Element X has two isotopes. One has a mass of 45.0 amu and is 45.0% abundant. The other has a mass of 47.0 amu and is 55.0% abundant. What is the average atomic mass of element X?*
0 46.1 amu
O 36.5 amu
0 43.8 amu
0 48.9 amu

Explanation:

The next step in the scientific method is to analyze the data. Data analysis is the process of interpreting the meaning of the data we have collected, organized, and displayed in the form of a table or graph.

Answer:

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Answer:

Group 0

Explanation:

A cheerful teen willing to help,

stay salty,

stay positive...

The group zero of the periodic table is composed of inert gases.They are very unreactive So, they don't form molecules easily and are found as single atoms.

"Noble metals, such as gold, platinum, silver, and a few rare metals. Members of this class have little or no tendency to unite with oxygen in the free state and do not change composition when placed in water at a red heat.

Noble gas atoms already have complete outer shells and have no tendency to lose, gain, or share electrons. As a result, noble gases are inert and do not participate in chemical reactions.

Because their outermost shells are completely filled, zero group elements are inert. They have no tendency to lose, gain, or share electrons with other elements.

Thus, The group zero of the periodic table is composed of inert gases because they are unreactive.

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Answer:

sorry but can't understand your question properly

Answer:

To calculate half life, divide original value by 2.

1.

FOUR HALF LIVES = divide original value by 2, 4 times.

40÷ 2 = 20

20 ÷ 2 = 10

10 ÷ 2 = 5

5 ÷ 2 = 2.5g

2. AFTER TEN DAYS (TWO HALF LIVES)

140 ÷ 2 = 70

70÷ 2 = 35g

AFTER TWENTY DAYS (FOUR HALF LIVES)

140 ÷ 2 = 70

70 ÷ 2 = 35

35 ÷ 2 = 17.5

17.5 ÷ 2 = 8.75g

The vapor pressure of a liquid and the prevailing atmospheric pressure,

determines the boiling point temperature.

The vapor pressure of the acetone is the same in both containers because

the temperature is the same.

Reasons:

The vapor pressure of a liquid is the pressure at which the number of

molecules entering the gaseous phase are in (dynamic) equilibrium with

the number of molecules entering the liquid phase.

The factors that affect vapor pressure are;

Changing the surface area changes the instantaneous concentration of

molecules of vapor above the liquid, however, an equilibrium vapor

pressure is reached with time as more molecules enter or exits the liquid

(or solid) due being over or under saturated.

Therefore, the surface area of the liquid has no effect on a liquid's vapor

pressure therefore;

The vapor pressure in both containers will be the same because the temperature is the same.

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Answer:

Arsenic-tolerant GFAJ-1 bacteria were reported to have replaced some of the phosphorus (P) in their DNA with arsenic. ... These bacterial cells were very efficient at using the small amount of available phosphate in preference over the easily available arsenic. so yes.

Explanation:

hope this helps

Answer:

Yes

Explanation:

Hope everything goes well with your work :D

When trying to step into an argument or misunderstanding between people as a bystander with drugs and alcohol involved, the direct approach won't work.

Therefore, the direct approach won't work in the this scenario.

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Explanation:

whats the question. cause I didn't see it

Answer:

Monkey have tail we come from monkey

Answer:

The coccyx, or tailbone, is the remnant of a lost tail. ... The coccyx serves as an attachment site for tendons, ligaments, and muscles.  Tailbones helped our ancestors with mobility and balance

Explanation:

The sponge is unsaturated when it is taking in more water. It becomes saturated when it stops taking in water. It is supersaturated when water starts oozing out from the sponge.

A saturated solution contains just as much solute as it normally hold at a particular temperature. An unsaturated solution contains less solute than it can normally hold at a particular temperature. A supersaturated solution contains more solute than it can normally hold at a particular temperature.

We can use a sponge to model these three scenario as follows;

Water continues to enter into the sponge when it is unsaturated, this continues until the sponge becomes saturated with water and takes in no more water. When the sponge becomes supersaturated, water begins to ooze out from the sponge because it can no longer hold more water.

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Answer:

C:to the right side of the periodic table, and it is given

the suffix -ide.

Answer:

To hit someone on the head

Explanation:

self protection

The mass of ammonia that would be produced is 312.5 g

First, we will write a balanced chemical equation for the reaction

The balanced chemical equation for the reaction is

3H₂(g) + N₂(g) → 2NH₃(g)

This means

3 moles of hydrogen gas reacts with 1 mole of nitrogen gas to produce 2 moles of ammonia.

First, we will determine the number of moles of each reactant present

For Hydrogen (H₂)

Mass = 83.6 g

Molar mass = 2.016 g/mol

Using the formula

[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]

Number of moles of H₂ present = [tex]\frac{83.6}{2.016}[/tex]

∴ Number of moles of H₂ present = 41.468254 moles

For Nitrogen (N₂)

Mass = 257 grams

Molar mass = 28.0134 g/mol

∴ Number of moles of N₂ present = [tex]\frac{257}{28.0134}[/tex]

Number of moles of N₂ present = 9.174181 moles

Since,

3 moles of hydrogen gas reacts with 1 mole of nitrogen gas to produce 2 moles of ammonia

Then,

27.522543 moles of hydrogen gas will react with the 9.174181 moles of nitrogen gas to produce 18.348362 moles of ammonia

∴ 18.348362 moles of ammonia will be produced during the reaction

Now, for the mass of ammonia that would be produced

From the formula

Mass = Number of moles × Molar mass

Molar mass of ammonia = 17.031 g/mol

Mass of ammonia that would be produced = 18.348362 × 17.031

Mass of ammonia that would be produced = 312.49095 g

Mass of ammonia that would be produced ≅ 312.5 g

Hence, the mass of ammonia that would be produced is 312.5 g

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Wavelength = Speed of Light ÷ Frequency

                     = (2.99 × 10⁸ m/s) ÷ ( 2.45 × 10⁹ /s)

                     = 1.22 × 10⁻¹ m

The wavelength of a light of frequency   2.45 × 10⁹ /s is 1.22 × 10⁻¹ m.

Notes:

Hz ≡ /s

Answer:

i think the answer is C

Explanation:

if wrong im sorry

Answer:

I think #3 might be the answer .

Because in #1 atomic mass tells mass .

#4 Atomic number doesnot only tell about the electrons atom has

Hope you could get an idea from here.

Doubt clarification - use comment section.

The energy of a photon that has a frequency of 2.3 x 10¹⁴ Hz is 1.524 × 10-¹⁹J

HOW TO CALCULATE ENERGY OF A PHOTON:

E = hf

Where;

E = energy of photon (J)

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

f = frequency of photon (Hz)

E = 6.626 × 10-³⁴ × 2.3 × 10¹⁴

E = 15.24 × 10-³⁴+¹⁴

E = 15.24 × 10-²⁰J

E = 1.524 × 10-¹⁹J

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Answer:

The Answer Is False

Explanation:

I Just Think Thats The Answer

When there are lone pairs on the valence shell of the central atom in a molecule, the bond angle is decreased.

The shape of molecules depend on the number of electron pairs on the valence shell of the molecules. These electron pairs could be lone pairs or bond pairs. Lone pairs occupy more space around the central atom since it is attracted to only one nucleus compared to bond pairs which are attracted to two nuclei.

When lone pairs are present on the central atom in a molecule, they tend to "squeeze" the molecule thereby decreasing the bond angle in the molecule. Hence, presence of one or more lone pairs of electrons make the bond angles get smaller.

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Answer:

(A) Battery in a flashlight

Explanation:

Because the chemicals in the battery are being converted to light and heat energy from the bulb!

Answer: D

Explanatione: I hope this helped :)

The rate of diffusion change would increase if the PO₂ in the capillaries was 40 mmHg and the PO₂ in the muscle cell changed from 40 to 20 mmHg.

Simple diffusion is the movement of molecular substances from a region of higher concentration to lower concentration. The mechanism with which the movement of O₂ travels from the blood to the body tissues takes place with the use of simple diffusion.

Now, if PO₂ changes from 40 → 20 mmHg in the muscle cells, and the PO₂ in the blood = 40mmHg. It implies that the pressure gradient(P) has increased. As such, there is an increase in the rate of diffusion of oxygen from the blood to muscle cells.

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Answer:

ExplanationWhat are the properties of potassium?

Image result for give one other difference between the properties of copper and potassium

Potassium metal is soft and white with a silvery lustre, has a low melting point, and is a good conductor of heat and electricity. Potassium imparts a lavender colour to a flame, and its vapour is green. It is the seventh most abundant element in Earth's crust, constituting 2.6 percent of its mass.:

Difference between copper and potassium is the valence electron of sodium is in the 3s orbital whereas the valence electron of potassium is in the 4s orbital.

Potassium metal is soft and white with a silvery luster, has a low melting point, and is a good conductor of heat and electricity.

It is malleable, ductile, and an extremely good conductor of both heat and electricity. It is softer than zinc and can be polished to a bright finish.

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Answer:

yes gold is pure

Explanation:

Answer:

Hurricanes occur when ocean water warms during the spring, summer and early fall.

Explanation:

Warm air just above the water’s surface rises. The rising warm air creates a reduction in pressure at the surface, what meteorologists call a low-pressure area. Because nearby air is at a higher pressure, it will flow into the low-pressure zone.

https://www.sidmartinbio.org/how-does-a-high-pressure-system-affect-a-hurricane/

Answer:

Explanation:

Let's break it down:

We can now draw the structure of  2,2-dimethyl butane​ using the following steps:

Explanation:

atomic no. is 42

chemical symbol is Mo

no. of protons is 42

atomic mass is 95.95

no. of electrons is 42

no. of electron in outer most shell is 1

no of electrons in the n 3 shell is 18

no. of neutron is 96

The element molybdenum is 42nd element in periodic table with the symbol Mo and  a mass of 96. It have 42 electrons and 42 protons.

Molybdenum (Mo) is a transition metal in periodic table included in the d-block. The atomic number of molybdenum is 42 which is the number of protons and electrons in it.

The atomic number of a neutral atom is equal to the number of electrons in it. For a neutral atom the number of electrons and protons are equal and thus the number of both electrons and protons in Mo is 42.

Mass number is the sum of number protons and neutrons in an atom. The mass number of Mo is 96 and number of protons is 42. Thus, the number of neutrons is 96 -42 = 54.

The outer shells of Mo are 4d and 5s containing 4 and 2 electrons respectively. Thus the number of outer electrons is 6.The level n= 3 is M shell which contains 18 electrons for Mo.

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