Ninety-nine percent of all the matter that can be observed in the universe exists as

A. gases.

B. plasmas.

C. liquids.

D. solids. Reset Selection

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An ion of zinc, Zn, has 28 electrons, 30 protons and 33 neutrons. What is its mass number

A helium-filled balloon contains 130 mL of gas at a pressure of 0.97 atm. What volume will the gas occupy at standard pressure?

What are the variables of Boyle's law? pressure and number of molecules of gas volume and temperature pressure and temperature volume and number of molecules of gas pressure and volume

An atom: 1) is the smallest whole unit of matter 2) can form one or more elements 3) is the smallest whole unit of matter with the properties of a specific element 4) all of the above

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A neutral isotope has 45 neutrons and 36 electrons. Identify the element symbol of this isotope and determine the mass number and number of protons. element symbol: mass number: number of protons:

Write a nuclear equation for the alpha decay of 23892U. 23892U → 0-1e + 23893Np23892U → 10n + 23792U23892U → 42He + 23490Th23892U → 0-1e + 23891Pa23892U → 0+1e + 23891Pa

You want to test how the mass of a reactant affects the speed of a reaction. Which of the following is an example of a controlled experiment to test this?

How do you balance phosphorus, potassium and nitrogen in water?

Which of these crystals is softest: P4, ZnS, CuCl, SiO2