What is the total mass of Kr-42 remaining in a 20-mg sample after 48.8 hours?

(1) 2.5 mg

(2) 5.0 mg

(3) 10 mg

4) 20 mg

How are chemical compounds named from their respective formulas?

Newton's first law is best described as A) The law of inertia B) The law of reaction C) The law of acceleration D) The inverse square law

For a given sample of ch3oh, the enthalpy change during the reaction is 82.3 kj. how many grams of methane gas are produced?

which of the following could be classified as a substance that has the physical property of magnetism?

Name a soluble compound that contains silver ions.

What material was added to powdered rock during tuttle and bowen's experiments?

Which of the following statements is true? Selected Answer: D. At least two of the above statements (A-C) are true. Answers: A. Ions are formed by adding or removing protons or electrons. B. Scientists believe that solids are mostly open space. C.

Does anybody know which element from the periodic table that has 19 electrons and 24 neutrons, for atomic charge.

Given the following reaction 2Al + 3Cl2 - -> 2AlCl3 How many grams of AlCl3 aluminum chloride will be produced from 125 g of Al and 125 g of Cl2?

Potassium chlorate (used in fireworks, flares, and safety matches) forms oxygen and potassium chloride when heated. KClO3 (s) → KCl (s) + O2 (g) [unbalanced] What mass of oxygen gas is formed if 26.4 g of potassium chlorate decomposes completely?