Robert has 4 grams of a substance and jill has 10 grams of the same substance. which of the following statements is true?

a. jill's sample will boil at a higher temperature than robert's sample.

b. jill's sample will melt at a lower temperature than robert's sample.

c. jill's sample will weigh more than robert's sample.

d. jill's sample will be denser than robert's sample.

What can be added to the examples section of each circle? endothermic: ice melting into water, and a heat pack becoming warm exothermic: a glow stick glowing, and fireworks exploding endothermic: ice melting into water, and an instant ice pack turning cold exothermic: fireworks exploding, and gasoline burning endothermic: a glow stick glowing, and a heat pack becoming warm exothermic: an instant ice pack turning cold, and ice melting into water endothermic: gasoline burning, and an instant ice pack turning cold exothermic: ice melting into water, and an instant ice pack turning cold

Is this a single replacement reaction or there is no

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '