The person whose work led to a periodic table based on increasing atomic number was

Where do 80% of earthquakes occur? please help ??? due in 20 minutes

suter [353]

80% of earthquakes occur along the rim of the pacific ocean.

4 0

3 years ago

Read 2 more answers

I'm stuck on this assignment, +20 PTS and BRAINLIEST for step by step:

dolphi86 [110]

Answer:

2. 2.74 L

3. 488 K

4. 7.47 L

5. 38.6 L

6. 2.85 mol

7. 319 K

8. 3.43 kPa

Explanation:

Generally speaking, you want to convert units to SI units, but in this case, we are working with ratios. This makes up for using the units that wouldn't appropriate elsewhere.

2. Use the equation P₁V₁ = P₂V₂. Solve for V₂.

(3.05 L)(870 kPa) = (969 kPa)(V₂)

V₂ = 2.74 L.

3. Use the equation V₁/T₁ = V₂/T₂. Solve for T₂.

(3.32 L)/(360 K) = (4.50 L)/(T₂)

T₂ = 488 K.

4. Do the same as above, but for V₂.

(5.10 L)/(-56°C) = V₂/(-82°C)

V₂ = 7.47 L

5. Use the equation V₁/n₁ = V₂/n₂. Solve for V₂.

(37.2 L)/(0.750 mol) = (V₂)/(0.778 mol)

V₂ = 38.6 L

6. Do the same as above, but for n₂.

(86.0 L)/(2.65 mol) = (92.5 L)(n₂)

n₂ = 2.85 mol

7. Use the equation P₁/T₁ = P₂/T₂. Solve for T₂.

(3.00 atm)/(390 K) = (2.45 atm)/(T₂)

T₂ = 319 K

8. Do the same as above, but for P₂.

In this specific case, however you will need to convert units. Since both temperatures don't have the same sign, the ratio won't come out right. Convert to Kelvin. Add 273.15 to the temperature in Celsius to convert to Kelvin -12.3°C = 260.85 K 25°C = 298.15 K.

(3.00 kPa)/(260.85 K) = P₂/(298.15 K)

P₂ = 3.43 kPa

There is a lot in here... If you are confused about something, let me know!

6 0

3 years ago

Nickel replaces silver from silver nitrate in solution according to the following equation: 2AgNO3 Ni £ 2Ag Ni(NO3)2 a. If you h

uranmaximum [27]

Answer:

A. Nickel (Ni)

B. 60.28g

Explanation:

A. The balanced equation for the reaction is given below:

2AgNO3 + Ni —> 2Ag + Ni(NO3)2

Next, let us calculate the masses of AgNO3 and Ni that reacted from the balanced equation.

This is illustrated below:

Molar Mass of AgNO3 = 108 + 14 + (16x3) = 108 + 14 +48 = 170g/mol

Mass of AgNO3 from the balanced equation = 2 x 170 = 340g

Molar Mass of Ni = 59g/mol

To obtain the excess reactant, let consider the fact that all the mass sample of AgNO3 is used up in the reaction and see if there will be left over for Ni. If there is no left over then we'll consider the other way round.

From the balanced equation above,

340g of AgNO3 reacted with 59g of Ni.

Therefore, 112g of AgNO3 will react with = (112 x 59)/340 = 19.44g of Ni

Now let us check if there are left over for Ni. This is illustrated below:

Mass of Ni given from the question = 22.9g

Mass of Ni that reacted = 19.44g

Left over Mass of Ni = Mass of Ni from the question - Mass of Ni that reacted

Left over Mass of Ni = 22.9 - 19.44

Left over Mass of Ni = 3.46g

Since there are left over for Ni, therefore nickel (Ni) is in excess and AgNO3 is the limiting reactant.

B. To obtain the mass of nickel(II) nitrate, Ni(NO3)2, formed, the limiting reactant (AgNO3) is used.

The equation for the reaction is given below:

2AgNO3 + Ni —> 2Ag + Ni(NO3)2

Molar Mass of Ni(NO3)2 = 59 + 2[14 + (16x3)] = 59 + 2[14 + 48] = 59 + 2[62] = 59 + 124 = 183g/mol

Mass of AgNO3 from the balanced equation = 340g

From the balanced equation above,

340g of AgNO3 produced 183g of Ni(NO3)2.

Therefore, 112g of AgNO3 will produce = (112 x 183)/340 = 60.28g of Ni(NO3)2

From the calculations made above, 60.28g of Ni(NO3)2 is produced from the reaction of 22.9g of Ni and 112g of AgNO3

6 0

3 years ago

Read 2 more answers

In a college of exactly 2940 students, exactly 60 % are male. What is the number of female students?

Norma-Jean [14]

Answer:1176

Explanation:

Number of male students: 2940*(60/100)=1764

So the number of female students would be:

2940-1764=1176

5 0

3 years ago

Read 2 more answers

List four greenhouse gases in the atmosphere. For each gas, describe its prevalence in the atmosphere, its natural sources, its

lakkis [162]

Answer: Carbon Dioxide, Methane, Nitrous Oxide and Fuorinated Gases

Explanation:Carbon dioxide (CO2): Carbon dioxide enters the atmosphere through burning fossil fuels (coal, natural gas, and oil), solid waste, trees and other biological materials, and also as a result of certain chemical reactions (e.g., manufacture of cement). Carbon dioxide is removed from the atmosphere (or "sequestered") when it is absorbed by plants as part of the biological carbon cycle.

Methane (CH4): Methane is emitted during the production and transport of coal, natural gas, and oil. Methane emissions also result from livestock and other agricultural practices and by the decay of organic waste in municipal solid waste landfills.

Nitrous oxide (N2O): Nitrous oxide is emitted during agricultural and industrial activities, combustion of fossil fuels and solid waste, as well as during treatment of wastewater.

Fluorinated gases: Hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride, and nitrogen trifluoride are synthetic, powerful greenhouse gases that are emitted from a variety of industrial processes. Fluorinated gases are sometimes used as substitutes for stratospheric ozone-depleting substances (e.g., chlorofluorocarbons, hydrochlorofluorocarbons, and halons). These gases are typically emitted in smaller quantities, but because they are potent greenhouse gases, they are sometimes referred to as High Global Warming Potential gases ("High GWP gases").

5 0

3 years ago