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What are compounds?
What are chemical changes?
How can you spot a chemical change?
How can you use chemical changes?
Miscellaneous
100
A combination of two or more elements
What is a compound?
100
Changing one substance into another is a ______________.
What is chemical change?
100
A color change on metal that is caused by a chemical change
What is tarnish?
100
Plants use a chemical reaction called ________ to produce sugars from sunlight, water, and carbon dioxide.
What is photosynthesis?
100
An example of a physical change in matter is ____________.
What is ice cube melting, cup of water freezing, ice cream cone melting, newspaper torn into pieces...
200
A compound has different properties than the ___________ that form it.
What is the elements?
200
When atoms break their old links and form new links with other atoms, a ________________ has occurred.
What is a chemical reaction?
200
When baking soda and vinegar are mixed, you can tell a chemical reaction occurred because of what?
What are bubbles?
200
Plants and animals use a chemical reaction called ____ to burn sugars for energy.
What is respiration?
200
An example of a chemical change in matter is ___________.
What is log burning, flashlight turning on, firecracker exploding, car rusting...
300
Rust is a combination of iron and __________.
What is oxygen?
300
Chemists keep track of which substances are used and created in a chemical reaction by writing ___________________.
What are chemical equations?
300
A solid that forms when two solutions are mixed
What is a precipitate?
300
Chemical reactions are used to create a variety of products, such as ______________.
What are plastics?
300
One sign that a chemical reaction is occurring is _____________.
What is heat, light, bubbles, forming a precipitate, tarnish...
400
The chemical name for rust is __________.
What is iron oxide?
400
Chemicals on the LEFT side of a chemical equation are called _______, and chemicals on the RIGHT side of an equation are called ________.
What are REACTANTS and PRODUCTS?
400
In a chemical change, the substance _____________.
What is changes or becomes chemically different?
400
Chemical changes can occur over _________ periods of time.
What is different?
400
The chemical formula for baking soda is NaHCO3. How many sodium atoms (Na) are there in one molecule of baking soda?
What is one?
500
The chemical formula for rust is _________.
What is Fe2O3?
500
In every chemical reaction, the total mass of the reactants always equals the total mass of the products. This fact is known as the ____________.
What is the law of conservation of matter?
500
If a chemical reaction produces heat and light, then reversing the reaction should ____________.
What is absorb energy?
500
When a tree falls in the woods and begins to ____________, this is an example of a chemical change.
What is decompose?
500
How is a compound different from a mixture?
What is it cannot be separated by a physical change?