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mars1129 [50]
3 years ago
8

How do you write a message?

Chemistry
2 answers:
ch4aika [34]3 years ago
8 0

Answer:

By typing with a keyboard....

Explanation:

Vilka [71]3 years ago
5 0

Answer:

re clear. Try to convey your meaning as simply as possible. Don't over-write or use exorbitant language. ...

Are complete. Include all relevant information. Think about the situation from your readers' perspective. ...

Are correct. Always proofread before sending any message.

Explanation:

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In this equation, which are the reactant(s) Mg(s)+o(g) =Mgo(s)
Mekhanik [1.2K]

Hello,

In the left side, Mg and O are reactants... and MgO is the product....

<em>Hope</em><em> it</em><em> helped</em><em> you</em><em>.</em><em>.</em><em>.</em><em> </em><em>pls</em><em> mark</em><em> brainliest</em>

6 0
3 years ago
(f) what is the observed rotation of 100 ml of a solution that contains 0.01 mole of d and 0.005 mole of l? (assume a 1-dm path
never [62]
<span>Answer: .01 moles of D to .005 moles of L ~ so, .01+.005 = .015 total; using this total value, divide the portions of D and L. so .01/.015 to .005/.015 ~ 67% D to 33% L. And thus, the enantiomer excess will be 34%.</span>
4 0
3 years ago
Read 2 more answers
Drag the correct symbol to the equation. Not all symbols will be used.
nikklg [1K]

Answer:

  • ¹⁰³₄₀ Zr

Explanation:

The nuclear equation from which you have to identify the missing element is:

  • ²³⁹₉₄ Pu + ¹₀n → ___ + ¹³⁴₅₄Xe + 3 ¹₀n

The superscripts to the left of each chemical symbol are the mass number of the atoms (number of protons plus neutrons) and the subscripts to the left of the chemical symbols are the atomic numbers of the atoms (number of protons).

Thus, such equation must be read as "an atom of plutonium-239 is bombarded with a neutron and produces one atom of an unkwon element, one atom of xenon-134, and 3 neutrons".

To find the identity of the missing element you must do two balances: mass number and atomic number.

Mass number:

  • 239 + 1 = A + 134 + 3×1
  • A = 240 - 134 - 3 = 103

Hence, the mass number of the missing element is 103.

Atomic number:

  • 94 + 0 = Z + 54 + 3×0
  • Z = 94 - 54 = 40

Hence, the atomic number of the missing element is 40.

In a periodic table you can find that the element with atomic number 40 is zirconium, Zr.

Thus, the identity of the missing isotope is zirconium-103, ¹⁰³₄₀Zr.

And the complete equation is:

  • ²³⁹₉₄ Pu + ¹₀n →  ¹⁰³₄₀ Zr + ¹³⁴₅₄Xe + 3 ¹₀n
6 0
3 years ago
A sample of N2 gas is contaminated with a gas (A) of unknown molar mass. The partial pressure of each gas is known to be 200 tor
Tju [1.3M]

Answer: The molar mass of gas A is 1.75 g/mol

Explanation:

To calculate the rate of diffusion of gas, we use Graham's Law.

This law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows the equation:

\text{Rate of effusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}

So,

\frac{\text{Rate}_A}{\text{Rate}_{N_2}}=\sqrt{\frac{M_{N_2}}{M_{A}}}

We are given:

Molar mass of nitrogen gas = 28 g/mol

Molar mass of A gas = ? g/mol

Putting values in above equation, we get:

\frac{\text{Rate}_A}{\text{Rate}_{N_2}}=\sqrt{\frac{28}{M_{A}}}\\4=\sqrt{\frac{28}{M_{A}}}

M_{A}=1.75g/mol

Thus molar mass of gas A is 1.75 g/mol

7 0
3 years ago
Any measurement that includes both magnitude and direction is called a
RoseWind [281]

Answer:

Vector

Explanation:

4 0
3 years ago
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