Chemical Reactions Unit Test 2024-25

(a)   : matter can not be created or destroyed, only rearranged

Tags

NGSS.MS-PS1-5

(a)   : the tiny pieces that all matter, all the stuff in the world is made of

Tags

NGSS.MS-PS1-1

(a)   : a starting substance that is part of a chemical reaction

(a)   : to change the order or position of something

Which of the following is NOT a chemical property?

• hard

• shiny

• made of carbon atoms

• boils at 23C

What atom does the chemical symbol Cl refer to?

• 17

• Chlorine

• Carbon

• Halogen

Tags

NGSS.MS-PS1-1

What atoms and how many of each element compose 3H₂O?

• It is composed of 2 atoms of H and 1 atom of O.

• It is composed of 6 atoms of H and 3 atoms of O.

• It is composed of 5 atoms of H and 1 atom of O.

• It is composed of 6 atoms of H and 4 atoms of O.

Tags

NGSS.MS-PS1-1

Choose the claim about the samples below that you think fits best.

• All three samples have the same properties. Therefore, they are the same substance.

• Two samples have the same properties. Therefore, they are the same substance. However, one sample has a different set of properties. Therefore, this sample is a different substance.

• All three samples have different properties. Therefore, they are different substances.

Tags

NGSS.MS-PS1-1

A scientist mixed two samples together: a white solid and a colorless gas. He analyzed the results and found two ending substances. One ending substance is made up of the repeating group of atoms shown. Which of the diagrams shows the repeating group of atoms that make up the samples the scientist mixed together?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Why do different substances have different properties?

• Groups of atoms repeat to make up a substance.

• Substances are made up of different groups of atoms.

• Atoms change type when rearranging into different substances.

• The law of conservation of matter says why this happens.