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4 years ago

Subsistence farming is the dominant economic activity in which of the following countries?

2 answers:

7 0

Subsistence farming is not used anymore, only occasionally in certain parts of the world but in the 1800's it was used in the U.S. by people who only planted enough to get them by, and if they had the smallest portion left they traded it, typically for alcohol

Sladkaya [172]4 years ago

5 0

Developing countries such as parts of south America, Asia, and Africa

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Can someone help me i guess .

slavikrds [6]

Answer:

Whereas weather refers to short-term changes in the atmosphere, climate describes what the weather is like over a long period of time in a specific area. Different regions can have different climates. To describe the climate of a place, we might say what the temperatures are like during different seasons, how windy it usually is, or how much rain or snow typically falls.

Explanation:

3 0

3 years ago

Is low pressure air created when warm air rises?

nadezda [96]

Answer: yes

Warm air rising creates a low pressure zone at the ground. Air from the surrounding area is sucked into the space left by the rising air.

4 0

3 years ago

To locate the depth of the Great Lakes, you should look on a data map.

olga_2 [115]

This is a true statement because such things are found on data maps. Usually, lakes, oceans, rivers, or any other type of water, are indicated with shades of blue to show the depth. The greater the depth the darker the blue will be.

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4 years ago

Read 2 more answers

During the colonial period goods were mostly transported on

umka21 [38]

Answer rivers

Explanation: well it’s mostly Rogers but also railroads canals turnpikes and technology at the time made various of models available because of the movements of colonization grade industrlization and slave trade

4 0

3 years ago

Wetlands can play a significant role in removing fertilizer residues from rain runoff and groundwater; one way they do this is t

Lana71 [14]

The question is incomplete, the complete question is;

Wetlands can play a significant role in removing fertilizer residues from rain runoff and groundwater; one way they do this is through denitrification, which converts nitrate ions to nitrogen gas:

2NO_3^-(aq) + 5 CO(g) + 2 H+(aq)  N2(g) + H2O(l) + 5 CO2(g)

Supposed 200.0 g of NO_3^- flows into a swamp each day. What volume of N2 would be produced at 17 deg C. and 1.00 atm if the denitrification process were complete? What volume of CO2 would be produced? Suppose the gas mixture produced by the decomposition reaction is trapped in a container at 17 deg C; what is the density of the mixture if we assume that the total P = 1.00 atm?

Answer:

See detailed solution below

Explanation:

First we must obtain the number of moles of NO3^- from

number of moles = mass/molar mass

mass of = 200g

molar mass of NO3^- = 62 g/mol

number of moles = 200g/62g/mol = 3.23 moles

From the reaction equation;

2 moles of NO3^- yields 1 mole of N2

3.23 moles yields 3.23 * 1/2 = 1.6 moles

From

PV = nRT

V = nRT/P

V = 1.6 * 0.082 * 290/1

V= 38 L

Then;

From the equation also;

2 moles of NO3^- yields 5 moles of CO2

3.23 moles of NO3^- yields 3.23 * 5/2 = 8.1 moles

So,

PV=nRT

V = nRT/P

V= 8.1 * 0.082 * 290/1

V= 192.6 L

Lastly

The temperature of the mixture is 17 degrees Celsius and the pressure of the mixture is 1 atm

the total number of moles of both gases = 1.6 + 8.1 = 9.7 moles

Volume of the mixture = nRT/P = 9.7 *0.082*290/1 = 230.67 L

Mass of N2 = 1.6 moles * 28 g/mol = 44.8 g

Mass of CO2 = 8.1 moles * 44 g/mol = 356.4 g

Total mass of gases = 44.8 + 356.4 = 401.2 g

Density of mixture = mass/volume = 401.2g/230.67 L

Density of mixture = 1.74 g/L

8 0

3 years ago