8.5E/7.6A & 8.6AB Review

The student concluded that a chemical change had occurred.  Which of the following observations provides the least support for this student’s conclusion?

• The temperature of the combined solutions increased.

• The clear solution was poured into the blue solution.

• A gas formed and bubbled out of the final solution.

• The color of the solutions changed after they were mixed.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Iron is an element that can chemically react with other substances.  When iron reacts with oxygen, rust is produced.  Which observation supports the conclusion that a chemical reaction has occurred between iron and oxygen?

• Iron is a metallic element.

• A new substance is formed.

• Oxygen is in the form of a gas.

• None of these.

Tags

NGSS.MS-PS1-2

Which of the following processes that occurs during digestion would be classified as a physical change?

• Enzymes convert proteins into amino acids

• Stomach acids break part sugars into smaller molecules

• Large pieces of food are torn into smaller pieces by the teeth

• Saliva converts complex carbohydrates into simpler substances

How many different ELEMENTS are taking part in the chemical reaction shown?

• 1

• 2

• 3

Tags

NGSS.MS-PS1-1

How many atoms are represented in the products of the chemical equation?

• 6

• 9

• 12

• 15

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The products shown in the chemical reaction above would best be classified as -

• two elements and a compound

• two compounds  and an element

• three elements

• three compounds

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Which of the following objects had the greatest force applied to it?

• An object with a mass of 10 kg and an acceleration of 2.5 m/s²

• An object with a mass of 12 kg and an acceleration of 3.0 m/s²

• An object with a mass of 20 kg and an acceleration of 1.5 m/s²

• An object with a mass of 15 kg and an acceleration of 1.0 m/s²

Tags

NGSS.MS-PS2-2

A toy car was used in an investigation about unbalanced forces.  During which of the following scenarios was the car not experiencing an unbalanced force?

• The toy car speeds up as it rolls down a ramp.

• The toy car travels forward at a constant speed.

• The toy car slows down as it rolls up a hill.

• The toy car changes direction at a constant speed.

Tags

NGSS.MS-PS2-2

A toy car with a mass of 0.15 kg is pushed forward.  The car begins to move with an acceleration of 3.0 m/s².  What is the net force being applied to the toy car?

• 0.05 N

• 0.45 N

• 3.15 N

• 20 N

Tags

NGSS.MS-PS2-2

During which segment was animal standing still?

• Between 0 s and 2 s

• Between 2 s and 3 s

• Between 3 s and 4 s

• Between 4 s and 5 s

Tags

NGSS.MS-PS3-1