Describing and Classifying Matter
The abilities to dissolve in water and to conduct electricity are examples of (physical or chemical) properties
Physical
The amount of matter in an object
Mass
Icicles melting from a rooftop is an example of a (physical or chemical) change?
Physical change
A group of two or more atoms held together by chemical bonds
Molecule
How do you calculate density?
D= M/V
Density= Mass/ Volume
Combustion is an example of a (physical or chemical) property
Chemical
Weight is a flawed measure of mass because it is affected by what natural force?
Gravity
Clear liquids mixing to produce a cloudy liquid with yellow chunks is an example of a (physical or chemical) change?
Chemical change
The measure of force of gravity on an object
Weight
What is the density of an object whose mass is 180 grams and whose volume is 45 cm3?
4 g/cm3
D=m/v
180 grams/45 cm3= 4 g/cm3
Which of the following is a substance: Table salt, seawater, or sand?
Table salt
What formula do you use to calculate the volume of a regularly shaped object?
V= L x W x H
Volume= Length x Width x Height
This law states that matter is neither created nor destroyed
The Law of Conservation of Mass
Does not depend on an object's weight and is defined by the mass and volume of an object
Density
If a dog weighs 150 lbs on Earth, how much would the dog weigh on the moon?
Note: Remember that the moon has a gravitational pull that is approximately 1/6th of that on Earth
The dog would weigh 25 lbs.
Gravitational pull in comparison to Earth (1/6) x weight on Earth (150 lbs) = weight on the moon (25 lbs)
A mixture in which it is difficult or impossible to see the different parts is known as a (heterogeneous or homogenous) mixture
Homogeneous mixture
If a liquid has a density of less than 1 will it sink or float in water?
It will float on top of the water, as the density of water is 1 g/mL
A measure of how hot or cold something is defined as...
Temperature
A substance made of two or more elements that are chemically combined in a set ratio
Compound
The formula H2SO4 means that the chemical compound is comprised of how many atoms of each element?
2 Hydrogen atoms, 1 Sulphur atom, and 4 Oxygen atoms
Chocolate milk, coffee, smog, and air are all examples of (pure substances or mixtures)
Mixtures
The one factor that affects density is...
Temperature
The two types of energy that can be released when something burns are....
1. Thermal energy (Heat)
2. Light
Exothermic change
If an object is not regularly shaped, what is one way you could calculate it's volume...
Water displacement
Submerge the object in a known volume of water, the volume of the water that is displaced equals the volume of the object