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Masja [62]
3 years ago
8

It is best to dispense chemicals from large stock bottles into smaller containers for use at your lab station because smaller co

ntainers are easier to manage and reduce waste.True / False.
Chemistry
1 answer:
Orlov [11]3 years ago
7 0

Answer:

True

Explanation:

Dispensing chemical from large stock bottles into smaller container makes sure that students only takes the quantity they need which reduces wastage. Also in situation where the students did not finish the reagent or chemical it is easier for student to pour back into smaller bottle than the entire reagent bottle which can contaminate the whole solution. Small bottles prevent or reduces the risk of spillage because it is easier to handle and pour.

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Can you identify a sample from a living organism by examining it under a microscope? Yes or No
Ghella [55]
Vguttfvjhhutdxcbhyyyhhhhhhh HD jv bc HD g G G HD F G G f ft
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3 years ago
The combustion of ethane ( C 2 H 6 ) produces carbon dioxide and steam. 2 C 2 H 6 ( g ) + 7 O 2 ( g ) ⟶ 4 CO 2 ( g ) + 6 H 2 O (
grigory [225]

Answer:

10.6 moles of CO₂ are produced in this combustion

Explanation:

The combustion reaction is:

2C₂H₆ (g) + 7O₂ (g) ⟶ 4CO₂ (g) + 6H₂O (g)

We assume the ethane as the limiting reactant because the excersise states that the O₂ is in excess.

We make a rule of three:

2 moles of ethane can produce 4 moles of CO₂

Therefore 5.30 moles of ethane will produce (5.3 . 4) /2 = 10.6 moles

7 0
3 years ago
Question 1(Multiple Choice Worth 50 points)
irinina [24]

Answer:

because it's shellfish

Explanation:

A slipper

7 0
3 years ago
Read 2 more answers
A buffer with a pH of 4.31 contains 0.31 M of sodium benzoate and 0.24 M of benzoic acid. What is the concentration of [ H 3 O ]
Mnenie [13.5K]

<u>Answer:</u> The hydronium ion concentration in the solution is 1.29\times 10^{-4}M

<u>Explanation:</u>

To calculate the molarity, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}

Moles hydrochloric acid solution = 0.060 mol

Volume of solution = 1 L

Putting values in above equation, we get:

\text{Molarity of HCl}=\frac{0.060}{1L}\\\\\text{Molarity of HCl}=0.060M

The chemical reaction for aniline and HCl follows the equation:

                   C_6H_5COO^-+HCl\rightarrow C_6H_5COOH+Cl^-

<u>Initial:</u>           0.24          0.060              0.31

<u>Final:</u>             0.18          -                     0.37

To calculate the pH of acidic buffer, we use the equation given by Henderson Hasselbalch:

pH=pK_a+\log(\frac{[\text{conjugate acid}]}{[\text{base}]})

pH=pK_a+\log(\frac{[C_6H_5COO^-]}{[C_6H_5COOH]})

We are given:

pK_a = negative logarithm of acid dissociation constant of benzoic acid = 4.2

[C_6H_5COO^-]=0.18M

[C_6H_5COOH]=0.37M

pH = ?

Putting values in equation 1, we get:

pH=4.2+\log(\frac{0.18}{0.37})\\\\pH=3.89

To calculate the hydronium ion concentration in the solution, we use the equation:

pH=-\log[H_3O^+]

pH = 3.89

Putting values in above equation, we get:

3.89=-\log[H_3O^+]

[H_3O^+]=10^{-3.89}=1.29\times 10^{-4}M

Hence, the hydronium ion concentration in the solution is 1.29\times 10^{-4}M

3 0
3 years ago
Question 4 to make a 0.500 m solution, one could take 0.500 moles of solute and add 1.00 l of solvent. enough solvent to make 1.
stealth61 [152]
The answer is enough solvent to make 1.00 L of solution. Since molarity is the number of moles of solute in one liter of solution, adding 0.500 mole solute to one liter solvent might not result to a solution with one liter total volume. Less than one liter solvent is first added to dissolve 0.500 mole solute and then the solution is carefully filled with more solvent until the solution reaches to one liter total volume. Hence, the resulting solution is a 0.500M concentration.
7 0
3 years ago
Read 2 more answers
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