Atoms in Chemical Formulas, Law of Conservation of Mass
Metals, Nonmetals, and Metalloids
Physical and Chemical Changes
Balanced and Unbalanced Forces
Elements, Compounds, and Mixtures
100
7 carbon atoms, 14 hydrogen atoms, and 1 oxygen atom
100
Pb and Al would be classified as....
Metals
100
Which of the following are examples of chemical changes?
Select TWO correct answers.
rust forming on a car door
water evaporating out of a cup
burning a log
dissolving sugar into water
cutting a piece of paper
Rust forming on a car door and burning a log.
100
The forces acting on a skateboarder moving at a
constant velocity along a sidewalk are shown in
the figure below. Which of the following is the net force on the skateboarder?
0N
100
True or False? Elements can be broken down into simpler substances.
False. Elements can not be broken down into simpler substance. It is already in its purest form
200
A student is studying chemical reactions in class and wrote the equation below.
Cu + 2AgNO3 → 2Ag + Cu(NO3)2
The student is asked to determine how many different elements are present in the equation.
There are 4 elements in this equation.
200
Students are learning about metals, nonmetals, and metalloids in class. Complete the sentence by entering the correct answer in the box.
An element that does not reflect light, breaks easily, and is an insulator would be classified as a
A nonmetal
200
What type of change occurs when a silver spoon tarnishes?
Chemical change.
200
Which of the following are indicators that an object is experiencing balanced forces? Choose TWO answers.
An object is changing its direction.
An object is moving at a constant speed.
An object is stationary.
An object is speeding up.
An object is slowing down.
An object is moving at a constant speed.
An object is stationary.
200
Which of the following are considered pure substances?
Choose TWO correct answers.
Element
Compound
Homogeneous mixture
Heterogeneous mixture
Element and compound
300
Phosphoric Acid
300
Can conduct heat and electricity but is not a great conductor, can be flexible or brittle, and can be shiny or dull. Is this properties of metals, nonmetals, or metalloids?
Properties of Metalloids
300
When ice is heated, is it a physical or chemical change?
It is a physical change.
300
Choose if whether the following statement is balanced force or unbalanced unbalanced force.
A hammer coming down on a nail.
Unbalanced.
300
Which of the following examples most closely represents an element?
A salad made of lettuce, tomatoes, cucumbers, and dressing.
A brick wall made from many identical (same) bricks.
A brick wall made from many identical (same) bricks.
400
How many total atoms of Carbon are in a molecule with the formula of CH3COCH3
There are 3 Carbon atoms.
400
How would the elements in blue be classified?
Metalloids
400
Which of the following is evidence of a chemical change occurring when vinegar is mixed with baking soda?
The solution gets colder
The solution becomes clear
Bubbles form and a gas is released
The baking soda dissolves completely
Bubbles form and a gas is released
400
The weight of the rock is 76 N. An upward force
of 106 N is exerted on the rock. What is the net
force acting on the rock?
30 N upward
400
What is a compound?
Two or more elements chemically combine
Can only be separated by breaking chemical bonds
500
What is the Law of Conservation of Mass?
Matter cannot be created or destroyed, only changed.
500
How can element X and Y be classified?
Element X is a metal and Element Y is a metalloid
500
Jason and Maria have been tasked to create real-world examples of matter undergoing physical and chemical changes. Is this following example a chemical change or a physical change?
JB is trying to melt sugar to make dessert. He left the sugar on the stove too long and it began to turn black and give off an odor.
A chemical change.
500
A 2000 kg car is pulling a 1000 kg trailer. The car’s engine exerts a 6000 N force to move the car
and the trailer. In addition, the car and the trailer each experience a 1000 N frictional force as they
are being pulled, as represented below. What is the magnitude (size) of the net force on this system?
4000N
500
How could you separate the sugar from the water in kool-aid?
Evaporation