Lewis dot structure for H2CCCl2?

⇒ 0.018

-use pH=-log[H3O+]

-solve for H3O+

The decay rate of the radioisotope on the previous morning at 10 am is 38.7 million decays per second.

The initial mass of the radioisotope is calculated as follows;

N = N₀(¹/₂)^t/h

where;

24 M/s = N₀(¹/₂)^(22/32)

24 M/s = N₀(0.62)

N₀ = (24 M/s)/(0.62)

N₀ = 38.7 M/s

Thus, the decay rate of the radioisotope on the previous morning at 10 am is 38.7 million decays per second.

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Using the given formula, the density of the material is 2.015 g/mL

From the question, we are to determine the density of the material

From the given formula

Density = Mass / Volume

And from the given information,

Mass = 65.5 g

and volume = 32.5 mL

Putting the parameters into the equation,

Density = 65.5/32.5

Density = 2.015 g/mL

Hence, the density of the material is 2.015 g/mL.

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Find solubility

So half amount of solute is dissolved .

Hence the solution is saturated

The partial pressure of the hydrogen gas, if the water vapor pressure is 3.17kPa is 91.83 kPa.

Dalton's law of gas states that total pressure of the mixture of gas is equal to the sun of the partial pressure of the individual gas.

Given that,

Total pressure of hydrogen gas = 95 kPa

Partial pressure of water vapor = 3.17 kPa

Partial pressure of hydrogen gas will be calculated as:
Partial pressure = 95 - 3.17 = 91.83 kPa

Hence required partial pressure is 91.83 kPa.

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Answer:

It's the basic unit of an element.

something that makes up everything that has mass

Explanation:

Answer:

A. O, S, Se

Explanation:

They are all considered "other nonmetals," found in row 16 of the periodic table, and are chalcogens. The other options don't have as much in common.

Yes, at high temperature and pressure (1011 kpa), diamond can change directly (sublime) into gaseous form.

Diamond is a solid form of the carbon element with its atoms arranged in a crystal structure called diamond cubic.

Diamond has some interesting properties, which is written below;

A diamond interacts with oxygen in the air and disappears to form carbon dioxide.

Thus, at high temperature and pressure (1011 kpa), diamond can change directly (sublime) into gaseous form.

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Answer:

Anhydrous copper sulphate.

Explanation:

In the presence of water anhydrous copper sulphate , a white powder, turns to blue.

Answer:

57)a)increase

b)increase

c)pressure

58)

Answer:

soft water can leath with soap whiles hard water cannot be leathers with soap

Answer:

Hard water is water with excess calcium and magnesium, while soft water lacks harsh minerals that can hurt your body.

Explanation:

Also, in hard water, soap is not so effective (little or no foam) and in soft water soap is easily effecive (foams easily).

Answer:

744.0 mL

Explanation:

Formula obtained from Charles Law :

⇒ [tex]\frac{V_{1} }{T_{1} } = \frac{V_{2} }{T_{2} }[/tex]

===============================================================

Given :

⇒ V₁ = 780.0 mL

⇒ T₁ = 30 °C = 303 K

⇒ T₂ = 16 °C = 289 K

=============================================================

Solving :

⇒ V₂ = 780 × 289 / 303

⇒ V₂ = 225420 / 303

⇒ V₂ = 744.0 mL (approximately)

The observation in the illustration remains in accordance with the law of conservation of mass assuming that moisture is present in the container.

The law state that mass can neither be created nor destroyed. However, mass can be converted from one form to another.

In this case, the ion was placed in a container of pure oxygen. Assuming that moisture is present, iron reacts with oxygen to form rust according to the following equation:

[tex]4Fe + 3O_2 + 6H_2O --- > 4Fe(OH)_3[/tex]

The rust formed will weigh more than the initial weight of the iron.

Without the presence of moisture, one can effectively conclude that the observation violates the law of conservation of mass.

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Answer:

As temperature increases, its solubility increases as well. Notice, however, that it does not increase significantly. In fact, you can expect to be able to dissolve no more than 40 g of sodium chloride per 100 g of water at 80∘C

Explanation:

As temperature increases, its solubility increases as well. Notice, however, that it does not increase significantly. In fact, you can expect to be able to dissolve no more than 40 g of sodium chloride per 100 g of water at 80∘C

Answer:

Ashley, Ron, and Lindsay

Explanation:

Ultrasound technology is used for medical purposes by a scanning machine that allows to obtain living images of the inside of the body. For the type of issues they are going trough, ultrasound technology would help patients Ashley, Ron, and Lindsay. Ashley's under-developing fetus, Ron's kidney stones and, Lindsay's uterus cancer can be monitored by using ultrasound technology.

The ultrasound technology is a medical tool which can help a physician to evaluate, diagnose and treat medical conditions. Here the patients  with Ron, and Lindsay kidney stones and cancer can be detected by ultrasound technology. The correct option is D.

A term for the disease in which the abnormal cells divide without control and can invade nearby tissues is defined as cancer. The cancer cells can also spread to the other parts of the body through the blood and lymph systems.

Kidney stones are the hard deposits made of minerals and salts which form inside our kidneys. It is mainly caused due to little drinking of water, obesity, eating food with high salt or sugar content.

The ultrasound technology can detect cysts, tumors, obstructions or infections within or around your kidneys. It is also used by the medical professionals for many purposes including the pregnancy related problems.

Thus the correct option is D.

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5 mols of O_2 need 4 mol NH_3

Now

Moles of Ammonia

Moles of NO=0.3mol

Mass of NO

So

Moles of Oxygen

Remaining moles

Mass

Yield

Mark the oxidation nos

Then

Gain of electron is reduction

Copper is reduced .

Option D

Answer:

=71.439911 u

Explanation:

We know that 1 mass of hydrogen atom = 1.00784 u

If it's measured at 72u: 72/1.00784=71.439911 u

Mass of 1 mol hydrogen atoms =1.00784u

Total mass in 72u

Answer:

.451 mole

Explanation:

PV = n RT     R = gas constany = .082057 L-Atm/K-mol      T is in units Kelvin

5 *2.32 = n (.082057)(40+273.15)

n=.451 mole

Organelles are the components of the cells with various functions and roles. The correct blanks are chloroplast, cell wall and vacuole, vacuoles, and mitochondria.

The organelles are the cell components that have well-defined structures and functions to perform the designated task in the cell activity. Chloroplast is the organelle that converts solar energy into chemical energy through photosynthesis.

The cell wall and the vacuoles provide the structural framework and shape of the cell. The vacuoles also store food pigments in the cell. The mitochondria of the cell convert the food source into energy like ATP.

Therefore, the correct blanks are chloroplast, cell wall and vacuole, vacuoles, and mitochondria.

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Answer:

methylhexane.

Explanation:

Because thats the answer.

Answer:

S

Explanation:

Using periodic table (see those little numbers in the upper right?  Those are electron 'shells' .... look at the bottom one)

Ca has 2     Cl has 7       Ne has 8        S  has 6 in the outermost shell

Answer:

in illustration 1

the mother told her son not to play with the boy having cough because it is a transferable disease which could cause him also to get sick and would get cough.

while in

illustration 2

the mother let the boy play with the boy having asthma because it is not a transferable disease which wold not affect him or any one else.

Explanation:

this is the reason

#1

#2

Answer: 19 grams

Explanation:

percent by mass = (mass of part)/(mass of whole) * 100

this means that in this question, 12 = x/160 * 100, where x is the amount of NaCl.

this means 12/100 = x/160, and thus x = (160)(12/100)=19.2 grams

The closest option is B.

Answer:

Second Option: 19 grams

Explanation:

Total solution weight: 160 grams

percent of NaCl in the solution: 12%

You take these two numbers and multiply them with 12 being over 100:

160 * [tex]\frac{12}{100}[/tex] = 19.2 grams

and then just round to the nearest whole number: 19 grams

Answer:

CoBr2

Explanation:

Hope it helps you :))))

have a good day

Answer:

E. O, S, Se, Te

Look up atomic size charts, go to row 6

Answer:

the car is slowing down l think so

Answer:

47

Explanation:

Propanal and acetone are the IUPAC names for the chemical.

Propanal, commonly known as propanaldehyde, is an aldehyde with one double bond and one oxygen atom.

Acetone is a ketone compound. R2CO is the functional group of ketones.

Thus, Propanal and acetone are the IUPAC names for the chemical.

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