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alex41 [277]
1 year ago
12

Which is a type of star system?

Chemistry
1 answer:
Pepsi [2]1 year ago
7 0

<h2><em>hope my answer is useful..</em></h2><h2><em>hope my answer is useful.. </em></h2>

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Aside from silica gel and alumina what other stationary phase can you use in chromatography​
Svetlanka [38]

Answer:

Paper

Explanation:

In chromatographic separation, two different phases are important; a stationary phase and a mobile phase.

The stationary phase is the phase that does not move. Substances are separated based on how fast or slowly they move in the stationary phase.

The mobile phase is usually the solvent(or mixture of solvents) that carries the solutes through the stationary phase.

The stationary phase is usually composed of a porous material. Paper is a porous material. The mobile phase is trapped between the cellulose fibers of the paper and separation is achieved.

7 0
2 years ago
List the number of significant figures for the following numbers:
Dennis_Churaev [7]

Answer:

a) 2

b) 1

c( 1

d( 4

according to the picture

3 0
3 years ago
A water sample has a pH of 8.2 and a bicarbonate concentration of 97 mg/L. What is the alkalinity of the sample in moles/L and i
goldfiish [28.3K]

Answer:6.94

Explanation:

Molar mass of CaCO3=40+12+16×3

=40+12+48=100g/mol

Moles=mass of substance/molar mass

=97mg/100g=0.097/100=0.00097moles/L.

PH=-log[CaCo3]=-log(0.00097)=6.94

P.s it's log to base e

3 0
3 years ago
If you start with 1.000 gram sample of the isotope how much time would pass before you have just 0.100 grams of the isotope left
Vadim26 [7]

Answer:

So, you're dealing with a sample of cobalt-60. You know that cobalt-60 has a nuclear half-life of

5.30

years, and are interested in finding how many grams of the sample would remain after

1.00

year and

10.0

years, respectively.

A radioactive isotope's half-life tells you how much time is needed for an initial sample to be halved.

If you start with an initial sample

A

0

, then you can say that you will be left with

A

0

2

→

after one half-life passes;

A

0

2

⋅

1

2

=

A

0

4

→

after two half-lives pass;

A

0

4

⋅

1

2

=

A

0

8

→

after three half-lives pass;

A

0

8

⋅

1

2

=

A

0

16

→

after four half-lives pass;

⋮

Explanation:

now i know the answer

6 0
2 years ago
In a certain variety of plants, red flowers appear in majority of plants and blue flowers appear only in a few plants. Which sta
Jlenok [28]

Answer:

C

Explanation:

3 0
3 years ago
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