Density
What is the formula for volume?
Volume = length x width x height
Physical change or Chemical change?
Evaporation of liquid water
Physical change
What type of change is burning paper?
Chemical change
The smallest particle of an element that has all the properties of the element is a(n):
3 cm x 6 cm x 13 cm = 234 cm3
What is the formula for density?
Density = Mass / Volume
Element or compound
CO2
Compound
What type of mixture is chocolate chip ice cream?
Heterogeneous Mixture (each spoonful has a different amount of chocolate chips)
Elements
If a sample of gold (D = 19.3 g/cm3) had a volume of 1 cm3 , then what would the mass be?
D = m/v
19.3 g/cm3 = m/1 cm3
m=19.3 g
For an object to float in liquid water, it's density would need to be less than what? (with units)
1 g/cm3
Heterogeneous or Homogeneous Mixture
Fruit salad
Heterogeneous Mixture
What type of change is baking a cake?
BONUS: There are two types of change
Chemical change & Endothermic change
What is the difference between mass and weight?
mass = the measurement of how much matter an object contains
weight = the measurement of the force of gravity on an object
If a cube of quartz weighed 30 g and the volume was 15 cm3, what is the density?
D = m/v
D = 30 g / 15 cm3 = 2 g/cm3
What are the units for density?
BONUS: double if you can list both units
g/cm3 and g/mL
Endothermic or Exothermic change
Combustion
BONUS: what happens to the atoms during a chemical change?
Exothermic change (energy can also be in the form of light)
BONUS: they are rearranged
What type of change is a change of state?
Physical change
Define Endothermic AND Exothermic Change
Endothermic: energy is absorbed
Exothermic: energy is released
An object has measurements of 6 cm long, 2 cm high, and 3 cm wide. It weighs 18 g. What is the object's density? (with units)
D = m/v
V = 6 cm x 2 cm x 3 cm = 36 cm3
D= 18 g / 36 cm3 = 0.5 g/cm3
If an object is irregular shaped, how would you measure the volume of the object?
Displacement - submerging the object in water
Pure substance or Mixture
Table salt
Pure substance
Is oxygen gas an element or compound?
Compound (Oxygen gas = O2)
A single kind of matter that is pure, having specific makeup and specific properties.
A Substance
The object you are trying to measure is irregular. You fill a graduated cylinder to 20 mL and after placing the object into the water, it rises to 30 mL. The object's mass is 45.7 grams. What is its density? (with units)
D=m/v
D= 45.7 g / 10 mL = 4.57 g/mL