Chemistry - Basics

Question 1

An ______ is a substance that cannot be broken down into smaller substances

Answer 1

Element

Question 2

____ can be built up to form chemical _____

Answer 2

Elements compounds

Question 3

There are ____ naturally occurring ____ that bond together to create millions of substances

Answer 3

92 elements

Question 4

What elements are a horse made up of…

Answer 4

Carbon, hydrogen, calcium phosphorous, oxygen nitrogen

Question 5

Around ____ other elements are present in horses, in very small quantities known as ______

Answer 5

14

Trace elements

Question 6

An element is composed of tiny particles known as _____

Answer 6

Atoms

Question 7

An ____ is the smallest component of an element. It consists of a tiny nucleus containing ____ and ____ . Which is surrounded by a cloud of _____.

Answer 7

Atom
Protons
Neutrons
Electrons

Question 8

What collectively is the subatomic mass

Answer 8

Protons, neutrons and electrons.

Question 9

What has a positive charge?

Answer 9

Protons

Question 10

What has no / neutral charge

Answer 10

Neutrons

Question 11

What has a negative charge

Answer 11

Electron

Question 12

Each element has a fixed number of protons, which is its____ _____

Answer 12

Atomic number

Question 13

What make up the atomic mass?

Answer 13

Total number of protons and neutrons (which determines how heavy it is)

Question 14

Atoms are always neutral in charge so have the same ____ _____

Answer 14

Electrons and protons

Question 15

Atomic mass =

Answer 15

Number of protons and electrons

Question 16

Atomic number =

Answer 16

number of protons

Question 17

Number of protons

Answer 17

= number of electrons

Question 18

What varies with an isotope?

Answer 18

Number of neutrons.

Question 19

Why are isotopes important for biological studies?

Answer 19

Because if an isotope of an element is replaced within the (horse) of the same element not usually found in the body, the alternate isotope can be tracked by its mass or radioactivity.

Question 20

What is a molecule?

Answer 20

Two or more elements of the same combine to form a molecule..

Question 21

Give an a example of a molecule?

Answer 21

Two oxygen elements, ie o2

One oxygen is not a molecule of oxygen, but two are

Question 22

What is a compound?

Answer 22

As opposed to a molecule (two or more of the same element) a compound is two or more different elements, ie water h2o one hydrogen and two oxygen.

Question 23

Everything that exists is made up off _____ and _____

Answer 23

Atoms elements