General Chemistry stuff

Which covalent network can conduct electricity?

Graphite

How do you write charge?

1- or 1+

Put the charge AFTER the number

How do you find percentage mass in a compound?

% mass = (Total A_r of the element ÷ M_r of the compound) × 100

What is the percentage of magnesium in magnesium nitrate?

16.5%

Which of the following is NOT the name of a compound?

Sodium fluorine

What is the GFM of potassium nitrate?

101

First find potassium nitrate formula

K and NO₃

_{1 1}

KNO₃

Then find GFM

39+14+(16×3)

=101

Which group on the periodic table is made up of reactive metals?

Group 1

Describe how elements are arranged in a periodic table

(Achieve) Elements in the Periodic Table are arranged by increasing atomic number

(My answers) increasing reactivity from right to left

Increasing reactivity from top to bottom

4. (continued)

(c) Alcohols can react with acidified potassium dichromate to form carboxylic acids.

(i) Circle the correct words to complete the sentence.

When alcohols react with acidified potassium dichromate the functional

group changes from

hydroxyl

carboxyl

to

carboxyl

hydroxyl

(choose the correct words to fill the blanks)

(1)

hydroxyl carboxyl

(ii) An example of this type of reaction is shown.

propan-1-ol → propanoic acid

Draw a structure for the carboxylic acid produced when butan-1-ol reacts with acidified potassium dichromate. (1)

or

CH3CH2CH2COOH

CH3(CH2)2COOH

(iii) Write the formula for potassium dichromate, showing the charge on both ions

You may wish to use the data booklet to help you. (1)

K$zCr207=