Chemistry

An atom’s mass number is 210 and its atomic number is 85. How many neutrons does the atom have? 

• 85
• 125
• 210
• 295

How many total atoms are represented in the formula CO ₃? 

• three
• four
• five
• six

The diagram below shows what happens during the formation of a compound. The diagram shows two substances joining together to form a third substance.

Which of these substances is a compound?

• A

• B

• C

• both B and C

What can group numbers on the periodic table help you determine?

• the number of neurtrons
• the number of total electrons
•  the number of protons
• the number of valence electrons

Which group of elements would NOT react with another element because they have eight electrons in their outmost shell? 

• Group 1 - Alkali Metals
• roup 7 - Transition Metals
• roup 16 - Oxygen Family
• Group 18 - Noble Gases

The portion of the diagram labeled 4 is 

• the nucleus
• an electron
• a proton
• a neurtron

Belinda makes a sugar solution, as shown below.
How much sugar did Belinda dissolve in the water? 

• 9 grams
• 11 grams
• 13 grams
• 17 grams

Ted wants to know the average atomic mass of calcium. He knows that the letters Ca stand for calcium. He found the entry for calcium, Ca, in Period 4 of the periodic table. The diagram below shows this
Which of the following numbers should Ted identify as the average atomic mass of calcium, Ca? 
 
entry. 

• 4
• 20
• 60.078
• 40.078

The portion of the diagram labeled 3 is

• the nucleus
• an electron
• a proton
• a neutron

Some compounds are classified as acids or bases. The pH scale shows how acidic or how basic these compounds are. The lower the pH, the more acidic a compound is. The higher the pH, the more basic it is. Sodium hydroxide, a compound commonly
 found in drain cleaners, has a pH of 13.
Which of these phrases describes sodium hydroxide?

• highly acidic
• highly basic
• slightly acidic
• slightly basic