Reaction Graph
Radioactive Decay
pH Table
Statistics
Knowledge
100

Identify the number of A molecules that are left after 30 seconds.

5

100

Identify how much uranium-238 remains after 9000 million years.

26%

100

What colour will Congo Red indicator turn when placed into a substance with a pH 1?

Blue/purple
100

Which two groups had the most similar Yield Loads?

Groups 1 and 2

100

A positively charged subatomic particle.

Proton

200


Identify when the amount of A was the same as the amount of B.

9

200

What is the half-life of uranium-238?

4500 million years

200


What is the possible pH range when Bromophenol Blue is blue and Phenol red is yellow?

5-6

200

Which matrix had the most variation in Ca+ sensitivity?

Uric acid - largest error bar

200

What pH range do alkalines/bases have?

8-14

300

How many seconds did it takes for A to reach 5 molecules?

30 seconds

300

How long does it take uranium-238 to reach 2 half-lives?

9000 million years

300

When Thymolphthalein turns blue, is it in an acid or a base?

Base

300

What do error bars tell us?

Error bars represent the variability of data and indicate the uncertainty or how precise the reported measurement is.

300

What is an ion?

An atom or molecule with a positive or negative electric charge due to the loss or gain of electrons.

400

Which line represents the reactants and which represents the products?

A = amount of reactants

B = amount of products

400

What is the half-life of radon according to this geiger counter reading graph?

~50 minutes

400


Which indicator would most accurately identify a solution as an acid or a base?

Bromthymol Blue - Yellow is acid only, blue is base only and green signifies a neutral solution.

400

Are any of the components (phosphate, oxalate and uric acid) statistically different from one another when judging by their error bars?

No, all the error bars overlap each other.

400

What is an isotope?

Forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.

500

Identify the relationship between A and B. Justify your response by referring to data points in the graph.

As B increases in number of molecules over time, A decreases. 

At 0 seconds there is 50 molecules of B but 0 molecules of A. At 9 seconds there are 25 molecules of both A and B. By 60 seconds there are no more B molecules left and 50 A molecules.

500

What is alpha decay?

A type of radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and thereby transforms or 'decays' into a different atomic nucleus, with a mass number that is reduced by four and an atomic number that is reduced by two.

500

What is a neutralisation reaction?

Acid (H) + Base (OH) -> Salt + Water (H2O)

The acid and base neutralise each other to produce a neutral solution.

500

Which two groups are the most statistically different from each other?

2 and 4 - biggest gap between error bars

500

What causes radioactivity?

When an atom is unstable due to an excess of either neutrons or protons. A radioactive atom will attempt to reach stability by ejecting protons or neutrons, as well as other particles, or by releasing energy in other forms.