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Density
What's the Matter?
Changes
Elements
Chemistry
100
The measurement of how much mass is contained in a given volume is called
density
100
Anything that has mass and takes up space is called
matter
100
One example of a physical change is a. burning paper. c. toasting marshmallows. b. baking cookies. d. dissolving salt in water.
dissolving salt in water
100
The ability to do work or cause change describes
energy
100
Table salt and water are examples of
substances
200
The volume of an irregular object can be measured by
submerging the object in water in a graduated cylinder.
200
How do liquid water, ice, and water vapor differ from each other?
They are different states of matter.
200
One example of a chemical change is a. filtering a mixture. c. boiling water. b. burning wood. d. crushing a can.
b. burning wood
200
What holds atoms together in a molecule?
chemical bonds
200
In the laboratory, volumes of liquid are usually measured with a(n)
graduated cylinder
300
The density of a block of wood with a volume of 50 cubic centimeters and a mass of 100 grams is
2 g/cm3
300
All elements are made of basic particles called
atoms
300
Fireworks exploding in the sky and giving off light are an example of what type of change? (endothermic or exothermic)
exothermic
300
Soil, a salad, and sugar water are all examples of
mixtures
300
The SI unit for mass
kilograms
400
Is the melting of an ice cube considered a physical change or a chemical change? Explain your reasoning.
physical change. the substance is still water, but in a different state.
400
If you describe methane as a gas that easily catches fire, you are describing a
chemical property.
400
The change in which ice absorbs energy and melts is a(n)
endothermic change.
400
H2O, CO2, and C12H22O11 are all examples of chemical
formulas
400
If you heat a liquid and measure the temperature at which it boils, you are measuring a(n)
physical property
500
If the density of water is 1.00 g/mL and lead is 11.342 g/mL..........will lead float or sink? Why?
Sink because the density of lead is much larger than the density of water.
500
What is the drawing called that depicts all electrons around the atom.
Bohr's Diagram
500
How many valence electrons are in Titanium?
2
500
What's the difference between an element and a compound?
Mixtures The composition of a mixture is variable. Each of its components retains its characteristic properties. Its components are easily separated. Compounds The relative proportions of the elements in a compound are fixed. The components of a compound do not retain their individual properties. It takes large inputs of energy to separate the components of a compound.
500
Explain how you could find out whether or not an unknown liquid is water.
measure the density. 1.00 g/mL boil it. water evaporates at 100 degrees Celsius freeze it. water freezes at 0 degrees Celsius