Question

When elements are joined chemically in a compound, they:-
(a) loose their original properties (b) keep their origi
(c) become a mixture
Which of the following does not describe elements?
(a) all the particles are alike (b) can join together to for
(c) can be broken down into simpler substances
(d) have particular properties
Which substance is a compound?
(a) carbon
(b) chlorine
(c) sodium chloride
(d) sodium
Which process can be used to separate salt from the mixture of salt and
(a) filtration
(b) sublimation
(c) paper chromatography (d) distillation
How can you see the colours of chemicals present in bright-ci
chocolate beans?
(a) by distillation
(b) by sublimation
(c) by paper chromatography (d) by filtration
​

Answer 1

Answers to the following questions are as follows:

• When elements are joined chemically in a compound, they: (a) lose their original properties.
• (c) can be broken down into simpler substances does not describe elements.
• (c) sodium chloride is a compound.
• (a) filtration can be used to separate salt from the mixture of salt and water.
• (c) by paper chromatography can help you see the colors of chemicals present in bright-chocolate beans.

Compounds:

• A compound is a substance created by the chemical fusion of two or more elements.
• Covalent bonds and ionic bonds are two typical forms of bonds that hold components in a compound together.
• Any compound will always include each ingredient in a specific ratio.

Elements:

• An element is a material in chemistry and physics that cannot be divided into smaller parts by any non-nuclear chemical reaction.
• The amount of protons in an element's atomic nuclei makes it identifiable.

Filteration:

• Filtration is the process of removing solid particles from liquid or gaseous fluids by passing the fluid through a filter media while keeping the solid particles behind.
• The desired product could be either the fluid that has been cleared or the fluid that has had its solid particles removed.

Paper chromatography:

• In analytical chemistry, paper chromatography is a technique used to separate dissolved chemical compounds by taking advantage of their differing rates of migration through paper sheets.
• It is a cheap yet effective analytical tool that only needs very little raw material.

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Answer 2

1. (a) lose their original properties.
2. (c) can be broken down into simpler substances does not describe elements.
3. (c) sodium chloride is a compound.
4. (a) filtration can be used to separate salt from the mixture of salt and water.
5. (c) by paper chromatography can help you see the colors of chemicals present in bright-chocolate beans.

Compounds:

• A compound is a substance created through the chemical fusion of  or extra elements.
• Covalent bonds and ionic bonds are  usual sorts of bonds that preserve additives in a compound together.
• Any compound will constantly encompass every component in a selected ratio.

Elements:

• An detail is a fabric in chemistry and physics that can't be divided into smaller components through any non-nuclear chemical reaction.
• The quantity of protons in an detail's atomic nuclei makes it identifiable.

Filtration:

• Filtration is the technique of doing away with stable debris from liquid or gaseous fluids through passing the fluid thru a clear out out media even as retaining the stable debris behind.

• The favored product might be both the fluid that has been cleared or the fluid that has had its stable debris removed.

Paper chromatography:

• In analytical chemistry, paper chromatography is a method used to split dissolved chemicals through taking benefit in their differing quotes of migration thru paper sheets.
• It is a reasonably-priced but powerful analytical device that best wishes little or no uncooked material.

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