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Set2
Set3
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Set5
100
Electrons orbit around this part of an atom...
the nucleous. (protons/Neutrons)
100
A mixture is when...
2 or more substances are MIXED together.
100
The molecules/chemicals that go into a chemical reaction are called...
reactants (because they react)
100
The molecules/chemicals that are produced from a chemical reaction are called...
Products
100
A simple example of a mixture is...
Trail mix (or any other acceptable answer.)
200
What makes one atom different from another is the...
number of protons!
200
A solution is a...
Mixture in which a substance is dissolved in a liquid.
200
When balancing the reactants and products of a chemical equation, you need to balance BOTH the...
Number and kinds of elements.
200
The most important thing to know about balancing chemical equations is that the number of atoms in the reactants...
Always equals the number of atoms in the products.
200
What is an important fact to know about the element Oxygen, especially when balancing equations?
Oxygen is always found bonded with another atom of Oxygen. For example, it is always found as either O2 or O3.
300
The 3 parts of an atom and their charges are...
• Proton- Positive charge • Nuetron- NO charge • Electron- Negative charge
300
A solid that forms from a solution...
Precipitate.
300
Balance this equation... 2NaCl + F2 > NaF + Cl2
2NaCl + F2 > 2 NaF + Cl2
300
Balance this equation... N2 + 3H2 > NH3
N2 + 3H2 > 2NH3
300
The atomic number of an element is always equal to the number of...
Protons an element has.
400
When 2 elements bond together they create a...
Molecule.
400
The difference between a mixture/solution and a chemical reaction is that...
In a mixture/solution the molecules stay what they are. In a reaction something new is created.
400
Balance this equation... CH4 + O2 > CO2 + H2O
CH4 +2O2 > CO2 + 2H2O
400
Balance this equation... Reactants: 2KClO3 > KCl + O2
2KClO3 > 2KCl + 3O2
400
Balance this equation... H + O > H2O
4H + O2 > 2H2O
500
What is the atomic symbol for Gold
Au
500
An example of evidence that a chemical reaction has occurred could be...
(At least one of these...) • fizzing/bubbling • a precipitate • a temperature change • gas forming • a new smell
500
Balance this equation... HCl + CaCO3 > CaCl2 + H2O + CO2
2HCl + CaCO3 > CaCl2 + H2O + CO2
500
The field of science that deals with balancing chemical equations is called...
Stoichiometry.
500
What is the last naturally occurring element and what is it's atomic #?
Uranium- 92
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