An atom that contains six protons six neutrons and six electrons has a mass of approximately

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As a star increases in brightness, which value becomes smaller? A. density B. magnitude C. temperature D. luminosity

What is the molecular formula of a compound given the molar mass of the compound is 62.18 g/mol and the empirical formula is c2h7?

Which of the following is the best definition of radiation? A. the transfer of heat by electrical currents B. the transfer of heat by currents within a liquid or gas C. the transmission of heat across matter D.

Magnesium is a light metal with a density of 1.74 g/cm3. What volume is occupied by 1.35 kg of magnesium?

Calculate the density of a rectangular solid that has a mass of 25.71 g, and its dimensions are 2.3 x 4.01 x 1.82 cm.

When the metal sample reacts with acid, the gas evolved will be collected over water; the gas is said to be "wet".

Solid iron (II) sulfide reacts with aqueous hydrochloric acid HCl to produce hydrogen sulfide gas H2S and aqueous iron (II) chloride.

How are mixtures compounds and elements alike?

The percentage of carbon dioxide in the atmosphere has increased in the last century and is a concern for the environment as it increases the greenhouse effect. Give one possible explanation for the increase of carbon dioxide in the atmosphere