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LenaWriter [7]
3 years ago
15

Many scientists, including Joseph Priestly, hypothesized that fuels lost mass as they burned due to the loss of a substance call

ed phlogiston. Since phlogiston was missing, these fuels could not undergo any further combustion. Which of the results in the experiment above refute this hypothesis?
a. Ethanol
b. Charcoal
c. Wood
d. Mercury
Chemistry
1 answer:
DanielleElmas [232]3 years ago
6 0
<h2>D this is a lot of hour to found but its ok thank you for sharing your question i hope this help</h2>

<h3>Carry on learning:)</h3>
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Round off each of the following numbers to two significant figures:
VashaNatasha [74]
A) 0.44
B) 9.0
C) 27.
D) 1.4 x 10^2
E) 1.5 x 10^-3
F) 0.45
4 0
3 years ago
Why does the mass of steel wool increase after getting burned? Help pls
Elenna [48]

Answer:

heat and large amount of surface area

Explanation:

the heat and surface area allows the iron in the wool to combine with oxygen. by doing this it increases the mass of the steel wool

4 0
3 years ago
Phosphoglucoisomerase interconverts glucose 6‑phosphate to, and from, glucose 1‑phosphate.
lawyer [7]

Answer:

Keq = 0.053

7.3 kJ/mol

Explanation:

Let's consider the following isomerization reaction.

glucose 6‑phosphate ⇄ glucose 1 - phosphate

The concentrations at equilibrium are:

[G6P] = 0.19 M

[G1P] = 0.01 M

The concentration equilibrium constant (Keq) is:

Keq = [G1P] / [G6P]

Keq = 0.01 / 0.19

Keq = 0.053

We can find the standard free energy change, ΔG°, of the reaction mixture using the following expression.

ΔG° = -R × T × lnKeq

ΔG° = -8.314 J/mol.K × 298 K × ln0.053

ΔG° = 7.3 × 10³ J/mol = 7.3 kJ/mol

7 0
3 years ago
A two-liter soft drink bottle can withstand apressure of
larisa86 [58]

Explanation:

According to the ideal gas equation, PV = nRT.

where,     P = pressure,        V = volume

               n = no. of moles,      R = gas constant

               T = temperature

Also, density is equal to mass divided by volume. And, no. of moles equals mass divided by molar mass.

Therefore, then formula for ideal gas could also be as follows.

                 P = \frac{mass}{volume \times molar mass} \times RT

or,             P = \frac{density}{\text{molar mass}} \times RT

Since, density is given as 0.789 g/ml which is also equal to 789 g/L (as 1000 mL = 1 L). Hence, putting the given values into the above formula as follows.

               P = \frac{density}{\text{molar mass}} \times RT

                  = \frac{789 g/l}{46.06 g/mol} \times 0.0821 L atm/mol K \times 373 K

                  = 525 atm

As two-liter soft drink bottle can withstand a pressure of  5 atm and the value of calculated pressure is 525 atm which is much greater than 5 atm.

Therefore, the soft drink bottle will  obviously explode.

4 0
3 years ago
A steel container filled with H₂ gas is at a pressure of 6.5 atm and a temperature of 22°C. If the container is placed near a fu
Yuki888 [10]

Answer: The new pressure is 7.1 atm

Explanation:

To calculate the final pressure of the system, we use the equation given by Gay-Lussac Law. This law states that pressure of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

\frac{P_1}{T_1}=\frac{P_2}{T_2}

where,

P_1\text{ and }T_1 are the initial pressure and temperature of the gas.

P_2\text{ and }T_2 are the final pressure and temperature of the gas.

We are given:

P_1=6.5atm\\T_1=22^0C=(22+273)K=295K\\P_2=?\\T_2=50^0C=(50+273)K=323K

Putting values in above equation, we get:

\frac{6.5}{295}=\frac{P_2}{323}\\\\P_2=7.1

Hence, the new pressure is 7.1 atm

8 0
2 years ago
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