the diagram below represents the electromagnetic spectrum with some of the regions labeled with letters. Visble light is represented by which letter?

Answer:

0.02 kg

Explanation:

A P E X

The energy released by the decay process is  1.8 x 10¹⁵ J. Therefore the mass of the radioactive substance is 0.02 Kg.

Heavy unstable radioactive nuclei undergoes nuclear decay by the emission of charged particles to form more stable nuclei.

The relationship between energy and mass is given by Einstein's famous equation, E = mc², where E is the energy released in a process, m is the mass lost or gained in the process, and c is the speed of light.

To calculate the mass lost through radioactive decay, we need to rearrange this equation to solve for m:

m = E / c²

Plugging in the given energy released, E = 1.8 x 10^15 J, and the speed of light, c = 3 × 10⁸m/s, we get:

m = (1.8 x 10¹⁵ J) / ( 3 × 10⁸ m/s)²

m = 1.8 x 10¹⁵ J /9 x 10^16 m²/s²

m =0.02 kg

Therefore, the mass lost through radioactive decay is approximately 0.02 kg.

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Explanation:

After calculating the density of the material we can tell if the object will sink or float without placing it in water by comparing their density.

This way, comparing the density values of both substances can tell us whether they will float or sink.

Answer:

Physical Change. A change of matter from one form to another without a change in chemical properties. Chemical Change. A change that occurs when one or more substances change into entirely new substances with different properties.

Explanation:

Answer:

high boiling aromatics

with the same ground glass joint.

Explanation:

The black connectors are more resistant to the reactant than the white connectors. This implies that the black connectors should be used when high boiling aromatics are present, Else, the tan connections can be used.

Thus, the connectors can combine different pieces of glassware or components with the same ground glass joint.

Answer:chlorophyll

Explanation:

The part of leaves that is responsible for absorbing sun's energy is chloroplast.

A chloroplast is an organelle found within the cells of plants and certain algae that is responsible for photosynthesis, which is the process by which solar energy is converted into chemical energy for growth.

Small organelles called chloroplasts are found inside plant cells and store sunlight energy.

The chloroplast's thylakoid membranes contain a light-absorbing pigment called chlorophyll, which is responsible for the plant's green color.

They are in charge of photosynthesis, which is the process of converting light energy into sugar and other organic molecules that plants and algae use as food.

They also produce amino acids and lipids, which are required for the production of chloroplast membranes.

Thus, the chloroplast is the part that traps the energy of the Sun.

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Answer:

Explanation:

Dry I can't c it

Answer:

Heat the water i'm pretty sure

Explanation:

Answer:

D. a new substance is formed.

Explanation: "Chemical reactions involve combining different substances. The chemical reaction produces a new substance with new and different physical and chemical properties. Matter is never destroyed or created in chemical reactions. The particles of one substance are rearranged to form a new substance." B. and C. are two different effects of chemical reaction, but not for all. Hope this helps ^-^.

Answer: C.

Explanation: Please mark Brainlest Pleasee

Answer:

A

Explanation: The rubber around the wire is an insulator, and the wire i would imagine would be made out of something like copper.  Electricity runs through everything and without the insulator there, you'd be touching metal that electricity is running through.

Answer:

18.4g

Explanation:

Given parameters:

Percentage composition:

49.47%  carbon

5.19% H

28.8% N

16.48% O

Mass of caffeine   = 37.1g

Unknown:

Mass of carbon  = ?

Solution:

To find the mass of the carbon:

  Mass of carbon = percentage composition of carbon x mass of caffeine

 Mass of carbon  = 49.47% x 37.1  = 18.4g

Hey there!

Molar mass NaCl = 58.44 g/mol

58.44 g ----------------- 22.4 ( at STP )

3.2 g -------------------- Volume ??

Volume = ( 3.2 x 22.4 )  / 58.44

Volume = 71.68 / 58.44

Volume = 1.226 L

Hope this helps!

Answer:

V = 0.56 L

Explanation:

Given data:

Mass of NaCl = 3.2 g

Volume of chlorine gas = ?

Pressure and temperature = standard

Solution:

Chemical equation:

2NaCl    →     2Na + Cl₂

Number of moles of NaCl:

Number of moles = mass/molar mass

Number of moles = 3.2 g/ 58.44 g/mol

Number of moles = 0.05 mol

Now we will compare the moles of NaCl with chlorine;

              NaCl       :          Cl₂

                 2          :           1

                0.05      :       1/2×0.05 = 0.025 mol

Volume of chlorine:

PV = nRT

V = nRT/P

V = 0.025 mol × 0.0821 atm.L/mol.K × 273 K / 1 atm

V = 0.56 L

Answer:

These people painted mostly animals that they most likely hunted as a major source of food, and in doing so left behind evidence of their activities i think

Explanation:

Answer:

No, it is not sufficient

Please find the workings below

Explanation:

Using E = hf

Where;

E = energy of a photon (J)

h = Planck's constant (6.626 × 10^-34 J/s)

f = frequency

However, λ = v/f

f = v/λ

Where; λ = wavelength of light = 325nm = 325 × 10^-9m

v = speed of light (3 × 10^8 m/s)

Hence, E = hv/λ

E = 6.626 × 10^-34 × 3 × 10^8 ÷ 325 × 10^-9

E = 19.878 × 10^-26 ÷ 325 × 10^-9

E = 19.878/325 × 10^ (-26+9)

E = 0.061 × 10^-17

E = 6.1 × 10^-19J

Next, we work out the energy required to dissociate 1 mole of N=N. Since the bond energy is 418 kJ/mol.

E = 418 × 10³ ÷ 6.022 × 10^23

E = 69.412 × 10^(3-23)

E = 69.412 × 10^-20

E = 6.9412 × 10^-19J

6.9412 × 10^-19J is required to break one mole of N=N bond.

Based on the workings above, the photon, which has an energy of 6.1 × 10^-19J is not sufficient to break a N=N bond that has an energy of 6.9412 × 10^-19J

We have that for the Question  it can be said that the volume of water must be added to 250 mL of a 25% w/v stock solution of sodium chloride to prepare a 0.9% w/v sodium chloride solution is

x=444ml

From the question we are told

. H ow many milliliters of water must be added to 250 mL of a 25% w/v stock solution of sodium chloride to prepare a 0.9% w/v sodium chloride solution

Generally the equation for the volume of NaCl   is mathematically given as

[tex]V=\frac{25}{100}*250\\\\V=62.5ml[/tex]

Therefore

[tex]\frac{62.5}{250+x}*100=0.9\\\\x=6250-2250\\\\x=4000ml\\\\x=444ml[/tex]

Therefore

the volume of water must be added to 250 mL of a 25% w/v stock solu- tion of sodium chloride to prepare a 0.9% w/v sodium chloride solution is

x=444ml

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Answer:

167.980.

Explanation:

Hello!

In this case, since additions involving the display of the result with the appropriate number of significant figures involve the solution of the system without looking at them:

[tex]156.325 +11.65498 =167.97998[/tex]

Considering that 156.325 is significant to the thousandths and 11.65498 to the hundred thousandths, we infer that the result should be taken to the thousandths as well as 156.325; thus, we obtain:

[tex]167.980[/tex]

Because the second decimal nine is rounded to ten and therefore the 7 is taken to 8.

Best regards!

Answer:

(I'm not sure tbh) It's C Polypeptides are formed by 10 or more amino acids

Answer:

Soil erosion will increase because there are fewer plants to stabilize the soil.

Explanation:

study island

Answer:

Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged).

Explanation:

Answer:

Mass = 2.65 g

Explanation:

Given data:

Mass of sodium carbonate = ?

Mass of water = 0.125 g

Molality = 0.200 m

Solution:

Formula:

Molality = number of moles of solute / mass of solvent in Kg

by putting values,

0.200 m = Number of moles of solute / 0.125 kg

Number of moles = 0.200 m × 0.125 kg

Number of moles = 0.025 mol

Mass of sodium carbonate:

Mass = number of moles × molar mass

Mass = 0.025 mol × 106 g/mol

Mass = 2.65 g

Answer: A. It is made of polar molecules.

Explanation:

A polar molecule refers to a molecule that has a covalent bond but has an uneven distribution of electrons due to an atom in the molecule having strong electronegativity which will attract more of the electrons from the other atom.

Water is such a molecule because Oxygen has strong electronegativity which leads to electrons being pulled to it.

Answer:

e

Explanation:

Answer: deposition

extra words lol

Answer:

Option C. 24 days / 4 grams

Explanation:

From the question given above, the following data were obtained:

Days Elapsed >>>> Mass Remaining

0 >>>>>>>>>>>>>>> 16

12 >>>>>>>>>>>>>>> 11

24 >>>>>>>>>>>>>>> 8

36 >>>>>>>>>>>>>>> 6

A. Determination of the half-life of Thorium-234.

To determine the half-life, it is important to know the definition of half life.

Half-life is defined as the time taken for a substance to reduce to half its original mass.

From the table given above, we can see that the original mass of the isotope is 16 g (i.e at 0 day). By day 24, the mass of the isotope is 8 g (i.e half the original mass). Thus, the half-life of the isotope is 24 days.

B. Determination of the mass of the isotope remaining after 2 half lives.

Original amount (N₀) = 16 g

Number of half-lives (n) = 2

Amount remaining (N) =?

N = 1/2ⁿ × N₀

N = 1/2² × 16

N = 1/4 × 16

N = 4 g

Thus, 4 g of the isotope is remaining after 2 half lives.

Summay:

Half-life = 24 days

Amount remaining after 2 half-lives = 4 g

Option C gives the correct answer to the question.

Answer:

Batteries hold chemical energy

Explanation:

The battery acid in a battery leads to chemical energy.

Answer:

B

Explanation:

I hope it helps you good luck

Answer:

There are 6.022x10^23

Explanation:

plzz put me as brainest

Answer:

A Where warm, moist air masses traveling north collide with cool,

dry air masses traveling south