Which of the following is not an accurate description of chemical reactions?

a. the rates of chemical reactions can vary.
b. during chemical reactions, energy can be released or used up.
c. chemical reactions that take in energy never need a source of energy to start.
d. during chemical reactions, bonds can be broken or formed.
don't answer unless you know for sure that it is right. if i fail this, then i have to redo highschool. (i'm in pennfoste4)

Which animal group is the largest and contains more species from all the other living groups combined? is it mammals or

Which blood cell spend most of their time in the lymphatic system?

Consider the motion of the balloon and its air contents in terms of momentum. in step 1 above, the total momentum of the balloon and its contents was zero. recall that momentum = mv. both the balloon and the air inside it had a velocity of zero and therefore the total momentum was zero. now think about what happened when the air escaped from the balloon. a certain mass of air accelerated in one direction. in order to keep the total momentum of the system zero, the balloon itself (which has mass) had to accelerate in the opposite direction. use this scenario to you explain why the soda can rotates when the water squirts out of the escape holes. what was your hypothesis concerning the water-filled can? according to your data, do you think your hypothesis was correct? (be sure to refer to your data when answering this question.) summarize any difficulties or problems you had in performing the experiment that might have affected the results. describe how you might change the procedure to avoid these problems. give at least one more example of newton's third law in everyday life.