Can anyone help me with my homework

Answer:

H=mc∆T

H=15×4.18×20

H=1254J

The catalytic effects 'lower temperatures and pressures can be used' would be most beneficial for the oil industry.

A catalyst is a chemical substance that has the potential to speed up the velocity if a particular reaction.

In conclusion, the catalytic effects 'lower temperatures and pressures can be used' would be most beneficial for the oil industry.

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Answer:

B

Explanation:

The element from which it is easier to remove an electron between Argon and Bromine is Bromine.

This can be explained by electron affinity.

Electron affinity is defined as amount of the energy released when one mole of electron is added to one mole of atom or to the outermost or valence shell to form anion. It is the measure of attraction existing between atom and electron.

Electron affinity of Bromine is 324.537 kJ/mol and electron affinity of Argon is -96 kJ/mol. A higher electron affinity indicates that an atom accepts or removes the electrons more easily and low electron affinity means that an atom do not accept or remove electrons as easily.

Bromine has atomic number 35, which means it has 35 protons in nucleus. It has 35 electrons and for a bromine atom to become a 1- bromide ion, it will have to gain an electron. If it loses electrons, it receives a positive charge because it has more protons than electrons.

Argon is a noble gas element. It means argon is highly stable because it has full outer shell of electrons. Argon has low affinity. Therefre, it does not lose or gain electrons because it is already stable.

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Answer:

There are 58 people in the cinema.

Explanation:

This number is actually exact and not subject to sig, digit rules.

Answer:

d) C₂H₅O₂

Explanation:

Molecular formula is a whole-number ratio of atoms presents in a molecule. The percentage given is in mass. Thus, we need to convert this percentage to moles using atomic mass of each atom and, in this way, we can solve for the ratio of atoms and molecular formula as follows:

C = 39.33g * (1mol / 12.01g) = 3.275mol

H = 8.269g * (1mol / 1.005g) = 8.228mol

O = 52.40g * (1mol / 16g) = 3.275mol

To obtain the ratio we must divide each amount of moles in the low number of moles (Moles of O or C):

C = 3.275mol / 3.275mol = 1

H = 8.229mol / 3.275mol = 2.5

O = 3.275mol / 3.275mol = 1

Multiplying this ratio in 2 (To obtain the whole-number ratio):

C = 1*2 = 2

H = 2.5*2 = 5

O = 1*2 = 2

The molecular formula is:

C₂H₅O₂

And right answer is:

Answer:

Mn

Explanation:

The cation in the chemical formula MnSe is the Mn specie.

Answer:

Explanation: I saw that you answered someone else's same question with toothpaste. What toothpaste did you use?

Answer:

0.491 atm

Explanation:

Initial volume V1 = 571.5 mL = 0.5715 L

Initial Pressure P1 = 0.944 atm

Initial Temperature T1 = 10 oC + 273 = 283 K (Converting to kelvin units)

Final Temperature T2 = 32 oC + 273 = 305K (Converting to kelvin units)

Final volume V2 = 1.183 L

Final Pressure P2 = ?

These parameters related by the combined gas law;

P1V1 / T1   = P2V2 / T2

Mke P2 subject of formular;

P2 = P1 V1 T2 / V2 T1

P2 = 0.944 * 0.5715 * 305  /  1.183 * 283

P2 = 0.491 atm

Answer: 39.948 grams

Explanation:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Ar, or 39.948 grams

Answer:

Explanation:

What occurs here (the description in the question) is condensation. Condensation is the process in which water changes from it's gaseous state (steam) to it's liquid state. When the hot air leaves the oven, and it touches/ passes through the glasses of John (that is of a lower thermal energy), the hot air would lose some of it's thermal energy (due to the lower thermal energy of the glasses) and then transits back to liquid forming the visible fog steam on the glasses.

Moles of potassium permanganate = 0.0008

Titration is a procedure for determining the concentration of a solution by reacting with another solution which is known to be concentrated (usually a standard solution). Determination of the endpoint/equivalence point of the reaction can use indicators according to the appropriate pH range  

Reaction

5Na2C2O4(aq) + 2KMnO4(aq) + 8H2SO4(aq) ---> 2MnSO4(aq) + K2SO4(aq) + 5Na2SO4(aq) +  10CO2(g) + 8H2O(1)

The end point ⇒titrant and analyte moles equal

titrant : potassium  permanganate-KMnO4

analyte : sodium oxalate - Na2C2O4

so moles of KMnO4 = moles of Na2C2O4

moles of Na2C2O4(mass = 0.2640 g, MW=134 g/mol) :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{0.264}{134 g/mol}\\\\mol=0.002[/tex]

From equation, mol ratio  Na2C2O4 : KMnO4 = 5 : 2, so mol KMnO4 :

[tex]\tt \dfrac{2}{5}\times 0.002=0.0008[/tex]

Answer:

They need more oxhygen to fraction to incresse

Explanation:

Answer:

droughts in California have become more common in California

Explanation:

Climate is weather over time which means that the first and the third one are just isolated incidents and the last answer choice shows climate but it doesn't show a change in climate

The length of lead wire in meters is 2.48 m.

The mass of lead in the wire is calculated as follows:

moles of lead = 0.0236 moles

molar mass of lead = 207

mass of lead = 0.0236 * 207

mass of lead = 4.8852 g

The length of the is determined as follows:

volume of wire = 4.8852/11.3

volume of wire = 0.432 cm³

diameter of lead wire = 0.470 mm = 0.047 cm

radius of the lead wire = 0.047 cm * 0.5 = 0.0235 cm

Assuming the lead wire is in the shape of a cylinder:

volume of the cylindrical lead wire = πr²l

l = volume/πr²

length of lead wire = 0.432/3.142 * 0.0235²

length of lead wire = 248.967 cm

length of lead wire in meters = 2.48 m

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Answer:

160 g

Explanation:

The chemical equation is:

C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + 6H₂O(g)

According to the equation, 1 mol of glucose (C₆H₁₂O₆) reacts with 6 moles of O₂. We calculate the masses of the reactants from the molar masses of the chemical elements:

1 mol C₆H₁₂O₆ = (6 x 12 g/mol)+ (12 x 1 g/mol) + (6 x 16 g/mol) = 180 g

6 mol O₂ = 6 x (2 x 16 g/mol) = 6 x 32 g/mol = 192 g

So, 180 g of C₆H₁₂O₆ reacts with 192 g of O₂. The stoichiometric ratio is 192 g O₂/180 g C₆H₁₂O₆. To calculate the grams of O₂ needed to react with 150 g of C₆H₁₂O₆ we can simply multiply the stoichiometric ratio by the grams of C₆H₁₂O₆:

150 g C₆H₁₂O₆ x 192 g O₂/180 g C₆H₁₂O₆ = 160 g O₂

Therefore, 160 grams of O₂ are needed to fully react with 150 g of glucose.

Answer:

Explanation:

Answer:

0.45 grams of hydrogen and 3.53 grams of oxygen will be formed, when 4.05 grams of water is used.

Explanation:

The given reaction is [tex]2H_20 \rightarrow 2H_2 + O_2[/tex]

2 moles of [tex]H_2O[/tex] is used to form 2 moles of [tex]H_2[/tex] and 1 mole of [tex]O_2[/tex]

As 1 mole of [tex]H_2O=18 g[/tex], 1 mole of [tex]H_2=2 g[/tex], and 1 mole of [tex]O_2=32 g[/tex].

So, 36 grams of [tex]H_2O[/tex] is used to form 4 grams of [tex]H_2[/tex] and 32 grams of [tex]O_2[/tex]

Therefore, 1 gram of [tex]H_2O[/tex] is used to form 4/36 grams of [tex]H_2[/tex] and 32/36 grams of [tex]O_2[/tex]

Therefore, 4.05 gram of [tex]H_2O[/tex] is used to form (1/9)4.09=0.45 grams of [tex]H_2[/tex] and (8/9)4.05=3.53 grams of [tex]O_2[/tex].

Hence, 0.45 grams of hydrogen and 3.53 grams of oxygen will be formed, when 4.05 grams of water is used.

Answer:

Ion exchange.

Explanation:

One of the ways in which water can be treated is through the process known as ION EXCHANGE. Using this for treating water has to do basically with the transfer or say the exchange of ions.

Ion exchanges is done by exchanging ions which are considered as 'unfit' or contaminants by the ones that are "fit".

Ions from what is known as zeolite or resin is been exchanged with the ions in the water. Cations are exchanged with cations and anions are exchanged with anions.

NB: this method is a good method or removing contaminants that are ions but not contaminants that are not ions.

Answer:

[CH3NH3]+ +OH- ----> CH3NH2 +H2O

Explanation:

"Compound: A substance that is made up of more than one type of atom bonded together. 

Mixture: A combination of two or more elements or compounds which have not reacted to bond together; each part in the mixture retains its own properties."

- Libre Texts

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Answer:

A. Bar graph

Explanation:

Bar graphs are used to compare things between different groups or to track changes over time. 

Answer:

option a, bar graph

Explanation:

- a graphic means of quantitative comparison by rectangles with lengths proportional to the measure of the data or things being compared

Answer:

you didn't show the options

Explanation:

The density : 21.63 g/L

The gas equation can be written  

[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.08206 L.atm / mol K  

T = temperature, Kelvin  

T = 65+273=338 K

P=2.36 atm

MW Iodine gas (I₂)=254

The density :

[tex]\tt \rho=\dfrac{P\times MW}{RT}\\\\\rho=\dfrac{2.36\times 254}{0.082\times 338}=21.63~g/L[/tex]

Answer:

The mass of ammonia (NH3) that contains [tex]1.00 \times 10^12[/tex] hydrogen atoms is [tex]9.4\times 10^{-12}[/tex] g.

Explanation:

As [tex]6.022\times 10^{23}[/tex] atoms of hydrogen = 1 mole of the hydrogen atom

Therefore, [tex]10^{12}[/tex] atoms of hydrogen [tex]= \frac{1}{6.022 \times 10^{23}}\times 10^{12}=1.66\times 10^{-12}[/tex] moles of the hydrogen atom.

Now, there are 3 moles of hydrogen atoms in 1 mole of ammonia [tex](NH_3)[/tex].

As the mass of 1 mole of ammonia is 17g, so

when there are 3 moles of hydrogen atoms, then the mass of ammonia = 17 g

Therefore, when there are [tex]1.66\times 10^{-12}[/tex] moles of hydrogen atoms, then the mass of ammonia [tex]= \frac{17}{3}\times 1.66\times 10^{-12}=9.4\times 10^{-12[/tex] g.

Hence, the mass of ammonia [tex](NH_3)[/tex] that contains [tex]1.00 \times 10^12[/tex] hydrogen atoms is [tex]9.4\times 10^{-12}[/tex] g.

The difference about the presence of water on Earth that sets it apart from the other inner planets is that either the planet is too hot that the water vaporizes or too cold that the water freezes.

The primary components of inner planets, commonly referred to as terrestrial planets, are rocks and metals. In comparison to the outer planets, they are modest in both size and shape. They have a molten metal core and a solid surface. The Solar System's four innermost planets are as follows (Mercury, Venus, Earth, and Mars).

Most importantly, since the temperature permits liquid water to exist for long periods of time, Earth is unique in that the majority of our planet is covered with liquid water.

Only the Earth possesses liquid water because all the other planets and moons are either too hot or too cold, causing any water that may be present to boil away or freeze.

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The displacement of the child : A. 0 m

Distance is a scalar quantity that indicates the length of the trajectory that is traveled by an object within a certain interval. Distance has no direction, only has a magnitude

Can be simplified distance = total meters traveled

Displacement is a vector quantity that shows changes in the position of objects in a certain interval of time. Displacement has magnitude and direction

Can be simplified displacement = distanced traveled from starting point to ending point

So the displacement of the child : 0 m

and the distance = the circumference of the rectangle :

[tex]\tt =2(l+W)\\\\=2(475+411)\\\\=1772~m[/tex]

Answer:

26.5 is your answer thank you