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2 years ago

There are no negative consequences to using nuclear energy. true or false

Chemistry

2 answers:

Travka [436]2 years ago

7 0

False..........
it has so many consequences

Amanda [17]2 years ago

5 0

False hope this helps

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Fictitious element X has an a average atomic mass of 254.9 and only 2 isotopes, One of its isotopes has an abundance of 72.00 an

elena-14-01-66 [18.8K]

Answer:

265.2amu

Explanation:

Given parameters:

Atomic mass = 254.9amu

Abundance of isotope 1 = 72%

Atomic mass of isotope 1 = 250.9amu

Abundance of isotope 2 = 100 - 72 = 28%

Unknown:

Atomic mass of isotope 2 = ?

Solution:

To find the atomic mass of isotope 2, use the expression below:

Atomic mass = (abundance of isotope 1 x atomic mass of isotope 1) + (abundance of isotope 2 x atomic mass of isotope 2)

Now insert the parameters and find the unknown;

254.9 = (0.72 x 250.9) + (0.28 x Atomic mass of isotope 2)

254.9 = 180.648 + 0.28x atomic mass of isotope 2

254.9 - 180.648 = 0.28x atomic mass of isotope 2

74.25 = 0.28 x atomic mass of isotope 2

Atomic mass of isotope 2 = 265.2amu

8 0

2 years ago

What is the difference between a physical change and a chemical change? give examples for both

Tanya [424]

Answer:

Physical change is a temporary change. A chemical change is a permanent change.

Explanation:

A Physical change affects only physical properties i.e. shape, size, etc. Chemical change both physical and chemical properties of the substance including its composition.

7 0

3 years ago

261 nm to millimeters

Komok [63]

The answer is <span>0.000261 millimeters</span>

5 0

2 years ago

The overall cell reaction occurring in an alkaline battery isZn(s) + MnO₂(s) + H₂O(l) → ZnO(s) + Mn(OH)₂(s) (b) If 4.50 g of zin

Airida [17]

5.911 grams of manganese dioxide and 1.224 gram of water are consumed.

<h3>What is Balanced Chemical Equation ?</h3>

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

The given reaction balanced equation is:

Zn(s) + MnO₂(s) + H₂O(l) → ZnO(s) + Mn(OH)₂(s)

<h3>How to find the number of moles ?</h3>

To find the number of moles use the expression:

Number of moles = $\frac{\text{Given mass}}{\text{Molar mass}}$

Here,

Mass of Zn = 4.50 g

Molar mass of Zn = 65.4 g/mol

Now put the value in above expression

Number of moles of Zn = $\frac{\text{Given mass}}{\text{Molar mass}}$

= $\frac{4.5\ g}{65.4\ \text{g/mol}}$

= 0.068 mol

Mass of MnO₂ = Moles of MnO₂ × Molar mass of MnO₂

= 0.068 mol × 86.9368 g/mol

= 5.911 g

Mass of H₂O = Moles of H₂O × Molar mass of H₂O

= 0.068 mol × 18.0 g/mol

= 1.224 g

Thus from the above conclusion we can say that 5.911 grams of manganese dioxide and 1.224 gram of water are consumed.

Learn more about the Balanced chemical equation here: brainly.com/question/26694427

#SPJ4

4 0

1 year ago

Explain one trend on the periodic table and why it is helpful to know

slamgirl [31]

Elements get heavier as the periodic table progresses down the line.

5 0

3 years ago