These are things that are made up of several substances. They contain two or more chemical substance placed together.
joseph rimiru answered the question on December 1, 2017 at 20:23
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What is a pure substance?
Date posted: December 1, 2017. Answers (1)
- Describe the nature of gases.(Solved)
Describe the nature of gases.
Date posted: December 1, 2017. Answers (1)
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Describe the nature of liquids
Date posted: December 1, 2017. Answers (1)
- Describe the nature of solids(Solved)
Describe the nature of solids.
Date posted: December 1, 2017. Answers (1)
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State the three states of matter and what they depend on?
Date posted: December 1, 2017. Answers (1)
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What is matter?
Date posted: December 1, 2017. Answers (1)
- In terms of structure and bonding, explain why ethanol has a high melting point than dimethyl ethyl(Solved)
In terms of structure and bonding, explain why ethanol has a high melting point than dimethyl ethyl
Date posted: December 1, 2017. Answers (1)
- Account for the high melting point of metals.(Solved)
Account for the high melting point of metals.
Date posted: November 29, 2017. Answers (1)
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Which allotrope of carbon conducts electricity?
Date posted: November 29, 2017. Answers (1)
- Use the diagram below to answer the questions that follow.(Solved)
Use the diagram below to answer the questions that follow.
In which set-up will iron -nail rust?Explain
Date posted: November 28, 2017. Answers (1)
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Name the physical process used to obtain salt crystals from a salt solution.
Date posted: November 28, 2017. Answers (1)
- A piece of burning sulphur was lowered into a gas jar filled with oxygen and containing aqueous litmus solution as shown.(Solved)
A piece of burning sulphur was lowered into a gas jar filled with oxygen and containing aqueous litmus solution as shown.
(a)State two observations made during the experiment.
(b)Write an equation for the burning xof sulphur in air.
Date posted: November 28, 2017. Answers (1)
- Use the diagram below to answer the questions that follow(Solved)
Use the diagram below to answer the questions that follow
(a)After the experiment has been running for some time,record two major observations made in the tube.
(b)Write an equation for the reaction that takes place in the dish containing lead (ii)oxide
Date posted: November 28, 2017. Answers (1)
- In the equation below identify the reagent that acts as an acid and give a reason(Solved)
In the equation below identify the reagent that acts as an acid and give a reason
Date posted: November 28, 2017. Answers (1)
- The diagrams below were used to investigate the effects of sulphur (iv) oxide.(Solved)
The diagrams below were used to investigate the effects of sulphur (iv) oxide.
State and explain the observations made in diagrams (I) and (II)
Date posted: November 28, 2017. Answers (1)
- The diagram below shows some apparatus used in the laboratory(Solved)
The diagram below shows some apparatus used in the laboratory
Name the apparatus and state their uses.
Date posted: November 28, 2017. Answers (1)
- The set up below shows the apparatus used for the preparation of nitrogen (i) oxide
(Solved)
The set up below shows the apparatus used for the preparation of nitrogen (i) oxide
(a)(i)Name solid X
(ii)What precautions is taken when heating solid X
(b)Nitrogen (i) oxide does not burn but a magnesium ribbon continues burning in the gas.Explain
Date posted: November 27, 2017. Answers (1)
- Study the set up of apparatus below and answer the questions that follow. (Solved)
Study the set up of apparatus below and answer the questions that follow.
(a)Write the equations for the reaction that occurs in tube V
(b)State one industrial use of gas W
(c)Name another metal that can be used in tube instead of magnessium
Date posted: November 27, 2017. Answers (1)
- The grid below is part of the periodic table.Study it and use it to answer the questions that follow.The letters are not the actual symbols...(Solved)
The grid below is part of the periodic table.Study it and use it to answer the questions that follow.The letters are not the actual symbols of the elements
(i)Which is the most reactive metallic element shown in the table above.Explain
(ii)Write the formula of the compound formed when element E reacts with element G
(iii)What is name given to the group of elements where A,B and C belongs?
Date posted: November 27, 2017. Answers (1)
- Study the table below and answer the questions that follow(Solved)
Study the table below and answer the questions that follow
(i)Select a substance with a giant metallic structure.Explain
(ii)Substance A and C conduct electricity in molten state at room temperature.What is the difference in
their conductivity?
(iii)Select a substance which is in gaseous state.Explain
Date posted: November 27, 2017. Answers (1)