I Biological and non-biological substances both need oxygen for their existence. II The human body
consists only of biological substances. - I is correct and II is incorrect
Characteristics of life include: - growth and metabolism
Examples of synthetic substances are: - plastics and silicones
E...
I Biological and non-biological substances both need oxygen for their existence. II The human body
consists only of biological substances. - ✔✔I is correct and II is incorrect
Characteristics of life include: - ✔✔growth and metabolism
Examples of synthetic substances are: - ✔✔plastics and silicones
Examples of organic biological substances are: - ✔✔carbohydrates and fats
Examples of mineral substances are: - ✔✔paraffins and petroleum
Matter is everything that: - ✔✔occupies space and has weight
The three forms of matter are solids, liquids and: - ✔✔gases
What property does all matter have? - ✔✔All matter has weight
Condensation is the change of matter from: - ✔✔a gas to a liquid
Vapourisation is the change of matter from: - ✔✔liquid to a gas
Melting is the change of matter from: - ✔✔a solid to a liquid
Sublimation is the change of matter from: - ✔✔a solid to a gas
,Condensation is: - ✔✔the change of a vapour to a liquid
The alteration of the properties of matter without the formation of any new substance is called a/an: -
✔✔physical change
The immediate change of a solid into a vapour is called: - ✔✔sublimation
An example of a single-celled cellular organism is: - ✔✔a bacterium
I. A micro-organism is the smallest part of the human body. II All micro-organisms need nutrients for
their existence. - ✔✔I is incorrect and II is correct
Examples of bacteria are: - ✔✔bacilli and cocci
I. Every living organism needs some non-biological substances for it's existence. II. All non-biological
substances are found as minerals in the earth. - ✔✔I is correct and II is incorrect
Science deals mainly with: - ✔✔physics and chemistry
The study of the structure of the body is called: - ✔✔anatomy
The study of the functions of living organisms is: - ✔✔physiology
I Anatomy is a very important science in the field of biology. II Anatomy is the science which deals with
the functions of the human body. - ✔✔I is correct and II is incorrect
I Physiology is a very important science in the field of biology. II Physiology is the science which deals
with the functions of the body. - ✔✔I and II are both correct
,Which one of the following belongs to the science of chemistry? - ✔✔The alteration of the structure of
molecules
I Chemical reactions only take place outside and not inside a living organism. II The structure of
molecules change during chemical reactions. - ✔✔I is incorrect and II is correct
The field of physics includes: - ✔✔heat and electricity
Which one of the following belongs to the field of physics? - ✔✔Sound, electricity and heat
The field of physics includes: - ✔✔the science of electricity
An anion is: - ✔✔A negatively charged atom
An anion is: - ✔✔a negatively charged chloride atom (CI-)
A cation is: - ✔✔A positively charged sodium atom (Na+)
An electrolyte is: - ✔✔A substance which, dissolved in water, splits into ions
Examples of electrolytes are: - ✔✔acids and salts
An example of an electrolyte is: - ✔✔salt-solution
An acid is an electrolyte because: - ✔✔it can conduct an electric current
An example of an inorganic acid is: - ✔✔sulphuric acid
An alkali must contain: - ✔✔metal atoms and hydroxyl group(s) (OH)
, An example of an alkaline substance is: - ✔✔soap
If a metal-oxide is dissolved in water it forms: - ✔✔an alkali
The pH scale is used to measure the degree of acidity or: - ✔✔alkalinity
pH can be decreased by: - ✔✔increasing hydrogen-ions
The letter p in pH means: - ✔✔potential
pH is: - ✔✔the number of free H-ions in solution
If the pH of a solution is between 5 and 7, the solution is a: - ✔✔weak acid
If the pH of a solution is between 1 and 3 the solution is a: - ✔✔strong acid
If the pH of a solution is between 7 and 9 the solution is a: - ✔✔weak alkali
If the pH of a solution is between 12 and 14 the solution is: - ✔✔strong alkali
The pH of distilled water is: - ✔✔7
Lemon juice, with a pH reading of about 2, is considered to be: - ✔✔acid
Pure water, with a pH of 7, is considered to be: - ✔✔neutral
Substances having a pH value above 9.5 are considered to be: - ✔✔alkaline
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