The ratio of protons to neutrons may vary but in a neutral atom the number of protons = the number of

a. neutrons

b. electrons

c. positrons

d. protons outside the nucleus

1. Which of the following is not part of Dalton's atomic theory? A. Atoms cannot be divided created or destroyed B. The number of protons in an atom is its atomic number C. In chemical reactions, atoms are combined, separated, or rearranged. D.

sodium bromide equation

Na2CO3 + CaCl2 → 2NaCl + CaCO3 How many grams of CaCl2 can be produced from 0.210 moles of Na2CO3?

Explain the reaction of non-metals with oxygen

What is the tail of a comet made of? A. Heat B. Asteroids C. Melted materials D. Solar wind

Describe the preparation of 2.00 L of 0.100 M glycine buffer, pH 9.0, from glycine and 1.00 M NaOH.

Reducing the volume of a contained gas by one third, while holding temperature constant, causes pressure to A. be decreased by two thirds. B. be increased by two thirds. C. be decreased by one third. D. be increased by one third

What is the percent mass/volume of a solution having a mass of 65.00 grams and a volume of 600ml

This element has 3 electrons in its Lewis dot structure and is in the 3p orbital section.

In an exothermic reaction, energy is transferred from a. the reactants to the surroundings. c. one reactant to another. b. the surroundings to the reactants. d. the container to the chemicals.