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Irina18 [472]
3 years ago
15

A student performed the same experiment but used radish sprouts. their data showed three peaks for the optimal ph at 2.4, 8.5, a

nd 10.6. propose a logical hypothesis for the observed data.
Chemistry
1 answer:
prisoha [69]3 years ago
4 0
The logical hypothesis for the observed data could be something like :
The reason of the difference in optimal Ph between the experiments could be caused by the Enzyme extract of the different enzymatic forms of the Radish Sprouts , causing different level of Ph
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natural rubidium has the average mass of 85.4678 and is composed of isotopes 85 Rb(mass = 84.9117) and 87 Rb. The ratio of atoms
mote1985 [20]

Answer:

Mass of Rb-87 is 86.913 amu.

Explanation:

Given data:

Average mass of rubidium = 85.4678 amu

Mass of Rb-85 = 84.9117

Ratio of 85Rb/87Rb in natural rubidium = 2.591

Mass of Rb = ?

Solution:

The ration of both isotope is 2.591 to 1. Which means that for 2.591 atoms of Rb-85 there is one Rb-87.

For 100% naturally occurring Rb = 2.591 + 1 = 3.591

% abundance of Rb-85 = 2.591/ 3.591 = 0.722

% abundance of Rb-87 = 1 - 0.722= 0.278

84.9117 × 0.722 + X × 0.278 = 85.4678

61.306 + X × 0.278 = 85.4678

X × 0.278 = 85.4678 - 61.306

X × 0.278 = 24.1618

X =  24.1618 / 0.278

X = 86.913 amu

8 0
3 years ago
Please help!!
viva [34]

Answer:

Answer is 2nd

Explanation:

some energy is transformed into mass

5 0
3 years ago
Please help, don't understand this topic
Darya [45]

Answer:

<u><em>Pangaea</em></u>

<u><em>Alfred Wegner</em></u>

<u><em>plate tectonics</em></u>

Explanation:

What did Earth look like 250 million years ago? The continents of Earth were clustered together in formation that a scientist named<em> </em><u>Pangaea</u><u><em>.</em></u>The scientist that named "Pangaea" was a German scientist by the name of <u>Alfred Wegner.</u> He theorized that "Pangaea" split apart and the different landmasses, or continents, drifted to their current locations on the globe. Wegener's theories of plate movement became the basis for the development of the theory of <u>plate tectonics.</u>

8 0
3 years ago
During the dust bowl wind deposited surface minerals in a new location by what?
Alika [10]
"Saltation" which is the movement of hard particles such as sand over an uneven surface in a turbulent flow of air or water.
6 0
3 years ago
A 1300 mL sample of gas with a molar mass of 71.0 g/mol at STP has what density?
Blizzard [7]

Answer:

0.055g/mL

Explanation:

Data obtained from the question include:

Molar Mass of the gass sample = 71g/mol

Volume of the gas sample = 1300 mL

Density =?

The density of a substance is simply mass per unit volume. It is represented mathematically as:

Density = Mass /volume.

With the above equation, we can easily obtain the density of sample of gas as illustrated below:

Density = 71g / 1300 mL

Density = 0.055g/mL

Therefore, the density of the gas sample is 0.055g/mL

6 0
3 years ago
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