Answer:
7
Explanation: i just guessed because i need some points
why does oxygen and carbon dioxide travel within the seed and the egg
A 31.0 mL sample of 0.624M perchloric acid is titrated with a 0.258M sodium hydroxide solution.
What is the (H+) molarity after the addition of 15.0 mL of KOH?
Answer:
0.0922 M
Explanation:
The problem first states that the titration is made using NaOH, and later asks about the addition of KOH. I'm going to assume NaOH was used throughout the whole problem. The result does not change if it was KOH instead.
The reaction that takes place is:
HClO₄ + NaOH → NaClO₄ + H₂OFirst we calculate how many HClO₄ moles are there in the sample, using the given molarity and volume:
0.624 M * 13.0 mL = 8.11 mmol HClO₄Then we calculate how many NaOH moles were added:
0.258 M * 15.0 mL = 3.87 mmol NaOHNow we calculate how many HClO₄ remained after the reaction:
8.11 - 3.87 = 4.24 mmol HClO₄As HClO₄ is a strong acid, 4.24 mmol HClO₄ = 4.24 mmol H⁺
Finally we calculate the molarity of H⁺, using the calculated number of moles and final volume:
Final volume = 31.0 mL + 15.0 mL = 46.0 mL4.24 mmol / 46.0 mL = 0.0922 MA gas that exerts a pressure of
15.6 psi in a container with a volume of
L will exert a pressure of
25.43 psi when transferred to a
container with a volume of 1.895 L.
Answer:
3.089 L
Explanation:
From the given information, provided that the no of moles and the temperature remains constant;
[tex]P_1[/tex] = 15.6 psi
[tex]V_1[/tex] = ???
[tex]P_2[/tex] = 25.43 psi
[tex]V_2[/tex] = 1.895 L
Using Boyle's law:
[tex]P_1V_1 =P_2V_2 \\ \\ V_1 = \dfrac{P_2V_2}{P_1} \\ \\ V_1 = \dfrac{25.43 \times 1.895}{15.6} \\ \\ \mathbf{ V_1 = 3.089 \ L}[/tex]
h20 (s) -> h20 (g)
endothermic or exothermic
Answer:
Endothermic.
Explanation:
Hello there!
In this case, it is necessary to keep in mind that exothermic processes are characterized by the release of energy and the endothermic processes by the absorption of heat. In such a way, every process from solid to liquid or gas is endothermic as they require energy to separate the molecules and therefore turn out in the phase change. On the other hand, every process from gas to liquid or solid is exothermic as heat is released to rejoin the molecules and produce the phase change.
Therefore, since solid water molecules tend to be well-arranged, it is necessary to add heat to the system to produce the phase change until gas; in such a way, this process is endothermic as energy must be absorbed by the ice.
Best regards!
Why does the cake and pan feel different to your hand when you take them out of the oven? Explain
Answer:
bcs the oven heated it up?
Explanation:
If the reaction is begun with an initial PH3 concentration of 0.95 M, what will be the concentration of PH3 after 30.50 s
Answer:
[tex][PH_3]=0.30M[/tex] but see detailed explanation, please.
Explanation:
Hello there!
In this case, unfortunately, we are not given the rate constant but we can set up a reaction according to the information available on the internet:
[tex]4PH_3\rightarrow P_4+6H_2[/tex]
Whose rate constant is 0.0375/s. In such a way, it is possible infer that this is first-order reaction whose integrated rate law is:
[tex][PH_3]=[PH_3]_0exp(-kt)[/tex]
Thus, given the initial concentration, rate constant and elapsed time, the final concentration of PH3 would be:
[tex][PH_3]=(0.95M)exp(-30.50s*0.0375/s)\\\\[/tex]
[tex][PH_3]=0.30M[/tex]
However, it is important to keep in mind this result may vary according to your actual question.
Regards!
What occurs during a decomposition reaction?
Answer:
Hello
The chemical bonds between the atoms of the decomposing compound are broken, and then rearranged between the atoms in new ways to make the products.
Explanation:
The chemical bonds between the atoms of the decomposing compound break, and new substances are formed as new chemical bonds form between the atoms of the elements of the decomposed compound.
Have a nice day!Without using the value of So, predict the sign for
a) 2K(s) + F2(g) → 2KF(g)
b) NaClO3(s) → Na+(aq) + ClO3-(aq)
c) 2NO(g) + O2(g) → 2NO2(g)
d) H2S(g) + O2(g) → S8(s) + H2O(g)
Answer:
a) 2f
B)CIO3+na
c)2NO2(g)
d)HSO3(h)
Explanation:
The sign of entropy depends on the number of gaseous substance in the system. In the first reaction, the number of gaseous particles increase in the product hence, randomness increases and thereby entropy is positive.
What is entropy ?Entropy is a thermodynamic quantity which measures the randomness of the system. As the disorder in the system increases, the entropy increases and the entropy change is said to be positive in sign.
In the first reaction, in the product side, 2 moles of gaseous substance is formed, which increases the randomness, hence, entropy change is positive.
In the second reaction, the more ordered solid state is getting into less ordered aqueous state. Hence, S is positive.
For the third reaction, the number of moles of gas decreases from 3 to 2. Hence S is negative. For the last reaction, there is no change in number of moles or state of substance and no change in S.
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Click on an olive tree and read about it. Based on what you read, do you think the climate of Barcelona is very wet or rather dry? Explain.
Answer:
In the Autumn, Spring, and Winter, It is wet. In the Summer it is dry.
Explanation:
explain hydrophobic and hydrophylic
Answer:
hydrophobic: tending to repel or fail to mix with water.
hydrophylic: having a tendency to mix with, dissolve in, or be wetted by water.
Hope it helps!!!
What scientifically goes on with a plasma ball?
Answer:
the electrode at the center of a plasma ball emits a high-frequency,high-voltage alternating electric current. This current flows through the plasma filaments to create colorful tendrils of light.
Explanation:
what colors depend upon the gases used inside the plasma ball? common gases include neon, argon, xenon, and krypton.
Encountering problems during separation/purification is a very common issue in organic synthesis, but these steps are crucial to isolate your desired product.
a. True
b. False
Which has greater heat capacity—iron, tin, or bismuth? Why do you say this?
Answer:
Bismuth, because when three cubes of the same mass were heated and dropped into the same temperature water, the water the bismuth cube was dropped in heated up much less than the water with iron or tin.
REWRITE THIS IN YOUR OWN WORDS PLEASE, THANK YOU.
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The greatest heat capacity is possessed by iron.
The heat capacity of materials increases as the number of particles in the material or density of the material increases.
This means that the denser a material is, the higher its heat capacity because it has more particles that absorbs heat.
The heat capacity is the quantity of heat required to raise the temperature of 1 gram of a material by 1°C.
The heat capacities of iron, tin and bismuth are: 0.45 J/g °C, 0.213 J/g °C and 0.123 J/g °C.
This follows from the decreasing densities of the metals in the order; iron > tin > bismuth.
Hence iron has the greatest heat capacity among the three elements.
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Determine the moles of carbon dioxide in 2.9 X 10¹² molecules.Round to 2 significant figures.
Which statement describes a reason scientists predict that carbon dioxide emissions will increase over the next few decades? Choose the correct answer.
The use of geothermal energy is increasing.
Fossil fuels are being replaced with renewable energy sources.
Increased carbon dioxide in the atmosphere can lead to a loss of biodiversity.
Many countries are undergoing an increase in technology and standard of living.
Answer:
Many countries are undergoing an increase in technology and standard of living.
Explanation:
The statement describes a reason scientists predict that carbon dioxide emissions will increase over the next few decades is many countries are undergoing an increase in technology and standard of living. Therefore, option D is correct.
What increases carbon dioxide emissions?The main contributor to the rising carbon dioxide concentrations in the atmosphere is human activity, specifically the burning of fossil fuels like coal, oil, and gas, as well as deforestation.
Coal and oil emissions are expected to be higher than they were in 2021, with oil accounting for the majority of the increase in overall emissions.
The delayed recovery of international aviation following COVID-19 pandemic limitations accounts for a major portion of the increase in emissions from burning oil.
Greenhouse gases have far-ranging environmental and health effects. They make climate change by trapping heat, and they also impart to respiratory disease from smog and air pollution.
Thus, option D is correct.
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with a well labeled diagram explain the stages of meiosis and mitosis
Answer:
hope that helps
Which example is a mixture? alcohol water mercury orange soda
Answer:
water is an example of mixture
As an FDA physiologist, you need 0.625 L of phosphoric acid acid / dihydrogen phosphate (H3PO4 (aq) / H2PO4 - (aq) ) buffer with a pH of 2.75. How do you prepare this solution from stock solutions of 1.0 M H3PO4 (formic acid) and 1.5 M NaOH
Answer:
0.4058L of 1.0M H3PO4
0.2192L of 1.5M NaOH
Explanation:
The pKa of the H3PO4 / H2PO4- buffer is 2.12
To solve this question we must use H-H equation for this system:
pH = pKa + log [H2PO4-] / [H3PO4]
2.75 = 2.12 + log [H2PO4-] / [H3PO4]
0.63 = log [H2PO4-] / [H3PO4]
4.2658 = [H2PO4-] / [H3PO4] (1)
Where [] could be taken as the moles of each reactant
As you have H3PO4 solution, the reaction with NaOH is:
H3PO4 + NaOH → H2PO4- + Na+ + H2O
As you can see, both H3PO4 and H2PO4- comes from the same 1.0M H3PO4 solution
The moles of H3PO4 are:
[H3PO4] = Moles H3PO4 - Moles NaOH
And for H2PO4-:
[H2PO4-] = Moles NaOH added
Replacing in (1):
4.2658 = [Moles NaOH] / [Moles H3PO4 - Moles NaOH]
4.2658 Moles H3PO4 - 4.2658 moles NaOH = Moles NaOH
4.2658 Moles H3PO4 = 5.2658 moles NaOH (1)
In volume:
0.625L = Moles H3PO4 / 1.0M + Moles NaOH / 1.5M
0.625 = Mol H3PO4 + 0.6667 Moles NaOH (2)
Replacing (2) in (1):
4.2658 Moles H3PO4 = 5.2658 (0.625 - Mol H3PO4 / 0.6667)
4.2658 Moles H3PO4 = 5.2658 (0.625 - Mol H3PO4) / 0.6667
4.2658 Moles H3PO4 = 5.2658*(0.9375 - 1.5 mol H3PO4)
4.2658 Moles H3PO4 = 4.9367 -7.8983 mol H3PO4
12.1641 mol H3PO4 = 4.9367
Mol H3PO4 = 0.4058moles * (1L / 1.0moles) =
0.4058L of 1.0M H3PO4
And:
0.625L - 0.4058L =
0.2192L of 1.5M NaOH
The state of matter in which a material has definite shape and definite
volume is the
Answer:
It's a solid.
Explanation:
Solids never change their shape as opposed to gases and liquids. This is because their molecules are tightly packed together. Since all solids have a definite shape, it's volume will also be definite.
A company claims that its weight-loss product is the safest. Why might this
be a biased claim?
A. The company is trying to get you to buy its product.
B. The company has lots of scientific information about the product
C. The company is very successful.
D. The company has studied the product more than anyone.
Which cross section below best shows the locations of high air pressure and low air pressure near a beach on a hot, sunny, summer afternoon?
Locations of high air pressure is the beach whereas the location of low air pressure is in the sea on a hot, sunny, summer afternoon.
Where is low and high air pressure exists?Areas where the air is warmed have lower pressure because the warm air rises in the air. These areas are known as low pressure systems. Places where the air pressure is high, are called high pressure systems. These are places where air is cold.
So we can conclude that Locations of high air pressure is the beach whereas the location of low air pressure is in the sea on a hot, sunny, summer afternoon.
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The relation between molarity and normality is expresses as: a) M = N x g.e.w/g.m.w
b) M = N x g.m.w/ g.e.w
c) M = N x no. of equiv./mole
d) M = N x no. of g.m.w/mole
Answer: [tex]Molarity=Normality\times \frac{gew}{gmw}[/tex]
Explanation:
Molarity is defined as the number of moles dissolved per liter of the solution.
[tex]Molarity=\frac{\text {moles of solute}}{\text {Volume in L}}[/tex]
[tex]{\text {moles of solute}=\frac{\text {given mass}}{\text {Molar mass}}[/tex]
Normality is defined as the number of gram equivalents dissolved per liter of the solution.
[tex]Normality=\frac{\text {gram equivalents of solute}}{\text {Volume in L}}[/tex]
[tex]{\text {gram equivalents of solute}}=\frac{\text {given mass}}{\text {Equivalent mass}}[/tex]
Thus [tex]Molarity=Normality\times \frac{\text {Equivalent mass}}{\text {Molar mass}}[/tex]
An acid of known strength, HA, is used in a titration to determine the concentration of a solution of NaOH. What ions are present in the flask at the equivalence point?
Answer:
Na+ And A-
Explanation:
Answer: Na + and A-
Explanation:
1.2 What type of bonding occurs when hydrogen form a diatomic molecule?
Answer:
I think it is covalent bonding...
Explanation:
The bonding is covalent in homonuclear diatomic molecules. Each atom in the molecule has the same electronegativity, which means electrons are shared equally between the two. The electronegativity of the atoms in heteronuclear diatomic molecules varies, and these molecules have polar covalent bonds. A dipole is formed when a molecule interacts with another molecule. (i think it's covalent bonding but i might be wrong)
hope this helps...
The isomerization reaction, ch3nc → ch3cn, is first order and the rate constant is equal to 0.46 s-1 at 600 k. what is the concentration of ch3nc after 7.0 seconds if the initial concentration is 0.30 m?
Answer:
y=meme3squared
Explanation:
YEEEEEEEEEEEEEEEE
11. Which of the following elements CANNOT violate the octet rule?
a.
Nitrogen
b. Phosphorus
c. Sulfur
d. lodine
Answer:
I think it's Nitrogen is right answer
What volume in milliliters of 0.100 M HCIO3 is required to neutralize
40.0 mL of 0.165 M KOH?
Answer:
66.0 mL HClO3
Explanation:
M1V1 = M2V2
M1 = 0.100 M HClO3
V1 = ?
M2 = 0.165 M KOH
V2 = 40.0 mL KOH
Solve for V1 --> V1 = M2V2/M1
V1 = (0.165 M)(40.0 mL) / (0.100 M) = 66.0 mL HClO3
What is the volume of a 5.00 molar solution containing 20 moles of 0.40 10.0L 0.010L
Answer:
Volume of solution = 4 liter
Explanation:
Given:
Molarity = 5 M
Number of moles = 20 moles
Find:
Volume of solution
Computation:
Moles of solute mixed per litre of solution is known as molarity. A 1 M sample is the one in which 1 molecule of solvent is soluble in one liter of solution volume.
M = Mol / L
5 = 20 / L
Volume of solution = 4 liter
Aqueous hydrochloric acid will react with solid sodium hydroxide to produce aqueous sodium chloride and liquid water . Suppose 1.5 g of hydrochloric acid is mixed with 2.67 g of sodium hydroxide. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your answer to significant digits.
Answer: The maximum amount of water that can be produced is 0.74 g
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] .....(1)
Putting values in equation 1, we get:
[tex]\text{Moles of hydrochloric acid:}=\frac{1.5g}{36.5g/mol}=0.041mol[/tex]
[tex]\text{Moles of sodium hydroxide}=\frac{2.67g}{40g/mol}=0.067mol[/tex]
The chemical equation for the reaction is
[tex]HCl+NaOH\rightarrow NaCl+H_2O[/tex]
By Stoichiometry of the reaction:
1 mole of HCl reacts with 1 mole of NaOH
So, 0.041 moles of HCl will react with = [tex]\frac{1}{1}\times 0.041=0.041mol[/tex] of NaOH
As, given amount of NaOH is more than the required amount. So, it is considered as an excess reagent. Thus, HCl is considered as a limiting reagent because it limits the formation of product.
By Stoichiometry of the reaction:
1 mole of HCl produces = 1 mole of water
So, 0.041 moles of HCl will produce = [tex]\frac{1}{1}\times 0.041=0.041moles[/tex] of water
Mass of water=[tex]moles\times {\text{Molar Mass}}=0.041mol\times 18g/mol=0.74g[/tex]
Thus the maximum amount of water that can be produced is 0.74 g
different between intermolecular and intra molecular dehydration