What is mars average distance from the sun

What is the first step of a ladybug during the growth and development process

Sunny_sXe [5.5K]

Answer:

Damian here! (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧

The newly hatched larva is in its first instar, a developmental stage that occurs between molts. It feeds until it grows too big for its cuticle, or soft shell, and then it molts. After molting, the larva is in the second instar. Ladybug larvae usually molt through four instars, or larval stages, before preparing to pupate.

Explanation:

hope this helps? :))

7 0

3 years ago

The reaction between an organic acid and an alcohol produces

NARA [144]

If it’s a carboxylic acid with an alcohol then it’ll form an ester and water.

5 0

3 years ago

Chemistry problem. Is alcohol soluble in water?

stiv31 [10]

Alcohol is completely soluble in water in any amounts. That is because every alcohol contains carbon chain and OH group which are non-polar and polar. Any substances or solutes that will be mixed with the alcohol you will just get a simple solution.

5 0

3 years ago

Explain the greenhouse effect in terms of wavelengths of radiation

mixer [17]

Answer:

The greenhouse effect is a phenomenon that occurs when the incoming Solar radiation, which is partially absorbed and partially reflected from the Earth's surface, is then absorbed and re-emitted by the molecules of gas in the atmosphere, causing an increase in the Earth's temperature.

More specifically, the phenomenon occurs as follows:

- The Sun emits electromagnetic radiation in the entire spectrum - therefore, all wavelengths. However, the peak of its radiation is in the visible part of the spectrum, specifically around the yellow color (around 500-600 nm)

- The radiation from the Sun reaches the Earth and passes through the atmosphere, reaching the Earth's surface

- Part of this radiation is absorbed by the surface, while part is re-emitted. However, the radiation is re-emitted at a longer wavelength, in the infrared part of the spectrum (700 - 1000 nm)

- As a result, when this infrared radiation reaches the atmosphere, it is absorbed by the molecules of some gases, which therefore absorbs this radiation and re-emit is in every direction (also towards the surface)

As a result of this radiation emitted by these gases, the Earth's temperature increases.

3 0

3 years ago

According to the experimental procedure of Experiment F1, 135 microliters of acetophenone (120.15 g/mol, 1.03 g/mL) was reacted

Delicious77 [7]

Answer: The theoretical yield of 4-nitrochalcone is, $2.13\times 10^2$

Explanation : Given,

Volume of acetophenone = 135 microliters = 135 × 10⁻⁶ L = 0.135 mL

conversion used : (1 microliter = 10⁻⁶ L) and (1 L = 1000 mL)

Density of acetophenone = 1.03 g/mL

Mass of acetophenone = Density × Volume = 1.03 g/mL × 0.135 mL = 0.139 g

Mass of 4-nitrobenzaldehyde = 127 mg = 0.127 g

Conversion used : (1 mg = 0.001 g)

First we have to calculate the moles of acetophenone and 4-nitrobenzaldehyde

$\text{Moles of acetophenone}=\frac{\text{Given mass acetophenone}}{\text{Molar mass acetophenone}}$

$\text{Moles of acetophenone}=\frac{0.139g}{120.15g/mol}=0.00116mol$

and,

$\text{Moles of 4-nitrobenzaldehyde}=\frac{\text{Given mass 4-nitrobenzaldehyde}}{\text{Molar mass 4-nitrobenzaldehyde}}$

$\text{Moles of 4-nitrobenzaldehyde}=\frac{0.127g}{151.12g/mol}=0.000840mol$

Now we have to calculate the limiting and excess reagent.

The balanced chemical equation is:

$C_8H_8O+C_7H_5NO_3\rightarrow C_{15}H_{11}NO_3$

From the balanced reaction we conclude that

As, 1 mole of 4-nitrobenzaldehyde react with 1 mole of acetophenone

So, 0.000840 mole of 4-nitrobenzaldehyde react with 0.000840 mole of acetophenone

From this we conclude that, acetophenone is an excess reagent because the given moles are greater than the required moles and 4-nitrobenzaldehyde is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of 4-nitrochalcone

From the reaction, we conclude that

As, 1 mole of 4-nitrobenzaldehyde react to give 1 mole of 4-nitrochalcone

So, 0.000840 mole of 4-nitrobenzaldehyde react to give 0.000840 mole of 4-nitrochalcone

Now we have to calculate the mass of 4-nitrochalcone

$\text{ Mass of 4-nitrochalcone}=\text{ Moles of 4-nitrochalcone}\times \text{ Molar mass of 4-nitrochalcone}$