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Questions in chemistry

[Terjawab] 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?

[Terjawab] 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.

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

[Terjawab] 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.

[Terjawab] Besides glycerol, what three other molecules make up a triglyceride?

[Terjawab] The first astronauts to travel to distant stars might use what to achieve light speed instead of engines?

[Terjawab] Can you give examples of carbon in our nonliving environment?

[Terjawab] Nitrogen gas (\(N_2\)) and hydrogen gas (\(H_2\)) combine to form ammonia (\(NH_3\)). Which equation correctly represents this reaction? A. \(N + H \rightarrow NH\) B. \(2N_2 + H_2 \rightarrow 3NH_3\) C. \(2NH \rightarrow N + 3H_2\) D. \(N_2 + 3H_2 \rightarrow 2NH_3\)

[Terjawab] Can you identify the fourth most abundant element in the universe?

[Terjawab] What is one result of a chemical change? A. Energy is created. B. A new material is formed. C. Materials change from one state to another. D. Elements are permanently destroyed.