Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

SC15H part 2 SC16H

Pearson GCSE Combined and Separate Chemistry Higher

QuestionAnswer
What is a by-product of an industrial process? A substance produced in a chemical reaction in addition to the desired product.
What is a system called if no substances can enter or leave it? A closed system.
What do chemists call a series of reactions used to make a particular product? A reaction pathway
If the temperature of an endothermic reversible reaction is increased what happens to the position of the equilibrium, and the time taken to reach equilibrium? The position of the equilibrium moves in the direction of the endothermic reaction, The time taken to reach equilibrium decreases.@
If the concentration of a reacting substance is increased what happens to the position of the equilibrium, and the time taken to reach equilibrium? The position of the equilibrium moves away from the reactants, The time taken to reach equilibrium decreases.
If a catalyst is added to a system in dynamic equilibrium what happens to the position of the equilibrium, and the time taken to reach equilibrium? Position of equilibrium unchanged, Time taken to reach equilibrium decreases.
If the pressure is decreased in a reversible reaction involving gases what happens to the position of the equilibrium, and the time taken to reach equilibrium? Position of equilibrium moves to side with more molecules, Time taken to reach equilibrium increases.
What do scientists call a device that produces a voltage due to reactions between reactants stored inside it, until one of the reactants is used up? A Chemical Cell
What is a fuel cell? A device that produces a voltage due to reactions involving a fuel and oxygen, for as long as these reactants are supplied.
What is the only waste product from a hydrogen oxygen fuel cell? Water.
What is a chemical cell? A unit which contains chemicals which produce electricity through a reaction
What are the main components of a chemical cell? An anode, a cathode and an electrolyte
What is an electrolyte? A solution containing ions which allows current to flow.
What does the potential difference of a cell depend on? The type of electrode and the electrolyte.
What is a battery? Two or more cells connected in series
What happens to the electrodes in a chemical cell? The more reactive metal depletes and the less reactive one increases in size.
In non-rechargeable cells, why do the chemical reactions stop over time? One of the reactants becomes used up.
How can certain cells be recharged? Applying an external electric current
How does the reactivity of the metal electrodes affect the size of the potential difference? The greater the difference in reactivity, the greater the potential difference.
What is a fuel cell? A cell which uses a fuel and oxygen (or air) to generate electricity.
What are the products in a hydrogen fuel cell? Water
State three advantages of hydrogen fuel cells Do not need to be recharged, no pollutants are produced, can be different sizes for different uses
State three disadvantages of hydrogen fuel cells Hydrogen is highly flammable, hydrogen is sometimes produced through non-renewable means, hydrogen is difficult to store
Complete the equation which occurs at the negative electrode of a hydrogen fuel cell 2H₂+4OH⁻→ 4H₂O + 4e⁻
Complete the equation which occurs at the positive electrode of a hydrogen fuel cell O₂+2H₂O→ 4OH⁻
What is the overall reaction occuring in a hydrogen fuel cell? O₂ + 2H₂ → 2H₂O
Does a hydrogen fuel cell produce greenhouse gases? yes water is a greenhouse gas
Does a hydrogen fuel cell produce any carbon emissions? no, only product Is water, but sometimes CO2 is produced making the hydrogen fuel.
Why is hydrogen difficult to store? It is a highly flammable gas so needs pressurised tanks
What other fuels can fuel cells run on? methanol
Popular Chemistry sets

 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards