Unit 1
What is the density of a liquid that has a mass of 24 g and volume of 8 mL?
3 g/mL
As volume increases, pressure ______
decreases
When liquid water at 20°C is cooled, its phase energy...
stays the same
1.26 g of iron reacts with 0.54 g of oxygen to form rust. What % mass is oxygen?
30.%
It's the part of the atom is most of the mass located
What is the nucleus?
It's a change that produces a new substance with different properties
What is a chemical change?
True or False: The speed of particles is related to their temperature.
True
Which state changes absorb energy from their surrounding?
melting, boiling
2.89 g of sulfur reacts with 5.72 g of copper. Calculate the % mass of each element
33.6% sulfur
66.4% copper
Gasoline has a density of 0.77 g/mL. What is the mass of 150 mL of gasoline?
120 g
How many sig figs are in 10.010?
5
If you have 2.90 L of gas at a pressure of 5.13 atm and a temperature of 50.00°C, what will the Celsius temperature of the gas be if you decrease the volume to 2.40 L and decrease the pressure to 3.00 atm?
-117 degrees C
When steam at 100°C turns to liquid water, its phase energy...
decreases
Identify the following ion:
Protons: 3
Neutrons: 4
Electrons: 2
7 3Li +
145 g of water is cooled from 75.0 degrees Celsius to 20.0 degrees Celsius. Calculate the amount of energy released.
33,400 J
Calculate the answer with the correct number of sig figs:
1.04 cm + 9.8 cm
10.8 cm
As temperature increases, pressure _____
increases
Calculate the amount of heat absorbed when 250.0 grams of water at 25.0°C is heated to 87.5°C.
65.4 kJ
It's the number of protons found in the nucleus of an atom and therefore identical to the charge number of the nucleus. The atomic number uniquely identifies a chemical element.
What is atomic number?
When steam at 100°C condenses to liquid water, the energy of the surroundings...
increases
Calculate the answer with the correct number of sig figs:
3.2 cm x 10 cm
30 cm
What would be the new pressure if 250.0 cm3 of gas at STP is compressed to a volume of 150.0 cm3?
1.667 atm
Calculate the amount of heat absorbed when 371 grams of water at 20.0°C is heated to 100.0°C then all boils away.
963 kJ
Identify the following atom/ion:
Protons:12
Neutrons:12
Electrons:10
Mg+2
When 10.0 g of ice melts, what happens to the energy of the surroundings?
It decreases by 3340 J