Science 1

Question 1

What are substances that make electrically conductive aqueous solutions (ions) when dissolved in water?

Answer 1

Electrolytes

Question 2

What is electricity that is supplied in a power supply?

Answer 2

A flow of electrons

Question 3

What are carbon rods called?

Answer 3

Electrodes

Question 4

What is the negative electrode called?

Answer 4

Cathode

Question 5

What is the positive electrode called?

Answer 5

Anode

Question 6

When there is a popping sound from the gas collected in the test tube, what is it?

Answer 6

Hydrogen

Question 7

When the gas smells like bleach or a swimming pool in the test tube, what is it?

Answer 7

Chlorine (poisonous)

Question 8

What is electrolysis?

Answer 8

Splitting of substances by electricity

Question 9

What do we use to perform electrolysis in a more controlled way during an experiment?

Answer 9

Hoffman’s Voltameter

Question 10

Oxidation or Reduction, which one occurs at the anode?

Answer 10

Oxidation

Question 11

Oxidation or Reduction, which one occurs at the cathode?

Answer 11

Reduction

Question 12

Why does pure water not conduct electricity?

Answer 12

De-ionized (free ions removed)

Question 13

What is the ratio of the volumes of hydrogen and oxygen obtained on the electrolysis of water?

Answer 13

2:1 (because of electrons)

Question 14

What is the process of the cathode being coated by the metal in the solution called?

Answer 14

Electroplating

Question 15

If the metal is less reactive than hydrogen, which one would form in the cathode? (both are cations)

Answer 15

Metal

Question 16

If the metal is more reactive than hydrogen, which one would form in the cathode? (both are cations)

Answer 16

Hydrogen

Question 17

If the negative ion from the ionic compound is simple (ex. Cl-or Br-), what would be produced in the anode?

Answer 17

The element

Question 18

If the negative ion from the ionic compound is an ionic compound (ex. NO3-, SO42-, CO32-), what would be produced in the anode?

Answer 18

Oxygen

Question 19

Ions give electrons to the _____ to become atoms. Two of these atoms bond together to become molecules.

Answer 19

Anode

Question 20

Ions receive electrons from the _____ to become atoms. Two of these atoms bond together to become molecules.

Answer 20

Cathode

Question 21

What did Alessandro Volta create that was the invention of the first true battery?

Answer 21

Voltaic pile

Question 22

What was the voltaic pile made of?

Answer 22

Discs of same two metals (copper & zinc) separated by electrolyte of salt water

Question 23

What did Alessandro Volta stack to create the first battery: the voltaic pile?

Answer 23

Voltaic cell

Question 24

In a voltaic cell, is the cathode positive or negatively charged?

Answer 24

Positively charged

Question 25

In a voltaic cell, is the anode positive or negatively charged?

Answer 25

Negatively charged

Question 26

How are electrons sent to? (Anode to Cathode, or Cathode to Anode)

Answer 26

Anode to Cathode

Question 27

What does one voltaic cell provide around how much V of electricity?

Answer 27

1.1V

Question 28

In the salt bridge, where do the cations inside go? (cathode or anode)

Answer 28

Cathode

Question 29

In the salt bridge, where do the anions inside go? (cathode or anode)

Answer 29

Anode

Question 30

Why does sugar not conduct electricity?

Answer 30

Sugar dissolves but don’t form ions

Question 31

In a voltaic cell, what is used to maintain electrical neutrality inside?

Answer 31

salt bridge

Question 32

In the manganese dry cell, what is the central cathode made out of?

Answer 32

carbon

Question 33

In the manganese dry cell, what is the outer anode made out of?

Answer 33

Zinc

Question 34

In the manganese dry cell, what is the most reactive part of the cathode?

Answer 34

Mn02

Question 35

What is the opposite of the movement of electrons?

Answer 35

Current