How many protons, neutrons, and electrons are in a lithium atom?

• 3 protons, 3 electrons, and 4 neutrons

• 3 protons, 4 electrons, and 3 neutrons

• 3 protons, 3 electrons, and 3 neutrons

• 4 protons, 3 electrons, and 4 neutrons

Tags

NGSS.MS-PS1-1

Which element has chemical properties most similar to that of potassium (K)?

• Ca

• Na

• C

• Ba

Tags

NGSS.HS-PS1-1

In a covalent bond, electrons are...

• shared

• transferred

• always split between two atoms

• lost

In an ionic bond, electrons are...

• shared

• transferred

• always split between two atoms

• lost

Which of the following combinations will produce the largest current?

• 120 V and 12 Ohms

• 150 V and 10 Ohms

• 100 V and 25 Ohms

• 180 V and 90 Ohms

What is true for the chemical reaction shown?

• It is balanced because the mass of the reactants is equal to the mass of the products.

• It is unbalanced because the mass of the reactants is greater than the mass of the products.

• It is unbalanced because the mass of the reactants is less than the mass of the products.

• It is balanced because the number of reactants is equal to the number of products.

Tags

NGSS.HS-PS1-7

What coefficients will correctly balance the equation shown?

• 1, 2, 2

• 2, 2, 2

• 2, 3, 2

• 3, 2, 3

The half-life of Phosphorous-32 is 14.3 days. What fraction of a 100 g sample would be left after 42.9 days?

• 1/2

• 1/4

• 1/8

• 1/16

Tags

NGSS.HS-PS1-8

A saturated solution...

• can accept additional solvent to be dissolved in the solute

• can accept additional solute to be dissolved in the solvent

• has the maximum amount of solvent that can be dissolved in the solute

• has the maximum amount of solute that can be dissolved in the solvent

Which combination below will create the fastest chemical reaction?

• a block of baking soda and vinegar at 20 degrees Celsius.

• powdered baking soda and vinegar at 50 degrees Celsius.

• a block of baking soda and vinegar at 50 degrees Celsius.

• powdered baking soda and vinegar at 20 degrees Celsius.

Tags

NGSS.HS-PS1-5