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irina1246 [14]
3 years ago
13

PLEASE HELP!! 73 POINTS!!

Chemistry
1 answer:
Reil [10]3 years ago
6 0

Answer:

i am sorry i can not help with that there isnt enough information to work with   if you can tell me what you think about the topic i can help you put together a doc

Explanation:

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Calculate the payback time if she insulates the loft with 300 mm insulation when: area of loft space = 100m^2 cost of roll of 10
ycow [4]

Answer: Payback time = 0.0075

Explanation: Since payback time is calculated as:

payback time = \frac{installation cost}{annual savings}

First determine the installation cost:

100 mm thick insulation covers 8.3 m². Then 300 mm covers 24.9 m².

To cover 8.3m² costs £20. Then, the cost to cover 24.9 m² is:

cost = \frac{20*24.9}{8.3}

cost = £60

The cost of putting the insulation is £120, so the total cost is:

total cost = £60 + £120

total cost = £180

Savings per year per 100 mm thick is £80. For 300 mm, the value of annual savings is:

savings = \frac{300*80}{100}

savings = 240

payback time = \frac{installation cost}{annual savings}

payback time = \frac{180}{240}

payback time = 0.75

8 0
3 years ago
Copper is a metal with the ability to conduct electricity, so copper wires are often used in small household appliances. The abi
gtnhenbr [62]

Answer:

physical property

Chemical property

melting point

Reactivity with a strong acid

Explanation:

The ability to conduct electricity is a physical property of copper. Most electrical cables are made of copper owing to its high electrical conductivity.

The rusting of iron is a chemical reaction. Rust is actually hydrated iron III oxide. Hence it is a chemical property of iron.

The melting points of metals can be used to classify them. The greater the density of metals, the higher their melting point.

The ability of metals to react with acids separates metals into highly reactive, moderately reactive and unreactive metals.

7 0
2 years ago
How much carbon dioxide in kilograms is produced upon the complete combustion of 29.4 L of propane (approximate contents of one
Novosadov [1.4K]

Answer:

61kg

Explanation:

Like all other hydrocarbons, the combustion of propane will yield water and carbon iv oxide.

Let’s write a complete and balanced chemical equation for this.

C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(l)

Now, we first convert the information into a mass.

We know that mass = density * volume

Let’s convert the volume here into ml since density is in mL. It must be remembered that 1000ml = 1L. Hence, 29.4L = 29,400ml

The mass is thus = 0.6921 * 29,400 = 20,347.74g

Now from the balanced equation, we can see that one mole of propane produced 3 moles of carbon iv oxide. This is the theoretical relation.

Let’s now calculate the actual number of moles. The number of moles of propane produced is the mass of propane divided by the molar mass of propane. The molar mass of propane is 3(12) + 8(1) = 36 + 8 = 44g/mol

The number of moles = 20,347.74/44 = 462.44

We simply multiply this number by 3 to get the actual number of moles of carbon dioxide produced. This is equals 1387.35 moles

Since we know this, we now calculate the mass of carbon iv oxide produced. The mass is equals the number of moles multiplied by the molar mass. The molar mass of carbon iv oxide is 44g/mol.

The mass produced is thus 1387.35 * 44 = 61,043g

To get the kilogram equivalent, we simply divide by 1000 = 61,043/1000 = 61kg

6 0
3 years ago
Emi wants to see if she can melt a marshmallow in the sun. She plans to put the marshmallow in a container that will cause it to
konstantin123 [22]

Answer:

I think emi should put it in a metal container and put it in the direction of the sun cause this will help produce heat as the sun shines on the metal container

3 0
2 years ago
What is Rubisco and its relationship to photosynthesis?
xenn [34]

Rubisco is a super important enzyme in plants that first captures CO2 to begin the process of the Calvin cycle. It's the most important enzyme by far because it starts the entire process of Carbon Fixation.

8 0
3 years ago
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