balancing chemical equations
____Hg + _____O2 -> _______HgO
2Hg + O2 -> 2HgO
synthesis
What are the three parts of an atom
protons, electrons, and neutrons
Did a reaction occur when water is placed into a freezer and become ice? if yes, what was the sign of a chemical reactions?
No
What state of matter is the oxygen (O2)
CH4(g) + O2(g) -> H2O(l) + CO2(g)
gas
Why do we balance chemical reactions?
Conservation of mass. New atoms cannot be added or destroyed
Ag + Ni(NO3) -> Ni + Ag(NO3)
single displacement
what is the densely positive core of an atom called?
nucleus
Did a reaction occur when mixed together two colorless solutions produced fizz and bubbles? if yes, what was the sign of a chemical reactions?
yes - formation of a gas
What is the fundamental building block of matter called?
the atom
_____ Na2(SO4) + _____ BaCl2 -> _____ Ba(SO4) + _____NaCl
Na2(SO4) + BaCl2 -> Ba(SO4) + 2NaCl
CH4 + O2 -> H2O + CO2
combustion
Argon has an atomic number of 18. How many protons does it have?
18
What is a chemical reaction?
When the old bonds from the reactants break and form new bonds to create the products
How many different types of atoms are there? (How many elements are there - Think Periodic Table of Elements)
118
____CaSO4 + ___AlBr3 -> ___CaBr2 + ____Al2(SO4)3
3CaSO4 + 2AlBr3 -> 3CaBr2 + Al2(SO4)3
Na2(SO4) + BaCl2 -> Ba(SO4) + NaCl
double displacement
What is a bond?
A sharing of electrons between two atoms
Did a reaction occur when mixed together two colorless solutions produced a bright yellow solid? if yes, what was the sign of a chemical reactions?
Yes, precipitate
Who was the scientist who is discovered/wrote the basic atomic theory?
Dalton
______CH4 + ______O2 -> ______H2O + ______CO2
CH4 + 2O2 -> 2H2O + CO2
ZnCO3 -> Zn + CO2 + O2
decomposition
Carbon's atomic number is 6. Its mass number is 13. How many neutrons are in this atom of carbon
7
What are the 5 signs of a chemical reaction?
What makes each element different from other elements?
The atomic number or the number of protons