CHEMISTRY MIDDLE SCHOOL

Can you put this in order from least to greatest for me

{335 B.C. 430 B.C. 400 B.C.}

Answers

Answer 1
Answer: First it's 335 B.C. , next it's 400 B.C. , then lastly it's 430 B.C.  

The same way you put this in order from "least to greatest" ... It's just like Mathematics terms of "least to greatest" .. Just with 'B.C.' added to it 

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1.What are pollen grain? 2. what is an embryo?
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Answer: 2= baby being developed= embryo 1 i dont know sorry

Explanation:

Answer:

Pollen grains is the Male reproductive organ.

An embryo is a zygote.

Explanation:

What is Hund’s Rule?

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every orbital in a subshell is singly occupied with one electron before anyone orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin.

Whitch of following are the raw materials of photosynthesis

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How do gases from the air help break down rocks?

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Some rocks are sedimental. They are soft. Rocks are made out of gases etc. So some of the gas in the air makes a reaction with the rock which helps break the rock down.
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Which is an example of an organism? A. an octopus B. sand granules C. water D. the colors of a feather

Answers

A. An octopus

An organism is an individual animal, plant, or single-celled life form.

The octopus is the only living thing listed so that is why it is the example of an organism

1. In this investigation you will use a Mohr pipette to measure volume. Mohr pipettes use initial and final readings to determine the volume delivered. Explain how to avoid bias in the volume readings.2. You will be preparing a standard solution by mixing two solutions: 0.200 M Fe(NO3)3 and 0.00200 M KSCN. The concentration of the M Fe(NO3)3 solution is 100 times greater than the concentration of KSCN solution. What is the purpose of using a large concentration of Fe(NO3)3 and a small concentration of KSCN to make the standard solution? Explain.

Answers

Answer:

(a) Avoid parallax error

(b) To ensure that almost all the SCN⁻ has reacted.

Explanation:

(a) Avoiding bias

A Mohr pipet is a graduated pipet. To avoid bias, you should always hold the pipet so the meniscus is at eye level.

If your eye is above or below the meniscus, you will get an incorrect reading of the volume.

(b) Excess Fe³⁺

I am guessing that you are adding different volumes of SCN⁻ to Fe³⁺ to generate a Beer's Law plot of the concentration of FeSCN²⁺.

The problem is that the reaction is an equilibrium  It does not go to completion.

Fe³⁺ + SCN⁻ ⇌ FeSCN²⁺

You use a large excess of Fe³⁺ to drive the position of equilibrium to the right and make sure that almost all the added SCN⁻ is converted to FeSCN²⁺.
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