help I can't find the answers ​

Answer:

21.7 kj

Explanation:

The heat required to change the phase of a matter is calculated by using the latent heat formula, Q=ML, where M is the mass released or absorbed during the phase change and L is the latent heat of a material. Since ice is melted into water, this process is technically called the heat of endorthermic phase change that is Q_in=ml

The latent heat of water is 334 kg/kj. In order to melt 65. 0g of ice Q=0.065 x 334kj/kg =21.71 of heat required

Answer and Explanation:

Oceans are like giant swimming pools for marine life. Not really for people though. One difference that most swimming pools tend to have chlorine in them. If not, then they have salt water similar to an ocean. The chemical substance chlorine is not good for marine life at all, and isn't really good for people either.

But instead of chlorine, oceans have types of bacteria that aren't good for people either, especially if ingested in high amounts. So, if you've ever accidentally swallowed sea water and felt a little sick to your stomach, this could be why. They are similar though because they both have water and a form of bacteria.

They are not connected in a way of cycling water with each-other, but they do have similarities and differences as I had mentioned before.

Let me know if you have any more questions about this topic, I hope that this helps.

I don't do physics in school guyz so please

Answer:

Covalent

Explanation:

Explanation:

Atoms are not really picky. They actually bond with other atoms to form an octect state. Let's take an example of an atom with, say, 2 valence electrons. This atom will have to bond with an atom which has 6 valence electrons to reach its octect state (6 + 2 = 8 =》 octect state is from L shell and above).

Hope it helps ⚜

Answer:

I can help you with that... I cannot screenshot your question... what you can do is send me that PDF

Answer:

In the case of a New Moon, the Moon is between Earth and the Sun, so the side of the Moon facing the Sun isn't facing us. We can't see any portion of the lit-up Moon during this phase. (When the Sun and Moon exactly line up, as viewed from Earth, we get a special experience known as a solar eclipse

Explanation:

good luck hope this helps

Answer:

Covalent

Explanation:

hi, How are you?

NO2 is already polar, due to the fact that nitrogen shares a maximum of 3 electrons. Thus N makes two covalent bonds with one oxygen, one covalent and one dative with the other. And there's still a free electron left that causes the molecule to bend, forming an angle, and so the NO2 molecule is polar with an angle other than 180.

This problem is providing an equilirium reaction with the initial concentration of COCl2 and the equilibrium concentration of Cl2 for us to calculate the equilibrium constant. At the end, the result is 0.00166.

In chemistry, not all chemical reactions turn out into completion yet reach a point of constant concentrations (conversion) called equilibrium. In such a way, since this problem is based on this phenomenom, we can start by setting up the equilibrium expression:

[tex]Kc=\frac{[CO][Cl_2]}{[COCl_2]}[/tex]

Where each concentration is at equilibrium. Now, since all these species are in 1:1 mole ratio, we can see that the cocentration that changed up to equilibrium is 3.38×10⁻² M (Cl2's concentration), and thus we can calculate Kc with:

[tex]Kc=\frac{(3.38x10^{-2}M)(3.38x10^{-2}M)}{(0.723M-3.38x10^{-2}M)}\\\\Kc=0.00166[/tex]

Learn more about chemical equilibrium: https://brainly.com/question/26453983

Answer:

357.14 cm^3

Explanation:

From Law of Proportions,

P1V1/T1 = P2V2/T2

750 x 200 / 15 = 700 x V2 / 50

50 x 200 = 14 x V2

V2 = 10000 / 14

     = 5000 / 14

     = 357.14

The time taken for the water fountain to dispense 842.75 mL of water is 20.625 seconds

Time can be defined as the measure of past, present or future events.

To calculate the time taken to dispense 842.75 mL of water, we use the formula below.

Formula:

Where:

Make t the subject of the equation.

From the question,

Given:

Substitute these values into equation 2

Hence, The time taken for the water fountain to dispense 842.75 mL of water, is 20.625 seconds.

Learn more about time here: https://brainly.com/question/13893070

Answer:

Explanation:

Interesting question - especially if you are afflicted by something like Leukemia where it pays to know everything you can about Hemoglobin.

Molecules

1 mole of anything has 6.02 * 10^23 in this case molecules

6.4*10^-3 moles has x number of molecules

Set up the proportion

1/6.4*10^-3   =  6.02 * 10^23 molecule / x          Cross Multiply

x = 6.4*10^-3 * 6.02 * 10^23

x = 3.853*10^21 molecules

Mass Hemoglobin

1 mol of hemoglobin is 64456 grams

6.4*10^-3 moles = x grams                                  Cross multiply

x = 64456 * 6.4*10^-3

x = 412.5 grams of hemoglobin in this woman's body.

If you are American and think in pounds, then this is roughly a pound of hemoglobin.

Considering that you need hemoglobin to carry oxygen around to various organs, it is not an awful lot. That's the miracle of the human body.

Answer:

0.66 L

Explanation:

Here it's given that a sample of Neon occupies a volume of 0.220 L at 0.86 atm . And we need to find out its volume at 29.4 kPa .

If we assume temperature to be constant , then we can apply Boyle's Law , which states that ,

" For a fixed amount of gas at constant temperature , pressure is inversely proportional to the volume . "

Mathematically ,

[tex] P \propto \dfrac{1}{V}[/tex]

Taking k as constant ,

[tex] P =\dfrac{k}{V}[/tex]

And we can say that ,

[tex] P_1 V_1 = P_2V_2[/tex]

Here ,

As we know that ,

[tex] 0.987 atm = 10^5\ Pa [/tex]

So ,

[tex] 29400 Pa = 0.29 \ atm [/tex]

So that ,

[tex] (0.87 atm )(0.220L) = (0.29atm)(V_2)\\[/tex]

[tex] V_2 = \dfrac{0.87 \times 0.220}{0.29} L [/tex]

Simplify ,

[tex] V_2 = 0.66\ L [/tex]

Hence the new Volume of the gas is 0.66 L .

I hope this helps.

Answer:

The molar mass of any substance is the mass in grams of one mole of representative particles of that substance. ... In such a conversion, we use the molar mass of a substance as a conversion factor to convert mole units into mass units (or, conversely, mass units into mole units).

Explanation:

Answer:

conversion factor to convert mole units into mass units

Explanation:

thats the answer, ur welcome!!!!

Answer:

The compound is  "C6H12O6"

Explanation:

we know the relation that

Molecular formula mass = n. (Empirical formula mass)

180.8=n(30.0156)

n= 6

So

Molecular formula = n. (Empirical formula)

Molecular formula= 6 ( CH2O)

Molecular formula = C6H12O6

This problem is providing the number of molecules of nitrogen at STP and asks for the volume they take up. At the end, the result turns out to be 33.6 L according to the following.

In chemistry, gas laws are used to relate pressure, temperature, volume and moles as an indicator of the behavior of gases. Thus, since this problem provides the number of molecules of nitrogen gas at STP, standard pressure and temperature (1atm and 273K), one knows the Avogadro's law must be utilized.

In such a way, this law allows us to know that 1 mole of any substance is related to 6.022x10²³ particles and that 1 mole of the gas occupies 22.4 L at STP. Hence, we can find the volume with the following setup:

[tex]9x10^{23}molecules*\frac{1mol}{6.022x10^{23}molecules} *\frac{22.4L}{1mol} \\\\=33.5L[/tex]

Which can be rounded then to 33.6 L.

Learn more about ideal gases: brainly.com/question/8711877

Answer:

Explanation:

Answer:

[tex]{ \rm{C _{7} H _{8} + 9O _{2} → 7CO _{2} + 4H _{2}O : { \tt{combustion}}}} \\ \\ {\rm{2NaHCO _{3} → Na_{2}CO _{3} + H_{2}O + CO_{2} : { \tt{decomposition}}}} \\ \\ { \rm{CH _{4} → C + 2H _{2} O :{ \tt{decomposition}} }} \\ \\ { \rm{P _{4}O _{10} + 6H _{2}O → 4H _{3} PO _{10} :{ \tt{combination}} }} \\ \\ { \rm{FeSO _{4} → FeO + SO _{3} : { \tt{decomposition}} }} \\ \\ { \rm{CaCO _{3(s)} → CO _{2(g)} + CaO _{(s)} : { \tt{decomposition}}}}[/tex]

Answer:

metallic bond —> sharing of many electrons

covalent bond —> sharing of electrons

ionic bond —> transferring of electrons

Explanation:

im not 100% sure this is right but i hope it still helps!

Answer:

3.75

Explanation:

it's gonna be a decimal number,cus from the formula 5moles produce 4moles of NO

so if 3 moles we're to be produced,it will be 3x5 divide by 4

Answer:

18g

Explanation:

D=m/v

D= Density (g/mL) OR (g/cm^3)

m= mass (g)

v= volume (mL)

Use the Desity formula to find the mass by rearranging the formula so that m = D*v

Simply multiply the density by the volume

1.5*12 =18g

because it is the mass you’re looking for.

Answer: 72.71%

Explanation:

Answer:

93.7

Explanation:

moles = mass ÷ relative atomic mass

mass = 5227g, relative atomic mass of Fe = 55.8

moles = 5227 ÷ 55.8 = 93.7 (1dp)

Sulfur and chlorine are both on the "right side" of the periodic chart. Therefore they are both nonmetals. Nonmetals will react with each other and form covalent bonds.

Answer:

6.11 atm

Explanation:

P1V1=P2V2

(11)(5) = (P2)(9)

55/9 = 6.11 atm = P2

Answer:

"At dynamic equilibrium the reactions continue but the amounts of reactants and products do not change." would be the correct description

Explanation:

Dynamic equilibrium occurs when the rates of change and concentration are the same, so the reaction still takes place, but the amounts of reactants and products stay the same without any change.

According to chemical equilibrium, the statement which correctly describes dynamic equilibrium is that at  dynamic equilibrium, the reactions continue but the amounts of reactants and products do not change.

Chemical equilibrium is defined as the condition which arises during the course of a reversible chemical reaction with no net change in amount of reactants and products.A reversible chemical reaction is the one wherein the products as soon as they are formed react together to produce back the reactants.

At equilibrium, the two opposing reactions which take place take place at equal rates and there is no net change in amount of the substances which are involved in the chemical reaction.At equilibrium, the reaction is considered to be complete . Conditions which are required for equilibrium are given by quantitative formulation.

Factors which affect chemical equilibrium are change in concentration , change in pressure and temperature and presence of catalyst.

Learn more about chemical equilibrium,here:

https://brainly.com/question/8983535

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