A negative △H means an exothermic reaction.

True

False

What causes temperatures in the summer to be higher than temperatures in the winter? A. The greenhouse effect, which raises temperatures on Earth, takes place during the summer months only. B.

Which of the following statements about catalysts is true?

An 80-kg patient has the flu and his temperature increases from 37°C to 39°C: c = 3 470 J / (kgK). How much extra heat do the chemical reactions in his cells have to generate to cause this temperature change? (6 x 105 J)

Hydrofluoric acid, hf (aq), cannot be stored in glass bottles because compounds called silicates in the glass are attacked by the hf (aq). sodium silicate (na2sio3), for example, reacts as shown below.

Ta, Os, Rh the periodic table these create what metal, non metal, gas or metalloid

The Carbon family element in period 4

Generally speaking, which group would have the lowest electronegativity values in a period? Group 1 Group 3 Group 14 Group 17

Radioactive decay is a spontaneous process. occurs when an unstable nucleus loses energy. does not require any input of energy. all of the above

What effect does a hypotonic solution have on a red blood cell?

A negative △H means an exothermic reaction. True False