Answer:
The amount of N2O4 increases.
Explanation:
Based on LeCh's principle, a change in the state of an equilibrium produce an effect in the system that try to restore the initial equilibrium.
For example, in the problem, the change is the increasing in the pressure. The system will try to decrease the pressure of the system. To decrease the pressure the system needs to decrease the moles of gas. As 2 moles of NO2 produce 1 mole of N2O4, the system will:
Shift to the right increasing the amount of N2O4 and decreasing the amount of NO2. Right option is:
The amount of N2O4 increases.A solution is prepared by mixing 0.10 of 0.12 M sodium chloride with 0.23 L of a 0.18 M magnesium chloride solution. What is the pCl- of the resulting solution?
Answer:
pCl⁻ = 0.54
Explanation:
First we calculate how many Cl⁻ moles are coming from each substance, using the given volumes and concentrations:
0.12 M NaCl * 0.10 L = 0.012 mol NaCl = 0.012 mol Cl⁻0.18 M MgCl₂ * 0.23 L = 0.0414 mol MgCl₂ = (0.0414 * 2) 0.0828 mol Cl⁻The final volume of the mixture is = 0.10 L + 0.23 L = 0.33 L
Now we calculate [Cl⁻], using the total number of Cl⁻ moles and the final volume:
[Cl⁻] = (0.012 mol + 0.0828 mol) / 0.33 L = 0.29 MFinally we calculate the pCl⁻ of the resulting solution:
pCl⁻ = -log[Cl⁻]pCl⁻ = 0.54
3. 78 mL of 2.5 M phosphoric acid is neutralized with 500 mL of potassium hydroxide. What is the
concentration of the base?
calculate the percentage of oxygen in Al(NO3)3
Answer;
4.29%
Explanation:
molecular weight of Al(NO3)3 is
27+(14+16*3)3=213 amu
total mass of oxygen is 3*3=9 amu
percentage is 9/213*100=4.25%
Physical weathering can result from the action of all of the following EXCEPT __________.
ice
burrowing by animals
carbon dioxide
plant roots
What property of a substance does its specific heat capacity describe?
Answer: How much heat it takes to raise the temperature
Explanation:
a pex
How many grams of 02 are present in 7.49 L of oxygen gas?
Answer:
10.70grams
Explanation:
Density of a substance = mass/volume
At STP of a gas (standard temperature and pressure), the density of oxygen gas is 1.429 g/L
Hence, according to this question, in 7.49 L of oxygen gas, there would be:
Using D = m/V
1.429 = m/7.49
m = 1.429g/L × 7.49L
m = 10.70g
HELP ASAP!!! if 600.0 grams HF reacts with excess SiO2, how many grams of H2O are produced? Use the following molar masses: HF= 20.01g
H2O=18.02g
Show work.
Answer: The mass of water produced is 180.02 g
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
Given mass of HF = 600.0 g
Molar mass of HF = 20.01 g/mol
Plugging values in equation 1:
[tex]\text{Moles of HF}=\frac{600.0g}{20.01g/mol}=29.98 mol[/tex]
The given chemical equation follows:
[tex]SiO_2+6HF\rightarrow H_2SiF_6+2H_2O[/tex]
By the stoichiometry of the reaction:
If 6 moles of HF produces 2 moles of water
So, 29.98 moles of HF will produce = [tex]\frac{2}{6}\times 29.98=9.99mol[/tex] of water
Molar mass of water = 18.02 g/mol
Plugging values in equation 1:
[tex]\text{Mass of water}=(9.99mol\times 18.02g/mol)=180.02g[/tex]
Hence, the mass of water produced is 180.02 g
A student repeats a reaction several times to test the effects of various
changes on the reaction rate. The data table shows the results. How does
increasing the concentration of the reactants change the reaction rate?
5
Conditions
Reaction Time (5)
10 seconds
Original
Higher concentration
Higher temperature
5 seconds
5 seconds
Metal added
5 seconds
A. Increasing the concentration has no effect on the reaction rate.
B. Increasing the concentration decreases the reaction rate.
C. Increasing the concentration increases the reaction rate.
D. More information is needed to determine what happens to the
reaction rate.
Answer:
The correct answer is - C. Increasing the concentration increases the reaction rate.
Explanation:
In the given question the data with change in different factors affect the rate of reaction differently as it alters the time it takes to complete reaction:
Conditions Reaction Time
Original 10 seconds
Higher concentration 5 seconds
Higher temperature 5 seconds
Metal added 5 seconds
As it is given above, time is decreased in each condition including in the case of increasing the concentration of the reactants which means the rate of reaction increases as well.
how many milliliters of 0.105 M HCL are needed to titrate 22.5 ml of 0.118 M NaOH to the equivalence point
How many atoms are present in 44.89 moles of Be?
Answer:
I hope that helps. I did not round the answer at the end. Maybe you want the final answer in a specific decimal place.
g 10.00 mL of phosphoric acid (H3PO4) are titrated with 0.1000 M sodium hydroxide. 15.00 mL of the sodium hydroxide solution are used in this experiment. Determine the molarity of phosphoric acid.
Answer: The molarity of phosphoric acid is 0.05 M
Explanation:
A neutralization reaction is defined as the reaction in which an acid reacts with a base to form a salt and water molecule.
At equivalence, moles of acid becomes equal to the moles of base. The equation for the neutralization follows:
[tex]n_1M_1V_1=n_2M_2V_2[/tex] ........(1)
where,
[tex]n_1, M_1\text{ and }V_1[/tex] are the n-factor, molarity and volume of acid that is [tex]H_3PO_4[/tex]
[tex]n_2, M_2\text{ and }V_2[/tex] are the n-factor, molarity and volume of the base that is NaOH
Given values:
[tex]n_1=3\\M_1=?M\\V_1=10.00mL\\n_2=1\\M_2=0.1000M\\V_2=15.00mL[/tex]
Plugging values in equation 1:
[tex]3\times M_1\times 10.00=1\times 0.1000\times 15.00\\\\M_1=\frac{1\times 0.1000\times 15.00}{3\times 10.00}\\\\M_1=0.05M[/tex]
Hence, the molarity of phosphoric acid is 0.05 M
Which of the following is NOT a property of alkanes?
a)
The boiling point increases as the number of carbons in the compound
increases
b) They are unreactive under standard conditions
C) They have weak intermolecular attractions
d) They are soluble in water
Answer:
D
Explanation:
because alkanes don't dissolve in water. They are insoluble.
A solution prepared by dissolving 171 mg of a sugar (a molecular compound and a nonelectrolyte) in 1.00 g of water froze at -0.930°C. What is the molar mass of this sugar? The value of Kf is 1.86°C/m.
Answer:
The appropriate answer is "342 g/mol".
Explanation:
Given:
Freezing point,
= 0.93°C
Kf,
= 1.86°C/m
Mass,
= 171
As we know,
⇒ [tex]Freezing \ point = Kf\times molality[/tex]
[tex]0.93=1.86\times molality[/tex]
[tex]Molality=\frac{0.93}{1.86}[/tex]
[tex]=0.5 \ m[/tex]
Now,
⇒ [tex]Molality=\frac{moles \ of \ sugar}{mass \ of \ water}[/tex]
[tex]0.5=\frac{moles \ of \ sugar}{0.01}[/tex]
[tex]moles \ of \ sugar=0.0005 \ mol[/tex]
hence,
The molar mass of the sugar will be:
= [tex]\frac{mass}{moles}[/tex]
= [tex]\frac{171\times 10^{-3}}{0.0005}[/tex]
= [tex]342 \ g/mol[/tex]
ASAP
A chemical equilibrium between gaseous reactants and products is shown.
N2(g) + 3H2(g) ⇌ 2NH3(g)
How will the reaction be affected if the pressure on the system is increased?
It will shift toward the reactant side as there is lower pressure on the reactant side.
It will shift toward the product side as there is higher pressure on the product side.
It will shift toward the reactant side as there are a greater number of moles of gas on the reactant side.
It will shift toward the product side as there are a fewer number of moles of gas on the product side
The chemical equilibrium is the state at which the rate of reaction is constant. The increase in pressure shifts the reaction towards the product side, as fewer moles of the product are there.
What are the factors affecting the chemical equilibrium?The chemical equilibrium is shifters with the change in the concentration, temperature, pressure, and volume of the reaction.
The increase in the pressure results in more contact between the reactant molecules, as they are more in number and moles in the reaction.
The increased collision of the reactant molecules tried to reach the equilibrium condition, and the increased formation of the product is observed.
Thus, the increase in the pressure shifts the chemical equilibrium towards the product, as there were few moles of the product in the reaction.
Learn more about chemical equilibrium, here:
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Answer:
its C
Explanation:
just took the test
What is true of a Brønsted-Lowry acid?
A. A Bronsted-Lowry acid donates OHĽions.
B. A Bronsted-Lowry acid donates H+ ions.
C. A Bronsted-Lowry acid donates electrons.
D. A Bronsted-Lowry acid donates a metal
Question 3 (4 points)
The concentration of hydroxide ions in a solution that has a poH of 6.0 is
a
10-6 M.
Ob
106 M.
Ос
101 M.
Od
10-8 M.
Answer:
a. 1.0 × 10⁻⁶ M (≈ 10⁻⁶ M)
Explanation:
Step 1: Given data
pOH of the solution: 6.0
Step 2: Calculate the concentration of hydroxide ions ([OH⁻]) in the solution
We will use the definition of pOH.
pOH = -log [OH⁻]
[OH⁻] = antilog -pOH
[OH⁻] = antilog -6.0
[OH⁻] = 1.0 × 10⁻⁶ M
Since [OH⁻] > 10⁻⁷ M, we can conclude that the solution is basic.
The pressure exerted by a gas container depends on
Once formed, how many valence electrons does an anion hold?
Answer:
Anions. Some atoms have nearly eight electrons in their valence shell and can gain additional valence electrons until they have an octet. When these atoms gain electrons, they acquire a negative charge because they now possess more electrons than protons. Negatively charged ions are called anions.
. A 60.0 g piece of Zn at 20.0 o C is dropped into 200.0 g of water at 100.0 o C. Determine the final temperature reached by the Zn and water, knowing that the specific heat capacity of Zn and water are 0.389 J/(g.o C) and 4.184 J/(g.o C), respectively.
Answer:
97.8 C
Explanation:
Recall the equation for specific heat:
q = mcΔT
There are several things to know in order to answer this question:
1. Whatever heat energy one object gains is the same as the heat energy the other has lost (conservation of energy).
2. Since one substance loses heat and the other gains heat, you need to multiply one side by -1 to account for the opposite direction of heat transfer.
3. The final temperature of both substance will be the same (zeroth law of thermodynamics)
Below, the left side of the equation represents water and the right side represents zinc.
-1 x 200 x 4.184 x (T - 100) = 60 x 0.389 x (T - 20)
Solve this equation and you get T = 97.8.
A fungicide was used to kill the mushrooms in a
lawn. Some mushrooms were not affected by the
fungicide. The resistant mushrooms reproduced.
The resistance of some of the mushrooms to the
fungicide was
Answer: a
Explanation:
Classify each of the following elements as a metal, nonmetal, or metalloid.
Na, Ge, Si, Br, Ag
Metal
Nonmetal
Metalloid
Multiple Choice
Which statement is not part of Dalton's atomic theory?
All atoms of a given element have the same mass and other properties.
Certain groups of elements have similar properties.
Each element is composed of indestructible particles called atoms.
Atoms combine in simple whole-number ratios to form compounds.
Which of the following statements is true about the properties of protons, neutrons, and electrons?
One positive charge cancels (neutralizes) another positive charge.
One negative charge cancels (neutralizes) another negative charge.
Positive and negative charges attract.
Protons have much less mass than neutrons and electrons.
ig i i i i i i i i i ii i i i i i ii i i i i i
1. Na is metal
Ge is Metalloid
Si is Metalloid
Br is Nonmetal
Ag is Metal
2. Each element is composed of indestructible particles called atoms.
3. Positive and negative charges attract.
What is Chemistry?Chemistry is the scientific study of the properties and behavior of matter. It is a natural science that covers the elements that makeup matter to the compounds composed of atoms, molecules, and ions: their composition, structure, properties, behavior, and the changes they undergo during a reaction with other substances.
In the scope of its subject, chemistry occupies an intermediate position between physics and biology. It is sometimes called the central science because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level. For example, chemistry explains aspects of plant growth (botany), the formation of igneous rocks (geology), how atmospheric ozone is formed and how environmental pollutants are degraded (ecology), the properties of the soil on the moon (cosmochemistry), how medications work (pharmacology), and how to collect DNA evidence at a crime scene (forensics).
Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds. There are two types of chemical bonds: 1. primary chemical bonds—e.g., covalent bonds, in which atoms share one or more electron(s); ionic bonds, in which an atom donates one or more electrons to another atom to produce ions (cations and anions); metallic bonds—and 2. secondary chemical bonds—e.g., hydrogen bonds; Van der Waals force bonds; ion-ion interaction; ion-dipole interaction.
Learn more about Chemistry
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Carbon 14 and carbon 12 are both isotopes of the element carbon check all answers that are true about them
Answer:
CARBON 14 INCLUDES:
-six protons
-eight neutrons in the nucleus
CARBON 12 INCLUDES:
-six protons
-Six neutrons
Using dimensional analysis convert 238.0 cm3 to L
Answer:
= 0.238 L
Explanation:
From the given information:
To convert cm³ to L(liter), we utilize the advent of a unit fraction that comprises a liter in the upper part of the fraction(numerator) and a cubic centimeter in the lower part of the fraction(denominator)
Recall that:
1000 cm³ = 1 liter
∴
238.0 cm³ = [tex]\dfrac{238.0 \ cm^3}{1} \times \dfrac{1 \ L}{1000 \ cm^3}[/tex]
= 0.238 L
One atom of chromium (Cr) has a mass of 52.00 amu. How many chromium atoms does it take to equal a mass of 52.00 g?
1 chromium atom
Explanation:
number of (Cr) atom =
[tex] \frac{mass \: of \: cr}{molar \: mass \: (amu)} [/tex]
n = m/M
n = 52/52
n= 1g
Which is a group of tissues that work together to carry out a common function?
cell
organ
organelle
organ system
Answer:
Organ as a group of tissues working together is an organ.
Draw a structural formula for the organic anion (i.e., do not include NH4 ) formed when propanal is reacted with Tollens reagent. Don't forget the charge on the ion.
Answer:
Draw a structural formula for the organic anion (i.e., do not include NH4 ) formed when propanal is reacted with Tollens reagent. Don't forget the charge on the ion.
Explanation:
Aldehydes on reaction with Tollen's reagent(ammonical silver nitrate solution) form carboxylic acids.
The anion formed is a carboxylate ion.
The entire chemical reaction is shown below:
Which diagram(s) represents the bonding pattern of
metals?
O A and B
O C and D
O A
ос
Answer:
C and D- Ionic bonding
B- Metallic bond
Explanation:
They show ionic bonding through which metals bond.
B shows metallic bonding
HURRRYYY !!!!!
Which of these statements best describe how Kennedy Space Center benefits Florida? It helps to
decrease immigration in Florida.
increase unemployment in Florida.
decrease the income from sale of goods in Florida.
increase Florida's average income per person.
Answer:
The correct answer is - increase Florida's average income per person.
Explanation:
Kennedy Space Center established by NASA helped the boosting economy of Florida. Spaceport operations in Kennedy Space Center benefit Florida by a total economic impact of nearly $4 billion on Florida's economy.
This space center helped in the 7,639 jobs in 2018 and 2019 and 37 new space operation companies. These jobs increased Florida's average income per person above $91,000.
(BRAINLIEST AWARD!! LAST QUESTION!!) Jean-Baptiste Lamarck's theory of evolution stated that an organism could pass on to its offspring all characteristics it had acquired in its lifetime. Which of these statements best explains why this theory is considered invalid at present? (1 point)
Modern scientists accept only new scientific theories.
Most of the scientists worldwide do not accept this theory.
All old theories change into new theories over a period of time.
Newspapers and science magazines do not publish this theory any more.
Answer:
Most of the scientists worldwide do not accept this theory.
Explanation:
Lamarck's theory states that acquired traits can be passed on from parents to offspring. This theory can not be sufficiently substantiated by indisputable scientific evidences hence it is not accepted by majority of scientists worldwide.
Since science is empirical and the theory is mostly based on vague speculations rather than concrete evidence, it was long rejected by many biologists.
This theory suggests that all life forms will gradually evolve from simple to complex organisms while the simple organisms gradually disappear. This is not the case.
How many moles are in 153.00 grams of KCL3?
Explanation:
you have to use the formula
number of moles=mass/molar mass
=153/145.5
=1.05g/mol
I hope this helps