S8P1 Review

Final review-Term 1 Grade 8

by Danelle Ackerman

Multiple Choice

The temperature of a substance increases as___.

• the substance expands
• the average kinetic energy of its particles increases
• the substance's volume increases
• the substance's mass increases

Multiple Choice

The lowest possible temperature is___.

• 0⁰F
• 0 K
•  0⁰C
• 273 K

Multiple Choice

If the particles of two substances have the same average kinetic energy, then___.

• the specific heats of the substances are identical 
• the particles will not react chemically
• the substances have equal thermal energies
• the substances have equal temperatures

Multiple Choice

Heat is thermal energy that flows between objects that differ in___.

• temperature
• radiation
• thermal energy
• specific heat

Multiple Choice

A measure of the average kinetic energy of the particles in an object

• temperature
• absolute zero
• thermal expansion
• none of these are the answer

Multiple Choice

The total kinetic energy of a substance's particles

• thermal energy
• heat
• convection
• conduction

Multiple Choice

Thermal energy that flows between an object at a higher temperature to an object at a lower temperature

• heat
• thermal expansion
• insulation
• specific heat

Multiple Choice

What is the original source of the most of the energy that people use?

• By radiation from the sun.

• By convection from the sun.

• By radiation from the Earth's core.

• Conduction from Earth's core.

Multiple Choice

Which best explains how this roasting marshmallows happens?

• Heat from the fire is conducted into the marshmallow.

• Heat from the fire is radiated into the marshmallow.

• The coolness of the marshmallow is conducted into the fire.

• The coolness of the marshmallow is radiated into the fire.

Multiple Choice

Why should space be left at the top of the plastic bottle when filling with water and then freeze?

• Because water expands when frozen.

• Because water contracts when frozen.

• Because plastic contracts when frozen.

• Because plastic expands when frozen.

Multiple Choice

Popcorn is made from corn kernels. What happens when kernels are heated in a microwave?

• The kernels expand.

• The kernels dissolve.

• The kernels become hard and brittle.

• The kernels stick together to form ball.

Multiple Choice

Which of the following best describes CONVECTION?

• When heat is transferred through waves.

• When heat is transferred through objects that are touching.

• The movement of gas or liquid in which warmer parts move up and the colder parts moves down.

Multiple Choice

Is a device that converts electric energy into thermal energy

• thermostat

• Heating appliance

• refrigerator

Multiple Choice

Is a device that regulates the temperature of a system.

• thermostat

• heating appliance

• bimetallic coil

Multiple Choice

What causes the bimetallic coil inside a thermostat to expand and contract?

• pressure changes

• metal changes

• temperature changes

Multiple Choice

electrons have a _________ charge

• positive

• negative

• neutral

Multiple Choice

What is the atomic number?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

Multiple Choice

How many valence electrons can fit in the first energy level?

• 2
• 1
• 4
• 8

Multiple Choice

What is the goal of an atom?

• To become stable by filling its energy level with all its valence electrons
• To bond with another atom
• To gain the most amount of energy possible
• To lose all its electrons

Multiple Choice

What group on the periodic table is stable on its own because they have all their valence electrons?

• Noble Gases
• Halogens
• Alkali
• Alkaline Earth

Multiple Choice

What's a valence electron?

• electrons in the second energy level
• electrons in the outermost energy level
• the atomic number
• electrons in the first level

Multiple Choice

What type of elements form covalent bonds?

• Metals

• Non Metals

• Metalloids

• Nobel Gas

Multiple Choice

When a covalent bond forms _______________ are shared.

• protons

• nutrons

• valence electrons

• quarks

Multiple Choice

Compounds have _________________ properties, compared to the elements that form them.

• similar

• different

Multiple Choice

How many valence electrons does Oxygen (O) have?

• 6

• 8

• 15

• 16

Multiple Choice

How many atoms of hydrogen are in a sugar molecule with the formula C₆H₁₂O₆

• 12

• 6

• 24

• 18

Multiple Choice

Atoms that are _____________ will form bonds.

• stable

• unstable

Multiple Choice

Polar molecules form due to ___________ sharing of valence electrons.

• equal

• unequal

• greater

• group

Multiple Choice

What happens when two oppositely charged ions are pushed together?

• they will repel (move apart)

• they will be attracted to each other (move together)

Multiple Choice

What happens when two negatively charged ions are pushed together?

• they will repel (move apart)

• they will be attracted to each other (move together)

Multiple Choice

The positive ions tend to _____________ electrons.

• lose

• gain

Multiple Choice

The negative ions tend to _____________ electrons.

• lose

• gain

Multiple Choice

Where are the nonmetals located on the periodic table? 

• Blue
• Red
• Green

Multiple Choice

Where are metals located on the periodic table?

• Blue
• Green
• Red

Multiple Choice

What type of bond is illustrated above?

• Metallic
• Ionic
• Covalent
• Wiggly

Multiple Choice

What type of bond is present when electrons are freely shared between metal atoms?

• Metallic
• Ionic
• Covalent
• Hippie

Multiple Choice

What is the arrow in a chemical equation...
H_{2 +} O --> H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Multiple Choice

The substances at the beginning of a chemical equation are called the ____

• product
• yield
• chemical symbol
• reactants

Multiple Choice

Which of the following is evidence of a chemical reaction?

• fizzing
• water changing to ice
• saltwater
• paper being cut in half

Multiple Choice

What are Chemical Reactions?

• It's when you mix substances.
• a process in which atoms rearrange to form new substances
• When something bubbles.
• letter and numbers showing the types and number of atoms

Multiple Choice

How many F atoms are in this compound?
6MgF₂ 

• 2
• 6
• 8
• 12

Multiple Choice

A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.

• Coefficient
• reactant
• subscript
• product 

Multiple Choice

Combining substances to form a new substance

• Displacement
• Synthesis
• Decomposition
• Oxidation

Multiple Choice

Breaking down a substance into simpler substances

• Displacement
• Synthesis
• Decomposition
• Oxidation

Multiple Choice

Switching one substance for another

• Displacement
• Synthesis
• Decomposition
• Oxidation

Multiple Choice

What type of reaction is the equation 2NaCl →2Na +Cl₂?

• Synthesis Reaction
• Decomposition Reaction
• Single Displacement Reaction
• Double Displacement Reaction

Multiple Choice

The energy required to start a chemical reaction is ___.

• endothermic

• exothermic

• activation

• released

Multiple Choice

Energy is _____ when new bonds form.

• absorbed

• released

• lost

• gained

Multiple Choice

Energy is ______ when bonds break.

• gained

• lost

• released

• absorbed

Multiple Choice

An _______ reaction is when more thermal energy is absorbed than is released.

• endothermic

• endergonic

• exothermic

• exergonic

Multiple Choice

An _______ reaction is when more thermal energy is released than is absorbed.

• endothermic

• endergonic

• exothermic

• exergonic

Multiple Choice

In a stable atom the amount of electrons is equal to the amount of

• neutrons

• protons

• atomic mass

• neutrons + protons

Multiple Choice

What is the charge of the electron

• positive
• no charge
• negative
• neutral

Multiple Choice

What types of charges attract?

• Positive and Positive
• Positive and Neutral
• Negative and Neutral
• Positive and Negative

Multiple Choice

Electric charges that are alike _______ each other.

• Attract
• Repel

Multiple Choice

Electric charges that are different _______ each other.

• Attract
• Repel

Multiple Choice

If a substance has an excess number of electrons on its surface, what type of charge does it have?

• A negative charge
• A positive charge
• A neutral charge
• A nuclear charge

Multiple Choice

A balloon has a negative charge. A glass rod has a positive charge. What will happen when the rod is brought near the balloon?

• the balloon will be attracted to the rod

• the balloon will remain in place

• the balloon will be repelled by the rod

• the balloon will spin in circles

Multiple Choice

If an object has a net charge of +2e this means it has

• lost 2 electrons
• gained 2 electrons
• lost 2 protons
• gained 2 protons