Phase Changes
Water vapor changes to liquid water during which process?
(1) dissolving (3) evaporation
(2) melting (4) condensation
Condensation
In which situation is a chemical reaction occurring?
(1) a ball hits a car (3) ice melts
(2) a nail rusts (4) a glass breaks
(2) Nail Rusting
What is the density of an object that has a mass of 120g and a volume of 6 cm3?
The density is 20 g/cm3
If a substance has a ph of 3.5, would this be an acid or a base?
Acid (Strong Acid)
Which equipment will best separate a mixture of iron filings and black pepper?
(1) magnet (3) triple-beam balance
(2) filter paper (4) voltmeter
1) Magnet
A wet shirt is put on a clothesline to dry on a sunny day. The shirt dries because water molecules:
(1) gain heat energy and condense
(2) gain heat energy and evaporate
(3) lose heat energy and condense
(4) lose heat energy and evaporate
2- Gain heat energy and evaporate
Which is evidence that a chemical reaction took place?
A) dent in car door
B) ice meting
C) water evaporating
D) bubbles
D) Bubbles
Calculate the density of an object that has a mass of 180 grams and a volume of 18 cm3
10 g/cm3
If I have a substance that has a ph of 7, would this be considered an acid, base, or neutral?
Neutral
What piece of equipment would you use to measure mass?
A) Graduated Cylinder
B) Stop watch
C) Triple Beam Balance
D) Ruler
C) Triple Beam Balance
During which phase change is heat energy absorbed by a substance?
(1) liquid to gas (3) liquid to solid
(2) gas to solid (4) gas to liquid
Liquid to Gas
List two observations or pieces of evidence that would suggest a chemical reaction is taking place.
1. bubbles
2. color change
3. smoke/heat
4. new substance
5. smell
Calculate the density of a cube that has a length of 2cm's and has a mass of 160 grams.
20 g/cm3
Which is a property of an acid?
A) Slippery
B) Tastes bitter
C) Tastes sour
D) None of the above
C) Tastes sour.
What piece of equipment would I use to measure volume?
A) Triple Beam Balance
B) Ruler
C) Graduated Cylinder
D) Scale
C) Graduated Cylinder
What phase change takes place when a solid changes to a gas?
A. evaporation
B. condensation
C. freezing
D. sublimation
D. Sublimation
A strong acid is added to a beaker containing a piece of zinc metal. As a result, zinc chloride is formed and hydrogen gas is released. This is an example of:
(1) a chemical reaction (3) photosynthesis
(2) a physical change (4) evaporation
1) Chemical Reaction
If I place 4 different substances in a graduated cylinder, which object would be the most dense?
A) 1.4 g/cm3
B) 0.8 g/cm3
C) 1.8 g/cm3
D) 1.9 g/cm3
D) 1.9 g/cm3
What is one action that can be taken to reduce acid rain?
1) Burn more fossil fuels
2) Cut down trees
3) Reduce fossil fuels
4) Increase Manufacturing
3) Reduce fossil fuels
If I have a graduated cylinder with 10 ml of water and I place a rock into the cylinder and the water goes up to 25 ml, what is the volume of the rock?
15 ml
Is heat added or released when a liquid changes to a solid?
Heat is released
The process of gathering information by using your senses is called:
(1) observation (2) variable
(3) hypothesis (4) control
1) Observation
If I were to place an object with a density of 2.4 g/cm3 into a graduated cylinder. Would it sink or float on a liquid with a density of 2.8 g/cm3?
It would float
List 2 properties of a base:
Slippery
Bitter
Corrosive
If I pour milk into a glass container, which property of milk can I measure using the cup?
A) Mass
B) Length
C) Volume
D) Density
C) Volume