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nadya68 [22]
4 years ago
13

Leaves and grass are the only two items that can be used in composting. true or false

Chemistry
1 answer:
Fiesta28 [93]4 years ago
7 0
False, fruits such as apple cores and banana peels can be used in composting as well.
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.War nickels, produced from 1942-1945 are composed of 56% copper, 35% silver and 9% manganese. How many moles of each element ar
AnnZ [28]
The moles  of each element  found in a 5.00 g nickel coin is calculated as below

moles =mass/molar mass

calculate the mass of each element  =% composition of element/100 x total mass of  nickel

Mn = 9/100 x5 = 0.45g
Cu=56/100 x5= 2.8 g
Ag= 35/100x5=  1.75 g
moles of each element is therefore=
Mn = 0.45g/54.94 =  8.19 x10^-3 moles

Ag=1.75g/107.87 g/mol = 0.0162 moles

Cu = 2.8 g/63.5 g/mol=0.0441  moles





3 0
4 years ago
Who was the scientist that coined the term cell?
Doss [256]
Robert Hooke was the scientist that coined the term cell
5 0
3 years ago
A 2.50L sample of nitrogen gas at a temperature of 308K has a pressure of 1.15atm. What is the new volume of the gas if the pres
iris [78.8K]

Answer:

1.48L

Explanation:

From the question given, we obtained the following data:

V1 (initial volume) = 2.50L

T1 (initial temperature) = 308K

P1 (initial pressure) = 1.15atm

P2 (final pressure) = 1.80atm

T2 (final temperature) = 286K

V2 (final volume) =..?

Using the general gas equation P1V1/T1 = P2V2/T2, the final volume of the gas can obtain as follow:

P1V1/T1 = P2V2/T2

1.15 x 2.5/308 = 1.8 x V2/286

Cross multiply to express in linear form:

308 x 1.8 x V2 = 1.15 x 2.5 x 286

Divide both side by 308 x 1.8

V2 = (1.15 x 2.5 x 286)/(308 x 1.8)

V2 = 1.48L

Therefore, the new volume of the gas is 1.48L

7 0
3 years ago
How many moles of each element are in one mole of Be(OH)2?
REY [17]
B. 1 mole of beryllium, 2 moles of oxygen, 2 moles of hydrogen
8 0
3 years ago
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Which of the following elements could replace iron in a compound? A) Ag, B) Ca, C) Cu, or D) Sn?
mestny [16]
B: Ca can best replace iron in a compound! Vote me brainiest! <3
7 0
4 years ago
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