7th grade science final

Which type of energy transfer occurs in a vacuum?

• convection

• combustion

• radiation

• conduction

A(n) ______ is a rod or plank that pivots about a fixed point.

• axle

• lever

• wedge

• pulley

Which of the following changes gives NO evidenc that a chemical reaction has taken place?

• Heating a blue solid turns solid white.

• A certain liquid is added to a solid, and bubbles of gas form.

• Two liquids are mixed, and a precipitate forms.

• A cube of solid forms a puddle of liquid.

Tags

NGSS.MS-PS1-2

Which particles have almost the same mass?

• proton and electron

• electron and neutron

• all three particles

• proton and neutron

An example of a chemical change is ______.

• dew disappearing from the grass

• mashing potatoes

• frying a hamburger

• a magnet sticking to the refrigerator

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What are two main types of energy that relate to motion?

• radiation and heat

• solar and thermal

• potential and kinetic

• conduction and convection

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Dot diagrams are used to represent _______.

• outer electrons

• atomic mass

• protons

• the structure of the nucleus

The change that is NOT a physical change is _______.

• freezing

• evaporating

• dissolving

• burning

Tags

NGSS.MS-PS1-4

What is the name of the elements in Group 2 of the periodic table?

• alkali metals

• boron family

• alkaline earth metals

• halogens

Which of the following notations represents a molecule?

• H₂O

• He

• NaCI

• Li

Tags

NGSS.MS-PS1-1