1 (a) Plants release oxygen into the atmosphere - Edexcel - GCSE Chemistry - Question 1 - 2019 - Paper 1
Question 1
1 (a) Plants release oxygen into the atmosphere.
What is the name of the process that releases oxygen into the atmosphere?
A combustion
B oxidation
C photos... show full transcript
Worked Solution & Example Answer:1 (a) Plants release oxygen into the atmosphere - Edexcel - GCSE Chemistry - Question 1 - 2019 - Paper 1
Step 1
What is the name of the process that releases oxygen into the atmosphere?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The process that releases oxygen into the atmosphere is called photosynthesis. During photosynthesis, plants convert carbon dioxide and water into glucose and oxygen using sunlight.
Step 2
Complete the bar chart by showing the percentage of oxygen in the atmosphere.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Since the atmosphere contains 21% oxygen, the bar chart should reflect that the oxygen bar reaches the 21% mark.
Step 3
Calculate the volume of oxygen present in 300 cm³ of air.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To calculate the volume of oxygen in 300 cm³ of air, use the percentage of oxygen in the atmosphere (21%):
Volume of oxygen = 0.21 × 300 cm³ = 63 cm³.
Step 4
number of subatomic particles in an atom
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The atomic number indicates the number of protons, and the mass number is the sum of protons and neutrons.
Atomic number ⟶ number of protons
Mass number ⟶ total number of protons and neutrons
Total number of protons and electrons ⟶ relies on atomic number as the number of electrons equals the number of protons in a neutral atom.
Step 5
Which test shows a gas is oxygen?
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The test that shows a gas is oxygen is B: a glowing splint will relight when placed in the gas. This is a characteristic test for the presence of oxygen.
