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Physical and Chemical changes
Exothermic and Endothermic Reactions
chemical reactions
Mixtures & Compounds
Random Science
Trivia
100
What type of change takes place when a can is crushed?
What is a physical change?
100

Endothermic and Exothermic Reactions are measured by evaluating the ___________ of a sample.

Temperature

100
What is the left side of a chemical equation called?
What is a reactant?
100
Soil is made up of pieces of rocks, wood, decayed plants, and many other materials. What is soil?
What is a mixture
100
What is the most abundant gas in Earth's present Atmosphere?
What is Nitrogen
200
What type of change occurs when iron rusts?
What is a chemical change?
200

If I needed an effective cold pack to treat an ankle sprain, I would want to create an ___________  reaction which causes a __________ in temperature.

Endothermic

Decrease

200
What is the right side of a chemical equation called?
What is a product?
200
What is a EVEN combination of two or more substance that are not chemically combined
What is an homogenous mixture
200

The deepest part of the ocean.

What is Challenger Deep in the Mariana Trench?

300
What is one of the clues for a chemical change?
What is color change, gas formation, energy change, solid formation?
300

At the beginning of a chemical reaction, the initial temperature of the sample was 35 degrees Celsius.  After the reaction was complete, the final temperature of the sample was 90 degrees Celsius.  

This is an example of a ________ _________.

Exothermic Reaction

300
What is the name of the small number in a chemical equation?
What is a subscript?
300
What is a pure substance that can be separated into two or more simpler substance by chemical means?
What is a compound
300

What is the product of photosynthesis?

What is Oxygen & Glucose

400
What is are the two quantities you must know to calculate the density of a sample matter?
What is mass and volume
400

In a chemical reaction, when there is a HIGH amount of energy released when new bonds are made the chemical reaction will be _____________.  

Exothermic

400
What law states that in a chemical equation, matter is neither created nor destroyed?
What is the law of conservation of mass?
400
What is an uneven mixture?
What is heterogeneous mixture
400
The organization of living things. 

What is an atom, a molecule, an organelle, a cell, a tissue, an organ, an organ system, an organism?

500
What type of change causes a new substance to form?
What is a chemical change?
500

In an exothermic reaction, the amount of energy required to start the reaction is [less / more] than the amount of energy [absorbed / released].

Less/ Released

500
What coefficient is needed to balance the following equation: 2H2 + O2 ---> ____H2O
What is 2?
500
What is a chemical formula and an example?
What is uses chemical symbols and subscripts to identify the number and toes of atoms that make up a molecule of a compound.
500
What is the difference between rotation and revolution
What is rotation is 24hrs while revolution is 365 days