Test Test Answers

25 verified answers

Heat transfer between two substances is affected by specific heat and the

chemical composition of the substances.

state of matter of the substances at room temperature.

thermal equilibrium of the substances.

amount of time and area of physical contact between the substances.

Nuclear reactions in a reactor produce a lot of thermal energy. That energy then flows and warms up water, which boils and produces steam. The steam then turns turbines that generate electricity.

Heat flows in the form of electricity.

Heat flows from the reactor to the water.

The water produces heat.

The steam produces heat.

Which energy graph represents the nonspontaneous transition of graphite into diamond?

A graph with Reaction progression on the horizontal axis and energy on the vertical axis. A line starts low on the vertical axis, runs briefly parallel to the horizontal axis, slopes up sharply, curves down a short distance, and levels out.

A graph with Reaction progression on the horizontal axis and energy on the vertical axis. A line starts midway up the vertical axis, runs briefly parallel to the horizontal axis, slopes up sharply, curves down sharply, and levels out below the initial starting point.

A graph with Reaction progression on the horizontal axis and energy on the vertical axis. A line starts midway up the vertical axis, runs briefly parallel to the horizontal axis, slopes up a small amount, then curves down to level out below the initial starting point.

A graph with Reaction progression on the horizontal axis and energy on the vertical axis. A line starts midway up the vertical axis, runs briefly parallel to the horizontal axis, slopes up a moderate amount, then curves down sharply to level out below the initial starting point.

Which best describes heat?

energy that is carried by electric and magnetic fields

energy that decreases as a car slows to a stop

energy that increases as a book is lifted to a higher shelf

energy that flows from a hot mug of tea to a cold hand

Two metal blocks that have slightly different temperatures are placed next to one another. After five minutes, they both have lower but equal temperatures. According to the law of conservation of energy, what most likely happened?

Energy was created inside the blocks.

Energy was destroyed inside the blocks.

Energy was absorbed into the blocks from outside the system.

Energy was transferred from the warmer block to the cooler block.

A reaction occurs when solid X is placed into solution Y. As a result, the temperature of the new solution increases by 3°C. The temperature rises another 2°C when more of solid X is added to the solution. What does this indicate about the effect of adding more solid?

It increased the number of molecular collisions.

It decreased the number of molecular collisions.

It decreased the space between the molecules and lowered the reaction rate.

It increased the space between the molecules and increased the reaction rate.

A welding torch produces a flame by burning acetylene fuel in the presence of oxygen. This flame is used to melt a metal. Which energy transformation represents this process?

chemical energy into thermal energy

kinetic energy into potential energy

kinetic energy into electromagnetic energy

potential energy into chemical energy

What happens as the activation energy increases?

The pressure of the system decreases.

The kinetic energy of colliding molecules changes.

The reactant surface area decreases.

The reaction begins to slow down.

Which is the best example of how electromagnetic energy is used?

a pot of boiling water on a gas stove

a patient receiving an X-ray in a hospital

a car burning gasoline to power the engine

a car of a roller coaster moving quickly down a slope

Which refers to the thermal energy that flows from one substance to another when the substances differ in temperature?

heat

temperature

convection

flow

A stovetop burner on medium reaches 95°C. Which will also receive a flow of heat directly from the burner?

the surrounding air

a burner at the same temperature

a pan heated to 100°C

hotter water inside a pan

Which statement best applies collision theory to preventing a dangerous reaction from occurring?

Store the reactants together at a low pressure.

Keep all sparks or flames away from the reactants.

Store the reactants together at a low temperature.

Keep the reactants in separate containers.

Which energy change best relates to a boulder that is rolling down the side of a hill?

potential energy transforming into kinetic energy

mechanical energy transforming into thermal energy

potential energy transforming into electromagnetic energy

mechanical energy transforming into electromagnetic energy

The diagram below shows the movement of particles.What does this piece of evidence best support?

the collision theory

the Maxwell-Boltzmann distribution

the effect of pressure on reaction rates

the effect of temperature on reaction rates

Which refers to the amount of heat required to change the temperature of 1 gram of a substance by 1°C and is related to the chemical composition of the substance?

Thermal energy

Specific heat

Activation heat

Boiling point

Isaac wants to make s'mores. He holds a marshmallow on a metal skewer over a fire. A few seconds later, the marshmallow is cooked and the skewer feels warm. What most likely happened?

The fire heated the surrounding air, which cooked the marshmallow.

The heat generated from the marshmallow flowed in the form of thermal energy to the skewer and fire.

The heat from the skewer cooked the marshmallow.

Thermal energy in the form of heat moved from the fire to the skewer and marshmallow.

Which is the best term to use when describing the energy of motion?

chemical

kinetic

potential

thermal

Consider the energy diagram below.xn.Which line indicates a higher reaction rate?

A because it has a lower activation energy.

B because it has a lower activation energy.

A because its Grxn is much lower.

B because its Grxn is much lower.

Which scenario would adhere to the law of conservation of energy?

Energy is created when water freezes.

Energy is destroyed when sugar is burned.

Energy stays inside molecules permanently.

Energy is transferred when atoms are rearranged.

A baseball player hits a ball. Which is the best description of the energy of the ball as it flies over the pitcher’s head?

chemical

kinetic

nuclear

thermal

Which will cause an increase in the reaction rate between molecules?

Molecules have strong internal bonding.

Molecules collide more frequently.

Electrons in the bonds remain in a meta-stable state.

Electrons do not have enough energy to leave the bonds.

Which statement describes thermal energy?

the energy that is associated with electric fields

the energy that is stored in chemical bonds

the energy that is associated with the pull of gravity

the energy that is associated with temperature

Which direction does heat flow from?

hot to cold

cold to hot

hot to hot

cold to cold

Consider the reaction below.C2H4(g) + H2(g) C2H6(g)Which change would likely cause the greatest increase in the rate of the reaction?

decrease temperature and decrease pressure

increase temperature and decrease pressure

decrease temperature and increase pressure

increase temperature and increase pressure

What happens to energy when Sally kicks a soccer ball?

Kinetic energy is transformed to chemical energy in muscles.

Potential energy is transformed to chemical energy in muscles.

Kinetic energy is transferred from the leg to the soccer ball.

Potential energy is transferred from the leg to the soccer ball.

Did you find these answers helpful?

Test Test Answers

More from this Course

TRY EDGENUITY HACKS