Chemistry Review

Atom and Periodic Table Review

How do you use the periodic table squares to find the number of protons, neutrons, and eletrons?

• Protons=Atomic Number

• Electrons=protons

• Neutrons= Atomic Mass - Protons

Why do we do atomic mass - protons to find neutrons?

• The total mass of an atom is composed of just the protons and neutrons.

• In order to find the neutrons all we have to do is take out the protons.

• (Don't forget to round the mass to the nearest whole number)

What are the charges of the subatomic particles? (subatomic just means smaller than an atom)

• Protons are Positive

• Neutrons are neutral

• Electrons are negative

Where are the subatomic particles located in the structure of an atom?

• Protons are in the nucleus

• Neutrons are in the nucleus

• Electrons are moving around outside the nucleus

How are solids liquids are gases different?

• The particle speed increases as you go from solid to gas

• Solids have the lowest particle speed, the particles are stuck close together and only vibrate in the same place. The amount of vibration is the temperature of the object

• The particles in liquids have more freedom to move around, particles are slipping and sliding past one another

• Gasses have particles that are bouncing around with little to no restraint.

What is the difference in a chemical change and a physical change?

• Chemical change makes a new substance

• Physical change can change a physical property but it is still the same substance

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What are the 5 physical change evidences?

• Change of color

• Change of texture

• Change of temperature

• Change of shape

• Change of State of Mater

What are the 5 evidences that a chemical change has occured?

• Unexpected change in color

• Unexpected change in temperature

• Combustion/burning

• Precipitate forming

• Bubbles/Gas produced

Multiple Choice

The atomic number of an element is determined by the _________ of ________ in the nucleus.

• protons, neutrons

• number, electrons

• electrons, protons

• number, protons

Multiple Choice

How many neutrons are in an Calcium atom?

• 20

• 40.08

• 60

Multiple Choice

What is the atomic mass for this element?

• 6

• 12.0107

• 6.0107

• 18.0107

Multiple Choice

An electron is located ...

• in the nucleus.

• outside the nucleus.

Multiple Choice

What 2 elements make up water?

• Hydrogen and Carbon

• Carbon and Oxygen

• Hydrogen and Oxygen

• Oxygen and Helium

Multiple Choice

This symbol indicates a _______.

• neutron

• proton

• electron

Multiple Choice

What does the nucleus of an atom contain?

• Electrons and neutrons

• Protons and neutrons

• Electrons and protons

• DNA

Multiple Choice

Which of these is a property of metals?

• Malleable

• Very brittle

• Can't conduct electricity

Multiple Choice

A group of elements that are shiny, conduct heat and electricity well is called

• Metals

• Non-metals

• Metalloids

Multiple Choice

If an atom has 3 electrons, how many protons does it have?

• 1

• 2

• 3

• 4

Multiple Choice

The number of electrons in a Lithium atom is

• 3

• 4

• 6

• 7

Multiple Choice

The atomic number of oxygen is

• 8

• 15.9994

• 16

• O

Multiple Choice

Which of the following is an example of a physical change, and why? 

• Fire burns in fireplace, because a new substance is formed. 
• Clothes are folded, because there is a color change. 
• A mirror is broken, because there is a change in shape/size.
• cookies are baked, because there is a change in temperature

Multiple Choice

Which of the following is evidence of a chemical change?  

• Change in state
• No new substance is formed
• Bubbles forming
• Change in shape

Multiple Choice

Which of the following is a chemical change?

• Iron rusting 
• Glass breaking
• Clothing ripping
• Hair cut

Multiple Choice

Matter takes up space. What property of matter is this?

• mass

• volume

• density

• melting point

Multiple Choice

How many protons, electrons, and neutrons are in the element silver?

• 47 protons, 46 electrons, 61 neutrons

• 61 protons, 46 electrons, 61 neutrons

• 47 protons, 47 electrons, 61 neutrons

Multiple Choice

The average speed of molecules in a substance is called

• thermodynamics

• heat

• temperature

Multiple Choice

Define sublimation.

• solid to liquid

• solid to gas

• gas to solid

• liquid to gas

Multiple Choice

When water forms outside of a can of soda, the liquid is coming from

• Inside the can

• Water vapor in the air

Multiple Choice

What happens to the water molecules when water at 24º C is cooled to 0º C and freezes?

• The molecules become less organized

• The molecules move faster

• The molecules break apart

• The molecules move more slowly.

Multiple Choice

A pot of water is placed on a hot stove. Small bubbles begin to appear at the bottom of the pot. The bubbles rise to the surface of the water and seem to pop or disappear. What are the bubbles made of?

• Air

• Gaseous oxygen and hydrogen

• Gaseous water/water vapor

• None of the above

Multiple Choice

As temperature increases, what happens to volume?

• it increases

• it decreases

• it stays the same

Multiple Choice

How does a thermometer work? As the temperature increases the liquid in the thermometer takes up:

• more space

• less space

• stays the same

Multiple Choice

When gaseous water molecules lose __________, they become a liquid.

• energy

• heat

• motion

• all of the above

Multiple Choice

Using the information provided, determine how many electrons the a Boron atom contains.

• 2.5

• 5

• 6

• 10.81

Multiple Choice

What is a valence electron?

• an electron that is found in the outermost orbital of an atom. 
• an electron found in the innermost orbital of an atom.
• an electron found in the middle orbital.

Multiple Choice

What is the atomic number of this atom?

• 4
• 5
• 9
• none of the above

Multiple Choice

What is the atomic mass of this atom?

• 1

• 3

• 4

• 7

Multiple Choice

What charge does an electron have?

• Negative
• Positive
• Neutral
• Contrated

Multiple Choice

In the atom diagram shown, E is pointing to

• An electron
• a proton
• a neutron
• the nucleus

Multiple Choice

Which of the following is described as the basic unit of matter?

• Element
• Atom
• Molecule
• Compound