Which of the changes are physical changes

Which compound is a hydrocarbon?

What is the correct formula for sodium nitrate

Who first proposed that an atom might be the smallest form of matter, and why wasn't this proposition made into a theory by the scientific minds of the time?

Which describes a climate effect on the rate of weathering? Cold climates favor mechanical weathering. Chemical reactions occur slower at higher temperatures. Lower precipitation levels lead to more chemical reactions.

Nonpolar solvents will most easily dissolve solids That are

Given the propane molecule C3H8 (g) ! a) What is the balanced equation for the combustion of propane in O2? (20 pts.) b) What is the standard enthalpy change ΔH0 for the reaction at 25°C? (20 pts.

Which of the following happens during a chemical change? Check all of the boxes that apply. One atom or more changes into atoms of another element. New substances with different properties are formed. Solids, liquids, or gases may form.

Which has more inertia: a kilogram of cotton balls or a kilogram of gold?

Democritus who lived in greece during the fourth century b. c suggested that matter is made up of tiny particles that cannot be divided. what did he called them

What is the root mean square of carbon iv oxide at 27°C?