Why is it important to keep good records during a scientific investigation?

Chemistry

1 answer:

love history [14]3 years ago

5 0

Answer:

everything needs to be documented in case you need to come back to it and to have evidence for yourself and others. as they say if it is not documented it wasn't done

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How can we identify that the absorption of heat has occurred?

loris [4]

Answer:

rise in temperature and the effect it has on our global weather patterns

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2 years ago

Sodium chloride is an ionic compound. If you drop a large crystal of sodium chloride on a hard floor. Choices are change to gas,

natita [175]

Shatter into tiny pieces

The crystal may break due to the fall.

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3 years ago

The number 40 in the name calcium-40 represents

strojnjashka [21]

Answer:

A. the atomic number

Explanation:

It is a member of the alkaline earth family of metals with the atomic symbol Ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth.

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Why are metal containers not used for storing acids

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Answer : Metal containers are not used for storing acid because most of the time acid reacts with almost every metal and produces salts or oxides which alters the acid characteristics making it useless .......

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2 years ago

Which isotope in each pair is more stable? Why?(d) ¹⁴₇N or ¹⁸₇N

quester [9]

¹⁴₇N is the more stable isotope

<h3>Briefly explained</h3>

We have ¹⁴₇N which has a neutron to proton ratio of one, and we look at ¹⁸₇N which has a neutron to proton ratio of 1.57 Again, you look at table 24 to and you see the atomic number of seven and there is really no stable isotope. It has any more than 10 neutrons.

When we have eight, protons will go down seven protons. There's really nothing stable that has more than maybe eight neutrons. So the fact that we have 11 neutrons with ¹⁸₇N suggests that this is very unstable and

¹⁴₇N is the stable isotope of the pair.

<h3>Stable and Unstable Nuclei</h3>

An atom is electrically neutral. It contains an equal number of positively charged protons and negatively charged electrons and their charges balance. The nucleus however contains only positively charged protons which are closely packed together in a very small volume (remember neutrons have no charge).

From the laws of physics (Coulomb’s Law) one would expect that the protons being of the same charge and so close together would exert strong repulsive forces on each other. The combined gravitational force from the protons and neutrons in a nucleus is insignificant as an attractive force because their masses are so tiny.

This implies there must be an additional attractive force similar in size to the electrostatic repulsion which holds the nucleus together.

Learn more about stable and unstable nuclei

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1 year ago