CHEMISTRY HIGH SCHOOL

Stars are formed from interstellar clouds because ofthe Law of Entropy
the Law of Universal Gravitation
the Law of Stellar Evolution
the Law of Propulsion

Answers

Answer 1
Answer: The answer is D. Stars are formed from interstellar clouds because of the Law of Universal Gravitation. The interstellar clouds are termed as nebula. When other stars dies a supernova occurs then the gravity from this pushes matter into the clouds until it cannot overcome the gravitational pull and it collapses which heats matter up forming a star.

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How much heat (in kJ) must be added to 1.34 kg of ice at O'C to convert it to water to
in a sample of silcon 92.21% of the atoms have a mass of 27.98 amu, 4.70% have a mass of 28.98 amu and 3.09% have a mass of 29.97 amu. what is ther average atomic mass of the sample? socratic.org socratic.org
The concentration of hydrogen peroxide (H2O2) can be determined by titrating it with an acidified MnO4− solution. The following is an unbalanced equation. MnO4− (aq) + H2O2 (aq) → O2 (g) + Mn2+ (aq)(a) Balance the above redox reaction.(b) Determine the concentration of H2O2 solution in molarity if 10.00 mL of this solution requires 20.00 mL of 1.5 M MnO4− for a complete reaction.

Within a particular compound, an atom gives up two electrons. This atom is A. part of a covalent compound.
B. positively charged.
C. negatively charged.
D. not part of an electrolyte.

Answers

Answer:

The correct answer is option B. positively charged.

Explanation:

Hello!

Let's solve this!

When an atom yields its electrons, it yields part of its negative charge. Therefore, it immediately transforms into a positively charged ion.

This positively charged ion is called cation.

We conclude that the correct answer is option B. positively charged.
Positively charged due to donating two electrons and becoming an ion.

How many total valence electrons take part in a triple bond between 2 atoms?

Answers

6, to do a single bond you need two singular valence electrons to create one bond. Therefore to create a triple bond you need 6 singular valance electrons.

Is zinc coMpund Plz help me​

Answers

Answer:

it is indeed a compound

Explanation:
Zinc is NOT a compound.

A compound contains two or more elements or molecules like H2O. Where H is 1 element and Oxygen is another and together they make a compound.

Zinc itself is a single molecule (or element) and can be used in a compound like ZnO (zinc oxide)

The Metal Wire In An Incandescent Lightbulb Glows When The Light Is Switched On And Stops Flowing When It Is Switched Off. This Simple Process Is Which Kind Of Change?

Answers

Answer: physical change

Explanation:

A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these changes

Example: Melting of ice

A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these changes.

Example: Corrosion of iron called as rusting.  

Thus when the metal wire in an incandescent light bulb glows when the light is switched on and stops flowing when it is switched off is just a physical change as there is no change in chemical composition.
Physical Change. If matter is not chemically changing, then its a physical change.

Mercury is often used as an expansion medium in a thermometer. The Mercury sits in a bulb on the bottom of the thermometer and rises up a thin capillary as the temperature rises. Suppose a Mercury thermometer contains 3.550 g of mercury and has a capillary that is 0.190 mm in diameter. How far does the Mercury rise in the capillary when the temperature changes from 0.0 degrees Celsius to 25.0 degrees Celsius? The density of Mercury at these temperatures is 13.596 g/cm^3 and 13.534 g/cm^3, respectively.

Answers

Just switch it to wumbo

How many molecules is 1.50 moles of CO2

Answers

Answer:

The answer to your question is 9.034 x 10²³ molecules

Explanation:

Data

number of molecules = ?

number of moles = 1.50

Process

To solve this problem, use Avogadro's number. This number relates 1 mol of a substance to 6.023 x 10²³ molecules.

                          1 mol of CO₂ ---------------  6.023 x 10 ²³ molecules

                          1.5 moles of CO₂ ----------   x

                                x = (1.5 x 6.023 x 10²³) / 1

                                x = 9.034 x 10²³ molecules
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Consider the following reaction: SO2Cl2(g)⇌SO2(g)+Cl2(g) A reaction mixture is made containing an initial [SO2Cl2] of 2.2×10−2M . At equilibrium, [Cl2]= 1.3×10−2M . Calculate the value of the equilibrium constant (Kc).