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3 years ago

Consider the two electron arrangements for neutral atoms A and B. Are atoms A and B the same element?

Chemistry

2 answers:

Vlad [161]3 years ago

8 0

Technically yes but no because you have to fill the 3s orbital before the 5s orbital.

Reil [10]3 years ago

8 0

Look at the last part of the B element, it is not the correct electron level compared to A, so therefore,...

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1. Which of the following elements is a transition metal?

Orlov [11]

Where are the following elements to choose from?

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3 years ago

Read 2 more answers

What must happen to uranium before it can be used as a fuel source?

Otrada [13]

Answer:

Uranium must be purified before it is used as a fuel source

Explanation:

The purer the uranium sample, the more the concentration of uranium in the fuel is.

Whenever uranium is extracted from nature, it contains a lot of impurities. Only a few special nuclear reactors can utilize uranium in this raw state. most of the others have to get uranium to become about 3% pure before they begin using it.

To do this, uranium has to be passed through a series of chemical reactions all with the aim of extracting the other compounds that may be present in the fuel.

5 0

3 years ago

answer the following question by entering the numeric value with appropriate units. if the length of one side of a square is 12.

Tasya [4]

Using the length given '12 m', because the shape of the object is a square all sides are congruent.
Basically 12+12+12+12=48 or 12 x 4= 48
The answer is 48 m

8 0

3 years ago

How can you measure the volume of air inside of a balloon?

Pani-rosa [81]

You could let the air out of the balloon while it is under the water with a container filled with water upside down over it. And measure the water displacement.

8 0

3 years ago

A sample of food containing 27 g of fat, 48 g of carbohydrates and 20 g of protein is burned in a bomb calorimeter. In a perfect

rosijanka [135]

Answer:

38.3958 °C

Explanation:

As,

1 gram of carbohydrates on burning gives 4 kilocalories of energy

1 gram of protein on burning gives 4 kilocalories of energy

1 gram of fat on burning gives 9 kilocalories of energy

Thus,

27 g of fat on burning gives 9*27 = 243 kilocalories of energy

20 g of protein on burning gives 4*20 = 80 kilocalories of energy

48 gram of carbohydrates on burning gives 4*48 = 192 kilocalories of energy

Total energy = 515 kilocalories

Using,

$Q=m_{water}\times C_{water}\times (T_f-T_i)$

Given: Volume of water = 23 L = 23×10⁻³ m³

$Density=\frac{Mass}{Volume}$

Density of water= 1000 kg/m³

So, mass of the water:

$Mass\ of\ water=Density \times {Volume\ of\ water}$

$Mass\ of\ water=1000 kg/m^3 \times {0.023\ m^3}$

Mass of water = 23 kg

Initial temperature = 16°C

Specific heat of water = 0.9998 kcal/kg°C

$515=23\times 0.9998\times (T_f-16)$

Solving for final temperature as:

<u>Final temperature = 38.3958 °C </u>

8 0

3 years ago