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IGCSE Chemistry > Chemical Formulae > Flashcards

Chemical Formulae Flashcards

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1
Q

True or False: A molecular formula shows the actual number of atoms of each element in a molecule.

A

True

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2
Q

What does the empirical formula represent?

A

The simplest whole-number ratio of atoms of each element in a compound.

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3
Q

Fill in the blank: The chemical formula for water is _____.

A

H2O

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4
Q

Which of the following is a correct empirical formula for glucose (C6H12O6)?
A) C2H4O2
B) CH2O
C) C6H12O6
D) C3H6O3

A

B) CH2O

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5
Q

What type of bond is present in a molecule of NaCl?

A

Ionic bond

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6
Q

True or False: The formula for a compound always reflects its molecular structure.

A

False

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7
Q

What is the significance of the subscripts in a chemical formula?

A

They indicate the number of atoms of each element in a molecule.

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8
Q

Fill in the blank: The chemical formula for carbon dioxide is _____.

A

CO2

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9
Q

What is the difference between a molecular formula and an empirical formula?

A

A molecular formula shows the actual number of atoms, while an empirical formula shows the simplest ratio.

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10
Q

What does the prefix ‘di-‘ in a chemical name indicate?

A

That there are two atoms of that element in the molecule.

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11
Q

True or False: All compounds have both a molecular formula and an empirical formula.

A

True

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12
Q

What is the chemical formula for ammonia?

A

NH3

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13
Q

Which of the following represents a covalent compound?
A) NaCl
B) H2O
C) CaO
D) MgCl2

A

B) H2O

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14
Q

Fill in the blank: The chemical formula for sulfuric acid is _____.

A

H2SO4

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15
Q

What is the chemical formula for sodium bicarbonate?

A

NaHCO3

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16
Q

What do the coefficients in a balanced chemical equation represent?

A

The number of molecules or moles of each substance involved in the reaction.

17
Q

True or False: The formula for a compound can change based on the conditions it is under.

A

False

18
Q

What is the formula for the carbonate ion?

A

CO3^2−

19
Q

Fill in the blank: The chemical formula for ethanoic acid (acetic acid) is _____.

A

CH3COOH

20
Q

Alkali + acid ⎯⎯>
NaOH + HCl

A

salt + water
NaCl + H2O

21
Q

Metal carbonate ⎯⎯>
NaHCO3 ⎯⎯>

A

metal oxide + CO2
NaO + CO2

22
Q

Metal hydroxide ⎯⎯>
NaOH ⎯⎯>

A

metal oxide + water
NaO + H2O

23
Q

Metal nitrate ⎯⎯>
2KNO3 ⎯⎯>

A

metal oxide + nitrogen dioxide + oxygen
2K2O + 2NO2 + 5O2

IGCSE Chemistry (4 decks)

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