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3 years ago

Cos(A)+cos(2A)+cos(3A)=0 is not an identity

Chemistry

1 answer:

guajiro [1.7K]3 years ago

3 0

Answer:

this is the required answer look it once

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Question 15 of 25

Monica [59]

Answer:

(C). Mg(s) | Mg2+(aq) Au+(aq) | Au(s)

4 0

3 years ago

what is the relationship between the scale divisions marked on the graduated cylinders and the estimated uncertainty in the volu

AURORKA [14]

Answer:

The relationship between the scale divisions marked on the graduated cylinders and the estimated uncertainty in the volume measurements is that the larger the divisions the larger the uncertainty, and the smaller the divisions the smaller the uncertaintity.

Explanation:

In general, graduated cylinders are marked with divisions (lines) at equal spaces or intervals. There are divisions that show the measure with a number and a series of intermediate not numbered divisions in between two numbered lines.

The uncertainty of the instrument is determined as half the difference between two consecutive marks.

So, the larger the interval of two consecutive marks the larger the uncertainty.

The attached image, taken from brainly.com/question/13102373, shows you some marks in a graduated cylinder.

7 0

3 years ago

Can you please help me ?

disa [49]

Answer:

6.82 moles of Fe2O3

Explanation:

Step 1:

Determination of the number of mole of in 450g of CO2.

This is illustrated below:

Molar Mass of CO2 = 12 + (2x16) = 44g/mol

Mass of CO2 = 450g

Number of mole of CO2 =.?

Number of mole = Mass/Molar Mass

Number of mole of CO2 = 450/44 = 10.23 moles

Step 2:

Determination of the number of mole of Fe2O3 needed for the reaction. This is illustrated below:

2Fe2O3 + 3C—> 4Fe + 3CO2

From the balanced equation above,

2 moles of Fe2O3 reacted to produce 3 moles of CO2.

Therefore, Xmol of Fe2O3 will react to produce 10.23 moles of CO2 i.e

Xmol of Fe2O3 = (2x10.23)/3

Xmol of Fe2O3 = 6.82 moles

Therefore, 6.82 moles of Fe2O3 is required.

3 0

3 years ago

SCIENCE Pls help I need this for science H. W

sweet [91]

Answer:

Its mee I miss you soo frickin muchh

3 0

3 years ago

What minerals and ores (in a mine) are pure substances mixtures and solutions?

klio [65]

Normally in a mine the ore thats extracteed is unpure and contains many impurities and so are usually compounds and so must be then processed to form pure elements
some elements can be extracted from a solution of its ions such as magnesium
hope that helps

6 0

3 years ago

Cos(A)+cos(2A)+cos(3A)=0 is not an identity​

Cos(A)+cos(2A)+cos(3A)=0 is not an identity