in the reaction

Answer

The substances that are produced in the reaction

Answer

The energy released during the reaction

Answer

The catalyst used in the reaction

Question 12

What is the role of a catalyst in a chemical reaction?

Accepted Answer

It speeds up the reaction without being consumed.

Answer

It increases the temperature of the reaction.

Answer

It decreases the temperature of the reaction.

Answer

It is consumed in the reaction to produce energy.

Question 13

Which of the following represents a balanced chemical equation?

Accepted Answer

$$\ce{2H2 + O2 -> 2H2O}$$

Answer

$$\ce{H2 + O2 -> H2O}$$

Answer

$$\ce{H2 + O2 -> 2H2O}$$

Answer

$$\ce{2H2 + 2O2 -> 2H2O}$$

Question 14

What is an exothermic reaction?

Accepted Answer

A reaction that releases heat to the surroundings

Answer

A reaction that absorbs heat from the surroundings

Answer

A reaction that occurs without any heat change

Answer

A reaction that requires light to proceed

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