A 1 kg block of iron sits outside in the direct sun from 8am to 10am. At 8am the temperature of the block was 20.0°C and at 10am the temperature of the block was 27.5°C.
How much heat did the block of Iron absorb from the sun?
use q=mcΔT

Answer:

The answer is c.........

The heat flows from inside to the outside direction because of lowering of temperature inside the thermos.

When a thermometer is suspended in an insulated thermos that contain a block of ice, the temperature recorded on the thermometer drops, the direction of heat flow is from inside to the outside the thermos. This is because of the insulating material in which the ice is kept and the lowering of the temperature.

So we can conclude that the heat flows from inside to the outside direction because of lowering of temperature inside the thermos.

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Answer:

1. lava

2. caldera

3. true

4. true

5. before

Answer:

A. Seal them in a glass container in an atmosphere of argon (Ar) gas.

Because Argon is an inert/noble gas which do not react with other elements/radicals. Thus, best way to make two radicals/substance only react is to seal them in glass container consisting atmosphere of Argon (Ar)..

Note: I also dont know if it's correct answer.. Since I am just giving my logic.. I hope it will help you

- Regards Rishab...

Answer: C. Seal them in a glass container in an atmosphere of argon (Ar) gas.

Explanation: Founders Educere answer ;)

Answer:

This isn't chemistry but the answer is Force = mass x acceleration

Answer:

Your answer is Answer thank me later :) <3

Explanation:

Answer:

propyne

Explanation:

An online version is the availability of the application on the web and the internet. The online version of the logo designer is advantageous as it provides more customization choices.

A logo design is a method to create logos that represent the brand of the business corporation or any other organization, it represents the company and brand.

Online software for logo designing provides more choices for customization as more fonts, styles, graphics, colors, and effects are present in online software.

The use of online software can be disadvantageous as it can be copied. The same tool and online data can be used to create the same logo and can be harmful to the company.

Therefore, using online software for logo designing can be both advantageous and disadvantageous.

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Answer:

Explanation:first one

The solubility (in mol/L) of silver chromate in 1.20 M in potassium chromate,  silver nitrate and in pure water is

This is further explained below

Generally,The Chemical reaction is

Ag2CrO4 <----> 2 Ag+ + CrO42-

Ksp = [Ag+]^2[CrO42-]

1.12×10−12 = [Ag+]^2[CrO42-]

Hence

1.12×10−12.=(2X)^2*(1.2)

X = 5.0*10^-7 M

b)

1.12×10−12=(1.2)^2*(X)

1.12×10−12= 1.44 * 1(X)^1

X'' = 8.333*10^-13 M

In conclusion

1.12×10−12=(2X)^2*(s)

1.12×10−12= 4(X)^3

X'''= 6.694*10^-5 M

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Answer:

C. Technologies reduce the amount of carbon dioxide produced by

factories.

Explanation:

simply the answer is C. trust me, im very smart

Answer:

no.3 is your correct answer

Answer:

0.93 M

Explanation:

Molarity = [tex]\frac{Moles}{Volume}[/tex]

4.0M = [tex]\frac{x}{0.007 L}[/tex]

4.0 M x 0.007 L = Moles = 0.028

Molarity = [tex]\frac{Moles}{Volume}[/tex]

Molarity = [tex]\frac{0.028 moles}{0.03 L}[/tex]

= 0.93 M

Answer:

B + C ARE INCORRECT FROM THE ABOVE GIVEN CONVERSIONS.

Answer: can hydrogen produce as much energy as burning fossil fuels?

Explanation:

Answer:The larva might form a cocoon or a chrysalis.

Explanation:

Answer:Charcoal will burn. You may also be able to distinguish it by smell, since it's rarely purged of all its “burnt wood” residue. Copper oxide will dissolve in a strong acid, such as hydrochloric or sulphuric and form a blue solution

Explanation:

Answer:

This means that one mole of water molecules has a mass of 18.015g.

42.3g * 1 mole H2O/18.015g

= 2.3480 moles H2O

We are using the avogadros number to find the number of molecules of water

2.3480 H2O * 6.022*10^ 23moles/ 1mole of H2O

That's 2.3480 multiplied by 6.022*10^23 divided by 1 mole of H2O

Number of molecules = 1.4140 *10^24 molecules

Here are the balanced equations

Done!

Answer:

the interest applied on the end of day balance.

Explanation:

Do you mean scientific theory? If so, then scientific theories and laws are principles which can be used to better understand the world and space around us.

Answer:

a) The molecular formula of oleic acid is: [tex]C_{18}H_{34}O_{2}[/tex]

b) There are 5.74 x 10^21 molecules of oleic acid in a 3.00 mL sample.

Explanation:

a)

First, let's determine the empirical formula of oleic acid from the percentage composition provided by the question:

- Assuming a 100g sample of oleic acid, the correspondent mass of C, H and O would be:

mass of C = 76.54g

mass of H = 12.13g

mass of O = 11.33g

- We must determine the number of moles contained in each of the masses determined above. For that, let's use the atomic masses of C (12.01 u), H (1.007 u) and O (15.99 u) and the following equation:

[tex]number of moles = \frac{mass of sample}{molar mass}[/tex]

number of moles of C = 76.54g / 12.01 g/mol = 6.373 mol C

number of moles of H = 12.13g / 1.007 g/mol = 12.04 mol H

number of moles of O = 11.33g / 15.99 g/mol = 0.7086 mol O

- Next, we'll try to find whole-number ratios by dividing each number of moles obtained by the smallest value obtained (0.7086):

C = 6.373 / 0.7086 = 8.994 ≅ 9

H = 12.04 / 0.7086 = 16.99 ≅ 17

O = 0.7086 / 0.7086 = 1.000

- Now, we can write the empirical formula of oleic acid as: [tex]C_{9}H_{17}O[/tex]

Now that we have the empirical formula for oleic acid (C9H17O), let's check its molar mass and compare it to the experimental value provided by the question (282 g/mol):

molar mass (C9H17O) = 9 * 12.01 + 17 * 1.007 + 1 * 15.99 = 141.9 g/mol

Note that the molar mass obtained from the empirical formula (141.9 g/mol) and the experimental molar mass (282 g/mol) are different, thus we need to find an integer multiple to determine the molecular formula (keep in mind that molecular formulas always present kind and number of atoms of each element present in the molecular compound, while the empirical formula presents the smallest coefficients for each atom).

Molecular formula = n × Empirical formula

This integer multiple, n, can  be obtained by dividing the molar mass,  MM , of the compound by the empirical formula mass,  EFM  (the molar mass represented by the empirical formula):

n = MM / EFM

n = 282 / 141.9

n = 1.987 ≅ 2

Since the integer multiple is 2, we can multiply all coefficients in the empirical formula by 2 to find the molecular formula of oleic acid:

C9 H17 O x 2 = C18 H34 O2

Therefore, the molecular formula of oleic acid is: [tex]C_{18}H_{34}O_{2}[/tex]

b)

We need to calculate the amount of molecules of oleic acid in a 3.00mL sample, considering the density as 0.895 g/mL.

From the density provided, we can calculate the mass, in grams, of oleic acid contained in 3.00 mL of this compound:

1 mL ----------------------- 0.895 g oleic acid

3.00 mL ----------------- x

Solving for x, we have that there are 2.69 g of oleic acid in a 3.00 mL sample.

Next, considering the molar mass of oleic acid (282 g/mol), we can calculate the number of moles contained in 2.685g of the acid:

282 g -------------------- 1 mol oleic acid

2.69 g ----------------- y

Solving for y, we have that there are 0.00953 moles of oleic acid in a 3.00 mL sample.

Now, using the Avogadro's number (6.022 x 10^23 particles/mol), we can calculate the amount of molecules of oleic acid in the sample:

1 mol oleic acid ------------------------------- 6.022 x 10^23 molecules oleic acid

0.00953 mol oleic acid ------------------- z

Solving for z, we have that there are 5.74 x 10^21 molecules of oleic acid in a 3.00 mL sample.

From the balanced equation of the reaction, the coefficients of the reactants and products are 1:2:1.

A balanced equation of a chemical reaction is an equation which balances the atoms of each element on the reactants as well as the products side of a chemical reaction.

The balanced equation of the reaction that occurs when magnesium bromide is heated is shown below:

[tex]MgBr_2 \rightarrow Br_2+Mg [/tex]

Therefore, the coefficients of the reactants and products are 1:2:1.

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Answer:

MAthhh

Explanation:

Give me a brainly

Answer:

My favorite subject in school is P.E or Language arts

Explanation:

The molarity of a new solution that has a volume of 25.0 mL of a 2.00 M HCl solution and diluted to 2.00 L is 0.025M.

The molarity of a solution can be calculated using the following formula:

C1V1 = C2V2

Where;

2 × 25 = 2000 × C2

50 = 2000C2

C2 = 50 ÷ 2000

C2 = 0.025M

Therefore, the molarity of a new solution that has a volume of 25.0 mL of a 2.00 M HCl solution and diluted to 2.00 L is 0.025M.

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Answer:

About 4.63.

Explanation:

The reaction between ethanoic acid (CH₃COOH) and sodium hydroxide (NaOH) can be described by the following net ionic equation:

[tex]\displaystyle \text{CH$_3$COOH}_\text{(aq)} + \text{OH}^-_\text{(aq)}\longrightarrow \text{CH$_3$COO}^-_\text{(aq)} + \text{H$_2$O}_\text{($\ell$)}[/tex]

40.0 mL of 0.040 M NaOH contains:
[tex]\displaystyle 40.0\text{ mL} \cdot \frac{0.040\text{ mol NaOH}}{1000\text{ mL}} = 0.0016\text{ mol NaOH}[/tex]

Because NaOH is a strong base, it dissociates completely. Hence, the amount of OH⁻ present is 0.0016 mol. Na⁺ acts as a spectator ion.

50.0 mL of 0.075 M CH₃COOH contains:
[tex]\displaystyle 50.0\text{ mL} \cdot \frac{0.075\text{ mol CH$_3$COOH}}{1000\text{ mL}} = 0.0038\text{ mol CH$_3$COOH}[/tex]

OH⁻ is the limiting reagent of the reaction. Therefore, as the reaction proceeds to completion:

Note that all species present are in a one-to-one ratio.

To find pH, we can use the Henderson-Hasselbalch equation:

[tex]\displaystyle \text{pH} = \text{p}K_a + \log\frac{[\text{Base}]}{[\text{Acid}]}[/tex]

The total volume of the solution is 40.0 mL + 50.0 mL = 90.0 mL.

Hence, find [CH₃COOH]:

[tex]\displaystyle \left[\text{CH$_3$COOH}\right] = \frac{0.0022\text{ mol}}{90.0\text{ mL}} \cdot \frac{1000\text{ mL}}{1\text{ L}} = 0.024\text{ L}[/tex]

Find [CH₃COO⁻]:
[tex]\displaystyle \left[\text{CH$_3$COO}^-\right] = \frac{0.0016\text{ mol}}{90.0\text{ mL}}\cdot \frac{1000\text{ mL}}{1\text{ L}} = 0.018\text{ M}[/tex]

Therefore, the pH of the resulting solution is:
[tex]\displaystyle \begin{aligned}\text{pH} & = \text{p}K_a + \log\frac{[\text{Base}]}{[\text{Acid}]} \\ \\ & = (4.75) + \log \frac{(0.018)}{(0.024)} \\ \\ & = 4.75 + (-0.12) \\ \\ & = 4.63\end{aligned}[/tex]

In conclusion, the pH of the resulting solution is about 4.63.

Answer:

310.15 Kelvin. 98.6 Farenheit

Explanation:

To calcuate the celsius to Kelvin you add 273.15 to the celsius. To calculate the celsius to farenheit you do (°C × 9/5) + 32 = °F. For the example, (37°C × 9/5) + 32 = 98.6°F.

Answer:

Something like table salt (NaCl) is a compound because it is made from more than one kind of element (sodium and chlorine), but it is not a molecule because the bond that holds NaCl together is an ionic bond. If you like, you can say that sodium chloride is an ionic compound.

Explanation:

Answer: it is coastline.

Explanation: This anwser would only makw sense because of the low elevation and the flat land.

The landform shared by Florida and the eastern border of South Carolina is the coastline. Option C is the correct answer.

Both states are located along the Atlantic Ocean and have a similar geographical feature characterized by flat land and low elevation along their eastern borders. Option C is the correct answer.

The coastline refers to the area where the land meets the sea. It is typically marked by sandy beaches, coastal marshes, and barrier islands. In the case of Florida and the eastern border of South Carolina, this coastline is known for its relatively flat terrain and low elevation, which makes it susceptible to flooding and storm surge during hurricanes. The coastline plays a significant role in the economies and ecosystems of both states. It attracts tourism and provides opportunities for recreational activities such as beachgoing, fishing, and boating. It is also a vital habitat for various marine and coastal species, including birds, turtles, and marine mammals.

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The complete question is, "Florida and the eastern border of South Carolina share a regional landform characterized by flat land and low elevation. Identify the landform shared by both states.

a. Karst

b. Keys

c. Coastline

d. Plateau"

Answer:

the size depends on where is moves across the periodic table.

Answer:

All of the above :D

Explanation:

When rain falls, if it doesn't get absorbed by the dirt, it will go into streams, rivers, and ponds. That is actually how flooding is caused!!! :D

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