How much heat do you need to raise the temperature of 150 g of gasoline from −30 °C to −15 °C ?

A.) 4.68 kJ
B.) 5.00 kJ
C.) 6.66 kJ
D.) 9.40 kJ

Answer:

The answer is Venus. So B

Answer:

The molecules having positively charged end and negatively charged end due to the difference in the charges of atoms present in the molecules are polar molecules. The molecules that do not have such separation of electric charges are nonpolar. Most of the polar molecules have an asymmetric or uneven distribution of electrons.

Explanation:

hope this helps

have an awesome day -TJ

may I please have brainliest

Answer:

The polarity of the individual bonds in the molecule

The arrangement of bonds around the molecule

Explanation:

Hope this helps

Answer:

5.66667

Explanation: because you have to take 12 and see how many times it fits into 68. Hope this helps! :^)

Answer:

E = hf

E = hc/lamda

where E-energy,

h-planck's constant (6.62 x 10^-34 Js)

f- frequency ( f = c/lamda)

c-velocity of light ( 3 x 10^8 m/s)

lamda- wavelength

you can this formula to solve all the 4 questions.

Answer:

You can tell when a chemical change has happened when the chemical changes in appearance such as color or physical state.

Explanation:

If a change happens it can change in any way shape or form.

The mass of oxygen required to completely react with C₃H₈ is 0.091 grams.

Moles of any substance will be calculated as:

n = W/M, where

W = given mass

M = molar mass

Given chemical reaction is:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Moles of 0.025g of C₃H₈ will be calculated as:

n = 0.025g / 44.1 g/mol = 0.00056 moles

From the stoichiometry of the reaction it is clear that:

1 mole of C₃H₈ = react with 5 moles of O₂

0.00056 mole of C₃H₈ = react with 5×0.00056=0.0028 moles of O₂

Now we calculate the mass of oxygen by using the above moles and molar mass as:

W = (0.0028mol)(32.00 g/mol) = 0.0896g = 0.090g

Which is approx to the given valoe 0.091g.

Hence correct option is (d).

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Answer:

29.596 g/cm^3

Explanation:

mass=density*volume=9.8*3.02=29.596

Answer: 27.43 kPa

Explanation:

Use PV / T = PV / T →

P(.776) / (298) = (32.6)(.664) / (303) →

Cross Multiply to get: 235.128P = 6450.6272 →

Divide to get: P = 27.43 kPa :)

The more matter you place into a defined

volume, the denser it becomes. Therefore they have the same density because (Mass is the amount of matter in a object)

The more the number of particles the better the frost protection hence, salt offers a better frost protection than sugar.

The term frost protection has to do with protection agianst the accumulation of frost or snow.

We have to note that this property depends on the ability of the substance to decrease the melting point of ice. The more the number of particles the better the frost protection hence, salt offers a better frost protection than sugar.

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#SP1

Answer:

Water has a density of 1 g/m so it could be sometimes true

Explanation:

Answer:True

Explanation: If you look it up it says the anwser. Can you give me a thank and a five.

Also very important if you put your question in the search bar and put quizlet after then you can find answer for you test quizes and more.

I hope this helps you and have a great day bye.

Answer:

Oxygen causes oxidation. You can think about oxidation like rust on a car. Rust forms when the iron or steel in your car reacts with the oxygen in the air to form iron oxide. The resulting red substance can be quite brittle, so much so that you could literally poke a hole in it with your finger.

Answer:

Oxidation, which is the chemical reaction of oxygen with other substances, is very effective at weathering minerals that have iron in their chemical formulas. In other words, oxidation is what causes different types of rust.

Explanation:

Hope this helps! Good luck! <3

Answer:

Carbon, Hydrogen, Oxygen, Nitrogen, and Sulfur.

(Those are all the ones I know)

Example of 3 substances that have bonded atoms are :

Substances that have chemically bonded atoms are generally known as molecules, while a compound is a substance made up by the chemical bonding of different atoms from different elements. there are some readily available substance in nature that have bonded atoms like ; water and Table salt.

Hence we can conclude that three ( 3 ) examples of substances that have bonded atoms are ; Water, Calcium Oxide and Table salt.

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The answer is 2.53e-5, I unfortunately don't know how you would really show the work other than showing the division.

Answer:

a. 9.00 x 1013 J

Explanation:

Trust me

6.5 g/cm³

Hi there !

density formula

d = m/V

1ml = 1cm³

= 26g/4cm³

= 6.5 g/cm³

Good luck !

The concentration, in grams per liter, of a solution prepared by dissolving 0.00040 mol HCl in 2.2L H₂O is 0.0066 g/L.

Mass of any substance will be calculated by using their moles as:
n = W/M, where

W = required mass

M = molar mass

GIven moles of HCl = 0.00040 mole

Mass of 0.00040 mole of HCl will be calculated as:

W = (0.00040mol)(36.45g/mol) = 0.01458g

Given volume of Water = 2.2 L

Now the concentration in molality (g/L) will be calculated as:

concentration = (0.01458g) / (2.2L) = 0.0066 g/L.

Hence required concentration is 0.0066 g/L.

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Answer: first one is 0.0066 and second one is 6.6

Explanation:

I got it right

The new molarity of the solution is 0.5M.

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

C1V1 = C2V2

Where;

According to this question, a chemist dilutes 2.0 L of a 1.5 M solution with water until the final volume is 6.0 L.

1.5 × 2 = 6 × C2

3 = 6C2

C2 = 3/6 = 0.5M

Therefore, the new molarity of the solution is 0.5M.

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Answer:

PFAS molecules are made up of a chain of linked carbon and fluorine atoms. Because the carbon-fluorine bond is one of the strongest, these chemicals do not degrade in the environment.

Answer

7.4 moles

Explanation

After you cancel out the units of measurement to check the order of the conversion, multiply 3.7 with 4 and then divide the answer by 2 . You get 7.4 moles of Al .

Answer:

2+1=1+4

Explanation:

2h2so4+1pb(oh)4=1pb(so)4+4h2o

Explanation:

In order to find whether it will sink or float in water we must first find the density of the object

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 18 g

volume = 9 cm³

So we have

[tex]density = \frac{18}{9} \\ [/tex]

We have the density as 2.0 g/cm³

The object will sink in water since it's density is greater than that of water which is 1.0 g/cm³

Hope this helps you

Explanation:

To round to a significant figure:

Answer:look at the first non-zero digit if rounding to one significant figure.

look at the digit after the first non-zero digit if rounding to two significant figures.

draw a vertical line after the place value digit that is required.

look at the next digit.

Explanation: Google ;DDDD

Answer:

There aren't any options given. Maybe you should repost with options or just edit them in.

Answer:

physical property

Explanation:

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\[/tex]

From the question

mass = 2.49 g

density = 6.26 g mL-1

So we have

[tex]volume = \frac{2.49}{6.26} \\ = 0.397763578...[/tex]

We have the final answer as

Hope this helps you

Dilution of the solution can be calculated by the formula of the molarity and volume. The initial volume of 2.50 M solution was 30 mL.

Molar concentration or the dilution factor is in an inverse relationship and with an increase in the dilution, the molarity of the solution decreases.

Given,

Initial molarity = 2.50 M

initial volume = ?

Final molarity = 0.750 M

Final volume = 100.0 ml

Substituting values in the formula:

[tex]\begin{aligned}\rm V_{1} &= \rm \dfrac{M_{2}V_{2}}{M_{1}}\\\\&= \dfrac{0.750 \times 100}{2.50}\\\\&= 30 \;\rm mL\end{aligned}[/tex]

Therefore, 30 mL was the initial volume of the solution before it was diluted.

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