Which are the reactants in the following reaction?

2 Mg + O2 - --> 2MgO

a) Mg and O

b) Mg and MgO

c) MgO

d) O and MgO

Calculate the atomic mass for copper using the weighted average mass method. Express your answer using two decimal places and include the appropriate units.

Which group on the periodic table contains only metals? A. the second group B. Along the top C. Along the bottom D. The last group

Describe the difference between a polar and a nonpolar covalent bond. give and explain an example of each type of bond.

A sample of calcium carbonate, caco3 (s) absorbs 45.5 j of heat, upon which the temperature of the sample increases from 21.1 °c to 28.5 °c. if the specific heat of calcium carbonate is 0.82 j/g·˚c, what is the mass (in grams) of the sample?

If the rate of evaporation is equal to the rate of condensation, the system is in a state of dynamic equilibrium, which cannot be disturbed. TRUE FALSE

Acids A) are generally proton donors B) produce H + ions in solution C) are electron pair acceptors D) may include all of these characteristics

3.011 x 10^23 atoms F in grams

What would you use if you needed to determine the density of an object? balance and graduated cylinder balance and scale scale and spectroscope

What are two forms of friction that oppose the motion of a moving car

How are models related to theories and hypotheses