Why do the 8 phases of the moon occur

1 answer:

4 0

The phases of the moon occur because the moon orbits earth which causes the portion illuminated to change. The earth casts changing angles on the moon causing portions to be illuminated or dark.

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If the concentration of brown sand is 2.0 ppm, how many grains of brown sand are in the bucket?

AysviL [449]

I believe the complete given is that the bucket of sand contains 9.5 billion grains of sand. That is:

bucket = 9,500,000,000 grains

and the concentration of brown sand is 2 ppm:

concentration brown sand = 2 / 1,000,000

Therefore:

brown sand = 9,500,000,000 * (2 / 1,000,000)

brown sand = 19,000 grains

8 0

3 years ago

If 1000. ml of linseed oil has a mass of 929 g, calculate the density of linseed oil

Ierofanga [76]

0.929 g/ml Density in this case is defined as mass per volume. Or in other words, mass divided by volume. So you simply divide 929 grams by 1000 ml. Giving 929 g / 1000 ml = 929/1000 g/ml = 0.929 g/ml

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3 years ago

Draw the structures of organic compounds a and b omit all by products thf

Brums [2.3K]

The reaction is shown below,

Step 1: Hydration of Alkene:
In first step Ethene is hydrated to Ethanol through Hydroboration Reaction.

Step 2: Oxidation of Primary Alcohol:
In this step partial oxidation of ethanol is carried out using mild Oxidizing agent Pyridinium chlorochromate (PCC) and Acetaldehyde is produced.

Step 3: Reduction of Acetaldehyde followed by Oxidation:
In this step, first acetaldehyde is reduced to secondary alcohol using grignard reagent. After that the sec. alcohol is oxidized to ketone by using oxidizing agent CrO₃.