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beks73 [17]
4 years ago
14

True or false: scientists make observations very carefully science

Chemistry
2 answers:
posledela4 years ago
8 0
True hope this helped u
Olenka [21]4 years ago
3 0
True, scientists do make observations very carefully.
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Prepare a flow sheet for the preparation of triphenylmethanol. Using your knowledge of the physical properties of the solvents,
sasho [114]

Answer:

See explanation and Image attached

Explanation:

The preparation of triphenylmethanol occurs as shown in the image attached to this answer.

The first step is the nucleophillic reaction of the phenyl magnesium bromide with the carbonyl group.

Reaction of the second molecule of phenyl magnesium bromide with the product yields triphenyl methoxide ion. Reaction with acid yields the triphenylmethanol product which is extracted into the organic phase.

The triphenylmethanol product can be purified by recrystallization.

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How does the mass of and distance between the Sun and the Earth impact the number of days in a year?
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Answer:

Gears A and B work together. Gear A turns 30 times when Gear B turns 45 times. When Gear B turns 12 times, how many times does Gear A turn?

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3 years ago
Which characteristic of water helps it form strong bonds with other water molecules?
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Answer:

The correct answer is Polar structure. See the explanation below, please.

Explanation:

The water molecule is formed by the union of an oxygen atom (O) to two hydrogen atoms (H), forming at an angle of 105 °, having the negative electron density over the O and positive over the H. The water due to its polarity can interact with other equal molecules, by hydrogen bridge (occurs between the atom of H and an electronegative element, in this case the O). It corresponds to a type of dipole-dipole interaction.

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3 years ago
What is the Bronsted-Lowry definition of an acid?
Nastasia [14]

Answer:

A)A compound that donates protons

Explanation:

for B it is the defination of bases

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3 years ago
During radioactive decay, the __________ isotope decays into a ____________ isotope that has a different ___________________ num
SVETLANKA909090 [29]

Answer: Please find answer in explanation column

Explanation:

During radioactive decay, the __unstable ________ isotope decays into a _stable ___________ isotope that has a different ____proton _______________ number

Or

During radioactive decay, the _ unstable parent nuclide ________ isotope decays into a _stable daughter nuclide ___________ isotope that has a different ____proton _______________ number.

There are 3 types of radioactive decay;alpha, beta and gamma, Of which the above clearly explains the beta decay. In beta decay, the unstable isotope having excess neutrons  will undergo a beta decay emitting a beta particle.( ⁰₋₁e) causing the nucleus to loose a neutron but gain a proton.

Some heavy unstable isotopes which undergo radioactive (beta decay ) to become stable isotopes  are phosphorus-32, strontium-90, iodine-131

Using Strontium 90 as an example , we have

⁹⁰₃₈St ----->⁹⁰₃₉Y + ⁰₋₁e

Strontium an unstable isotope undergoes a beta radioactive decay to form Yttrium.

 

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3 years ago
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