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3 years ago

What is represented in each block of the periodic tables?

Chemistry

1 answer:

Len [333]3 years ago

3 0

the answer is c

it wants me to write a 20 letter explanation but ion got time for that

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Which of these is not a precaution taken at nuclear power plants to ensure safety? Safety systems are built into them. All parts

irga5000 [103]

Answer: Enriched uranium is the fuel source.

The nuclear power plants utilizes the radiation energy from the fission of the heavy molecular weight atomic particles. These radiations can cause damage when exposed to the external air, they are capable of causing explosion, mutation in the living beings. Therefore, safety measures should be taken to prevent the damages.

Enriched uranium is the fuel source is not the precaution taken at the nuclear power plant to ensure safety because it is just explaining the fact that the uranium is the source of radiation. All other factors such as safety systems are built into them, all parts are kept in good repair and processes are carefully monitored are relevant precautions.

8 0

3 years ago

A rock has 12.5 percent of its original amount of potassium-40 remaining in it; potassium-40 has a half-life of 1.25 billion yea

igor_vitrenko [27]

A rock has 12.5 percent of its original amount of potassium-40 remaining in it; potassium-40 has a half-life of 1.25 billion years. <span>3.75 billion years ago</span> was the <span>rock formed. the answer is letter C</span>

7 0

3 years ago

Read 2 more answers

If decomposition of 1 mole of ethylene with a gas density of 0.215g/mL starts at 29 degree celcius and the temperature increases

stellarik [79]

We calculate first the initial pressure of the gas.
P = nRT/V
= (0.215 g/mL)(1 mol/16 g)(0.0821 L.atm/mol K)(302K)
= 0.333 atm
Using the relationship between the pressure and temperature,
P1/T1 = P2/T2
Substituting the known values,
(0.333 atm) / (29 + 273) = P2/(950)
P2 = 1.05 atm

7 0

4 years ago

One<br> 63 Cu atom has a mass of 1.045 x 10-22 g. Calculate the mass of 3.0 moles of 63Cu atoms

12345 [234]

The mass of 3.0 moles of ⁶³Cu atoms is 188.8 g

<h3>Stoichiometry</h3>

From the question, we are to calculate the mass of 3.0 moles of ⁶³Cu atoms.

From the given information,

One ⁶³Cu atom has a mass of 1.045 × 10⁻²² g

First, we will determine the number of atoms present in 3.0 moles of ⁶³Cu atoms

Using the formula,

Number of atoms = Number of moles × Avogadro's constant

Number of ⁶³Cu atoms present = 3.0 × 6.022 × 10²³

Number of ⁶³Cu atoms present = 18.066 × 10²³ atoms

Now, we will determine the mass of 18.066 × 10²³ ⁶³Cu atoms

If 1 ⁶³Cu atom has a mass of 1.045 × 10⁻²² g

Then,

18.066 × 10²³ ⁶³Cu atoms will have a mass of 18.066 × 10²³ × 1.045 × 10⁻²²

18.066 × 10²³ × 1.045 × 10⁻²² = 188.7897 g

≅ 188.8 g

Hence, the mass of 3.0 moles of ⁶³Cu atoms is 188.8 g

Learn more on Stoichiometry here: brainly.com/question/13654901

5 0

2 years ago

For the following reaction, 15.4 grams of chlorine gas are allowed to react with 49.6 grams of sodium iodide. chlorine (g) sodiu

mariarad [96]

Answer:

19.3 g of NaCl can be produced

Explanation:

We state the reaction:

Cl₂ (g) + 2NaI (s) → 2NaCl (s) + I₂ (s)

We need to determine limiting reagent:

15.4 g . 1mol /70.9g = 0.217 moles of chlorine

49.6 g . 1mol / 149.89g = 0.331 moles of NaI

Ratio is 1:2. 1 mol of chlorine reacts to 2 moles of NaI

0.217 moles may react to (0.217 . 2)/1 = 0.434 moles of NaI

It is ok to say the NaI is the limting reactant because we need 0.434 moles of it and we only have 0.331.

Ratio is 2:2.

0.331 moles of NaI can produce 0.331 moles of NaCl

We convert mass to moles: 0.331 mol . 58.45g /mol = 19.3 g

3 0

3 years ago