Why is it important to repeat the steps or an experiment multiple time

A neutral atom has the atomic number 16 and a mass number of 33; how many protons, neutrons, and electrons are found within the atom?

How many moles of calcium are in a 351 kg sample?

Which of the following combinations of information would allow you to calculate concentration in ppmv? Check all that apply.

What kind of cells animals have

Phosphoric acid, H 3 P O 4 (aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH and the concentrations of all species in a 0.100 M phosphoric acid solution.

What is meant by polar molecule?

Which kind of dating can be used to determine the exact age of the rock and which kind of carbon dating is used to compare the ages of rocks?

Calculate the density of an object with a mass of 30g and volume of 6cm^3

What happens when light from the sun passes through any type of matter? the light slows down. the light speeds up. most of the light is absorbed. most of the light is reflected.

What is the chemical name for Fe (HCO3) 2