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Questions in chemistry

[Done] What volume, in liters, of a 2.00 M KCl solution contains 2.5 kg of KCl? Molar mass of KCl = 74.55 g/mol

[Done] A sample of hydrogen gas has a volume of 8.56 L at a temperature of 0°C and a pressure of 1.5 atm. Calculate the number of moles of hydrogen present in this gas sample. Assume that the gas behaves ideally.

[Done] What is the pH of a solution with a concentration of [tex]2.4 \times 10^{-5}[/tex] molar [tex]H_3O^+[/tex]? Show or explain the work used to solve this problem.

[Done] Which of these statements is correct with respect to pH? A) The pH of a solution remains constant with increasing basicity. B) The pH of a solution decreases gradually with increasing basicity. C) The pH of a solution increases gradually with increasing basicity.

[Done] Give four examples of properties of nonmetals that are exactly the opposite of the properties of metals.

[Done] Can you give examples of carbon in our living environment?

[Done] Converting carbon to nitrogen by increasing the number of protons from 6 to 7 and decreasing the number of neutrons from 8 to 7 is an example of what type of decay?

[Done] The concentration of greenhouse gases in the atmosphere can and does change. Would conditions on Earth be worse if the concentration of gases increased or if it decreased? Use Figure 4-4 to explain your answer.

[Done] Why are we called carbon-based life forms?

[Done] Imagine that you're doing an experiment that requires you to smell the odor of a chemical solution in a beaker. Which procedure should always be followed? A. Wave the fumes toward your nose with your hand. B. You should never smell chemicals. C. Hold the beaker directly beneath your nose. D. Remove your safety goggles before smelling the chemicals.