Spiral Review: 7.6, 7.7, 7.8, 7.9, 7.10

Which of the following best describes the difference between an element and a compound?

• Elements are pure substances made of one type of atom, while compounds contain multiple types of atoms chemically bonded

• Elements are always gases, while compounds are always solids

• Elements contain multiple types of atoms, while compounds contain only one type

• Elements and compounds are the same thing with different names

When examining the periodic table to identify atoms in the chemical formula H2O, what do you find?

• One hydrogen atom and two oxygen atoms

• Two hydrogen atoms and one oxygen atom

• Two oxygen atoms and one hydrogen atom

• Three hydrogen atoms only

Tags

NGSS.MS-PS1-1

Which is an example of a chemical change?

• Ice melting into water

• Paper being torn

• Iron rusting

• Sugar dissolving in water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In an aqueous solution, what is the solvent?

• The solid that dissolves

• Water

• The resulting mixture

• The concentration level

How does increasing temperature typically affect the rate of dissolution?

• It has no effect on dissolution

• It decreases the rate of dissolution

• It increases the rate of dissolution

• It stops dissolution completely

Tags

NGSS.MS-PS1-4

What is the formula to calculate average speed?

• Time ÷ Distance

• Distance × Time

• Distance ÷ Time

• Time + Distance

What is the key difference between speed and velocity?

• Speed is faster than velocity

• Velocity includes direction while speed does not

• Speed includes direction while velocity does not

• They are exactly the same thing

What does a horizontal line on a distance-time graph indicate?

• The object is accelerating

• The object is moving at constant speed

• The object is not moving

• The object is moving backward

According to Newton's First Law, an object in motion will:

• Eventually stop moving

• Speed up continuously

• Stay in motion unless acted upon by an unbalanced force

• Change direction randomly

Which method of heat transfer requires direct contact between substances?

• Radiation

• Convection

• Conduction

• All of the above