2.0 cm + 2.6 cm + 4.2 mm =

Please show work

Answers

Answer 1

Answer: Hi ;)!
So:
4.2 mm (/10) = 0.42 cm

2.0 cm + 2.6 cm + 0.42 cm = 5.02 cm ;)

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In the metric system, which of the following is correct?1,000 liters = 1 milliliter
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100 centimeters = 1 meter

Answers

100 centimeters = 1 meter

Answer:

100 centimeters = 1 meter

After creating a Beer's Law plot using standard solutions of Q, you determined the slope of Beer's Law to be 0.543 M-1. Your unknown solution of Q tested in Part B of the experiment had an absorbance of 0.144. Determine the concentration (in molarity) of the unknown solution Q from Part B. Do not use scientific notation or units in your response. If Carmen adds zeros after the decimal place, your answer will still be graded correctly.

Answers

Answer : The concentration (in molarity) of the unknown solution Q is, 0.265

Explanation :

Using Beer-Lambert's law :

$A=\epsilon * C* l$

where,

A = absorbance of solution

C = concentration of solution

l = path length

$\epsilon$ = molar absorptivity coefficient

From the Beer's Law plot between absorbance and concentration we concldue that the slope is equal to $\epsilon * l$ and path length is 1 cm.

As we are given that:

Slope = 0.543 M⁻¹

and,

Slope = $\epsilon * l$

$\epsilon * l=0.543M^(-1)$

$\epsilon * 1cm=0.543M^(-1)$

$\epsilon=0.543M^(-1)cm^(-1)$

Now we have to determine the concentration (in molarity) of the unknown solution Q.

Using Beer-Lambert's law :

$A=\epsilon * C* l$

$0.144=0.543M^(-1)cm^(-1)* C* 1cm$

$C=0.265M$

Therefore, the concentration (in molarity) of the unknown solution Q is, 0.265

Did Pb2+ react with KI? Yes or No? State the reason of your answer.

Answers

Yes, Pb2+ react with KI.

Pb2+ is lead (II) ion
KI is a compound. It is a combination of potassium (K) and iodine (I). It is called potassium iodide.

Both potassium and iodine are highly reactive elements. Thus, when they are combined with another element like Pb2+, Pb2+ reacts with KI

Answer: Yes, lead ion will react with potassium iodide.

Explanation: When lead ion reacts with KI, a bright yellow colored precipitate is formed.

The reaction of these two follows:

$Pb^(2+)(aq.)+2KI(aq.)\rightarrow PbI_2(s)+2K^+(aq.)$

Hence, $Pb^(2+)$ ion reacts with KI to yield $PbI_2$

This test is the confirmatory test for lead ion which is present in Group I.

Where are the heavy metals located on the periodic table

Answers

Heavy metals are located on the lower part of the periodic table, specifically in the d-block and f-block elements.

In the periodic table, heavy metalsare found in the d-block and f-block, at the bottom. Elements in the d-block, or transition metals, span groups 3 through 12 in the periodic table. Metals like iron, copper, and zinc are included in this category.

The f-block elements, which comprise the lanthanides and actinides, may be found at the very end of the periodic table and are referred to as the inner transition metals. Due to their large atomic weights and high densities, elements like uranium and plutonium are classified as heavy metals.

Learn more about heavy metals, here:

brainly.com/question/32152240

#SPJ6

they are located on the right side of the table heavy metals include lead, mercury, cadmium, sometimes chromium

check the pic for more detail

[AZ][B]^4=K[AB2]^2
As this reaction takes place at higher temperatures, it is observed that the equilibrium shifts toward the products. The
reaction is ?
1) exothermic
2)endothermic

Answers

Answer:

I think D. shift the equilibrium reaction to favor the endothermic process

Explanation:

When a nonmetal bonds with a nonmetal, they form a(n) ionic compound

covalent compound

element

atom

Answers

Covalent bonds would be formed when a non-metal bonds with another non-metal

Final answer:

When a nonmetal bonds with another nonmetal, they typically form a covalent compound. This is because nonmetals have similar tendencies to attract electrons and, hence, they form a mutual sharing of electrons which constitutes a covalent bond.

Explanation:

When a nonmetal bonds with another nonmetal, they form a covalent compound. Covalent compounds are formed when two atoms share electrons, rather than transferring them as in ionic bonding. Nonmetals typically have similar electronegativities, meaning they both have similar tendencies to attract electrons. As a result, neither atom completely transfers its electron(s) to the other, they rather settle on a compromise and decide to share the electron(s). This sharing of electrons is the basis of a covalent bond. An example is the covalent bond of two oxygen atoms to form an O2 molecule.