C5 How much?

?
In a titration, an acid and alkali _____.
Neutralise. acid+acid->salt+water.
1 of 40
When an alkali is placed in an indicator, what colour does it go? In a a) Litmus, b) Phenolphthalein, c) Screened Methyl Orange?
a) Blue, b) Pink, c) Green
2 of 40
When an acid is placed in an indicator, what colour does it go? In a a) Litmus, b) Phenolphthalein, c) Screened Methyl Orange?
a) Red, b) Colourless, c) Pink
3 of 40
Sodium ions are essential in our diets for water balance and nerve responses, but too much can cause _____________ and _______.
High blood pressure and heart disease.
4 of 40
As a concentration increases the ______ particles become more crowded.
Solute.
5 of 40
What are titrations used to find?
The concentrations of an alkali from a known concentration of acid or vice versa.
6 of 40
Concentration x volume = ?
Amount in moles
7 of 40
What is 'empirical formula'?
It is the simplest whole number ratio of each type of atom of a compound.
8 of 40
What s the molecular and empirical formula of Glucose?
M: C6H12O6 and E: CH2O
9 of 40
How does metal carbonate get to metal oxide plus carbon dioxide?
By thermally decomposing.
10 of 40
What are three ways to measure gas volume?
Using a burette, measuring cylinder and a gas syringe.
11 of 40
At room temperature and pressure, how much room does 1 mole of gas take up?
24dm3
12 of 40
When magnesium ribbon reacts with acid, the amount of hydrogen given off varies with the amount of the _________________.
Limiting factor.
13 of 40
When the limiting factor is all used up there are no more particles of that substance to collide with the other reactant, so the amount of product formed is __________ to the amount of the limiting factor.
Directly proportional.
14 of 40
When is equilibrium reached?
When the reactants and the products balance/ forward reaction equals backwards reaction.
15 of 40
Equilibrium only works if it is in a _____ system.
Closed.
16 of 40
450 degrees c, atmospheric pressure and V2O5 catalyst are used in the contact process. Why are they used to create the most economic yield?
The forward reaction is exothermic, there are three gas molecules on the left of the equation and two on the right and a catalyst.
17 of 40
What can alter the equilibrium?
Changing the temperature, pressure and concentration.
18 of 40
As the temperature increase, ___ product is made as the equilibrium is moving to the left.
Less.
19 of 40
What are the four stages of preparing a clean and dry sample of insoluble salt?
Mix (the two solutions); Filter (the precipitate); Wash (with distilled water); Dry (leaving the precipitate in a warm place for the water to evaporate).
20 of 40
What is a spectator ion?
An ion which does not directly take part in a reaction.
21 of 40
Ina precipitation reaction involving mixing two different ionic solutions, there is an extremely high _______ between the ions of the two solutions, so the reaction is extremely ____.
Collision frequency; Fast.
22 of 40
Ionic substances form ______ _____.
Ionic Lattices.
23 of 40
Strong acids ________ when in water.
Ionise completely. HCl -> H+ + Cl-
24 of 40
How is a reversible reaction set up?
weak acid <=> hydrogen ions + other ions.
25 of 40
The concentration of an acid tells us....
How many mole there are in 1 dm3 of solution.
26 of 40
The strength of an acid tells us....
How much an acid ionises and the degree of ionisation.
27 of 40
A concentrated solution of a weak acid still has a low concentration of ____ ions.
H+
28 of 40
Explain how reversible reactions reach equilibrium?
The reaction must be a closed system so the chemicals can't escape; the forward rate with begin to decrease; the backward reaction will begin to increase as more products are available; eventually backward is as fast as forward
29 of 40
What are the three conditions used in the contact process?
450 degrees c, atmospheric pressure and a V2O5 catalyst.
30 of 40
Why is litmus used in preference over universal indicator for a titration?
Litmus gives a sharp colour change at the end point of a titration; so it it easy to spot; UI gives a gradual change so change is not seen clearly.
31 of 40
What is the relative atomic mass of an element?
Is the average mass of an atom compared to the mass of 1/12th of an atom of carbon-12.
32 of 40
Indicators are used in titrations. What does a single indicator, like litmus, do that differs from universal indicator when used in a titration?
Litmus gives a sudden change in colour; universal indicator gives a continuous colour change.
33 of 40
Ethanoic acid has a lower electrical conductivity than hydrochloric acid. Explain why?
There is a lower concentration of hydrogen ions to carry charge in ethanoic acid.
34 of 40
What is titration?
An accurate method for neutralisation.
35 of 40
What is a precipitation reaction?
A chemical test in which a solid precipitate is formed - tests for metal ions.
36 of 40
What is neutralisation?
A reaction between H+ ions and OH- ions (acid and base react to make a salt and water)
37 of 40
What is a molecule?
Two or more atoms which have been chemically combined.
38 of 40
What is a ionic lattice?
A regular arrangement of charged ions held together by ionic bonds.
39 of 40
To convert cm3 into dm3, divide by _____.
1000, and vice vera.
40 of 40

Other cards in this set

Card 2

Front

When an alkali is placed in an indicator, what colour does it go? In a a) Litmus, b) Phenolphthalein, c) Screened Methyl Orange?

Back

a) Blue, b) Pink, c) Green

Card 3

Front

When an acid is placed in an indicator, what colour does it go? In a a) Litmus, b) Phenolphthalein, c) Screened Methyl Orange?

Back

Preview of the front of card 3

Card 4

Front

Sodium ions are essential in our diets for water balance and nerve responses, but too much can cause _____________ and _______.

Back

Preview of the front of card 4

Card 5

Front

As a concentration increases the ______ particles become more crowded.

Back

Preview of the front of card 5
View more cards

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