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3 years ago

what is the realtionship between the kentic energy of molecules in an object and the objects tempeture

1 answer:

6 0

Temperature is a measure of the average kinetic energy of the particles in an object .Temperatures also measure how kinetic energy is not how hot or cold it is. It’s measuring what the amount of Kinetic Energy there when you throw something in the air and it comes back down

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25. Which is not a form of chemical changer

Salsk061 [2.6K]

Answer:

C. Digestion is the answer.

6 0

3 years ago

Read 2 more answers

What is the formula for weight ?

Oxana [17]

Answer:

W=F=mg or W=mg

Explanation:

6 0

3 years ago

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Aqueous sulfuric acid reacts with solid sodium hydroxide to produce aqueous sodium sulfate and liquid water . If of sodium sulfa

notka56 [123]

Answer:

27%

Explanation:

Hello,

The following information is missing, but I found it: "1.92 g of sodium sulfate is produced from the reaction of 4.9 g of sulfuric acid and 7.8 g of sodium hydroxide" so the undergoing chemical reaction is:

$2NaOH+H_2SO_4-->Na_2SO_4+2H_2O$

Now, to compute the percent yield, we must first establish the limiting reagent to subsequently determine the theoretical yield of sodium sulfate because the real (1.92g) is already given, thus, we consider the following procedure:

$n_{NaOH}=7.8gNaOH*\frac{1molNaOH}{40gNaOH}=0.2molNaOH\\n_{H_2SO_4}=4.9gH_2SO_4*\frac{1molH_2SO_4}{98gH_2SO_4}=0.050molH_2SO_4\\$

- The moles of sodium hydroxide that completely react with 0.05 moles of sulfuric acid are:

$0.2molNaOH*\frac{1molH_2SO_4}{2molNaOH}=0.098molH_2SO_4$

As this number is higher than the previously computed 0.05 moles of available sulfuric acid, one states that the sulfuric acid is the limiting reagent. Now, the theoretical grams of sodium sulfate are found via:

$0.05molH_2SO_4*\frac{1molNa_2SO_4}{1mol H_2SO_4} *\frac{142.04gNa_2SO_4}{1molNa_2SO_4} =7.1gNa_2SO_4$

Finally, the percent yield turns out into:

$Y=\frac{1.92g}{7.1g} *100$

$Y=27.0$ %

Best regards.

6 0

3 years ago

An analysis for copper was performed on two pure solids. One solid was found to contain 43.0% copper; the other contained 32.0%

fgiga [73]

Answer:

No, these sample could no be same

Explanation:

Percentage of copper in both sample are different means both are taken from different sample because if we says both are from same sample then its violates the law of definite proportion

according to this law a given compound always contains same proportion of element by mass and it does not depend on the source

eg: water from sea and drainage both have same composition means same amount of oxygen and hydrogen by mass is present

Hence given samples are not same

8 0

3 years ago

The average atomic mass of oxygen is 15.9994 amu. The atomic masses of its three isotopes are as follows: O-16: 15.995 amu; O-17

motikmotik

The average atomic mass of oxygen is the atomic mass with respect to 1/12th the mass of a C-12 atom, related to natural abundance.
amu - atomic mass units
O-16 - 15.995 amu
O-17 - 16.999 amu
O-18 - 17.999 amu
the average atomic mass is 15.9994 amu
average atomic mass = ∑atomic mass of each isotope * relative abundance percentage
in other words the average atomic mass is closer to the atomic mass of the most abundant isotope. In this case 15.9994 is closest to 15.995 amu which is the atomic mass of O-16.
This means that O-16 is the most abundant isotope.

7 0

3 years ago