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Musya8 [376]
3 years ago
12

Help with all of these please!

Chemistry
1 answer:
Dovator [93]3 years ago
3 0

Answer:

Is that chemistry ??? Goodnight

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I need help! Please give me an answer
Zepler [3.9K]
You need to show us what you’re talking about first
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A block of aluminum occupies a volume of 15.0 mL and weighs 45 grams.
vladimir2022 [97]
Answer: density equals 3 g/mL

Step by step explanation:

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Are there any parts of the human body that get oxygen directly from the air and not from the blood?
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Answer: Cornea  

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Abbreviated electron configuration for tellurium
Zinaida [17]

Answer:

The ground state electron configuration of ground state gaseous neutral tellurium is [Kr]. 4d10.

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What does Hess's law state can be done in order to be able to react solid magnesium with oxygen gas safely (that is, without exp
aleksley [76]

Answer:

C. The reaction can be broken down and performed in steps

Explanation:

Hess's Law of Constant Heat Summation states that irrespective of the number of steps followed in a reaction, the total enthalpy change for the reaction is the sum of all enthalpy changes corresponding to all the steps in the overall reaction. The implication of this law is that  the change of enthalpy in a chemical reaction is independent of the pathway between the initial and final states of the system.

To obtain MgO safely without exposing magnesium to flame, the reaction sequence shown in the image attached may be carried out. Since the enthalpy of the overall reaction is independent of the pathway between the initial and final states of the system, the sum of the enthalpy of each step yields the enthalpy of formation of MgO.

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