What type of change takes place when a can is crushed?
What is a physical change?
100
What is the scale for an acid?
What is 0 to 6
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
What is the scale for a base?
What is 8 to 14
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
How can you make an electromagnet stronger?
What is add more wire?
300
What is one of the clues for a chemical change?
What is color change, gas formation, energy change, solid formation?
300
What is the strongest Acid and Base?
What is 0 for Acid and 14 for base
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
400
What is are the two quantities you must know to calculate the density of a sample matter?
What is mass and volume
400
An unknown substance is dissolved in water. The solution has a higher concentration of OH- ions than H+ ions. What kind of solution does this substance form?
What is a basic solution
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
What tool helps you identify an unknown organism by distinguishing between the characteristics that describe the unknown?
What is a dichotomous key?
500
What type of change causes a new substance to form?
What is a chemical change?
500
You dip blue litmus paper into an unknown solution. The blue litmus paper remains blue. What kind of substance is it?
What is a base
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