Add and Subtract

How do you find the net force of this image.

• Add up all the arrows

• Add a green arrow and the orange arrow.

• Subtract all the arrows.

• Add the green arrows and subtract the orange arrow.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

In a chemical reaction, the total mass of the reactants is 50g. After the reaction, the total mass of the products is 48g. What is the mass of the gas released during the reaction?

• 2g

• 48g

• 50g

• 0g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A scientist adds 5g of salt to 100g of water. What is the total mass of the solution?

• 95g

• 100g

• 105g

• 110g

Tags

NGSS.MS-PS1-5

If you subtract the atomic number of Helium (2) from the atomic number of Oxygen (8), what is the result?

• 6

• 10

• 4

• 8

• 2 m/s^2

• 0.5 m/s^2

• 5 m/s^2

• 10 m/s^2

Tags

NGSS.MS-PS2-2

A biologist subtracts 3ml of a solution from a 10ml sample. How much solution is left?

• 7ml

• 3ml

• 10ml

• 13ml

In an experiment, a student adds 3g of a substance to a container and then subtracts 1g. What is the final mass of the substance in the container?

• 2g

• 3g

• 4g

• 1g

Tags

NGSS.MS-PS1-5

A chemist has a solution with a pH of 7. If they add a substance that decreases the pH by 2, what is the new pH?

• 5

• 9

• 7

• 2

If you subtract the number of protons in Carbon (6) from the number of protons in Neon (10), what is the result?

• 4

• 16

• 6

• 10

A physicist adds 20J of energy to a system and then subtracts 5J. What is the total energy change in the system?

• 15J

• 25J

• 5J

• 20J