Question

Can someone help me, please?

Chemical Equations, Reactions, and Bonding in Relation to th



3. All the following are signs of a chemical reaction, except
A. a change in energy.
B. a release of gas.
C. a change in color or odor.
D. a change of state.

4. Which of the following is true regarding the inner transition elements?
A. These include the lanthanides and actinides and do not have f sublevels.
B. Their valence electrons can be located in both s and f sublevels.
C. They occupy the d block of the periodic table.
D. These include all elements in groups 3–12.

Answer 1

QUESTION 3:

There are signs that you can look for to helpyou determine whether a chemical reaction has taken place. You’ll wantto be on the lookout for:

1. Color changes

2. Precipitation of a solid

3. Energy changes (in other words, heat or light is absorbed orreleased)

4. Odor changes

5. Gas release

The right answer is D. a change of state.

Answer 2

That is not true at all. Sorry for being rude but for 3 the answer is b because there is not always a release of gas. It is not a because energy is used to start the reaction to get over the hump. For number 4 it is c i can not really explain because this is just what i know.