Bonding and Structure
Metallic bonds are very strong and give metals their properties. Which of the following definitions is correct for a metallic bond?
a. A metallic bond is formed by the electrostatic attraction that occurs due to electron transfer between metal atoms.
b. A metallic bond is formed by the electrostatic attraction between the positive ions and the delocalised electrons.
c. A metallic bond is formed by the electrostatic attraction that occurs due to the uneven sharing of electrons between metal atoms.
b. A metallic bond is formed by the electrostatic attraction between the positive ions and the delocalised electrons.
These affect the rate of reaction. (at least 3 answers)
What is surface area, concentration, temperature, use of catalyst, pressure in gases?
a. Aq. NaOH
b. Aq BaCl2
c. Cu
d. CuCO3
b. Aq BaCl2
Which reaction takes place in the presence of light and gives a monosubstituted haloalkane?
a. Combustion
b. Polymerisation
c. Substitution
d. Thermal decomposition
c. Substitution
True or false: ionic compounds usually can not conduct electricity when solid
false
The CONDITIONS for the Haber process
iron/450/200ATM
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When an aqueous salt is crystallised, some water can be retained within the structure of the salt. What is the name given to the type of salt formed?
a. Anhydrous salt
b. dehydrated salt
c. hydrated salt
d. soluble salt
c. hydrated salt
Butene and octene belong to the same homologous series. What would be the same for both compounds?
a. Boiling point
b. Number of hydrogen atoms per molecule
c. Relative molecular mass.
d. Functional Group
d. Functional Group
Which statement correctly describes the arrangement of atoms in silicon dioxide?
a. Each silicon atom is bonded to two oxygen atoms and each oxygen atom is bonded to one silicon atom.
b. Each silicon atom is bonded to four oxygen atoms and each oxygen atom is bonded to two silicon atoms.
c. Each silicon atom is bonded to four oxygen atoms and each oxygen atom is bonded to four silicon atoms.
d. Each silicon atom is bonded to two oxygen atoms and each oxygen atom is bonded to four silicon atoms.
b. Each silicon atom is bonded to four oxygen atoms and each oxygen atom is bonded to two silicon atoms.
What is reduction?
This process involves gain of electrons
A student is provided with solutions of dil HCl, dil H2SO4, solid MgO, ZnCo3 and Cu. How many different salts could the student make?
a. 2
b. 3
c. 4
d. 6
c. 4
Which statement about polymers is correct?
a. Addition polymers are all biodegradable.
b. Condensation polymers can all be hydrolysed to give amino acids.
c. Condensation polymers only exist in nature.
d. Forming addition polymers produces only one product.
d. Forming addition polymers produces only one product.
A covalent molecule M contains a total of 4 shared electrons. What is M?
a. CO2
b. O2
c. N2
d. CH4
b. O2
The physical test and chemical used to find pure water. (2 answers)
What is boiling point at 100ºC/melting point at 0ºC
Anhydrous copper sulphate/cobalt chloride?
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Copper sulphate can be prepared by reacting copper carbonate and sulfuric acid. Which reactant is added in excess and why?
a. sulphuric acid so that all the copper carbonate reacts.
b. copper carbonate so that all the acid is dissolved
c. copper carbonate so that all the acid reacts.
d. sulphuric acid so that all the copper carbonate is dissolved.
c. copper carbonate so that all the acid reacts.
Butane undergoes process P to give ethene, which undergoes process Q gives ethanol, and that undergoes process R to give CO2 and H20. What is P, Q, R (in the same order)?
a. Distillation, fermentation, respiration
b. Distillation, Hydration, Combustion
c. Cracking, fermentation, respiration
d. Cracking, hydration, combustion
d. Cracking, hydration, combustion
What is the electrostatic force of attraction?
What is the electrostatic force of attraction?In ionic bonding, it is the force between the two oppositely charged ions.
The products of photosynthesis
write the chemical and word equation
glucose and oxygen
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Ethene undergoes hydration to form compound A. When Compound A reacts with propanoic acid, compound B is formed. Identify compound A and B.
Compound A - Ethanol
Compound B - Ethyl propanoate