What could be the salt shown in the diagram?

• Sodium carbonate

• Copper (II) sulphate

• Iron (II) sulphate

• Iron (III) nitrate

_______ is an isotope used to detect leakage in underground gas or oil pipelines.

• Sodium-24

• Cobalt-60

• Carbon-14

• Iodine-131

Tags

NGSS.HS-PS1-8

Which of the following is FALSE about isotopes?

• Same nucleon number

• Same proton number

• Different number of neutrons

• Different number of electrons

Tags

NGSS.HS-PS1-8

The method in the diagram can be used to determine empirical formula for..

• magnesium & lead

• copper & calcium

• copper & aluminium

• lead & zinc

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

This scientist found the relationship of the X-ray spectrum with the proton number of each element & arranged the elements in order of increasing proton number. Who is him?

• John Dalton

• Henry Moseley

• Dmitri Mendeleev

• Neils Bohr

Tags

NGSS.HS-PS1-1

Pick two correct properties of Group 17 elements

• Boiling point decreases down the group

• Reactivity decreases down the group

• Electronegativity increases down the group

• Form diatomic molecules

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following is NOT an acidic oxide?

• Carbon dioxide

• Aluminium oxide

• Sulphur dioxide

• Boron oxide

Tags

NGSS.HS-PS1-1

Which of the following is caused by hydrogen bonds?

• Iceberg floating on the surface of the sea

• Metals can conduct electricity while non-metals cannot

• Sticky damp hair strand

• Salt can dissolve in water but not organic solvent

Which of the following salts CANNOT be produced using acid-base titration method?

• Sodium chloride

• Copper (II) nitrate

• Ammonium sulphate

• Potassium carbonate

Choose the correct reagents to test the presence of chloride anion, Cl^-

• Barium chloride, BaCl₂

• Iron (II) sulphate, Fe₂SO₄

• Silver nitrate, AgNO₃

• Nitric acid, HNO₃