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Debora [2.8K]
3 years ago
15

PLEASE HELP(2 questions)!!!!! BRAINLIEST IF FIRST AND CORRECTLY ANSWERED!!!

Chemistry
1 answer:
professor190 [17]3 years ago
8 0
D
B
those are the correct answers
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The 10x SDS gel electrophoresis buffer contains 250mM Tris HCl, 1.92M Glycine, and 1% (w/v) SDS. Buffers are always used at 1x c
olchik [2.2K]

Answer:

25 mM Tris HCl and 0.1% w/v SDS

Explanation:

A <em>10X solution</em> is ten times more concentrated than a <em>1X solution</em>. The stock solution is generally more concentrated (10X) and for its use, a dilution is required. Thus, to prepare a buffer 1X from a 10X buffer, you have to perform a dilution in a factor of 10 (1 volume of 10X solution is taken and mixed with 9 volumes of water). In consequence, all the concentrations of the components are diluted 10 times. To calculate the final concentration of each component in the 1X solution, we simply divide the concentration into 10:

(250 mM Tris HCl)/10 = 25 mM Tris HCl

(1.92 M glycine)/10 = 0.192 M glycine

(1% w/v SDS)/10 = 0.1% w/v SDS

Therefore the final concentrations of Tris and SDS are 25 mM and 0.1% w/v, respectively.

7 0
3 years ago
A gold-colored pebble is found in a stream. Its mass is 23.2 mg and its volume is 1.20 mm3. What is its density in grams per cub
Lilit [14]

Answer:

The density in g/cm3 is 1.9333(put a line above the 3's to show it's repeating).

And no it is not gold because the density of gold in g/cm3 is 19.3.

Explanation:

Divide the mass by the volume in order to get an object's Density.

so, 23.2 divided by 1.20 mm3

=1.93333333 g/cm3

That is the density then you find out the density of gold in grams per cubic centimeter, that is 19.3 g/cm3

For example, gold will always have a density of 19.3 g/cm3; if a mineral has a density other than that, it isn't gold.

4 0
3 years ago
A negative △H means an exothermic reaction.<br><br> True<br> False
Nostrana [21]
Your answer is False I think
6 0
4 years ago
Which has a larger molar mass, salt (NaCl) or sugar (C12H22011) – how can you tell?
uysha [10]

Answer:

Explanation:

Molar mass of NaCl = (23+35.5)

Molar mass of NaCl = 58.5g/mol

Molar mass of C12H22011

= 12(12) + 22(1) + 16(11)

= 144 +22 + 176

= 342g/mol

4 0
3 years ago
You are given 2.00l of a 1.50m nacl solution. how many grams of nacl are in this solution?
dimaraw [331]
Molarity is 1.5 M and the volume is 2 l; thus
The number of moles of NaCl will be given by;
Molarity × volume in liters
= 1.5 × 2 = 3 moles
But 1 mole of NaCl contains 58.5 g/mole
Therefore; the mass of 3 moles will be;
3 × 58.5 = 175.5 g
The mass of NaCl is therefore 175.5 g
4 0
3 years ago
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