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2 years ago

Which of the following statements is true?

Chemistry

2 answers:

uysha [10]2 years ago

8 0

Answer:

Only one: the nucleus of an atom is made up of protons and neutrons.

Why others are false:

Boiling point of a substance is not dependent on the volume because it’s a intensive property.

During sublimation, a solid changes directly into gas.

Electrons orbit the nucleus of an atom in circular orbits (kinda unsure of this one.)

Explanation:

Kazeer [188]2 years ago

3 0

Only one: the nucleus of an atom is made up of protons and neutrons.
Why others are false:
Boiling point of a substance is not dependent on the volume because it’s a intensive property.
During sublimation, a solid changes directly into gas.
Electrons orbit the nucleus of an atom in circular orbits (kinda unsure of this one.)

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2. 27.8 mL of an unknown were added to a 50.0-mL flask that weighs 464.7 g. The total mass of the flask and the liquid is 552.4

agasfer [191]

Answer:

$d=4.24x10^{-4}\frac{lb}{in^3}$

Explanation:

Hello there!

In this case, according to the given information, it turns out firstly necessary for us to set the equation for the calculation of density and mass divided by volume:

$d=\frac{m}{V}$

Thus, we can find the mass of the unknown by subtracting the total mass of the liquid to the mass of the flask and the liquid:

$m=552.4g-464.7g=87.7g$

So that we are now able to calculate the density in g/mL first:

$d=\frac{87.7g}{27.8mL}=3.15g/mL$

Now, we proceed to the conversion to lb/in³ by using the following setup:

$d=3.15\frac{g}{mL}*\frac{1lb}{453.6g}*\frac{1in^3}{16.3871mL}\\\\d=4.24x10^{-4}\frac{lb}{in^3}$

Regards!

6 0

2 years ago

What is the “Island of Stability”?

3241004551 [841]

Answer:

The island of stability is a term from nuclear physics that describes the possibility of elements with particularly stable "magic numbers" of protons and neutrons. This would allow certain isotopes of some transuranic elements to be far more stable than others, that is, decay much more slowly.

Explanation:

7 0

2 years ago

Help meee, if u help me i give u a pizza :)

kompoz [17]

Give me 25 minutes and I’ll have the answers :)

6 0

2 years ago

How can you tell that a precipitate has formed?

ladessa [460]

Answer:

if a solid appears when mixing two liquids

Explanation:

i remember this question :D

7 0

2 years ago

Read 2 more answers

In each reaction box, place the best reagent and conditions from the list below.

Serggg [28]

This is a two step step reaction as shown below,

Step 1:
Epoxidation of Alkene:
In first step Cyclohexene is treated with peroxybenzoic acid in the presence of Dichloromethane which results in the formation of epoxide moiety.

Step 2:
Nucleophillic Substitution Reaction:
In second step the epoxide formed is treated with Sodium Methoxide which acts as a nucleophile and attacks the less hindered carbon of epoxide resulting in the formation of final product as shown below.

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2 years ago