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3 years ago

Please help me thank you so much <3

Chemistry

2 answers:

aleksandr82 [10.1K]3 years ago

6 0

A i dolnt reaally know but yeh

mestny [16]3 years ago

5 0

Answer: B.

Explanation:

Onions are made of tons of small cells, while protists are unicellular, meaning that they only have one cell.

I hope this helps! :)

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Explain the three states of matter on the basis of characteristics of particles/ molecules of matter.

Xelga [282]

Answer :

Explanation For The Three States OF Matter On the Basis OF Characteristics Of Particles / Molecules OF Matter.

<h3>Solid: </h3>

In solids the molecules are closely packed . There is a strong force of attraction between the molecules and the space between them is very small (almost negligible). The molecules are , therefore, not free to move . They merely vibrate their mean positions . This makes solids hard and difficult to compress , giving them a fixed shape and size.

<h3>Liquid : </h3>

In the case of liquids , the molecules are not closely packed. They do not attract each other as strongly as the molecules of solids. Thus, the intermolecular spaces are larger and the molecules are able to move about more freely . This makes liquid flow and take the shape of the container into which it is poured. Thus, liquids have a fixed volume but no definite shape of their own .

In the case of gases, the molecules hardly attract each other. They lie far a part from each other and the intermolecular spaces are, therefore, very large. . The intermolecular force of attraction is so weak that the molecules have great freedom of movement . As a result , gases have neither a fixed shapenor a fixed volume . They completely full up spacw available to them. They can be easily compressed as well, thus decreasing the gaps between their molecules .

Explanation :

<h3>Hope it works out !</h3>

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3 years ago

Aces true or false, negatively charged particles in an atom are called electrons?

ZanzabumX [31]

True... atoms contain what are called electrons and protons. the protons being possitively charged and the elctrons being negatively charged

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4 years ago

Rachel burns a 53 gram cracker under a soda can filled with 81.6 grams of water. She took the temperature of the water before sh

Anna11 [10]

Answer

Q=4479.8 cal

Procedure

To solve the problem you will need to use the specific heat formula

$Q=mc\Delta T$

Where;

Q=heat energy

m=mass

c=specific heat capacity

ΔT=change in temperature

Assuming that the heat released from the cracker of unknown material is equal to the heat absorbed by the water, then we can use the c and m for water in our calculations.

$c_{water}=4.186\frac{J}{g\degree C}$

Substituting the values in our equation we have

$Q=mc\Delta T=81.6\text{ }g(4.186\frac{J}{g\degree C})(68.1-13.2)\degree C=18752.61\text{ }J$

Finally, transform the J to cal

$18752.61\text{ }J\frac{1\text{ }cal}{4.186\text{ }J}=4479.8\text{ cal}$

8 0

1 year ago

A sample of oxygen gas has a volume of 5.60 l at 27Â°c and 800.0 torr. how many oxygen molecules does it contain?

ratelena [41]

1.44x10^23 molecules of oxygen gas The ideal gas law is PV = nRT where P = pressure (800.0 Torr) V = volume (5.60 L) n = number of moles R = Ideal gas constant (62.363577 L*Torr/(K*mol) ) T = absolute temperature (27C + 273.15 = 300.15 K) Let's solve for n, the substitute the known values and solve. PV = nRT PV/RT = n (800.0 Torr*5.60 L)/(62.363577 L*Torr/(K*mol)*300.15 K) = n (4480 L*Torr)/(18718.42764 L*Torr/mol) = n 0.239336342 mol = n So we have 0.239336342 moles of oxygen molecules. To get the number of atoms, we need to multiply by avogadro's number, so: 0.239336342 * 6.0221409x10^23 = 1.44x10^23

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Oh wow , what grade are you in ukliblo ?

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