The amount of mass, in products and reactants, before and after a chemical reaction remains the same. true or false

If gases like carbon dioxide and methane make up less than 1% of the total atmosphere, why is it important for scientists to monitor changes in percentages of these gases?

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?