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Fed [463]
3 years ago
10

How did Mendeleev arrange the known elements?

Chemistry
2 answers:
Agata [3.3K]3 years ago
4 0
In order of relative atomic mass.
klemol [59]3 years ago
4 0
Mendeleev arranged elements in rows in increasing order according to their atomic number, while also grouping elements with similar chemical properties in columns.
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During surgery, a patient receives 3.5 pt of plasma. How many milliliters of plasma were given?
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Answer:

1656.116

Explanation:

473.176 is how many millimetres equals a pint and you would multiply that by 3.5

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If the stocks in a system always decrease and never increase, the system has what type of feedback loop? (Select the best answer
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Write the net ionic equation for the precipitation of calcium sulfide from aqueous solution
Fantom [35]

Answer:

Answer is Ca2+(aq)+S2-(aq)=>CaS(s)

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I hope it's helpful!

7 0
3 years ago
I want to know the steps.
Artyom0805 [142]

The answer for the following problem is described below.

<em><u> Therefore the standard enthalpy of combustion is -2800 kJ</u></em>

Explanation:

Given:

enthalpy of combustion of glucose(ΔH_{f} of C_{6}H_{12} O_{6}) =-1275.0

enthalpy of combustion of oxygen(ΔH_{f} of O_{2}) = zero

enthalpy of combustion of carbon dioxide(ΔH_{f} of CO_{2}) = -393.5

enthalpy of combustion of water(ΔH_{f} of H_{2} O) = -285.8

To solve :

standard enthalpy of combustion

We know;

ΔH_{f}  = ∈ΔH_{f} (products) - ∈ΔH_{f} (reactants)

C_{6}H_{12} O_{6} (s) +6 O_{2}(g) → 6 CO_{2} (g)+ 6 H_{2} O(l)

ΔH_{f} = [6 (-393.5) + 6(-285.8)] - [6 (0) + (-1275)]

ΔH_{f} = [6 (-393.5) + 6(-285.8)] - [0 - 1275]

ΔH_{f} = 6 (-393.5) + 6(-285.8)  - 0 + 1275

ΔH_{f} = -2361 - 1714 - 0 + 1275

ΔH_{f} =-2800 kJ

<em><u> Therefore the standard enthalpy of combustion is -2800 kJ</u></em>

7 0
2 years ago
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