7th Grade Unit Test

Which of the following is correct?

• Protons (positive); Neutrons (negative); Electrons (neutral)

• Protons (positive); Neutrons (neutral); Electrons (negative)

• Protons (negative); Neutrons (neutral); Electrons (positive)

• Protons (neutral);

  Neutrons (positive);

  Electrons (negative)

Tags

atomic structure

This particle has mass but no charge.

• Valence Electrons

• All Electrons

• Protons

• Neutrons

• The Nucleus

Tags

atomic structure

What is the mass number of an element that has 45 Neutrons and 35 Electrons?

Tags

atomic structure

Match the subatomic particle with its charge

• Proton

• Positive

• Neutron

• Negative

• Electron

• Neutral

Tags

atomic structure

What is the center of the atom called?

• Nucleus

• Electron cloud

• Energy level

• Neutron

Tags

atomic structure

How many Hydrogen atoms are in 4 H₂O? a.______ How many Oxygen atoms? b.______

• 8

• 4

• 1

• 2

• 7

Tags

atomic structure

counting atoms

How many elements are in 2 C₆H₁₂O₇ (a)​​​ (a)  

How many C (b) ​ (b)  

How many H (c) ​ (c)  

How many O (d) ​ (d)  

How many TOTAL atoms (e) ​ (e)  

• 3
• 12
• 24
• 14
• 50
• 7
• 6
• 25
• 52
• 60

Tags

counting atoms

How many Sulfur's are in Al₂(SO₄)₃

• 4

• 3

• 7

• 12

Tags

counting atoms

Match the element to the number of atoms it has. 2 Al(C₂H₃O₄)₂

• Hydrogen

• 12

• Aluminum

• 8

• Oxygen

• 2

• Carbon

• 16

Tags

counting atoms

Coefficients in chemical formulas...

• are found at the beginning of a formula and multiply just the first atom

• are found at the end of a formula and multiply EVERYTHING!

• are found at the end of a formula and multiply only the elements inside the parentheses.

• are found at the beginning of a formula and multiply EVERYTHING!

Tags

atomic structure

counting atoms