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3 years ago

For each of the following

Chemistry

2 answers:

baherus [9]3 years ago

6 0

Answer:

1. Skeleton: Ca + H₂O ⇒ H₂ + Ca(OH)₂

Balanced: Ca + 2H₂O ⇒ H₂ + Ca(OH)₂

Type: Single displacement / single replacement

2. Skeleton: Al + O₂ ⇒ Al₂O₃

Balanced: 4Al + 3O₂ ⇒ 2Al₂O₃

Type: Synthesis

3. Skeleton: H₂SO₄ + NaOH ⇒ Na₂SO₄ + H₂O

Balanced: H₂SO₄ + 2NaOH ⇒ Na₂SO₄ + 2H₂O

Type: Double displacement / double replacement

4. Skeleton: NaClO₃ ⇒ NaCl + O₂

Balanced: 2NaClO₃ ⇒ 2NaCl + 3O₂

Type: Decomposition

5. Skeleton: AgNO₃ + K₃PO₄ ⇒ Ag₃PO₄ + KNO₃

Balanced: 3AgNO₃ + K₃PO₄ ⇒ Ag₃PO₄ + 3KNO₃

Type: Double displacement / double replacement

6. Skeleton: Cu(OH)₂ + Al ⇒ Al(OH)₃ + Cu

Balanced: 3Cu(OH)₂ + 2Al ⇒ 2Al(OH)₃ + 3Cu

Type: Single replacement / single displacement

7. Skeleton: Mg + P₄ ⇒ Mg₃P₂

Balanced: 6Mg + P₄ ⇒ 2Mg₃P₂

Type: Synthesis

8. Skeleton: KNO₃ + PbI₂ ⇒ KI + Pb(NO₃)₂

Balanced: 2KNO₃ + PbI₂ ⇒ 2KI + Pb(NO₃)₂

Dimas [21]3 years ago

4 0

Answer:

1) Calcium metal and water react, giving hydrogen gas and calcium hydroxide

• Ca(s) + H2O Ca(OH)2 (aq) + H2(g)

• Ca(s) + 2H2O Ca(OH)2 (aq) + H2(g)

• Exothermic combination reaction

2) aluminum metal quickly reacts with the oxygen in the air to produce aluminum oxide

• Al + 02 = Al2O3

• 4 Al + 302 = 2Al2O3

• Combination reaction

3) Hydrogen sulphate (sulphutic acid) and sodium hydroxide react, producing sodium sulphate and water.

• NaOH + H2SO4 = Na2SO4 + 2H2O

• 2NaOH + H2SO4 = Na2SO4 + 2H2O

• Double Displacement reaction

4) sodium chloride and oxygen are produced by heating sodium chlorate.

• NaclO3 = NaCl + O

• 2NaclO3 = 2NaCl + 3 O

• Decomposition reaction

6) aluminum oxide and copper metal are the products of a reaction between copper (II) oxide and aluminum metal.

• Al + CuO = Al2O3 + Cu

• 2 Al + 3CuO = Al2O3 + 3 Cu

• Oxidation and Reduction

8) lead (II) nitrate and potassium iodide react producing lead (II) iodide a bright yellow precipitate and potassium nitrate which stays in solution.

• Pb(No3)2 +KI = PbI2 + KNO3

• Pb(No3)2 +2KI = PbI2 + 2KNO3

• Double displacement reaction

Explanation:

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<h3>What is the half-life of a radioactive material?</h3>

The half-life of a radioactive material is the time taken for half the atoms present in the material to decay or disintegrate.

The half-life, $t_\frac{1}{2}$ , the age, t, and amount remaining, $A_{r}$ , of a radioactive material are related by the formula below:

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For the Aboriginal charcoal with 22% of its original carbon-14 atoms:

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For the Mayan headdress with 79% of its original carbon-14 atoms:

$t = \frac{6000*0.79}{-0.63} = 2040\:years$

Neanderthal skull with 3% of its original carbon-14 atoms:

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Therefore, the age in years of the Egyptian papyrus, the Aboriginal charcoal, the Mayan headdress, and the Neanderthal skull are 4000 years, 13106.5years , 2040 years, and 30353 years respectively.

Learn more about half-life at: brainly.com/question/26689704

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