Signs of Reactions
Did a physical or chemical reaction occur: two solutions are mixed together and form a precipitate
Chemical reaction
What type of reaction is this: Na + Cl --> NaCl
synthesis
Define an ion
an atom with a charge
What impacts polarity?
electronegativity
atom with different number of neutrons/weight
Did a physical or chemical reaction occur:
paper is shredded
physical
what type of chemical reaction is this:
NaCl --> Na + Cl
Decomposition
Name one unique property of water
adhesion, cohesion, surface tension, solvent, catalyst
Covalent bonds are made up of...?
2 nonmetals
Which has the larger atomic radius and why? O or Ca?
Ca because it has more electron shells.
Did a physical or chemical reaction occur:
water evaporates into a gas
physical
what type of chemical reaction is this:
CH4 + O2 --> H2O + CO2
Combustion
what is one difference between ionic and covalent bonds?
sharing vs transferring e-, nm +nm vs nm + m, neutral vs polar and non polar
Ionic bonds are made up of?
One metal and one nonmetal
define cation
atom that loses electrons and becomes positively charged
Did a physical or chemical reaction occur:
a match stick is lit
chemical
what type of chemical reaction is this:
Al + HCl --> AlCl3 + H2
Single Replacement
explain the bright line emission spectrum
each element has a unique color signature
Ca3P2 is an example of what type of bond?
Ionic because it is a metal + a nonmetal
what is the equation for finding atomic mass?
protons + neutrons =atomic mass
Did a physical or chemical reaction occur:
two substances are room temperature in separate bags. When combined, the bag becomes cold
chemical
H3PO4 + HCl --> PCl5 + H2O
Double Replacement
How is light emitted?
when e- come back. down from excited to ground state, they emit energy in the form of light
why must the same number of atoms exist on either side of a chemical equation?
Law of Conservation of Mass
what is the trend for electronegativity?
Decreases down a group, increases across a period