True or false?

When sodium and chlorine combine and bond, a molecule is formed.

A certain reaction is exothermic in the forward direction. The reaction has more moles of gas on the product side.

Which of these particles has the greatest mass? (1) alpha (3) neutron (2) beta (4) positron

Both suspensions and colloids are heterogeneous mixtures. Define and characterize a colloid, listing similarities and differences to a suspension. Give several examples of colloids.

What's is the percent composition by mass of oxygen in magnesium oxide, Mg0

A chemist is using 341 milliliters of a solution of acid and water. If 15.8% of the solution is acid, how many milliliters of acid are there?

How are chemical formulas of binary ionic compounds generally written? a cation on left, anion on right b anion on left, cation on right c roman numeral first, then anion, then cation d subscripts first, then ions?

Given a fixed amount of gas held at constant pressure, calculate the volume (in L) it would occupy if a 3.50 L sample were cooled from 90.0oC to 30.0oC.

Which of the following is not required for osmosis to occur? View Available Hint (s) Which of the following is not required for osmosis to occur? selectively permeable membrane water concentration gradient cellular energy

The volume of 1 mole of o2 gas at T=273k P=1atm is? A 6.02 x 10^-23 ml B 760 L C 22.4 L D 2.24 L E 224 L

There are two stable isotopes of bromine. Their masses are 78.9183 and 80.9163 amu. If the average atomic mass of bromine is 79.9091 amu, what is the natural abundance of the heavier isotope? percent abundance of 81Br __%