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3 years ago

Which statement describes how the angle of insolation affects different areas of Earth?

Chemistry

2 answers:

Anastasy [175]3 years ago

8 0

Answer:

The area near the equator is warmer than the area near the pole

Explanation: pls mark me the brainlyest

irina [24]3 years ago

7 0

Answer:

The area near the equator is warmer than the area near the pole.

Explanation:

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The mass percent of carbon in a typical human is 18%, and the mass percent of 14C in natural carbon is 1.6 × 10-10%. Assuming a

Tema [17]

Answer:

4066 decay/s

Explanation:

Given that:-

The weight of the person is:- 190 lb

Also, 1 lb = 453.592 g

So, weight of the person = 86182.6 g

Also, given that carbon is 18% in the human body. So,

$\%\ Carbon=\frac{18}{100}\times 86182.6\ g=15512.868\ g$

Carbon-14 is $1.6\times 10^{-10}\ \%$ of the carbon in the body. So,

$\%\ Carbon-14=\frac{1.6\times 10^{-10}}{100}\times 15512.868\ g=2.48\times 10^{-8}\ g$

Also,

14 g of Carbon-14 contains $6.023\times 10^{23}$ atoms of carbon-14

So,

$2.48\times 10^{-8}\ g$ of Carbon-14 contains $\frac{6.023\times 10^{23}}{14}\times 2.48\times 10^{-8}$ atoms of carbon-14

Atoms of carbon-14 = $1.07\times 10^{15}$

Given that:

Half life = 5730 years

$t_{1/2}=\frac {ln\ 2}{k}$

Where, k is rate constant

So,

$k=\frac {ln\ 2}{t_{1/2}}$

$k=\frac{ln\ 2}{5730}\ years^{-1}$

The rate constant, k = 0.00012 years⁻¹

Also, 1 year = $3.154\times 10^7$ s

So, The rate constant, k = $\frac{0.00012}{3.154\times 10^7}$ s⁻¹ = $3.8\times 10^{-12}\ s^{-1}$

Thus, decay events per second = $K\times atoms decayed$ = $3.8\times 10^{-12}\times 1.07\times 10^{15}\ decay/s$ = 4066 decay/s

4 0

3 years ago

An atom that has 13 protons and 15 neutrons is an isotope of the element? How can I count it?

Diano4ka-milaya [45]

It's simple.
the number of protons in an atom never changes. And also, the no of protons is its atomic number.if you look up the periodic table, you will find a number on the top - left corner of each of the boxes. This is the atomic number.No 2 same elements on the periodic table have the same atomic number. So, all you have to do is search for a box that has the number 13 on it.

and by the way ... the element which you're searching for is Aluminium

7 0

3 years ago

Identify the type of reaction and then balance the equation for each of the following reactions.

alexgriva [62]

Answer:

The answer to your question is below

Explanation:

There are 4 types of chemical reactions:

- Synthesis is when two elements or compounds form only one compound.

- Decomposition is when 1 compound is broken into 2 or more products.

- Single replacement is when one element is replaced by another element.

- Double replacement is when the cations of two compounds are interchanged.

1.- Decomposition 2 Al₂O₃ ⇒ 4 Al + 3O₂

2.- Single replacement Mg + 2HNO₃ ⇒ Mg(NO₃)₂ + H₂

3.- Combustion 2C₆H₆ + 15O₂ ⇒ 12CO₂ + 6H₂O

4.- Synthesis 2Ag + S ⇒ Ag₂S

5.- Double replacement 3Ca(OH)₂ + 2H₃PO₄ ⇒ Ca₃(PO₄)₂ + 6 H₂O

6 0

3 years ago

838th

dangina [55]

Answer:

Different liquid

Explanation:

<em>The independent variable in the investigation is the different liquid given to the plants.</em>

<u>The independent variable in an experimental investigation is the variable that is supplied by the researcher which directly affects the main variable being measured during the investigation. In other words, the independent variable is a variable that directly affects the dependent variable.</u>

In this case, the dependent variable would be growth determining factors in plants such as height, biomass, number of leaves, etc. while the independent variable would be the different types of liquid given to the plants.

5 0

3 years ago

The volume of oxygen gas changed from 10 ml to 11 ml as the temperature changed. is this a chemical change or a physcial change

Effectus [21]

It's physical change, because only the volume of oxygen changed (no new substance are formed).

:•)

5 0

3 years ago