2nd Qtr Science Test - 8th grade

Which one is NOT an indicator of a chemical change?

• formation of gas

• change in temperature

• formation of liquid

• unexpected change of color

A physical change occurs during digestion when

• shape or size is altered.

• bubbles are released from a substance.

• a new substance is created

• a color change occurs.

What is considered a chemical change during digestion?

• Moving food through the esophagus by peristalsis.

• Churning food in the stomach.

• Absorption of water in the large intestines.

• Enzymes in the mouth and stomach breaking down fats, proteins, and carbohydrates.

How many iron atoms are in

Fe(NO₃)₂

• 1

• 2

• 3

• 6

Which of the following accurately describes the chemical formula of the molecule shown above?

• 3CH₈O

• C₃H₇O

• C₄H₈O₂

• C₃H₈O

Tags

NGSS.MS-PS1-1

Which elements are in the formula shown above?

• Tin and Chlorine

• Tin, Carbon and Lithium

• Sulfur, Nitrogen and Chlorine

• Sulfur, Nitrogen, Carbon and Lithium

Tags

NGSS.MS-PS1-1

How many elements are in this chemical formula?  $NaHCO_3$  

• 1

• 2

• 3

• 4

Students are playing tug-of-war. If group B pulls the rope to the right with a force of 400 N and group A pulls the rope to the left with a force of 250 N, what will happen to the ribbon in the middle of the rope?

• The ribbon will move to the left and group A will win the tug-of-war.
• The ribbon will move to the left and group B will win the tug-of-war.
• The ribbon will move to the right and group B will win the tug-of-war.
• The ribbon will move to the right and group A will win the tug-of-war.

Tags

CCSS.HSN.VM.A.3

The greater the mass, the ______force it takes to move it.

• less

• more

A girl is pushing a cart by herself with a force of 7 N. What will happen if a boy begins to help her and their combined force is 17 N?

• The cart will speed up.
• The cart will slow down.
• The cart will move at a constant speed in a straight line.
• The cart will fly to never never land!

Tags

NGSS.MS-PS2-2