Which of these are physical changes in matter chech all that apply

Boiling water

A pencil being sharpened

Exploding dynamite

Freezing water

Rotting cheese

Match each element to the number of electrons in its valence shell. Match Term Definition Carbon (C) A) Two Hydrogen (H) B) Six Magnesium (Mg) C) One Oxygen (O) D) Four

Identify the option below that exemplifies how the intrinsic chemical properties of a reactant affect the rate of reaction. Select the correct answer below: When exposed to air, sodium reacts completely overnight, whereas iron barely reacts.

four gases were combined in a glass cylinder with these partial pressures:3.5 atm N2,2.8 atm, 0.25 atm At and 0.15 atm He. What is the mole fraction in the mixture? What is the mole fraction of Ar in the mixture?

Como um acido pode ser identificado? quais sao suas caracteristicas?

What happens to the particles on a dissolving process?

How does an atom with too few neutrons relative to protons undergo radioactive decay? * by converting proton to a neutron by converting a neutron to a proton by emitting an alpha particle

What is the chemical formula for the compound formed between sodium and iodine?

8. Write a balanced chemical equation showing how you could prepare each of the following salts from an acid-base reaction: KNO3, NaBr, and Cas.

Is calcium carbonate a compound element or mixture?

Why do covalent bonds not involve the transfer of electrons