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100
Anything that has mass and takes up space
What is matter
100
The simplest substance, it cannot be broken down by any physical or chemical means
What is an element
100
A compound is represented by
What is a chemical formula
100
A substance that undergoes this change is still the same substance
What is physical change
100
The number in front of a molecule is called the
What is coefficient
200
Every form of matter has these two types of properties
What are physical and chemical properties
200
The basic particle of all elements.
What is an atom
200
Water is an example of a ______________ because
What is a compound and its makeup is always 2 hydrogen atoms and 1 oxygen atom no matter where we find it
200
Which one of these does not belong? Why Building a sand castle Broken glass Folding laundry Leaves changing color in fall
What is leaves changing color in fall. The others are physical changes while this is a chemical change
200
Thermal energy always flows from
What is a warmer to colder matter
300
When a liquid freezes it changes its state of matter. This shows the _______________ property of matter
What is physical
300
Atoms combine chemically and held together by these forces to form molecules
What is chemical bond
300
Salt- NaCl is _________________ because
What is -compound, the elements sodium and chlorine are chemically combined in a set ratio
300
The process where a solid directly changes to a gas without melting and this is an example of a ______________ change
What is sublimation and physical change
300
Melting of ice is an _______________ reaction while burning wood is an ________________ reaction.
What is endothermic and exothermic
400
The characteristic of a pure substance that can be observed without changing it into another substance.
What is physical property
400
The center of an atom has these two particles in it
What are protons and neutrons
400
You can see condensation on a cold soda can when you leave the can on a table. Why?
What is the water vapor (gas) in the atmosphere cools down and condenses (turns into a liquid)when it touches the cold can
400
When water is broken down into H and O by the process of electrolysis it has undergone a ______________ change
What is chemical
400
The coefficient tells you
What is the number of molecules of that compound/ element
500
Gold does not react easily with oxygen or sulfur is a ______________ property
What is chemical property
500
Elements chemically combine and form these that have properties different than those of the combined elements
What is a compound
500
Distilling a liquid solution (distillation ) is a _______________ property
What is physical
500
This produces new substances with properties different from those of the original substances
What is chemical change
500
If the products have the elements C, H, O, Na then the reactants should have these elements
What is C, H, O, Na