Introduction to the cell, Matter and its classification, Elements and their symbols

Question 1

What are the six levels of structural organisation?

Answer 1

Chemical level
* Cellular level
* Tissue level
* Organ level
* System level
* Organismal level

Question 2

What is the structure of a cell?

Answer 2

basic structural and functional unit of an
organism that are composed of chemicals.
-Single cellular organisms
-Multicellular organisms

Question 3

What is the classification of a cell?

Answer 3

• Prokaryotes (Bacteria)
• Eukaryotes (Fungi, cells in Human body, Plant cells)

Question 4

What are examples of different cell forms

Answer 4

A: Cells involved in
reproduction
* B: Cells involved in
movement
* C: Cells that are involved in
transport
* D: cells that line cavities and
provide protection

Question 5

What is an atom?

Answer 5

smallest units of matter that participate in chemical reactions. Smallest particle of an element that can exist and still have the properties of the element

Question 6

What atoms are essentials for maintaining life?

Answer 6

carbon (C), Hydrogen (H), Oxygen (O), Nitrogen (N)

Question 7

WHat are molecules?

Answer 7

two or more atoms joined together. Group of two or more atoms that functions as a unit because the
atoms are tightly bound together

Question 8

What is chemistry?

Answer 8

Field of study concerned with the
characteristics, composition, and transformations of
matter

Question 9

WHat is matter

Answer 9

Anything that has mass and occupies space

Question 10

What is a physical reaction?

Answer 10

Change in physical state but chemical composition stays the same. e.g., melting, boiling, freezing. ice to water and water to steam.

Question 11

What is chemical reaction

Answer 11

Where the composition does change. Changes in which one or more substances are formed. e.g., iron corrosion/ rusting, the statue or liberty

Question 12

What are the physical states of matter?

Answer 12

Solid: A solid has a definite shape and a definite volume.
Liquid: has an indefinite shape - its takes the shape of the container it’s in- and a definite volume
Gas: A gas has an indefinite shape and an indefinite volume it assumes the shape and volume of the container it’s in.

Question 13

What are the classes of matters

Answer 13

Pure substances and mixtures.

Question 14

What are pure substances and examples

Answer 14

Elements: Cannot be broken down into simpler substances by chemical or physical means. e.g., carbon, oxygen (on the periodic table)
Compounds: Can be broken down into constituent by element and chemicals but not physical means. Chemical combinations of two or more elements. e.g., water (H2O), table salt.

Question 15

What are mixtures and examples?

Answer 15

Homogeneous: One visible phase and same properties throughout. e.g., sugar in water, salt if water, milk in tea
Heterogeneous: Two or more visible phases. different properties and different phases. e.g., oil in water, water and a coin.

Question 16

What is the structure of an atom?

Answer 16

Subatomic particles = building block for atoms
Electron: Possesses a negative electrical charge - Found outside the nucleus
Proton: Carries a positive charge equal to the electron’s negative charge
Neutron: Has no charge

Question 17

What is a nucleus of an atom?

Answer 17

• Small, dense, positively charged center of an atom
• Contains all protons and neutrons
• Electrons are found outside the nucleus

Question 17

What is the electrical charge of an atom

Answer 17

Atom as a whole is electrically neutral
No net electrical charge

Question 18

What are the components of an atom?

Answer 18

. protons, neutrons, and electrons

Question 18

How many protons are there?

Answer 18

Number of protons = Number of electrons

Question 20

How many known kinds of atoms?

Answer 20

118, one for every element.

Question 21

What are the isotopes?`

Answer 21

The atoms of various isotopes of an element contain the same number of protons but differ but differ in the number of neutrons in the nucleus. isotopes have the same atomic numbers and different mass numbers.

Question 22

What is atomic mass?

Answer 22

The average mass of all isotopes of an element weighted according to natural abundance is the atomic mass.