4 (a) Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Chemistry - Question 4 - 2013 - Paper 1
Question 4
4 (a) Complete the sentence by putting a cross (X) in the box next to your answer.
An acid reacts with a metal oxide to form
☐ A salt and hydrogen only
☐ B s... show full transcript
Worked Solution & Example Answer:4 (a) Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Chemistry - Question 4 - 2013 - Paper 1
Step 1
Complete the sentence by putting a cross (X) in the box next to your answer.
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
In this reaction, an acid reacts with a metal oxide to form:
D a salt and water only.
This is because the general reaction of an acid with a metal oxide produces a salt and water.
Step 2
State two things you would see when solid copper carbonate reacts with dilute nitric acid.
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
When solid copper carbonate reacts with dilute nitric acid, you would observe the following:
The copper carbonate (green solid) disappears as it reacts.
Effervescence or bubbling occurs, indicating the release of carbon dioxide gas.
Step 3
Write the balanced equation for the reaction of copper carbonate with dilute nitric acid.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Sign up now to view full answer, or log in if you already have an account!
Answer
Electrolysis is the process of using electrical energy to drive a non-spontaneous chemical reaction. It involves the decomposition of a compound into its constituent elements or simpler compounds through the application of a direct electric current. This process occurs in an electrolyte solution where ions migrate to the electrodes.
Step 5
Describe a test to show the 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
To test for oxygen gas, you can use a glowing splint. Here’s how:
Insert a glowing splint into the test tube containing the gas.
If oxygen is present, the glowing splint will reignite or relight brightly, confirming the presence of oxygen.
