A Certain gas weighs 60g. IF the relative molecular mass of the gas is 12 what is the volume of the gas?
How many milliliters of a 12% (v/v) propyl alcohol solution would you need to obtain 7.5 mL of propyl alcohol? Answer to the tenth
[tex]\tt \dfrac{7.5}{12}\times 100=62.5~ml[/tex]
Which natural hazard is least likely to affect Florida?
drought
wildfire
rip current
tsunami
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:
Which indicator most likely suggests that a chemical change is taking place?
change in size
change of color
Ochange of state
O change in shape
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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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
Answer:
answer in picture
Explanation:
The balanced chemical equation will be Ca + MgCl2 → CaCl2 + Mg.
What is balanced chemical equation?An equation that has the same quantity of atoms on both sides of the arrow would be said to represent a balanced chemical reaction.
The given equation is Ca + MgCl2 →
It is known that when Ca is reacted with magnesium chloride ( MgCl2) then it will form calcium chloride (CaCl2 ) and magnesium.
Ca + MgCl2 → CaCl2 + Mg.
It can be seen that, calcium has one atom in the reactant side and one atom in product side. On the other hand, chlorine has one atom in reactant side as well as product side.
Hence, the reaction will be balanced.
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Calculate the solubility product for the following:
Ce(IO3)4, 1.5 × 10–2 g/100.0 mL (IO3- is the anion)
Ksp = ______ x10______
Use correct significant figures
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]
Which word equation shows lithium oxide being formed from the reaction between oxygen and lithium? oxygen lithium oxide right arrow. lithium lithium oxygen right arrow. lithium oxide oxygen lithium right arrow. lithium oxide lithium oxide right arrow. lithium oxygen
Answer:
lithium lithium (or 2lithium) + oxygen ->
Explanation:
Your welcome
What is the formula mass
Answer:
mass is always constant for a body.
Explanation:
one way to calculate mass is Mass=Volume ×Density
4. Which of the following involves the largest consumption of fresh water resources?
a. Recreational purposes by humans
b. Agricultural processes
c. Drinking purposes by humans
d. Industrial processes
What happens to the distance between molecules when a substance changes from a liquid to a gas? Why?
Answer: As the substance changes from a liquid to a gas, bonds within its molecules almost dissapear and the average distance between them.
Explanation:
If the volume of an air pump used to inflate a football decreases from 480 mL to 375 mL, and the original
pressure was 93.5 kPa, what is the new air pressure in the pump if the temperature stays constant?
Answer
Explanation:
P1=93.5 kPa V1=480 mL P2=? V2=375 mL
A system is a group of parts that can be considered one unit. Storm systems, ecosystems, and our bodies are natural systems. Cars and houses are human-made systems. Choose an example of a system, and analyze the energy flow through the system. Describe in detail how energy enters the system, how energy changes form while in the system, and how energy leaves the system.
An ecosystem is simply a collection of communities of plants, animals, and microbes interacting together and with their physical environments.
Energy flow in an ecosystemEnergy 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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5
Select the correct answer.
In the Arrhenius equation, which variable represents the activation energy for the reaction?
A. Ea
B. R
C.T
D.k
Answer:
A. Ea, activation energy,, hope this helps.
What happens when two substances of different temperatures come in contact with each other?
Answer:
The hotter one loses heat and the cooler one gains heat until they become equal in temperature.
Substances that cause the oxidation of other substances are
a, reducing agents,
b. oxidizing agents,
c. catalysts.
d. cells.
==============================
[tex]\large \sf\underline{Question:}[/tex]
Substances that cause the oxidation of other substances are;==============================
[tex]\large \sf\underline{Answer:}[/tex]
[tex] \qquad \qquad \huge \bold{Option \: B}[/tex]
==============================
[tex]\large \sf\underline{Explanation:}[/tex]
Substances that cause the oxidation of other substances are oxidizing agents.==============================
2.0 moles of H3PO4 equals how many atoms of O
Considering the definition of compound, chemical formula and Avogadro's Number, there are 4.8184×10²⁴ atoms of O in 2 moles of H₃PO₄.
What is compound and chemical formulaIn 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 NumberAvogadro'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.
Atoms of OIn this case, in 1 mole of the compound H₃PO₄ you have:
3 moles of H.1 mol of P.4 moles of O.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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pleaseeeeeeeeeeee help this is due today
The final temperature of the sample of gas is 689.65 Kelvin.
What is the relation between temperature and pressure?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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What is a standard solution?
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
calculate the molecular weight of ammonium chloride
Answer:
14.0067 + 1.00794*4 + 35.453
Explanation:
What is the [OH-] of a solution which has a [H+] of 1×10−5 M1×10−5 M?
Activist groups have helped increase awareness of the dangers of drinking and driving.
A. True
B. False
19. What is Beryllium's spin ?
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
PLEASE HELP ASAPP!!!!! PLEASE I’LL TRY TO GIVE BRAINLIEST!
What is a benefit of fossil fuel consumption?
low pollution
increased greenhouse gases
renewable resource
cheap energy
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.
[?] describes the three dimensional highly repeating particles within a solid?
Answer: crystal lattice
NH3 has a concentration of exactly 2.55 M has a Kb of 9.88 x 10-8 M.
a. What is the value of Kb expression for this acid?
b. What is the pH of this solution?
From the calculations, we can see that the pH of the solution is 2.3
What is Kb?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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Which of the following indicates an endothermic reaction? I will mark as brainliest if correct.
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.
Which of the following is most likely caused by chemical weathering?
Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts.
What is chemical weathering?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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Janet observes that the shape of a dented table tennis ball is restored by heating the ball gently in warm water. Which of the following gas laws is used to understand the observation made by Janet and why?
The high temperature lowers volume according to Boyle's law because this law describes how a gas will behave when the number of moles remains constant.
The high temperature raises volume according to Boyle's law because this law describes how a gas will behave when the number of moles remains constant.
The high temperature lowers the volume of air inside the ball according to Charles's law because this law describes how a gas will behave at constant pressure.
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: 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
If the pH of a solution is 8.45, what is the concentration of the OH-?
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:
7. The picture below shows a girl with a widow's peak. Widow's peak She has a widow's peak because of her -
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
