Unit 1: Thermal, nuclear and electrical physics

What is the best definition of Temperature?

• A vectorial quantity that measures the "degree of hotness", related to the internal energy of an object.

• A scalar quantity that measures the "degree of hotness", related to the internal energy of an object.

• A vectorial quantity that measures the "degree of hotness"

• A scalar quantity that measures the "degree of hotness"

As energy in the form of heat is transferred to a substance, the particles will increase...

• Their temperature

• Their intermolecular potential energy

• Their average individual velocities.

• Nothing will increase

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-4

The internal energy of a substance is of a substance can be defined as:

• Heat

• The average random kinetic energy

• The intermolecular potential energy

• The sum of both intermolecular potential energy and random kinetic energy

When heating something, ONLY the intermolecular potential energy will change only if:

• There is a change in phase

• There is a change in temperature

• Nothing changes

• The heat decreases

It is defined as the energy needed to be transferred to 1 kg of substance in order to elevate its temperature by 1 K.

• Heat

• Specific heat capacity

• Latent heat

• Change in temperature

Tags

NGSS.HS-PS3-4

The latent heat of vaporization can be defined as

• The energy required to change the phase from solid to liquid (and vice versa)

• The energy required to change the phase from liquid to gas (and vice versa)

• The energy needed for a substance to increase its temperature 1 K

• None of the options are correct.

Tags

NGSS.HS-PS3-4

Consider the following isotope.

Write down the number of protons of it.

Consider the following isotope.

Write down the number of neutrons of it.

Tags

NGSS.HS-PS1-8

An isotope of bromine has the following symbol: Br-80. How many nucleons does it have if its atomic number is 35?

Which of these particles can be considered as "nucleons"

• Only protons

• Only neutrons

• Only electrons

• Both protons and neutrons

Tags

NGSS.HS-PS1-8