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frutty [35]
3 years ago
5

Which solution when mixed with a drop of bromthymol blue will cause the indicator to change from blue to yellow?

Chemistry
1 answer:
Mashutka [201]3 years ago
3 0
When you mix 0.1 M HCI, with a drop of brothymol blje, this will make the incubator to change from blue to yellow.
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A mineral is scratched by apatite but not by calcite what could it’s hardness value be
mojhsa [17]

Answer:

hi!

Explanation:

The Mohs Hardness Scale ranks the order of hardness of minerals and some common objects. For example, your fingernail can scratch the minerals talc and gypsum, with a hardness of 2 or lower. A copper penny can scratch calcite, gypsum, and talc.

One of the most important tests for identifying mineral specimens is the Mohs Hardness Test.  

This test compares the resistance of a mineral to being scratched by ten reference minerals known as the Mohs Hardness Scale (see table at left).  

The test is useful because most specimens of a given mineral are very close to the same hardness. This makes hardness a reliable diagnostic property for most minerals.

"Hardness" is the resistance of a material to being scratched. The test is conducted by placing a sharp point of one specimen on an unmarked surface of another specimen and attempting to produce a scratch.  

5 0
3 years ago
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Our understanding of the atom has changed over time which idea that was once accepted is now consider scientifically inaccurate
MA_775_DIABLO [31]

An atom is a solid sphere is now considered scientifically inaccurate.

So the correct answer is B.

Hope this helps,

Davinia.

4 0
3 years ago
2co(g) + o2(g)→2co2 (g) What type of reaction is shown
ivolga24 [154]
This type of reaction is called: Synthesis
8 0
4 years ago
- Name 2 scientists that were the first to observe cells.
ExtremeBDS [4]

one was Robert Hooke but idk the other one

3 0
3 years ago
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. The pI is called ________________. The rule of calculating pI of an amino acid is that first, write the dissociation equation
umka21 [38]

Answer:

The isoelectric point is that the <u>pH </u>at which the compound is in an electronically neutral form.

For diss equations<u>, p</u>lease find them in the enclosed file.

The pIs of 2 amino acids:

  • Glutamate: pI = 3,2
  • Histidine: pI = 7,6

Explanation:

Formula for the pI calculation: pI = (pKa1 + pKa2)/2

Given 3 pKa :

  • Acid glutamic with an acid sidechain:

Use the lower 2  pKas (corresponding with 2 -COOH groups)

pKa1 = 2,19; pKa2 = 4,25; so pI = 3,2

  • Histidine with 2 amino groups:

Use the higher 2 pKas ( -COOH group and -NH= group)

pKa1 = 6; pKa2 = 9,17; so pI = 7,6

6 0
4 years ago
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