Group 1 elements in periods 2-7 all react with water, but with increasing reactivity from period 2 through 7. This because the Li has 2 valence electrons, and Fr has 7 valence electrons.
O True
O False
PLEASE HELP PLEASE IM TAKING A TEST

f=ma newton

f=100x2.5=250n

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.