Science 8 Chemistry Unit Test

A material is said to be ductile if it

• Can be pulled out, or drawn into a long wire.

• Can be hammered or rolled into flat sheets and other shapes.

• Can transfer heat of electricity to another material.

• A mixture of a metal with at least on other element.

In chemical reactions, what does the law of conservation of mass mean?

• The total mass of the reactants is greater than the total mass of the products.

• The total mass of the reactants is less than the total mass of the products.

• Matter is not created or destroyed.

• It is simply a question of mind over matter.

Tags

NGSS.MS-PS1-5

A chemical equation that shows the same number of each kind of atom on both sides of the equation is said to be.

• Balanced

• An incomplete reaction

• Unbalanced

• A replacement reaction

Tags

NGSS.MS-PS1-5

Which subatomic particle has a negative charge?

• Protons

• Electrons

• Neutrons

• Nuclei

What is the mass number of an atom which contains 21 electrons, 21 protons, and 24 neutrons?

• 21

• 22

• 42

• 45

Which is an example of a homogeneous mixture?

• Salad

• Iron & sulfur

• A sugar solution

• Oil & water

One example of a physical change is

• Burning paper

• Rusting metal

• Baking cookies

• Dissolving salt in water

Tags

NGSS.MS-PS1-4

Which of these statements about a group/family/column of the periodic table is true?

• The elements have a wide range of properties

• The elements have the same atomic number

• The elements have similar properties because of the number of valence electrons

• The elements have the same atomic mass

Which of the following is NOT an example of a chemical change?

• Gas burning on a stove

• Salt dissolving in water

• Rust forming on an iron fence

• Using electricity(energy) to break down water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

From an element's location in the periodic table, you can predict

• Its chemical name

• Its properties

• Its chemical symbol

• When it was discovered