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Questions in chemistry

[Answered] Water molecules attract one another to form what kind of bonds?

[Answered] Similar organisms that are not related are an example of: A. Natural selection B. Convergent evolution C. Divergent evolution D. Common ancestor

[Answered] How many moles are present in a 24.5 gram sample of [tex]K_2Cr_2O_7[/tex]?

[Answered] Hess's law ____. A. makes it possible to calculate [tex]\Delta H[/tex] for complicated chemical reactions B. states that when you reverse a chemical equation, the sign of [tex]\Delta H[/tex] does not change C. determines the way a calorimeter works D. describes the vaporization of solids

[Answered] The mass of 2 cm\(^3\) of gold is 38.6 grams. Find the density of the gold.

[Answered] What volume of hydrogen is necessary to react with five liters of nitrogen to produce ammonia? \[ \text{Reaction:} \quad N_2 + 3H_2 \rightarrow 2NH_3 \]

[Answered] Which list includes three types of chemical formulas for organic compounds? A. covalent, metallic, isotopic B. covalent, metallic, molecular C. empirical, structural, isotopic D. empirical, structural, molecular

[Answered] Which term is defined as a measure of the disorder of a system? A. Heat B. Kinetic energy C. Entropy D. Activation energy

[Answered] What happens when you touch cold ice with your warm hand? A. Heat only transfers from the ice to your hand. B. Heat only transfers from your hand to the ice. C. Heat transfers from the ice to your hand and from your hand to the ice. D. Heat does not transfer between the ice and your hand.

[Answered] What is true about the element francium (Fr, atomic number 87)? More than one can be true. A. It has seven valence electrons. B. It is likely to form ionic bonds. C. It is in Period 7. D. It is a nonmetal. E. It is a metal.