chemical element that has atomic number less than 58 and atomic mass greater than 135.6

The abundance(amount) of each isotope determines the relative atomic mass.

The relative atomic mass refers to the mass of the atom that is obtained by adding together the products of the relative atomic masses of each isotope and the relative abundance of the isotope.

Hence, we can say that, since the relative atomic mass takes into account the masses and percentage abundance of all the isotopes, it then follows that the abundance(amount) of each isotope determines the relative atomic mass.

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Answer: Internalized Crystal Structure

Explanation:

"The exact and unique arrangement of atoms, ions or ionic groups is the characteristic feature of each crystallized mineral."

- S.K. Haldar & Josip Tisljar, authors of Mineralogy and Petrology

A mineral's unique and specific crystal structure determines the physical properties such as color, hardness, density, luster, crystal form, cleavage and fracture.

There is a double bond between the carbon atoms and a lone pair on oxygen.

The term Lewis structure has to do with the structure that shows the arrangement of atoms in a compound. It is normal that the structure would be composed of the symbols of the elements and the bonds that they form as dots or sometimes as a single line to show shared electrons.

Now we can see that the compound C2H2O is a compound that contains a double bond between the carbon atoms. There is a lone pair of electron that resides on the oxygen atom. The structure of this compound is shown in the image attached.

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Correct hypothesis is 'i will place three rats in three separate cages and

expose them to varying amounts of cigarette smoke'

Here given statement C is correct in hypothesis because when we place three rats in three separate cages and expose them to varying amounts of cigarette smoke then 50% rat are kill because nicotine concentration in the mainstream smoke particulate matter of reference cigarettes are 70%-8% and it take 20 min to kill the rats

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0.8mole/L is concentration of N2O5.

As the reaction is first order ,

so the order with respect to N2O5 is 1.

general,

Rate of equation is written as

rate = k [N2O5]^1

k is the rate constant = 3 * 10 ^ - 5 * S ^ - 1

rate = 2.4*10^-5 mole/L

N2O5 is concentration term

2.4*10^-5 mole/L  = 3 * 10 ^ - 5 * S ^ - 1 [  N2O5]

 N2O5 = [0.8 mole/L]

=0.8mole/L

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The number of mole of Cr in 1 mole of Cr₈(PO₄)₃ is 8.00 moles

From the formula of the compound, Cr₈(PO₄)₃, the following were obtained:

From the formula, we can see that 8 moles of Cr are present.

Thus, 1 mole of Cr₈(PO₄)₃ will contain = 1 × 8 = 8.00 moles of Cr

Therefore, we can conclude that 1 mole of Cr₈(PO₄)₃ contains 8.00 moles of Cr

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The lines are violet and blue respectively.

We know that the energy of the photon could be obtained by the use of the equation;

E = hf

E = energy

h = Plank's constant

f = frequency

For the first line;

E = 6.6 * 10^-34 Js * 3.45 x 10^14 Hz = 2.3 * 10^-19 J

Given that;

E = hc/λ

λ = hc/E

λ = 6.6 * 10^-34 * 3 * 10^8/2.3 * 10^-19

λ = 8.61 * 10^-7 m or 861 nm

The color is violet

For the second line;

E = 6.6 * 10^-34 Js * 6.53 xx 10^14 Hz

E = 4.3 * 10^-19 J

E = hc/λ

λ = hc/E

λ =  6.6 * 10^-34 * 3 * 10^8/4.3 * 10^-19

λ = 4.60 * 10^- 7 m or 460 nm

The color is blue

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The number of mole of tin (Sn) that you have is 0.058 mole

6.02×10²³ atoms = 1 mole of tin (Sn)

With the above information, we can obtain the number of mole ot tin. Details below

We can obtain the number of mole of tin as follow:

6.02×10²³ atoms = 1 mole of tin (Sn)

Therefore,

3.5×10²² atoms = (3.5×10²² atoms × 1 mole) / 6.02×10²³ atoms

3.5×10²² atoms = 0.058 mole of tin (Sn)

Thus, the number of mole of tin (Sn) you have is 0.058 mole

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no. of moles in uncut diamond are 13.11 mol and number of Carbon atoms are 78.94 × 10^23.

The mass of a substance is given in this case. We are aware that the diamond is Carbon's allotrope.

weight of diamond before cutting = 787 carats

1 carat. = 0.200 gram

therefore, 787 carats. = 787 × 0.200

= 157.4 gram

To calculate the number of moles equation is

Number of moles =Mass / Molar mass

Molar mass of carbon Is 12g/mol

therefore, no. of moles = 157.4 / 12 = 13.11 mol

We know that 1 mol of any substance contains 6.022×10^23 atoms.

Here we have 13.11 mol of carbon. thus,

No. of Carbon atoms = 13.11 × (6.022×10^23 / 1 mol) = 78.94 × 10^23

Thus, 13.11 mol of diamond contain 78.94 × 10^23 number of Carbon atoms.

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The correct answer for  volume would the krypton occupy are 29.8 mL , 5375 mL , 6.5 * 10^ 5 mL .

We can solve this problem by using Boyle's Law, which states that:

"For a fixed mass of an ideal gas kept at constant temperature, the pressure

of the gas is inversely proportional to its volume"

Mathematically:

pV = const. where

p is the pressure of the gas

V is its volume

We can rewrite the formula as

PiVi = P2V2

For the gas in this problem:

P=0.400atm is the initial pressure

Vi 75.0mL is the initial volume

765mm Hg 1.006am is the final pressure (using the conversion factor

1atm = 760atm )

Solving for V2, we find the final volume:

V 2 =p1vi/ p2 =(0.400) (75.0)/ 1.006 = 29.8mL

We can solve this part by using again the equation:

Where in this case we have:

p 1= 0.400at is the initial pressure

V_{1} = 75mL is the initial volume

p_{2} = 4, nm*H_{0} is the final pressure

Converting into atmospheres,

p_{2} = 4 Hg 7mm/d -0.00536m

And solving for V2, we find the final volume:

V_{2} = (p_{1}*V_{1})/p_{2} = ((0.4)(75))/0.0056 = 5357mL

e)

As before, we use Boyles' Law:

p{1}*V{1} = p{2}*V{2}

In this part we have:

p{1} = 0.4atm is the initial pressure of the gas

V{1} = 75mL is the initial volume of the gas

p{2} = 3.5 * 10 ^ - 2   torr

1 torr is equivalent to 1 mmHg, so the conversion factor is the same as before.

therefore the final pressure in atmospheres is:

p2=3.50 *10^-2 2mm Hg 760mmHg/atm 4.6-10-atm

And so, the final volume of the krypton gas is:

V{2} = (p{1}V{1})/p{2} = ((0.4)(75))/(4.6 * 10 ^ - 5) = 6.5 * 10 ^ 5 * mL.

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The density of air is 1.29 grams/Litre. The weight, in kilograms of a cubic meter (1.00 m^3) of air is  1.29 kg

Humid air's density can be calculated by treating it as a mixture of ideal gases. The vapour pressure is the partial pressure of water vapour in this case. In the temperature range of 10 °C to 50 °C, the density calculation error is less than 0.2% using this method.

given that

Density =mass/ volume

1.29grams/ liter =[tex]\frac{mass}{m^{3} }[/tex]

1 liter = 0.001 [tex]m^{3}[/tex]   and 1 kilogram = 0.001grams

0.00129 kg/[tex]m^{3}[/tex] = mass / 0.001 [tex]m^{3}[/tex]

mass =0.00129 kg/[tex]m^{3}[/tex] /0.001 [tex]m^{3}[/tex]

which means,

mass= 1.29 kg

The density of air is 1.29 grams/Litre. The weight, in kilograms of a cubic meter (1.00 m^3) of air is 1.29 kg

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Dimensions of a table and recorded the length as 103.50 cm and the width

as 73.75 cm

AREA = L × B

AREA = 103.50 × 73.75

area = 7,633.125 cm²

but the student should report 7633 cm² because the width measurement (73.75 cm) has 4 significant figures while the length measurement (103.50 cm) has 5 significant figures and when multiplying the answer should have the same number of significant figures as the number with the least number of sig figs.

so the correct answer should be 7633 cm².

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Answer:

0.4773 moles Ca

Explanation:

To find the amount of moles, you need to multiply the mass (g) by the atomic mass of calcium. The atomic mass compares the mass of calcium per every one mole. It is important to arrange the ratio in a way that allows for the cancellation of units (grams should be in the denominator). The final answer should have 4 sig figs to match the given value.

Atomic Mass (Ca): 40.078 g/mol

 19.13 g Ca              1 mole
-------------------  x  -------------------  =  0.4773 moles Ca
                              40.078 g

Answer:

A.

Explanation:

Spiders are creepy.

That your answer.

The rock would weigh 2.89 grams per milliliter.

It is the mass of anything or body per unit volume of that specific object or body.

Equals volume / mass

A graduated cylinder has a mass of 50g when empty, as stated in the problem. The graduated cylinder has a mass of 120g after 30 mL of water have been added.

The rock weighs 250 grams, or 130 grams.

the rock's volume is equal to 75 milliliters minus 30 milliliters, or 45 milliliters.

Mass of the rock divided by volume equals 2.89 grams per milliliter, which is the density of the rock.

As a result, the rock has a density of 2.89 grams per milliliter.

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The correct option is (d) ,i.e., the acorn squash yield lessen from 2012 to 2013 due to lower temperatures.

To estimate yield of vegetables in a harmonious manner, one can gather 10' of row at several locales in the field. Multiply the average yield( lb) per 10' of row times the following row distance factors to convert the sample of yields of vegetables to lb/A.

The question is incomplete the given questions is a multiple choice question :

The data table shows the yield of vegetables in a garden of the school for 3 years. The yield is the number of pounds of vegetables gathered. The same number of each type of vegetable was planted every time. Which statement is an inference?

a. the onion yield was higher than the beet yield in 2013

b. the butternut squash yield lessened from 2011-2012

c. the spinach yield was 102 pounds in 2011 and 137 pounds in 2012

d. the acorn squash yield lessen from 2012 to 2013 due to lower temperatures

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The valence shell of an atom if completed octet or the maximum number of electrons it can fill then it will be stable. Helium is not reactive because it is highly stable and its valence shell is fully filled.

Helium, is the second element in the periodic positioned in the noble gas group. It have an electronic configuration of K=2. The only orbital it have is K and it is completely filled. That's why it is stable.

According to quantum mechanical model of atom, each orbital have a certain capacity to accommodate electrons and an orbital is considered as a wavefunction.

When the valence orbitals fulfill the electrons, then the atom is no longer need an electron or never donate from the completely filled state. Hence it becomes unreactive.

The valence shell of hydrogen and lithium is not completely filled and they are reactive to gain electron to attain stability. Therefore, helium is unreactive because of its stability.

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Answer:

Electronegativity is the ability of an atom to attract the shared pair of electrons towards itself *in a molecule*

The heat capacity of the calorimeter is 16.8 J/K.

Now we know that the calorimeter is a device from which there is no heat loss or gain. In this case, the heat lost by the hot water is equal to the heat gained by the calorimeter.

Thus;

cwθ = ccθ

Where;

cc= heat capacity of the calorimeter

cw = heat capacity of water

θ == temperature change

Hence;

4.2  * (37 - 25) = cc (25 - 22)

cc = 4.2  * (37 - 25)/(25 - 22)

cc = 16.8 J/K

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The volume in milliliter of 7.44 g of acetone 9.4897 mL

It is necessary to understand a substance's mass, volume, and density in order to answer this question. By dividing a material's mass by volume, the density of the substance may be calculated. The equation for density may now be written in mathematical form using the expression for density, and the equation for mass can be produced by rearrangement using the equation for density as a starting point.

Mass of acetone = 7.44 g (given)

Volume of acetone (v) =  mass of acetone ÷ density of acetone

V = 7.44 g ÷ 0.784 g/mL

V = 9.4897 mL

Hence volume of acetone = 9.4897 mL

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2.507 moles of water is present in 1.51 x 10^24 molecules of water

The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12

Every mole contain a certain number of atoms which is the Avogadro's number

Avogadro's number states that each mole of every compound contains

6.023x 10^23 atoms of molecules

It is given to us to find out how many moles of water is present in 1.51 x 10^24

The number of  moles of water present = 1.51 x 10^24 / 6.023 x 10^23

                                                                   =2.507 moles

Hence, 2.507 moles of water is present in 1.51 x 10^24 molecules of water

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The correct answer is The mass ratio of S to O in SO divided by the mass ratio of S to O in SO2 is 2 :1.

When two elements can combine to form two or more different compounds, the mass of one element compared to the fixed mass of the other will always be in a ratio of small whole numbers.

As we all know,

Oxygen mass = 16 g

Sulfur mass = 32 g

Sulfur mass in SO = 32 g

The mass of oxygen in SO is 16 g.

Sulfur to oxygen mass ratio in SO =..... (1)

Sulfur mass in SO2 = 32 g

Oxygen mass in SO2 = (2 16)g = 32 g

Sulfur to oxygen mass ratio in SO2 =..... (1)

The S/O ratio in SO is 2: 1.

The S/O ratio in SO2 is 1: 1.

Taking the ratios 1 and 2, we get:

the mass ratio of S to O in SO to mass ratio of S to O in SO2 is 2 : 1

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A typical aspirin tablet contains 321 mg of the active ingredient acetylsalicylic acid and 321 mg makes 0.321 g.

The nonsteroidal anti-inflammatory medicine (NSAID) aspirin, often referred to as acetylsalicylic acid (ASA), is used to treat a variety of inflammatory disorders by lowering pain, fever, and/or inflammation. These conditions include Kawasaki disease, pericarditis, and rheumatic fever.

Long-term usage of aspirin is also used to help those at high risk avoid further heart attacks, ischemic strokes, and blood clots. Effects of pain or fever often start within 30 minutes. Aspirin functions similarly to other NSAIDs but also inhibits platelet function.

Your doctor should be consulted when deciding whether or not to take aspirin because it depends on your cardiovascular risk, according to Wong. While aspirin is often taken safely by many people, it can also result in life-threatening stomach, intestinal, and brain bleeding.

1 mg = 1/1000 g

so,

321 mg = 321/ 1000g

            = 0.321g

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Light travels as a "wave" and interacts with matter as a "particle".

Electromagnetic radiation that the human eye can detect as light. From radio waves with wavelengths measured in metres to gamma rays with wavelengths shorter than roughly 1 1011 metres, electromagnetic radiation occurs throughout a very broad range of wavelengths. The wavelengths of light that are visible to humans fall into a very small range within that wide spectrum, ranging from about 700 nanometers (nm; billionths of a metre) for the red light to roughly 400 nm for violet light.

Infrared and ultraviolet are two spectral bands that are close to the visible band and are frequently referred to as light as well. A fundamental physics constant, the speed of light in a vacuum is currently accepted to be 299,792,458 metres per second.

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Answer:

comparative

Explanation:

The massage just pop on the ipod

Answer:

Empirical Formula = Al3O4 .

Explanation:

Mass of Aluminium = 0.3000 g

Mass of Oxygen in oxide = 0.5333 g - 0.3000 g = 0.2333 g

Moles of Aluminium = Mass / MOlar Mass = 0.3000 g / 27 g = 0.01112 moles

Moles of Oxygen = Mass / Molar Mass =0.2333 g / 16 g = 0.01458 moles

Now we will divide each of the molar quantities by the smallest number of moles.

Aluminium : 0.01112 moles / 0.01112 moles = 1

Oxygen : 0.01458 moles/ 0.01112 moles =1.31

Since, the ratio between Al and O is 1:1.31 which is not the smallest whole numebr ratio. SO, we will multiply it by the smallest number to get whole number ratios.

So, Here on multiplying the ratio by 3 ,we get Al : O = 3:4.

The experimental empirical formula of the aluminum oxide is Al₂O₃.

To determine the empirical formula of the aluminum oxide, we need to calculate the mole ratios of aluminum (Al) and oxygen (O) based on the given masses.

Convert the masses of aluminum and aluminum oxide to moles:

Determine the mole ratio of Al to Al₂O₃:

Simplify the mole ratio to obtain the empirical formula:

It is important to note that the given experimental data and the resulting empirical formula are based on the assumption that the reaction went to completion and that the measurements were accurate. Further confirmation and analysis, such as using additional experimental techniques or calculations, may be necessary to verify the empirical formula.

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The  milligrams of propanol should be given for each dose is 101.25 mg.

We know that drug is a chemical that is taken into the body to achieve a particular end which is to stop sickness. The amount at which drug should be given is called the dose of the drug.

The mass of the patient is 75 pounds we have to convert this weight to kilograms.

1 pound = 0.45 Kg

75 pounds = 75 pounds * 0.45 Kg/1 pound

= 33.75 Kg

If the dose is 3 mg per kilogram then;

3 mg should be given for 1 kilogram of body mass

x mg should be given for 33.75 Kg of body mass

x = 3 mg  * 33.75 Kg / 1 kilogram

= 101.25 mg

Hence, milligrams of propanol should be given for each dose is 101.25 mg.

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A "fuzzy cloud" around the nucleus of an atom where an electron is likely to be found will be called an orbital. Option A.

Orbitals are regions within the atom where electrons can be found.

A typical electron contains electrons that are negatively charged, protons that are positively charged, and neutrons that have no charges.

The positively charged protons and neutral neutrons form the core or the nucleus of the atom. The electrons, on the other hand, are located outside the nucleus.

The regions where electrons of atoms are located are collectively called orbitals.

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Answer: my answer would be a

Explanation: so i did some research and all of it came up with the answer (A).

Answer:

The answer is

Explanation:

by studying the matter and its parts and also discovering the wonders of our earth