HELPP ANSWERSSS!!!!

When writing a PSA, it is not necessary to brainstorm because you already have all of the information from your persuasive essay

Sergio [31]

YES it is very important to brainstorm

8 0

3 years ago

What does the direction and length of velocity vector indicate

I am Lyosha [343]

A Velocity Vector represents the rate of change of the position of an object. The Magnitude of a Velocity vector gives the speed of an object while the vector direction gives its direction.

5 0

3 years ago

How is the periodic table constructed ?

jasenka [17]

Before the periodic table, there were a bunch of symbols, number, letters etc (In all kinds of languages) that represented the elements. Scientists around the world saw that a chart of the elements needed to be universally accepted and finalized. A guy named Mendeleev presented this idea to the scientific community. Mendeleev was also the first to order elements according to atomic number rather than atomic weight. The modern day periodic table was not published by him, it was developed with the help of the entire scientific community. Honestly, there isn't a specific way to tell you how the periodic table was constructed, scientists developed thousands of tables that represented the elements. And just to let you know, the modern day periodic table is constantly going through changes as we discover more and more about elements, atoms, molecules etc. so in the near future it wouldn't be surprising if we saw something completely different than what we see today.

6 0

3 years ago

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The mussel shells are eroding because the ocean is too acidic. More acidic oceans dissolve CaCO3 faster and change them into HCO

ahrayia [7]

This problem is providing information about possible causes whereby mussel shells are being eroded due to the acidity in the ocean. In such a way, it claims that more acidic oceans dissolve calcium carbonate in a faster way and produce hydrogen carbonate ions, and thus, a feasible explanation is required as well as a hypothesis according to the following choices:

a. Lower CO₂; this reduces the H₂CO₃ and increases the pH.

b. Add CO₃²⁻: this will add base and increase its concentration.

c. Add Ca²⁺: this will increase the precipitation rate of calcium carbonate (correct choice).

<h3>Equilibrium equations:</h3>

At first instance, we should recall the equilibrium equations that take place when acidic oceans dissolve calcium carbonate in a faster way:

$CaCO_3(s)\rightleftharpoons Ca^{2+}(aq)+CO_3^{2-}(aq)\\\\CO_3^{2-}(aq)+H^+(aq)\rightleftharpoons HCO_3^-(aq)$

$CO_2(g)+H_2O(l)\rightleftharpoons H_2CO_3(aq)$

<h3>Shifts from equilibrium:</h3>

Where we can see that the first choice is thoroughly discarded as the addition of CO₂ actually increases the ionizable carbonic acid (acidity). Moreover, the addition of CO₃²⁻ may also lead to the formation of more protons-releasing carbonic acid which also contributes to the acidity of the ocean.

<h3>Hypothesis:</h3>

Thereby, the correct condition that, for sure, contributes to the preservation of mussel shells will be the addition of Ca²⁺ and the hypothesis will be that it shifts the equilibrium towards the formation of more CaCO₃, the active compound in these shells.

Learn more:

Acidity in oceans: brainly.com/question/9751926
Solubility equilibrium: brainly.com/question/10760976

3 0

3 years ago

What is a forensic paleontologist?<br>dum it down for me

raketka [301]

Answer:

Simple Definition: A Tool for “Intelligence” and Investigation

Explanation:

Intelligence is the ability to acquire and apply knowledge and skills while investigation is the action of investigating something or someone; formal or systematic examination or research.

4 0

2 years ago

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