2. An element's atomic number is the A. number of protons in an atom's nucleus. B. mass of the atom. C. weight of the atom. D. sum of the protons and neutrons in an atom.

An alkyne C-H bond absorbs at higher wave number than an alkene C-H bond. What does this tell you about the strength of these two bonds? Multiple Choice The alkyne C-C bond is stronger. The alkene C-C bond is stronger.

How many moles of CO2 is needed to fill an 80.0 L tank to a pressure of 150.0 atm at 27.0°C?

Geologic evidence shows that Earth's tectonic plates can move thousands of kilometers across the Earth's surface. These movements A. do not change the Earth's surface at all. B. occur gradually over millions of years. C. occur due to human activity.

How many atoms are in this formula? 4 O2 A 2 B 4 C 6 D 8

Plants grow in many different shapes and sizes. Much of their shape depends on an internal structure that is composed of carbon-containing molecules such as cellulose and lignin.

A sample of bismuth weighing 0.687 g was converted to bismuth chloride by reacting it first with HNO3, and then with HCI, followed by careful evaporation to dryness. The mass of the bismuth chloride obtained was 1.032 g.

When 1 g of sodium chloride (NaCl) is placed in 100 g of water, a solution results. Once the solution is prepared, water is now considered what part of the solution?

1. How is pressure affected as depth increases? 2. As the sun heats the surface of the oceans, two layers of water result. What separates the layers? 3. How is temperature affected when? (a) the depth increases (b) the latitude increases 4.

Are nails in a jar with water a chemical change

What is the molarity of a solution composed of 4.73 g of potassium iodide (KI) dissolved in enough water to make 0.169 L of solution? Answer in units of M.