The freezing point of a 1.324 m solution, prepared by dissolving biphenyl into naphthalene, is 71.12 ° C.
A solution is prepared by dissolving biphenyl into naphthalene. We can calculate the freezing point depression (ΔT) for naphthalene using the following expression.
[tex]\Delta T = i \times Kf \times m = 1 \times 6.90 \°C/m \times 1.324m = 9.14 \°C[/tex]
where,
i: van 't Hoff factor (1 for non-electrolytes)Kf: cryoscopic constantm: molalityThe normal freezing point of naphthalene is 80.26 °C. The freezing point of the solution is:
[tex]T = 80.26 \° C - 9.14 \° C = 71.12 \° C[/tex]
The freezing point of a 1.324 m solution, prepared by dissolving biphenyl into naphthalene, is 71.12 ° C.
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If 5 g is dissolved in 100 mL of solution, what is the percentage of the solution?
Answer:
tobacco
Explanation:
How do you determine the name of an element using protons, neutrons, and electrons?
Answer:How do you determine the name of an element using protons, neutrons, and electrons?
By knowing the number of protons, you know the atomic number. If you know the atomic number you know which element it is in the Periodic Chart. A good Periodic chart should give you enough information to determine the name of the element.
Explanation:
please mark me as brainliest
how does an indicator work
Answer: Indicators are substances whose solutions change color due to changes in pH
Explanation:
Answer:
EXPLANATION
Explanation:
[not sure exactly what you mean by indicator but here's my very basic answer lol] They are substances that change color due to changes in pH levels.
Muscle Activity
A
B
с
8. The flow of energy through an ecosystem
Sun Food ATP
involves many energy transfers. The diagram
below summarizes the transfer of energy that
eventually powers muscle activity. The process of cellular respiration is
represented by
a. arrow A, only
c. arrow B, only
b. arrow C, only
d. arrows A. B. and C
What is an observation of matter that is measured without changing the identity of the substance.
a. A physical Property
b. A chemical property
c. A physical change
d. A chemical change.
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling point.
Explanation:
Physical Property. have a great day..
is stretching a rubber band endothermic or exothermic
Answer:
exothermic
Explanation:
take a rubber band between the first two finger of each hand
stretch it, release, stretch is release over and over fast
put the rubber band on you cheek and feel the heat
You RELEASED HEAT, HEAT CAME OUT, HEAT EXITED THE RUBBER
so the process is EXO(EXITS)-THERMIC (HEAT)
High temperature refrigeration is that produced by:
Answer:
. an air-conditioning system
Look at the window on the left side of the simulation. It shows the reaction A + BC ⇌ AB + C. How does this reaction differ from the reaction by which ammonia is synthesized?
Answer:
A + BC → AB + C "single replacement reaction" while ammonia synthesis is a "synthesis reaction".
Explanation:
A single replacement reaction, is a reaction by which one element replaces an/other element in a compound.
It can be represented generically as: A + B-C → A-C + B This will most often occur if A is more reactive than B, thus giving a more stable product.
A synthesis reaction is a type of chemical reaction in which two or more simple substances combine to form a more complex product. The reactants may be elements or compounds, while the product is always a compound.
Example: ammonia synthesis,
N₂ + 3H₂ ⇄ 2NH₃
how often should gas appliances be checked for proper operation in order to prevent carbon monoxide poisoning?
Now experiment with the simulation. Send waves of various sizes at the three houses. See how large a wave has to be to destroy each kind of house. Write down your observations.
Answer:
Brick House: 22 feet
Wood House: 10 feet
Straw house: 5 feet
Explanation:
Ice waters melt to form liquid water The water spreads out to match the shape of its container after heating on the stove the water begins to boil and change into steam which statement is true about this process
Answer:the water starts to boil and creates steam
Explanation:
I need help with this
Answer:
I think that 142.5 is the answer.
what is the volume of the graduated cylinder what is the volume of the graduated cylinder
Answer real 100% Graduated cylinders commonly range in size from 5 mL to 500 mL. Some can even hold volumes of more than a liter.
Why does the total mechanical energy stay the same as kinetic and potential energy change?
total mechanical energy is the sum of kinetic energy and potential energy so it will remain same always
Answer:
Explanation:
Because the kinetic and potential energy are constant. A good example of kinetic and potential energy are throwing a ball up. It leaves your hand with kinetic energy. When it reaches the top it doesn’t have any kinetic force but potential energy equal to the kinetic energy the ball had when you threw it up. And, when it comes back to your hand it has the same kinetic energy it had when it left your hand. Thus, the sum of the kinetic energy plus potential energy is a constant.
Physical barriers that help prevent an individual from contracting diseases include __________. A. White blood cells, enzymes, tears, and skin B. Sweat, stomach acid, skin, and enzymes C. Sweat, tears, skin, and mucus membranes D. Enzymes, mucus membranes, stomach acid, and tears Please select the best answer from the choices provided. A B C D.
Answer:
The answer is - C. Sweat, tears, skin, and mucus membranes.
Explanation:
Liquid water (H2O) is formed when two gases, hydrogen (H2) and oxygen (O2), react. Why are the properties of water different than those of the reactant gases?
Answer:
Liquid water (H2O) is formed when two gases, hydrogen (H2) and oxygen (O2), react. ... The difference in the properties of water can be attributed to physical changes to the hydrogen and oxygen atoms on a subatomic level. The properties of the gases are combined to give water its properties.
Explanation:
I hope this helps
have a great day:)
good luck!
1. Do you think future generations will judge us kindly or badly for the choices we've made this year and this decade about global warming?
2. Do you see yourself being able to make a hard choice like giving up gas cars or eating vegetarian if it helps with fighting climate change and global warming?
3. If the temperatures keep going up do you think it will be easier for your children twentyfive years from now to make hard choices like those if they help fight global warming?
4. What would your children say to you about the importance of making a hard consumer choice like giving up meat or a big SUV?
5. What would you say back to your children in response?
6. Whose primarily to blame for global warming? The consumers like you and me? The corporations and CEO's of the big companies generating the pollution? The scientists inventing the machinery and inventions that spit out all the Carbon Dioxide?
7. Whose going to be responsible for fixing the problem? Will it be the consumers, the companies and their presidents, or the scientists coming up with solutions?
Answer:
1. Kindof because we tried our best to stop but we still do bad things.
2. I see myself making not being able because it is survival for me.
3.Yes I think it is hard choices because we need to make sure we don't repeat.
4. My children will say how is the SUV.
5. I would say itds pretty good but too much gas.
6. I think the consumer for adding lots of gas.
the periodic table is written in order of ?
Answer:
increasing atomic number
Explanation:
I am guessing that means the number of atoms in a chemical or whatever is on a periodic table
Erosion and weathering _____.
are usually slow processes
can only happen in dry climates
do not change landforms
do not significantly change Earth's surface
How does the equation below support the idea that matter is not created or destroyed?
6H20 + 6CO2 -----> C6H12O6+ 602
Answer:
The reaction 6CO2 + 6H2O ---> C6H12O6 + 6O2 is the chemical equation for photosynthesis. In this reaction, carbon dioxide and water
Explanation:
give me brainlest please
口
10. Which describes an element?
O They can combine with other elements to form atoms.
They were created in the Earth's core.
O They cannot be broken down any further.
O They were all discovered at the same time.
Someone just help me fr UWU
Answer:
They were created in the Earth's core.
The rest make no sense
PLZ HELP!!
Why do you think only one material is able to pass through the membrane? *think about what kind of materials can diffuse through the membrane*
Here is a picture that might help :)
answer asap please!!!!!!!!!!!!!!!!!!!!!
Answer: c.
Explanation: Because it will increase temperature on thermometer y will decease.
Calculate how many moles of potassium (K) are present in a sample of 8.12x10^23 atoms of K
Answer:
1.35 moles
Explanation:
Calculate how many
of potassium (K) are present in a sample of 8.12x10^23 atoms of K
6.02 X 10^23 atoms are 1 mole. how many 6.02 X 10^23 are in
8.12 X 10^23
divide 8.12 X 10^23 into sets of 6.02 X 10^23
(8.12 X 10^23)/(6.02 X 10^23) =1.35 moles
what is the difference between thermal energy and heat ?
There is really no difference thermal energy and heat are pretty the same thing.
Answer:
Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy.
identify ways to reduce the risk of liquid bumping while heating.
The most common way of preventing bumping is by adding one or two boiling chips to the reaction vessel. However, these alone may not prevent bumping and for this reason it is advisable to boil liquids in a boiling tube, a boiling flask, or an Erlenmeyer flask.
How many electron regions is in a nitrate ion using molecule geomerty
When forming an ionic bond, how does the configuration of valence electrons change
Answer:
Ionic bonds are a class of chemical bonds that result from the exchange of one or more valence electrons from one atom, typically a metal, to another, typically a nonmetal. This electron exchange results in an electrostatic attraction between the two atoms called an ionic bond.
Explanation:
Answer:
The electrons are transferred from one atom to another. The atom that loses electrons becomes positive.
Explanation:
I don't really understand what form of an answer you need but I hope this helps?
PLEASE HELP ASAP
Question 2 of 10
Which is required for karst topography to form?
A. Limestone
B. Basalt
C. Quartz
O D. Granite
Answer:
Limestone
Explanation:
Limestone is required , hope it helps :)
A is the answer
Answer: Karst is a topography formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum. It is characterized by underground drainage systems with sinkholes and caves
Which state(s) of matter is/are easily compressible? Select all that apply
solid
liqued
gas
Answer:
gas is the answer
Explanation:
gasses are characterized by having no definite shape or volume.
WILL MARK AS BRAINLIEST IF CORRECT
[tex]\huge\bold{\purple{\bold{⚡Q16. B⚡}}} [/tex]
Because: The balanced equation is - 2BrF5--->Br2+5F2[tex]\huge\bold{\orange{\bold{⚡Q17.A,C,E⚡}}} [/tex]
A because 2 is in subscriptNot B because there are 3 atoms of oxygen in ozone, not in oxygen. C because 3 indeed is its coefficient Not D because 3 is coefficient not subscriptE is trueNot F because 3 is a coefficient, not 2