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2 years ago

Which layer is the oldest layer? How can you tell?

Chemistry

2 answers:

Neporo4naja [7]2 years ago

6 0

Answer:

The principle of superposition states that the oldest rock units are at rock bottom , and therefore the youngest are at the highest . Based on this, layer C is oldest, followed by B and A. So the full sequence of events is as follows: Layer C formed.

Explanation:

aleksley [76]2 years ago

3 0

Answer:

the lowest one

the same way when you are stacking plates the oldest one is at the bottom and the most recently stacked one is at the top

Explanation:

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An element forms an oxide, E₂O₃, and a fluoride, EF₃.(a) Of which two groups might E be a member?

Fittoniya [83]

a) The E might belong to group 13.

As the formula of a chemical compound is derived by the cross multiplication of the valency of the atoms. As formula of the given oxide is and valency of O atom is -2, therefore valency of element E must be +3 in order to obtain E2O3.

Also, in EF3, the valency of E will be +3 because there are three atoms of fluorine who has an individual valency of -1. Thus, e will have the valency of +3.

The Group 13 is the boron group which has the following elements:

Boron
Aluminium
Gallium
Indium
Thallium

All these elements have the valency of +3.

To know more about Valency, refer to this link:

brainly.com/question/12717954

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8 0

1 year ago

What is the frequency of a red light with a wavelength of 6.98 x 10^-6

nevsk [136]

Answer:

frequency of light = $4.2\times 10^{-13}$

Explanation:

we know that relation between frequency and wavelength of light is

frequency × wavelength = speed of light.

therefore frequency = $\frac{c}{wavelength}$

= $\frac{3\times 10^{8}}{6.98\times 10^{-6}}$

= $4.2\times 10^{-13}$

4 0

2 years ago

Which of the following is an adaptation found in many desert plants? A. large, flat leaves B. dormant period during the winter C

frosja888 [35]

I'd say the answer is D because they need to intake and keep as much water as possible.

4 0

3 years ago

Read 2 more answers

If you found carbon 13 atom, you would know that

bearhunter [10]

The Options are as follow,

a. it has 13 protons c. it has 13 neutrons

b. it has 13 electrons d. it has 7 neutrons

Answer:

Option-d is the correct answer.

Explanation:

As we know that C-13 has a atomic mass of 13. Also, atomic mass is given as,

Atomic Mass = # of Protons + # of Neutrons --- (1)

Since;

Atomic Mass = 13

And,

# of protons = 6 (as number of protons = atomic number)

Putting values in equation 1,

13 = 6 - # of Neutrons

Solving for Number of Neutrons,

# of Neutrons = 13 - 6

# of Neutrons = 7

3 0

2 years ago

For the reaction: 3 KClO3 to 3 KCL + 4O2, How many miles of potassium chloride are produced from 9.3 grams of potassium chloride

Valentin [98]

5.7 g of KCl is produced.

Explanation:

First we have to write the balanced equation as,

$2 K C l O_{3} \rightarrow 2 K C l+3 O_{2} \uparrow$

Then we have to find the moles of potassium chlorate as,

$Moles of $K C l O_{3}=9.3 g$ of $K C l O_{3} \times \frac{1 \text { mol of } K C l O_{3}}{122.55 g K C l O_{3}}=0.076$ moles$

Then we have to find the moles of KCl as,

$Moles of $\mathrm{KCl}=0.076$ moles of $\mathrm{KClO}_{3} \times \frac{2 \text { mol of } \mathrm{KCl}}{2 \text { mol } \mathrm{KClo}_{3}}=0.076$ moles$

From the moles of KCl, we have to find the mass using its molar mass by multiplying them as,

$\text { Mass of } \mathrm{KCl}=0.076 \text { mol } \times 74.55 \frac{g}{\mathrm{mol}}=5.7 \mathrm{g} \text { of } \mathrm{KCl}$

3 0

2 years ago

Which layer is the oldest layer? How can you tell? ​

Which layer is the oldest layer? How can you tell?