Test - Matter Flashcards
1
Q
- matter in which particles are free to move in all directions until they have spread evenly throughout their container is a _________.
A
gas
2
Q
- in which phase of matter are the molecules of the substance farthest apart from each other?
A
gas
3
Q
- a flask containing molecules of gas A and a seperate flask containing molecules of gas B are both at the same temperature. Gases A and B must have equal __________.
A
average kinetic energies
4
Q
- fragrance of a flower
A
PP
5
Q
- burning popcorn and making water
A
CC
6
Q
- how many grams of NaC1O3 are needed to make a saturated solution in 100 g of water at 90*C? (picture shown)
A
180 grams
7
Q
- Iron and oxygen react to form rust. what will happen to the mass of the rust compared t
o the mass of the iron and oxygen before the reaction? explain why this would occur. (think back to our popcorn lab!)
A
law conservation of matter
states that matter can not be created or destroyed even in a chemical change
8
Q
- A piece of wood that measures 3 cm x 6 cm x 4 cm has a mass of 80 g. A) what is the density of the wood? B) if the density of water is 1 g/mL, What the word float in the water? Explain.
A
Given-
v: 346=72cm3
m: 80g
9
Q
- graduated cylinder has 33.5 mL of water. A piece of metal is added to the water and the new volume is now 46.2 mL. If the metal has a mass of 16.25 g, what is the density?
A
given=
v: 46.2-33.5=12.7
m: 16.25 g
10
Q
- Name one similarity between compounds and homogeneous mixtures and one difference.
A
different: compound is chemically combined + mixture is physically
11
Q
- explain how salt dissociates in water. be specific.
A
- H+ of water attract Cl-
- O-2 of water attract Na+
- attractive force pulls ions away from the crystal
- water surrounds each ion and continues until all ions are separated
12
Q
bonus-
A baby swimming pool measures 900 cm long by 300 cm wide by 175 cm deep. What mass of the water(in metric tons) does the pool contain when filled?
A
given:
v= 900350175=55,125,000 cm3
d= .997 g/cm3
