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4 years ago

How does air pressure changes with altitude - the distance from the surface

2 answers:

8 0

Answer:At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels. ... Since more than half of the atmosphere's molecules are located below an altitude of 5.5 km, atmospheric pressure decreases roughly 50% (to around 500 mb) within the lowest 5.5 km.

Explanation:brainliest plz

Misha Larkins [42]4 years ago

5 0

Answer:

What is that?

Explanation:

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When the ventricles contract, blood is pumped

pantera1 [17]

Answer:

it is a because blood is pumped but heart so the answer is A

4 0

3 years ago

Arrange the following elements in order from lowest to highest first ionization energy : , Ar , Cs, Na *

Sauron [17]

Lowest Cs, Na, highest is At

6 0

3 years ago

Read 2 more answers

Read that From picture and tell me the answer please

Dafna11 [192]

Answer:

1g Hydrogen

Explanation:

<h3>Getting to the equation:</h3>

Calcium in water reacts vigorously to give a cloudy white Precipitate (compound) called Calcium hydroxide alongwith the evolution of Hydrogen gas.

$\boxed{ \mathsf{Ca + H_2O \rightarrow Ca(OH)_2 + H_2}}$

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

<h3>Balancing the equation: </h3>

This reaction is not in it's balanced form! The number of atoms of Hydrogen on the left is 2 while that on the right is 4,I.e.,they're not equal.

Adding a 2 in front of H2O solves the problem by making the number of atoms of each element on both the sides equal.

$\mathsf{Ca +2 H_2O \rightarrow Ca(OH)_2 + H_2}$

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

<h3>Observations:</h3>

Looking into the equation more carefully, we see:

1 atom of Calcium reacts with 2 molecules of water to give 1 molecule of Calcium Hydroxide alongwith 1 molecule of Hydrogen gas.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

<h3>Gram atomic and molecular masses </h3>

Mass of one atom of Calcium = it's gram atomic mass

= 40 g

Mass of one "molecule" of Hydrogen

= it's Gram molecular mass

= gram mass of one atom × number of atoms in one molecule

= 1 × 2

= 2 g

So,

according to our observation:

One atoms of Calcium gives one molecule of Hydrogen (during the particular reaction)

=> 40g of Calcium gives = 2g of Hydrogen

•°• 1 g of Calcium gives = $\frac{2}{40}$

= $\frac{1}{20}$ g Hydrogen

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<h3>Answer:</h3>

We're provided with 20g of Calcium,

=> 20g of Calcium gives = 20 × $\frac{1}{20}$ g H2

= 1 g H2

_______________

Hope this helps!

6 0

3 years ago

What is the key difference between element and compound

olga nikolaevna [1]

Answer and Explanation:

DIFFERENCE BETWEEN ELEMENT AND COMPOUND :

An element is made up of same type of atoms whereas a compound is made up of different type of atoms.
A compound can be separated by chemical methods but an element can not be separated by chemical methods.
Example of element is Cu Fe C and example of compound is $CO_2\ NO_2 \ NH_3$ etc
Elements can not be split into different substances but compound can be splited into different substances

3 0

3 years ago

A nursing instructor is teaching about pharmacological treatments for attention-deficit/hyperactivity disorder (ADHD). Which inf

pashok25 [27]

Answer:

The possible numerous

side effects of atomoxetine.

Explanation:

The side effects of atomoxetine are numerous and so it should be included in the lesson plan.

Side effects like Stomach upset, nausea, vomiting, constipation, tiredness, loss of appetite/weight loss, dry mouth, dizziness, drowsiness, trouble sleeping, or decrease in sexual ability/desire may occur.

Also,increased blood pressure, difficulty urinating, fainting,liver damage, abdominal pain, heart attack, stroke.

5 0

3 years ago