Plz help!!! How do I answer these??? :( I don’t get this at all!! Please help
Sorry meant to put under biology!

Answer:

B. Intermolecular forces are hard to overcome

Explanation:

A high boiling point indicates greater inter molecular forces between the molecules of the substance. Inter molecular forces is the force of attraction between the molecules of the substance, which has to be overcome or broken before the substance boils. Example, when water boils, the water molecule (H₂O) will be broken into hydrogen molecule and oxygen molecule.

Therefore, a high boiling point temperature indicates that intermolecular forces of the substance are hard to overcome.

B. Intermolecular forces are hard to overcome

Answer:

b

Explanation:

Answer: The mass of [tex]4.65\times 10^{22}[/tex] molecules of phosphorus pentoxide is 20.5 g

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given molecules}}{\text {avogadro's number}}=\frac{4.65\times 10^{22}}{6.023\times 10^{23}}=0.0772moles[/tex]

1 mole of [tex]P_2O_5[/tex] weigh =  283.9 g

Thus 0.0772 moles  of [tex]P_2O_5[/tex] weigh = [tex]\frac{283.9}{1}\times 0.0722=20.5g[/tex]

Thus the mass of [tex]4.65\times 10^{22}[/tex] molecules of phosphorus pentoxide is 20.5 g

Answer:

The products will occupy a volume of 56.448 L when measured at STP

Explanation:

The first thing to check here is the mole ratio of the reactant in question to the product.

From the chemical equation, we can see that 1 mole of CS2 gave a total mole of 3 moles of the products(1 mole of carbon iv oxide and 2 moles of sulphur iv oxide)

Now if 1 mole of reactant can give 3 moles of the products,

then 0.84 mole of reactant will give 3 * 0.84 moles of the product = 2.52 moles of the products

We are told to calculate the total volume.

At STP , 1 mole of a gaseous substance will occupy a volume of 22.4L or 22.4 dm^3 (liters and dm^3 are same)

This means that 2.52 moles will occupy a volume of 22.4 * 2.52 = 56.448L

Answer:

c is the speed of light

Explanation:

E: energy

m: mass

c2: speed of light squared

Answer:

The ionisation energy increases.

Explanation:

This is because the force of attraction between the electrons and the positive nucleus will increase

Answer:

) Molar concentration =1000*2.54/(127*250) ;since molarity=1000*W/M*V

=0.08 M here W=amount of solute in gm

M= molecular weight of solute

v=volume of solution in ml or cm3

2)% concentration (w/v) =(2.54/250)*100=1.016%

Explanation:

Answer:

chemcial energy :)

Explanation:

Answer:

at the light = radiant energy

at the line = electical energy

at the battery = chemical energy

Answer:

Il of the above are part of the Kinetic Molecular Theory

Explanation:

Answer: Which of the following are part of kinetic-molecular theory?

Choices:

1. The particles in a solid do not move.

2. The particles in a liquid are moving past one another constantly.

3. The particles in gas move freely in all directions.

4. The particles in a solid vibrate in a fixed position.

5. The particles in a solid are far apart.

6. The particles in a gas have few attractions between them.

7. The particles in all states of matter are always moving.

Explanation: Which of the following are part of kinetic-molecular theory...

Answers:

2. The particles in a liquid are moving past one another constantly.

3. The particles in gas move freely in all directions.

4. The particles in a solid vibrate in a fixed position.

6. The particles in a gas have few attractions between them.

7. The particles in all states of matter are always moving.

Answer:

Chemical Change

Explanation:

Mixing these elements together creates a chemical change

Making of a salad dressing is a physical change  as there is no change in the chemical composition.

Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.

Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.Magnetism, crystallization, formation of alloys are all reversible and hence physical changes.

They involve only rearrangement of atoms and are often characterized to be changes which are reversible.

Learn more about physical changes,here:

https://brainly.com/question/17931044

#SPJ2

Answer:

A

Explanation:

In this question, we are to calculate the enthalpy of change of the reaction. ΔH

To be able to do that, we use the Hess’ law and it involves the subtraction of the summed heat reaction of the reactants from that of the product.

Thus, mathematically, the enthalpy of change of the reaction would be;

[ΔH(CCl4) + 4 ΔH(HCl)] - [ΔH(CH4) + 4 ΔH(Cl2)]

We can see that we multiplied some heat change by some numbers. This is corresponding to the number of moles of that compound in question in the reaction.

Also, for diatomic gases such as chlorine in the reaction above, the heat of reaction is zero.

Thus, we can have the modified equation as follows;

[ΔH(CCl4) + 4 ΔH(HCl)] - [ΔH(CH4)]

Substituting the values we have according to the question, we have;

-95.98 + 4(-92.3) -(-17.9)

= -95.98 - 369.2 + 17.9

= -447.28 KJ/mol

Answer:

Food in the stomach that is high in protein will dilute absorption of alcohol in your stomach :) therefore always drink with food in your stomach, just drinking alchol without food will have serious consequences on helath.

Explanation:

Answer:

Coke, coal gas, gas carbon, ammonia liquor, and coal oil 

Answer:

waves that move through matter only are called mechanical waves.

waves that move through space only are called electromagnetic waves.

Waves that move through matter only are called

(mechanical) waves.

Waves that move through space are called

(electromagnetic) waves.

Could I get a brainliest please?

Answer:

fraction of oil left in the bed = 8 × 10 ⁻⁷

Explanation:

Answer:

See below

Explanation:

It is neither, at least not at room temperature.

Citric acid exists as a power at room temperature, but can be crystallized from cold water. This can be considered it's " solid state, " but as I mentioned before this acid is a powder. Take a look at the attachment below. This is a citric acid present as a crystal;

Answer:

Noble gases are a unique set of elements in the periodic table because they don't naturally bond with other elements.

Explanation:

HAVE A GOOD DAY!

Answer:

The answer is Noble Gases!!

Explanation:

Hope i helped yall! Have a super fantastic day!! Play Among Us! (Of course when your done with school) lol, jk, but u can!! Byes yall!

Answer:

A) anaerobic respiration

B) photosynthesis

C) breathing

Answer:

i)a. P & R

b. Q& S

ii) R

iii) Atomic no & Atomic radius

2)a. C4H10

b. CH3Cl

Answer:  A. 28

If we aren't talking about an isotope, then the number of neutrons and the number of protons in the nucleus are the same. Each proton weighs one atomic unit, and the same can be said about a neutron as well. So half of the weight is from the protons and half is from the neutrons. The electrons are extremely small relative to the protons that their weight is negligible.

Answer:

320.23g of CH3OH.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

CO(g) + 2H2(g)—> CH3OH(l)

Next, we shall determine the masses of CO and H2 that reacted and the mass of CH3OH produced from the balanced equation. This is illustrated below below:

Molar mass of CO = 12 + 16 = 28g/mol

Mass of CO from the balanced equation = 1 x 28 = 28g

Molar mass of H2 = 2x1 = 2g/mol

Mass of H2 from the balanced equation = 2 x 2= 4g

Molar mass of CH3OH = 12 + (3x1) + 16 + 1 = 32g/mol

Mass of CH3OH from the balanced equation = 1 x 32 = 32g

From the balanced equation above,

28g of CO reacted with 4g of H2 to produce 32g of CH3OH.

Next, we shall determine the the limiting reactant. This is illustrated below:

From the balanced equation above,

28g of CO reacted with 4g of H2.

280.2g of CO will react with =

(280.2 x 4)/28 = 40.03g of H2.

From the calculations made above, we can see that only 40.03g out of 50.5g of H2 is required to react completely with 280.2g of CO.

Therefore, CO is the limiting reactant and H2 is the excess reactant.

Finally, we shall determine the mass of methanol, CH3OH produced from the reaction.

In this case, the limiting reactant will be used because it will give the maximum yield of the reaction since all of it is used up in the reaction. The limiting reactant is CO and the mass of methanol, CH3OH produced can be obtained as follow:

From the balanced equation above,

28g of CO reacted to produce 32g of CH3OH.

Therefore, 280.2g of CO will react to produce = (280.2 x 32)/28 = 320.23g of CH3OH.

Therefore, 320.23g of CH3OH were produced from the reaction.

Answer:

this claim may not be accurate because the blog is produced by someone who is not an expert in the field of human psychology.

Explanation:

Answer:

this claim may not be accurate because the blog is produced by someone who is not an expert in the field of human psychology.

Explanation: give the branliest to the otherperson :)

Answer:

organisms in rain water and the number of organisms in pond water because the dependant variable never changes

Explanation:

because the dependant variable never changes

Answer:

0.086J/g°C

Explanation:

The following data were obtained from the question:

Mass (M) = 30g

Initial temperature (T1) = 10°C

Final temperature (T2) = 45°C

Change in temperature (ΔT) = T2 – T1 = 45°C – 10°C = 35°C

Heat (Q) released = 90J

Specific heat capacity (C) of wood =..?

We can obtain the specific heat capacity of the wood as follow:

Q = MCΔT

90 = 30 x C x 35

Divide both side by 30 x 35

C = 90/(30 x 35)

C = 0.086J/g°C.

Therefore, the specific heat capacity of the wood is 0.086J/g°C.

Answer:

Explanation:F

Answer: Because alchemy was based on mystical belief instead of the scientific method.Soo.. Chemistry uses experiments to test ideas whereas alchemy used superstitious practices.

Explanation:

Answer:

that was because Alchemy was based on experimentation and had little basis in Science, while Chemistry utilizes both experimentation and scientific practices.

Explanation:

Answer:

Another eight cups of pure water will be required.

Explanation:

Start by calculating the amount (in cups) of vinegar in these six cups:

Therefore, if these six cups of solutions were mixed, the mixture would contain [tex]0.05 + 0.20 + 0.45 = 0.70[/tex] cups of vinegar. Also, the mixture is supposed to have a volume of six cups. Therefore, the concentration of this six-cup mixture would be:

[tex]\displaystyle \frac{0.70\; \rm cups}{6\; \rm cups} \approx 12\%[/tex].

In other words, if these six cups of vinegar-water solutions are mixed, it would be necessary to dilute (by adding more water) before reaching the concentration of [tex]5\%[/tex].

The goal is to dilute this solution with [tex]0.70[/tex] cups of vinegar to a concentration of [tex]5\%[/tex]. Consider: what would be the volume the solution after dilution?

The volume of a solution can be found from the quantity and concentration of its solute:

After dilution, the volume of this solution would be:

[tex]\displaystyle \frac{0.70\; \rm cups}{0.05} = 14\; \rm cups[/tex].

At this moment, this solution only has a volume of six cups. Therefore, [tex]14 - 6 = 8[/tex] cups of pure water will be required.

The blueprint process

The best known is a process using ammonium ferric citrate and potassium . The paper is impregnated with a solution of ammonium ferric citr

Answer:

mushroom

mold

spore cases

hyphae

fungus