All categories

3 years ago

Which of the following happens during a lunar eclipse?

Chemistry

1 answer:

Svetlanka [38]3 years ago

5 0

Answer:

a. Earth casts a shadow on the moon.

Explanation:

Lunar eclipse occurs when Earth comes in between sun and moon. The sunlight falling on moon is blocked by Earth and the shadow of earth falls on moon. This happens on full moon day when sun, earth and moon align in one line.The moon passes through the shadow of earth and appears dark.

Thus, the correct option is a.

You might be interested in

Organism in kingdoms archaebacteria live in environments that are very hot or very cold Which other characteristics is common to

vodomira [7]

Answer:

Archaebacteria belong to the kingdom 'Archaea'. They resemble bacteria when observed under a microscope.They are single-cell organisms. However,they differ from prokaryotes in many ways.

•They have a completely different cell membrane so that they can survive and thrive in harsh environments

•Unlike bacteria,their cell wall and membrane can be stiff and gives a specific shape such as flat,rod shaped or cubic.

•the absence of peptidoglycan in cell wall,instead contain lipid and protein to give them strength and resistance against chemical.

•The cell membrane of archae are made up of phospholipid bilayer but unlike bacteria and eukaryotes,the bilayers have ether bonds.These ether bonds have the ability to resist chemical and helps them to survive in very extreme environments that might otherwise kill them.

•They have multiple RNA polymerase that contain multiple polypeptide

•They have initiator tRNA with unmodified methionine(unlike bacteria).

•They have the ability to survive in very high temperatures,in acidic environment and alkaline environments and even have tolerance for high salt content.

6 0

3 years ago

a grignard synthesis begins with 6.00 g of bromobenzene and ends with 3.56 g benzoic acid. what is the percent yield of the benz

Paha777 [63]

The percent yield of the benzoic acid is 59.33 %

Grignard averages should not contain acidic hydrogens as they are destroyed when they are on the compound. A Grignard reaction is an organometallic chemical reaction in which an alkyl, allyl, vinyl, or aryl magnesium halide adds to the carbonyl group of an aldehyde or ketone. This reaction is important for the formation of carbon-carbon bonds.

Calculation:-

percentage yield = calculated/theoretical

= 3.56/6.00 × 100

= 59.33 %

The carbon atoms of Grignard reagents are partially negatively charged, so they resemble carbanions and react with electrophiles. Grignard reagents are highly reactive reactants used synthetically to form new carbon-carbon bonds. Grignard reagents are made by reacting alkyl halides with magnesium in the presence of dry ether. Chemistry: Grignards are very important reagents in chemistry as they can be used to form a wide variety of compounds.

Learn more about Benzoic acid here:-brainly.com/question/28299797

#SPJ4

3 0

1 year ago

Grams. Number only, rounded to the One mole of silver weighs hundredths place (.01) *Y

jek_recluse [69]

Answer:

107.87 grams

Explanation:

One mole of silver weighs 107.87 grams .

7 0

3 years ago

Jorge inflates a beach ball to a volume of 4L in his air-conditioned house where the temperature is 18℃. That afternoon he takes

balandron [24]

Answer:

The beach ball will get larger at the beach because the molecules are moving faster.

Explanation:

We can answer this problem by using Charle's Law, which states that:

"For a constant mass of an ideal gas kept at constant pressure, the volume of the gas is directly proportional to its temperature"

Mathematically:

$V\propto T$

where

V is the volume of the gas

T is the absolute temperature of the gas

Here, we are analyzing the air inside the ball (the gas). We are also told that when the ball is brought to the beach, the pressure does not change: therefore, we can apply Charle's Law.

We are told that when the ball is brought to the beach, the temperature increases from 18℃ to 32℃: therefore, since the volume of the air (and the ball) is proportional to the temperature, this means that the volume of the ball will increase as well.

The reason for this is that the ball is not thermally isolated, so the molecules of the air inside the ball reach soon the same temperature of the surroundings, and so they will move faster (higher temperature means higher average kinetic energy of the molecules, so the molecules move faster, and therefore the ball will expand).

So the correct option is

The beach ball will get larger at the beach because the molecules are moving faster.

8 0

4 years ago

How do you think this food web would be affected if the plants were eliminated

NNADVOKAT [17]

The Answer would be C. Without plants in the ecosystem, it could not feed. Plants are mainly the only producers that feed 3rd level consumers which feed 2nd level consumers which feed 1st level consumers.

4 0

4 years ago