Which statement is true about the activity series? (5 points)

elements are listed according to their reactivity.
elements are listed according to their atomic number.
elements are listed according to their atomic radius.
elements are listed according to their atomic mass.

which of the following statements is true about nuclear fusion? (5 points)

it occurs in the sun.
a heavy atom is split.
it can be controlled easily.
an electron is lost by the atom.

the table shows four reactions.

reactionsreaction equation
1 c3h8 + 5o2 → 3co2 + 4h2o
2 c6h12o6 + 6o2 → 6co2 + 6h2o
3 agno3 + nacl → agcl + nano3
4 2fe + o2 → 2feo

which of the above reactions is an example of a combustion and also a synthesis reaction? (5 points)

1
2
3
4

The activity series is an arrangement of elements in order of reactivity.

The activity series is an arrangement of elements in order of reactivity. The activity series shows the order in which chemical elements will displace each other in a replacement reaction.

A nuclear fusion is said to have occurred when two light nuclei come together to yield a heavier nucleus with the emission of a tremendous amount of energy. Nuclear fusion occurs in the sun.

A combustion reaction refers to the reaction of a substance with oxygen. A synthesis reaction is a reaction in which two or more substances come together to form a new substance. A combustion reaction which is also a synthesis reaction is 2Fe + O2 → 2FeO.

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Correct statements are given below:

1) In activity series elements are listed according to their reactivity.

2) Nuclear reaction in which low atomic nuclei fuse to form a heavier nucleus with the release of energy. Nuclear fusion reaction occurs in the sun.

3) C3H8 + 5O2 → 3CO2 + 4H2O is the example of a combustion reaction.

4) 2Fe + O2 → 2FeO is the example of synthesis reaction. In synthesis reaction is a type of reaction in which two reactants combine to form a single product.

neutrons are in the middle of the atom and the electrons, which are much smaller.

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