Which element has the least density at STP?

Answer:

mixture

Explanation:

Answer:

Mixture

Explanation:

Answer:

25

Explantion:

atomic no. =  no. of eletron

Answer:

2.19moles

Explanation:

mole = mass ÷ molar mass

Molar Mass of the compound, C135H96O9NS =

12(135) + 1(96) + 16(9) + 14 + 32

= 1620 + 96 + 144 + 14 + 32

= 1906g/mol

Next, we calculate the mass percent of Oxygen in the compound

O9 = 16(9) = 144g/mol

144/1906 × 100

= 0.0755 × 100

= 7.55%

This means that there are 0.0755g of Oxygen in 1 mole of the coal compound.

Hence, in 29.1 moles of coal, there would be 29.1 × 0.0755

= 2.19moles of Oxygen

Answer:

what's the question here then ?????

Explanation:

nepal ????

Volume of Ammonia(NH₃) = 22.4 L

Given

Reaction

3CuO+2NH₃⇒ 3Cu + 3H₂O+ N₂

In the problem, the CuO coefficient should be 3 not 2

M CuO = 80

mass CuO = 120 g

Required

The volume of NH₃

Solution

mol CuO :

[tex]\tt mol=\dfrac{mass}{M}\\\\mol=\frac{120}{80}\\\\mol=1.5[/tex]

From the equation, mol ratio CuO : NH₃ = 3 : 2, so mol NH₃=

[tex]\tt \dfrac{2}{3}\times 1.5=1~mol[/tex]

Assume at STP(0 °C, 1 atm) ⇒1 mol = 22.4 L, then volume of NH₃=22.4 L

Answer:

Explanation:

I hope this helps! :)))

Answer:

Fungi, bacteria, ferns,

Explanation:

bacteria Fungi Ferns are important. decomposers,

I hope it helps you.

There are basically four different categories of decomposers: fungi, insects, earthworms, and bacteria. Fungi, ferns and bacteria are common decomposers.

Decomposers are organisms that disintegrate rotting or dead species; they carry out decomposition, a process only some kingdoms, like fungi, are capable of.

The primary decomposers in nature are fungi, which destroy organic material that would otherwise not be recycled.

Scavengers and decomposers are the two different categories of decomposers. Animals called scavengers hunt down dead plants or animals and consume them. They cut them into small pieces when they eat them.

Each contributes to the food recycling process differently. To transform dead plants or animals into simple substances, fungi release compounds. Some of these elements are absorbed by them for growth, while others go into the soil.

Thus, Fungi, ferns and bacteria are common decomposers.

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Answer:

2Al + 3Na2SO4 -----> Al2(SO4)3 + 6 Na

Explanation:

Product should be Al2(SO4)3

Because Al contains +3 charge

And SO4 contains -2 charge

To balance this postive and negative charge we multiple +3 with 2 and -2 with 3

Answer:  Edgy, 2020

Explanation:    <3

Answer:

refer to picture below :)

Explanation:

Answer:it's either the first or second one

Explanation:

the layers of the earth

Answer:

1)

Hg

80 protons, 80 electrons, 121 neutrons

2)

Mo

42 protons, 42 electrons, 54 neutrons

3)

Symbol is Cu, Mass is 64, 29 Protons

4)

C

Atomic number is 6, 6 protons, 6 electrons, 6 neutrons

5)

Symbol is P, 15 protons, 15 electrons, 16 neutrons

6)

Pb

Atomic number is 82, 82 electrons, 125 neutrons

7)

Na

Mass is 23, 11 protons, 11 electrons.

Hopefully this helps!

Answer: B. When two clear, colorless liquids are mixed together, a white solid forms.

D. A white piece of paper turns black and gives off a smell when burned.​

Explanation:

A. A white powder mixed with a clear, colorless liquid makes a solution that is also a clear, colorless liquid. B. When two clear, colorless liquids are mixed together, a white solid forms. O C. A shiny metal bar glows red and expands when heated. D. A white piece of paper turns black and gives off a smell when burned.​

When two clear, colorless liquids are mixed together, a white solid forms. A white piece of paper turns black and gives off a smell when burned.​ These two options are examples of chemical changes.

Chemical change, or, alternatively, chemical breakdown into two or more separate molecules, occurs when one material reacts with another to create a new substance. These processes are referred to as chemical reactions, and they are typically irreversible barring additional chemical reactions.

A chemical transformation is one in which one or more new compounds are created. Chemical reactions are another name for a chemical transformation. Examples include burning any stuff and iron rusting.

Chemical synthesis, or, alternatively, chemical breakdown into two or more separate molecules, occurs when one material reacts with another to create a new substance. These processes are referred to as chemical reactions, and they are typically irreversible barring additional chemical reactions.

Thus, option B and D are correct.

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hope this can help you

you can search on google some stuff like your question

Answer:

∆T = imK

∆T = Change in boiling point (B.P.)

i = van't Hoff factor = 2 for NaCl (Na+ and Cl2_

m = molality = 0.321 m

k = boiling point constant for water = 0.512 deg/m

∆T = (2)(0.321)(0.512) = 0.329 degrees

Since the normal B.P. for water is 100ºC, the new boiling point of this solution is 100 + 0.329 = 100.329ºC

So Our Answer is 100.329ºC

The boiling point of the 0.321 m NaCl solution has been 100.329 degrees Celsius.

The boiling point has been defined at the temperature at which the liquid started to convert to gas.

The van't Hoff factor has been a value of the number of ions formed by the dissociation of 1 formula unit of a compound.

The change in the boiling point of the sample, ([tex]\Delta T[/tex]) has been given by:

[tex]\Delta T=imK[/tex]

Where, the van't Hoff factor for NaCl, i =-2

The molality of the sample, m =0.321 m

The boiling point constant of water, [tex]K=0.512\;^\circ m^-^1[/tex]

Substituting the values for change in temperature ([tex]\Delta T[/tex]):

[tex]\Delta T=2\;\times\;0.321\;\times\;0.512\;^\circ C\\\Delta T=0.329\;^\circ C[/tex]

The change in the temperature of the water on the addition of NaCl has been 0.329 degrees Celsius.

The initial temperature of the water has been 100 degrees Celsius. The new temperature (T) of the NaCl solution has been:

[tex]T=100\;+\;0.329\;^\circ \text C\\T=100.329\;^\circ \text C\\[/tex]

The new boiling point of the NaCl solution has been 100.329 degrees Celsius.

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Answer:

A gaping hole in the ozone layer over Antarctica was discovered in the mid 1980s. The international community agreed the Montreal Protocol in 1987, which banned most of the offending chemicals.

Answer:

9.3

Explanation:

The first thing to do to solving this problem is putting mass over volume, 96.5g / 5cm^3. When you divide, you should get 1. Hope I helped.

Answer:

Half life = 7.2 seconds

Explanation:

[tex]from \: decay \: equation \\ 2.303 log( \frac{n.}{nt} ) = kt \\ 2.303 log( \frac{50}{12.5} ) = k \times 14.4 \\ k = \frac{2.303 log( \frac{50}{12.5} )}{14.4} \\ k = 0.096288 {s}^{ - 1} \\ since \: half \: life = \frac{ ln(2) }{k} \\ half \: life = \frac{ ln(2) }{0.096288} \\ half \: life = 7.2 \: seconds[/tex]

Answer:

True

Explanation:

Sublimation is the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage.

For those of us interested in the water cycle, sublimation is most often used to describe the process of snow and ice changing into water vapor in the air without first melting into water which bypasses the conversion to liquid stage and goes straight to the gaseous form.

Answer:D

Explanation:

Answer:

C) adding 16 oz. of water to the marinating liquid

Explanation:

Adding 16 oz. water to the marinating liquid would decrease the concentration of the marinating liquid and slow down the rate of reaction. The other answer choices would increase the rate of reaction.

Answer:

23.33%

Explanation:

from

percent yield=(mass÷total mass )×100%

Answer:

C 6 H 12 O 6 + 6 O 2 --> 6 CO 2 + 6 H 2 O + ATP is the complete balanced chemical formula for cellular respiration.

Answer:

C6H12O6 + 6O2 -> 6CO2 + 6H2O + 38ATP

Explanation:

glucose + oxygen gas -> carbon dioxide + water + ATP

In any chemical process, the matter is neither lost nor gained according to conservation of matter. Therefore, the correct option is option B.

Matter is any material that has weight and occupies space by having volume in classical physics as well as general chemistry. All common items that can be felt are ultimately constituted of atoms, which are composed of colliding subatomic particles, therefore "matter" typically comprises atoms and everything made up of them, as well as any particles that act as if they both rest weight and volume.

It does not, however, contain massless particles like photons or even other energy phenomena and waves like light or heat. There are numerous states of matter (also known as phases). In any chemical process, the matter is neither lost nor gained according to conservation of matter.

Therefore, the correct option is option B.

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Answer:

true

Explanation:

just did it

Answer:

Approximately [tex]0.35\; \rm W[/tex] on average.

Explanation:

There are multiple to find power:

The question did not state the speed at which the arm of the chipmunk moves. However, the question did state the work done ([tex]W = 0.70\; \rm J[/tex]) and the time required ([tex]t = 2\; \rm s[/tex]).

Therefore, the equation [tex]P = W / t[/tex] seem to be more suitable.

[tex]\begin{aligned}&P\\ &= \frac{W}{t} \\ &= \frac{0.70\; \rm J}{2\; \rm s} \approx 0.35\; \rm W\end{aligned}[/tex].

Answer:

it's both cold and hot weather so it could form a tornado

Answer:

A. 7.56

b. 57.12

Explanation:

Hope that's right have a nice day :)