Answer:
Explanation:
ΔT = imK
0.93 = (2)(m)(1.86)
Solve for m (molality) and use it in ΔT = imK where i = 2 and K = 0.512 and find ΔT. Add that value to 100C to find boiling point
The vapor pressure of liquid octane, C8H18, is 40.0 mm Hg at 318 K. A sample of C8H18 is placed in a closed, evacuated container of constant volume at a temperature of 448 K. It is found that all of the C8H18 is in the vapor phase and that the pressure is 71.0 mm Hg. If the temperature in the container is reduced to 318 K, which of the following statements are correct?
a. The pressure in the container will be 42.8 mm Hg.
b. Liquid octane will be present.
c. Only octane vapor will be present.
d. Some of the vapor initially present will condense.
e. No condensation will occur.
Answer:
a, d
Explanation:
a. The pressure in the container will be 42.8 mm Hg.
d. Some of the vapor initially present will condense.
Help please !!!!!!! 10 points for this
20 POINTS! NEED HELP!!!
When naming covalent bonds, do all of the following except?
1. use prefixes
2. write the left-most element first
3. add -ide to the end of the 2nd element
4. write the metal first
Answer:
number 2
Explanation:
even though i have never done this i still got it right
Because metals do not form covalent bonds, when naming covalent bonds, all the given rules apply except write the metal first; option 4.
What are covalent bonds?Covalent bonds are bonds formed by the sharing of valence electrons between the atoms involved in the bonding.
In naming covalent bonds, the following rules are applied:
Name the non-metal furthest to the left on the periodic table by its elemental name.Name the other non-metal by its elemental name and an -ide ending.Use the prefixes mono-, di-, tri-, tetra etc. to indicate the number of that element in the molecule.If the first prefix is mono, it is not written add -ide to the end of the second elementFor example, CO₂, is carbon dioxide.
Therefore, when naming covalent bonds, all the given rules apply except write the metal first because metals do not form covalent bonds.
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I need help can somebody help me
Answer:
they slow down
Explanation:
Water molecules slow down as they lose energy. The molecules become closer together and decrease the volume.
How many moles of hydrogen sulfide are contained in a 77.7-8 sample of this gas?
Select one:
o
a. 0.44mol
O b.4.56mol
O c. 38.5mol
O d. 111.8mol
e. 2.28mol
Answer:
its either C or D my guess is C though because 35.0g of hyddrogen is =1.03 mol
Explanation:
what mass, in grams, of CO2 and H20 N
is formed from 2.55 mol of propane?
Answer: The mass of [tex]CO_2[/tex] and [tex]H_2O[/tex] produced are 336.6 g and 183.6 g respectively.
Explanation:
The combustion reaction between propane and oxygen leads to formation of carbon dioxide and water.
Law of Conservation of mass states that the mass will remain constant for a balanced equation. This is carried out when the total number of atoms on reactant side is same as the total number of atoms on the product side. Thus the equation must be balanced.
[tex]C_3H_8+5O_2\rightarrow 3CO_2+4H_2O[/tex]
a) 1 mol of propane produces = 3 moles of [tex]CO_2[/tex]
Thus 2.55 mol of propane produces = [tex]\frac{3}{1}\times 2.55=7.65 moles of [tex]CO_2[/tex]
mass of [tex]CO_2=moles\times {\text {molar mass}}=7.65mol\times 44g/mol=336.6g[/tex]
b) 1 mol of propane produces = 4 moles of [tex]H_2O[/tex]
Thus 2.55 mol of propane produces = [tex]\frac{4}{1}\times 2.55=10.2 moles of [tex]H_2O[/tex]
mass of [tex]H_2O=moles\times {\text {molar mass}}=10.2mol\times 18g/mol=183.6g[/tex]
The mass of [tex]CO_2[/tex] and [tex]H_2O[/tex] produced are 336.6 g and 183.6 g respectively.
Which substances are released during cellular respiration?
Use complete sentences to explain how the mass of oxygen is conserved during cellular respiration.
What is the activation energy of a reaction?
A. The energy that is given off when a reaction happens
B. The kinetic energy of the colliding molecules
C. The speed at which the molecules must be moving in order to
react
D. The energy the molecules must have in order to react
SUBMIT
Answer:
D i took it aswell
Explanation:
The energy the molecules must have in order to react. Hence, option D is correct.
What is activation energy?Activation energy is the sufficient amount of energy necessary to initiate a chemical reaction.
It can also be said as the minimum amount of energy needed to energize molecules or atoms so that they can undergo a chemical reaction or transformation.
Hence, the energy the molecules must have in order to react.
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An attractive force between all objects that have mass is knows as ____________. The more mass, the more of this type of force. The more distance between objects, the less of this type of force.
A. Friction
B. Normal force
C. Air resistance
D. Gravity
Answer:
C . Air resistance
Explanation:
Answer:
Gravity (D)
Explantion:
The more mass the more gravitational force
the more distance the less gravitational force
In the isotope Carbon-14, what does the number 14 represent?
Answer:
number of tamed protons and neutrons
what is the geolgic tike scale based on?
Answer: The geologic time scale is the “calendar” for events in Earth history. It subdivides all time into named units of abstract time called—in descending order of duration—eons, eras, periods, epochs, and ages.
Explanation: I learned about it the other day
how many moles are in 1.505x10^24 molecules of surcrose
Answer:
2.499 moles of sucrose
Explanation:
Divide by Avogadro's number
Consider the reaction between a solution of molecule A and a solid block of molecule B. In general, for a reaction to occur, the reactant molecules must be in contact with each other. Therefore, increasing the frequency of collisions between A and B molecules allows the reaction to occur more quickly. Identify the change in reaction condition that will increase the frequency of the molecular collisions.
Answer:
Decreasing the volume of solvent in the solution of molecule A
Explanation:
We know that one of the factors that affect the rate of reaction is the concentration of the reactants. The greater the concentration of reactants, the faster the rate of reaction (the greater the frequency of collision between reactants).
Hence, when we decrease the volume of solvent in the solution of molecule A, the concentration of the solution increases and consequently more particles of molecule A are available to collide with particles of molecule B resulting in a higher rate of reaction.
mhanifa, can you answer this question pls?
Solve for x.
1. 5(2x +15) = 55
2. 9(6x +4) = 166
3. 3(8x +20) = 356
Answer:
1. x=-2
2. x=65/27
3. x=37/3
Explanation:
Isolate x
1. Divide by 5: 2x+15=11
2x=11-15
x=-2
2. Distribute: 54x+36=166
54x=166-36
x=130/54
Simplify by dividing by 2: x=65/27
3. Distribute: 24x+60=356
24x=356-60
x=296/24
Simplify by dividing by 8: x=37/3
The subatomic particle that is negatively charged and found in the space around the nucleus is
Answer: Electrons
Explanation:
An atom is the smallest unit of the matter and contains neutrons, protons and electrons as subatomic particles.
Neutrons which are neutral and protons which are positively charged are present in the nucleus.
The electrons which are negatively charged revolve around the nucleus in orbits called as shells.
An adaptation is best described as occurring over which time scale? *
(10 Points)
O A. over many eras
O B. over many generations
O C. over one generation
D. over the lifetime of one individual
Answer:
over many eras
Explanation:
In an ecosystem, an adaptation is best described as occurring over many generations.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
There are various types of ecosystem present in the environment.
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Heats makes particles vibrate _________ (btw the options are in the pic)
Answer:ok so When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.
hope this helps have a nice day❤️
Explanation:
1. What is an ionic bond?
Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.
Explanation:
ionic bond is a bonding between a non-metal and a metal, that occurs when change atoms (ions) attract.
Which is the most soluble substance listed
what is the effect of heat and light on chemical reaction
A closed, nonreactive system contains species Aand Bin vapor/liquid equilibrium. Species Ais a very light gas, essentially insoluble in the liquid phase. The vapor phase contains both species Aand B. Some additional moles of species Bare added to the system, which is then restored to its initial T and P. As a result of the process, does the total number of moles of liquidincrease, decrease, or remain unchanged?
Answer:
Remain unchanged.
Explanation:
The total number of moles of liquid remain unchanged as the some moles of species B are added to the system because specie B that is added in the liquid phase is again restored after addition. If the specie B did not restored after addition to the liquid phase so the total number of moles increases in the liquid phase so that's why we can say that the liquid phase remain unchanged.
The 2013 Rolls Royce Ghost Alpine has a top speed of 155 miles per hour. Calculate the speed in centimeters per second.
AutoChina Shanghai 2013 also plays host to the world debut of the latest Bespoke Collection from the world’s pinnacle super-luxury marque.
The Alpine Trial Centenary Collection celebrates an extraordinary moment in Rolls-Royce and automotive history. A century ago this June, four Rolls-Royce Silver Ghosts embarked on the Austrian Alpine Trials, the most arduous test of automotive endurance of the time.
In performing without fault over 1820 gruelling miles of near impassable mountain terrain, the Rolls-Royce works team and privateer entrant James Radley helped cement the marque’s reputation for peerless reliability and mechanical excellence, a reputation the company proudly retains today. In doing so establishing the legend of Rolls-Royce as maker of the ‘Best Car in the World’.
This limited edition of Rolls-Royce Ghosts feature exquisitely crafted design cues that pay tribute to these extraordinary motor cars. The exterior paint hue, for example takes close inspiration from Radley’s Silver Ghost, a car that stands side-by-side with the 2013 model in Shanghai.
Mark as brainlist
For keyboard navigation, use the up/down arrow keys to select an answer. a) Because the positive charge is on primary and secondary allylic carbocations etc. b) Because the positive charge is on a primary and a tertiary carbon c) Because the positive charge is on a primary and a secondary carbon d) Because the positive charge is on a secondary and a tertiary carbon
Answer:
b) because the positive charge is on primary and a tertiary carbon
Explanation:
The allylic carbon atom carries positive charge when primary carbon has positive charge. It forms an ion with tertiary carbon atom to form resonance. In secondary carbocation the positive charge is on secondary carbon atom. The atom are attracted and electrons form carbon - carbon sigma.
MEDICAL FORENSICS
please help me i only get one chance to do this please
Answer:
i think the answer is b temperature
Answer:
no
Explanation:
A boy sets up a picnic on the beach next to a sand dune. How are sand dunes formed?
A. erosion and deposition
B. weathering and erosion
C. tectonic plates
D. precipitation
Answer:
B. Weathering and Erosion
Explanation:
I majored in Chemistry
Answer:
b
Explanation:
Name of process happening in this picture please
Answer:
Photosynthesis
Explanation:
The plant is turning the sun, soil, and air into sugar to feed itself
Answer:
photosynthesis
Explanation:
Trial 12 1.Volume of Acid used ( mL) 2020 2.Molarity of acid used (M) 0.0160.016 3.Initial volume reading of base buret 018.6 4.Final volume reading of base used 18.636.9 5.Volume of base used (4-3, mL) _________ _________ 6.Molarity of base (1*2/5, M) _________ _________ 7.Average molarity of base _________
Answer:
[tex]V_B = 18.3mL[/tex] -- Volume of base used
[tex]M_B = 0.0175M[/tex] --- Molarity of base
Explanation:
Given
[tex]V_A = 20mL[/tex] -- Volume of acid used
[tex]V_B_1 = 18.6mL[/tex] --- Buret Initial reading
[tex]V_B_2 = 36.9mL[/tex] --- Buret Final reading
[tex]M_A = 0.016M[/tex] --- Molarity of the acid
Solving (a): Volume of base used (VB)
This is calculated by subtracting the initial reading from the final reading of the base buret.
i.e.
[tex]V_B = V_B_2 - V_B_1[/tex]
[tex]V_B = 36.9mL - 18.6mL[/tex]
[tex]V_B = 18.3mL[/tex]
Solving (b): Molarity base (MB)
This is calculated using:
[tex]M_A * V_A = M_B * V_B[/tex]
Make MB the subject
[tex]M_B = \frac{M_A * V_A }{V_B}[/tex]
This gives:
[tex]M_B = \frac{0.016M *20mL}{18.3mL}[/tex]
[tex]M_B = \frac{0.016M *20}{18.3}[/tex]
[tex]M_B = \frac{0.32M}{18.3}[/tex]
[tex]M_B = 0.0175M[/tex]
Solving (c): There is no such thing as average molarity
In genetic engineering
Answer:
what is the question?
Explanation:
Answer:
A
Explanation:
i just did the question :)
suppose you start out with only reactants in a rigid container. if the initial concentration of SO2Cl2(g) is 0.543 M, and 43.6% of this initial concentration remains when the system has reached equilibrium, what are the equilibrium concentrations of each gas in the system
Answer:
Explanation:
From the information given:
The Chemical equation is:
[tex]SO_2Cl_{2(g)} \iff SO_{2(g)} + Cl_{2(g)}\\[/tex]
since 43.6% of the initial concentration remains at equilibrium
Then; the amount of [tex]SO_2Cl_2[/tex] that is being reacted is:
= 0.543 × (100 -43.6)%
= 0.306 M
The ICE table can be computed as follows:
[tex]SO_2Cl_2[/tex] ⇔ [tex]SO_{2(g)[/tex] + [tex]Cl_{2(g)[/tex]
I 0.543 0 0
C 0.306 +0.306 0.306
E 0.237 0.306 0.306
[tex]K_c = \dfrac{[SO_2] [Cl_{2}]}{[SO_2Cl_2]}[/tex]
[tex]K_c = \dfrac{0.306 \times 0.306}{0.237}[/tex]
[tex]K_c = 0.995[/tex]
Thus; the concentration at equilibrium for the species are:
[tex]SO_2Cl_2[/tex] = 0.237 M
[tex]SO_{(2g)[/tex] = 0.306 M
[tex]Cl_{2(g)[/tex] = 0.306 M
What happens if excess carbon dioxide is not removed from the atmosphere?
A) a decrease in the amount of fossil fuels availabe
B) it may lead to global warming
C) more dead plants and animals not decomposing before getting buried
D) increase in the amount of fossils fuels available
please help fast I need to bring my grade up I'll give 30 points.
Answer:
Carbon dioxide becomes a poisonous gas when there is too much of it in the air you breathe. Besides the effects it can have on the planet and the atmosphere, carbon dioxide poisoning can lead to central nervous system damage and respiratory deterioration in humans and other breathing creatures.
Answer:
Carbon dioxide becomes a poisonous gas when there is too much of it in the air you breathe. Besides the effects it can have on the planet and the atmosphere, carbon dioxide poisoning can lead to central nervous system damage and respiratory deterioration in humans and other breathing creatures.
Explanation:
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