RETEST: District Benchmark

A student creates a mixture of water and washing soda weighing 10 g and a mixture of water and epsom salts weighing 15 grams. He knows that when he mixes the two substances a chemical change will occur. According to the law of conservation of mass, what should the weight of the products be after he mixes them?

• 10 g

• 15 g

• 5 g

• 25 g

Tags

NGSS.MS-PS1-5

• Procedure 1: All the reactants were liquids that evaporated.

  Procedure 2: A gas was formed as one product, and it escaped into the air.

• Procedure 1: One of the reactants was converted to thermal energy. Procedure 2: All the products were liquids.

• Procedure 1: The reactants were liquids with different densities. Procedure 2: The reactants were combined into only one product.

• Procedure 1: One of the products was a gas that escaped into the air. Procedure 2: A gas from the air reacted with one of the other reactants.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

• A

• B

• C

• D

Both the esophagus and the small intestine are involved in the digestion of food. The esophagus squeezes food into the stomach by wave-like muscle contractions. Peptidase enzymes in the small intestine break food molecules into smaller molecules.

Which statement best describes changes to food during digestion?

• The muscle contractions result in physical changes, while the action of the peptidase results in chemical changes.

• The muscle contractions and the action of the peptidase both result only in physical changes.

• The muscle contractions result in chemical changes, while the action of the peptidase results in physical changes.

• The muscle contractions and the action of the peptidase both result only in chemical changes.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

• F

• G

• H

• J

Tags

NGSS.MS-PS3-1

The list include six situations

1. A book sliding across a table at a constant speed
2. A ball sitting on a shelf
3. A can rolling down a ramp
4. A swing moving back and forth
5. A car traveling at a constant speed of 15 m/s
6. A bird landing on a branch

Which objects in the list experience an unbalanced force?

• 1. the book, 2. the ball, and 5. the car
• 1. the ball, 5. the car, and 6. the bird
• 1. the can, 4. the swing, and 6. the bird
• 1. the book, 2. the ball, 3. the can. and 4 the swing

Tags

NGSS.MS-PS2-2

• Action: The force of the bird on the wires Reaction: The force of the wires on the fence post

• Action: The force of the wires on the fence post Reaction: The force of the fence post on the bird

• Action: The force of the fence post on the bird Reaction: The force of the bird on the wires

• Action: The force of the bird on the fence post Reaction: The force of the fence post on the bird

Tags

NGSS.MS-PS2-1

• Rocket 1

• Rocket 2

• Rocket 3

• Rocket 4

Tags

NGSS.MS-PS2-2

• Kinetic energy increases. Potential energy decreases.

• Kinetic energy increases. Potential energy remains constant.

• Kinetic energy remains constant. Potential energy decreases.

• Kinetic energy remains constant. Potential energy increases.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

NGSS.MS-PS3-2

• The vinegar took the shape of the container in step 1.

• The steel wool sank into the vinegar in step 3.

• The temperature of the vinegar increased during step 4.

• The steel wool changed shape during step 6.

Tags

NGSS.MS-PS1-2