What does the the release or absorption of energy indicate?

A. Physical Change

B. Chemical Change

C. Physical and chemical changes

D. Neither physical nor chemical changes

Which of the following is equal to the number of particles in 36 grams of carbon-12? B. 3 moles A. 3:1 molar mass C. 3:1 mole ratio D. 1:3 molar volume

A calcium atom has two valence electrons. Do you think it will lose two electrons or gain six electrons to obtain an octet in its outermost electron shell? Explain

Based on the graphs below, which of the following substances has the highest specific heat capacity? Assume each experiment began with 200 g of the substance at 100°C mixed with 500 g of water at 20°C.

14Carbon has an atomic number of 6, but has 8 neutrons. How many electrons are present in each atom? A.) 6 B.) 8 C.) 14 D.) some have 6 and some have 8

Circle the letter of the best answer. 1. Which statement is true? a. Mole ratios limit the number of significant figures in a calculation. b.

The balanced equation for the generation of sugar from sunlight water and co2 is

Isotopes of the same element have different ... A. Positions on the periodic table b. atomic numbers C. Mass number

How many moles of O2 are needed to make 1.98 moles of SO3

How many protons are in the nucleus of isotopes L?

What is the empirical formula for a compound that contains 38.77% Cl and 61.23% O?