Chemical Bonding Quiz

Chemical Bonding Quiz

Chemistry   12:23

The table below shows the number of protons in elements P and Q.

Element	Number of protons
P	3
Q	11

The reactivity of the reaction between element Q and chlorine is higher than the reactivity of the reaction between element P and chlorine.

1. State the group that elements P and Q belong to in the Periodic Table.

2. State the period that element Q belongs to in the periodic table.

3. Element P reacts with chlorine to form a compound.

1. What type of compound is formed?

2. Write the formula of the compound that is formed.

3. Draw the electron arrangement of the compound that is formed.

4. Element Q reacts more vigorously than element P.  Explain this occurrence in terms of the electron arrangement.

5. Element R has a proton number of 2 and a nucleon number of 4. Explain why element R does not react with element Q.

Stoichiometry of Solutions Presentation (ppt)

Stoichiometry of Solutions Presentation (ppt)

Stoichiometry   23:47

Solution and Suspension PPT part2

Solution and Suspension PPT part2

Solutions and Suspensions   23:42

Slides presentation part-2
Click here to download

Solution and Suspension PPT - part1

Solution and Suspension PPT - part1

Solutions and Suspensions   23:39

Solutions and Suspensions
part 1 – Matter, Solutions

Kalam Kudus Christian School

Chemistry Checkpoint 2

Mr. Markus

                          

Pure Substance

• A type of matter in which all particles are of the same chemical composition (element, compound)

• Au (pure gold)

• H2O

• NaCl

• Sugar (C6H12O6)

• Ar

• Which of the previous examples is a compound?  an element?

• Why is salt water not a pure substance?

Mixtures

• Two or more pure substances physically mixed together.

• Cannot be represented by a chemical formula.

• Salt water

• Sand and rocks

• Air

Heterogeneous Mixture

• A mixture where substances are not evenly distributed (non uniform)

• oil and vinegar salad dressing

• vegetable soup

• sand and sugar

• soil

• granite

Homogeneous Mixture (Solution)

• A mixture where all components are evenly distributed (uniform).

• “same throughout”

• salt water

• gasoline

• syrup

• air

Practice

• Identify each of the following as:

• pure substance/mixture

• element/compound

Definition of Solutions

• A solution is a homogeneous mixture in which one substance is dissolved in another substance

• The solute is(are) the substance(s) present in the lesser amount(s), dissolved by the solvent

• The solvent is the substance present in the larger amount, does the dissolving/dissolves the solute

Solution

• Formed when one substance is dissolved by another.

• In order to be dissolved, a substance must be soluble.

• A homogeneous mixture.

• Particles are evenly distributed.

• Parts cannot be separated by filtering.

• Solvent—does the dissolving

• Solute—dissolved by the solvent

Solution Practice

• Identify the solute and solvent in each of the following:

• Salt water

• Iced tea

• Coca-cola coke

• Paint/paint thinner

• Nail polish/acetone

• Ethanol

Types of Solutions

• Solid dissolved in a liquid.

• Salt water

• Gas dissolved in a liquid

• Coca-cola

• Two solids

• Metal alloys: brass = copper + zinc

• Two gases

• Air: nitrogen (78% vol), oxygen (21% vol), argon (1% vol), carbon dioxide (0.03% vol).

• In solutions of 2 solids or 2 gases, the solvent is the component present in largest quantity. 

IONIC COMPOUNDS
Compounds in Aqueous Solution

Many reactions involve ionic compounds, especially reactions in water — aqueous solutions.

K+(aq)  +  MnO4-(aq)

KMnO4 in water

Aqueous Solutions

How do we know ions are present in aqueous solutions?

They are called ELECTROLYTES

HCl, MgCl2, and NaCl are strong electrolytes. They dissociate completely (or nearly so) into ions.

Aqueous Solutions

Some compounds dissolve in water but do not conduct electricity.  They are called nonelectrolytes.

Examples include:

sugar

ethanol

ethylene glycol

nonelectrolyte

weak electrolyte

strong electrolyte

Electrolytes in the Body

 

Make your own

50-70 g sugar One liter of warm water Pinch of salt 200ml of sugar free fruit squash Mix, cool and drink

• Carry messages to and from the brain as electrical signals

• Maintain cellular function with the correct concentrations electrolytes

Electrolysis Revision Questions

Electrolysis Revision Questions

IGCSE Chemistry   07:56

Redox Worksheet

Redox Worksheet

redox   16:10

IGCSE Chemistry-Rate of reaction worksheet

IGCSE Chemistry-Rate of reaction worksheet

Speed of Reaction   14:24

Nuclear Atom Quiz

Nuclear Atom Quiz

PHYSICS   13:46

The Nuclear Atom

1. The diagram represents an atom.

            a. What name is given to the central part of the atom?

            b. What particles make up this central part?

            c. What particles orbit around the central part?

            d. Which part of the atom has most of its mass?

            e. Atoms are small. Roughly how many, placed in a line, would occupy one millimetre – a

                thousand, a million, a billion or a trillion?

        2. The nucleus of an atom of nitrogen is represented by the symbol:

            a. How many nucleons are there in this nucleus?

            b. What is the proton number of this nucleus and what is its neutron number?

            c. How many electrons are there in a neutral atom of this second isotope?

        3. The diagram shows what happens when alpha particles pass close to the nucleus of a gold atom.

            a. Explain why the path of an alpha particle may bend as it passes close to a gold nucleus.

            b. Explain why one of the alpha particles is undeflected.

            c. One alpha particle has been ‘back-scattered’. Explain why this has happened.