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4 years ago

What advantages are there to graphical determinations of density over calculated density

1 answer:

6 0

When we make a graph for the determination of density, we place the mass on the y-axis and the volume on the x-axis, then plot each point. The greater accuracy achieved in the graphical method lies in the fact that a line of best fit is drawn to accommodate every point that is present on the graph. This means that all of the readings are being used to calculate the density; whereas, if you were to calculate density using only one reading of mass and volume, it would be far less accurate because it uses less data.

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Explain, in terms of particles, why hc2h3o2(aq) can conduct an electric current.

Elena L [17]

Answer is: because this compound in water dissociates on cations and anions and ions in solution conduct electricity.

Chemical dissociation of acetic acid in water:
CH₃COOH(aq) ⇄ CH₃COO⁻(aq) + H⁺(aq).
When we put electrodes (cathode and anode) in acetic acid solution, positeve and negative ions migrate to electrodes.
Negative acetate ions go to positive electrode and gives electrons to electrode.
Positive hydrogen ions go to negative electrode and gain electrons.

8 0

3 years ago

A sample of oxygen gas at a pressure of 1.19 atm and a temperature of 24.4 °C, occupies a volume of 18.7 liters. If the gas is a

mihalych1998 [28]

Answer:

$\boxed {\boxed {\sf 0.757 \ atm}}$

Explanation:

We are asked to find the pressure of a gas given a change in volume. Since the temperature remains constant, we are only concerned with volume and pressure. We will use Boyle's Law, which states the volume is inversely proportional to the pressure. The formula for this law is:

$P_1V_1= P_2V_2$

Initially, the oxygen gas occupies a volume of 18.7 liters at a pressure of 1.19 atmospheres.

$1.19 \ atm * 18.7 \ L = P_2V_2$

The gas expands to a volume of 29.4 liters, but the pressure is unknown.

$1.19 \ atm * 18.7 \ L = P_2 * 29.4 \ L$

We are solving for the new pressure, so we must isolate the variable $P_2$ . It is being multiplied by 29.4 liters. The inverse operation of multiplication is division. Divide both sides of the equation by 29.4 L.

$\frac {1.19 \ atm * 18.7 \ L}{29.4 \ L} =\frac{ P_2 * 29.4 \ L}{29.4 \ L}$

$\frac {1.19 \ atm * 18.7 \ L}{29.4 \ L} =P_2$

The units of liters cancel.

$\frac {1.19 \ atm * 18.7 }{29.4 } =P_2$

$\frac {22.253}{29.4 } \ atm = P_2$

$0.7569047619 \ atm =P_2$

The original measurements all have 3 significant figures, so our answer must have the same. For the number we calculated, that is the thousandth place. The 9 in the ten-thousandth place to the right of this place tells us to round the 6 up to a 7.

$0.757 \ atm \approx P_2$

The pressure of the gas sample is approximately 0.757 atmospheres.

3 0

3 years ago

Read 2 more answers

A solution of water (kb=0.512 ?c/m) and glucose boils at 103.06 ?c. what is the molal concentration of glucose in this solution?

nirvana33 [79]

When a solute is added to a solvent, some properties are affected and these set of properties are called colligative properties. The properties depend on the amount of solute dissolved in a solvent. For this we use the boiling point elevation of the solution. We do as follows:

ΔT(boiling point) = 103.06 °C - 100.0 °C= 3.06 °C
ΔT(boiling point) = (Kb)m
m = ΔT(boiling point) / Kb
m = 3.06 °C / 0.512 °C kg / mol
m = 5.98 mol / kg

4 0

4 years ago

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Why orang utans are said to be an endemic species

skad [1K]

They’re endangered. ......

4 0

3 years ago

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Which element belongs to the p6-block of the periodic table?

-Dominant- [34]

Noble gasses I think I could be wrong tho

5 0

2 years ago