Practical Chemistry

Add about 1 cm³ of solution P into a clean test-tube.
To this test-tube, add about 1 cm³ of solution Q and shake the mixture thoroughly until no further change is seen.
To the same test-tube, slowly add about 1 cm³ of solution R, with shaking, until no further change is seen.
Which one is NOT a possible outcome?

• Observation of colour change

• Observation of ppt. formed

• Prepare limewater to test for gas when effervescence is seen

• Prepare lighted splint to test for gas when effervescence is seen

Tags

NGSS.MS-PS1-2

M is a mixture of two salts X and Y. Salt X is soluble in water. Salt Y is insoluble in water but dissolves in nitric acid.

How many different types of ions might there be? [Tick all that apply.]

• 2

• 3

• 4

• 5

To about 2 cm³ of the filtrate, add aqueous sodium hydroxide dropwise, with shaking, until no further change is observed.

What is this step testing for?

Tags

NGSS.MS-PS1-2

Acid Y is known to be either hydrochloric or sulfuric acid. Carry out suitable tests to determine the anion in Y.

Evaluate responses using AI:

OFF

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Match the following properties with their classification as either an intensive or extensive property.

• Temperature at which an object changes from solid to liquid

• Mass

• Appearance of an object

• Silver

• Amount of matter in an object

• Melting point

• Color of an object

• Metallic

To about 2 cm³ of the solution, add in zinc powder. Allow the mixture to stand for a few minutes before recording your observations.

Which of the possible reactions may occur? [Tick all that apply.]

• Neutralisation

• Displacement

• Decomposition

• Redox

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

To about 2 cm³ of the solution, add in zinc powder. Allow the mixture to stand for a few minutes before recording your observations. Which of the following is a possible observation? [Tick all that apply.]

• Zinc powder dissolves.

• Effervescence seen. Lighted splint extinguishes with a 'pop' sound.

• Effervescence seen. White ppt formed in limewater.

• Solution turns from blue to colourless.

• Brown ppt forms/ brown residue settles at the bottom of the test tube.

Tags

NGSS.MS-PS1-2

Place about 2 cm³ of solution Z in a clean test-tube.

Add one spatula-load of solid sodium chloride.

Which is a possible observation? [Tick all that apply.]

• Effervescence seen. White ppt formed in limewater.

• Effervescence seen. Moist red litmus paper turns blue.

• White solid dissolves to form a colourless solution.

• Blue solution decolourises.

Tags

NGSS.MS-PS1-2

Remove the stopper from the test-tube labelled solid salt P. Heat this test-tube gently and then more strongly until no further changes are seen.

Observation:

On gentle heating, P melts.

On strong heating, the colourless liquid turns pale yellow and a colourless and odourless gas is produced which relights a glowing splint.

On cooling, the yellow liquid changes into a white solid.

Rewrite the sentence which is has not presented the observation accurately.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

When you see reagents like 'potassium iodide' and 'acidified potassium manganate(VII)', what main reaction would you expect?

• Displacement

• Neutralisation

• Decomposition

• Redox

Tags

NGSS.MS-PS1-2