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kirill [66]
3 years ago
10

5 kinds of trace fossils

Chemistry
1 answer:
ivolga24 [154]3 years ago
4 0
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Need help ASAP PLEASE!!
seropon [69]
What about? You must provide a question :)
8 0
3 years ago
You are given a sample of several compounds to separate by paper chromatography. You draw a pencil line exactly 1.00 cm from the
Pavel [41]

Answer:

a) 6.3 cm

b) 8.0 cm

c) 0.7875

Explanation:

(a) The compound has moved above upto 7.3 cm from the bottom of the paper. Let us assume that line is drawn at 1.0 cm mark as the origin of spot. \

Distance traversed by compound= 7.3 - 1.0 cm = 6.3 cm

(b) Distance traversed by the solvent = 9.0 - 1.0 cm = 8.0 cm

(c) The Rf = Compound Migration distance / Solvent front migration distance

                      = 6.3/8.0 = 0.7875

7 0
3 years ago
A sample of a compound contains 3.21 g of sulfur and 11.4 g of fluorine. Which of the following represents the empirical formula
Murrr4er [49]

Answer: The empirical formula will be SF_6

Explanation:

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of S= 3.21 g

Mass of F = 11.4 g

Step 1 : convert given masses into moles.

Moles of S =\frac{\text{ given mass of S}}{\text{ molar mass of S}}= \frac{3.21g}{32g/mole}=0.1moles

Moles of F =\frac{\text{ given mass of F}{\text{ molar mass of F}}= \frac{11.04g}{19g/mole}=0.6moles

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For S= \frac{0.1}{0.1}=1

For F = \frac{0.6}{0.1}=6

The ratio of S: F= 1: 6

Hence the empirical formula is SF_6

7 0
3 years ago
I don't know if this is a chemistry question but I need help its a science question from what I know!
Alex17521 [72]

Answer:

The 3 rd answer

Explanation:

Atomic number is the number of protons in the nucleus of that element...

Mass number is the the sum of protons and neutrons in the nucleus of the atom..

6 0
3 years ago
The word "continental" means that the air mass formed over ____________.
statuscvo [17]

Answer:

over land is the correct ☑ answer plz mark me as brainliest

have a great day ahead

8 0
3 years ago
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