Quantitative chemistry

If a gas escapes during a reaction, the mass will look like it has ______

Decreased

If a gas is gained during a reaction, the total mass will look as though it has _____

Increased

If a thermometer has a mark every 1.0 degrees, what is it’s resolution?

1.0 degrees

Which has a higher resolution, a thermometer with a mark at every 1.0 degrees or one with a mark every 2.0 degrees?

1.0 degrees

The ____ of a measuring instrument is defined as the smallest change in quantity that gives a visible change in the reading

Resolution

The ______ of a measuring instrument is estimated as plus or minus half the smallest scale division

Uncertainty

What is the uncertainty of a thermometer with a mark every 1.0 degrees?

+ or - 0.5 degrees

What is represented by the vertical lines that join points on the graph?

The uncertainty

What name is given to the number 6.02 × 10 to the power of 23 ?

Avogado’s constant

What is 6.02 × 10 to the power of 23 equal to?

1 mole

What is the mass number?

23

What is the atomic number?

11

What does Mr stand for?

Relative formula mass

What does Ar stand for?

Relative atomic mass

Which law states that no atoms are lost or made in a chemical reaction?

The law of conservation of mass

Which law states that the total mass of products = the total mass of reactants?

The law of conservation of mass

One mole of a substance contains ___ ___ number of particles as one mole of any other substance

The same

Avogadro’s constant x the amount of substance in mol = ….

The number of particles

What is defined as ‘the maximum possible mass of a product that can be made in a chemical reaction’?

The theoretical yield

One reason for not obtaining the calculated amount of a product during a reaction, is that the reaction is reversible and therefore may not go to _____

Completion

One reason for not obtaining the calculated amount of a given product during a reaction is that some product may be lost when it’s ______ from the reaction mixture

Separated

What is the equation for percentage yield?

Mass of product actually made/ maximum theoretical mass of product x 100

Work out the answer

75 percent

Strong acids _____ dissociate into ions in a solution

Completely

Weak or strong? Nitric acid, sulfuric acid and hydrochloric acid

Strong

Weak acids _____ dissociate in solutions

Partially

The higher the concentration of H+ ions in an acidic solution, the ____ the pH

Lower

The lower the concentration of H+ ions in an acidic solution, the ____ the pH

Higher

The higher the concentration of OH- ions in an alkaline solution, the _____ the pH

Higher