A mixture of uneven distribution and easy separation is:

- heterogeneous

- a solution

- homogeneous

- a standard

Calculate the amount of heat needed to boil 183. g of ethanol (CH3CH2OH), beginning from a temperature of 33.9°C. Round your answer to 3 significant digits. Also, be sure your answer contains a unit symbol.

How can you tell whether one glass of water has more thermal energy another, identical glass of water?

What is the molar mass of Na (C2 H3 O2) ?

Which radioisotope is used in dating geological formations? (1) I-131 (2) U-238 (3) Ca-37 (4) Fr-220

A) How many moles of O2 are required for the complete combustion of 2.2 g of C3H8 to form CO2 and H2O? b) A 65.25 g sample of CuSO4•5H2O (M = 249.7) is dissolved in enough water to make 0.800 L of solution.

Which molecule is a source of energy, a store of energy, and can mix with water?

How many atoms will you find in 2.0 moles of he?

An atom of nitrogen has seven electrons. Which diagram correctly respresents the arrangement of these electrons?

A farmer has concerns about the nitrogen levels in her soils. What can she do to ensure that the nitrogen bacteria are replenished in the soil? Question 6 options: Clear cut the area surrounding the field.

The changing of gas to liquid