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3 years ago

Express 7.25 in scientific notation

Chemistry

2 answers:

Ivan3 years ago

7 0

I am pretty sure it is 7.25 * 10

Hope this helps best of luck sorry if i am wrong

~animaljamissofab

shutvik [7]3 years ago

5 0

7.25 x 10 , Hope this helps out.

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Module 2 dba for chemistry questions? flvs

NeX [460]

Can you translate to english?

4 0

4 years ago

Azurite, 2 CuCO3 * Cu(OH)2 is blue and malachite, CuCO3 * Cu(OH)2 is green. Which contains the higher percentage of copper? Each

blagie [28]

Answer:

Malachite green has highest percentage of copper.

Explanation:

Azurite: $2CuCO_3.Cu(OH)_2$

Molar mass of Azurite = M = 344.67 g/mol

Atomic mass of copper = 63.55 g/mol

Percentage of copper in Azurite :

$Cu\%=\frac{3\times 63.55 g/mol}{344.67 g/mol}\times 100=55.31\%$

The percentage of copper in an azurite is 55.31%.

Malachite: $CuCO_3.Cu(OH)_2$

Molar mass of Malachite = M = 221.12 g/mol

Atomic mass of copper = 63.55 g/mol

Percentage of copper in Malachite:

$Cu\%=\frac{2\times 63.55 g/mol}{221.12 g/mol}\times 100=57.48\%$

The percentage of copper in an malachite is 57.48%.

4 0

3 years ago

A ball is moving at a speed of 6.70 m/s. If the kinetic energy of the ball is 3.10 J, what is the mass of the ball?

Anni [7]

Answer:

Explanation:

The mass of the ball can be found by using the formula

$m = \frac{2k}{ {v}^{2} } \\$

v is the velocity

k is the kinetic energy

From the question we have

$m = \frac{2(3.10)}{ {6.70}^{2} } = \frac{6.20}{44.89} \\ = 0.138115...$

We have the final answer as

Hope this helps you

7 0

3 years ago

Suppose now that you wanted to determine the density of a small crystal to confirm that it is boron. From the literature, you kn

Phantasy [73]

Answer:

the volume of CHCI3 = 7.87 ml

the volume of CHBr3 = 12.13 ml

Explanation:

From the given information:

We all know that 1 g/cm^3 = 1 g/ml

The density of boron = 2.34 g/ml

The Volume of the liquid mixture = 20 ml

Recall that:

Density = mass/volume

Mass = Density × Volume

Mass = 2.34 g/ml × 20 ml

Mass = 46.8 g

Suppose the volume of CHCI3 be Y and the Volume of CHBr3 be 20 - Y

Then :

Y (1.492) + 20-Y(2.890) = 46.8

1.492Y + 57.8 - 2.890Y = 46.8

- 1.398 Y = -11

Y = -11/ - 1.398

Y = 7.87 ml

Therefore, the volume of CHCI3 7.87 ml

the volume of CHBr3 = 20 - Y

= 20 - 7.87

= 12.13 ml

3 0

3 years ago

Why do nonmetals tend to gain electrons to form negative ions?

kompoz [17]

Answer:

they gain the few electrons they need to form full octets

8 0

3 years ago