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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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gulaghasi [49]

Answer:

$\boxed {\boxed {\sf 10.2 \ kJ}}$

Explanation:

We are asked to find how many kilojoules of energy would be required to heat a block of aluminum.

We will use the following formula to calculate heat energy.

$q=mc \Delta T$

The mass (m) of the aluminum block is 225 grams and the specific heat (c) is 0.897 Joules per gram degree Celsius. The change in temperature (ΔT) is the difference between the final temperature and the initial temperature.

ΔT = final temperature - inital temperature

The aluminum block was heated from 23.0 °C to 73.5 °C.

ΔT= 73.5 °C - 23.0 °C = 50.5 °C

Now we know all three variables and can substitute them into the formula.

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$q= (225 \ g )(0.897 \ J/g \textdegree C)(50.5 \textdegree C)$

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$\frac { 1 \ kJ}{ 1000 \ J}$

Multiply by the answer we found in Joules.

$10192.1625 \ J * \frac{ 1 \ kJ}{ 1000 \ J}$

$10192.1625 * \frac{ 1 \ kJ}{ 1000 }$

$\frac {10192. 1625}{1000} \ kJ$

$10.1921625 \ kJ$

The original values of mass, temperature, and specific heat all have 3 significant figures, so our answer must have the same. For the number we found, that is the tneths place. The 9 in the hundredth place tells us to round the 1 up to a 2.

$10.2 \ kJ$

Approximately 10.2 kilojoules of energy would be required.

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3 years ago

A student prepares a weak acid solution by dissolving 0.2000 g HZ to give 100. mL solution. The titration requires 33.5 mL of 0.

nexus9112 [7]

Answer:

a)M=0.20/(0.335*0.1025)= 0.20/ 0.034 = 5.88 g/mol

b) if 0.100g is used instead of 0.200g

M = 0.1 / 0.034 = 2.94 hence the molar mass will be too low

Explanation:

0.2000 gHZ gives 100ml acid solution

33.5 ml of 0.1025 M NaOH is required to prepare it

the moles = mass / molar mass

mass = 0.200 gHZ

moles = 0.0335*100 * 0.1025 = 0.034

therefore molar mass = mass / moles

M=0.20/(0.335*0.1025)= 0.20/ 0.034 = 5.88

if 0.100g is used instead of 0.200g

M = 0.1 / 0.034 = 2.94 hence the molar mass will be too low

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Answer:

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