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vovangra [49]
3 years ago
5

Please Help ! Express the quantity 255000m in each unit. a. mm c. cm

Chemistry
1 answer:
ASHA 777 [7]3 years ago
7 0
255000000 mm
25500000 cm
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Twenty gallons of a salt solution consists of 35% salt. It is the result of mixing a 50% solution with a 25% solution. How many
MA_775_DIABLO [31]

Answer:

The volume of the 50% solution used is 0.8 gallons and the volume of 25% solution used is 1.2 gallons.

Explanation:

Let the volume of the 50% solution be be x gallons.

Let the volume of 25% solution be y gallons.

Total volume of the solution after mixing above volumes of the solutions = 2 gallons

x gal + y gal = 2 gal

x + y = 2 ...[1]

Percentage of the final salt solution = 35%

x\times 50\%+y\times 25\%=2 gal\times 35\%

50x+25y=70

10x+5y=14....[2]

On solving [1] and [2] , we get:

x = 0.8 , y = 1.2

So, the volume of the 50% solution used is 0.8 gallons and the volume of 25% solution used is 1.2 gallons.

6 0
3 years ago
What molecule is removed during dehydration synthesis?.
nignag [31]

Answer: <u> two hydrogen atoms and one oxygen</u> atom are removed during dehydration synthesis.

Hope this helps!

4 0
2 years ago
The isotope 90_Sr has a half-life of 28.8 years. What is the activity, measured in atoms/second of a 50 mg sample of "Sr? (10 pt
blsea [12.9K]

Answer:

2.5523\times 10^{11} atoms/secondsis the activity, measured in of a 50 mg sample of 90-Sr.

Explanation:

Half life of the 90-Sr ,t_{1/2}= 28.8 years

Activity coefficient of the 90-Sr = \lambda

\lambda =\frac{0.693}{28.8 years}=0.0240625 year^{-1}

Mass of 90-Sr = 50 mg = 0.050 g

Molecular mass of 90-Sr = 90 g/mol

Moles of 90-Sr =\frac{0.050 g}{90 g/mol}=0.0005555 mol

Number of atom in 0.0005555 moles of 90-Sr:

0.0005555 mol\times 6.022\times 10^{23} mol^{-1}=3.3455\times 10^{20} atoms

\lambda =0.0240625 year^{-1}=\frac{0.0240625}{3.154\times 10^7 s}=7.6292\times 10^{-10} s^{-1}

1 year = 3.154\times 10^7 seconds

Activity measured in atoms per seconds:

= Number of atoms × \lambda

=3.3455\times 10^{20} atoms\times 7.6292\times 10^{-10} s^{-1}

=2.5523\times 10^{11} atoms/s

5 0
3 years ago
Lithosphere: Odd one out . Analyze each part of the rectangle. One of the parts will be different from the others. Shade the par
patriot [66]

The characteristics of the lithosphere found that the frame that is out of sequence is:  

       last frame: Iron

The lithosphere is the upper part of the Earth, it is composed of two parts: the crust and the upper part of the mantle, up to the ionosphere, an area of ​​material in a plastic state.

The lithosphere is the most important part for since all the life processes on the planet occur in it, the depth of the lithosphere is greater in the continental part about 250 km than in the oceanic part 150 km, this is It is because it is floating above the stratosphere.

Let's analyze each part of the picture

1. Rigid rocks in the upper part of the mantle.

The lithosphere is the coldest part of the plant, which is why the rocks have solidified, forming a rigid layer of rocks that floats on the mantle.

2. Crust.

It is another name given the uppermost part of the lithosphere, it is formed by a solid area,

3. Tectonic plates.

The lower part of the lithosphere is on an area in a very hot platic state, therefore there is a thermal gradient between the convection current of the asthenosphere and the thermal conduction of the lithosphere, these thermal gradients create breaks or divisions in the upper layer that we call plate tectonics

4.) solid crust of the Earth

The lithosphere is by definition the solid part of the Earth, which is why it is also called solid crust, but not rigid.

5) Continents.  

They are the highest parts of the lithosphere, they are above the average height of the oceanic that forms the liquid part that fills the lower spaces of the lithosphere, in general it is formed by rocks of granite composition

6) Earthquakes

The plates of the lithosphere can move between it, in some cases these plates are locked (stopped) accumulating energy at some point the rocks that form part and the plates move abruptly this movement is called an earthquake

7) Volcanoes

The lower part of the lithosphere is hotter, in some parts where the upper rock is more fragile, this heat can fragment them, which is why the molten rock called magna has an exit path towards the earth's surface, in general the fragmentation processes and rupture is accompanied by high pressures that make the surface rise in height, these structures are called volcanoes, the vast majority are near the contact zone of the tectonic plates,

8) Iron  

This is a chemical element that is one of the constituents of the lithospheres, but it is not an essential part of its structure. Iron, for being a heavy element, is believed to be fundamentally in the Earth's nucleus, in the lithosphere it only forms 4.7% of its structure. This is why this box is out of sequence of the second rectangle

Consequently with the characteristics of the lithosphere found that the frame that is out of sequence is:

              last frame: Iron

learn more about lithosphere here:

brainly.com/question/14631600

5 0
3 years ago
NEED ASAP WILL GIVE BRAINLIST
inysia [295]

Answer:

It have 31 electrons

It have 31 electrons

4 0
3 years ago
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