Chemical Reactions Unit Review

What does "rearrange" mean?

• To make sure to read all of the answers on the quiz

• To not add or take away but to move things around. To remix

• To not just choose the longest answer because sometimes teachers put in long answers to make sure you are paying attention.

• To not pick the shortest answer

Tags

NGSS.MS-LS1-7

NGSS.MS-PS1-5

Can one substance in a chemical reaction change into another substance? (read carefully)

• No, because things can mix, but they can't change into new things

• Yes, because new atoms can be created

• No, because atoms can not be destroyed

• Yes, because atoms can be rearranged.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a reactant?

• Something that is produced at the end a chemical reaction.

• A starting substance before a chemical reaction

• always stays the same in a chemical reaction

• is always destroyed in a chemical reaction

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Samira watched a demonstration in which a scientist combined two substances in a sealed container and analyzed the results. The ending substances did not look the same as the starting substances.

Samira was given a diagram with the repeating groups of atoms that make up the starting substances, plus information about the properties of the starting and ending substances. She created a model of the repeating groups of atoms that might make up the two ending substances.

• Samira's model correctly demonstrates how the properties changed with the rearrangement of the atoms. However not all atoms are accounted for. There is a missing reactant.

• Samira's model is correct because the properties are different and the atoms are rearranged.

• Samira's model is incorrect because not all atoms are accounted for

• Samira's model correctly demonstrates how the properties changed with the rearrangement of the atoms. However not all atoms are accounted for. There is a missing product.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a product (in chemical reactions)?

• is always destroyed in a chemical reaction

• the substance that is used at start a chemical reaction.

• The substance(s) that are created after a chemical reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is an atom?

• Water is an atom

• The Hydrogen (H)s and the Oxygen (O)s are atoms

• The H2O is an atom

• None of these are atoms

Tags

NGSS.MS-PS1-1

What is a molecule?

• The H2O is a molecule

• The Hydrogen (H)s and the Oxygen (O)s are molecules

• The H2O is an atom

• None of these are molecules

Tags

NGSS.MS-PS1-1

According to the law of conservation of mass, matter cannot be created or ________

Tags

NGSS.MS-PS1-5

True or False: In a complete chemical equation, there must be the same number of atoms of each element on the reactants and products side.

• True

• False

Tags

NGSS.MS-PS1-5

In a chemical reaction, atoms ________ and form new bonds.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5