Compounds/Mixtures & Acids/Bases

What elements form CO₂ ?

• carbon

• oxygen

• cobalt

• hydrogen

Tags

NGSS.MS-PS1-1

What elements form H₂O ?

• carbon

• oxygen

• cobalt

• hydrogen

Tags

NGSS.MS-PS1-1

Which picture indicates a chemical reaction?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Mary gets balloons from her friends on her birthday in February. When she walks home, she notices that the balloons are no longer full. She searches the balloon for a hole and finds none. What is a possible reason for her deflated balloons?

• Some of the gas particles go out of the balloon.

• The gas particles in the balloon got closer together.

• The gas particles settled to the bottom of the balloon.

• The gas particles cooled and became smaller.

Which of the following is an explanation for the picture?

• New substances formed particles that are bigger than the ones before.

• Air got into the balloon.

• A new gas was created and the gas took up more space.

• The liquids reacted together and created more matter.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Phase changes are

• chemical changes because new substances are formed

• chemical changes because no new substances are formed

• physical changes because new substances are formed

• physical changes because no new substances are formed

Tags

NGSS.MS-PS1-4

The pH level of a weak acid is

• pH 1

• pH 6

• pH 7

• pH 8

• pH 14

The pH level of a strong acid is

• pH 1

• pH 6

• pH 7

• pH 8

• pH 14

The pH level of a strong base is

• pH 1

• pH 6

• pH 7

• pH 8

• pH 14

The pH level of a weak base is

• pH 1

• pH 6

• pH 7

• pH 8

• pH 14