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3 years ago

What is the variable that a scientist changes when conducting an experiment

Chemistry

1 answer:

marin [14]3 years ago

4 0

Manipulated variable

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How would the group best find out whether their study is worth more time and resources

Hoochie [10]

Answer:

By presenting the results in a poster session.

Explanation:

Several scientists from different countries are asked to examine the results of an experiment before a journal will print it.

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3 years ago

Wastewater discharged into a stream by a sugar refinery contains 3.40 g of sucrose (C12H22O11) per liter. A government-industry

Ipatiy [6.2K]

<u>Answer:</u> The pressure that must be applied to the apparatus is 0.239 atm

<u>Explanation:</u>

To calculate the osmotic pressure, we use the equation for osmotic pressure, which is:

$\pi=iMRT$

or,

$\pi=i\times \frac{m_{solute}}{M_{solute}\times V_{solution}\text{ (in L)}}}\times RT$

where,

$\pi$ = osmotic pressure of the solution

i = Van't hoff factor = 1 (for non-electrolytes)

$m_{solute}$ = mass of sucrose = 3.40 g

$M_{solute}$ = molar mass of sucrose = 342.3 g/mol

$V_{solution}$ = Volume of solution = 1 L

R = Gas constant = $0.0821\text{ L atm }mol^{-1}K^{-1}$

T = temperature of the solution = $20^oC=[20+273]K=293K$

Putting values in above equation, we get:

$\pi =1\times \frac{3.40g}{342.3g/mol\times 1}\times 0.0821\text{ L. atm }mol^{-1}K^{-1}\times 293K\\\\\pi =0.239atm$

Hence, the pressure that must be applied to the apparatus is 0.239 atm

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4 years ago

Balance the equation: KL+Pb(NO3)2→PbL2+KNO3

Kruka [31]

Is that Lr? I'm not sure what the L one stand for?
2:1:1:2

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3 years ago

The chemical symbol for helium is H

Komok [63]

Answer:No, it is He

Mark me brainlieist

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3 years ago

1. Three quantum numbers are derived from Schrodinger’s equation that describe the probability of finding an electron around a n

Alenkasestr [34]

Answer:

Tenant farming is an agricultural production system in which landowners contribute their land and often a measure of operating capital and management, while tenant farmers contribute their labor along with at times varying amounts of capital and management.

Explanation:

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4 years ago