I need some help with this

Answer:

2320 J

Explanation:

We'll begin by calculating the change in temperature of the copper. This can be obtained as follow:

Initial temperature (T₁) = 28.0 °C

Final temperature (T₂) = 99.0 °C

Change in temperature (ΔT) =?

ΔT = T₂ – T₁

ΔT = 99 – 28

ΔT = 71 °C

Finally, we shall determine the heat absorbed by the copper. This can be obtained as follow:

Mass of copper (M) = 85 g

Change in temperature (ΔT) = 71 °C

Specific heat capacity (C) = 0.385 J/K.g

Heat (Q) absorbed =?

Q = MCΔT

Q = 85 × 0.385 × 71

Q = 2320 J

Thus, the heat absorbed is 2320 J

Answer:

Explanation:

A. [Ni(en)₃]²⁺  --------- Violet

B. [Ni(H₂O)₆]⁺² -------Green

C. [Ni(NH₃)₅]⁺² ---------Blue .

Answer:

0.5M

Explanation:

Molarity = Mols/ Liters

so 2/4

0.5 M

Answer:

1451.42 g

Explanation:

Let assume that the mass of ocean water comprises 3.5%

NaCl = 3.5%

[tex]3.5 = \dfrac{50.8}{mass \ of \ ocean \ water } \times 100[/tex]

[tex]mass \ of \ ocean \ water = \dfrac{50.8}{3.5 } \times 100[/tex]

mass of the ocean water = 1451.42 g

Answer:

B. Ca(NO3)2

Explanation:

edg 2022

Answer:

b

Explanation:

Answer:

See whole explanation to understand

Explanation:

the reason why there is such a large jump from 2nd to 3rd ionization energy for calcium is because to remove the third electron, a larger amount of energy is required, since the shell is closer to the nucleus, and higher attraction exists between them. This is why the second ionization energy is 1125.4 and then the third IE is 4912.4 which is a very big difference. It's all about the elections and energy!!

Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, higher attraction between shell and nucleus, there is such a large jump from 2nd to 3rd ionization energy.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.

The reason why there is such a large jump from 2nd to 3rd ionization energy for calcium is because to remove the third electron, a larger amount of energy is needed, since the shell is closer to the nucleus, and higher attraction exists between them.

Therefore, higher attraction between shell and nucleus, there is such a large jump from 2nd to 3rd ionization energy.

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Answer:

hope it helps you

Answer:

Chemical symbols are used to standardize the 'language of chemistry' and to identify elements and atoms in a chemical formula easily. Chemical symbols consist of one or two letters, most often derived from the name of the element.

Explanation:

Answer:

Explanation:

A chemical symbol is a notation of one or two letters representing a chemical element. Its used to  identify elements and atoms in a chemical formula easily. Chemical symbols consist of one or two letters, most often derived from the name of the element.

Cathode: 2 Ag+ (aq) + 2 e- → 2 Ag (s). Anode: 2 H+ (aq) → H2 (g) + 2 e-.

What is cathode ?

A cathode is an electrode in an electrical circuit from which electrons flow out. It is usually made of metal and is negatively charged. Cathodes are commonly used in electronic devices such as batteries, lamps, and vacuum tubes. In a battery,

the cathode is the terminal which provides a negative charge and is usually connected to the negative terminal of the battery. In a vacuum tube, the cathode is the source of electrons which flow through the tube to the anode, which is the positive terminal.

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Answer:

Because when they unfreeze and are cooled they would block pipes of the air liquefaction plant and make the air colder, hope this helps!!

Answer:

0.369M

Explanation:

[tex]\boxed{Molarity = mole \div volume}[/tex]

☆ Volume has to be in litres

Molarity of solution

= 0.99 ÷2.5

= 0.369 M

Answer:

b

Explanation:

mark me brainliest pls

Answer:

b

Explanation:

bc

Answer:

Wash hands and surfaces often. Harmful bacteria can spread throughout the kitchen and get onto cutting boards, utensils, and counter tops. To prevent this: Wash hands with soap and hot water before and after handling food, and after using the bathroom, changing diapers; or handling pets.

"Certainly no muscular fatigue to sustain, while it procures for him good, unfailing wages, besides a healthy workshop gratis."

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Answer:

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Answer:

Just use a text book.. So that you get the concept

Answer:

[tex][CO]=[Cl_2]=0.01436M[/tex]

[tex][COCl_2]=0.00064M[/tex]

Explanation:

Hello there!

In this case, according to the given chemical reaction at equilibrium, we can set up the equilibrium expression as follows:

[tex]K=\frac{[CO][Cl_2]}{[COCl_2]}[/tex]

Which can be written in terms of x, according to the ICE table:

[tex]0.32=\frac{x^2}{0.015M-x}[/tex]

Thus, we solve for x to obtain that it has a value of 0.01436 M and therefore, the concentrations at equilibrium turn out to be:

[tex][CO]=[Cl_2]=0.01436M[/tex]

[tex][COCl_2]=0.015M-0.01436M=0.00064M[/tex]

Regards!

Answer:

T₂ = 128.19 K

Explanation:

Given that,

The initial volume, V₁ = 12.5 ft³

Initial temperature, T₁ = -173 °C = 100.15 K

Final volume, V₂ = 16 ft³

We need to find the new temperature. The relation between temperature and volume is given by :

[tex]V\propto T\\\\\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}[/tex]

Put all the values,

[tex]T_2=\dfrac{T_1V_2}{V_1}\\\\T_2=\dfrac{100.15\times 16}{12.5}\\\\T_2=128.19\ K[/tex]

So, the new temperature is 128.19 K.

A chemist morning commute is 40.2 kilometers. Given an average speed pf 60.5 mph, 0.66 minutes will it take him to arrive at work.

The overall distance the object covers in a given amount of time is its average speed. A scalar value represents the average speed. It has no direction and is indicated by the magnitude.

If you know how far something has travelled and how long it took to get there, you can calculate its average speed. Speed is calculated as follows: speed = distance * time.

Distance = speed × time

40.2 = 60.5 × time

time = 40.2 / 60.5

= 0.66 minutes

Thus, A chemist morning commute is 40.2 kilometers. Given an average speed pf 60.5 mph, 0.66 minutes will it take him to arrive at work.

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Answer:

0.0845 M

Explanation:

First we convert 4.27 grams of potassium iodide into moles, using its molar mass:

Now we calculate the molarity of the solution, using the number of moles and the given volume:

45 g

the solubility of KCl in water at 60 degree c is 45.5g per 100g of water

Answer:

11.45

Explanation:

The ph is just 14-pOH so

14-2.55=ph=11.45

Answer: on

Explanation:5

The price of sodium chloride per 5 kg is 179 dollars. The experiment requires 65 g of NaCl. The price of65 g or 0.065 kg is 2.3 dollars.

Sodium chloride is an ionic compound formed by the combination of sodium metal and chlorine atom. Sodium metal has extra one electron in its valance shell and chlorine needs one more electron into its valence shell. Hence sodium donates its valence electron to chlorine forming NaCl.

NaCl is used as the table salt in food. It is a very important compound in our daily diet. Similarly NaCl is industrially important for many reaction especially in electrochemical processes.

It is given that, the price of 5 kg of NaCl = $179

required mass of NaCl = 65 g = 0.065 Kg

then , price of 0.065 kg = (0.065 × 179 /5) =  $2.31

Therefore, the cost of NaCl in the experiment is 2.31 dollars.

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A. water lily

It is a plant. Plants are autotrophs. They make their own food.

Answer:

i am not sure with the answer.

but i think it will be water lily Or insects

Answer:

57.4 g/mol

Explanation:

Step 1: Convert 450 cm³ to L

We will use the conversion factors 1 cm³ = 1 mL and 1000 mL = 1 L.

450 cm³ × 1 mL/1 cm³ × 1 L/1 mL = 0.450 L

Step 2: Convert 23 °C to Kelvin

We will use the following expression.

K = °C + 273.15 = 23 + 273.15 = 296 K

Step 3: Calculate the number of moles of the gas

We will use the ideal gas equation.

P × V = n × R × T

n = P × V / R × T

n = 700 mmHg × 0.450 L / (62.4 mmHg.L/mol.K) × 296 K = 0.0171 mol

Step 4: Calculate the molar mass of the gas

0.982 g of the gas correspond to 0.0171 moles.

M = 0.982 g/0.0171 mol = 57.4 g/mol

Answer:

Volume of O₂ = 200cm³

Explanation:

Rate of diffusion of gas is directly and inversely proportional to the volume and time taken for the gas to diffuse completely.

Volume

R = -----------

time

let R₁ represent the rate at which the given volume of hydrogen gases diffuses and R₂ represent the rate at which the the volume of the oxygen gas diffused.

V₁, V₂, T₁ and T₂ follows the same process

If the two gases diffuses at the same rate, then;-

R₁ = R₂

V₁ V₂

---------- = ------------

T₁ T₂

V₂

10 = ----------------

20

V₂ = 20•10

V₂ = 200cm³

Therefore, the volume of oxygen that could diffuse in 20 seconds is 200cm³