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3 years ago

15

The earth rotates about an imaginary line that passes through the North and South Poles of the planet. This line is called the a

xis of rotation. This rotation is responsible for what we know as _________ on Earth.
A) a day
B) a year
C) the equinox
Eliminate
D) the seasons

1 answer:

slega [8]3 years ago

3 0

The answer is a day, a year is the earth's revolution around the sun

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Ethylene produced by fermentation has a specific gravity of 0.787 at 25 degree Celsius. What is the volume of 125g of ethanol at

WITCHER [35]

<u>Answer:</u> The volume of given amount of ethanol at this temperature is 159.44 mL

<u>Explanation:</u>

Specific gravity is given by the formula:

$\text{Specific gravity}=\frac{\text{Density of a substance}}{\text{Density of water}}$

We are given:

Density of water = 0.997 g/mL

Specific gravity of ethanol = 0.787

Putting values in above equation, we get:

$0.787=\frac{\text{Density of a substance}}{0.997g/mL}\\\\\text{Density of a substance}=(0.787\times 0.997g/mL)=0.784g/mL$

Density is defined as the ratio of mass and volume of a substance.

$\text{Density}=\frac{\text{Mass}}{\text{Volume}}$ ......(1)

Given values:

Mass of ethanol = 125 g

Density of ethanol = 0.784 g/mL

Putting values in equation 1, we get:

$\text{Volume of ethanol}=\frac{125g}{0.784g/mL}=159.44mL$

Hence, the volume of given amount of ethanol at this temperature is 159.44 mL

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2 years ago

You performed an experiment to find out how far three different sizes of

eduard

Answer:

B how much farther does the arrow fly when you use a stronger bow

Explanation:

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3 years ago

A saturated solution of NaCl is formed by adding 500.g of NaCl to 0.500L of water. The excess solid NaCl is filtered from the so

Nata [24]

Answer:

4.96 mol/dm³

Explanation:

From the question,

Mass of NaCl that dissolved in 0.5L of water = 500-346.8 = 153.2 g.

Therefore, 145.2(1/0.5)g of NaCl will dissolve in 1 L of water

mass of NaCl that will dissolve in 1 L of water = 290.4 g/dm³

Molar mass of NaCl = 58.5 g/mol.

Solubility is the amount of substance in mol that will dissolve in 1 L or 1 dm³ Solution.

solubility in (mol/dm³) = solubility in (g/dm³)/molar mass.

solubility in (mol/dm³) = 290.4/58.5

solubility in (mol/dm³) = 4.96 mol/dm³

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3 years ago

Reacts with air..physical or chemical property ;)

Mila [183]

It is a chemical <em>process</em> - an oxidation.

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The constant collisions of the moving particles of a gas with the walls of the container produce the characteristic called

timurjin [86]

Answer:

Pressure

Explanation:

Apply the definition of pressure to this problem.

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2 years ago

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