Midpoint Chemistry

How many atoms of oxygen are in this one molecule?

• 1

• 2

• 3

Tags

NGSS.MS-PS1-1

How many total atoms are in this one molecule?

• 1

• 2

• 3

Tags

NGSS.MS-PS1-1

What does the chemical symbol K represent?

• Sodium

• Potassium

• Oxygen

• Hydrogen

The diagram above shows the repeating groups of atoms that make up two samples. Will the properties of the two samples likely be the same or different? (Examples of properties are smell, color, and the temperature at which a substance melts.)

• The properties will likely be different because the repeating groups of atoms that make up each sample are different.

• The properties will likely be different because there are more repeating groups of atoms in Sample 2.

• The properties will likely be the same because the repeating groups of atoms that make up the two samples have the same number of atoms.

• The properties will likely be the same because the repeating groups of atoms that make up the two samples have two of the same types of atoms.

Tags

NGSS.MS-PS1-1

Do the following substances share all of the same properties?

• Yes, they share all of the same properties.

• No, they do not share all of the same properties.

Tags

NGSS.MS-PS1-1

What does a represent?

• Proton

• Neutron

• Electron

Tags

NGSS.MS-PS1-1

Gold is an example of a(n) 

• pure element

• pure compound

• pure mixture

What is the atomic number of this element?

• 20

• 60

• 40

• 41

Tags

NGSS.MS-PS1-1

What does c represent?

• Proton

• Neutron

• Electron

Tags

NGSS.MS-PS1-1

What is the midpoint of a chemical reaction?

• The point where reactants are completely converted to products

• The point where the reaction rate is highest

• The point where half of the reactants have been converted to products

• The point where the reaction reaches equilibrium