Chemical/Physical Changes
Fireworks exploding
Chemical
Which of the following is NOT a property of a chemical reaction:
combustibility
reactivity
density
toxicity
density
Which two types of matter are pure substances?
elements and compounds
This type of property allows us to describe matter using measurements and numbers.
Quantitative property
A block of aluminum occupies a volume of 15.0 mL and weighs 40.5 g. What is its density?
2.7 g/mL
roasting marshmallows
Chemical
A chemical property describes the ability of matter to _________ with another substance to form one or more new substances.
react
Mixtures that have the same composition throughout are___________________.
homogeneous
heterogeneous
Homogeneous
True or False, the following are examples of quantitative properties: texture, smell, colour, and state.
False. These are qualitative properties.
What is density?
The mass per unit of volume of an object.
Which of the following properties can change during a physical change?
Reactivity
Shape
pH level
flammability
Shape
________________ describes the ability of a material to catch fire and burn in air.
Combustibility
To form brass, copper and zinc combine, but do not chemically bound. Brass is a(n) _________________
element
compound
heterogeneous mixture
solution
Mixture
Which of the following is a quantitative physical property?
a) Sulphur has a yellow colour
b) mercury is liquid at room temperature
c) Ketchup is 50 000 times as viscous as water
c) ketchup is 50 000 times as viscous as water
Which of the following items will float on water?
vegetable oil d=0.92
baby oil d=0.83
dish soap d=1.03
vegetable oil and baby oil because their densities are less than 1.0g/mL
What happens to atoms after a chemical change?
They link up in different ways
What makes iron rust and our blood red?
Oxygen
Beryllium appears on the periodic table with the symbol Be. It may bond with sulphur to form the compound BeS. Beryllium is a(n):
element
compound
heterogeneous mixture
solution
Element
True or false: malleability is a qualitative property.
True
How would you determine the volume of an irregularly- shaped rock?
Put the rock in a graduated cylinder filled with water and see how much water is displaced.
Give an example of something that goes through both a chemical and physical change.
Answers may vary
What is the difference between an endothermic and an exothermic reaction?
Endothermic - energy is absorbed
Exothermic - energy is released
In the lab, Rock is using a substance that has the same composition throughout. He separates the substance into a liquid and solid using a physical process. Based on the description, the substance is a(n)_____________.
Solution
With which types of scientific instruments could one make quantitative observations?
Give three examples.
Possible answers are:
thermometers
graduated cylinders
rulers
scales
A graduated cylinder containing 50 mL of water has a mass of 70g. As you put the object into the graduated cylinder, the water rises to 80mL and the total mass increases to 90 g. What is the mass, volume, and density of the object?
Mass = 20g
Volume = 30mL
Density = 0.67g/mL