Scientific Method
This group does not receive the independent variable
Control Group
This type of mixture has its components uniformly distributed
Homogenous
What equation can be used to calculate density
Mass/Volume
Temperature and Volume are directly proportional. When one goes up the other goes up.
What are the three main phases of matter?
Solid, Liquid, and Gas
What must be done before making a valid hypothesis
Research
It isn't a problem when a substance is dissolved because it creates a
Solution
What are the two ways you can measure the volume of an object?
LxWxH
Water Displacement with a graduated cylinder
As one increases the other decreases.
A change from a solid directly to a gas is referred to as what?
Sublimation
_____ Data is observable with the 5 senses
_____ Data must be measured in units
Qualitative and Quantitative
A mixture is different from a compound because
Mixtures are physically combined and compounds are chemically combined
Will an object with a mass of 20 grams and a volume of 10cm float in water? Why or Why not!
NO because the Density would be 2 which is higher than water's density of 1
Why does a basketball feel squishy when left out in the cold?
Pressure decreases as the particles in a basketball slow down, temperature decreases and decreases the volume of the gas in the ball
Why doesn't the temperature of matter increase during a phase change?
Thermal energy is being used to break bonds and escape pressure, not to change temperature
There may be many of this type of variable in an experiment
Dependent Variable
Conducting electricity, radioactivity, and flammability are all examples of
If the density is 4 g/ml and the volume is 8 ml, what is the mass?
32 Grams!
Why is a large amount of gas able to fit into a rigid container if the container can not expand?
Gas has an indefinite volume and shape so it can be compressed into the container
Describe the particle motion when a substance is transforming from a liquid to a solid.
Particles will slow down as they lose thermal energy. Bonds will reform between particles and create a rigid structure. Particles will no longer flow and instead vibrate in place.
Will ice melt faster with salt, sugar, or sand present?
If you were making an experiment to answer this question, what your be your independent, dependent, and control variables?
Independent: Salt, Sugar, Sand
Dependent: time it takes to melt
Control: Ice with nothing on it
(Co2, NH4, H2O)
Compounds MUST be made from two or more DIFFERENT Elements. Molecules can be compounds but not all of them are.
If my density is 6 g/ml and my mass is 66 grams what is my Volume?
11 ml
In what two scenarios will gas pressure increase?
If the volume of a gas is reduced at a fixed temperature or when the temperature of a gas is increased at a fixed volume
Identify all phase changes
Solid to Liquid
Liquid to Gas
Gas to Liquid
Liquid to Solid
Solid to Gas
Melting
Vaporization
Condensation
Freezing
Sublimation