Calculate the average atomic mass of lithium, which occurs as two isotopes that have the following atomic masses and abundances in nature: 6.017 amu, 7.30% and 7.018 amu, 92.70%.

Answer: 4.32g

Explanation:

MM of H2 = 1 x 2 = 2g/mol

2g of H2 contains 6.02x10^23 atoms.

Therefore Xg of H2 will contain 1.3 x 1024 atoms i.e

Xg of H2 = (2 x 1.3 x 1024) / 6.02x10^23 = 4.32g

Answer:

its b

Explanation:

Answer:

the answer to this question if dealing with biology should be;

Ww is an example of a Heterozygous allele

WW is an example of a Homozygous Dominant allele

ww is an example of a Homozygous recessive allele

Explanation:

this is due to the way scientists tend to write traits. this is the likely result of the box method of doing so

Ww is an example of a Heterozygous allele

WW is an example of a Homozygous Dominant allele

ww is an example of a Homozygous recessive allele

Explanation: This is due to the way scientists tend to write traits. this is the likely result of the box method.

The electron configuration for Boron (B) is given as [tex]1s^2 2s^2 2p^1[/tex] or [tex][He] 2s^2 2p^1[/tex]

Answer:

Boron (B) has an atomic number equal to 5 and is an element from Group 13 of the periodic table. It has a total of 5 electrons of which 3 are valence electrons.

The electron configuration for Boron can be written with the first two electrons in the 1s orbital. Since 1s orbital can hold only two electrons, out of the remaining three electrons; two electrons will go in the 2s orbital. The remaining one electron in the 2p orbital. Therefore the Boron electron configuration will be [tex]1s^2 2s^2 2p^1[/tex]

Since [tex]1s^2[/tex] is the electron configuration for Helium, Electron configuration for Boron can also be written as [tex][He] 2s^2 2p^1[/tex]

(Refer attached figure)

The tail of a comet is on the opposite side of the comet from the sun, due to the influence of the sun's radiation pressure and solar wind.

The tail of the comet is on the opposite side of the comet from the sun. This happens because the sun's radiation pressure and solar wind push material away from the comet's nucleus, forming a tail that points away from the sun, regardless of the direction the comet is moving. Therefore, the tail of the comet always lies opposite to the direction of the sun.

https://brainly.com/question/36721282

#SPJ2

Answer:

Option C

Explanation:

The answer to this question will be the third option "It is bendable." Malleable means to be able to change the shape of a object without damaging or breaking it. In this case a malleable solid would be for example drainage pipes. These pipes have curves and different shapes but still remain its product of a metal.

Hope this helps!

Final answer:

A malleable solid can be shaped under compression into thin sheets without breaking, a property typically found in metals, which also possess ductility, the ability to be drawn into wires.

Explanation:

If a solid is malleable, it means that it can be pounded into thin sheets or bent into shape without breaking. This property is commonly associated with metals, which are elements known for their ability to conduct electricity and heat, their shiny appearance, and their variable hardness and melting temperatures. At room temperature, metals are typically solid, with the well-known exception of mercury.

The ductility of a metal refers to its ability to be drawn into thin wires, and malleability refers to being shaped under compression, such as hammering or rolling into sheets. For instance, metals like copper are used in electrical wiring because they are both malleable and ductile; they don't break when being bent into the needed shapes and can be stretched into thin wires that conduct electricity efficiently.

Element 2 is more reactive than element 1 because element 2 does not have a fully filled valence shell, so it will attract electrons to complete it. Therefore, option (D) is correct.

Valence electrons are those electrons present in the outermost shell of an atom while the electrons occupied the inner shell are known as core electrons. Lewis structures can be useful to evaluate number of valence electrons and predict the nature of bonds.

Valence electrons are arranged in different types of shells and these electrons will decide the interaction between atoms and the formation of chemical bonds.

Only valence electrons present in the outermost shell can take part in the formation of a chemical bond or a molecule and are reason of the reactivity of the element such kind of electrons is called valence electrons.

Given, element 1 have electronic configuration of 2,8 while the electronic configuration of element 2 is given 2, 8, 18, 18, 6. Element 1 contains fully filled valence shell while element 2 has an incomplete valence shell of electrons. Therefore, element 2 will be more reactive to get nearednoblegas configuration.

Learn more about valence electrons, here:

https://brainly.com/question/18612412

#SPJ5

Answer:

675 joule

Explanation:

mass of the branch=15 kg

gravity=9. 8 m/s^2

height=4. 5 m

now,

potential energy=mass×gravity×height

=15kg ×9. 8 m/s^2 ×4. 5 m

=675 j

Answer: PE = 662 J

Explanation: Potential Energy is the product of mass, gravity and height.

PE = mgh

= 15 kg x 9.8 m/s² x 4.5 m

= 662 J

Answer:

The pressure of the gas will  "increases by a factor of four."

Explanation:

The absolute zero in other words called as the absolute temperature. Whereas the absolute zero is the least possible temperature. In which nothing will remain cold and no heat can be released or present in the substance. When it is described in the figure it will be, –273.15 degrees Celsius on the Celsius scale. and  0 K on the Kelvin scale. This absolute temperature concept has been raised from the third law of the thermodynamics.

Answer:

I think the answer is D a ray of violet light

Hope it helps!

Answer:

C

Explanation:

Cheese is rotten milk

Answer:

The answer is C, Cheddar Cheese

Answer:

                   Radon is the heaviest Noble Gas

Explanation:

                    This statement is very easy to be solved. As we know that Noble Gases are group of Elements which have complete valence shell and are stable elements and don't react easily and hence, are found in mono-atomic form in nature. These elements can be found on the extreme right of the periodic table in group 8 or group 18. Following are the Noble elements,

                             (i) Helium

                             (ii) Neon

                             (iii) Argon

                             (iv) Xenon

                             (v) Radon

Now,

In statement we are provided with only two noble gases i.e. Helium and Radon. Therefore, it is easy among them to finalize the heaviest one as Radon having atomic mass of 222.02 g/mol and atomic radii of 0.22 nm is much denser/heavier than Helium having atomic mass of 4.0 g/mol and atomic radii of 0.122 nm.

Answer:

The electron dot structure of [tex]Cl_2[/tex]

Explanation:

Step 1: First we have to know the number of valence electrons present in a molecule.

Chlorine is an element from group 17 with 7 nos. of valence electrons.

So, the given [tex]Cl_2[/tex] will have 7+7 = 14

Step 2: We, will begin by drawing the skeleton of the molecule.

Step 3: Then, we have to place the bonding pairs of the electrons in the middle atoms so that chemical bonds can be formed.

Step 4: The electrons left will be used as lone pairs for central and terminal atoms in order to achieve an octet and to finish the electron dot structure. The structural formula and electron dot structure has been attached below.

Answer: Protons = 13

Electrons= 10

Neutrons = 14

Explanation: This problem is an ion of Al which has a charge of +3

For this ion the atomic number for Al is 13 and its mass number is 27.

The atomic number indicates the number of protons which is 13. The number of electrons is changed due to loss of electrons since it was ionized. It loses 3 electrons so the total number of electrons is 13-3 = 10.

The number of neutrons can be calculated using

Atomic mass - atomic number

27- 13 = 14 neutrons

Aluminum ion (Al³⁺) has thirteen protons, thirteen protons, and ten electrons.

Aluminum ion (Al³⁺) is formed by the loss of three electrons from the neutral aluminum atom.

The neutral aluminum atom has thirteen protons, thirteen electrons, and thirteen protons.

During the formation of the Aluminum ion (Al³⁺), three electrons are removed from the valence shell of the neutral aluminum atom, leaving it with only ten electrons.

Learn more about Aluminum ion (Al³⁺) at: https://brainly.com/question/1542439

#SPJ6

Answer:

Yes

Explanation:

Sulfur in its pure do not have any taste and odor but many foods rich in sulfur can have a distinct odor and taste. The foods contains sulfur in very small amounts but some of the foods which are known for rich in sulfur are onion, garlic, egg, flex seeds, walnuts, meat, red bell pepper, cheese, green vegetables etc.

The foods rich in sulfur helps in fighting skin acne and fights skin infection which makes our skin brighter because of this property of sulfur it is used in skin antiseptic creme and medicines.

The intake of the excess sulfur can cause burning sensation, diarrhea, tonsils and even can cause brain damage if taken in too excess and death of the brain cells. So, the sulfur is good for health and is a remedy for our skin if taken by the natural source of food in a healthy amount.

Answer:

He is right, sulfured food dose taste different

The resonance structures of ozone differ only in the location of electrons in the structure.

The idea of resonance structures are invoked when a single structure does not sufficiently explain the bonding characteristics of a chemical species. The resonance structures show the different possible bonding extremes in the substance.

In the resonance structures of ozone, all the contributing structures only differ in the location of the electrons in the structure.

Learn more: https://brainly.com/question/8155254

Final answer:

The ozone molecule has resonance structures that differ by the location of electrons around the oxygen atoms, with the positions of the atoms remaining unchanged.

Explanation:

The resonance structures for ozone (O3) differ because they have electrons in different locations. Both structures have the same number of atoms and the same total number of electrons, which is 18. However, what changes between the resonance structures of ozone is the arrangement of these electrons around the oxygen atoms. The positions of the oxygen atoms remain unchanged. The use of double-headed arrows is common to illustrate that the two structures are resonance forms of the same molecule, indicating the shifting of electron locations without altering the atomic positions.

Answers:

a. Moles of oxygen formed: 0.670 mol

b. Moles of water formed: 1.34 mol

c. Mass of water formed: 24.1 g

d. Mass of oxygen formed: 21.4 g

Explanation:

Dihdyrogen dioxide is the chemical name for a compound made of two hydrogen atoms and two oxide atoms, i.e. H₂O₂, which is also known as hydrogen peroxide or oxygenated water.

The decomposition reaction of dihydrogen dioxide into water and oxygen gas is represented by the balanced chemical equation:

[tex]2H_2O_2(l)\rightarrow 2H_2O(l)+O_2(g)[/tex]

The mole ratios derived from that balanced chemical equation are:

a. Moles of oxygen formed

[tex]2\text{ mol }H_2O_2/1\text{ mol }O_2=1.34\text{ mol }H_2O_2/x[/tex]

When you solve for x, you get:

b. Moles of water formed

[tex]2\text{ mol }H_2O_2/2\text{ mol }H_2O=1.34\text{ mol }H_2O_2/x[/tex]

When you solve for x, you get:

c. Mass of water formed

Using the number of moles of water calculated in the part b., you calculate the mass of water formed, in grams, using the molar mass of water:

       ⇒ mass in grams = number of moles × molar mass

       ⇒ mass in grams = 1.34 mol × 18.015 g/mol = 24.1 g

d. Mass of oxygen formed

Using the number of moles of oxygen determined in the part a., you calculate the mass in grams using the molar mass of O₂.

Answer: the relative molecular mass of the compound

Explanation:

Answer: option C. 120°

Explanation:

Answer:

They’re correct it is 10 seconds

Explanation:

Answer: 10 seconds

Explanation:

Answer:

:Grassland

Explanation:

Explanation: Grasslands have too little water to support trees as it does not rain very often in more temperate Grasslands

Grasslands are the biome that receives insufficient water for tree growth, making them dominated by grasses instead of trees. Boreal forests, or taigas, are inaccurately described by the statement claiming they are dominated by deciduous trees, as they are in fact dominated by coniferous trees.

The grassland biome is characterized by receiving too little water to support the growth of large trees. In a grassland, the dominant vegetation consists of grasses which are adapted to environments with less precipitation. Unlike deciduous forests, which have moderate rainfall and temperatures to support tree growth, and taigas (boreal forests) and rainforests, which have significant precipitation that fosters dense tree growth, grasslands are more suited for grasses and herbaceous plants.

It's noteworthy that one of the statements about biomes might be false. Specifically, statement c. Boreal forests are dominated by deciduous trees is incorrect because boreal forests, also known as taiga, are actually dominated by coniferous trees, not deciduous trees.

Answer:

the answer is A

Explanation:

The chemical formula is C₂H₅OH and the correct answer is C

A Chemical Formula is used to identify the constituent atoms / elements present in the sample and also the proportion in which the elements are mixed.

In the above figure given it can be seen that the colour of the molecules are being used to determine the Type of molecule

It can be easily observed that in the unknown molecule the carbon atom is connected to another carbon atom

The first Carbon atom is connected to 3 Hydrogen atom

and the second Carbon atom is connected to 2 Hydrogen and one Oxygen atom , The oxygen atom is connected to one Hydrogen atom.

So the chemical formula is C₂H₅OH and the correct answer is C

To know more about Chemical Formula

https://brainly.com/question/11995171

#SPJ2

Answer:

Homogeneous mixture

Solution

Liquid-gas

Hope this helps, hope its not late.

Answer:

Homogeneous mixture

Solution

Liquid-gas

Explanation:

Standard Molar Volume is the volume occupied by one mole of any gas at STP. Remember that "STP" is Standard Temperature and Pressure. Standard temperature is 0 &176:C or 273 K. Standard pressure is 1 atmosphere or 760 mm Hg (also called "torr"). 1 mole of any gas at STP occupies 22.4 liters of volume.

Answer: 4.5 L

Explanation: Ideal gas at STP standard temperature and pressure: at STP

P = 1 atm

T = 1 °C convert to K (273 K)

Solution:

PV= nRT

Derive the equation to find V

V= nRT / P

Substitute the values

V= 0.2 moles x 0.082 L.atm/ mol. K x 273 K / 1 atm

Cancel out the units of moles, atm and K so the remaining uni is in L.

i. Mercury

ii. copper

iii. Mercury

iv.Nitrogen becomes a liquid at -200°C. Liquid nitrogen looks like water

Mercury is a liquid at 0°C, Copper is solid at 1000°C, Nitrogen is a gas at 500°C, and Nitrogen is a gas at -200°C.

(i) The element that is a liquid at 0°C is Mercury. It has a melting point of -39°C and a boiling point of 357°C, so it is in liquid state at 0°C.

(ii) The element that is a solid at 1000°C is Copper. It has a melting point of 1085°C, which means it remains in solid state at 1000°C.

(iii) The element that is a gas at 500°C is Nitrogen. It has a boiling point of -196°C, so it has already changed into a gas at 500°C.

(iv) Nitrogen at -200°C is in the gas state. Its boiling point is -196°C, which means it has already changed into a gas at -200°C.

https://brainly.com/question/24712140

#SPJ3

Question: A 14.630 g milk chocolate bar is found to contain 9.315 g of sugar

How many milligrams of sugar does the milk chocolate bar contain

Answer:

"9315 mg" of sugar has the milk chocolate bar

Explanation:

Given that the  14.630 g milk chocolate has  9.315 g of sugar

We have to convert 9.315 grams to milligrams

We know that 1 gram  =  1000 mg

So

9.315 gram =  [tex]9.315 \times 1000[/tex]

9.315 gram =  9315 mg                          

Therefore, the milk chocolate bar has 9315 mg of sugar.

Answer: option D. 3:1

Explanation:

the answer to this question is C 2:1

Explanation:

Mutations on DNA create genetic variation and diversity on which natural selection acts upon. Mutation can be advantageous, disadvantageous or neutral. Those mutations that confer advantage are preserved in the population while those that are DISadvantageous are weeded out. This occurs because advantageous traits that give a particular advantage to individuals in the environment, however slightest, give them an increased chance of survival and passing their genes to subsequent generations.

An example is mutation that causes sickle cell-shaped blood cells. Individuals with sickle cell blood are less likely to contract malaria. Therefore in an environment where malaria is endemic, the population will have a higher allele frequency for sickle cell alleles that populations in non-endemic areas.

Learn More:

For more on mutations check out;

https://brainly.com/question/11938701

https://brainly.com/question/13612138

#LearnWithBrainly

Answer:

5.41 x 10²² g

Explanation:

Data Given:

no. of moles of sodium = 2.35 x 10²¹ moles

mass of sodium = ?

Solution:

Formula used

         no. of moles = mass in grams / molar mass

To find mass rearrange the above equation:

   mass in grams = no. of moles x molar mass. . . . . . (1)

Put values in equation 1

          mass in grams = 2.35 x 10²¹ moles x 23 g/mol

          mass in grams =  5.41 x 10²² g

So,

mass of Sodium (Na) =  5.41 x 10²² g

Answer:

1) mass ZnO = 55.155 g

2) V SO2(g) = 18.289 L

Explanation:

1) Zn + H2O  → ZnO + H2

∴ mass Zn = 41.6 g

∴ mm Zn = 65.38 g/mol

⇒ mol Zn = (41.6 g)(mol/61.38 g) = 0.678 mol Zn

⇒ mol ZnO = (0.678 mol Zn)(mol ZnO/mol Zn) = 0.678 mol ZnO

∴ mm ZnO = 81.38 g/mol

⇒ mass ZnO = (0.678 mol ZnO)(81.38 g/mol) = 55.155 g ZnO

2) S(s)  + O2(g)  →  SO2(g)

∴ mass S(s) = 24 g

∴ T = 25°C ≅ 298 K

∴ P = 1 atm

∴ mm S(s) = 32.065 g/mol

⇒ mol S(s) = (24 g)(mol/32.065 g) = 0.7485 mol S(s)

⇒ mol SO2(g) = (0.7485 mol S(s))(mol SO2(g)/mol S(s)) = 0.7485 mol SO2(g)

ideal gas:

⇒ V SO2(g) = ((0.082 atm.L/K.mol)(298 K)(0.7485 mol))/(1 atm)

⇒ V SO2(g) = 18.289 L SO2(g)