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Kipish [7]
3 years ago
15

When should a plastic volumetric flask be used instead of a more accurate glass flask? 1. when measuring acids 2. when measuring

hazardous chemicals - the plastic flask is disposable 3. when perfoming trace analysis and the analyte may adsorb to a glass surface
Chemistry
1 answer:
Jlenok [28]3 years ago
5 0

Answer:3.

Explanation:when performing trace analyses and the analyte may adsorb to the glass.

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Make the selection that best completes the sentence.
mylen [45]
The answer would be C. in an ellipse

Hope this answer helps!
5 0
3 years ago
Read 2 more answers
the element copper cu has two naturally occurring isotopes. 69% of all coopers consist of atom with 34 neutrons, 31% of all samp
solniwko [45]
Answer : Average atomic weight of copper atoms will be 63.62 u. 

Explanation : For calculating average atomic weight for any given atom we use this formula,

m = Σm_{i} X % abundance

where, m - avg atomic mass of isotope.
and m_{i} - mass of isotope

on solving we get, 
m = [63 u X (69/100)] + [65 u X (31/100)] = 63.62 u.

6 0
4 years ago
If your car gets 30.3 mi/gal, how many gallons of gasoline would you use if you drove 506.3 miles? 1 mile = 5280 ft (exactly) In
Salsk061 [2.6K]

Answer: 16.7 gallon

Explanation:

Given: The car can drive 30.3 miles when 1 gallon of gasoline is used.

Distance covered = 506.3 miles

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For 506.3 miles, the amount of gasoline used=\frac{1}{30.3}\times 506.3=16.7gallon

Thus the amount of gasoline used is 16.7 gallons.


4 0
3 years ago
Read 2 more answers
If 20.6 grams of ice at zero degrees Celsius completely change into liquid water at zero degrees Celsius, the enthalpy of phase
netineya [11]

Answer:

True

Explanation:

4 0
4 years ago
Which of the solids investigated could be used to make a hand warmer? Describe soenbof the critical characteristics an ionic sol
Tatiana [17]

Answer:

Iron and vermiculite.

Explanation:

Iron and vermiculite are the solid substances used to make a hand warmer. Hand warmers contains iron, water, activated carbon, vermiculite, cellulose, and salt. The high melting, boiling points, hard and brittle are the characteristics of an ionic solid used in hand warmer. Iron is the ionic solid which is used in the hand warmer. Once iron exposed to air, the iron oxidizes and releases heat in the process.

5 0
4 years ago
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