Sucrose doesn't show appreciable dissociation in water, so i≈1 in this case. by extension, −7.3°C is the approximate freezing point of this solution.
What is the freezing point?The temperature at which a liquid solidifies.
Sucrose doesn't show appreciable dissociation in water, so i≈1 in this case. by extension, −7.3°C is the approximate freezing point of this solution.
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What is the mole fraction of NaBr in
an aqueous solution that contains
20.1% NaBr (weight/weight %)?
Molar Mass
NaBr: 102.89 g/mol
H₂O: 18.016 g/mol
Enter text here
Answer:
4.22% NaBr
Explanation:
To find the mole fraction of NaBr, you need to (1) determine the mass of the solute (NaBr) and the solvent (H₂O), then (2) convert the mass of the solute and solvent to moles (via the molar masses), and then (3) calculate the mole fraction of NaBr. The final answer should have 3 sig figs to match the sig figs of the given value (20.1%). Because you are given a percent less than 100%, you can assume that the percent (20.1%) is equal to the mass of the solute (20.1 g).
(Step 1)
100% - 20.1 % NaBr = 79.9% H₂O
20.1% NaBr = 20.1 g NaBr
79.9% H₂O = 79.9 g H₂O
(Step 2)
Molar Mass (NaBr): 102.89 g/mol
20.1 g NaBr 1 mole
------------------- x --------------------- = 0.195 mole NaBr
102.89 g
Molar Mass (H₂O): 18.016 g/mol
79.9 g H₂O 1 mole
------------------ x ------------------- = 4.43 moles H₂O
18.016 g
(Step 3)
moles of solute
Mole Fraction = ---------------------------------------------------- x 100%
moles of solute + moles of solvent
0.195 mole NaBr
Mole Fraction = -------------------------------------------------------- x 100%
(0.195 mole NaBr) + (4.43 moles H₂O)
Mole Fraction = 4.22% NaBr
Answer:
0.0422
Explanation:
Right on Acellus
what's the name of the compound?
HELP!!! LOTS OF POINTS AND I GIVE BRIANLEST NO FAKE ANSWERS
Given the following data for water:
Heat of fusion = 334 J/g
Heat of vaporization = 2,256 J/g
Specific heat of solid = 2.09 J/(g °C)
Specific heat of liquid = 4.184 J/(g °C)
Specific heat of gas = 1.84 J/(g °C)
Calculate how much energy is needed to change 50.0 grams of ice at −15.0 °C to liquid water at 50.0 °C. (3 points)
a
11,900 J
b
16,300 J
c
18,300 J
d
21,100 J
Answer:
18300 J
Explanation:
this is because the amount of energy can be changed
Question 5 of 10
Platinum has a density of 21 g/cm³. A platinum ring is placed in a graduated
cylinder that contains water. The water level rises from 4.0 mL to 4.2 mL
when the ring is added. What is the mass of the ring?
A. 2.6 g
OB. 3.8 g
OC. 4.2 g
OD. 5.2 g
B
Answer:
4.2 g
Explanation:
The VOLUME of the ring is 4.2 - 4.0 = .2 ml = .2 cm^3
the MASS of the ring is this times the density
.2 cm^3 * 21 g/cm^3 = 4.2 g
Answer:
the answer is c
Explanation:
density is mass/volume
so mass=density × volume
but we take the change is volume that is v2-v2=4.2-4=0.2ml
but the density is in gm/cm^3 so we should convert ml into cm^3. eventually they are equal so mass=21×0.2=4.2
In a recent study, 50 males used a new weight-loss supplement, and 37 of them experienced weight loss after two weeks: In the same study, 20 females used
the same supplement, and 13 of them experienced weight loss after two weeks.
Fill in the blanks below to make the most reasonable statement possible.
The new weight-loss supplement was less effective on (Choose one) in the study. That is because only % of them lost
weight after two weeks, whereas % of the (Choose one) lost weight after two weeks.
Answer:
The new weight-loss supplement was less effective on females in the study. That is because only 65% of them lost weight after two weeks, whereas 74% of the males lost weight after two weeks.
Explanation:
37 out of 50 males lost weight after two weeks, so 74% of males lost weight ( (37 · 2)/(50 · 2) ). 13 out of 20 females lost weight after two weeks, so 65% of females lost weight ( (13 · 5)/(20 · 5) ). This means the supplement was less effective on females because males had a higher percentage of losing weight.
Hope this helps !! :D
What are oil traps?
Answer:
A device in which oil can be trapped, or which makes use of oil to trap something else I think
acid base and solutions
The Arrhenius definition of an acid states that an acid ionizes or dissociates to from hydroxide ions in solution.
What is the Arrhenius definition of acid?The definition of solutions was more given by the traditional scientist in smart solutions, which are natural solutions, like substances that - easy solutions, aqueous like bases.
In this case, Arrhenius definition of an acid states that an acid ionizes or dissociates to from hydroxide ions in solution.
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Help pls need it!:))
Answer:
[tex]\textsf {A}[/tex]
Explanation:
[tex]\textsf {The effect of a catalyst on the energy of a reaction system }\\\textbf {is that it reduces the activation energy.}[/tex]
Answer:
it reduces the activation energy (option A)
Explanation:
we know that a catalyst reduces the activation energy because it speeds up a reaction (that is what a catalyst is--a substance that speeds up a reaction [whilst leaving it unchanged chemically]. )
So, if a catalyst is speeding up the time it takes for a reaction to occur, it is logically lowering the minimum energy that is needed for the reaction to occur.
This can best be expressed in option A, because it lowers the activation energy
Explain how they would make solutions of the sulfuric acid at five different concentrations
The sulfuric acid can be constituted into different concentrations using distilled water as a diluent.
What is dilution of acid?Dilution of acid is defined as the decrease in the concentration of an acid using water.
For sulfuric acid to be diluted, it is slowly added to distilled water using the following guidelines:
Add 150 ml of water to the beaker and add the desired amount of acid. This will give a diluted concentration of the given acid.Learn more about acid here:
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Which of the following is a simple design model that uses the concepts define, optimize, and develop solutions iteratively and in any order?
A. Infused Design
B. FORFLOW
C. Munich Procedural Model
D. Next Generation Design Model
The Munich Procedural Model is a simple design model that uses the concepts define, optimize, and develop solutions iteratively and in any order. C
What is the Munich procedural design?The Munich procedural model is a design that illustrates several opportunities regarding the order in which design process and stages beyond mere iteration should take.
A procedural model commonly used for development is the V-model.
Hence, the Munich Procedural Model is a simple design model that uses the concepts define, optimize, and develop solutions iteratively and in any order.
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How many moles are in a gas with a temperature of 21°C, pressure of 1,351 mmHg and a volume of 2,000 mL
Answer:
.147 moles
Explanation:
PV = n RT choose the correct "R" to be 62.364 L torr /(K-mol)
T needs to be in K (so add 273.15)
1351 torr * 2 L = n * 62.364 * (21 + 273.15 )
solve for n = .147 moles
The velocity is ___ when the distance is kept the same and the time is halved
Answer:
Velocity = distance / time
if distance is same and time is 1/2
Velocity = distance / time/2
velocity = 2 (distance /time)
Velocity,= 2 * velocity
Velocity will be doubled
Design a controlled experiment to test your hypothesis. A controlled experiment is one that only tests one variable. All other variables must remain the same. Make a drawing below that shows how you will set up your experiment. Then, write a description of the one factor that will vary and the two factors that will remain the same.
The problem is not found here but a possible experiment might be to measure the amount of product from a chemical reaction.
What is an experiment?An experiment is a procedure used to verify a working hypothesis obtained by applying the scientific method.
Experimental variables that can be tested include, for example, temperature, amount of product from a chemical reaction, etc.
In conclusion, the problem is not found here but a possible experiment might be to measure the amount of product from a chemical reaction.
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Aryan want to deposit silver on an iron spoon using silver nitrate as electrolyte. Which terminal of the battery he should connect the spoon? What material should the other electrode be made of?
Silver from the anode gets dissolved to reach the cathode, where the spoon will be plated.
What is electroplating?Electroplating is a way of electrolysis, where a thin layer of metal is used to plate a determined object. It is a kinda process to purify a material you want.
The anode contains the metal you want to plate with, in this case, the Ag.
The anode contains the half-reaction of oxidation so:
Ag(s) → Ag ⁺ (aq) + e⁻
In the cathode, you have the spoon, which it takes place the half-reaction of reduction:
Ag ⁺ (aq) + e⁻ → Ag(s)
The electrolytic cell, where the redox reaction takes place, must be filled with a AgNO₃ solution.
Silver from the anode gets dissolved to reach the cathode, where the spoon will be plated.
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At ground level, how are rain and hail similar?
They are forms of water in its liquid state.
They occur when the temperature is below freezing.
They can occur when the air is hot and moist.
They are most common in the winter.
They are forms of water in its liquid state at ground level. Thus, the correct option is A.
What is hailstrom?Precipitation, or water in the atmosphere, forms hail. When water drops freeze together in the chilly higher parts of thunderstorm clouds, hail is the result.
When a water droplet is lifted by an updraft from a thunderstorm over the freezing point of the atmosphere, hail is created. The super-cooled water or water vapor that the frozen water droplet accretes later freezes when it comes into touch with it. A hailstone grows as a result of this process.
When water vapor from the atmosphere condenses into liquid water droplets, they become heavy enough to fall as a result of gravity.
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Answer:A
Explanation:
.
M1 = 3M M2 = 1.25M V1 = V1=.125L unkown What is V2?
0.3 L is the final volume when M₁ = 3 M, V₁ = 0.125L, M₂ = 1.25M.
What is volume?The amount of space occupied by a three-dimensional figure as measured in cubic units.
Given data:
M₁ = 3 M
V₁ = 0.125L
M₂ = 1.25M
V₂ = ?
Solution:
M₁V₁ = M₂V₂
3 M × 0.125L = 1.25M × V₂
V₂ = 0.3 L
Hence, 0.3 L is the final volume.
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elemental phosphorus occurs as tetratomic molecules, p4. What mass in grams of chlorine gas is need to react completely with 455g of phosphorus to form phosphorus pentachloride?
P₄ + 10Cl₂ → 4PCl₅
mol P₄ = 455 : 123.895 g/mol = 3.672
mol Cl₂ = 10 x 3.672 = 36.72
mass Cl₂ = 36.72 x 71 g/mol = 2607.12 g
In the following half equation, which is the oxidizing agent? How & why?
NO3- (aq) + 4H+ (aq) + 3e- —> NO (g) + 2H2O
A) NO3-
B) H+
C) e-
D) NO
E) H2O
Answer: A
Explanation:
Oxidation is the process through which electrons are gained. This indicates that only organisms on the electron side have the potential to be oxidizing agents. c, d, and e are, by definition, eliminated.
We also know that H+ is in the +1 oxidation state. The same is true for 'H' in H2O... it doesn't change oxidation states
Therefore, the answer must be a) nitrate
examples of molecular compound
Answer:
Molecular compounds are inorganic compounds that take the form of discrete molecules. Examples include such familiar substances as water (H2O) and carbon dioxide (CO2). These compounds are very different from ionic compounds like sodium chloride (NaCl).
Help please!
A new element with atomic number 116 was discovered in 2000. In 2012 it was named livermorium, Lv. Although Lv is radioactive and short-lived, its chemical properties and reactivity should follow periodic trends.
a. Determine the electron configuration for the valence electrons of Lv in the ground state. (2 pts)
b. It has been suggested that Lv can form a 4+ ion. Identify what would be the electron configuration for the valence electrons for the Lv4+ ion? (1 point)
The electronic configuration of Lv element is [tex]5f^{14} 6d^{10} 7s^2 7p^4[/tex].
The electronic configuration of [tex]Lv^{+4}[/tex] is [tex]5f^{14} 6d^{10} 7s^2[/tex] .
What is electronic configuration?Electronic configuration, also called electronic structure, is the arrangement of electrons in energy levels around an atomic nucleus.
And also the possible union with hydrogen can give two possible compounds:
[tex]LvH_2 \;or LvH_4[/tex]
This is because the Livermorio compound can have two different oxidation states with the values 2 and 4. When reacting with the hydrogen that its charge is +1, these would be the two possible equations of a client to the different oxidation states with the ones that might react Lv.
It is a synthetic chemical compound and its number in the periodic table is 116.
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#1
Atomic no=116
Lies ahead of Renedium -86
Electronic configuration
[Rn]5f¹⁴6d¹⁰7s²7p⁴#2
Lv^4+ means 4 electrons donated
So it gets removed from p orbital
[Rn]5f¹⁴6d¹⁰7s²
1) Consider this row in the periodic table. What changes can you predict based on what information is provided by the boxes for each element?
A) The elements change from solids to gases and the valence electrons decrease in number.
B) As you move across the row, the number of electrons increases and reactivity also increases.
C) They have different atomic numbers and mass numbers; they have the same number of valence electrons.
D) Both the atomic numbers and the mass numbers increase; the least reactive element is in the last box.
USA test prep question
Answer:
B) As you move across the row, the number of electrons increases and reactivity also increases.
Explanation:
The periodic table is arranged in a way that if you go across a period, the number of protons, neutrons, and electrons in an element increases. In terms of reactivity, the most reactive elements are the ones which have a high electronegativity. The electronegativity of the elements increases as you travel to the right and upwards on the periodic table.
Franklin Roosevelt promised the American people a "new deal," a pledge he made actually before he was elected, at the Democratic National Convention in 1932.
The New Deal program was to help the American economy recover from the Great Depression.
Who was Franklin Roosevelt?Franklin Delano Roosevelt was an American politician and attorney who served as the 32nd president of the United States from 1933 until his death in 1945.
Roosevelt promised the American people a "New Deal" if he was elected president in 1932. The goal of this New Deal program was to help the American economy to recover from the Great Depression.
Roosevelt's deal was based on providing economic relief to citizens, reforming institutions that failed during the early 1930's, and helping the overall economy to recover. This popular program lead FDR to be elected president 4 times.
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What is the isomer of a compound with an empirical formula of C₂H₆O₂?
Answer:
An isomer is a molecule with the same molecular formula as another molecule, but with a different structure. Isomers contain the same number of atoms of each element, but have different arrangements of their atoms. Isomers do not necessarily share similar properties, unless they also have the same functional groups.
What is one advantage of wind and hydroelectric power?
A. They are effective in any type of environment.
B. Neither harms wildlife.
C. Neither produces pollutants.
D. Both are inexpensive.
What is one advantage of wind and hydroelectric power?
A. They are effective in any type of environment.
B. Neither harms wildlife.
C. Neither produces pollutants.
D. Both are inexpensive.
Explanation:
one of the qnswer is flood control, irrigation support, and clean drinking water
You are watching tv and you see something on the corner of your eye what do you do and you're home alone
Talk to the doctor if you see something in the corner of your eye.
What is a visual hallucination?Visual hallucinations involve seeing things that aren't there.
It's called a visual hallucination, and it can seem like your mind is playing tricks on you. Beyond being scary or stressful, it's also usually a sign that something else is going on.
So if it's happening to you, talk to your doctor. That's the first step toward getting better.
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If you had 6 mol of oxygen and 12 mol of mercury, what would be the limiting reactant? show your work
The limiting reactant between the reaction of 6 moles of oxygen and 12 moles of mercury is mercury (Hg)
Balanced equation4Hg + O₂ —> 2Hg₂O
From the balanced equation above,
4 moles of Hg reacted with 1 mole of O₂
How to determine the limiting reactantFrom the balanced equation above,
4 moles of Hg reacted with 1 mole of O₂
Therefore,
12 moles of Hg will react with = 12 / 4 = 3 moles of O₂
From the above calculation, we can see that only 3 moles of O₂ out of 6 moles given is required to react completely with 12 moles of Hg.
Thus, Hg is the limiting reactant and O₂ is the excess reactant .
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what is the name of this compound?
The compound above is a cyclic (ring) compound.
What are organic compounds?Organic compounds are compounds which contains carbon and hydrogen.
Some classes of organic compounds include the following:
AlkanesAlkenesAlkynesAkanolsAlkanonesEstersKetonesAminesSo therefore, the compound above is a cyclic (ring) compound.
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Polyester and Nylon are examples of synthetic materials called polymers.
A. True
B. False
Answer:
true is correct
Polyester and Nylon are examples of synthetic materials called polymers. This statement is True.
Polymers are large molecules composed of repeating subunits called monomers, which are chemically bonded together. In the case of polyester, it is made from a polymer called polyethylene terephthalate (PET), while Nylon is made from polyamide monomers. These polymers are created through polymerization processes that combine smaller molecules to form long chains.
Synthetic polymers like polyester and nylon are widely used in various applications due to their desirable properties, such as strength, durability, and resistance to chemicals and moisture.
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Which sequence represents the relationship between temperature and volume as explained by the kinetic-molecular
theory?
higher temperature → less kinetic energy
higher temperature → more kinetic energy→more space between particles → higher volume
less space between particles → higher volume
higher temperature → more kinetic energy less space between particles → lower volume
higher temperature → less kinetic energy→more space between particles lower volume
The correct sequence is higher temperature→ more kinetic energy→ more space between particles→ higher volume.
According to the postulates of Kinetic gas theory:
Postulate 1: It states that the average kinetic energy of gas particles is proportional to the absolute temperature of the gas.
Which states that the higher temperature, the higher the kinetic energy of the molecules, which is the start of the sequence of the relationship between temperature and volume.
Postulate 2: Average kinetic energy is proportional to the square of the speed, it shows that at higher the kinetic energy the faster the molecules will move.
Postulate 3: As the particles move faster, the particles will collide more frequently so they will move away from each other, occupying more space.
Postulate 4: More space between the molecules results in more volume.
So, the complete and correct sequence is higher temperature → higher kinetic energy (higher speed) → more space → more volume.
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Convert -145 °F to kelvins. Round to the nearest whole number.
Answer:
175K
Explanation:
(-145°F − 32) × 5/9 + 273.15 = 174.817K
174.817 ---> 175 (Rounded to whole number/ ones place)