Answer:
0.366m = Molality of the solution
Explanation:
To solve this question we must know the addition of a solute produce decreasing in freezing point regard to the pure solvent. The equation is:
ΔT = m*Kf*i
Where ΔT is change in freezing point
(As freezing point of water is 0°C, the ΔT is 2.72°C)
Kf is freezing point depression constant = 1.86°C/m for water
i is Van't Hoff factor. The number of ions produced when 1 mole of the salt is dissolved = 4 ions for Fe(ClO₃)₃, Fe³⁺ and 3 ClO₃⁻ ions
m is molality of the solution.
Replacing:
2.72°C = m*1.86°C/m*4
0.366m = Molality of the solution
Which of the following is not a type of covalent bond?
A. Polar
B. Double
C. Non-polar
D. Quadruple
Answer:
letter b
Explanation:
I dunno if I'm right cuz I'm just a grade five sorry if this can't help
in an ionic bond:
A. both atoms share their electrons.
B. one atom accepts electrons from another.
C. The atoms attract each other but their electrons do not interact.
D. The atoms swap electrons
Need help on this question asap pleasee I would really appreciate it
Answer:
See Explanation
Explanation:
An endothermic reaction is one in which energy is absorbed and the change in enthalpy for the reaction is positive.
If we look at the reaction 2HgO + 45kcal ----> 2Hg + O2; we will notice that
i) 45kcal of energy was taken in (absorbed) for the reaction to occur
ii) The value of the reaction enthalpy is positive
For these two reasons, the reaction is an endothermic reaction as written.
According to the Arrhenius theory, an acid is a substance that
Answer:
which produces hydrogen ion in water, called acid. A substance which produces hydroxide ion in water, called base. According to Bronsted-Lowry theory, an acid is proton donor and base is proton acceptor. Actually, Arrhenius theory is limited only to the aqueous solution.
Explanation:
Calculate the molarity of a solution that contains 4.7 moles in 5.2 liters.
.9 M
24.4 M
1.1 M
.5 /m
Answer:
0.9M
Explanation:
molarity = mols/L
M=4.7mol/5.2L
= 0.9M
Select the correct arrows. Which arrows indicate weathering and erosion? sedimentary rocks metamorphic rocks igneous rocks
Answer:
igneous to sedimentary rock
Explanation:
Answer:
ingeous rocks to sedimentary rocks
What actions could you take to increase the rate of solution for a solid solute that dissolves endothermically in 100g of water?
Answer:
We will increase the temperature for a solution to be dissolved more into water.
To form a solution, energy is required to break the particles. If more energy is required to break the bonds of solute and solvent than the energy is released, then its called endothermic reaction.
For an endothermic solution, we would have to provide heat / temperature (energy) so that more solute can be dissolved in water which can increase the rate of solution.
An inherited behavior or physical characteristics that helps an organism survive and reproduce Natural selection Predation Adaptation Competition
look at pic thanks :D
Answer:
it's natural selection
Explanation:
adaptation is when you adapt to some situation
What is the difference between the solid line and the dotted line?
Answer:
it is dotted
Explanation:
it takes 125.0ml of 3.5M hydrobromic acid to neutralize 75.0ml of lithium hydroxide. what is the concentration of lithium hydroxide
Answer:
5.83 M
Explanation:
3.5 M * 125.0 ml = M₂ * 75.0ml
437.5 M.ml = M₂ * 75.0 ml
M₂ = 437.5 M.ml / 75.0 ml
M₂ = 5.83 M
how many grams are in 4.28 x 10^2 atoms of Ca?
2.85 grams
4.28x10^2 atoms (40.08 grams of Ca/ 6.02x10^23)
What is the relationship between the volume of a gas and its pressure?
O inversely proportional
O Directly proportional
O No relationship
O Every gas has a different relationship with pressure
Answer:
inversely proportional
Explanation:
Some of the glucose required for cellular respiration in humans is obtained by??
Answer:
.
Explanation:
Some of the glucose required for cellular respiration in humans is obtained by external food source which are rich in carbohydrates.
What is cellular respiration?Cellular respiration is the process in which cells combines the oxygen with the foodstuff molecules, and converting the chemical energy into life sustaining activities as energy.
In the human body, we get the glucose for the cellular respiration from the external food source which are riched in carbohydrates, starch, etc. After converting the chemical energy to glucose then oxygen is absorbed in the lungs and circulate the blood through out the body by red blood cells.
Hence, we get glucose from food source.
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how many total atoms are there is a sugar molecule
Answer:
The white stuff we know as sugar is sucrose, a molecule composed of 12 atoms of carbon, 22 atoms of hydrogen, and 11 atoms of oxygen (C12H22O11). Like all compounds made from these three elements, sugar is a carbohydrate
Jane made this picture to represent a chemical reaction
Which of the following statements best explains the type of chemical reaction represented by Jane's picture?
It represents a synthesis reaction because one combined reactant forms multiple products
Olt represents a synthesis reaction because the same atoms are present in the reactants and products
It represents a decomposition reaction because one reactant breaks apart and forms two products
It represents a decomposition reaction because the total mass of the products is less than the mass of the reactant.
Answer:
It represents a decomposition reaction because one reactant breaks apart and forms two products
Explanation:
Your welcome
To solve such this we must know the concept of redox reaction. Therefore, the correct option is option C. It represents a decomposition reaction because one reactant breaks apart and forms two products.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Decomposition reaction is a chemical reaction where one reactant breaks down into two or more than two products on supplying energy in form of heat or electricity.
Therefore, the correct option is option C. It represents a decomposition reaction because one reactant breaks apart and forms two products.
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List three differences between the earth 240 million years ago and the present earth.
How many molecules are there in 0.655 moles of C6H14
Answer:
[tex]\boxed {\boxed {\sf 3.94 *10^{23} \ molecules \ C_6 H_ {14} }}}[/tex]
Explanation:
1 mole of any substance has the same number of particles: 6.022 * 10²³. This number is as Avogadro's Number.
The particles can be molecules, atoms, formula units, etc. For this problem, the particles are molecules of C₆H₁₄ or hexane.
We can set up a ratio using Avogadro's Number.
[tex]\frac {6.022 *10^{23} \ molecules \ C_6H_{14}}{1 \ mol \ C_6H_{14}}[/tex]
Multiply by the given number of moles: 0.655
[tex]0.655 \ mol \ C_6H_{14} * \frac {6.022 *10^{23} \ molecules \ C_6H_{14}}{1 \ mol \ C_6H_{14}}[/tex]
The moles of hexane will cancel, because one is the "numerator" (techincally 0.655 is over 1) and the other is in the denominator of the ratio.
[tex]0.655 * \frac {6.022 *10^{23} \ molecules \ C_6H_{14}}{1 }[/tex]
[tex]0.655 * {6.022 *10^{23} \ molecules \ C_6H_{14}}[/tex]
[tex]3.94441*10^{23} \ molecules C_6H_{14}[/tex]
The original value of moles has three significant figures, so our answer must have the same. For the number we found, that is the hundredth place.
3.94441The 4 in the thousandth place tells us to leave the 4 in the hundredth place.
[tex]3.94 *10^{23} \ molecules \ C_6H_{14}[/tex]
0.655 moles of hexane is equal to approximately 3.94 *10²³ molecules of hexane.
How much energy is required to bring a 30 gram crayon from room temperature, 25 degrees C, to its melting point 49 degrees C?
Answer:
1540.8 Joules of energy is required to bring a 30 gram crayon from room temperature, 25 degrees C, to its melting point 49 degrees C
Explanation:
Crayon is paraffin wax. The specific heat of paraffin wax is 2.14 J/g°C
As we know
[tex]Q = m*c *\Delta T[/tex]
Where
[tex]\Delta T[/tex] is the change in temperature [tex]T_2- T_1[/tex]
m is the mass of the object
c is the specific heat in J/g°C
Substituting the given values, we get -
[tex]Q = 30 * 2.14 *(49-25)\\Q = 1540.8[/tex] Joules
1540.8 Joules of energy is required to bring a 30 gram crayon from room temperature, 25 degrees C, to its melting point 49 degrees C
Draw or sketch something that you might see move. Write a caption that answers the following questions: How would you describe its motion? Is it moving at a constant speed, or does it speed up and slow down?
Answer:
lets say your doing a frog
it jumps it speeds up and then slows down
Explanation:
Hardness, high melting point, brittleness, non-conductivity, unsolubility in water,.....Are characteristics of ......?
Answer:
Covalent Network Solids
Explanation:
A covalent network solid or network solid is defined as the chemical compound in which the atoms are joined by a covalent bond in continuous network and it extends all through the material. There are no single molecules on a network solid, the whole crystal may be considered as a macromolecule.
Some of the characteristics of the covalent network solids are :
It is very hard.It is non conductive.It is highly brittle.It has high melting point.It is insoluble in water.How many grams of NaOH are needed to make 2.00 L of a 0.200 M solution?
Answer: 16.0 g
Explanation: M(NaOH) = 39.998 g/mol. N = m/M = cV
Mass m = McV = 39.998 g/mol·0.200 mol/l · 2.0 l = 16.0 g
A gas initial volume and pressure is 5m^3 and 101320 Pa and allows to expand up to 12m^3 then what is the final pressure?
Answer:
New pressure = 42216.66 Pa
Explanation:
Given that,
Initial volume, V₁ = 5 m³
Final pressure, P₁ = 101320 Pa
Final volume, V₂ = 12 m³
We need to find the final pressure of the gas. We know that the relation between pressure and volume is given by :
[tex]P\propto \dfrac{1}{V}\\\\P_1V_1=P_2V_2\\\\P_2=\dfrac{P_1V_1}{V_2}\\\\P_2=\dfrac{101320 \times 5}{12}\\\\P_2=42216.67\ Pa[/tex]
So, the new pressure is equal to 42216.66 Pa.
what is amphotheric oxide give me an two instance
Answer:
Amphoteric oxide is an oxide that reacts with both acids and bases. In other words, it possesses both acidic and basic properties. For example both zinc and aluminium are metals but their oxides, ZnO and Al2O3 are amphoteric oxides as they react with both acids and bases.
Explanation:
Which activity is the best demonstration of J.J. Thomson’s use of creativity in his work?
Answer:
The correct answer is making observations in his experiment. In his cathode ray tube experiment J. J. Thomson proved that the cathode rays are indeed negatively charged particles.
formula of atom bomb
Answer:
It says that the energy (E) in a system (an atom, a person, the solar system) is equal to its total mass (m) multiplied by the square of the speed of light (c, equal to 186,000 miles per second).
Explanation:
Please help me with this one. I think it’s right but can someone double check it.
Which statement describes the focus of an earthquake?
It creates stress in rock.
It develops in the lithosphere.
It lies above the surface where rock breaks.
It begins about 5 kilometers below Earth’s surface.
Answer:Its B the person above me is correct go thank and rate 5 there answer!
Explanation:
Hope it helps!
One of the most common natural disasters is an earthquake. It results in significant loss of lives and property worldwide each year. The time has come for effective tactics and catastrophe management awareness. It develops in the lithosphere. The correct option is B.
What is earthquake?An earthquake is the sudden release of energy from the earth's crust that causes the earth's surface to shake. Seismic waves, also called S waves, are consequently produced. The type and severity of an earthquake are based on the local seismic activity.
Sudden tectonic changes in the earth's crust are what generate earthquakes. Orogeny, which causes earthquakes and volcanoes, is caused when the tectonic plates glide over one another. Vibrations produced by these disturbances travel in all directions.
All the geological events like earthquakes, volcanoes, etc. mainly occurs in the Lithosphere.
Thus the correct option is B.
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How does circulation help maintain body temperature?
Answer:
Answer Below
Explanation:
Your feet and hands are thin compared to the rest of your body. Thin stuff has a large surface area compared to volume. Surface area is where you lose heat and volume is where you generate heat. Because of this, they lose heat quickly and do not generate enough heat to stay warm. To fix this your body also moves heat around from your warm core to your hands and feet using your blood. Your blood is warm. It gets to be that way because it runs through areas, mostly in your torso, that are always warm
PLEASE HELP ASAP
Volcanoes erupt as a result of
A) Two continental plates converging
B) One oceanic plate converging with one continental plate
C) Two tectonic plates transforming
Answer:
B.) One oceanic plate converging with one continental plate.
HOPE THIS HELPS!
Answer:
C: Two tectonic plates transforming
1. Scientists create both scientific theories and scientific laws as they make observations and conduct experiments about the natural world. Which of the following statements most accurately compares the difference between scientific theories and scientific laws?
a) Scientific laws are based on evidence, while scientific theories are not.
b) Scientific theories involve only biology, while laws involve all types of science.
c) Scientific theories involve mathematical equations, while scientific laws are based on observations.
d) Scientific theories are ideas that explain natural events, while scientific laws more reliably predict natural events
Answer:
D
Explanation:
While scientific laws more accurately forecast natural events, scientific theories are beliefs that explain natural happenings. So, the correct option is D.
What is the difference between scientific laws and scientific theories?Scientific laws are explanations for why certain occurrences occur or explanations of the phenomenon occurring itself. The outcomes or the causes of such phenomena are not explained. By stating a link verbally or mathematically, it only clarifies the situation and makes the underlying "science" simpler to comprehend.
On the other hand, scientific theories are those that make an effort to define or clarify why a phenomenon occurs. Its foundation is observation. Before drawing a conclusion, there is still a process of learning or discovery. It is a conceptual framework for explaining and projecting new information.
Thus, the correct option is D.
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