Answer:
6m/s brainliest?
Explanation:
Answer:
6 m/s
Explanation:
A student pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. She then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. The student performs the experiment one more time but this time she stirs the mixture rapidly.
Answer:
It will go faster each time because she is stirring therefore the water can get to the salt faster than it just sitting at the top
Explanation:
You need to make 7.2 L of 0.8 M Ca(C2O4) What molarity would the Ca(C2O4) need to be if you were to use only 3.5 L of it ?
Show work
Answer:
i think its 7.4
Explanation:j
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The enthalpy of formation of water is -285.8 kJ/mol. What can be inferred from this statement? O The enthalpy of the products is equal to the enthalpy of the reactants. O Heat is absorbed during the process. O Heat is released during the process. The enthalpy of the products is more than the enthalpy of the reactants.
Answer:
the answer is c
Explanation:
i did the test
The enthalpy of the formation of water is -285.8 kJ/mol. The information that can be made by the statement is heat is released during the process. The correct option is C.
What is enthalpy?Enthalpy is the volume times the pressure times the internal energy of the system. It is an entity of thermodynamics. It is the measurement of the energy in a thermodynamic system. The enthalpy totals the internal energy plus pressure and volume.
The statement that is given here is given that enthalpy is -285.8 kJ/mol. The value is negative, so the energy is released here. When energy is gained the energy will be positive and when the energy is released it is negative.
Thus, the correct option is C, heat is released during the process regarding the given statement of enthalpy.
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How many moles of lithium hydroxide are required to react with 19.2 mol CO2, the average amount exhaled by a person each day?
Answer:
38.4 mol LiOH
Explanation:
Step 1: Write the balanced neutralization equation
2 LiOH + CO₂ ⇒ Li₂CO₃ + H₂O
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of LiOH to CO₂ is 2:1.
Step 3: Calculate how many moles of lithium hydroxide are required to react with 19.2 mol CO₂
19.2 mol CO₂ × 2 mol LiOH / 1 mol CO₂ = 38.4 mol LiOH
& Write five examples of liquid to liquid mixture.
Answer:
huikl
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Pick the second most abundant component of dry air.
A. Molecular nitrogen
B. Molecular oxygen
C.argon
D. Carbon dioxide
E. Water
F. Ozone
Answer:
ozone
Explanation:
the ozone layer is the thickest air on the earth's atmosphere protecting us from ultra violent rays from the sun
A radioactive sample contains two different types of radioactive nuclei: A, with half-life 5.0 days, and B, with half-life 30.0 days. Initially, the decay rate of the A-type nucleus is 64 times that of the B-type nucleus. When will their decay rates be equal
Answer:
t = 39.42 days
Explanation:
To do this, we need to use the general expression for decay rate:
R = R₀ exp(-λt) (1)
According to the problem, decay rate of A initially is 64 times rate of B, so we can say the following:
A₀ = 64B₀ (2)
The value of λ can be determined using:
λ = ln2 / t(1/2) (3)
Let's calculate first the value of λ for each nuclei:
For A: λ₁ = ln2 / 5 = 0.1286 day⁻¹
For B: λ₂ = ln2 / 30 = 0.0231 day⁻¹
Now, let's write an expression using (1) for each nuclei.
A = A₀ exp(-0.1286t)
A = 64B₀ exp(-0.1286t) (3)
B = B₀ exp(-0.0231t) (4)
We want to know the time when A = B , therefore, we can actually equals (3) and (4) and solve for t:
64B₀ exp(-0.1286t) = B₀ exp(-0.0231t)
64 exp(-0.1286t) = exp(-0.0231t)
ln(64 * exp(-0.1286t)) = ln(exp(-0.0231t))
ln64 + ln(exp(-0.1286t))= -0.0231t
4.1589 - 0.1286t = -0.0231t
4.1589 = (0.1286 - 0.0231)t
t = 4.1589 / 0.1055
t = 39.42 daysSo, in 39 days, the decay rates of A and B will be the same.
Hope this helps
Diazonium salts are explosively reactive intermediates for synthetic chemical reactions that must be handled with great care. These salts can decompose generating lots of heat and explosive generation of nitrogen gas. What can you predict about the thermodynamics of these reactions
Answer:
Exothermic Reactions are taking place in this question
Explanation:
The chemical reaction mentioned in this question is Exothermic reaction as it releases heat and is explosive in nature.
In fact exothermic reactions can release both heat and light. In such reactions the total energy of the products is less than the total energy of the reactants.
.......state Hess law
What quality is attributed to water due to “capillary action”?
A. change of liquid water into gaseous phase
B. the ability of water molecules to adhere to the surfaces of objects
C. high volatility
D. vapor pressure
Answer:
I think it's B. The ability of water molecules to adhere to the surfaces of objects
A sample of a hydrocarbon is found to contain 7.48g carbon and 2.52g hydrogen. What is the empirical
formula for this compound?
Answer:
CH₄
Explanation:
To determine the empirical formula of the hydrocarbon, we need to follow a series of steps.
Step 1: Determine the mass of the compound
The mass of the compound is equal to the sum of the masses of the elements that form it.
m(CxHy) = mC + mH = 7.48 g + 2.52 g = 10.00 g
Step 2: Calculate the percent by mass of each element
%C = mC / mCxHy × 100% = 7.48 g / 10.00 g × 100% = 74.8%
%H = mH / mCxHy × 100% = 2.52 g / 10.00 g × 100% = 25.2%
Step 3: Divide each percentage by the atomic mass of the element
C: 74.8/12.01 = 6.23
H: 25.2/1.01 = 24.95
Step 4: Divide both numbers by the smallest one, i.e. 6.23
C: 6.23/6.23 = 1
H: 24.95/6.23 ≈ 4
The empirical formula of the hydrocarbon is CH₄.
17. Explain why chlorine gas can be prepared by electrolyzing an aqueous solution of NaCl
but fluorine gas cannot be prepared by electrolyzing an aqueous solution of NaF.
Answer:
Fluorine gas reacts with water.
Help plz:)))I’ll mark u Brainliest
Answer:
Explanation:
We want the energy required for the transition:
CO 2 ( s ) + Δ → C O 2 ( g )
Explanation:
We assume that the temperature of the gas and the solid are EQUAL.
And thus we simply have to work out the product:
2 × 10^ 3 ⋅ g × 196.3 ⋅ J ⋅ g − 1 to get an answer in Joules as required.
What would be the energy change for the reverse transition:
C O 2 ( g ) + → C O 2 ( s ) ?
Question 5 (5 points)
Complete the following sentences:
a)
is the least reactive alkall metal.
b)
is the most reactive alkali metal.
is the least reactive alkaline earth metal.
d)
is the most reactive alkaline earth metal.
e)
is the most reactive halogen
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Question 6.12
What is one movement that liquid water CANNOT do while on or at the Earth's surface? (GIVE RIGHT ANSWER OR I DELETE 100 POINTS)
Answer:
One movement that i can't do is float in mid air
Explanation:
What does pressure measure
Answer:
Pressure measurement is the analysis of an applied force by a fluid (liquid or gas) on a surface. Pressure is typically measured in units of force per unit of surface area.
hope this helps! mark as brainlist! :D
Answer:
THIS IS YOUR ANSWER I HOPE IT IS HELPFUL PLZ MARKS ME BRANILY1. For each of the following formulas:
1) if ionic, write the formulas of the ions; if covalent, draw the Lewis structure
2) For each covalent compound, describe the electronic and molecular geometry
3) For each covalent compound, describe the hybridization of the central atom
4) Name each compound, except the organic one.
5) How many sigma and how many pi bonds does each compound have?
MnSO4 CH3NH2 PCl5 O2 LiF
Answer:
See Explanation
Explanation:
The ionic compounds are; MnSO4 and LiF
The covalent compounds are; CH3NH2, PCl5 and O2
1) The formulas of the ions are;
MnSO4 - Mn^2+ SO4^2-
LiF - Li^+ F^-
The structure of each of the three covalent molecules is shown in the images attached to this answer.
2) CH3NH2 - Has a tetrahedral molecular geometry and electronic geometry
PCl5 - Has a trigonal bipyramidal molecular geometry and electronic geometry
O2 - Has a linear molecular geometry and electronic geometry.
3) CH3NH2 is sp3 hybridized
PCl5 is sp3d hybridized
O2 - is sp2 hybridized
4) MnSO4 - Manganese II sulphate
PCl5 - Phosphorus pentachloride
O2 - Oxygen molecule
LiF- Lithium fluoride
5) PCl5 - Five sigma bonds and no pi bond
CH3NH2 - 6 sigma bonds and no pi bond
O2 - 1 sigma bond and 1 pi bond
-4. A student learns that all of the particles within an object possess kinetic energy. Based on this fact,
the student can conclude that all of the particles in the object-
A. Contains the same atoms. B. Are hotter than their surroundings C.Are in motion. D. Are covalently bonded
Answer:
C
Explanation:
The correct option is option C. which is "are in motion".
All the particles inside an object have kinetic energy, which implies that the particles are moving. Kinetic energy is the force that drives an object's or its constituent parts in motion. As a result, it can be inferred from this fact that the object's particles are in motion.
Options A, B, and D are not necessarily true based on the given information. The fact that particles have kinetic energy does not imply that they contain the same atoms (option A), are hotter than their surroundings (option B), or are covalently bonded (option D). These characteristics are not directly related to the presence of kinetic energy in particles.
Therefore, option c is the correct option.
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How much potassium chloride is needed to make 0.500 m solution with 1.50 L of water?
Answer:
55.9 g KCl.
Explanation:
Hello there!
In this case, according to the definition of molality for the 0.500-molar solution, we need to divide the moles of solute (potassium chloride) over the kilograms of solvent as shown below:
[tex]m=\frac{mol}{kilograms}[/tex]
Thus, solving for the moles of solute, we obtain:
[tex]mol=m*kilograms[/tex]
Since the density of water is 1 kg/L, we obtain the following moles:
[tex]mol=0.500mol/kg*1.50kg\\\\mol=0.75mol[/tex]
Next, since the molar mass of KCl is 74.5513 g/mol, the mass would be:
[tex]0.75mol*\frac{74.5513g}{1mol}\\\\55.9g \ KCl[/tex]
Regards!
No bots No bots No bots No bots
Answer:
Solution given:
8.
4 hydrogen 1 oxygen
9.
4 hydrogen
2oxygen
Required reaction is:
2H2+O2➔2H2O
now
10.
oxygen have 16 amu than total mass in the left side of oxygen is:
16×2=32 amu of Oxygen
11.
total mass of Oxygen in product side is;
16×2=32 amu of Oxygen
Find the molarity of iodide ions in a solution obtained by dissolving 1.97 g of ZnI2(s) and enough water to form 34.2 mL of solution. Assume complete dissociation of ZnI2(aq) into ions. The molar mass of ZnI2 is 319.22 g/mol. Give the answer in mol/L with 3 or more significant figures.
Answer: The molarity of iodide ions in given solution is 0.181 M.
Explanation:
Given: Mass = 1.97 g
Volume = 34.2 mL (1 mL = 0.001 L) = 0.0342 L
Molar mass of [tex]ZnI_{2}[/tex] = 319.22 g/mol
Moles is the mass of substance divided by its molar mass. Hence, moles of [tex]ZnI_{2}[/tex] are calculated as follows.
[tex]Moles = \frac{mass}{molar mass}\\= \frac{1.97 g}{319.22 g/mol}\\= 0.0062 mol[/tex]
Molarity is the number of moles of a substance present in liter of a solution.
So, molarity of given solution is calculated as follows.
[tex]Molarity = \frac{moles}{Volume (in L)}\\= \frac{0.0062 mol}{0.0342 L}\\= 0.181 M[/tex]
Thus, we can conclude that molarity of iodide ions in given solution is 0.181 M.
How is weather ,climate , and biodiversity on earth interconnected?
Answer:
Biodiversity can be seen within species, between species, and within and between ecosystems. Although biodiversity is hard to measure on a global scale, in recent years there has been scientific consensus that the planet’s biodiversity is in decline. That’s not great news, because in general, the more species that live in an area, the healthier that ecosystem is—and the better off we humans are.
Explanation:
When 6.13 g of a certain molecular compound X are dissolved in 90. g of formamide (NH2COH), the freezing point of the solution is measured to be 2.1 °C. Calculate the molar mass of X. If you need any additional information on formamide, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to the correct number of significant digits.
Answer:
321.6 g/Mol
Explanation:
mass of solvent in kilograms = 90g/1000 = 0.09 Kg
Given that;
ΔTf = Kf . m . i
Where;
Kf = freezing point constant = 4.25 °C/Kg mol
m = molality of the solution
i = Van't Hoff factor = 1 (since the substance is molecular)
ΔTf = freezing point of pure solvent - freezing point of solution
freezing point of pure solvent = 3 °C
ΔTf = 3 °C - 2.1 °C
ΔTf = 0.9 °C
0.9= 4.25 * 6.13/M/0.09 * 1
0.9= 26.0525/M * 1/0.09
0.9 = 26.0525/0.09 M
0.9 * 0.09M = 26.0525
M = 26.0525/0.9 * 0.09
M= 321.6 g/Mol
A saturated solution of sucrose in 500.0 mL of boiling water is cooled to 20.0 0C. What mass of rock candy will be formed?
Answer:
1280.5g
Explanation:
1.34 x 10^24 molecules of CH4 is how many moles
Answer:
3.4e+25
Explanation:
One mole of methane or CH₄ contains 6.02 × 10²³ molecules. Then, number of moles of methane containing 1.34 × 10²⁴ molecules is 2.25.
What is Avogadro number ?One mole of a substance is its amount containing 6.02 × 10²³ atoms or molecules. This number is called Avogadro number. One mole of every elements contains Avogadro number of atoms.
Similarly one mole of every compound contains 6.02 × 10²³ molecules. The mass of one mole of compound is called its molar mass. The number of moles of the compound can be determined by dividing the given mass by molar mass.
Methane is a covalent compound formed from carbon and hydrogen atoms. One mole of methane contains 6.02 × 10²³ molecules of CH₄ . Hence number of moles of of 1.34 × 10²⁴ molecules of methane is:
1.34 × 10²⁴/6.02 × 10²³ = 2.25 .
Hence, the number of moles of CH₄ that contains 1.34 × 10²⁴ molecules is 2.25 moles.
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Draw the major organic product in the reaction scheme. Be sure to clearly show stereochemistry (if applicable). The starting material is an alkyne where carbon 1 is bonded to cyclopentane and carbon 2 is bonded to H. Step 1 is N a N H 2. Step 2 is C H 3 I. Step 3 is sodium in liquid ammonia. Draw the major organic product.
Answer:
See answer below
Explanation:
The picture below will show you the final product and mechanism.
In the first step, the NaNH₂ is a strong base, so, this base will substract the hydrogen from carbon 2, to generate a negative charge there, and then, carbon 2 becomes a nucleophyle.
As a nucleophyle it will attack to the CH₃I in the next step, and it will attach to the CH₃.
The second step is just a regular step to reduce the triple bond of the alkyne to alkane or alkene, this will depend on the quantity of the reactant. In this case, an alkene.
Hope this helps,,,,,,k
The table below shows the average summer temperature increases for regions in Canada. Which of the following conclusions is supported by the data?
Answer:
The mountain regions are warming more than the coast
Explanation:
The average rise in temperature was the greatest in the mountains, and the coast average was less than the mountain average.
Friction. That was the topic Sally and Sue are investigating in science. They used a small car and a ramp as seen in the
picture above. They knew that they slipped easily on waxed floors but not on carpet, so they decided change the
material on the surface of the ramp. They planned to use glass, carpet, aluminum foil, and sandpaper and run the car
down the ramp over each surface. The girls wrote a research question: Do rougher surfaces tend to create more
friction than smoother surfaces? They predicted that the greater the friction, the slower the car would travel down the
ramp
What would be the BEST hypothesis for their experiment?
A)
The smoother the ramp surface, the greater the car's speed.
B)
Heavier cars travel down the ramp faster than lighter cars.
The greater the angle of the ramp, the faster the car will move.
D)
Without lubrication, the car will travel slowest down the sandpaper
covered ramp.
Answer: A: The smoother the ramp surface, the greater the car's speed.
Explanation: I did the USA test prep
give an example of a primary income from the rest of the world
Answer:
(1) Income Associated with the Production Process
(a) Compensation of employees
(b) Taxes and subsidies on products and
production .
(2) Property Income
(a) Investment income:
• Dividends and withdrawals from income of
quasi-corporations
• Reinvested earnings
• Interest
(b) Rent .
I hope this is correct :-)
Determine the number of grams of solute needed to make each of the following molal solutions.
Answer:
a. 497g H2SO4.
b. 124g HNO3
Explanation:
Molality, m, is an unit of concentration defined as the moles of solute per kg of solvent.
a. The moles of solute, H2SO4 are:
1.16kg * (4.37mol / kg) = 5.07 moles H2SO4
Mass -Molar mass H2SO4: 98g/mol-
5.07 moles H2SO4 * (98g / mol) = 497g H2SO4
b. The moles of solute, HNO3 are:
1.97kg * (1.00mol / kg) = 1.97 moles HNO3
Mass -Molar mass HNO3: 63.01g/mol-
1.97 moles HNO3 * (63.01g / mol) = 124g HNO3
