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3 years ago

11

Please help....... what should I do in order to study effectively?

1 answer:

Maurinko [17]3 years ago

7 0

1) Find a good studying spot.
2) Stay Away From Your Phone or any other things that distract you.
3) Take a break after about 1-1 hour 30 minutes- break should be about 10 minutes.
4) make sure notes are complete for what you are revising for.
5) watch videos/ use class notes/ your own notes/ revision guides.
6) test yourself by answering exam style questions or by flash cards.

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Can someone help me out with this?

ycow [4]

Answer:

2.8 * 10^(-6) / 1.4 * 10^(-2)=

2* 10^(-8)

4 0

3 years ago

A gas has a volume of 20.0 L at a pressure of 950 mmHg with a temperature of 125.0 o If the conditions are changed to STP, what

ehidna [41]

Use formula: Initial Pressure x Initial Volume/Initial temperature = Final pressure x Final Volume/Final Temperature => 17.15L

6 0

3 years ago

How many moles of tin atoms are there in 250 grams of tin?

joja [24]

250gTi x (1mol/47.87 [molar mass]) =5.22247 moles

4 0

3 years ago

Two protons and two neutrons are released as a result of this reaction.

Murljashka [212]

<u>Answer:</u> The particle released in the given reaction is one alpha particle

<u>Explanation:</u>

In a nuclear reaction, the total mass and total atomic number remains the same.

For the given fission reaction:

$^{222}_{86}\textrm{Rn}\rightarrow ^A_Z\textrm{X}+^{218}_{84}\textrm{Po}$

<u>To calculate A:</u>

Total mass on reactant side = total mass on product side

222 = A + 218

A = 4

<u>To calculate Z:</u>

Total atomic number on reactant side = total atomic number on product side

86 = Z + 84

Z = 2

The isotopic symbol of unknown element is $_{2}^{4}\textrm{He}$ . Another name of helium atom is alpha particle.

Hence, the particle released in the given reaction is one alpha particle

3 0

3 years ago

Read 2 more answers

In an electrically neutral atom of any element, there are equal numbers of

Masteriza [31]

Answer:

B. electrons and protons.

Explanation:

In an electrically neutral atom of any element, there are equal number of protons and electrons in the atom.

Protons are the positively charged particles in an atom.

Electrons are the negatively charged particles within the atom.

When the number of protons and electrons are the same or equal, the atom is neutral.

But when there is an imbalance, an ion results.

8 0

3 years ago