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3 years ago

Can everyone help me :)

Chemistry

2 answers:

vredina [299]3 years ago

7 0

Answer: Joules or calories

GuDViN [60]3 years ago

3 0

Answer:

joules

Heat is the transfer of thermal energy from a system to its surroundings or from one object to another as a result of a difference in temperature. Heat is measured in joules (J).

Explanation: Mrk me brainliest please

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Based on the activity series provided, which reactants will form products? F > Cl > Br > I CuI2 Br2 Right arrow. Cl2 Al

AleksAgata [21]

The reactants based on the reactivity capable of forming the products are $\rm CuI_2\;and\;Br_2$ . Thus, option A is correct.

The reactivity series has been the arrangement of the elements based on their reactivity. The highly reactive element has been capable of replacing the less reactive element in the compound, and form the product.

In the following reactions, the new product has been formed by:

$\rm CuI_2\;and\;Br_2$

From the reactivity series, Br has been more reactive than I, and thereby replaces iodine in the compound for the formation of product.

$\rm Cl_2\;and\;AlF_3$

The compound has been formed with F. Cl has been less reactive than F, and will not be able to form the product.

$\rm Br_2\;and\;NaCl$

The compound has been formed with Cl. Br has been less reactive than Cl, thus will not displaces Cl for the formation of new product.

$\rm CuF_2\;and\;I_2$

The compound has been formed with F. I has been less reactive than F, and will not be able to form the product.

The reactants that will be able to form the products have been $\rm CuI_2\;and\;Br_2$ . Thus, option A is correct.

For more information about the reactivity series, refer to the link:

brainly.com/question/10443908

5 0

3 years ago

A student heats up a substance from 100 C to 145 C, which requires thermal energy of 20000 J. If the mass of the chemical is 100

Readme [11.4K]

Answer:

THE SPECIFIC HEAT CAPACITY IS 4.44 J/G C

Explanation:

Heat energy = 20000 J

Mass = 100 g

Change in temperature = 145 C - 100 C = 45 C

Specific heat capacity = unknown

In calculating the specific heat capacity, we use the formula:

Heat = mass * specific heat capacity * change in temperature

Re-arranging the formula by making the specific heat capacity the subject of the equation, we have:

Specific heat capacity = Heat / mass * change in temperature

Specific heat capacity = 20000 J / 100 g * 45 C

Specific heat = 20000 / 4500

Specific heat = 4.44 J/g C

The specific heat capacity of the substance is therefore 4.44 J/g C

4 0

3 years ago

If 1.320 moles of CH4 reacts completely with oxygen, how many grams of H2O can be formed

Rainbow [258]

Answer:

47.5 g of water can be formed

Explanation:

This is the reaction:

CH₄ + 2O₂ → CO₂ + 2H₂O

Methane combustion.

In this process 1 mol of methane react with 2 moles of oxygen to produce 2 moles of water and 1 mol of carbon dioxide.

As ratio is 1:2, I will produce the double of moles of water, with the moles of methane I have.

1.320 mol .2 = 2.64 moles

Now, we can convert the moles to mass (mol . molar mass)

2.64 mol . 18g/mol = 47.5 g

3 0

4 years ago

Read 2 more answers

Question 13 of 25

avanturin [10]

Answer: is A

Explanation:

how becuase i just take the test

7 0

3 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