mixtures
density
changes/properties
phase changing
wild card
100
H2, O2, and Cl2 are examples of what kind of molecule?
Diatomic
100
If a cube has one side that measures 3 cm and has a mass of 20 g, what is its density?
180 g/cm
100
What is the difference between a physical and a chemical change?
chemical= something new is created
100
Which state of matter has a definite volume, but not a definite shape?
liquid
100
If an object has a volume of 125 ml and a mass of 120 g, would the object sink or float?
float
200
give two examples of heterogeneous mixtures.
chex mix, concrete, etc.
200
Given the density of 10g/cm and a volume of 30cm what is the object's mass?
300 g
200
name 2 chemical and 2 physical properties of gold that makes it good for jewelry.
Chemical= not reactive, non flammable. Physical= easily bent into shapes, nice color
200
What is it called when we go from a solid directly to a liquid?
melting
200
What does Boyles' law state?
The volume of a gas is inversely proportional to the pressure
300
Na, Ca, and Si are examples of what kind of substance?
elements
300
Densities: aluminum= 2.3, Salt water= 1.1, kerosine= .72, and iron= 3.1. Put them in order based on where they would be in water. Top to bottom
kero, salt, alu, iron
300
what are the four ways we know a chemical change has occurred?
precipitate formed, change in energy, color change, gas formed
300
going from a gas to a solid
deposition
300
An amorphous solid means what?
the solid has not uniform structure and can be molded very easily.
400
What is the smallest unit of an element?
atom
400
Would the object with a density of 0.97 sink or float?
float
400
name two chemical differences between iron and paper.
paper is non conductive and flammable.
400
what are the four states of matter in order starting with the least amount of energy to the most.
solid, liquid, gas, plasma
400
how many total atoms and molecules in the following compound? 3CaCO
9 atoms and 3 molecules
500
Tap water is which of the following, Homogenous, heterogenous, element, or compound?
homogenous
500
a rectangle has measurements of 8/9/2 and a mass of 26 g. What is its density?
.18
500
If I bend a steel bar what type of change is that?
physical
500
describe the how the particles are moving in a solid?
vibrating.
500
What does Charles' law state?
The volume of a gas is proportional to the temperature
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