If the temperature of a substance is increased in an open container, how is density affected?

Density decreases bc atoms w/more energy move farther apart

Elements can change state of matter by

Increasing or decreasing temperature and pressure

In the process of ice melting into water, what is happening?

A physical change in the arrangement of molecules of water

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CHEMISTRY 101

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8th Graders reviewing basic vocabulary on atoms, elements, compounds, molecules, and mixtures (homo and hetero) #8thGrade #Chemistry #Middleschool #Science

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Questions 14

Answers

1
If a substance DECREASES in pressure, how is density affected?
The density does not change
The density decreases
The density increases
2
A COMPOUND is
A substance with chemical bonds between two or more elements
The smallest unit of matter
Any two things combined together
A physical combination of two or more substances
3
Which of these is an ELEMENT
Air
Carbon Dioxide
Water
Carbon
4
Which of the following is the best example of a heterogeneous mixture?
Coffee
Saltwater
Salad
Water
5
Density is measured as
the ratio of volume to pressure
the weight of a substance
the ratio of mass to volume
the ratio of pressure to volume
6
If one compound is evenly dissolved into another, what is formed?
Element
Homogeneous Mixture
Compound
Heterogeneous Mixture
7
In which state of matter is the density the highest?
Liquid
Gas
The density is the same in all states of matter
Solid
8
What is a good method for separating a homogeneous mixture?
Picking Apart
Magnetism
Filtering
Boiling or Evaporating
9
If two elements undergo a chemical reaction and reform into a single substance, what is formed?
Compound
Heterogeneous Mixture
Homogeneous Mixture
Element
10
How small are atoms?
between 30X10 ^ -12 and 300X10 ^ -12 meters
between 30X10 ^ -2 and 300X10 ^ -2 meters
between 30X10 ^ 12 and 300X10 ^ 12 meters
between 30 and 300 meters
11
If the temperature of a substance is increased in an open container, how is density affected?
Density remains the same bc it's still the same substance
Density decreases bc atoms w/more energy are closer together
Density decreases bc atoms w/more energy move farther apart
Density increases bc atoms @ higher temp are closer together
12
Elements can change state of matter by
Changing into a different type of atom
Bonding chemically with another substance
Increasing or decreasing temperature and pressure
Losing or gaining electrons
13
In the process of ice melting into water, what is happening?
Water is breaking down into Hydrogen and Oxygen
The molecules of water in the ice are slowing down
A physical change in the arrangement of molecules of water
The water molecules are reacting with the Oxygen in the air
14
The temperature at which a substance changes from a liquid to a gas is
100 C
Boiling point
Melting point
Freezing point

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