UNIT 5:1
a gas turning into a liquid is an example of what?
condensation
at what temperature does water boil?
100 degrees Celsius
what is another scientific word for heat
energy
True or False: Color change is only a chemical property
false
what happens to the atoms of a substance when they loose energy
they get closer together
boiling of water, bursting of a balloon, and crumpling a piece of paper are examples of what?
physical change
if you add heat to a chemical reaction, what happens to the rate of the reaction?
it speeds up
how do you calculate the density of a substance
d=m/v
what does not change even though the volume changes of an object
the density
what happens to the molecules of an object when energy is added to it
they speed up
When 16 grams of Tin and Hydrogen Fluoride react, they must produce how many grams of product?
16
During a chemical reaction, matter cannot be __________ or created
Destroyed
Adding heat to a reaction would_______
Cause it to speed up
As the temperature in a chemical reaction ________the reaction rate ______
rises, rises
Which of the following is NOT an example of a chemical change? color change, shape change, bubbles formed, heat created
shape change
A change in which one or more substances are converted into new substances is a
chemical change
how do chemical changes differ from physical changes?
Physical changes produce no new substances and chemical changes do
mixture of 70% pink paint and 30% blue paint. What occurs when you mix the paint?
A physical change occurs, since only the physical properties of the paint change
you mix two liquids in a tube, and gas bubbles appear at the surface. What type of changes are most likely taking place? How do you know?
Chemical change because a gas formed
Carbon and Oxygen react to form Carbon Dioxide. What are the reactants?
Oxygen and Carbon
bubbles are a property of what type of change?
chemical change
what creates a new substance: physical or chemical
chemical
during a chemical reaction, the number of atoms in the reactants should.............
be the same after the reaction
what is it called when you put two liquids together and they form a solid
percipitate
what is this new unit about
chemical and physical changes of matter