Which material is the medium of ocean waves?
A. Sand
B. Air
C. Rock
D. Water

Answer:

5 000 000 (5 million atoms)

Explanation:

Let us assume that a vanadium atom has a spherical shape.

diameter of a sphere = 2 x radius of the sphere

Thus,

Radius of a vanadium atom = 130 pm

                                              = 130 x [tex]10^{-12}[/tex] m

The diameter of a vanadium atom = 2 x radius

                                                         = 2 x 130 x [tex]10^{-12}[/tex]

                                               = 260 x [tex]10^{-12}[/tex] m

Given a distance of 1.30 mm = 1.30 x [tex]10^{-3}[/tex] m,

The number of vanadium atoms required to span the distance = [tex]\frac{1.3*10^{-3} }{260*10^{-12} }[/tex]

                                                  = 5000000

Therefore, the number of vanadium atom that would span a distance of 1.30 mm is 5 million.

Answer:

(2.68 x 10^22 atoms) x (238 g U / 6.022 x 10^23 atoms) = 10.59 g of U.

The number least significant figures in the multiplication and division problem is 3 significant figures (2.68). So, following significant figure rules for multiplication, your answer should have 3 significant figures.

The final answer is: 10.6 g U

Explanation:

Hopefully this helps :)

Answer:

[2] Na + [2] H2O ➖ [2] NaOH + [ ] H2

Hope it will help :)

Answer:

2, 2, 2, and 1

Explanation:

I put that in and it was correct.

Answer:

Calculate from Oxidation Number

The oxidation number of oxygen is -2, and the oxidation number of hydrogen is +1. Add together the oxidation numbers of all the atoms in the polyatomic ion. In the example, -2 +1 = -1. This is the charge on the polyatomic ion.

Answer:

Explanation:

Now, you know that this solution has a molarity of 6.00 M, which basically means that every liter, which is the equivalent of 1000 mL, will contain 6.00 moles of ammonia. Since we've picked a sample of 1000 mL, you can say that it will contain 6.00 moles of ammonia. To convert this to grams, use the compound's molar mass

Answer:

2.74 x 1023 molecules of CO2.

Explanation:

There are 2.74 x 1023 molecules of CO2.

Answer:

The relationship of the speed of sound, its frequency, and wavelength is the same as for all waves: vw = fλ, where vw is the speed of sound, f is its frequency, and λ is its wavelength. ... The more rigid (or less compressible) the medium, the faster the speed of sound

Explanation:

Answer:

The speed of sound can change when sound travels from one medium to another. However, the frequency usually remains the same because it is like a driven oscillation and has the frequency of the original source. If vw changes and f remains the same, then the wavelength λ must change.

Answer: The answer is D :)

Explanation:

Answer:

D

Explanation:

Answer:

Single Replacement

Explanation:

Single Replacement reactions are A + BX = AX + B. It's easy to tell if somthing is a single replacement reaction by seeing if it is a lone element like Sodium or Calcium

Answer:

1. False

2. True

3. False

4. True

5. True

Explanation:

Answer:

a lewis acid accepts electron pairs

Explanation:

a p e x

The fact that is true about Lewis acid is that A Lewis acid donates electron pairs. Hence option D is correct.

In chemistry, a Lewis acid is a chemical species that can accept a pair of electrons from another species, known as a Lewis base. Lewis acids are electron pair acceptors.

They can be identified by their tendency to form a covalent bond with a Lewis base by accepting a pair of electrons. This definition of Lewis acids and bases, provided by Gilbert N. Lewis, helped to provide a more comprehensive understanding of chemical reactions beyond the traditional acid-base theory.

Common examples of Lewis acids include metal cations, such as aluminum and boron, and compounds such as carbonyl compounds and acids with a positive charge. Lewis acids play an important role in many chemical reactions, including organic synthesis, coordination chemistry, and acid-catalyzed reactions.

Therefore, option D, A Lewis acid donates electron pairs is correct.

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Answer:

D

Explanation:

The air that we breathe in enters the nose or mouth, flows through the throat (pharynx) and voice box (larynx), and enters the windpipe (trachea). The trachea divides into two hollow tubes called bronchi.

Answer:

B B B B B B B B B B B B B B B B B B B B B B B B

b is not cell theory

Answer:

C

Explanation:

The molecules are farther apart in steam than in water.

Answer:

it is good for thermoelectric power plant cooling

it means that there is a lot of salt in the water

Someone would remove salt from water to be able to drink it

lastly, salt can be removed from water with reverse osmosis systems

Answer:

14.05moles

Explanation:

Given parameters:

Number of atoms of NaF  = 8.46 x 10²⁴atoms

Unknown:

Number of moles  = ?

Solution:

To solve this problem, we must understand that a mole of any substance contains the Avogadro's number of particles.

             6.02 x 10²³ atoms makes up 1 mole of an atom

             8.46 x 10²⁴ atoms will contain = [tex]\frac{8.46 x 10^{24} }{6.02 x 10^{23} }[/tex]  = 14.05moles

Answer:

14.05 moles

Explanation:

Answer:

22m/s

Explanation:

Given parameters:

Time  = 5s

Acceleration  = 4m/s²

Initial velocity  = 2m/s

Unknown

Final speed  = ?

Solution:

To solve this problem, we use the expression below;

         v = u + at

v is the final speed

u is the initial speed

a is the acceleration

t is the time taken

 So, insert the parameters and solve;

         v  = 2 + 4 x 5  = 22m/s

Answer:

c

Explanation:

Answer:

240

Explanation:

15 POUNTS 240

Answer:

I know Z

Explanation:

because here is mixing two substance so there is mixture

The number of neutrons present : 11

Given

²¹Ne

Required

Number of neutrons

Solution

In the following element notation,

[tex]\large {{{A} \atop {Z}} \right X}[/tex]

X = symbol of element

A = mass number

   = number of protons + number of neutrons

Z = atomic number

   = number of protons = number of electrons, on neutral elements

So the symbol above shows the mass number Ne: 21

Ne itself has an atomic number of 10, so the number of neutrons :

number of neutrons  = mass number - atomic number

number of neutrons  = 21 - 10

number of neutrons  = 11

Answer:

ummm according 2 me babies are consumers and rocks are also consumers

Answer:

10.71 g/mL

Explanation:

Initial Volume = 17.5 mL

Final Volume = 20.3 mL

Volume of cube = Final Volume - Initial Volume = 20.3 mL - 17.5 mL = 2.8mL

Mass of cube = 30g

Density = Mass / Volume

Density = 30 / 2.8 = 10.71 g/mL

The two activities that happen as the embryo grows are: D. The cells divide and B. The cells form new organisms. The correct answer is option B and D, respectively.

Cell division is the process by which a single cell divides into two or more daughter cells. It is a fundamental process in all living organisms and is essential for growth, development, and repair of tissues. There are two main types of cell division: mitosis and meiosis.

As the embryo grows, its cells divide and multiply, which leads to an increase in the number of cells. This process is called cell division and is necessary for the growth and development of the embryo.

In addition to cell division, the cells in the embryo also differentiate and specialize to form the various tissues and organs of the body. This process is called morphogenesis and is essential for the formation of a functional organism.

Therefore, the correct options are B. The cells form new organisms and D. The cells divide, respectively.

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Answer: mutualism

Explanation: animals pollinating flowers is an example of a mutualistic relationship since both the flower and pollinator benefit from one an other. In the plant-pollinator relationship, Flowers provide the pollinator with nectar and pollen, which the pollinators then collect for feeding; and the pollinators provide flowers with the means to reproduce, by spreading pollen from flower to flower.

Answer:

Group 7A

Explanation:

The group 7A elements consists of the most reactive non-metals on the periodic table.

This group is known as the group of halogens. They consist of element fluorine, chlorine, bromine, iodine and astatine.

Answer:

Explanation:

The given chemical formula is;

             4H₂O                 H₈O₄

H₂O signifies 2 atoms of hydrogen bonding with 1 atom of oxygen

H₈O₄ signifies 8 atoms of hydrogen bonding with 4 atoms of oxygen

  The 4 coefficient before H₂O signifies the number of moles.

It appears H₂O is 4 moles of water

                  H₈O₄  is 1 mole of the compound

The number of moles of each of the compound differs.

The difference between the two chemical formulas has been on the basis of the number of the molecules present. There have been 4 molecules of [tex]\rm H_2O[/tex], while only 1 molecule of [tex]\rm H_8O_4[/tex].

The chemical formula has been used for the determination of the number of atoms of each element present in the compound.

The chemical formula 4 [tex]\rm H_2O[/tex] gives the idea that there have been 4 molecules of water, with each molecule has consisted of 2 hydrogens and 1 oxygen atom. The total number of atoms has been 8 hydrogen atoms and 4 oxygen atoms.

The chemical formula [tex]\rm H_8O_4[/tex] gives insight into the presence of 1 molecule having 8 atoms of hydrogen and 4 atoms of oxygen.

The similarity in the chemical formula has been the presence of the same number of atoms. The difference between the two chemical formulas has been on the basis of the number of the molecules present. There have been 4 molecules of [tex]\rm H_2O[/tex], while only 1 molecule of [tex]\rm H_8O_4[/tex].

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