The dissolution of borax in water is a temperature dependent reaction. With the higher temperature, the salt dissolve quickly.
What is borax?
Borax is the hydrate salt of boric acid. It is white and widely used in cleaning and in laundry detergent.
Borax is a salt that will dissolve in water at almost any temperature, with the exception of steam and ice.
However, as with any salt, the higher the temperature, the faster the salt dissolves, so speed is dependent on temperature. It will dissolve in cold water, but it will take longer.
Thus, the dissolution of borax in water is a temperature dependent reaction.
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Which of the following is an example of a chemical change?
a rock being crushed into pieces by a hammer
a rock becoming smaller over time due to wind
a rock's appearance changing over time due to exposure to acid rain
all of the above
Answer:
a rock's appearance changing over time due to exposure to acid rain
♡ The Question/Task(s)! ♡
✦ || Which of the following is an example of a chemical change?
︶꒦︶꒷︶︶ʚ♡ɞ︶︶꒷︶꒦︶
♡ The Answer(s)! ♡
✦ || The answer is, "A rocks appearance changing over time due to exposure to acid rain"!
I apologize in advance if the answer is incorrect! ♡
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♡ The Explanation(s)/Step-By-Step! ♡
✦ || The acid rain is caused by chemical reactions from sulfur dioxide, nitrogen oxides, and other chemicals that combine with the atmosphere's oxygen and water causing the chemical change!
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♡ Tip(s)! ♡
✦ || No Tips Provided!ヽ(>∀<☆)ノ
Which halogen has the highest boiling point.
a.) f2
b.) cl2
c.)br2
d.) i2
Answer:
D
Explanation:
Recall that boiling points increase with stronger intermolecular forces.
Because halogens are diatomic molecules, they are nonpolar and lack the ability to form hydrogen bonds. Therefore, the only IMF they possess are London dispersion forces.
Recall that London dispersion forces increase with increasing polarizability, which is higher in larger molecules due to the increased number of electrons.
The largest halogen is iodine (I₂). Therefore, it will have the strongest IMF and hence the highest boiling point.
Which diagram shows the correct electron configuration for nitrogen (N)?
A group of five short lines. The first line has an up and a down arrow above it and is labeled 1 s below. The second line has an up and a down arrow and is labeled 2 s. The third arrow has an up and a down arrow; the fourth has an up arrow only, and the third has no arrows. The third, fourth, and fifth lines are bracketed with the label 2 p.
A group of five short lines. The first line has an up and a down arrow above it and is labeled 1 s below. The second line has an up and a down arrow and is labeled 2 s. The third, fourth, and fifth lines each have an up arrow and are bracketed with the label 2 p.
A group of five short lines. The first line has an up and a down arrow above it and is labeled 1 s below. The second line has an up and a down arrow and is labeled 2 s. The third and fourth lines each have an up arrow; the fifth line has a down arrow. The third, fourth, and fifth lines are bracketed with the label 2 p.
Answer:
the second one is the correct answer
Answer:
its b
Explanation:
a 2.00l flask was filled with 4.00 mol of hi at a certain temperature and given sufficient time to react. at equilibrium the concentration of h2 was 0.400 m. find the equilibrium concentrations of i2 and hi and then find the keq at this temperature. 2hi(g) <==> h2(g) + i2(g)
From the calculations and data, the equilibrium constant is 16.
What is equilibrium?The term equilibrium refers to the state in which the rate of forward reaction and the rate of reverse reaction becomes equal.
Setting up the ICE table
Concentration of HI = 4.00 mol /2.00l = 2 M
Concentration of H2 and I2 = 0.4 M
Hence;
2HI <==> H2(g) + I2(g)
I 2 0 0
C -x +x +x
E 2 - x 0.4 0.4
Hence x = 0.4
[HI]eq =
2 - 0.4 = 1.6
Keq = (1.6)^2/(0.4)^2 = 2.56/0.16 = 16
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1. Write the balanced equation for the decomposition of hydrogen peroxide
The balanced equation for the decomposition of hydrogen peroxide is H₂O₂(aq)→2H₂O(l)+O₂(g).
What is decomposition reaction?Decomposition reactions are those reactions in which a compound will decompose into small molecules.
Hydrogen peroxide will decompose into water molecule and oxygen gas, balanced chemical equation will be represented as:
H₂O₂(aq) → 2H₂O(l) + O₂(g)
Where all atoms are present in equal quantities on both side of the equation.
Hence balanced decomposition reaction of H₂O₂ is H₂O₂(aq)→2H₂O(l)+O₂(g).
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The unit for molar mass is
HELP ASAP!
A student builds an electric motor with 6 loops in the coil of wire and applies a voltage of 1.5 volts. Make a prediction about how fast the motor would spin compared to the ones you observed in your experiment. Support your prediction with evidence. Explain your prediction using cause-and-effect relationships.
If the given emf (1.5 volts) is greater than the emf you observed in your experiment, then the motor with 1.5 volts will move faster.
Speed of the motorThe speed of the motor depends on the strength of the induced emf in the coil of the electric motor.
emf = NdФ/dt
where;
N is number of loopsdФ is change in magnetic fluxF = BIL = qvB
where;
I is the induced currentAs the induced current in the coil of the motor increases, the speed of the motor will increase.
Thus, if the given emf (1.5 volts) is greater than the emf you observed in your experiment, then the motor with 1.5 volts will move faster.
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Answer:
The motor will spin slower
Explanation:
The other three motors have either 9, 12, or 15 loops of wire. The more loops, the faster it goes.
Science edpuzzle
All of the following describe a chemical change, EXCEPT…
Answer:
B
Explanation:
You might want to pick "A sound is created" No that answer is just fine. If you listen when sitting around a campfire, you might hear the crackling of what is burning. Burning is an excellent example of a chemical change. Wood becomes ash.
The answer is a change in the state of matter. (B). That need not indicate a chemical change. In fact, most of the time, a change in matter is a physical change.
Answer: B
Place the followinf substances in order of increasing vapor pressure nf3 nh3 bcl3
The substances in order of increasing vapor pressure NF₃ NH₃ BCl₃ is NH₃< NF₃ < BCl₃. The correct option is A.
What is vapor pressure?The pressure is exerted by a vapor in thermodynamic equilibrium with the developing close (solid or liquid) in a closed system at a given temperature is referred to as vapor pressure (or equilibrium vapor pressure).
Vapor pressure can be calculated by Clausius-Clapeyron equation.
Thus, the correct option is A, NH₃< NF₃ < BCl₃.
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Predict the vapor pressure of a solution of 261 ml of glycerol, in 379 ml of water, at the normal boiling point of water
The vapour pressure of the solution of glycerol is 106.4 torr.
What is vapour pressure?The vapour pressure is given as the pressure extered by the individual sample in a solution. According to Roult’s law, the vapour pressure of mixture is given as:
[tex]\rm Vapor\;pressure\;of\;solution=moles\;of\;solute\;\times\;vapour\;pressure\;of\;pure\;solvent[/tex]
The density of glycerol is 1.25 g/mL. The mass of glycerol in 261 mL will be:
[tex]\rm Density=\dfrac{mass}{volume}\\\\1.25\;g/mL=\dfrac{mass}{261\;mL}\\\\Mass =326.25\;g[/tex]
The moles of glycerol are given as:
[tex]\rm Moles=\dfrac{mass}{molar\;mass}\\\\Moles=\dfrac{326.25}{92.09\;g/mol}\\\\Moles=3.54\;moles[/tex]
The density of water is 1, thus the mass of 379 mL water is 379 grams. The moles of solvent are:
[tex]\rm Moles=\dfrac{379}{18\;g/mol}\\\\Moles=21.05\;moles[/tex]
The mole fraction of solute is given as:
[tex]\rm Mole \;fraction=\dfrac{moles\;of\;solute}{moles\;of\;solute\;+\;moles\;of\;solvent}\\\\Mole\;fraction=\dfrac{3.54}{3.54+21.05}\\\\Mole\;fraction=0.14[/tex]
The mole fraction of solute is 0.14. The vapour pressure of pure water at boiling point is equivalent to the atmospheric pressure i.e. 760 torr.
Substituting the values in Roult’s law, the vapour pressure of solution is given as:
[tex]\rm Vapor\;pressure=0.14\;\times\;760\;torr\\Vapor\;pressure=106.4\;torr[/tex]
The vapour pressure of the solution of glycerol is 106.4 torr.
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A metal wire has a length l and a cross-sectional area a. The resistance of the wire is directly proportional to
The resistance of the wire is directly proportional to the length of the wire, l.
What is resistance?Resistance is given as the ability of the wire to resist or stop the flow of current. The resistance of the wire can be given to have the formula:
[tex]\rm Resistance=\dfrac{length }{area}[/tex]
Thus, it can be given that the resistance of the wire is inversely proportional to the area of the cross-section and directly proportional to the length.
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Over 100 existing elements are listed and classified on the ___
Answer:
the anser is the periodic table of the elements
Explanation:
Black holes cannot be seen. However scientists think that black holes exist because of their effect on surrounding matter. Describe another force or phenomenon that cannot be seen directly. Give examples of the effects of this force on everyday objects.
BTW this is not the right subject but there is no astronomy category so I am using this subject.
Answer:
If Black Holes Are "Black," How Do Scientists Know They Are There? A black hole can not be seen because strong gravity pulls all of the light into the middle of the black hole. But scientists can see how the strong gravity affects the stars and gas around the black hole.
Explanation:
some examples; 1. Pushing a wheel barrow.
2. Opening or closing a door.
3. Squeezing wet clothes.
4. Gravitational force.
5. Brakes applied to stop a moving vehicle.
6. A football kicked harder that decreases due to the frictional force.
7. Rubbing a glass rod with a silk.
8. Pressure applied on a pin of a notice board.
9. Running
10. Pushing
Supernova or void is another force or phenomenon that cannot be seen directly similar to black holes.Examples of the effects are gravitational force, brakes applied to stop a moving vehicle.
What is force?Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
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What is the difference between clastic and chemical sedimentary rocks?
Clastic rocks are classified by grain shape, grain size, and sorting. Chemical sedimentary rocks are precipitated from water saturated with dissolved minerals. Chemical rocks are classified mainly by the composition of minerals in the rock.
hi again, hope this helps ^^
Answer: The difference is clastic rocks are classified by grain size, grain shape, and sorting. Chemical sedimentary rocks are precipitated from water saturated with dissolved minerals. They are also mainly classified by the composition of minerals that are in the rock.
Explanation:
Select the correct structure that
corresponds to the name. Please help me asap
Answer:
Option A
Explanation:
Option A
7 carbon atoms bonded with a single bondIUPAC name for 7 is "hept"⇒ heptaneOption B
CH₃ - CH₂ - CH₂ - CH₂ - CH₂ - CH₃6 carbon atoms bonded with a single bondIUPAC name for 6 is "hex"⇒ hexaneOption A is the correct answer.
The purpose of hydrogenating unsaturated fats is to.
A fishing line that snaps due to the inability to hold the weight of the fish at the other end. What kind of forces could be exerting on the fishing line and where are the sources of force coming from?
The force that causes a fishing line to snaps due to the inability to hold the weight of a fish is called the Tension Force
Meaning of Tension force and how it affects a fishing line
A tension force is a force that acts upon a surface, material and a line. It acts on a line as a result of a force that causes the line to stretch.
Tension acts on the two ends of a line, it can be said to be an action and reaction force.
Tension acting on a fishing line comes from the fisherman and the fish to be caught. The tension meets at the middle of the line and when the line is not strong enough to hold such amount of force it snaps.
In conclusion, The force that causes a fishing line to snaps due to the inability to hold the weight of a fish is called the Tension Force
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Scientific Method
Vocabulary
To notice similarities or differences
Answer:
The first step would be searching for your scientific vocabulary the second step is to write it down and then that would be your answer.
Explanation:
Hope this helps!
i need help pleaseeeeeeee
Which of the following factors will only affect the reaction rate of a solid?
OA. Concentration
B. Temperature
C. Surface area
D. Catalyst
Answer:
B. Temperature
Explanation:
The rate of a reaction is defined as the speed at which the reactants are converted into products. Factors influencing the rate of a reaction are concentration, catalyst, temperature, surface area, and pressure, etc.
In case of the reaction rate of gases, pressure will only have its affect as pressure do not have any influence on solid and liquid.
How many moles of sulfur dioxide are produced with 6.0 mols of carbon dioxide?
Answer:
228.38g of CO2
Explanation:
Which statement best describes how those advancements are detrimental to the earth?
The detriment of these advancements to the Earth is that: the growing population is taxing Earth's resources which could lead to the extinction of many species.
The effect of science and technology.Various scientific discoveries and technological advances around the world have led to an exponential increase in Earth's population with no end of the growth in sight.
In conclusion, we can infer and logically deduce that the statement which best describes how these advancements are detrimental to the Earth is that the growing population is taxing Earth's resources and this may likely lead to the extinction of many species of organisms.
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PLEASE HELP DUE IN 15!!!!!!!!!!!! WILL GIVE BRAINLIEST!!
Question 17: 2C2H6 + 7O2 ---> 4CO2 + 6H20
How many moles of O2 are needed to completely react with 4.50 moles of C2H6 according to the above equation?
a. 5.8 moles
b. 3.11 moles
c. 1.29 moles
d. 63.0 moles
Explanation:
n=,4.5 moles C2H6
the ratio 2:7
4.5:x
x=15.75 moles
If a reaction vessel initially contains an n2o4 concentration of 0. 0550 m at 500 k, what are the equilibrium concentrations of n2o4 and no2 at 500 k?
The equilibrium constant gives the relation between the product formation and the reactant used. The concentration of the dinitrogen tetroxide is 0.003 M, and nitrogen dioxide is 0.054 M.
What is the equilibrium constant?An equilibrium constant gives the conversion rate of the reactant of the chemical reaction into the products.
The reaction can be shown as,
[tex]\rm N_{2}O_{4} \rightleftharpoons 2NO_{2}\;\; \rm Kp = 4.5[/tex]
From the ICE table attached below, the concentrations are calculated as:
[tex]\begin{aligned}\rm Kp &= \rm \dfrac{[NO_{2}]^{2}}{N_{2}O{4}}\\\\4.5 &= \rm \dfrac {x^{2}}{(0.0550 - x)}\\\\\rm x^{2} &=\rm 4.5 (0.0550 - x)\end{aligned}[/tex]
Solving further,
[tex]\begin{aligned} \rm 0.2475 - 4.5 x &= \rm x^{2}\\\\\rm x^{2} + 4.5 x - 0.2475 &= 0\\\\\rm x &= 0.054\end{aligned}[/tex]
Therefore, the concentration of nitrogen dioxide is 0.054 M and dinitrogen tetroxide is 0.003 M.
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Solve to me this question
1400 J of heat energy is added to a sample of iron. The temperature of the sample
rose from 16 C to 20 C. How many moles of iron were used?
Answer: 14.24
Explanation:
What happens to the level of hydronium ions in a solution when the number of hydroxide ions decrease
When the number of hydroxide ions decrease then the level of hydronium ions in a solution increases.
What is pH?pH of solution gives idea about the acidity or basicity of the solution and pH will be represented as:
pH = -log[H⁺]
If in any solution number of hydroxide ions decreases as compared to the concentration of hydronium ions, then the concentration of hydronium ions increases as a result of which acidity of the solution also increases.
Hence, level of hydronium ions increases.
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_______, ________, and ________ are renewable resources.
biomass energy, hydropower, and wind energy
biomass energy, coal energy, and wind energy
hydropower, coal energy, and wind energy
biomass energy, hydropower, and coal energy
Answer:biomass energy, hydropower, and wind energy
Explanation:
how much water should be added to 15g of Common salt to prepare a solution of 15% concentration?
I'll mark you as brainliest if you show with steps
Explanation: To make the salt solution of 15% with 15 gm as the mass of the solute, the mass of the solvent must be 85 gm. Therefore, 85 gm of water should be added.
Explain 3 factors which you must consider in preferential discharge
Answer:
Factors that determine preferential discharge of ionsFactors Affecting the Preferential Discharge of Ions in Electrolysis
1. The position of ion in electrochemical series.2. The concentration of the ion.3. The nature of the electrode.4. Relationship between the position of ions in the electrochemical 5. Concentration of the ions in the electrolyte.
