If the percent (mass/mass) for a solute is 4% akd the mass of the solute is 200g, what is the mass of the solute in the solution?

Answer:

480 mins

Explanation:

Answer:

A. bacteria

Explanation:

can i have brainlest?

The method that can be used to separate the products of the reaction between aqueous lead(II) nitrate and aqueous potassium iodide is filtration (option D).

What is filtration?

Filtration is the mechanical separation of a liquid from the undissolved particles floating in it.

According to this question, a reaction occurs between aqueous lead (II) nitrate and aqueous potassium iodide as shown:

Pb(NO₃)₂(aq) + 2Kl(aq) → Pbl₂(s) + 2KNO₃(aq)

Based on the equation above, lead iodide is a solid product while pottasium nitrate is an aqueous solution.

Filtration is used to separate insoluble solid particles from liquid like the aqueous product, hence, it is a suitable separation technique.

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ZSM-5 is a catalyst material, which has a surface area of 581 m²/g. This is equivalent to a surface area of 5810 cm²/mg.

A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change. Catalysts have large surface areas to increase the reaction rate.

Biological catalysts are known as enzymes.

ZSM-5 is a catalyst material, which has a surface area of 581 m²/g. We want to convert this value to cm²/mg.

We will use the conversion factor 1 m = 100 cm.

581 m²/g × (100 cm/1 m)² = 5.81 × 10⁶ cm²/g

We will use the conversion factor 1 g = 1000 mg.

5.81 × 10⁶ cm²/g × (1 g/1000 mg) = 5810 cm²/mg

ZSM-5 is a catalyst material, which has a surface area of 581 m²/g. This is equivalent to a surface area of 5810 cm²/mg.

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Answer:

0.25 of the original

Explanation:

(0.5)^(90/45)

The fraction of iron-59 after 90 days is 0.25.

Iron-59 decays following first-order kinetics. Given the half-life (\(t_{1/2}\)) of 45 days, we can calculate the rate constant (k) using the following expression.

\(k = \frac{ln2}{t_{1/2}} =\frac{ln2}{45day} = 0.015 d^{-1}\)

For first-order kinetics, we can find the fraction of Fe ([Fe]/[Fe]₀) after and an elapsed time (t) of 90 days, using the following equation.

\(\frac{[Fe]}{[Fe]_0} =e^{-k \times t } = e^{-0.015 d^{-1} \times 90 d } \approx 0,25\)

The fraction of iron-59 after 90 days is 0.25.

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The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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Answer:

2232.5 joules/gm

Explanation:

The specific heat of water and steam (water vapor) are 4.18

J/gºC and 2.10 J/gºC respectively. If 127 kJ of heat is need to

heat a 54.0 g sample of water from 74.20 °C to water vapor at

105.50 °C, what is the heat of vaporization of water in J/g?

Assume the boiling point of water is 100.00 °C.

we have to raise 54.0 gm of water from  74.20 °C  to  100.00 °C,  it will cost

4.18 X54 X (100-74.20) =4.18 X 54 X 25.8 = 5823.6 joules.

once we vaporize the water, we raise the temperature from 100.00  to 105.50C.  this will cost 54 X 2..1 X (105.5  -  100.00)  = 54 X 2.1 X 5.5 =

623.7 joules.

the total thermal cost of the whole process from water at 74.20 °C to steam

at 105.5 °C is 127,000 joules

the cost for vaporizing 54...0 gm of 100.00 °C. liquid water to steam is

127,000 joules  - 623.7 joules  -5823.6 joules =  120552.7 joules

54.0 gm, therefor the heat o vaporize water per gram is

120552.7/54 = 2232.5 joules/gm

The relative atomic mass is 288.60

The relative atomic mass is the sum of the products of the masses of the percentage abundance of each of the isotopes and the mass of that isotope. Recall that an element is composed of isotopes. These isotopes have the same atomic number but different mass numbers.

This implies that the isotopes have different numbers of neutrons. Let us now obtain the relative atomic mass of the element Flerovium.

Percentage abundance of isotope 1 = 2/10 * 100/1 = 20%

Percentage abundance of isotope 2 =  2/10 * 100/1 = 20%

Percentage abundance of isotope 3 =  6/10  * 100/1 = 60%

Then;

(0.2 * 287.2) + (0.2 * 288.2) + (0.6 * 289.2)

= 57.44 + 57.64 + 173.52

= 288.60

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A combustion reaction is a reaction that reacts in the presence of oxygen molecules. Methane will release -3115 kJ/mol of heat.

A combustion reaction includes the reaction between the chemical reactant and oxygen molecule to produce the product. The combustion reaction between methane and oxygen is given as:

CH₄(g) + 2O₂ (g) → CO₂(g) + 2H₂O (l), ΔH = -890 kJ/mol

The stoichiometry coefficient from the reaction gives 1 mole of methane releases -890 kJ/mol enthalpy.

So, 3.5 moles methane will release = 3.5 × -890 = -3115 kJ/mol

Therefore, -3115 kJ/mol of heat is released.

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Answer:

5 hours

Explanation:

In the carbon dioxide molecule has four shared pairs of electrons, there will be four covalent bonds created, hence option B is correct.

In organic chemistry, covalent bonds are far more prevalent than ionic ones. Two nuclei are simultaneously drawn to one or more pairs of electrons to form a covalent connection. Bonding electrons are those that are present between the two nuclei.

When atoms share electron pairs, covalent bonding results. Atoms create covalent bonds with one another in order to build a complete electron shell, which increases stability.

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Answer:

A. tissues are comprised of cells

Answer:

I am pretty sure it is condor because some condors live in the rocky mountains in all over America and Mexico.

Answer:turkey vultures

Explanation:

Answer:

Y > X > Z

Explanation:

The intermoecular forces refer to forces that exist between molecules of a substance. They are the secondary bond forces that hold particles of a substance together in a particular state of matter.

The shorter the distance between molecules, the greater the magnitude of intermolecular force between the molecules.

The molecules of Y are at the shortest distance from each other hence they have the highest magnitude of intermolecular forces. Followed by X and lastly Z with the greatest distance between the largest intermolecular distance.

Answer:

d because the economy will let you but ut

Answer:

C. aquifer

Explanation:

I just did a lesson on this

:)

Gravity causes spacecraft such as stars, planets, moons, and other bodies to orbit one another. Revolution describes this style of movement.

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Using the Henderson-Hasselbalch equation, the pH value when no titrant is added is 4.44.

To solve this problem, we need to use the Henderson-Hasselbalch equation:

where;

We can use this equation to calculate the pH values at different points during the titration.

When no titrant is added:

At this point, we have only the adipic acid in the solution, so we can use the equation:

pH = pKa + log([A-]/[HA])

pH = pKa + log(0/0.1)

pH = pKa = 4.44

pH = 4.44

The other pH values are obtained similarly using the Henderson-Hasselbalch equation.

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Answer:

Formula for effective nuclear charge is as follows. So, for He atom value of S = 0.30 because the electrons are present in 1s orbital. Therefore, calculate the effective nuclear charge for helium as follows. Thus, we can conclude that the effective nuclear charge for helium is 1.7

Explanation:

The effective nuclear charge experienced by a 1s electron in helium is +1.70.

Answer

False

Explanation:

Answer:

220.1 grams of CO2.

Answer:

14 hrs.

Explanation:

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

Time (t) = 42 hrs

Original amount (N₀) = 4.32 g

Amount remaining (N) = 0.54 g

Half-life (t½) =…?

Next, we shall determine number of half-lives required for 4.32 g of the isotope to decay to 0.54 g. This can be obtained as follow:

Original amount (N₀) = 4.32 g

Amount remaining (N) = 0.54 g

Number of half-lives (n) =?

N = 1/2ⁿ × N₀

0.54 = 1/2ⁿ × 4.32

Cross multiply

0.54 × 2ⁿ = 4.32

Divide both side by 0.54

2ⁿ = 4.32 / 0.54

2ⁿ = 8

Express 8 in index form with 2 as the base

2ⁿ = 2³

n = 3

Thus, it took 3 half lives for 4.32 g of the isotope to decay to 0.54 g.

Finally, we shall determine the half-life of the isotope. This can be obtained as follow:

Time (t) = 42 h

Number of half-lives (n) = 3

Half-life (t½) =

n × t½ = t

3 × t½ = 42

Divide both side by 3

t½ = 42 / 3

t½ = 14 hrs

Thus, the half-life of the isotope is 14 hrs

True;

The earth is currently in an interglacial period

Climate has changed naturally over the earth's history

False

The increase since 1860 is similar to previous increases

Atmospheric composition have remained the same throughout earth history.

Atmospheric carbon dioxide has increased significantly since 1860, primarily due to human activities such as burning of fossil fuels and deforestation.

There are also seasonal variations in CO2 concentrations, with higher concentrations in the winter months and lower concentrations in the summer months. This is because the majority of the world's vegetation is in the Northern Hemisphere, and during the winter months, there is less photosynthesis occurring to remove CO2 from the atmosphere.

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Answer:

Mg3N2

Explanation:

divide 50 by 6 (molar ratio) and you get something more than 8

since Mg3N2 is less it is the limiting reactant

Answer:

KCIO

Explanation:

the only reason is because I looked online and the meaning for that is potassium hypochlorite my guy so if this is not right then I'm sorry but good luck.

Answer:

Use the formula below

Explanation:

use the moles ratio for this by writing down the reaction and balancing the equation