Chemistry Chapter 1 Quiz

False (B)

atomicity

<p>three</p> Signup and view all the answers

<p>Water (H2O) = Hydrogen:Oxygen = 1:8 Ammonia (NH3) = Nitrogen:Hydrogen = 14:3 Carbon dioxide (CO2) = Carbon:Oxygen = 3:8</p> Signup and view all the answers

<p>Nanometers (nm) (C)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>IUPAC</p> Signup and view all the answers

<p>Cyprus</p> Signup and view all the answers

<p>$10^{-10}$ m = Atom of hydrogen $10^{-9}$ m = Molecule of water $10^{-8}$ m = Molecule of haemoglobin $10^{-3}$ m = Ant</p> Signup and view all the answers

<p>Atomic mass (D)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>One or two letters of the name of the element (A)</p> Signup and view all the answers

<p>(NH4)2SO4 (D)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>63 u</p> Signup and view all the answers

<p>atoms</p> Signup and view all the answers

<p>Sodium chloride (NaCl) (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>$Na_2O$ = Sodium oxide $AlCl_3$ = Aluminium chloride $Na_2S$ = Sodium sulfide $Mg(OH)_2$ = Magnesium hydroxide</p> Signup and view all the answers

<p>2 (A)</p> Signup and view all the answers

<p>Binary compound (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>CaO</p> Signup and view all the answers

<p>bracket</p> Signup and view all the answers

<p>Al2(SO4)3 = Aluminum sulfate CaCl2 = Calcium chloride K2SO4 = Potassium sulfate KNO3 = Potassium nitrate CaCO3 = Calcium carbonate</p> Signup and view all the answers

<p>MgCl2 (C)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Crossover</p> Signup and view all the answers

<p>Only the units change, the numerical value remains the same. (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Avogadro Number</p> Signup and view all the answers

<p>gram</p> Signup and view all the answers

<p>52 g of He = 13 moles 4 g of He = 1 mole 8 g of He = 2 moles 2 g of He = 0.5 moles</p> Signup and view all the answers

<p>12 g (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>9 g</p> Signup and view all the answers

<p>SO₄</p> Signup and view all the answers

<p>Na₃PO₄ (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>44 g/mol</p> Signup and view all the answers

<p>Na⁺ = +1 SO₄²⁻ = -2 PO₄³⁻ = -3</p> Signup and view all the answers

Molecules consisting of the same type of atoms.

A molecule made up of two atoms of the same element.

A molecule of oxygen consisting of three atoms (O3).

The number of atoms that constitute a molecule.

The mass ratio of elements combined in a compound.

John Dalton was the first to use symbols to represent elements, indicating both the element and a specific quantity.

The size of an atom, typically measured in nanometers (nm), where 1 nm = 1/1,000,000,000 m.

Atoms are measured in nanometers, with 10^-10 m representing the size of a hydrogen atom.

Relative sizes of different structures, with atoms being around 10^-10 m and grains of sand around 10^-4 m.

Names of elements often originated from locations or colors, such as copper from Cyprus and gold from 'yellow'.

The International Union of Pure and Applied Chemistry establishes official names and symbols for chemical elements.

Dalton proposed that every element has a unique atomic mass, an idea central to atomic theory.

Atomic mass is a characteristic property of an element, distinguishing it from others in terms of quantity.

The number of particles in one mole, approximately 6.022 × 10²³.

A unit measuring the amount of substance, equivalent to Avogadro's number of molecules or atoms.

The mass of one mole of a substance, expressed in grams per mole (g/mol).

The molecular mass of H₂O is 18 u, meaning 18 grams equal one mole of water.

The mass of a single atom, usually measured in atomic mass units (u).

The chemical formula for magnesium chloride is MgCl2.

Simplest compounds made from two different elements.

The combining power of an element, usually measured by the number of hydrogen atoms it can combine with.

A technique to combine atomic valencies to balance charges in a compound.

The chemical formula for hydrogen chloride is HCl.

The chemical formula for sodium nitrate is NaNO3.

The chemical formula for aluminium oxide is Al2O3.

The chemical formula for calcium oxide is CaO.

Atomic mass calculation: 1 + 14 + 3 × 16 = 63 u

Sum of atomic masses of all atoms in a formula unit of a compound.

An example of a compound whose mass is calculated as a formula unit.

Calculated by adding the atomic masses of Ca and Cl: 1 × 40.1 + 2 × 35.5.

2H2 + O2 → 2H2O represents water formation.

The atomic mass of oxygen is 16 u.

The atomic mass of hydrogen is approximately 1 u.

Calculated mass of 0.2 mole of oxygen atoms is 3.2 g (O atomic mass = 16 g/mol).

Calculated mass of 0.5 mole of water is 9 g (H2O molar mass = 18 g/mol).

Number of S8 molecules in 16 g of sulphur is 0.5 moles (Molar mass of S8 = 256 g/mol).

There are approximately 0.001 moles of Al ions in 0.051 g of aluminium oxide (Al2O3).

Na is the chemical symbol for sodium, an alkali metal.

The valency of sulphate ion is -2.

Sodium sulphate results from combining 2 sodium ions with 1 sulphate ion.

Formula for sodium phosphate is Na3PO4, combining sodium with phosphate.