Is vinegar a mixture or a pure substance?

If a covalent bond consists of a hydrogen atom and an oxygen atom, which atom will have a partial negative charge ( -) ? Which atom will have a partial positive charge ( +) ?

In gel electrophoresis, DNA fragments move across a gel. What causes them to move?

A high school chemistry teacher needs to dilute her stock of 18.0 M H2SO4 solution for a lab. How many mL of water must she add to 10.0 mL of 18.0 M H2SO4 solution to prepare a 0.50 M H2SO4 solution?__mL

The following properties are of metal lithium. Classify them as chemical or physical. 1.) Reacts violently with chlorine to form a white solid. 2.) Burns in oxygen with a bright red flame 3.

Why are standards needed for measured quantities?

What is the number of lone electron pairs on the central atom of a molecule having a linear molecular geometry, such as clf2-?

Look carefully at Kw expression. If the [H+] changed from [1 x 10-7] to [1 x 10-4], the [OH-] will: A. remain the same B. increase C. decrease

What on a bird, besides it's feet, is chemically similar to scales? A. beak B. feathers C. wings

What are the carbon (C) and oxygen (O) in carbon dioxide (CO2) ? (select all that apply) A) Atoms B) Compounds C) Elements D) Molecules

What does the chemical formula C3H2O, tell about a molecule of the compound it represents?