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3 years ago

PLEASE HELP!

Chemistry

1 answer:

Mice21 [21]3 years ago

5 0

Answer:

The Axis Powers took these aggressive actions prior to the outbreak of World War II which include the invasion of Ethiopia, Manchuria, and the Rhineland.

Explanation:

Axis Powers: It was the coalition of Germany, Italy and Japan against the Allied Powers (the United States, the Soviet Union, Great Britain, and China) in World War II.

In 1930, the Japanese took control of railway track in Manchuria (a region in China) and in 1931, the Japan attacked the Chinese army claiming that the Chinese soldiers sabotaged the railway.
On 3 October 1935, Italy invaded the Ethiopia (former name: Abyssinia) in the leadership of Mussolini to expand its territories.
Germany in the leadership of Adolf Hitler occupied the Rhineland in 1937 by making excuse that the area is hostile and dangerous for them.

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If you have 1.005 x 1024 molecules of Ca(OH)2 how many atoms do you have? Moles? Grams?

ira [324]

Answer:

5.025x10²⁴ atoms

1.6686 moles

123.63 g

Explanation:

In one Ca(OH)₂ molecule, there are 5 atoms (1 Ca, 2 O and 2 H). This means that in 1.005x10²⁴ Ca(OH)₂ molecules, there are (5 * 1.005x10²⁴) 5.025x10²⁴ atoms.

To convert molecules into moles, we use Avogadro's number:

1.005x10²⁴ molecules * $\frac{1mol}{6.023*10^{23}molecules}$ = 1.6686 moles

Finally, we convert moles into grams using the molar mass of Ca(OH)₂:

1.6686 moles * 74.093 g/mol = 123.63 g

4 0

2 years ago

If a concentration of 10 fluorescent molecules per μm2of cell membrane is needed to visualize a cell under the microscope, how m

lara [203]

Answer : Total molecules that will be needed to visualize a single egg will be 78500 molecules of dye.

Explanation : As a single egg cell has an approximately diameter of 100 μm.

We can use this formula to calculate area of the cell membrane;

A = π $(100)^{2} / 4$ ;

We can take π as 3.14 and we get;

A = 3.14 X $(100)^{2} / 4$

Soving we get;

A = 7850 μ $m^{2}$

Here we have to calculate the amount of dye molecules which will be needed for 10 fluorescent molecules / μ $m^{2}$ but;

here 1 μ $m^{2}$ = 7850 μ $m^{2}$ dye molecules.

Therefore, 10 fluorescent molecules will need;

7850 X 10 = 78500 molecules of dye.

Therefore, the answer is 78500 molecules of dye.

6 0

3 years ago

Someone pls answer these questions ASAP thank you:)

babunello [35]

Answer: I kin tommyinnit

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2 years ago

If the temperature of a piece of steel decreases, what happens to its density? a. The density decreases. b. The density increase

vampirchik [111]

Answer:

Explanation:

4 0

3 years ago

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Conclusion: Summarize the results of this experiment in one or two sentences. What

GaryK [48]

Answer:

The flame test is used to visually determine the identity of an unknown metal or metalloid ion based on the characteristic color the salt turns the flame of a Bunsen burner.

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2 years ago