What year was the hole in the ozone layer detect in the antarctica?

To find the percent by mass of a compound if you are given the formula, divide the molar mass of that element in one mole of the compound by the total molar mass of the compound, multiplied by 100.

The law of reflection states that if the angle of incidence is 80 degrees, the angle of reflection is ___ degrees.

Which of the following best describes the relationship between the Earth and the sun? (A The Earth gets no light from the sun, and is illuminated by the moon. B When it's night time, your part of the Earth is facing away from the sun.

Where do scientists think the abundance of water on Earth came from?

Enter the symbol of a sodium ion, Na+, followed by the formula of a sulfate ion, SO42-. Separate the ions with a comma only-spaces are not allowed

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