The ph of a 0.001 m hcl solution is closest to

a. 1
b. 7
c. 3
d. 10

Answers

Answer 1

Answer: C 3 is the answer because its right

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Where are the alkali metals and the halogens located on the periodic table?

Answers

Alkali: Group 1(I A). Halogens: group 17 (VII A)

According to Hess’s law, if a series of intermediate reactions are combined, the enthalpy change of the overall reaction isthe difference between the enthalpies of the intermediate reactions.
the sum of the enthalpy changes of the intermediate reactions.
the product of the enthalpy changes of the intermediate reactions.
the fraction of the individual enthalpies of the intermediate reactions.

Answers

Answer : The correct option is, the sum of the enthalpy changes of the intermediate reactions.

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

For example :

The formation reaction of CO will be,

$C(graphite)+(1)/(2)O_2(g)\rightarrow CO(g)$ $\Delta H_(formation)$

The intermediate balanced chemical reaction will be,

(1) $C(graphite)+(1)/(2)O_2(g)\rightarrow CO_2(g)$ $\Delta H_1$

(2) $CO+(1)/(2)O_2(g)\rightarrow CO_2(g)$ $\Delta H_2$

The expression for enthalpy of formation of CO is,

$\Delta H_(formation)=[n* \Delta H_1]+[n* \Delta H_2]$

where,

n = number of moles

By adding reaction 1 and reverse reaction of reaction 2, we get the enthalpy of formation of CO.

Hence, the correct option is, the sum of the enthalpy changes of the intermediate reactions.

I think the answer is B. the sum of the enthalpy changes of the intermidiate reactions

3.3 kg aluminum chromate

Answers

this is not a question

A student has a sample of isopropanol (C3H7OH) that has a mass of 78.6 g. The molar mass of isopropanol is 60.1 g/mol. How many moles of isopropanol are contained in this sample?

Answers

Number of moles:

mass of solute / molar mass

78.6 / 60.1 = 1.3078 moles

hope this helps!

What is the volume of 1 mole of H2 at stp? of 1 mole of N2? of 1 mole of O2

Answers

22.4 L for all

hope this helps!

After examining a cell with a microscope, a student concludes that it is a plant cell.What feature did the student most likely observe that led him to this conclusion?
(a) vacuole (c) chloroplast
(b) nucleus (d) cell membrane

Answers

Explanation:

The student most likely observed both (A) Vacuole and (C) Chloroplast that led him to the conclusion, that the cell is a plan cell.

Reason :

In a plant cell, Vacuole occupies 70% to 90% of the total volume of the cell, making it easier to identify.

Chloroplast contains photosynthetic pigment called chlorophyll (green in colour), which is only found in plant cell.

Final answer:

The presence of chloroplasts, containing green pigment chlorophyll for photosynthesis, in the cell likely led the student to conclude it was a plant cell.

Explanation:

The student likely made his conclusion based on observing the presence of chloroplasts in the cell. Chloroplasts contain a green pigment called chlorophyll, which enables plants to undergo photosynthesis and is not found in animal cells. The others listed (vacuoles, cell membrane, and nucleus) are also present in animal cells and therefore would not specifically indicate a plant cell.