Astudent makes the following two claims about chemical reactions:
the result of a chemical reaction is immediately and clearly visible.
a chemical reaction transforms one or more substances into new substances.
do you agree or disagree with these statements? explain your reasoning.

I would agree with the second one, not the first. You can't always see the chemical reaction, and it isn't always sudden. But the second claim is true. 

Ahigh energy (high speed) particle (alpha or beta or neutron) are shot at the target;

1. why does the same side of the moon always face earthc.the rotational period of the moon is equal to one revolution around earth2. which is greater the moons period of rotation or its period of revolution  b.the moons revolution period around earth3.what was the major accomplishment of the apollo missions  c.sending the first human into space4. which of these space missions involved the deployment of lunar roversa. voyager 15. which scientists are going to explore next on kepler-186fd. evidence of existence of life6.which mission is not going to explore the outside of the solar  systemb.safir7.which technology limit the future of space explorationb. scientist must first develop certain technologies before missions can be completed.