10. Which one of the following is not true about covalent bonds?
Most covalent substances do not dissolve well in water
Covalent bond can form polar and non polar bonds and shape
Covalent bond is one of the strongest bonds
Most of covalent substance does not conduct heat and electricity
Most covalent bonds have moderate to love melting and boiling point

Answer:

2 mol CH 4

Explanation:

43.8 x L

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

22.4 x L x mol - 1

Answer:

1. B

2. 100 C

3.  C

4. D

5. D

Explanation:

Answer:

Liquid isopropanol.

Explanation:

Liquid isopropanol will evaporate earlier than water because the boiling point of isopropanol is less than water. That liquid which have high boiling point require more heat energy for change into vapor state as compared to those liquids that has low boiling point. The isopropanol has boiling point i.e. 82.5 °C while on the other hand, water has boiling point i.e. 100 °C so we can say that isopropanol will evaporate first.

The liquid that will be the first to evaporate within 5 minutes is; Liquid Isopropanol

We have the 2 liquids as;

Liquid Isopropanol

Liquid water

Now, since we are dealing with the one that will evaporate within five minutes, we need to know their boiling points.

From online research;

Boiling point of liquid isopropanol is 82.5°C

Boiling point of liquid water is 100°C

Now, we are told that the same energy is transferred for both liquids. However, boiling point of the liquid with the lower boiling point will be achieved first and as a result will evaporate first since the next stage after boiling point is evaporation of steam.

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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:

The answer is 0.073

Explanation:

Final step: 0.73 x 10^-1

Answer:

1

Explanation:

Formula of molarity is

[tex]M=\frac{n}{v}[/tex]

M= molarity

n= no of moles

v= volume in liters (if mL then you have to convert it to L)

Answer:

chemical energy to  kinetic energy

Explanation:

Answer:

A. Chemical energy to kinetic energy and gravitational potential

energy

Explanation:

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:

The fox who shed their heavy coat in the summer.

Explanation:

If a fox has the ability to shed its coat in the summer, it will have no difficulties adapting to new temperatures even during winter. However, the heavy-coated one will.

Explanation:

The mixture of cryolite and aluminium oxide has a lower melting point than pure aluminium oxide. This means a lower amount of energy is required to establish effective conditions for electrolysis and thus makes it more cost effective.

Answer:

covalent is the bonding that occurs in H2O  

Explanation:

Answer: 219 kJ

Explanation:

Answer:

Sorry I am not very good at chemistry.

Explanation:

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: The enthalpy change for formation of butane is -125 kJ/mol

Explanation:

The balanced chemical reaction is,

[tex]C_4H_{10}(g)+\frac{13}{2}O_2(g)\rightarrow 4CO_2(g)+5H_2O(l)[/tex]

The expression for enthalpy change is,

[tex]\Delta H=[n\times H_f{products}]-[n\times H_f{reactants}][/tex]

Putting the values we get :

[tex]\Delta H=[4\times H_f_{CO_2}+5\times H_f_{H_2O}]-[1\times H_f_{C_4H_{10}}+\frac{13}{2}\times H_f_{O_2}][/tex]

[tex]-2877=[(4\times -393)+(5\times -286)]-[1\times H_f_{C_4H_{10}}+\frac{13}{2}\times 0][/tex]

[tex]H_f_{C_4H_{10}=-125kJ/mol[/tex]

Thus enthalpy change for formation of butane is -125 kJ/mol

Answer: a- 323 b- 15

Explanation:

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:

Radical

Explanation:

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

Answer:

The electrons located between the two nuclei are bonding electrons. A hydrogen molecule forms from two hydrogen atoms, each with one electron in a 1 s orbital. The two hydrogen atoms are attracted to the same pair of electrons in the covalent bond. The bond is represented either as a pair of dots or as a solid line.

A the soda will increase in volume

Answer:

1 & 3

Explanation:

Elements have similar chemical and physical properties if and only if they belong to the same group of elements in the periodic table.

A group of elements in the periodic table is a family of elements, the elements in the in the same group have the same number of valence electrons in their outermost shell, share similar chemical reactivity (with slight variation within the group) and similar physical properties  (with slight variation within the group).

Magnesium, radium, beryllium and barium all belong to group 2 hence they have similar chemical and physical properties.

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:

plato is the answer

Explanation:

that what i think it it is

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:

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.