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3 years ago

3. Round each measurement to three significant figures. Write your

Chemistry

1 answer:

Mekhanik [1.2K]3 years ago

4 0

In scientific notation, the measurement of each figure to three significant measurements are as follows:

87.073 meters = 8.71 × 10⁻¹ meters
4.3621 × 10⁸ meters = 4.36 × 10⁸ meters
0.01552 meter = 1.55 × 10² meters
9009 meters = 9.01 × 10² meters
1.7777 x 10-3 m = 1.78 × 10⁻³ meters
629.55 meters = 6.30 × 10² meters

A significant figure is the digits in a number that is dependable and absolutely essential to express the quantity of a figure in positional notation. They are utilized to represent the appropriate degree of precision.

A scientific notation is used to express a large number in an easy decimal way multiplied by its power of 10.

From the given information, in scientific notation, and to three significant figures, we have:

87.073 meters = 8.71 × 10⁻¹ meters
4.3621 × 10⁸ meters = 4.36 × 10⁸ meters
0.01552 meter = 1.55 × 10² meters
9009 meters = 9.01 × 10² meters
1.7777 x 10-3 m = 1.78 × 10⁻³ meters
629.55 meters = 6.30 × 10² meters

Therefore, from the above concept, we can conclude that the scientific notation of each figure in three significant figures is shown in bold format.

Learn more about scientific notation here:

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If you had equal masses of each of the following substances, which would occupy the greatest volume?

nirvana33 [79]

Cocoa butter occupies the greatest volume.

Cocoa butter is 9/0 it's close to ICL but cocoa butter is the smallest end this one will take off the most volume because it is divided by the smaller density.

It is important not to overheat the Baker when drying the sodium chloride because by these comments won't be loss and Baker was properly heat.

<h3>What is cocoa butter good for?</h3>

Vitamin E has several health advantages for the body, and cocoa butter is a good source of this vitamin. The health of your blood, brain, skin, and reproductive system are all supported by vitamin E. Due to its high fatty acid content, cocoa butter is an excellent choice as the main component of skin creams.

<h3>Complete question - </h3>

If you had equal masses of each of the following substances, which would occupy the greatest volume?

a. ice (d = 0.917 g/mL)

d. cocoa butter (d = 0.910 g/mL)

b. water (d = 0.997 g/mL)

e. aluminum (d = 2.70 g/mL)

c. beeswax (d = 0.960 g/mL)

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3 0

2 years ago

The volume of an ideal gas is held constant. Determine the ratio P2/P1 of the final pressure to the initial pressure when the te

cricket20 [7]

Answer:

A. P₂ / P₁ = 2

B. P₂ / P₁ = 1.1

Explanation:

A. Determination of the ratio P₂/P₁

Volume = constant

Initial temperature (T₁) = 46 K

Final temperature (T₂) = 92 K

Final pressure /Initial pressure (P₂/P₁) =?

P₁/T₁ = P₂/T₂

P₁/46 = P₂/92

Cross multiply

46 × P₂ = P₁ × 92

Divide both side by P₁

46 × P₂ / P₁ = 92

Divide both side by 46

P₂ / P₁ = 92 / 46

P₂ / P₁ = 2

B. Determination of the ratio P₂/P₁

Volume = constant

Initial temperature (T₁) = 35.4 °C = 35.4 + 273 = 308.4 K

Final temperature (T₂) = 69.0 °C = 69 + 273 = 342 K

Final pressure /Initial pressure (P₂/P₁) =?

P₁/T₁ = P₂/T₂

P₁/308.4 = P₂/342

Cross multiply

308.4 × P₂ = P₁ × 342

Divide both side by P₁

308.4 × P₂ / P₁ = 342

Divide both side by 308.4

P₂ / P₁ = 342 / 308.4

P₂ / P₁ = 1.1

5 0

3 years ago

NaCl has a Delta. Hfus = 30. 2 kJ/mol. What is the mass of a sample of NaCl that needs 732. 6 kJ of heat to melt completely? Use

tia_tia [17]

The mass of NaCl sample has been 24.3 g. Thus, option A is correct.

The heat of fusion has been the amount of heat required to convert 1 mole of substance into solid to liquid state.

The heat required has been given as:

$Q=m\Delta H$

<h3>Computation for the mass of NaCl</h3>

The given solution has heat of fusion, $\Delta H_{fus}=30.2\rm kJ/mol$

The heat required to melt the sample has been, $Q=732.6\;\rm kJ/mol$

Substituting the values for the mass of NaCl

$\rm 732.6\;kJ/mol=Mass\;\times\;30.2\;kJ/mol\\\\
Mass=\dfrac{732.6}{30.2}\;g\\\\
 Mass=24.3\;g\\$

The mass of NaCl sample has been 24.3 g. Thus, option A is correct.

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What does the formula H2O mean

forsale [732]

2 hydrogen and 1 oxygen makes water

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Relation between glancing and angle of deviation<br>

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Answer:

the Glancing angle is the angle between the incident ray and plane mirror which is 90o in the given case. The angle between the direction of the incident ray and the reflected ray is the angle of deviation. Since the angle of deviation for a plane mirror is twice the glancing angle, the angle of deviation is 1800.

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