Random

Question 1

What is an atom?

Answer 1

An atom is the smallest unit of ordinary matter that has properties of a chemical element

Question 2

Ion

Answer 2

A charged particle formed from the loss or gain of one or more electrons

Question 3

Polyatomic ion

Answer 3

An ion that is composed of more than one atom

Question 4

Molecule

Answer 4

A neutral particle composed of two or more atoms joined together by covalent bonds

Question 5

Element

Answer 5

An element is a substance that is made entirely of one type of atom.

Question 6

Diatomic Molecules

Answer 6

Diatomic Molecules are molecules composed of only two atoms, either the same or different chemical elements

Question 7

Ionic bonds

Answer 7

Ionic bonds are charged atoms that are attracted to each other

Question 8

Binary Acid

Answer 8

An acid composed of hydrogen and non-metal

Question 9

Compound

Answer 9

Compound is a molecule made up of atoms from different elements

Question 10

Pure Substance

Answer 10

A material that is composed of only one type of particle

Question 11

Solution

Answer 11

In a chemical, solution is a homogeneous mixture composed of only one phase. In such a mixture a solute is a substance dissolved in another substance known a solvent

Question 12

Heterogeneous Mixture

Answer 12

when two or more objects are seen by the human eye in a mixture

Question 13

Physical Change

Answer 13

Physical changes are changes affecting the form of the chemical substance but not the chemical composition. Physical changes are used to separate mixtures into their component compounds, but usually cannot be separated into chemical elements or simpler compounds

Question 14

Chemical Reaction

Answer 14

A process in which new substances with new properties are formed

Question 15

Covalent Bonds

Answer 15

Covalent bonds involve the sharing of a pair valence electrons by two atoms. Once they share the electrons they become stable.

Question 16

Oxyacid

Answer 16

An acid composed of hydrogen, oxygen and another element

Question 17

Physical Property

Answer 17

A physical property is any property that is measureable whose value describes a state of a physical system

Question 18

Chemical Property

Answer 18

A chemical property is any of a materials properties that become evident during a chemical reaction

Question 19

Catalyst

Answer 19

A substance that increases the rate of reaction and is regenerated at the end of a reaction

Question 20

Concentration

Answer 20

The amount of a particular substance in a specific amount of another substance, also the amount of dissolved substance contained per unit of volume of solvent

Question 21

Rate of Reaction

Answer 21

The rate of reaction for a given chemical reaction is the measure of change in concentration of the reactants or the change if concentration of the product in unit of time

Question 22

Electromagnetic Spectrum

Answer 22

The entire range of electromagnetic waves in order of wavelength and/or frequency

Question 23

Wavelength

Answer 23

The distance from one crest (or trough) of a wave to the next crest (or trough)

Question 24

Frequency

Answer 24

number of crests (or troughs) that pass a given point in one second

Question 25

Incident Ray

Answer 25

A ray of light that travels from a light source toward a surface

Question 26

Reflected Ray

Answer 26

A ray that begins at the point where the incident ray and the normal meet

Question 27

Normal`

Answer 27

A line constructed to be perpendicular to a surface where the ray of light meets the surface

Question 28

Angle of Incidence

Answer 28

The angle between the incident ray and the normal in a ray diagram

Question 29

Angle of Reflection

Answer 29

The angle between the reflected ray and the normal in a ray diagram

Question 30

Reflection

Answer 30

The change in direction of a light ray when it bounces off a surface

Question 31

Critical Angle

Answer 31

The angle of incidence that produces an angle of refraction of 90degrees

Question 32

Refraction

Answer 32

The bending of light as it travels, at an angle, from a material with one refractive index to a material with a different refractive index

Question 33

Virtual Image

Answer 33

An image formed by rays that appear to be coming from a certain position, but are not actually coming from that position; image doesn't form a visible projection on a screen

Question 34

Real Image

Answer 34

An image that is formed when reflected rays meet

Question 35

Lens

Answer 35

A transparent object with at least one curved side that causes light to bend

Question 36

Focal Point

Answer 36

The point on the principal axis through which reflected rays pass when the incident rays are parallel to and near the principal axis

Question 37

Focal Length

Answer 37

The distance between the vertex of a mirror and the point; half the distance from the vertex to the centre of curvature

Question 38

Principal Axis

Answer 38

The line that passes through the centre of curvature, C, of a mirror or lens and is normal to the axis of symmetry

Question 39

Magnification

Answer 39

The change in size of an optically produced image

Question 40

Concave Mirror

Answer 40

A mirror whose reflecting surface curves inward

Question 41

Speed of light

Answer 41

3.0x 10^8

Question 42

Convex Mirror

Answer 42

A mirror whose reflecting surface curves outward

Question 43

Incandescence

Answer 43

Light emitted from a material because of the high temperature of material

Question 44

Bioluminescence

Answer 44

Light that that is produced by a biochemical reaction in a living organism

Question 45

Flourescence

Answer 45

Light that is emitted during exposure of the source to UV light

Question 46

Phosphorescence

Answer 46

Light that is emitted due to the exposure of the source to UV light, and that continues to be emitted for some time in the absence of the UV light

Question 47

Centre of Curvature

Answer 47

The centre of a circle that passes through a curve at a given point and has the same tangent and curvature at that point.

Question 48

Index of refraction

Answer 48

The ratio of the speed of light in a vacuum to the speed of light in a given medium

Question 49

Anaphase

Answer 49

The phase of mitosis in which the centromere splits apart the and the chromatids are pulled to opposite sides of the cell by the spindle fibres

Question 50

Metaphase

Answer 50

The phase of mitosis in which the chromosomes are aligned across the center of the cell

Question 51

Prophase

Answer 51

The phase of mitosis in which sister chromatids condense and the chromosomes become visible

Question 52

Telophase

Answer 52

The phase of mitosis in which two daughter nuclei are formed

Question 53

SALT- S?

Answer 53

Size- same size, larger, smaller

Question 54

SALT- A?

Answer 54

Altitude- Inverted or upright

Question 55

SALT-L?

Answer 55

Loaction- Between C&F, at C, Beyond C, Behind Image

Question 56

SALT-T?

Answer 56

Type- Real or Virtual