year 10 chem

sigh

The first requirement for a successful collision

Reactant particles must collide with each other

The second requirement for a successful collision

Collide with sufficient energy to break bonds with reactants

Third requirement for a successful collision

Collide with the corret orientation

What is activation energy?

Minimum energy required to break the bonds of reactants.

What is activation energy dependent on?

The strength of the bonds and the number of bonds to be broken.

What is rate of reaction?

How quickly or slowly a chemical reaction occurs

Factors that affect rates of reaction

Surface area, concentration of reactants, gas pressure, temperature, catalysts

What is the charge of a cation?

Positive

What is the charge of an anion?

Negative

Atomic number

Number of protons in an atom

How to find atomic mass

No. of protons + no. of neutrons

What is core charge?

The nucleus’ pull on its valence electrons

How to find core charge

No. of protons minus no. of electrons in full inner shells

Down a group, the core charge…

remains the same

Down a group, the number of shells…

Increases

Across a period, the core charge…

Remains the same

Across a period, the number of shells…

remains the same

Can you change subscript numbers in a chemical equation to balance it?

No

Can you change coefficient numbers in a chemical equation to balance it?

Yes