Is mixing salt and pepper physical change or chemical change?

How many molecules of co2 are equivalent to 112g of CO2

Neglecting friction, if a pendulum bob has 100 joules of kinetic energy at the bottom of its swing, how much potential energy does it have at the top of its swing? A) 0 J B) 50 J C) 100 J D) 200 J

A small amount of acid is added to a buffered solution. what will happen

What are the three struggles astronauts would face in long term space travel?

How do liquids and gas transfer heat?

When a single 1-gram piece of zinc is added to 3 M hydrochloric acid at 25°C, the reaction is slow. Which procedure would most likely increase the rate of the reaction if the reaction were repeated? A. using 1 gram of powdered zinc B.

Which accurately describes development? A. changing while growing B. growing larger over time C. decreasing the number of cells D. increasing the sizes of cells

A design team has come out with four different plans for building a bridge across a small stream. What is the quickest and most economical way of picking the right plan?

Is a gas that is produced by the ultraviolet radiation in the air in the vicinity of welding operations?

How much MnO2 (s) should be added to excess HCl (aq) to obtain 295 mL of Cl2 (g) at 25 °C and 735 Torr?