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Lostsunrise [7]
3 years ago
15

An object had a mass of 8.5 g and a volume of 17 mL. What is the density of the object?

Chemistry
2 answers:
klio [65]3 years ago
7 0

Answer:

0.5 g/ml.

Explanation:

  • First we define density

Density (mass / volume) is a scalar magnitude referred to the amount of mass in a given volume of a substance.

Now if we have the mass is 8.5g. and occupies a volume of 17 ml.

to find the density we must find its mass / volume relation

d=\frac{8.5g}{17ml}= 0.5 g/m

forsale [732]3 years ago
3 0
That would be 0.5 g/ml because Density is equal to mass divided by volume and 8.5 is half of 17. 
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In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. The solu
Wewaii [24]

Answer:

1 and 2 - Physical change

3, 4, 5 and 6 - Chemical Change

Explanation:

A physical change is the conversion of one form into another. Like water is in natural state is liquid but at applying negative temperature like in a freezer, it will convert into ice which is just another form of water. At high temperature, water will convert into vapors and form steam. In all three states, water is just water in a different form. That's what a physical change is. It is a reversible process.

A chemical change is the conversion of one molecule into another form which cannot be reversed. Like burning of coal. You won't get coal after you have burnt it.

In the same experiment, there have been many physical and chemical changes.

1. Evaporation of Ethanol is a physical change as external heat is applied which separates ethanol from water in form of vapors.

2. Condensation of Ethanol is also a physical change where vapors of ethanol are being converted into liquid form.

3. Formation of carbon deposit inside the flask: This is a chemical change. As the experiment contained glucose, upon higher temperatures, glucose loses water molecules and forms carbon. Now, since we cannot convert carbon back to glucose in a simple step, therefore, it is a chemical change which cannot be reversed.

4. Formation of Carbon dioxide gas from Glucose: This is a chemical change. Carbon dioxide cannot be fixed into glucose without the help of a plant or certain chemical methods therefore it is a chemical change and cannot be reversed by normal means.

5. Burning of natural gas: It is a chemical process. Natural gas contains methane as the primary source of burning. It reacts with oxygen present in air and forms carbon dioxide and water and releases heat which is used to elevate the temperature of ethanol-water mixture to obtain purified ethanol.

6. Formation of ethanol from glucose by yeast:  It is also a chemical process, biochemical to be specific. Under the absence of air (Fermentation), yeast converts glucose to ethanol which is a chemical process because glucose has been used up and is not glucose anymore. It has been converted to ethanol.

4 0
3 years ago
Estimate the solubility of m(oh)2 in a solution buffered at ph = 7.0, 10.0, and 14.0.
kherson [118]
<span>When M(OH)2 dissolves we have M(OH)2 which produces M2+ and 2OHâ’ pH + pOH=14 At ph =7; we have 7+pOH=14 pOH=14â’7 = 7 Then [OHâ’]=10^(â’pOH) [OH-] = 10^(-7) = 1* 10^(-7) At ph = 10. We have, pOH = 4. And [OH-] = 10^(-4) = 1 * 10^(-4) Finally ph = 14. We have, pOH = 0 And then [OH-] = 10^(-0) -----anything raised to zero power is 1, but (-0)... So [OH-] = 1</span>
4 0
4 years ago
What is the mole fraction of each component in a solution made by mixing 300 g of ethanol(C2H5OH) and 500 g of water?
Snowcat [4.5K]

Answer:

The mole fraction of ethanol and water in the solution are 0.19 and 0.81 respectively.

Explanation:

The Molar Fraction is a way of measuring the concentration that expresses the proportion in which a substance is found with respect to the total moles of the solution, which are calculated by adding the moles of solute (s) and solvent.

It is calculated by dividing the number of moles of one of the components by the total number of moles of the solution.

The sum of all the molar fractions of the substances present in a solution is equal to 1.

So, the expression to calculate the mole fraction is:

Molar fraction (Xi)=\frac{moles of sudstance}{total moles of the solution}

Being the molar mass of the compounds:

  • Ethanol 46 \frac{g}{mol}
  • Water 18 \frac{g}{mol}

the number of moles that represent the mass quantities is calculated as:

  • Moles of ethanol: 300 grams* \frac{1 mol}{46 grams} = 6.52 moles
  • Moles of water: 500 grams* \frac{1 mol}{18 grams} = 27.78 moles

So the total moles in solution are 6.52 moles + 27.78 moles = 34.3 moles

The mole fraction of ethanol in the solution is calculated as:

mole fraction of ethanol=x_{ethanol} =\frac{6.52 moles}{34.3 moles}

x_{ethanol} =0.19

The mole fraction of water in the solution is calculated as:

mole fraction of water=x_{water} =\frac{27.78 moles}{34.3 moles}

x_{water} =0.81

Then:

x_{water} +x_{ethanol} = 0.81 + 0.19

x_{water} +x_{ethanol} =1

<u><em>The mole fraction of ethanol and water in the solution are 0.19 and 0.81 respectively.</em></u>

 

.

8 0
3 years ago
Which product has a bitter taste, is slippery when mixed with water, and can damage skin and eyes?
beks73 [17]

Answer:

sodium hydroxide

Explanation:

its a base and it can damage skin

7 0
3 years ago
Read 2 more answers
A buffer solution is prepared by adding 13.74 g of sodium acetate (NaC2H3O2) and 15.36 g of acetic acid to enough water to make
hoa [83]

Answer:

A buffer solution is prepared by adding 13.74 g of sodium acetate (NaC2H3O2) and 15.36 g of acetic acid to enough water to make 500 mL of solution.

Calculate the pH of this buffer.

Explanation:

The pH of a buffer solution can be calculated by using the Henderson-Hesselbalch equation:

pH=pKa+log\frac{[salt]}{[acid]}

The pH of the given buffer solution can be calculated as shown below:

6 0
3 years ago
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