Who first used the word "atomos" to describe the smallest unit of a substance? thomson democritus bohr schrödinger?

What is true of all mass and volume of all floating objects

How is the number of covalent bonds an atom can form determined? By the number of valence electrons. By the number of nuclear protons. By the total number of electrons. By the charge of the polyatomic ion. Description

What causes the transfer of energy from one object to another? A. Differences in pressure B. Differences in temperature C. Low albedos D. High albedos

Most of the daily radiation that you are exposed to originates from which of the following sources? rocks and soil X-rays nuclear power plants carbon-14

If you start with a higher pressure of reactant, the equilibrium constant will be larger?

When 10.7 g of Al are reacted with 42.5 g of HCl, what volume of H2 will be produced at 47 C and 725 mmHg? Formula: 2Al+6HCl=2AlCl3+3H2

Increasing the temperature increases the rate of a many reactions by:

2A balloon filled with helium occupies 20.0 L at 1.50 atm and 25°C. How many moles of helium will there be in the balloon at STP? A. 22.4 moles B. 1.12 moles C. 0.0446 moles D. 0.893 moles E. 1.23 moles F. 4.55 moles

1. Which has a larger radius Ca atom or Ca+2 ion? 2. Which has a greater radius F atom or F - ion? 3. Which is the correct way of understanding the trend for Ionic radius Vs. Atomic radius?

For which of the following activities might you want to hire a chemist? A. examining the structure of plant cells B. building a fence C. building a wood storage shed D.