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2 years ago

What is 3.5x10^2 x 8.0x10^-2 in scientific notation

1 answer:

6 0

Scientific notation is defined as writing a number between 0 to 10 multiplied by a power of 10
3.5 x 10² x 8.0 x 10⁻²
when we solve the equation
answer - 28
to write in scientific notation the decimal point should come after the first digit from the right. to bring the decimal point from after digit 8 to after digit 2, we have to move one decimal place to the left. then we get 2.8, to get the value as 28 we have to multiply 2.8 by 10
therefore answer is
2.8 x 10¹

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How many total ions are present in 347g of cacl2?

vladimir1956 [14]

In 1 mole of $CaCl_{2}$ , there are 3 moles of ions, 1 mole of Ca^{2+} and 2 mole of $Cl^{-1}$ .

$CaCl_{2}\rightarrow Ca^{2+}+2Cl^{-}$

Molar mass of $CaCl_{2}$ is 110.98 g/mol. Calculating number of moles from given mass as follows:

$n=\frac{m}{M}=\frac{347 g}{110.98 g/mol}=3.12 mol$

Thus, number of moles of ions will be $3\times 3.12 mol=9.38 mol$ .

Since, 1 mole of any substance has $6.023\times 10^{23}$ units of that substance where $6.023\times 10^{23}$ is Avogadro's number.

Thus, 9.38 mol of ions will have $9.38\times 6.023\times 10^{23}=5.65\times 10^{24}$ number of ions.

Therefore, total number of ions in 347 g of $CaCl_{2}$ is $5.65\times 10^{24}$ .

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2 years ago

A base that dissociated entirely into metal ions and hydroxide ions is known as a ________.

viva [34]

Strong base since it is completely soluble

6 0

2 years ago

Eugenol is a molecule that contains the phenolic functional group. Which option properly identifies the phenol in eugenol

givi [52]

Answer:

Explanation:

Hello,

Among the options given on the attached document, since phenolic functional group is characterized by a benzene ring bonded with a hydroxyl group (C₆H₅OH) we can see that the first option correctly points out such description. Thus, answer is on the second attached picture. Other options are related with other sections found in eugenol that are not phenolic.

Best regards.

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2 years ago

How does the equilibrium change to counter the removal of A in this reaction? A + B ⇌ AB

atroni [7]

To counter the removal of A the equilibrium change by shifting toward the left

explanation

If the reaction is at equilibrium and we alter the condition a new equilibrium state is created

The removal of A led to the shift of equilibrium toward the left since it led to less molecules in reactant side which favor the backward reaction.( equilibrium shift to the left)

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2 years ago

Read 2 more answers

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aleksley [76]

Answer

a) A solution with a hydronium molarity of 0.00045 is acidic. True

Doing the calculus of pH

$pH= -Log [H^{+}] = -Log (0.00045)$

b) pH is a way to express the hydronium concentration over a wide range. True

pH means –Log[H+] and this value is used to express a wide range of hydronium concentration sometimes obtaining pH minor than zero.

c) Percent K and Fe are determined by doing ion exchange then a pH titration. False

Usually, Fe is determined by redox titration with potassium permanganate due to it’s more accurate. On the other hand, K is determined usually by volumetric process which includes precipitation like potassium picrate precipitate

d) About 0.2M HCl is the reagent used for the pH titrations. False.

In order to do pH titration, it is possible to use a wide range of HCl concentrations and other acids as reagent if the analyte is a basic compound. Otherwise, if the analyte is an acid compound you should use a basic compound as reagent.

e) A Lewis base is specie that can donate a proton to an acid. False

A Lewis base is an electron pair donor.

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2 years ago