Science 10 Final Exam Review: WHMIS Symbols Matching
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Questions and Answers

What WHMIS symbol represents flammable and combustible materials?

  • e) Poisonous and infectious materials causing immediate and serious toxic effects
  • c) Materials causing other toxic effects
  • d) Dangerously reactive materials
  • b) Compressed gas (correct)

What is the atomic number of the element with the mass number 14?

  • 10 (correct)
  • 16
  • 6
  • 8

What is the name of the ion with the symbol Cl-?

  • Fluorine
  • Chlorine (correct)
  • Oxygen
  • Sulfide

What is the name of the ionic compound with the formula MgCl2?

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

What is the chemical formula for the ionic compound named aluminum oxide?

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

What is the chemical formula for the molecular compound named sulfur dioxide?

<p>$SO2(g)$ (B)</p> Signup and view all the answers

What type of chemical reaction occurs in the equation: solid mercuric oxide → liquid mercury + oxygen gas?

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

In the equation: solid calcium carbonate → solid calcium oxide + carbon dioxide gas, how many moles of solid calcium carbonate are needed to produce 2 moles of carbon dioxide gas?

<p>1 mole (A)</p> Signup and view all the answers

What is the molar mass of NaCl(s)?

<p>58.44 g/mol (D)</p> Signup and view all the answers

What is the type of chemical reaction represented by the equation: _____ Cu(s) + _____ S(s) → _____ Cu2S(s)?

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

In the equation: _____ KCl(s) → _____ K(s) + _____ Cl2(g), what is the coefficient for KCl(s) when the equation is balanced?

<p>1 (C)</p> Signup and view all the answers

What is the molar mass of Pb(NO3)2(s)?

<p>254.20 g/mol (B)</p> Signup and view all the answers

How many moles of Ag2SO4(s) are present in 77.95g of the substance?

<p>0.30 moles (B)</p> Signup and view all the answers

What is the molar mass of CH3COOH(l)?

<p>58.08 g/mol (B)</p> Signup and view all the answers

In the equation: _____ Fe2O3(s) + _____ H2(g) → _____ Fe(s) + ______ H2O(l), what type of chemical reaction is being represented?

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

In the equation: _____ FeCl3(aq) + _____ NaOH(aq) → _____ Fe(OH)3(s) + _____ NaCl(s), what is the coefficient for Fe(OH)3(s) when the equation is balanced?

<p>3 (D)</p> Signup and view all the answers

Flashcards

Decomposition reaction

A chemical reaction in which a single reactant breaks down into two or more products. For example, the decomposition of hydrogen peroxide (H2O2) into water (H2O) and oxygen (O2).

Combination reaction

A chemical reaction in which two or more reactants combine to form a single product. For example, the reaction of sodium (Na) with chlorine (Cl2) to form sodium chloride (NaCl).

Redox reaction

A chemical reaction in which electrons are transferred between reactants. For example, the reaction of iron (Fe) with copper(II) sulfate (CuSO4) to form copper (Cu) and iron(II) sulfate (FeSO4).

Molar mass

The mass of one mole of a substance. It is expressed in grams per mole (g/mol). For example, the molar mass of water (H2O) is 18.015 g/mol.

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Moles

The number of moles of a substance in a given mass. It can be calculated by dividing the mass of the substance by its molar mass. For example, a 10 g sample of sodium chloride (NaCl) contains 0.17 moles of NaCl.

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Cl

The symbol for the element chlorine, which has an atomic number of 17.

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Cl-

The ion formed when a chlorine atom gains one electron. It has a charge of -1.

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MgCl2

The chemical formula for magnesium chloride, a salt commonly used in de-icing roads.

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Al2O3

The chemical formula for aluminum oxide, a compound found in bauxite ore.

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SO2

The chemical formula for sulfur dioxide, a gas with a pungent odor.

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Atomic number

The atomic number of an element is the number of protons in the nucleus of an atom of that element. It is a unique identifier for each element. For example, the atomic number of carbon is 6.

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Mass number

The mass number of an element is the sum of the number of protons and neutrons in the nucleus of an atom of that element. For example, the mass number of carbon-12 is 12.

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Element with mass number 14

The symbol for the element with the mass number 14 is nitrogen (N).

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Element with atomic number 10

The symbol for the element with the atomic number 10 is neon (Ne).

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Study Notes

Chemical Symbols and Compounds

  • The WHMIS symbol for flammable and combustible materials is represented by a flame icon.
  • The element with a mass number of 14 is silicon (Si), which has an atomic number of 14.
  • The ion with the symbol Cl- is called chloride.

Ionic Compounds

  • The ionic compound with the formula MgCl2 is named magnesium chloride.
  • Aluminum oxide has the chemical formula Al2O3.
  • Sulfur dioxide is represented by the chemical formula SO2.

Chemical Reactions

  • The reaction of solid mercuric oxide producing liquid mercury and oxygen gas is a decomposition reaction.
  • To produce 2 moles of carbon dioxide gas from solid calcium carbonate (CaCO3), 2 moles of solid calcium carbonate are needed.

Molar Mass and Balancing Equations

  • The molar mass of sodium chloride (NaCl) is approximately 58.44 g/mol.
  • The reaction represented by Cu(s) + S(s) → Cu2S(s) is a synthesis reaction.
  • In the balanced equation KCl(s) → K(s) + Cl2(g), the coefficient for KCl(s) is 2.

More Molar Mass and Reactions

  • The molar mass of lead(II) nitrate (Pb(NO3)2) is approximately 331.2 g/mol.
  • To find the number of moles in 77.95g of silver sulfate (Ag2SO4), the molar mass is needed; it is approximately 311.8 g/mol leading to about 0.25 moles.
  • The molar mass of acetic acid (CH3COOH) is approximately 60.05 g/mol.
  • The reaction Fe2O3(s) + H2(g) → Fe(s) + H2O(l) is a reduction reaction.
  • In the equation FeCl3(aq) + NaOH(aq) → Fe(OH)3(s) + NaCl(s), the coefficient for Fe(OH)3(s) when balanced is 1.

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Test your knowledge of Workplace Hazardous Materials Information System (WHMIS) symbols by matching the numbers to the appropriate WHMIS symbol for different types of hazardous materials.

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