Exploring Elements, Compounds, and Mixtures

How many known types of elements are there currently?

• 118

• 200

• 150

• 100

What do we call a molecule formed by two or more atoms of the same type?

• Compound

• Element

• Diatomic Molecule

• Mixture

Which of the following is a representation of a compound?

• A mixture of different elements

• Two atoms of the same type combined

• Two different types of atoms chemically combined

• A single type of atom

What is the formula for nitrogen dioxide?

• N2O2

• NO

• N2O

• NO2

What do we call a molecule formed by two different types of atoms?

• Mixture

• Element

• Diatomic Compound

• Monoatomic Molecule

Which of the following represents a mixture of elements?

• A compound and an element chemically combined

• A single type of atom

• Two different types of elements not joined together

• Two different types of atoms chemically combined

What is the chemical formula for ammonia?

• NH3

• NH4

• N3H

• N2H3

How many hydrogen atoms are in a molecule of glucose (C6H12O6)?

• 6

• 24

• 12

• 18

What does the subscript number in a chemical formula represent?

• The type of element

• The number of molecules

• The number of atoms of that element

• The total mass of the molecule

In the formula for acetone, how many carbon atoms are there in total?

• 5

• 4

• 3

• 2