Unit 7/8 flashcardiziziziz version 2

Front

What is specific heat?

Back

Specific heat is the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius.

Front

How do you calculate heat energy (Q)?

Back

Q = m * c * ΔT, where m is mass, c is specific heat, and ΔT is the change in temperature.

Front

What is the specific heat of water?

Back

4.184 J/g°C.

Front

What is a half-life?

Back

The half-life is the time required for half of the radioactive atoms in a sample to decay.

Front

If you start with 100 mg of a substance with a half-life of 6 hours, how much remains after 18 hours?

Back

12.5 mg.

Front

What is the pH of slightly acidic substances?

Back

Slightly acidic substances have a pH less than 7 but greater than 6.

Front

What is the triple point of a substance?

Back

The triple point is the temperature and pressure at which a substance can exist in all three phases: solid, liquid, and gas.

Front

What is the normal melting temperature of a substance?

Back

The normal melting temperature is the temperature at which a solid becomes a liquid at standard atmospheric pressure.

Front

What is the significance of the melting point?

Back

The melting point is a characteristic property of a substance and can be used to identify it.

Front

What is the relationship between temperature and heat energy?

Back

As heat energy is added to a substance, its temperature increases until it reaches its melting point.