(4.850 g - 2.34 g)/1.3 mL

Answer:

x

Explanation:

The qualitative data required can only be obtained from table X.

A questionnaire is a document that could be used to obtain the views of other people regarding a matter. The questionnaire serves the purpose of helping us to gather qualitative data.

In this case, the qualitative data that Prolly wants to gather is to find out  if males or females have a more negative attitude towards rodents. She has ensured that this is a confidential questionnaire.

Looking at the four tables as we can see them from the image that is attached to the question, the qualitative data required can only be obtained from table X.

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The pressure of 0.540 mol of an ideal gas at 35.5 L and 223K is 0.278atm.

The pressure of an ideal gas can be calculated by using the ideal gas law equation as follows:

PV = nRT

Where;

According to this question, 0.540 moles of an ideal gas contains a volume of 35.5 L and a temperature of 223K. The pressure can be calculated as follows:

P × 35.5 = 0.540 × 0.0821 × 223

35.5P = 9.886

P = 0.278atm

Therefore, the pressure of 0.540 mol of an ideal gas at 35.5 L and 223K is 0.278atm.

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Answer:

number of moles of NaSO4 =  [tex]\frac{mass of compound}{molar mass of compound}[/tex]

                                              =  [tex]\frac{35.9}{2(23) + 32 + 4(16)}[/tex]

                                              = 0.253 mol (3 s.f.)

0.253 mol = [tex]\frac{number of atoms}{avogadro's number}[/tex]

                 = [tex]\frac{number of atoms}{6.02(10^{23} )}[/tex]

thus, the number of atoms = 0.253 x [tex]6.02(10^{23})[/tex]

                                            = 1.52 × [tex]10^{23}[/tex]

Answer:

Outward pressure and inward gravity

Explanation:

Explanation:

need help in a question u stuck in??

a) 3.04 M

b) 11.5%

In an experiment ,25 ml of 3.7 molal of HCl, HCl solution has density of 1.20 g/ml and react with 10 g zinc to form zinc chloride and hydrogen gas was liberated.

From the above statement we have got a eqauation

Zn+2HCl → ZnCL2+H2

now from the equation , we have found that

2 moles of HCl gives 1 mole of zinc chloride

now:

a)  the molarity of HCl.

Here the density given, from it we can find the volume of HCl solution

d=m/v

v=m/d

v=36.5/1.20 = 30.4 ml

from the formula

M1V1=M2V2

here M stands for Molarity and V stands for Volume

M1=3.7M  V1 = 25ml

M2 = ?     V2 =  30.4 ml

Now put all the values in equation

M2 = M1×V1 ÷V2

M2 = 3.7×25÷30.4

M2 = 3.04 M

b) he percentage yield if 10.35 g of zinc chloride was obtained

now, from the above equation we know 2 moles of HCl gives 1 mole of zinc chloride

then,

% yield  of ZnCL2 = [tex]\frac{given mass }{molecular mass}[/tex] × 100

now puttin the values

% yield  of ZnCL2 = 10.35×100÷100.9

% yield  of ZnCL2=11.5%

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we can understand similarities and differences of elements and compounds through Venn diagram.

COMPOUND

ELEMENTS

SIMILARITIES:

This is how we can understand differences and similarities between elements and compounds through Venn diagram.

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The warmth of the air in the experiment conducted by Kate is the dependent variable.

In an experiment, the dependent variable is the variable that is measured or recorded by the experimenter.

On the other hand, the independent variable is the variable that is manipulated or changed by the experimenter.

According to this question, Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for an hour and then measured the warmth of the air in each box.

This suggests that the warmth of the air in the experiment conducted by Kate is the dependent variable.

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a. The statement "4s2 is the amount of energy in the atom" cannot be correct because 4s2 represents part of the electronic configuration of the atom.

b.

The electronic configuration of an atom is the spatial arrangement of atoms around the nucleus of the atom into orbitals and subshells.

The statement "4s2 is the amount of energy in the atom" cannot be correct because 4s2 represents part of the electronic configuration of the atom.

Also, the complete electronic configuration must start from a lower energy level.

An energy level is a level or position around the nucleus where atoms which have that amount of energy can be found.

So, statement "4s2 is the amount of energy in the atom" cannot be correct because 4s2 represents part of the electronic configuration of the atom.

In the term 4s2,

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The questions regarding matter and energy lab report (iced tea debate) (the salty soup debate) are answered below.

1. What phrase changes did you observe?

The liquid tea is transformed into a solid. This demonstrates that when the status of the tea is altered, no matter is lost.

The water in the soup evaporates and is converted to vapor in the lab's salty soup.

2. What kinds of energy transfers did you notice in each scenario?

In each of the cases, I observed an electrical unit transferring energy.

3. Identify an example of matter and energy conservation in the world around you.

The table is an illustration of the matter. The act of turning off the lights is an example of energy conservation.

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Answer:

4

Explanation:

oxygen has molar mass of 16 g/mol. 64 grams / 16 g/mol = 4mol

Answer:

Student A's Date was more precise.

Explanation: Her answers are closer together whereas student B's answers are further apart in numbers.

Answer: The answer is D  [tex]C_{2} OH_{6}[/tex]

Explanation: Because I just know by counting the letters to see how many of each one.

Answer:

C2OH6

Explanation:

The figure shows the presence of...

Two Carbon (C)

One Oxygen (O)

and Six Hydrogen (H)

We need to make sure we select the option that best represents all of the elements shown in the figure.

Because option 4: C2OH6 is the only chemical formula to include all the elements displayed, it is the best answer.

The number of hydrogen atoms in a molecule of adrenaline is 13 (option C).

Adrenaline is a hormone naturally produced in human body, however, it is a chemical compound made up of atoms of different elements.

The elements that make up a molecule of adrenaline are as follows:

According to this question, a structural configuration of adrenaline is attached. The number of atoms of the elemental constituent of adrenaline is given below:

Therefore, the number of hydrogen atoms in a molecule of adrenaline is 13.

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A gallon of iced tea containing 128 fl oz of iced tea contains 3.79 liters of the liquid.

The problem here has to do with converting from fl oz to liters.

Recall that:

1 fl oz = 29.6 mL

Thus:

128 fl oz = 29.6 x 128

                  = 3,788.8 mL

Also recall:

1 mL = 0.001 L

Thus:

3,788.8 L = 3,788.8 x 0.001

                 = 3.7888 L

In other words, a gallon of iced tea containing 128 fl oz of tea contains 3.79 liters of tea.

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Answer:

Capillary action :-the movement of liquid along a surface of a solid caused by the attraction of molecules of the liquid to the molecules of the solid

Capillaries/xylem:- narrow pipes take the water drops up through the roots of the tree

Transpiration pull :-helps to get water to the top of the tree

Answer:

air

Explanation:

The temperature to kelvin at 113°C is 386.15 K, at 37°C is 310.15 K and at 357°C is 630.15 K.

To find Kelvin use formula,

Kelvin = 273.15 + degree Celsius

So,

(a) The melting point of sulfur at 113 degree Celsius

   273.15 + 113 = 386.15 K

(b) The normal body temperature at 37 degree Celsius

  273.15 + 37 = 310.15 K

(c) The boiling point of mercury at 357 degree Celsius

  273.15 + 357 = 630.15 K

Temperature is a measure of hotness and coldness that can be expressed on a variety of scales, including Fahrenheit and Celsius. Temperature indicates the direction in which heat energy will flow from a hot body to a colder body to a lower temperature.

The total energy of the molecular motion inside the object is represented by the heat open object. Temperature is a measure of the thermal energy or average heat of a substance's molecules.

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Answer:

Explanation:

explaination is in attachment.

Answer:

The balloon fills and expands.

Explanation:

The balloon expands because of the carbon dioxide being made by the mixture. That's the chemical reaction.

Answer:

5.88235.10-7

Explanation:

Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The  the energy of orange lamp with a frequency of 5.10 x 10¹⁴ Hz is  3.40×10⁻¹⁹J.

Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave, light wave.

There is a relation between energy of wave. frequency of wave, and wavelength of wave

Mathematically,

E=hv

where,

E = energy of electromagnetic wave

h is planks constant having value 6.67×10⁻³⁴js

v is the frequency of electromagnetic wave =5.10 x 10^14 Hz

Substituting the given values

E= 6.67×10⁻³⁴js×5.10 x 10^14 Hz

E= 3.40×10⁻¹⁹J

Therefore, the energy of orange lamp with a frequency of 5.10 x 10¹⁴ Hz is  3.40×10⁻¹⁹J.

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The substance is ethylene glycol.

The term density is the ratio of mass to volume. We have two substances here which are ethanol and ethylene glycol. We have the mass of the solution as shown in the image in question 7 in the attachment to the question.

Mass of the solution = 381 - 250 = 131 g

Volume of the solution = 4 fl oz

1mL= 0.0338 fl

x = 4 fl oz

x =4 fl oz*  1mL/0.0338 fl oz

x = 118.34 mL

Density = mass/volume =  131 g/118.34 mL = 1.11 g/mL

The substance is ethylene glycol.

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Another arrow showing the heat coming from the sun will compete the diagram.

We know that evaporation occurs when the molecules that are at the surface of the liquid receive sufficient energy to escape from the attractive forces of the other molecules in the liquid.

We can see from the diagram that the molecules of water are moving upwards. The question now is, why are the molecules evaporating? The molecules of water are evaporating because of the heat from the sun thus another arrow showing the heat coming from the sun will compete the diagram.

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Answer:28, 34, 85, 6.6

Explanation:

The above observation is made as follows:

There is a bird circling right above where we sit. It appears to be a hawk. It has circled round our location five time each time being at least 25 meters above the ground. It is to be noted that the weather as at this time is sunny. and it is about noon. After the fifth time, it swoops down at a terrific speed of about 80 miles per hour. Then it snatches a lizard off the ground and flies off to a tree which is about 50 yards from where we are. As it flies off, the sounds of the wings beating against the air can be heard faintly.

Observation is the active gathering of information from primary sources. In living things, observation uses the senses. In science, observation can also involve capturing and recording data using scientific instruments.

Science relies heavily on observation. Scientists gather and record data through observation, which allows them to develop and test hypotheses and ideas.

Scientists observe in a variety of ways, using their own senses as well as instruments like microscopes, scanners, and transmitters to enhance their vision or hearing.

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Answer:

2

Explanation:

Scientists engage in peer reviews to avoid bias, Science is a blend of logic and innovation and Scientific ideas are not durable and cannot adjust to change as new data is collected. The correct options are 1,2, and 7.  

Peer reviews are used by scientists to ensure objectivity and reduce prejudice in their study. To create original ideas and hypotheses, scientists need both logical reasoning and creative thinking.

As scientists frequently interact, exchange ideas, and build on one another's work, it is a complex social endeavour. Understanding and making sense of the natural world is the central tenet of science.

Finally, scientists separate their personal beliefs from empirical evidence in order to stay as objective as possible in their research.

Thus, Scientists engage in peer reviews to avoid bias, Science is a blend of logic and innovation and Scientific ideas are not durable and cannot adjust to change as new data is collected. The correct options are 1,2, and 7.  

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5 tablets must be taken by the patient each day.

In a randomized clinical experiment with nursing home residents, the effects of equal oral vitamin D3 doses of 600 IU/day, 4200 IU/week, and 18,000 IU/month on vitamin D status were compared. The most efficient dosage was a daily dose, followed by a weekly dose and a monthly dose. It is believed that vitamin D status is affected equally by equivalent daily, weekly, or monthly doses of vitamin D3. A randomized clinical experiment including nursing home residents looked at this.

we know that for 1 day we need to divide 1.25 by 0.250

so, the answer will be 5 pills per day.

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Answer: Plain

Explanation: A plain is a large area of flat or gently rolling land.

I just took the test got it right your Answer is (PLAIN)