In calculating the mean donation amount, which steps would you need to take? Check all that apply.

A)Multiply each donation amount by the number of people. B)Add the total amount of money. C)Add the total number of people D)2,550 ÷ 25 = $102 E)25 ÷ 2,550 = $0.01

When solid surfaces slide over each other, the kind of friction that occurs is called Sliding Friction.

Answer:

B

Explanation:

The answer is substitution

Answer:

2-Methyl-5-nitrothiophene  

Explanation:

The 2- and 5-positions of thiophene are the most susceptible to electrophilic aromatic substitution.

Thus, the major product from the reaction of 2-methylthiophene with HNO₃ in acetic acid is 2-methyl-5-nitrothiophene.

Answer:

C. It is nonspontaneous and requires an electric current.

Explanation:

Electroplating refers to the process of coating a metal on the surface of another metal. Electroplating may be carried out to improve the properties of a metal or to preserve it from corrosion.

Electroplating involve the process of electrolysis. In electrolytic cells, electrical energy causes nonspontaneous reactions to occur in a process known as electrolysis. Electrolytes are decomposed during electrolysis by the passage of direct current to form ions.

The entire process of electrolysis is non spontaneous. It requires the input of electric electric current. This is achieved by connecting a battery to supply energy to drive the non spontaneous process.

Answer:

400000

Explanation:

First, figure out what 10^5 is. It is 100000. Then multiply it by 4 and there is your answer!

Also if it is 4x10^-5, it is 0.00004!

Oh yeah! If you want it to be in scientific notation, it is: 4x10^5

Since that I didn't quite understand what you are trying to question, it is either 4x10^5 or 4x10^-5!

Answer:

I think its city y, I don't know if its right though.

Explanation:

Answer:

D. decreased biodiversity

Explanation:

Habitat loss due to the increasing human

population has caused decreased biodiversity

Explanation:

Avogadro's number. What can be said about 1 mol Ag and 1 mol Au? ... They contain the same number of atoms.

1 mole of Ag and 1 mole of Au contain the same number of particle. Therefore, option B is correct.

The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material. It is specified that the mole contains exactly 6.022140761023 elementary entities.

A mole is defined as the mass of a substance that has the same number of elementary particles as there are atoms in precisely 12.000 g of 12C.

In the periodic chart, group 11 includes the chemical elements roentgenium (Rg), copper (Cu), silver (Ag), and gold (Au). However, no chemical tests have yet been done to demonstrate that roentgenium behaves similarly to the heavier homologue of gold.

Thus, option B is correct.

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Answer: Yes we agree with the student's claim.

Explanation:

When the molecules are present in smaller size, more reactants can react as decreasing the size increases the surface area of the reactants which will enhance the contact of molecules.Hence, more products will form leading to increased rate of reaction.

On increasing the temperature will make more reactant molecules will have sufficient energies to cross the energy barrier and thus the number of effective collisions increases, thus leading to more products and increased rate of reaction.

When the solution is stirred , the molecule's kinetic energy and thus the rate of reaction increases.

Thus smaller size, stirring and increase of temperature will make the solution quickly.

Answer:

Electrical

There are five types of kinetic energy: radiant, thermal, sound, electrical and mechanical.

Answer:

2J/g°C

Explanation:

Q = 5000J

Initial temperature (T1) = 20°C

Final temperature (T2) = 70°C

Specific heat capacity (c) = ?

Heat energy (Q) = mc∇T

Q = mc∇T

Q = mc(T2 - T1)

5000 = 50 × c × (70 - 20)

5000 = 50c × 50

5000 = 2500c

c = 5000 / 2500

c = 2J/g°C

The specific heat capacity of the substance is 2J/g°C

Answer:

H2

Explanation:

Hydrogen gas isn't a compound but it is diatomic when found naturally hence the 2

Answer:

When an acid and a base react with each other, a neutralization reaction occurs, forming a salt and water. The water forms from the combination of the H + ions from the acid and the OH - ions from the base. Strong acids and strong bases completely dissociate, so the reaction yields a solution with a neutral pH (pH = 7).

Explanation:

Answer:

habitat change, climate change, invasive species, and pollution

Explanation:

Answer:

I’m looking for an answer aswell

Explanation:

Answer: Because it's a combination of chemicals, vodka doesn't freeze at the same temperature as either water or alcohol. Of course, vodka will freeze, but not at the temperature of an ordinary freezer. This is because vodka contains enough alcohol to lower the freezing point of water below the -17°C of your typical freezer.

Explanation: .......

Answer: you will need 400 potatoes

Explanation:

Answer:

0.46M NaS₂O₃ (Assuming KIO₃ solution with a concentration of 1.0M)

Explanation:

Based on the reaction:

6 Na₂S₂O₃ + KIO₃ + 5 KI + 3 H₂SO₄ → 3 Na₂S₄O₆ + 3 H₂O + 3 K₂SO₄ + 6 NaI

6 moles of  Na₂S₂O₃ react per mole of KIO₃

Assuming the molarity of the KIO₃ solution is 0,1M:

Moles of KIO₃: = 5.0x10⁻³L ₓ (0.1 mol / L) = 5.0x10⁻⁴ moles

As 6 moles of thiosulfate reacted per mole of iodate:

5.0x10⁻⁴ moles KIO₃ ₓ (6 moles Na₂S₂O₃ /  1 mole KIO₃) =

3.0x10⁻³ moles of Na₂S₂O₃. In 6.5mL (6.5x10⁻³L):

3.0x10⁻³moles Na₂S₂O₃ / 6.5x10⁻³ L = 0.46M NaS₂O₃

Answer:

answering what???

Explanation:

Answer:

I answered

Explanation:

Answer: a computer

Explanation:

Answer:

5 is the answer since I did this and got it rigt

Answer:

positive

Explanation:

Explanation:

A proton has positive charge ...

Answer:

Paratroopers not hurt while landing because when they get to the ground, they keep their knees and feet together helping them to land properly.

hope it helps!

Answer:

they usually land on their knees and roll

Explanation:

Answer:

18 g...i think 90 percent sure its 18

Answer:

a) Trichloromethyl

b) Trinitrogen Pentoxide

c) Carbogen

Explanation:

Iodine-131  is a radioactive element  which keeps on decaying over the time. Decay of radioactive element always comes under first order kinetics. Therefore 16.2mg mass would be available after 48 days if a hospital has a 750mg sample of it available.

Half life tells about the time at which the radioactive material decays to half of its initial concentration.

Mathematically, for first order reaction, the relationship between half life and rate constant can be given as

[tex]t_{1/2} = \frac{0.693}{K}[/tex]

where k = rate constant

[tex]t_{1/2} \\[/tex]= half life= 8 days

Substituting the given values

k=0.693÷8 =0.08days⁻¹

[tex]k=\frac{2.303}{t}log\frac{a}{a-x}[/tex]

a= initial concentration

a-x = final concentration after 48 days

[tex]0.08=\frac{2.303}{48 }log\frac{ 750}{a-x}[/tex]

solving this we get

a-x= 16.2mg

Therefore, 16.2mg mass would be available after 48 days if a hospital has a 750mg sample of it available.

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Answer:

Explanation:

The first attached diagram shows the proposed phenol that is being treated with KOH to form Oxonine (CₐHₐO).

Reaction of Arylhalide after treatment with KOH lead to the displacement of Bromine atom with the hydrogen from the hydroxyl (OH) substituent , then  forming HBr  , leaving the oxy (-O) atom  alone to form an Oxonine compound.

Therefore the propose structure for the product (Oxonine) CₐHₐO is shown in the second diagram attached below.

Answer: The volume of product formed is 0.26 L

Explanation:

[tex]\text{Moles of solute}=\frac{\text{given mass}}\times{\text{Molar Mass}}[/tex]    

[tex]\text{Moles of} H_2=\frac{0.02g}{2g/mol}=0.01moles[/tex]

[tex]2H_2(l)+O_2(l)\rightarrow 2H_2O(g)[/tex]

As [tex]O_2[/tex] is the the excess reagent, [tex]H_2[/tex] is the limiting reagent as it limits the formation of product.

According to stoichiometry :

2 moles of [tex]H_2[/tex] give = 2 moles of [tex]H_2O[/tex]

Thus 0.01 moles of [tex]H_2[/tex] will give =[tex]\frac{2}{2}\times 0.01=0.01moles[/tex]  of [tex]H_2O[/tex]

According to ideal gas equation:

[tex]PV=nRT[/tex]

P = pressure of gas = 101.325 kPa = 1 atm

V = Volume of gas = ?

n = number of moles = 0.01

R = gas constant =[tex]0.0821Latm/Kmol[/tex]

T =temperature =[tex]40^0C=(40+273)K=313K[/tex]

[tex]V=\frac{nRT}{P}[/tex]

[tex]V=\frac{0.01mol\times 0.0821L atm/K mol\times 313K}{1atm}=0.26L[/tex]

Thus the volume of product formed is 0.26 L

Answer:A unit rate describes how many units of the first type of quantity corresponds to one unit of the second type of quantity. Some common unit rates are miles (or kilometers) per hour, cost per item, earnings per week, etc.

Explanation: hope this helps mark as brainiest

Answer:

3.46

Explanation:

-log(3.50*10^-4) = 3.46