who discovered nucleus?
1Ernest Rutherford
2Niels Bohr
3Kameron
Ernest Rutherford
100
What is balance chemical equation?
A balanced equation has equal numbers of each type of atom on each side of the equation.
100
balance the equation
2P+ 3Cl(2)→ PCl(3)
2P+ 3Cl2→ 2PCl(3)
100
(h2) is compound or element
compound
200
Where are the electrons in an atom located?
Atomic orbitals
200
All atoms of zinc have # protons?
30 protons
200
What is the Law of Conservation of Mass?
The Law of Conservation of Mass is a relation stating that in a chemical reaction, the mass of the products equals the mass of the reactants.
200
The rate of a reaction depends upon:
1.the concentration of the reactants..
2the temperature of the reaction.
3whether or not a catalyst is used.
4the nature of the reactants.
all of them
200
(CO2) is a element or compound?
element
300
Which subatomic particle has the smallest mass?
1proton
2neutron
3electron
electrons
300
The atomic number tells the?
number of protons in atom
300
All chemical reactions happen at the same speed.
True or false
False
300
Reaction rates can be changed.
True or false
True
300
What is different from a compound and element?
Element has one type of atom and compound has two or more atoms.
400
What is atomic number of carbon ?
6
400
What is isotopes?
One of two or more atoms that have the same atomic number but a different number of neutrons.
400
Reaction rates can be defined as
1.Changes in reactant or product concentration over time.
2.Changes in equilibrium constant over time.
Changes in reactant or product concentration over time.
400
Reaction rates can change over time as the reaction proceeds.
True or False
True
400
What is Ionic bond?
bond in which one or more electrons from one atom are removed and attached to another atom.
500
A beryllium atom has 4 protons, 5 neutrons, and 4 electrons. What is the mass number of this atom?
9
500
What is ion?
Ion is an atom or molecule in which the total number of electrons is not equal to the total number of protons, giving the atom or molecule a net positive or negative electrical charge.
500
All elements can bond with all other elements.
True or false
False
500
Which of these is a type of reaction?
1Combustion
2Substitution
3Combination
All 4 of the Above
All of the Above
500
bond in which one or more pairs of electrons are shared by two atoms.