8th, 3rd 9 Week Midterm Review

What is a compound?

• A substance is made of two or more elements chemically bonded together in a specific ratio or proportion. More than one kind of atom.

• A substance is cannot make elements chemically bonded together in a specific ratio or proportion.

• A substance is made of one elements chemically bonded together in a specific ratio or proportion.

What type of bond is formed with 4 hydrogens and 1 carbon atom?

• Mixture

• Element

• Compound

• Molecule

Which of the following are compounds? Select all that apply.

• Au-Gold

• CH4-Methane

• Brass

• Stainless Steel

• CO2-Carbondioxide

Which of the following is a mixture?

• Au - Gold

• CH₄ - Methane

• Brass

• Stainless Steel

• Bromine

Which model best represents a change that results from adding thermal energy to a substance in a jar?

• A. Liquid to Solid

• B. Liquid to Gas

• C. Gas to Liquid

• D. Gas to Solid

This is what a molecule of Ammonia looks like. Ammonia is used as fertilizer, plastics, and dyes.  The dark images represent the Nitrogen atom and the white images represent the Hydrogen atoms.   What is the chemical composition of Methane?  

• 1 Nitrogen and 3 Hydrogens

• 2 Hydrogens 2 Nitrogens

• 1 Nitrogen and 2 Hydrogens

What does Hydrogen Peroxide contain if it is a compound?

• one or two elements chemically combined

• Two or more elements chemically combined

• No elements chemically combined

How would you describe the breakdown of a compound?

• It may split down into its individual compounds or atoms

• Being not broken down into its individual compounds or atoms

• Being broken down into its individual compounds or atoms

When looking at this image of Helium and Oxygen, what is the difference between an atom and a molecule?

• When one atom combine, It's called a molecule and an atom is a basic unit of matter

• When two or more combine, It's called a molecule and an atom is a basic unit of matter, one element (one type of atom)

• When two elements combine, It's called a molecule and an atom is a basic unit of matter, one element.

What are all of these compounds made up of?

• Two or more elements

• One or two elements only

• One element only