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WorksheetsTest rev: Matter, Properties, & Chemical Reactions
Total questions: 39
Worksheet time: 35mins
Breaking a chemical bond _____.
absorbs energy from the surroundings
creates energy that did not previously exist
releases energy into the surroundings
uses up energy that then no longer exists
An exothermic reaction _____.
absorbs thermal energy
needs energy to be added constantly in order to continue
needs more energy to break the chemical bonds than is released when products form
releases thermal energy
The following are examples of physical properties except ____.
ability to dissolve in water
ability to react with oxygen
density
shape
____ is a physical property
Density
Flammability
Combustibility
Oxidation
A characteristic of matter that allows it to change to something new is a ____.
chemical change
chemical property
physical change
physical property
When a sliced apple turns black and mushy, it is a ____.
change of state
chemical change
) physical change
thermal change
The total mass of the reactants equals the total mass of the products because atoms are rearranged but are not created or destroyed in the reaction.
law of conservation of mass
law of conservation of energy
law of conservation of the environment
The ability to react with oxygen is a ______ property.
physical
chemical
The melting point of silver is a ____.
chemical change
chemical property
physical property
physical change
Common Physical Properties
Viscosity
Melting/Freezing Point
Boiling Point
Solubility
Hardness
Conductivity
Density
Color
Odor
State
Texture
Malleability
Reaction with acid
Reaction with another substance
Combustibility (reaction with oxygen)
Ability to rust
Common Chemical Properties
Viscosity
Melting/Freezing Point
Boiling Point
Solubility
Hardness
Conductivity
Density
Color
Odor
State
Texture
Malleability
Reaction with acid
Reaction with another substance
Combustibility (reaction with oxygen)
Ability to rust
An example of a chemical property is ____.
ability to be attracted by a magnet
ability to react with acid
boiling point
solubility
Flammability is a(n) property.
chemical
physical
personal
Which of the following is NOT a physical property of matter?
density
flammability
melting point
solubility
The ability of a pond to freeze over in winter is a _____.
chemical change
chemical property
physical change
physical property
When a log burns in a fire, _____.
a physical change has occurred
mass is gained
mass is lost
new substances are formed
Titanium reacts less with oxygen than most metals do. This is a ____.
chemical change
chemical property
physical change
physical property
A dish holding a solution of sugar and water is left in a sunny spot. After a few days, the solution has disappeared and a white residue remains on the dish.
Has a physical change or a chemical change taken place?
chemical change
physical change
Which are evidence of a chemical reaction?
Select all answers that apply
gas production
formations of bubbles
fizzing
temperature change
If there are 4 hydrogen atoms and 2 oxygen atoms in the reactants, how many atoms must be in the products?
4 hydrogen and 4 oxygen
2 hydrogen and 2 oxygen
4 hydrogen and 2 oxygen
2 hydrogen and 4 oxygen
When coal burns carbon dioxide is produced from the carbon in coal and the oxygen in air. Which of these is the best evidence that a chemical reaction occurs when coal burns?
The shape of the coal changes
Oxygen is present
A new substance is produced
Coal is made up of more than one element
In a ___________change, a substance changes into a different (new) substance.
The process by which one or more substances change to produce one or more different substances (new substance).
Chemical Process
Reactant
Chemical Reaction
A chemical reaction or process that releases heat.
Endothermic
Exothermic
a process in which atoms rearrange to form new substances
CH4
How many CARBON atoms are in this compound?
1
2
3
4
CH4
How many HYDROGEN atoms are in this compound?
1
2
3
4
People have used gunpowder as an explosive for hundreds of years. Gunpowder is a mixture of three different substances: potassium nitrate, charcoal, and sulfur. When these substances are burned together, they release a large amount of heat and gas. In the past, gunpowder was used in muskets and cannons, but today, it is mainly used in fireworks.
In this chemical reaction, charcoal is the _________.
REACTANT
PRODUCT
To help relieve pain during a dental visit, a dentist may give a patient nitrous oxide. Nitrous oxide is made in factories by carefully heating ammonium nitrate. At 170°C, ammonium nitrate breaks down and forms a mixture of nitrous oxide gas and water vapor. After the mixture is collected, the water vapor is separated from the nitrous oxide gas.
In this chemical reaction, water is a ___________.
REACTANT
PRODUCT
Which of the following IS a physical change?
Getting a haircut
Rusty metal
A compound
sour milk
the starting materials in a chemical reaction
Products
Reactants
Starters
Enders
The substances listed on the right side of a chemical equation are the
Yields
Reactants
Products
Precipitates
The smallest particle of an element; made of electrons, protons, and neutrons
Atoms
Elements
Molecules
Products
Which of the following is a sign that a chemical reaction has occurred?
Change in texture
Change in size
Change in shape
Change in color
Which of the following is an example of a chemical change?
Boiling water
Breaking glass
Melting ice
Burning wood
