10SCI Chemistry #3

Elements

100

Which element on the periodic table has the chemical symbol "O"?

Oxygen

200

What is the chemical symbol for the element Neon?

Ne

300

What is the Atomic Number of the element Tin?

50

400

Which element makes up around 78% of Earth's atmosphere?

Nitrogen. About 21% of Earth's atmosphere is Oxygen, and the last 1% is made up of other gases such as Argon and Carbon Dioxide.

500

Which element is bauxite, graphite (pencil leads), and diamond composed of?

Carbon

Atomic Structure

100

Which sub-atomic particle has no electrical charge?

Neutron

200

Draw a diagram of a Helium atom

2, Protons, 2 Neutrons, 2 Electrons

300

Draw a diagram of a Calcium ATOM

20 Protons, 20 Neutrons, 20 Electrons

400

Which sub-atomic particle is responsible for chemical reactions?

Electrons

500

What does the Relative Atomic Mass of an element measure?

The number of Protons, plus the number of Neutrons, in an atom of a particular element.

If an element has isotopes (variants) then this number is averaged across all variants.

Ions

100

What do we call positively charged ions?

Cations

200

What is the charge on an oxygen ion?

O^2-

300

What is the range of possible ionic charges?

3-  -->  3+

400

What is the chemical symbol and ionic charge of a Barium ion?

Ba²⁺

500

What is Ionic Bonding?

When two or more oppositely charged ions bond together, allowing all involved ions to obtain a full valence shell

Balancing

100

How can we tell if an equation is correctly balanced?

Same number of atoms of each element on both sides of the equation.

200

Balance this equation:

Ca(OH)₂ + HF --> CaF₂ + H₂O

Ca(OH)₂ + 2HF --> CaF₂ + 2H₂O

300

Balance the ionic charges:

K⁺ + O^2- --> ?

2K⁺ + O^2- -->K₂O (Potassium Oxide)

400

Balance this equation:

NaOH + NH₃ --> Na₃N + H₂O

3NaOH + NH₃ --> Na₃N + 3H₂O

500

Balance the ionic charges:

Al³⁺ + O^2- --> ?

2Al³⁺ + 3O^2- --> Al₂O₃

Acids/Bases

100

Which colour would a highly concentrated acidic solution become when I added universal indicator?

Red/Orange

200

Does salt water have a higher concentration of Hydrogen or Hydroxide?

Neither, it is neutral, therefore has an even balance of Hydrogen and Hydroxide

300

If I added Phenolphthalein to an acidic solution, what colour would the solution become?

Clear, no change. Phenolphthalein only turns pink/purple in the presence of bases/alkalis.

400

What is the acronym for an Acid-Base reaction?

BASH - Base + Acid --> Salt + H₂O

500

What is dissociation?

When an acid or alkali breaks up into its ionic components in solution. (eg. HCl --> H⁺ + Cl^-)