When does a change in energy occur?

1. In some physical changes, but not all.

2. In every physical change, but not in a chemical change.

3. In every chemical or physical change.

Muddy water is what type of solution

Which part of the factory is most similar to the nucleus of a living cell

What constitutes only 16% of earth's volume but 32% of earth's mass

An unbalanced chemical equation for the reaction of boron fluoride with lithium sulfite is shown below. BF3 + LI SO3 → B2 (SO3) 3 + LIF What is the coefficient of lithium fluoride in the balanced chemical reaction? 1

How many grams of iron (Fe) will be produced if you start with 3.65 liters of carbon monoxide gas (CO) at STP? Fe2O3 + 3 CO - - > 2 Fe + 3 CO2 if you could explain how you got the answer, that would be great!

A pump contains 0.5 l of air at 203 kpa. you draw back on the piston of the pump, expanding the volume until the pressure reads 50.8 kpa. what is the new volume of air in the pump? 0.2 l 1.0 l 2.0 l 4.0 l

How can there be snow near a giraffe's home This is actually science so yeah

If a sealed syringe that contains some gas in heated in which direction will the syringe plunger move

Use the drop‑down menus to label the statements as either true of false. Dichloromethane is flammable. true false Methanol is flammable. Concentrated sulfuric acid is corrosive. 10% sodium carbonate solution must be used in the fume hood.

What is the process all rocks are continuously in during which that can change into other types of rocks