8th Grade Semester 1 Exam Review

Which of these items is made up of one or more molecules?

• Gold

• Hydrogen

• Salt

• Neon

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which atomic particle has no charge?

• proton

• neutron

• electron

• nucleus

Which group has the most valence electrons?

• Group 1

• Group 9

• Group 16

• Group 18

When do atoms form a covalent bond?

• when they share electrons

• when they give up electrons

• when they accept additional electrons

• when electrons remain with the same atoms

Which of these is a property of a base?

• tastes sour

• reacts with metals

• reacts with carbonates

• feels slippery

Protons are __________. Neurons are __________. Electrons are __________.

• positive, neutral, negative

• negative, positive, neutral

• neutral, negative, positive

• neutral, positive, negative

• positive, negative, neutral

Heidi is using the periodic table to make predictions about chemical reactions. She knows that sodium is a reactive metal. Which element is most likely to form a molecule with sodium that includes one ionic bond?

• Fluorine (F)

• Potassium (K)

• Oxygen (O)

• Aluminum (Al)

A substance that can be easily separated is called a __________.

• compound

• element

• mixture

• base

Which type of matter consists of 2 or more substances that are chemically combined?

• compound

• mixture

• element

• atom

Tags

NGSS.MS-PS1-5

Most atoms gain, lose, or share electrons to end up with how many valence electrons?

• 0

• 8

• 12

• 16