Scenario: (This is for questions 7-12)
One January day when it was 10 degrees F outside, an Uncle went to Safeway to collect a bouquet of balloons for his nieces birthday. He ordered a mix of latex balloons in various colors. He appreciated the warmth of the store. He watched the balloons get inflated and noticed they were full and taut with Helium. He took the balloons home. When he got to his nieces' house he noticed the balloons were sunk in and wrinkled and floating ½ way down to the floor of his car. He was so disappointed. He placed them in the back room until the party. The house was 74 degrees. The party began an hour later and when he went back into the room to retrieve the deflated balloons, much to his relief, they were full and taut as before. He wondered what could have caused this reversal?
Question:
What is your hypothesis as to why the Uncle saw these changes in the balloons?

Explanation:

Transition Metals are characterized by the filling of d orbitals?

Rate of reaction will decrease if there is an increase in product concentration.

If one (or more) of the reactants or products concentrations are raised, the equilibrium will change to lower the concentration. Alternately, if the temperature is lowered, the equilibrium will change to favor the exothermic process, which will raise the temperature.

Hence, there is decrease in rate of reaction as the product concentration increases.

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Answer:

There are 20 atoms in hydrogen.

Explanation:

Multiply Coefficient with Hydrogens subscript. In this case the coefficient is a 4 so you multiply that with Hydrogens subscript which is 5. So it would be (4)(5)=20

Answer:

The answer is 2.91 atm

Explanation:

Answer:

C. A long chain of carbon atoms with hydrogen atoms attached to them

Explanation:

For example, the main component of flour is starch and starch is a polymer.

Now, Starch is a polymeric carbohydrate that consists of a large number of glucose units which are bonded by chemical bonds known as glycosidic bond. It's also known that Starch is a white, tasteless and odorless powder that is not soluble in alcohol or even cold water.

Thus, we can say that polymer is a long chain of carbon atoms with hydrogen atoms attached to them.

Option C is correct.

Answer:

C. A long chain of carbon atoms with hydrogen atoms attached to them

Explanation:

For example, the main component of flour is starch and starch is a polymer.

Now, Starch is a polymeric carbohydrate that consists of a large number of glucose units which are bonded by chemical bonds known as glycosidic bond. It's also known that Starch is a white, tasteless and odorless powder that is not soluble in alcohol or even cold water.

Thus, we can say that polymer is a long chain of carbon atoms with hydrogen atoms attached to them.

Answer:

B Hydrogen

Explanation: Hydrogen is the smallest element.

Answer:

Explanation:C

Answer:

His speed was 2 m/s, and his velocity was 0

Explanation:

In physics, speed of an object is defined as the change in position with the change in its time. While velocity may be defined as the change in the position of the body with respect to the time taken.

Speed in a scalar quantity which means it has only magnitude while velocity has both magnitude and direction.

To determine change in velocity both direction as well as magnitude has to be changed.

In the context, Kai was 200 m of the library in the north direction. Now for the round trip to the library and back to his position, Kai took 200 seconds time to cover the distance.

So for the round trip, the speed of Kai would be 2 m/s abut the velocity of Kai is 0 as the displacement of Kai is 0.

Answer:

speed  2 m/s, his velocity  0

: B

Answer:

2. Air is not a pure substance

Explanation:

Air does not have a chemical symbol or formula because air is not a pure substance (option 2).

Air is a mixture of different gases. A mixture is a substance that constitutes other compounds that are not chemically bonded together.

This means that air as a mixture is made up of different gaseous components that possess their own individual identity.

Atmospheric air is composed of the following different constituents;

This shows that air is not a pure substance and accounts for the reason why air does not have a definite chemical formula or symbol.

Therefore, option 2 is correct.

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Answer: B

Explanation: I just took the quiz :)

Taking into account the reaction stoichiometry, 47.655 grams of Cu is required to react with 2 moles of HNO₃.

In first place, the balanced reaction is:

3 Cu + 8 HNO₃  → 3 Cu(NO₃)₂ + 2 NO + 4 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 8 moles of HNO₃ react with 190.62 grams of Cu, 2 moles of HNO₃ react with how much mass of Cu?

[tex]mass of Cu=\frac{2 moles of HNO_{3} x190.62 grams of Cu}{8 moles of HNO_{3} }[/tex]

mass of Cu= 47.655 grams

Finally, 47.655 grams of Cu is required to react with 2 moles of HNO₃.

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Answer:

D

Explanation:

tropical areas receives the most solar radiation because the sun's rays are nearly perpendicular to the earths surface

Answer:

Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level. This is the most stable arrangement of electrons, so noble gases rarely react with other elements and form compounds.

Explanation:

Answer:

4.8x10^9

Explanation:

Answer:

B) The Metal A ion is reduced and Metal B is oxidized.

Explanation:

When we think of electroplating, we often think of a set up in which there is a nonsponteanous reaction driven by the presence of a cell.

However, in displacement plating, a cell is not involved. Metals are chosen based on their respective position in the electrochemical series.

For instance, silver can be coated on copper by immersing the copper rod into a silver ion solution. The copper rod becomes oxidized. The silver ions accept electrons and become deposited on the copper rod.

Mass of Lithium = 1443.73 g ≈ 1.4 kg

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

The number of atoms of Li = N=1.25 x 10²⁶

mol Li(n) :

[tex]\tt n=\dfrac{N}{No}\\\\n=\dfrac{1.25\times 10^{26}}{6.02\times 10^{23}}\\\\n=2.08\times 10^2[/tex]

mass Li (Ar=6.941 g/mol)

[tex]\tt mass=mol\times Ar\\\\mass=208\times 6,941\\\\mass=1443.73~g[/tex]

Explanation:

Components that throughout chemical processes appear to acquire electrons to achieve anions are considered non-metals. These were all elements which are electronegative. Those who are – anti conductors of electricity and heat, fragile and disadvantaged.

Explanation:

convergent-plate slides beneath the other

divergent-plates move away from each other

transform-2 plates slide past each other

Answer:

the case of a wave, the speed is the distance traveled by a given point on the wave (such as a crest) in a given interval of time. In equation form, If the crest of an ocean wave moves a distance of 20 meters in 10 seconds, then the speed of the ocean wave is 2.0 m/s.

Explanation:

Answer:

The volume of CO₂ produced is 8.4 L

Explanation:

The mass of propane in the reaction C₃H₈ = 20 grams

The mass of, oxygen, O₂ in the reaction = 20 grams

The produce of the reaction are carbon dioxide, CO₂ and water, H₂O

The balanced equation of the (combustion) reaction can be presented as follows;

C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g)

Therefore, one mole of propane, C₃H₈, reacts with five moles of oxygen, O₂, to produce three moles of carbon dioxide, CO₂, and four moles of water molecules, H₂O, as steam

The number of moles = Mass/(Molar mass)

The molar mass of propane, C₃H₈ = 44.1 g/mol

The number of moles of propane in 16 grams of propane = 16/44.1 ≈ 0.3628 moles

The molar mass of oxygen, O₂ = 32.0 g/mol

The number of moles of oxygen in 20 grams of propane = 20/32 ≈ 0.625 moles

Therefore;

Given that 1 mole of C₃H₈ reacts with 5 moles of O₂

1 mole of O₂ will react with 1/5 moles of C₃H₈

0.625 moles of O₂ will react with 0.625/5 = 0.125 moles of C₃H₈ to produce 3 × 0.125 = 0.375 moles of CO₂

1 mole of an ideal gas occupies 22.4 L at standard temperature and pressure

Taking CO₂ as an ideal gas, we have;

0.375 mole of CO₂ will occupy 0.375 × 22.4 L = 8.4 L

Therefore, the volume of CO₂ produced = The volume occupied by the 0.375 moles of CO₂ = 8.4 L.

Answer:

i think it is b im not sure

Explanation:

Answer:

i think 50%

Explanation:

The statement " an electrolytic solution, because NaOH will dissociate into ions" is correct.

A solution that contains ions, atoms, or molecules that already have gained or lost electrons and also is electrically conductive is known as an electrolyte solution. They're known as ionic solutions because of this.

NaOH can be considered as electrolyte because sodium hydroxide was soluble in water, it will entirely dissociate into its ions. As a result, it can classify NaOH as a strong electrolyte. When electrolytes are dissolved in water, they form a solution that conducts electricity.

The reaction can be written as:

NaOH (s) + [tex]H_{2}O[/tex] → [tex]Na^{+} +OH^{-} +H_{2}O[/tex]

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Answer:

a) Hydrogen and Fluorine

b) Lithium and Oxygen

c) Potassium and Phosphorus

d) Nickel and Oxygen

e) Mercury and Chlorine

Explanation:

The capital letters in the compounds represent a single element, while some elements have one capital letter and one small letter after it.

a) H & F

b) Li & O

c) K & P

d) Ni & O

e) Hg & Cl

Answer:2...concentration of Hydrogen ions is 10 times more

Explanation:

Answer:

goggles

Explanation:

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