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3 years ago

Which step in the scientific method has an if/then statement

Chemistry

1 answer:

kiruha [24]3 years ago

7 0

independent and dependent variables.

Now it's time to state your hypothesis. ...

2) The hypothesis is often written using the words "IF" and "THEN." For example, "If I do not study, then I will fail the test." The "if' and "then" statements reflect your independent and dependent variables.

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Which molecule is polar, based on structure? 1) sulfur dioxide 2) carbon disulphide 3) ethylene 4) carbon tetrachloride

Savatey [412]

I think the correct answer from the choices listed above is option 1. It would be the molecule carbon disulphide that will be polar, based on the structure of the choices given. Hope this answers the question. Have a nice day. Feel free to ask more questions.

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3 years ago

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The effectiveness of nitrogen fertilizers depends on both their ability to deliver nitrogen to plants and the amount of nitrogen

densk [106]

Answer:

Ammonia > Urea > Ammonium nitrate > Ammonium sulphate

Explanation:

Percentage by mass of nitrogen in NH3:

Molar mass of NH3= 17 g/mol

Hence % by mass = 14/17 × 100 = 82.35%

% by mass of NH4NO3

Molar mass of NH4NO3 = 80.043 g/mol

Hence; 28/80.043 × 100 = 34.98%

% by mass of (NH4)2SO4;

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Hence; 28/132.14 × 100 = 21.19%

% by mass of CH4N2O

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3 years ago

At what temperature will 0.654 moles of helium gas occupy 12.30 liters at 1.95 atmospheres?

DedPeter [7]

Answer:

447,25k

Explanation:

According to the ideal gas law

$PV=nRT$

Where:

P: is the pressure of the gas in atmospheres.

V: is the volume of the gas in liters.

n: number of moles of the gas

R: ideal gas constant

T: absolute temperature of the gas in kelvin

now using:

$T=\frac{PV}{nR}\\ \\T=\frac{12,3L.1,95atm}{0,654mol.0,082(L.atm/K.mol)}\\ \\T=447,25K$

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3 years ago

Consider the nuclear equation below. 239/94 Pu—-> X+ 4/2 He. What is X?

Anna007 [38]

Answer:

X = U (Uranium)

Explanation:

Pu-->235/92 U + 4/2 He

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3 years ago

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What do the suffix in a polyatomic ion mean

zysi [14]

Answer: The suffixes of the names of polyatomic ions have a pattern associated with them. ... For example, the sulfite ion has three oxygen atoms whereas the sulfate ion has four oxygen atoms.

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3 years ago