A physical change is a change is a substance that does not change what the substance is. In contrast, in chemical change a new substance is formed. 

Let's look at our options:

When wood is burned, the wood turns into ash. We can't get the piece of wood back once it's been burned; thus, wood burning is a chemical change. 

When a cake is baked, the ingredients combine and turn into a cake once it's baked. Once we have a cake, we can't get the ingredients back; thus, baking a cake is a chemical change. 

When a nail rusts, pieces of the metal nail have turned into rust. We can't get the original nail back; thus, a nail rusting is a chemical change. 

Ice is made up of water, and when the ice melts we are left with a puddle of water. If we freeze the water, it will turn back into ice; thus, melting ice is a physical change. 

A physical change is a change is a substance that does not change what the substance is. In contrast, in chemical change a new substance is formed. 

Let's look at our options:

When wood is burned, the wood turns into ash. We can't get the piece of wood back once it's been burned; thus, wood burning is a chemical change. 

When a cake is baked, the ingredients combine and turn into a cake once it's baked. Once we have a cake, we can't get the ingredients back; thus, baking a cake is a chemical change. 

When a nail rusts, pieces of the metal nail have turned into rust. We can't get the original nail back; thus, a nail rusting is a chemical change. 

Cutting a piece of wood does not change the wood, it's still a piece of wood, just smaller; thus, cutting a piece of wood is a physical change. 

A physical change is a change is a substance that does not change what the substance is. In contrast, in chemical change a new substance is formed. 

Let's look at our options:

Ice is made up of water, and when the ice melts we are left with a puddle of water. If we freeze the water, it will turn back into ice; thus, melting ice is a physical change. 

Cutting a piece of wood does not change the wood, it's still a piece of wood, just smaller; thus, cutting a piece of wood is a physical change. 

Butter melting is similar to ice melting. When butter melts, it can be frozen back to butter; thus, butter melting is a physical change. 

When wood is burned, the wood turns into ash. We can't get the piece of wood back once it's been burned; thus, wood burning is a chemical change. 

The answer is "all of these."

A substance is anything that takes up space and has mass. Substances can exist in solid, liquid, and gas form. When you mix two substances and you might or might not create something new, and it all depends on what two substances you are mixing. Ripping, tearing, smashing, stirring, squishing, and changing the shape of a substance by mixing it with another is called a physical change. Chemical changes occur when a new, third substance is created by combining two substances. Signs of a chemical change include, release of heat, bubbles, a color change, and smells!

A substance is anything that takes up space and has mass. Substances can exist in solid, liquid, and gas form. When you mix two substances and you might or might not create something new, and it all depends on what two substances you are mixing. Ripping, tearing, smashing, stirring, squishing, and changing the shape of a substance by mixing it with another is called a physical change. Chemical changes occur when a new, third substance is created by combining two substances. Signs of a chemical change include, release of heat, bubbles, a color change, and smells!

The answer is "When Sarah puts all her toys in the box, it makes a new substance."

A substance is anything that takes up space and has mass. Substances can exist in solid, liquid, and gas form. When you mix two substances and you might or might not create something new, and it all depends on what two substances you are mixing. Ripping, tearing, smashing, stirring, squishing, and changing the shape of a substance by mixing it with another is called a physical change. Chemical changes occur when a new, third substance is created by combining two substances. Signs of a chemical change include, release of heat, bubbles, a color change, and smells!

A substance is anything that takes up space and has mass. Substances can exist in solid, liquid, and gas form. When you mix two substances and you might or might not create something new, and it all depends on what two substances you are mixing. Ripping, tearing, smashing, stirring, squishing, and changing the shape of a substance by mixing it with another is called a physical change. Chemical changes occur when a new, third substance is created by combining two substances. Signs of a chemical change include, release of heat, bubbles, a color change, and smells!

The answer is "No, Sydnie is not making a new substance because only the shape of the sand and water changes."

A substance is anything that takes up space and has mass. Substances can exist in solid, liquid, and gas form. When you mix two substances and you might or might not create something new, and it all depends on what two substances you are mixing. Ripping, tearing, smashing, stirring, squishing, and changing the shape of a substance by mixing it with another is called a physical change. Chemical changes occur when a new, third substance is created by combining two substances. Signs of a chemical change include, release of heat, bubbles, a color change, and smells!

A mixture is when two or more substances are combined to create something new. The substances can remain separate like a salad or trail mix, but still, something new is formed. Another type of mixture is a solution when one substance dissolves into another like salt being stirred into water.

Many people have the misconception that once a substance has been mixed into a liquid that it cannot be separated. When something like salt is stirred into water, it seems to disappear, so the thought of separating it can be hard to imagine. There is no way to sift the salt out or remove the salt pieces with forceps. If the water is set in the sunlight, it will begin to evaporate and leave behind the salt that was mixed in.