chemistry form 4

Diagram shows the apparatus set-up to determine the empirical formula for an oxide of copper. Gas Z is used to reduce the oxide of copper. What is gas Z?

Rajah menunjukkan susunan radas untuk menentukan formula empirik bagi satu oksida kuprum. Gas Z digunakan untuk menurunkan oksida kuprum itu. Apakah gas Z?

• Oxygen / Oksigen

• Chlorine / Klorin

• Hydrogen / Hidrogen

• Carbon dioxide / Karban dioksida

Which substance has the same number of atoms as 12 g of carbon-12?

Bahan manakah yang mempunyai bilangan atom yang sama dengan 12 g carbon-12?

• 1 mole of sodium chloride, NaCl

  1 mol natrium klorida, NaCl

• 1 mole of ethanol, C₂H₅OH

  1 mol etanol, C₂H₅OH

• 1 mole of chlorine gas, Cl₂

  1 mol gas klorin, Cl₂

• 1 mole of neon, Ne

  1 mol neon, Ne

In the experiment, excess chlorine gas is flown into the combustion tube. A brown solid is produced. What is the mass of the brown solid produced? [Relative atomic mass: Cl = 35.5, Fe = 56]

Dalam eksperimen ini,gas klorin berlebihan dialirkan ke dalam tiub pembakaran. Pepejal perang terbentuk. Apakah jisim pepejal perang yang terbentuk?

• 6.09 g

• 6.86 g

• 9.53 g

• 12.19 g

A sample of carbon dioxide has a mass of 88 g. The relative molecular mass of the gas is 44. Which statements are correct about the sample of carbon dioxide?

Suatu sampel karbon dioksida mempunyai jisim 88 g. Jisim

molekul relatif bagi bagi gas ialah 44. Antara pernyataan berikut, yang manakah benar mengenai sampel karbon dioksida tersebut?

• It contains 2 moles of carbon dioxide molecules

  Mengandungi 2 mol molekul karbon dioksida

• It contains 2 moles of carbon atoms

  Mengandungi 2 mol atom karbon

• It contains 2 moles of oxygen atoms

  Mengandungi 2 mol atom oksigen

• It contains 2 x 6 x 10²³ carbon dioxide molecules

  Mengandungi 2 x 6 x 10²³ molekul karbon dioksida

The formula for Silver [I] chloride is:

• AgCl

• SiCl

• AgCl₂

• AgCl₂

The term used for substances which are formed as a result of chemical reaction

• Reactants

• Catalyst

• Products

• Precipitate

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which out of these will form an anion?

• Ammonium

• Chlorine

• Nickel

• Iron

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following are chemicals that can be easily found at home?

I . Sodium Chloride

II. Glucose

III. Potassium hydroxide

IV. Hydrochloric acid

• I and II

• I and III

• II and III

• III and IV

Who discovered neutrons ?

• Neils Bohr

• James Chadwick

• J.J Thompson

• Ernest Rutherford

A patient is diagnosed with a damage in the thyroid gland. Which isotope is used to treat the patient?

• Copper-64

• Cobalt-60

• Carbon-14

• Iodine-131