7th Grade Science Final Exam Review (Unit 8 & 9) | Baamboozle - Baamboozle

What are used on power lines to stop current flowing into metal pylons?

Insulators

In printed circuit boards, what material is used to carry current?

Copper tracks

Why are electrical wires coated in plastic?

To prevent electric shocks

What happens when opposite charges meet?

They attract

What happens when like charges meet?

They repel

Name three good electrical insulators.

Plastic, wood, air

What are materials that do not allow electric current to flow called?

Insulators

What materials are used for longer-distance transmission of electricity?

Aluminum or steel

What material is commonly used for electrical wiring in homes?

Copper

Why are metals good conductors of electricity?

Electrons are free to move

What materials allow electricity to flow through them?

Conductors

How must an ammeter be connected in a circuit?

In series

What color is the terminal on an ammeter that must connect to the positive terminal of the power supply?

Red

What unit is used to measure electrical current?

Amps

What component measures the electric current?

Ammeter

What symbol is used for a cell in a circuit diagram?

A long line and a short line parallel to each other

What is easier to interpret and uses standard symbols?

Circuit diagram

What must a circuit be for electrons to flow?

Complete

In which direction do electrons flow in a circuit?

From negative to positive terminal

What charge do electrons have?

Negative

What type of particles flow through wires in an electrical circuit?

Electrons

What symbol is used for the positive terminal on a cell?

+

What are the two connections on a cell called?

Terminals

What do we call two or more cells joined together?

A battery

What stores chemical energy that can be changed to electrical energy in a circuit?

A cell

What is produced when black copper oxide is heated with sulfuric acid?

Blue copper sulfate solution

What clue indicates a chemical reaction when zinc is added to hydrochloric acid?

The test tube feels hot

What gas will relight a glowing splint?

Oxygen

What is formed when silver nitrate and calcium chloride solutions are mixed?

Silver chloride

What do we call a solid that forms when solutions are mixed in a chemical reaction?

Precipitate

What happens to limewater when carbon dioxide is bubbled through it?

It turns cloudy

What produces acid in your mouth that can damage teeth?

Bacteria

What causes acid rain?

Harmful chemicals in the air

What do farmers spread on acidic soil to neutralize it?

Lime

What do we call medicines that help with indigestion by neutralizing stomach acid?

Antacids

What products are formed when hydrochloric acid reacts with sodium hydroxide?

Sodium chloride and water

What piece of equipment is used to neutralize an alkali very accurately?

Burette

What color is universal indicator when a solution is neutral?

Green

What happens when acids and alkalis are mixed together?

Neutralization

How do you test for hydrogen gas?

Light a splint and listen for a pop

What gas is produced when magnesium reacts with hydrochloric acid?

Hydrogen

Which state of matter is magnesium oxide at room temperature?

Solid

What gas is formed when carbon burns in air?

Carbon dioxide

What new substance is formed when magnesium burns in air?

Magnesium oxide

What happens when a substance burns in air?

It reacts with oxygen

When iron and sulfur react to form iron sulfide, what are the reactants?

Iron and sulfur

In what type of change are no new substances formed?

Physical change

What is the pH of hydrochloric acid?

2

What do we call features like acidity or reactivity with water?

Chemical properties

What features such as color, state, or melting point are examples of?

Physical properties