8.1 🧠 Chemical reactions video

Which of the following is not an example of a chemical reaction?

• Rusting Iron

• Burning Wood

• Boiling Water

• Rotting Food

Tags

NGSS.MS-PS1-2

Which of the following is not true about coefficients in a balanced chemical equation?

• They are numbers written in front of reactants or products

• They are usually whole numbers.

• They describe the highest whole number ratio of the amounts of all reactants and products.

• They are not usually written if the value is 1.

Which observation is NOT physical evidence that a chemical reaction has occurred?

• There is an odor change

• A solid id no longer magnetic

• A solid Melts

• A solid Changes color

Tags

NGSS.MS-PS1-2

Which of the following is NOT true about balancing chemical equations?

• Subscripts should never be changed to balance the equation.

• Coefficients are written in their lowest possible ratio.

• Coefficients are changed to make the number of each element equal on both sides.

• Subscripts are changed to make the number of each element equal on both sides.

Tags

NGSS.MS-PS1-5