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3 years ago

Select the correct answer.

2 answers:

4 0

D.) black text on a yellow background. There is much more contrast in the colors black and yellow than the other choices.

Igoryamba3 years ago

4 0

D black text on yellow background

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Why do igneous rocks not contain fossils in them ?

Mashutka [201]

Answer:

Igneous rocks do not contain any fossils.

Explanation:

This is because any fossils in the original rock will have melted when the rock melted to form magma. Sedimentary rocks are formed from the broken remains of other rocks that become joined together.

6 0

3 years ago

Calculate the volume, in milliliters, of a 0.211 M solution of NaOH that will completely neutralize each of the following. 2.30

xenn [34]

Answer:

$V_{base}=17.9mL$

Explanation:

Hello,

In this case, as the reaction between sodium hydroxide and sulfuric is:

$2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O$

We can notice a 2:1 molar ratio between the base and the acid, for that reason for the titration at the equivalence point we find:

$n_{base}=2*n_{acid}$

Which in terms of concentrations and volumes is:

$M_{base}V_{base}=2*M_{acid}V_{acid}$

In such a way, solving for the required volume of base we find:

$V_{base}=\frac{2*M_{acid}V_{acid}}{M_{base}} \\\\V_{base}=\frac{2*0.820M*2.30mL}{0.211M}\\ \\V_{base}=17.9mL$

Best regards.

7 0

3 years ago

Con los siguientes elementos: 37Rb 33As 52Te 1H 8O 56Ba 53I forme seis compuestos con enlace iónico. Debe hacer la representació

elena-14-01-66 [18.8K]

Los electrones los representa Lewis

8 0

4 years ago

HELPP PLEASEEE I REALLY NEED IT!!!!!!!!

SSSSS [86.1K]

Answer:

Americium is: [Rn]5f^7s^2

Bismuth is: [Xe]6s^24f^145d^106p^3

Tin is: [Kr]4d^105s^25p^2

Vanadium is: [Ar]3d^34s^2

Aluminum is [Ne]3s^23p^1

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3 years ago

Your body contains vast numbers of carbon atoms. How is it possible that some of these carbons may have been part of the body of

charle [14.2K]

Carbon is reused through the carbon cycle.

There is carbon in oil, which is made of ancient animals, and this carbon is discharged into the air during ignition.

Carbon is then taken in by plants as CO2, which we then eat.

<u>Explanation</u>:

Carbon is reused through the carbon cycle. There is carbon in oil, which is made of ancient animals, and this carbon is discharged into the air during ignition. Carbon is then taken in by plants as CO2, which we then eat.

Matter carries on as indicated by the guideline of conservation of matter: Under conventional conditions, any matter is neither made nor destroyed but instead is reused again and again. It tends to be changed or recombined, however, it doesn't vanish; everything heads off to someplace.

Carbon particles of my body presumably used to be a piece of the body of a prehistoric creature, as chemical components have been utilized and reused by living animals.

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3 years ago