Which of these redox reactions is spontaneous as written? (a)ag + cu2+ → ag+ + cu (b)al + h+ → al3+ + h2 (c)h2 + al3+ → h+ + al (d)na + k+ → na+ + k

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

Which statement best describes the function of enzymes?

Which answer tells the reason the earth’s climate is getting warmer? too many animals are becoming extinct. large glaciers are melting in antarctica. the earth is moving closer to the sun. driving cars gives off gases that trap heat in the atmosphere.