Which statement describes the difference between covalent bonds and Van
der Waals forces?
A. Covalent bonds form when there is an attraction between
nonpolar molecules, while Van der Waals forces cause two atoms
to share valence electrons.
B. Covalent bonds occur when two atoms share valence electrons,
while Van der Waals forces cause an attraction between positive
and negative ions.
C. Covalent bonds form when two atoms share valence electrons,
while Van der Waals forces cause an attraction between nonpolar
molecules
D. Covalent bonds form from the attraction of positive ions and freely
moving electrons, while Van der Waals forces cause an attraction
between nonpolar molecules.
it

Answer:

Explanation:

sun is the main source while the other object reflect light on the sun

Answer:

Beryllium fluoride - BeF2

Barium fluoride - BaF2

Strontium sulfide - SrS

Titanium(II) chloride - TiCl2

Iron(II) sulfate - FeSO4

Vanadium(III) cyanide - V( CN )3

Answer

7.53% 97% if you divide it you can get the answer

Explanation:

Answer:

C

Explanation:

Primary succession occurs when pioneer species move into an area that has no plants. This happens because of Mosses and lichens that can grow on rocky surfaces and the correct option is option B.

Primary succession refers to the establishment of a community in an uninhabited area such as rocks.

It is a type of ecological succession (the evolution of a biological community’s ecological structure) in which plants and animals first colonize a barren, lifeless habitat.

Species that arrive first in the newly created environment are called pioneer species, and through their interactions they build a simple initial biological community.

Therefore, Primary succession occurs when pioneer species move into an area that has no plants. This happens because of Mosses and lichens that can grow on rocky surfaces and the correct option is option B.

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Answer:

The correct answer would be -

17. 50% chances of round offspring

18. 25% chances two copies of dominant allele in the genotype of offspring

Explanation:

17. In this question it is stated that the Spongebob is heterozygous and has a square body which means the square body is dominant over the round that is present in sponge Susie that means she has two copies of the recessive allele.

S for square trait and s for a round trait then

    S     s

s Ss    ss

s Ss    ss

Thus, the correct answer is 50 percent as there are only two copies of ss.

18. in this question Patric and Patti both have heterozygous for the pink (P) body-color dominant over yellow (p). The chances for the true-breeding dominant genotype would be -

     P    p

P   PP  Pp

p   Pp  pp

There is only one out of four rue-breeding dominant offspring will be produced.

Answer:

The functional unit of a product system is a quantified description of the performance requirements that the product system fulfils. The functional unit should as far as possible relate to the functions of the product rather than to the physical product.

Explanation:

Answer:

Please one time click here

Mark brainliest

Answer:

Red is the lowest.

Explanation:

Answer:

All the elements on the periodic table start with a capital letter and only some of them have a second letter that is lower case. So if you see two capital letters together in a ion then you will know that it is a polyatomic.

Answer: All the elements on the periodic table start with a capital letter and only some of them have a second letter that is lower case. So if you see two capital letters together in a ion then you will know that it is a polyatomic.

Explanation:

Answer:

The cinnamon cost would be "$8.62". A further explanation is given below.

Explanation:

Cinnamon's density,

= 0.560 g/ml

On converting it into g, we get

= [tex]0.560\times 500[/tex]

= [tex]280 \ g[/tex]

Cinnamon's volume,

= 500 ml

As we know,

1 pound = 435.592 g

Now,

The cost pf cinnamon per pound will be:

=  [tex]\frac{6.98}{0.5 \ pound}[/tex]

=  [tex]13.96[/tex] ($) per pound

So,

Cinnamon's cost will be:

=  [tex]250 \ g\times \frac{1 \ pound}{435.592 \ g}\times \frac{13.96}{1 \ pound}[/tex]

=  [tex]8.62[/tex] ($)

Answer:

Explanation:

25 % ( m / v ) mannitol solution means 25 gram in 100 cc of water

25 gram in 100 mL of water

grams of mannitol in 30 mL = 25 x 30 / 100

= 7.5 grams .

Answer:

2.1 atm

Explanation:

We are given the following variables to work with:

Initial pressure (P1): 2.5 atm

Initial temperature (T1): 320 K

Final temperature (T2): 273 K

Constant volume: 7.0 L

We are asked to find the final pressure (P2). Since volume is constant, we want to choose a gas law equation that relates initial pressure and temperature to final pressure and temperature. Gay-Lussac's law does this:

[tex]\frac{P_{1}}{T_1} =\frac{P_{2}}{T_2} \\[/tex]

We can rearrange the law algebraically to solve for [tex]P_{2}[/tex].

[tex]{P_{2}} =\frac{(T_2)(P_{1} )}{T_1} \\[/tex]

Substitute your known variables and solve:

[tex]P_2 = \frac{273K(2.5atm)}{320K} = 2.1 atm[/tex]

Answer:

true

Explanation:

Answer:

d) C,O,F

Explanation:

because if you add up the atomic no.s  (which is directly the size of the element)of each set d) is smallest.

Answer:

Selenium trisulfide

Answer:

The gas under pressure subjected to heat can cause the tank to explode. A scuba tank filled to capacity with compressed air at 3000 psi could just as easily go up to 3400-3500 psi if heated

Explanation:

Air molecules are free to move and as more air is added to the tank, the molecules move and collide faster which raises the temperature. Hence option D is correct.

Pressure is defined as the force applied perpendicularly to an object's surface divided by the surface area over which it is applied. The movement of the molecules and the collisions they have with one another and the vessel walls cause the pressure to build up. According to general relativity theory, pressure contributes to the mass-energy cause of gravity by making a gravitational field stronger.

The tank may blow up if the gas within was under pressure and exposed to heat. If heated, the pressure of a scuba tank filled to capacity with compressed air at 3000 psi may readily increase to 3400-3500 psi. Because air molecules are free to move, the temperature in the tank rises as more air is introduced, as the molecules move and collide more quickly.

Thus, air molecules are free to move and as more air is added to the tank, the molecules move and collide faster which raises the temperature. Hence option D is correct.

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Answer:

Explanation:

Since salt is composed of two ions Na+ and Cl- it will attract to the opposite poles of the water and form a ion-dipole bond. This will cause the phenomenon freezing point depression where as the name states it will take a lower tempertature to freeze it. So instead of freezing at 0 degrees c it will freeze at a negative 2 or so on.

The salt ions end up slowing the growth of ice as the water molecules re-freeze.

Freezing point depression can be defined as the decreasing of the freezing point of pure solvents upon the addition of different kinds of solutes.

Depression in the freezing point can be defined as a colligative property that is proportional to the molality of the solution.

As liquid water gets colder and colder, the motions of water molecules become slower and slower. When salt is added to water, the saltwater solution is composed of both water molecules and dissolved salt ions.

As a result, salt ions can easily replace some of the water molecules. Saltwater freezes more slowly than pure water due to many of the water molecules would be "crashing" into the ice's surface in pure water and are replaced by salt ions.

Therefore, the salt water will freeze at a lower temperature than the pure water.

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Answer:

2.8 m

Explanation:

:)

Answer:

plato is the answer

Explanation:

that what i think it it is

Answer:

Mole

Explanation:

In solids, amount of substance is given by;

n = mass/molar mass

n will have a unit of mole

However, in liquids, amount of substance is;

n = concentration × volume

Again, n will be in mole

Thus, the SI unit that represents the amount of substance is mole

Answer:

c. Gas particles don't interact

Explanation:

Ideal gas particles do not interact with each other.

The gas molecules do not interact with each other except for colliding with each other. Gases expand to completely fill a container; they would not if they were attracted to each other. That being said, they obviously still do, as a result of Dalton's Law.

Answer:

4.98 moles of H₂O

Explanation:

The balanced chemical equation for the combustion of propane is:

C₃H₈ (g) + 5 O₂ (g) ⟶ 3 CO₂ (g) + 4 H₂O (g)

That means that 1 mol of propane (C₃H₈) produces 4 moles of water (H₂O).

We know that 1 mol is equal to 6.022 x 10²³ molecules. So, we convert the molecules of propane to moles as follows:

7.50 x 10²³ molecules C₃H₈ x 1 mol/6.022 x 10²³ molecules = 1.245 mol C₃H₈

Now, we use the stoichiometric ratio 4 mol H₂O/1 mol C₃H₈ derived from the chemical equation to calculate the moles of water produced:

1.245 mol C₃H₈ x 4 mol H₂O/1 mol C₃H₈ = 4.98 mol H₂O

Answer: 219 kJ

Explanation:

Answer:

2 mol CH 4

Explanation:

43.8 x L

----------------                      = 2 mol CH 4

22.4 x L x mol - 1

Answer:

Radical

Explanation:

Wait did I get your quiz right? Are you asking for the name? If so it's radical