Formulas
The change in energy between which two states of matter is calculated by the equation Q=m∆H(fus)?
Solid and liquid.
How many calories are in a single gram of fat?
9
What is the overarching term for a liquid turning into a gas?
Vaporization.
Which state of matter is characterized by fixed volume and fixed shape?
Solid.
What is a molecule?
A group of atoms bonded together.
The energy in how many steps of the heating curve are found by the equation Q=mc∆T?
3 steps.
What two macronutrients have 4 calories per gram?
Carbs and protein.
What is the term for a gas turning directly into a solid?
Deposition.
Which state of matter can change in shape while keeping its volume?
Liquid.
What is a pure substance?
A substance fully made of one specific atom/molecule.
What equation would be used to caculate the energy needed to change a substance from a liquid to a gas?
Q=m∆H(vap).
A food with 5 grams of protein would contain how many calories?
20
It takes 2270 joules of energy to convert one gram of water into water vapor. How many joules of energy would it take to convert 5.00g of water into vapor? (with correct sig figs)
11400
Which state(s) of matter have particles that vibrate but cannot expand to fill a larger area?
Solid and liquid.
A pure water ice cube is an example of an:
a. element
b. compound
c. atom
d. mixture
b.compound
What is ∆H(fus) for H2O equal to?
334J/gC.
A food with 12 grams of carbs and 4 grams of fat would contain how many calories?
84
What is the term for the phase change that happens when a food item is freeze-dried?
Sublimation
Which state of matter is characterized by its high intermolecular forces?
Solid.
What is the difference between a homogeneous and heterogeneous mixture?
A homogeneous mixture is a mixture in which you cannot see the separation between the multiple substances that it is made of. In a heterogeneous mixture, you can see the separation.
What is the series of equations you would use to calculate the calories in the change from a solid at 0C to a gas at 100C?
m∆H(fus) + mc∆T + m∆H(vap)
A food contains 168 calories. It has no carbs and 8 grams of fat. How many grams of protein does it contain?
24
∆H(fus)=334J/g. How many joules would 11.0g of water need to lose to become ice at 0C? (with correct sig figs)
3670
Solid; absolute zero.
CU is an:
a. mixture
b. metal
c. atom
d. molecule
d. molecule