What is the most basic building block of matter?

Question 2 options:

the atom

the quark

the electron

the proton

How many atoms of chlorine are in 1.00 mol of chlorine gas

How can radiocarbon dating be used to measure the age of once living things?

Which of the following is most clearly an example of a physical change? A. A solid dissolves when added to a liquid B. A solution color when something is added C. Two liquids produce heat when mixed together D.

At 120.0 c the pressure of a sample of nitrogen is 1.07 atm. what will the pressure be at 205 c assuming constant volume?

You need to produce a buffer solution that has a pH of 4.87. You already have a solution that contains 10. mmol (millimoles) of acetic acid. How many millimoles of sodium acetate will you need to add to this solution? Ka for acetic acid is 1.8*10-5.

What set of techniques can be used for separating mixtures? a. condensation, dialysis c. electroporation, transformation b. grinding, boiling d. synthesis, reflux

How do you make good grades?

Magnesium (24.48g) reacts with hydrochloric acid (xg) to produce hydrogen gas (2.04g) and magnesium chloride (96.90g). How much hydrogen chloride was used in the reaction?

What is it important for scientists to be able to remove DNA from an organism

How did scientists discover that Earth's outer core is liquid?