Chemistry Star Review

An atom has 25 protorn, 30 neutrons, and 25 electrons. What is the charge of the atom's nucleus?

• +25

• +30

• -25

• -30

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

• 6

• 12

• 24

• 3

Tags

NGSS.MS-PS1-1

The chemical equation shown below represents a reaction that produces fuel for certain cars. Which substance represented in this equation is classified as an element?

• CO

• H₂O

• CO₂

• H₂

Tags

NGSS.MS-PS1-1

An atom of a certain element has 36 protons, 36 electrons, and a mass number of 84. At room temperature this element is a very stable gas. How many neutrons are in this atom?

• 36

• 84

• 48

• 72

an atom with atomic number 6 would have how many protons 

• 6

• 12

• 3

• cannot be determined 

Tags

NGSS.MS-PS1-1

In which region would the nonmentals be found?

• 1

• 4

• 3

• 5

What determines where an element is located on the periodic table?

• its atomic mass

• its atomic number

• its number of electrons

• they're arranged alphabeticaly 

2H₂ + O₂ ----> 2H₂O What is the product?

• ------>

• 2H₂O

• 2H₂+ O₂

Tags

NGSS.MS-PS1-5

The positive particles of an atom are called:

• electrons 

• positrons 

• neutrons 

• protons 

all matter is made of what 

• energy 

• atoms 

• electrons 

• compounds 

Tags

NGSS.MS-PS1-1