Laden....
|
Druk & Houd Vast om te Verslepen |
|||
|
Klik hier om te sluiten |
|||
Vraag 1 Verslag
The green colour solution of an Fe2 salt changes to a brown solution of an Fe3+ salt by
Antwoorddetails
Vraag 2 Verslag
Which of the following is TRUE of a catalyst? I. it alters the activation energy of a reaction
II. it is effective in a reaction but cannot initiate a reaction
III, it affects the equilibrium of a reversible reaction
IV. it affects the overall reaction
Vraag 3 Verslag
Which compound is a product of the hydrolysis of the of CH3COOC3H7 with aqueous sodium hydroxide?
Antwoorddetails
Vraag 4 Verslag
Ethanol is a product of fermentation of simple sugars. Which method is used to separate ethanol from the other products?
Vraag 5 Verslag
if an element X with atomic number 13 combines with an element Y whose atomic number is 8 the most likely formula of the compound formed between X and Y is?
Antwoorddetails
Vraag 6 Verslag
What is the ratio of the rate of diffusion of carbon(IV) oxide to that of propane, under the same conditions? [H = 1; C= 12; 0= 161
Antwoorddetails
Vraag 7 Verslag
An experiment to test the conductance of 0,1 M solutions of the substances listed below was perform.
I ammonia
II ammonium chloride
III ethanoic acid
IV sodium ethanoate
Which pair of substances show the least conductance?
Antwoorddetails
Vraag 11 Verslag
A measure of the degree of disorderliness in a chemical system is known as the
Antwoorddetails
Vraag 14 Verslag
A gas X diffuse through porous partition at the rate of 3 cm3 per second. Under the same condition hydrogen diffused at the rate of 15 cm3 per second.
What is the 42. relative molecular mass of X.
Antwoorddetails
Vraag 16 Verslag
How much sodium hydroxide is required to nka 250 cm3 ofa0.1 molar solution? Na=23; 0=16; H=1]
Antwoorddetails
Vraag 20 Verslag
Faraday s first law of electrolysis can be expressed mathematically as
Antwoorddetails
Vraag 23 Verslag
On exposure to hydrogen sulphide, moist lead (II) ethanoate paper turns
Antwoorddetails
Vraag 25 Verslag
When an electric current is passed through a solution containing dilute tetraoxosulphate (Vi) acid, 190 cm3 of hydrogen gas is evolved. if the measurements were made at 26°C and 736 mmHg, what is the volume of hydrogen at s.t.p.?
Antwoorddetails
Vraag 27 Verslag
The Atomic theory model which explains that electrons in an atom revolve round quantized energy levels is attributed to
Antwoorddetails
Vraag 28 Verslag
in any chemical reaction, the total mass of products is always equal to that of the reactants.
This Is statement of the law of:
Antwoorddetails
Vraag 31 Verslag
To test for the presence of chloride ions in ion, correct sequence of reagents to use is
Antwoorddetails
Vraag 32 Verslag
20 cm3 of 0.09 mol dm3 solution of tetraoxosuiphate (Vi) acid requires 30cm3 of sodium hydroxide solution for complete neutralization. The molar concentration of sodium hydroxide is [H = 1; S = 32; 0 = 16; Na = 23]
Antwoorddetails
Vraag 33 Verslag
The atomic number of iron is 56. The number of unpaired electrons in the Fe3+ ion is
Antwoorddetails
Vraag 34 Verslag
what dose the following equation illustrate? \( ^{238}U_{92} → ^{234}Th_{90} + ^4 He_2 \)
Antwoorddetails
Vraag 35 Verslag
The maximum number of electrons that can occupy the shell having a principal quantum number of 3 is
Antwoorddetails
Vraag 36 Verslag
The molar mass of a compound X is 56. its empirical formula is CH2. X is
Antwoorddetails
Vraag 38 Verslag
NaCl(s) does NOT conduct electricity, but N(aq) does. This is because
Antwoorddetails
Vraag 39 Verslag
The high boiling point of hydrogen fluoride can be explained in terms of
Antwoorddetails
Wilt u doorgaan met deze actie?