True or false: boiling water to evaporate it is a chemical change
False, state changes are physical
True or false: we will run out of renewable resources.
False, they are renewable and will never run out
Why is it important to save energy and not waste electricity?
1. Good for the environment, 2. Save money & energy, etc.
I try to mix sand and water together. No matter how hard I try, it won't dissolve. This means sand is ____________ in water.
insoluble
My circuit has a 10 volt battery, one bulb, and a switch. The bulb isn't bright. Why?
The switch may not be turned on...
Boiling water is a physical and ________ change.
Reversible
What type of change is melting chocolate?
Physical
__________: when something can be dissolved, especially in water
Soluble
When solid butter turns into liquid butter it is a chemical change. True or false?
False, this is a temporary physical change. It's a change in the state of matter
My milkshake has ice cream, milk, sprinkles, and chocolate chips. When I mixed the milkshake, it made a solution. True or false?
False, the sprinkles and chocolate chips are insoluble and will not dissolve. This means you made a mixture, not a solution.
A rock melting into lava is a physical and _______ change.
Reversible
What is the best source of energy?
Renewable resources, we won't run out and they are good for the environment
Natural gas is a renewable resource because it is natural and comes from the earth. True or false?
False, natural gas is nonrenewable because it will run out one day.
How can we separate a mixture?
Use a filter
To make a solution, I add water (solvent) to a cup with salt (solute). I stir it well and the salt dissolves. How can I separate the solvent and the solute?
You can separate them by boiling or evaporating the water
True or false: this shows a irreversible change.
False
My milkshake has milk, ice cream, syrup, and honey. I stir it very well and the toppings dissolved. What type of mixture did I make?
Homogeneous mixture (aka solution)
Nuclear energy is a renewable resource. True or false?
False, while nuclear energy can be good for the environment, the fuel it uses, uranium, is found in the ground and might run out one day.
True or false: melting ice is a physical change
True
I turned off my TV. It's still plugged into the wall. Is this saving energy?
No, the TV is turned off but it is still plugged in, which means it is drawing vampire electricity.
I want to save electricity by turning off the lights. I'm worried my room will be dark. What can I do?
Open the blinds/curtains and use natural sunlight
What is the function of a battery in a circuit?
The battery provides electricity (energy) to power the components in the circuit
How can we safely use electricity?
...
How can I make a metal turn into a magnet?
Add electricity (it makes an electromagnet!)
True or false: this shows a irreversible change.
True
True or false: this shows a reversible change.
False
__________: when something can't be dissolved, even after stirring or agitating
Insoluble
What type of change is burning wood?
Chemical
I try to mix sugar into my tea. When I agitate the mixture by stirring, the sugar dissolves. This means sugar is __________ in tea.
soluble
True or false: this shows a reversible change.
True
What is vampire electricity?
The power that electronic devices use when they are plugged in but not in use, or when they are in standby mode.
What is dissolving?
When a solid is mixed into a liquid, which creates a solution.
True or false: this shows a reversible change.
True
In a chemical change, there is always energy generated. Give an example of this?
Heat, light, or sound can be generated
What is an electromagnet?
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.
What is the most important thing to remember when making a strong electromagnet?
The more coils an electromagnet has the stronger the magnetic force will be.
True or false: it's okay to touch a plug with wet hands
False
Baking a cake is a chemical and ________ change.
Irreversible
What type of change is melting wax?
Physical
Frying bacon is a chemical and ________ change.
Irreversible
How can we separate a solution?
Boiling or evaporation
How can we save energy at home and at school?
Use natural lights, use less AC, look for vampire electricity, etc.
Why do we cover wires with plastic?
To keep us safe and prevent electrocution (wire is a insulator)