1: what is the smallest part of a compound called?

mixture

element

atom

molecule

2: one molecule is made of two or more bonded together.

nuclei

mixtures

atoms

compounds

3: which of the following is a pure substance that can't be separated by physical means, and can't be decomposed into other substances by chemical means?

compound

molecule

mixture

element

4: a substance that cannot be separated physically is called a

heterogenous mixture

homogenous mixture

pure substance

mixed substance

5: which term below represents a pure substance that can be separated chemically, but cannot be separated physically, that is made up of two or more different atoms?

mixture

element

molecule

chemical bond

6: water is formed when two hydrogen atoms bond to an oxygen atom.

the hydrogen and the oxygen in this example are different

1: What is the smallest part of a compound called?

mixture

element

atom

molecule

2: One molecule is made of two or more bonded together.

nuclei

mixtures

atoms

compounds

3: Which of the following is a pure substance that can't be separated by physical means, and can't be decomposed into other substances by chemical means?

compound

molecule

mixture

element

4: A substance that cannot be separated physically is called a substance

heterogenous mixture

homogenous mixture

pure substance

mixed substance

5: Which term below represents a pure substance that can be separated chemically, but cannot be separated physically, that is made up of two or more different atoms?

mixture

element

molecule

chemical bond

6: Water is formed when two hydrogen atoms bond to an oxygen atom.

True

The hydrogen and the oxygen in this example are different __True.

answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form() .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.