Reactions
Predict the products for the single replacement reactions given. Check to see that the equations are
balanced.
Ca + MgCl2 →?
-
O CaCl2 + Mg
O Ca + Cl2
0 Mg + Cl2
CaCl + Mg

[tex]\tt \dfrac{7.5}{12}\times 100=62.5~ml[/tex]

The final temperature of the sample of gas is 689.65 Kelvin.

Relation between the temperature and pressure will be represented by the ideal gas equation PV = nRT, and for this question required equation is:

P₁/T₁ = P₂/T₂, where
P₁ & T₁ are the pressure and temperature of the initial sample.

P₂ & T₂ are the pressure and temperature of the final sample.

Pressure is in mmHg and on putting values from the question on the above equation, we get

T₂ = (810)(390.8) / (760) = 416.5 degree C = 689.65K

Hence required temperature of the sample is 689.65K.

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Answer:

genes (c)

Explanation:

since traits are passed down genetically, so her mother or father must have one (or even one of her grandparents)

hope this helps!:)

Answer: D.

Explanation:looks right to me it’s for sure not A hope did helped

Moles are the divisional of the mass and the molar mass. In 13.95 gms of calcium, there are 0.348 moles.

In chemistry, moles are the measurement units that are used to estimate the small entities of the atoms or the molecules. Moles are calculated as:

Moles = mass ÷ molar mass

We know,

The molar mass of calcium = 40 gm/mol

The mass of calcium = 13.95 gms

Moles of calcium are calculated as:

Moles = 13.95 ÷ 40

= 0.348 moles

Therefore, in 13.95 gms 0.348 moles of calcium is present.

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From the calculations, we can see that the pH of the solution is 2.3

The term Kb is know as the base dissociation constant. It gives the extent to which a base dissociates in solution.

Hence;

Ka = Kw/Kb = 1 * 10^-14/ 9.88 x 10-8 = 1 * 10^ -7

We have to set up the ICE table;

       NH4^+(aq) + H2O(l)⇔ H3O^+(aq) + NH3(aq)

I        2.55                               0                   0

C        -X                                  +X                 +X

E       2.55 - x                            x                   x

Ka = [H3O^+] [NH3]/[NH4^+]

1 * 10^ -7 = x^2/2.55 - x

1 * 10^ -7 (2.55 - x) = x^2

x^2 - 2.55 * 10^ -7 + 1 * 10^ -7x = 0

x=0.0005 M

So;  [H3O^+] = [NH3] = 0.0005 M

pH = -log(0.0005 M) = 2.3

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Answer:

A + B → C + D + heat

Explanation:

A. A+B+heat⇒C+D

In an endothermic reaction, the system requires energy/heat, the enthalpy change is positive.

Answer: crystal lattice

Answer: As the substance changes from a liquid to a gas, bonds within its molecules almost dissapear and the average distance between them.

Explanation:

Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts.

Chemical weathering changes the molecular structure of rocks and soil.

Chemical Weathering is defined as the chemical reaction that takes place between the rain, flowing water, and rocks along with minerals.

It results in the decaying of minerals and the rocks for the formation of new minerals, as we as, the soluble salts due to the reaction being highly acidic.

Since the reaction is acidic, it causes 'unrecognizable facial features on a marble statue.

These reactions occur particularly when the water is slightly acidic.

Thus, chemical weathering is caused by rainwater reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts.

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Answer

Explanation:

P1=93.5 kPa  V1=480 mL  P2=?  V2=375 mL  

Answer:

14.0067 + 1.00794*4 + 35.453

Explanation:

Answer:

A standard solution is any chemical solution which has a precisely known concentration.

Sodium Chloride for example.

Explanation:

Answer:

A standard solution is solution containing precisely known concentration of an element or a substance

Considering the definition of compound, chemical formula and Avogadro's Number, there are 4.8184×10²⁴ atoms of O in 2 moles of H₃PO₄.

In a compound there are atoms of different elements joined by forces that we call chemical bonds.

The chemical formula indicates the number and type of different atoms present in the molecule.

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

In this case, in 1 mole of the compound H₃PO₄ you have:

Then, in 2 moles of H₃PO₄ you have 8 moles of O.

Now, you can apply the following rule of three: if by definition of Avogadro's number 1 mole of oxygen contains 6.023×10²³ atoms, 8 moles of oxygen contains how many oxygen atoms?

[tex]number of atoms=\frac{8 molesx6.023x10^{23}atoms }{1 mole}[/tex]

number of atoms= 4.8184×10²⁴ atoms

Finally, there are 4.8184×10²⁴ atoms of O in 2 moles of H₃PO₄.

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Answer:

A. Ea, activation energy,, hope this helps.

Answer: The high temperature raises the volume of air inside the ball according to Charles's law because this law describes how a gas will behave at constant pressure.

Answer:

D. The high temperature raises the volume of air inside the ball according to Charles's law because this law describes how a gas will behave at constant pressure.

Explanation:

I took the exam

Answer: 2.749 x 10^-14

Explanation:

Given:

The concentration of Ce(IO3)4 in the solution = 1.5 x 10-2 g/100 mL= 0.15 g/1000 mL​​​​​​​= 0.15 g/L

Molar mass of Ce(IO3)4 = 839.7267 g/mol

Therefore, the molarity of Ce(IO3)4 in the solution is given by:

[tex]$$\begin{gathered}M=\frac{0.15 \mathrm{~g} / L}{839.7267 \mathrm{~g} / \mathrm{mol}} \\M=1.7863 \times 10^{-\mathbf{4}} \mathrm{mol} / {L}=\mathbf{1 . 7 8 6 3 \times 1 0 ^ { - \mathbf { 4 } } \boldsymbol { M }}\end{gathered}$$[/tex]

The solubility equilibrium is given by:

[tex]$$\mathrm{Ce}\left(\mathrm{IO}_{3}\right)_{4(s)} \rightleftharpoons \mathrm{Ce}_{(a q)}^{3+}+3 \mathrm{IO}_{3}^{-}(a q)$$[/tex]

Therefore, the solubility product is given by:

[tex]\begin{gathered}K_{s p}=\left[C e^{3+}\right] \cdot\left[I O_{3}^{-}\right]^{3} \\\therefore K_{s p}=\left(1.7863 \times 10^{-4}\right) \times\left(3 \times 1.7863 \times 10^{-4}\right)^{3}\end{gathered}[/tex]

[tex]\therefore {K_{s p}=2.749 \times 10^{-14}[/tex]

Answer:

change of color

Explanation:

One or more of the following events can indicate that a chemical reaction has occurred: The reaction flask's interior has undergone a color shift. A change in color and the appearance of bubbles are two indications of a chemical shift. The correct option is B.

A large variety of various observable characteristics, such as color change, energy change (temperature change or light produced), gas production, precipitate formation, and property change, can be used to detect chemical reactions.

An indicator is a chemical substance that modifies color when an acid or base is present. Indicators are often mildly acidic or basic in nature and originate from plant pigments.

Thus the correct option is B.

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Answer:

mass is always constant for a body.

Explanation:

one way to calculate mass is Mass=Volume ×Density

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Answer:

How do you find the concentration of OH in a solution?

The hydroxide ion concentration can be found from the pOH by the reverse mathematical operation employed to find the pOH. [OH-] = 10-pOH or [OH-] = antilog ( - pOH) Page 2 Example: What is the hydroxide ion concentration in a solution that has a pOH of 5.70? On a calculator calculate 10-5.70, or "inverse" log (- 5.70).Explanation:

Answer:

A rip current is least likely to affect Florida.

Explanation:

Since Florida is surrounded by bodies of water it would make sense for Tsunamis to occur frequently. Florida is also known to have drought problems and sometimes also wildfires. A rip current would probably affect Florida the least as it is also the least dangerous to society.

Answer:

tsunami

Explanation:

Answer:

lithium lithium (or 2lithium) + oxygen ->

Explanation:

Your welcome

Answer:

The hotter one loses heat and the cooler one gains heat until they become equal in temperature.

Answer:

Cheap energy

Explanation:

Fossil fuels such as coal, oil, and gas are widely available and are much cheaper than other forms of energy (wind, nuclear, etc.) Fossil fuel products are also quite efficient, as the efficieny of fossil fuels is about 50% (which is actually really good), while solar panels for example are only about 15% efficient.

An ecosystem is simply a collection of communities of plants, animals, and microbes interacting together and with their physical environments.

Energy enters the ecosystem through a group of living organisms known as the producers. the producers are mainly the green plants that are capable of photosynthesizing.

Photosynthesis converts solar radiation from the sun to chemical energy in green plants. Another group of organisms in the ecosystem, the primary consumers, feed directly on the producers and as such, are able to gain some energy from them.

The secondary consumers obtain their own energy by feeding on primary consumers. Tertiary consumers feed on the secondary consumers for their own energy and the food chain goes on and on.

Only about 10% of the available energy in one trophic level goes to the next trophic level. The rest of the energy is lost as heat to the surroundings. Thus, the producers have the highest energy in the ecosystem while organisms at the top of the food chain have the lowest energy.

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Answer:

Nuclear properties

Naturally occurring beryllium, save for slight contamination by the cosmogenic radioisotopes, is isotopically pure beryllium-9, which has a nuclear spin of 3/2.Beryllium is alloyed with copper or nickel to make springs, gyroscopes, electrical contacts, spot-welding electrodes and non-sparking tools, according to the Royal Society of Chemistry. Other beryllium alloys are used in high-speed aircrafts and missiles, as well as spacecraft and communication satellites.

Explanation:

hope this helps if not let me know