In which time Period did Copernicus introduce his heliocentric or sun centered theory

1. A. D. 1200-1400

2. A. D. 1400-1600

3. A. D. 1600-1800

4. A. D. 1800-2000

Which of the following will favor a spontaneous change? 1.+ΔH. 2.-ΔH. 3.+ΔS. 4.-ΔS.

Why are gases more easily compressed than solids and liquids

Calculate the molarity of a solution that contains 0.175 mol of zncl2 n exactly 150 ml of solution.

What is the charge of a hypothetical ion with 85 protons and 87 electrons?

Is a solution a homogeneous or heterogeneous mixture

A laboratory experiment requires 250 millimeters of water for boiling. It also requires 100 millimeters of water for a cooling process.

Which set of procedures and observations indicates a chemical change? A) Ethanol is added to an empty beaker and the ethanol eventually disappears. B) A solid is gently heated in a crucible and the solid slowly turns to liquid.

If 100 grams citric acid react with 100 g baking soda how many grams of carbon dioxide?

What state of matter undergoes changes in volume most easily? a. solidb. liquidc. gasd. frozen

What was the result of the atomic theory?