Can someone me, ?
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.

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.

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )