The percent composition of carbon in acrylonitrile is
a 5.690%
b 67.89%
С
47.90%
d 22.646%

The average atomic mass of Ca : 43.943 amu

Given

Isotopes of Ca

Required

The average atomic mass

Solution

Isotopes are elements that have the same Atomic Number (Proton)

Atomic mass is the average atomic mass of all its isotopes

Avg atomic mass = m1.%m1 + m2.%m2....mn.%mn

m1 = isotope 1

m2 = isotope 2

% = abundance of the elements in nature

Input the value :

avg atomic mass = 39.96 x 0.96941 + 41.96 x 0.0647+42.96 x 0.0135 + 43.96 x 0.02086 + 47.95 x 0.0187

avg atomic mass =43.943 amu

Answer:

Percent composition is calculated from a molecular formula by dividing the mass of a single element in one mole of a compound by the mass of one mole of the entire compound. This value is presented as a percentage.

Explanation:

Answer:

Apollo 11 made a capsule landing

Explanation:

Answer: i don’t know what type of landing you mean

Explanation:

They did a lunar landing then reentry and then capsule landing.

Answer:

jolly ranchers

Explanation: yes

Answer:

Explanation:

The reaction expression is given as:

           ⁴⁰₁₈ Ar   →   X  +  ⁰₁B  

To solve this problem, we must bear in mind that both mass number and atomic number must be conserved.

 So;

For the mass number:

               40  = A + 0

                 A  = 40

For atomic number:

                 18  = Z + 1

                  Z = 18 - 1  = 17

An atom is identifiable by the atomic number. Since the atomic number of X is 17 then it is Cl, chlorine

Answer:

The answer is A.Digital waves can be copied without damaging the audio signal, whereas analog waves cannot

Explanation:

I took AP EX quiz.

Answer:

Oxygen receives two electrons from magnesium.

Explanation:

Hello!

In this case, considering the chemical reaction by which magnesium oxide is produced:

[tex]2Mg+O_2\rightarrow 2MgO[/tex]

In that case, if we show up the oxidation states, we have:

[tex]2Mg^0+O_2\rightarrow 2Mg^{2+}O^{2-}[/tex]

In such a way, since metals, like magnesium, have the capacity to lose electrons, rather than receive them, we infer why it turns out with +2 rather than -2; thus, we the correct answer is "oxygen receives two electrons from magnesium." because it results with -2 in MgO.

Best regards!

Answer:

Oxygen receives two electrons from magnesium.

Explanation:

Answer:B and A

Explanation:

i think

Answer:

42 km/h

Explanation:

Answer:

See explanation

Explanation:

Manganese is a transition element. All transition elements have incompletely filled d orbitals which ultimately makes them to exhibit a variable oxidation state.

Manganese has electronic configuration of [Ar]4s23d5. This means that two electrons could be lost from the s orbital to yield Mn^2+. Also, two electrons could be lost from both s and d orbitals to yield Mn^4+

Answer:

C.

Explanation:

Answer:

Explanation:

I'm not sure, don't hate me if i'm wrong but i think the third one is the answer.

Answer:

The question is asking what does not have anything to do with the bond formation.

Answer:

Mass = 114.5 g

Explanation:

Given data:

Mass of zinc = 55 g

Mass of ZnCl₂ produced = ?

Solution:

Chemical equation:

Zn + 2HCl     →      ZnCl₂ + H₂

Number of moles of Zn:

Number of moles = mass/molar mass

Molar mass of Zn = 65.4 g/mol

Number of moles = 55 g/  65.4 g/mol

Number of moles = 0.84 mol

Now we will compare the moles of Zn and zinc chloride,

               Zn           :          ZnCl₂

                1             :           1

              0.84        :          0.84

Mass of ZnCl₂:

Mass = number of moles × molar mass

Molar mass of ZnCl₂= 136.3 g/mol

Mass =  0.84 mol × 136.3 g/mol

Mass = 114.5 g

Answer:

Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out.

Explanation:

Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out.

Answer:

photosynthesis

Explanation:

that's the way plants feed themselves

Answer:

photosynthesis

Explanation:

I hope i helped

Answer:

Because dipole - dipole force is stronger than london dispersion force

Explanation:

Intermolecular forces determines a wide range of physical properties of matter of which melting point is one of them.

Both london dispersion forces and dipole- dipole forces are vanderwaals force.

But diople - dipole forces exists between polar molecules which are molecules with permanent dipoles.

In london dispersion forces the dipole is temporary

Answer:

An open system is a system that has external interactions. An open system is contrasted with the concept of an isolated system which exchanges neither energy, matter, nor information with its environment. An open system is also known as a flow system.

Answer:

It's big brain time

Explanation:

Weathering is the process of breaking rocks into sediment while erosion is the process that wears away this sediment and other materials and moves them from one location to another.  Agents of erosion include gravity, glaciers, wind, and water.  Erosion only occurs when these agents have enough energy.  The moment agents of erosion lose their energy and momentum they deposit their load.  This process is known as deposition.  The load is what the agent is carrying.  As agents of weathering lose their energy, the heavier sediment is dropped.  As the energy is lost, gravel, then sand, then silt, and then clay are deposited, due to their respective masses.

Mass movement, sometimes referred to as mass wasting, is what we call the movement of surface material due to gravity, water, wind, and ice.  There are five main types of mass movements: falls, creep, flows, slides, and slump.

Answer:

I am pretty sure its called a sand dune

Explanation:

Answer:

B

Explanation:

When water is at the surface of the ground, it evaporates and goes back to the clouds for which causes it to rain therefore returning water back.

Answer:

21.25

Explanation:

Answer:

C. It received genes that are exactly the same as the parent's genes

In asexual reproduction in hydra,offspring has no genetic variation from the parent because it received genes that are exactly the same as the parent's genes.

Asexual reproduction is a type of reproduction where the offsprings are  not produced by the combination of genetic material of two individuals which are of different sexes rather they are produced by a single parent.

It is the  not the dominant form of reproduction in living beings.Here, the offsprings are identical to their parents as there is no recombination of genetic material.It is observed in both unicellular or multicellular organisms.

There is no fertilization or gamete formation taking place.Types of asexual reproduction include budding, binary fission,fragmentation,etc.

Learn more about asexual reproduction,here:

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The number of Al atoms is greater than the number of Sn atoms

Given

20 gram sample of Tin and Aluminum

Required

Number of atoms

Solution

1 mol = 6.02 x 10²³ particles (atoms, molecules, ions)

So the number of atoms of each element is determined by the number of moles. The greater the number of moles the greater the number of atoms

mol = mass : Ar

mol = 20 : 118,71 u

mol = 0.168

mol = 20 : 26.9815 u

mol = 0.741

So the number of Al atoms > number of Sn atoms

Answer: Conduction, radiation and convection all play a role in moving heat between Earth's surface and the atmosphere. Since air is a poor conductor, most energy transfer by conduction occurs right near Earth's surface. ... During the day, sunlight heats the ground, which in turn heats the air directly above it via conduction.

HOPE THIS HELPS

The statement information about earth and the sun direction of earth's rotation axis best explains the pattern of daytime and night-time on earth is " earth must complete one rotation on its axis every 24 hours".

The sun was composed of incredibly hot gases, as well as then it heats as well as illuminates the entire solar system.

The earth was referred to as a "one-of-a-kind" planet since that is the only one on the planet with ideal circumstances for life.

Day though night are caused by the Earth's diurnal revolution. From west to east, the earth rotates on its axis for around 24 hours. As a result, the sun appears to rotate from east to west, resulting in sunset and sunrise. except for polar is, which remains stationary in the north polar sky along the earth's axis, all those other stars move from east to west.

Therefore, the correct answer will be C.

To know more about earth and sun.

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Answer:

THE ANSWER IS (C.)

Explanation: