GCSE CHEMISTRY A PAPER 1 PERIODIC TABLE
ELEMENTS AND PHYSICAL CHEMISTRY
COMPREHENSIVE REVISION AND WORKED
ANSWERS 2026
◉ A hypothesis which appears to be verified by multiple
experiments and/or researchers may become a . Answer: theory
◉ An excellent tool to gauge the reliability of any theory is its
capacity to generate accurate. Answer: predictions
◉ A theory that repeatedly fails to confirm the expected predictions:
needs to be modified
is probably correct
requires more research time
should be maintained indefinitely. Answer: 1
◉ What are the foundations of beliefs from which a person begins to
reason called?
theory
,hypothesis
presupposition
none of the above. Answer: 3
◉ A scientific law: (Select all that apply.)
is generally accepted as true
has never been found to be in error
has no known contradictions
must be reverified occasionally. Answer: 1
2
3
◉ Select all that apply.
A direct relationship occurs when:
two variables increase at the same time
two variables decrease at the same time
one variable increases as another variable decreases
xy=k. Answer: 1
2
,◉ Select all that apply.
Which of the following measurements have 3 significant figures?
0.0882 m
0.8820 m
8,820 m
882.0 m. Answer: 1
3
◉ Which of the following measurements has 4 significant figures?
832,000 g
8000 g
800. g
800.0 g. Answer: 4
◉ Which of the following measurements has 2 significant figures?
0.001 cm
11.0 cm
, 100 cm
100 cm. Answer: 4
◉ Round 23.455 to 4 significant digits:. Answer: 23.46
◉ Round 6.362 to 2 significant digits:. Answer: 6.4
◉ Express in scientific notation.
0.000543 = _____
5.43 x 10-2
5.43 x 10-3
5.43 x 10-4
5.43 x 10-5. Answer: 3
◉ Express as an ordinary number.
8.97 x 10-3 = _____
0.0897
0.00897
0.000897
0.0000897. Answer: 2
ELEMENTS AND PHYSICAL CHEMISTRY
COMPREHENSIVE REVISION AND WORKED
ANSWERS 2026
◉ A hypothesis which appears to be verified by multiple
experiments and/or researchers may become a . Answer: theory
◉ An excellent tool to gauge the reliability of any theory is its
capacity to generate accurate. Answer: predictions
◉ A theory that repeatedly fails to confirm the expected predictions:
needs to be modified
is probably correct
requires more research time
should be maintained indefinitely. Answer: 1
◉ What are the foundations of beliefs from which a person begins to
reason called?
theory
,hypothesis
presupposition
none of the above. Answer: 3
◉ A scientific law: (Select all that apply.)
is generally accepted as true
has never been found to be in error
has no known contradictions
must be reverified occasionally. Answer: 1
2
3
◉ Select all that apply.
A direct relationship occurs when:
two variables increase at the same time
two variables decrease at the same time
one variable increases as another variable decreases
xy=k. Answer: 1
2
,◉ Select all that apply.
Which of the following measurements have 3 significant figures?
0.0882 m
0.8820 m
8,820 m
882.0 m. Answer: 1
3
◉ Which of the following measurements has 4 significant figures?
832,000 g
8000 g
800. g
800.0 g. Answer: 4
◉ Which of the following measurements has 2 significant figures?
0.001 cm
11.0 cm
, 100 cm
100 cm. Answer: 4
◉ Round 23.455 to 4 significant digits:. Answer: 23.46
◉ Round 6.362 to 2 significant digits:. Answer: 6.4
◉ Express in scientific notation.
0.000543 = _____
5.43 x 10-2
5.43 x 10-3
5.43 x 10-4
5.43 x 10-5. Answer: 3
◉ Express as an ordinary number.
8.97 x 10-3 = _____
0.0897
0.00897
0.000897
0.0000897. Answer: 2
