Form 5 Chemistry

Which of the following is described as the basic unit of matter?

• Element
• Atom
• Molecule
• Compound

Tags

NGSS.HS-PS1-7

In the atom diagram shown, E is pointing to

• An electron
• a proton
• a neutron
• the nucleus

Tags

NGSS.MS-PS1-1

Which of the following values would represent the pH of a strong base?

• 1

• 8

• 7

• 13

Which of the following values would represent the pH of a strong acid?

• 1

• 6

• 7

• 13

an aqueous soln turns red lithmus blue . excess addition of which of the following would reverse the change

• baking powder
• lime
• ammonium hydroxide solution
• HCL

If an acid is combined with a base of equal strength, the result will most likely be

• a neutral solution.
• a stronger acid.
• impossible to tell without testing the pH.
• a stronger base

Which of the following statements refers to an oxidation process?

• Hydrogen is added to ethene

• Oxygen is removed from carbon dioxide

• Chlorine accepts electrons

• Increase in the oxidation number of magnesium metal

Which of these equations represents a redox reaction?

• Ca(HCO₃)_{2 -->} CaCO₃ + H₂O + CO₂

• CH₃COOH + NaOH --> CH₃COONa + H₂O

• Zn + 2FeCl₃ --> ZnCl₂ + 2FeCl₂

• NaCl + AgNO_{3 -->} AgCl + NaNO₃

Tags

NGSS.HS-PS1-2

Oxidation is....

• Gain of electrons

• Loss of electrons

• Both the loss and gain of electrons

• None of these

What is the oxidation number assigned to manganese in KMnO₄?

• ⁺7

• ⁺2

• ⁺4

• ⁺3

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1