Answer:
true
Explanation:
Temperature is a measure of the average kinetic energy of the molecules, so energy would naturally be transferred from the molecules with more kinetic energy to the molecules with less kinetic energy
Predict which one of the following salts is used for softening water?
A) [tex] Na_{2} SO_{4}[/tex]
B) [tex] Na_{2} Si O_{3}[/tex]
C) [tex] Na_{2} CO_{3}[/tex] x [tex] 10 H_{2}O[/tex]
D) [tex] NaClO_{3} [/tex]
Salts such as [tex] Na_{2} SO_{4}[/tex] are used in softening of hard water.
What is hardness of water?Hardness of water is the presence on water of dissolved metallic ions such as calcium and magnesium ions results in the water having additional properties such as taste.
Hardness of water is of significance in the laundry industry as it causes water to lather with difficulty and also produces sc_um.
To remove hardness of water or to soften water, salts such as [tex] Na_{2} SO_{4}[/tex] are used.
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What is the main chemical component present in striking surface of a matchbox?
A. Potassium chlorate
B. Phosphorus
C. Potassium
D. Graphite
Answer:
Phosphorus
Explanation:
Actually that's red Phosphorus
The matchstick contains potassium chlorate at topOn reaction between these when we slides them white Phosphorus is formed which burns the match sticksAnswer:
Option B. ( Phosphorus)
Explanation:
Here, we want to select the option which is the main component present in the striking surface of a matchbox
The correct choice here is phosphorus
Red phosphorus which is an allotrope of phosphorus finds use in this particular case. It is the main chemical component present in the striking surface of a matchbox.
Hope this helps!
If you have any queries please ask.
For the molecule allene, h2 c = c = ch2, give the hybridization of each carbon atom. Will the hydrogen atoms be in the same plane or perpendicular planes?
Owing to the fact that allene is not a planar molecule, the hydrogen atoms in the molecule do not lie on the same plane.
What is a plannar molecule?A planar molecule refers to those molecules that lie on same plane. This means that the atoms in the molecules are all arranged along the same plane.
Now we know that the molecule allene is not a planar molecule. Owing to the fact that allene is not a planar molecule, the hydrogen atoms in the molecule do not lie on the same plane. All the carbon atoms present are sp2 hybridized.
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why is burning not a pahse change
Answer:
This is because it is a physical change not a chemical change.
A compound has a percent composition of 38.7% carbon, 9.76% hydrogen, 51.5% oxygen.
Laboratory data shows that the compound's molar mass is 62.0 g/mol. What is the
molecular formula of the compound?
The molecular formula of the compound that has a percent composition of 38.7% carbon, 9.76% hydrogen, 51.5% oxygen is C2H6O2.
How to calculate molecular formula?The molecular formula can be calculated from the empirical formula. The empirical formula of the compound is calculated as follows:
C = 38.7% = 38.7gH = 9.76% = 9.76gO = 51.5% = 51.5gNext, we convert the mass to moles by dividing by their atomic mass:
C = 38.7 ÷ 12 = 3.23molH = 9.76 ÷ 1 = 9.76molO = 51.5÷ 16 = 3.22molNext, we divide by the smallest (3.22)
C = 1H = 3O = 1Hence, the empirical formula of the compound is CH3O
If the molar mass of the compound is 62g/mol;
(CH3O)n = 62
31n = 62
n = 2
(CH3O)2 = C2H6O2
Therefore, the molecular formula of the compound that has a percent composition of 38.7% carbon, 9.76% hydrogen, 51.5% oxygen is C2H6O2.
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Look at the products of the chemical reaction to determine if the reactant added to water caused an acid reaction, a base reaction, or a neutralization reaction.
Acid
Neutralization
Base
1.
2HF + 2CaOH -> 2H2O + 2NaF
2.
3HI + 2H2O -> 2H3O+ + 3I- + H+
3.
2CH3COO- + H2O -> CH3COO- + OH- + CH3COOH
0.05 moles of HCL are added to 2 L of H2O. What is the molarity of the solution?
Impossible to answer the question with the information provided.
1.60
0.025M
10.4
1. The reaction is a neutralization reaction
2. The reactant added to the water causes an acid reaction
3. The reactant added to the water causes a base reaction
4. The molarity of the solution is 0.025 M
What is a neutralization reaction?This is a reaction involving an acid and a base which result in the formation of salt and water only
HF + NaOH –> H₂O + NaF
The reaction above indicates neutralization since the reaction produces water (H₂O) and salt (NaF) only
What is an acid?An acid is a substance which dissolves in water to produce hydronium ion H₃O⁺
3HI + 2H₂O —> 2H₃O⁺ + 3I¯ + H⁺
The reaction above is an acid reaction since it produces H₃O⁺
What is a base?A base is a substance which dissolves in water to produce hydroxide ion OH¯
2CH₃COO¯ + H₂O —> CH₃COO¯ + OH¯ + CH₃COOH
The reaction above is a base reaction since OH¯ is produced.
How to determine the molarity Mole = 0.05 mole Volume = 2 LMolarity =?Molarity = mole / Volume
Molarity = 0.05 / 2
Molarity = 0.025 M
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What does the spheres represent?
Please help?
Answer:
the N at the top is north bottom is south w on your left is west and e of your right is east
136 grams of barium sulfate is used to make a 2.5 M solution. How many liters of water are needed?
Answer:
yay well done good job keep going
Explain in words what is happening in each chemical equation.
nh3 + o2 -> no2- + 3h+ + 2e-
no2- + h2o -> no3- + 2h+ +2e-
Answer:
Ammonia and oxygen without catalyst | NH3 + O2 → N2 + H2O. With supply of heat, ammonia reacts with oxygen and produce nitrogen gas and water as products. Nitrogen of ammonia is oxidized to nitrogen gas from -3 oxidation state to 0 oxidation state.
Explanation:
How many moles of Oxygen gas are in a container that has a total volume of 33.0L at a pressure of 96.2kPa and a temperature of 35°C.
ideal gas constant= 8.31[tex]\frac{L(kPa)}{mol(K)}[/tex]
A 33.0-L container at 96.2 kPa and 35 °C contains 1.24 moles of oxygen.
What is an ideal gas?An ideal gas is a hypothetical gas whose molecules occupy negligible space and have no interactions, and which consequently obeys the gas laws exactly.
First, we will convert 35°C to Kelvin using the following expression.
K = °C + 273.15 = 35 + 273.15 = 308 K
We want to calculate the number of moles of oxygen in a 33.0-L container at 96.2 kPa and 308 K. We will use the ideal gas equation.
P × V = n × R × T
n = P × V / R × T
n = 96.2 kPa × 33.0 L / (8.31 l.kPa/mol.K) × 308 K = 1.24 mol
where,
P is the pressure.V is the volume.n is the number of moles.R is the ideal gas constant.T is the absolute temperature.A 33.0-L container at 96.2 kPa and 35 °C contains 1.24 moles of oxygen.
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Based on the arrows, in which direction are air masses moving? from west to east from north to south toward the equator toward the middle latitude
Air masses are large air volume at constant humidity and a temperature it moves by convection in the atmosphere. The direction is from west to east.
What are the directions?Directions are the path or the points of something or an object. The earth has four major directions one towards the upper side called north, downwards called south, towards the left known as the west, and towards the right called east.
The image shows the movements of the arrow from the left to the right side. On the left is, the west and towards the right is the east.
Therefore, option a. from west to east is the movement of the air masses.
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Why agar is used as a solidifying agent in culture media instead of gelatin
Agar is used as a solidifying agent in culture media instead of gelatin because it readily melts and it contains no nutrition for bacteria cultures.
What is agar?Agar is a gelatinous material obtained from red algae and used in the preparation of culture medium.
Agar is used to solidify the culture medium for bacteria growth, although, gelatin can also be used.
However, agar is preferred as a solidifying agent in culture media instead of gelatin because it readily melts and it contains no nutrition for bacteria cultures.
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How many molecules are in 37 grams of H2O
Answer:
2.053812097286304 mol
Use the drop-down menus to complete each statement. is used as construction materials. is important for the production of crops. is the loss of fertile soil.
Bedrock is used in the construction of structures, the topsoil is important for the production of crops and the loss of fertile soil is known as desertification.
Bedrocks, topsoil, and desertificationBedrocks are underlining rocks below soils. They are useful in construction works such as buildings, bridges, etc.Topsoils are the topmost portions of soils. They are usually rich in humus and organic matter and are therefore very good for agricultural crop production.Desertification is simply the loss of fertile soils and their transformation to barren, unproductive lands. Topsoils are lost and soils are rendered unsuitable for agriculture.More on desertification can be found here: https://brainly.com/question/24255548
Answer:
1. Bedrock
2. Topsoil
3. Desertification
Explanation:
Look at the diagram. What is substance X?
Enter your answer
What is substance x??
Molten cryolite is the substance which serves as an electrolyte in the diagram.
What is an Electrolyte?This is defined as a substance that conducts electricity when dissolved in water.
Molten cryolite serves as the electrolyte as it helps dissolve molten aluminium oxide and increases the conductivity of the solution which was why it was chosen as the most appropriate choice.
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Answer: Molten cryolite
Explanation: Molten cryolite serves as the electrolyte as it helps dissolve molten aluminium oxide and increases the conductivity of the solution which was why it was chosen as the most appropriate choice.
Which electromagnetic wave does the student replace the question mark with in the table?
A
radio waves
B
gamma rays
C
infrared waves
D
visible light waves
Answer:
B) Gamma
Explanation:
Gamma is by far the most powerful, and only one that can produce this much energy
option c is your answer.
Besides chlorine what are the chemical sanitizers approved for operations.
Iodine and quaternary ammonium are chemical sanitizers approved for operations.
What is a Sanitizer?These are chemicals which help to remove pathogens from the surface of materials.
Iodine and quaternary ammonium are able to do that in a safe manner. This is therefore the reason why both of them were approved as sanitizers and chosen as the most appropriate options.
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When the following redox equation is balanced with smallest whole number coefficients, the coefficient for nitrogen dioxide will be _____. I2(s) hno3(aq) ⟶ hio3(aq) no2(g) h2o(l)
In a redox reaction, electron could be lost or gained. The coefficients in the balanced redox reaction are; 1/2, 5, 1, 5, 2, 1.
What is a redox reaction equation?A redox reaction equation shows the species that were oxidized or reduced in a redox reaction. In this case, we are asked for the coefficients in a balanced redox reaction equation.
We must recall that five electrons were lost/gained in the process hence the balanced reaction equation is;
1/2I2 + 5HNO3 -----> IO3^- + 5NO2 + 2H2O + H^+
The coefficients in the balanced equation therefore are; 1/2, 5, 1, 5, 2, 1.
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The following redox equation is balanced with the smallest whole number coefficients, the coefficient for nitrogen dioxide will be 10.
What are redox reactions?
In redox reaction, there is transfer of electrons between the species of the reactions.
The given redox reaction is
[tex]\rm I2 (s) + HNO_3 (aq) -- > HIO_3 (aq) + NO_2 (g) + H_2O[/tex]
To find coefficient of the compounds of the reaction, there are coefficient calculator present.
Thus, the coefficient for nitrogen dioxide will be 10.
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What three things does force cause?
Forces can cause objects to accelerate , decelerate , stop , start moving , change direction , change shape , or even turn
What is the only non-metal that is not on the upper right side of the periodic table?
Answer:
Hydrogen
Explanation:
Hydrogen number one on the periodic table is on the left side and is a non metal gas.Hydrogen is on the left side because like members of the IA group containing Lithium, Sodium and Potassium it has a normal charge of +1.
Answer:
I believe it is Hydrogen
Explanation:
If you hadn't added quite enough hydrochloric acid to consume all the magnesium metal, what would be the effect of this error on the percent yield in your experiment? Would the actual yield ( and thus the percent yield) be erroneously high, low, or be unaffected by not adding enough HCl? Explain
If enough HCl is not added, the percent yield will be lower as all the magnesium metal has not reacted with HCl.
What is percent yield of a reaction?The percent yield of a reaction is the ratio of the actual yield and the expected yield expressed as a percentage.
Percent yield = actual yield/expected yield × 100%The reaction between magnesium metal and HCl liberates hydrogen gas and forms magnesium chloride salt.
If enough HCl was not added to react with all the magnesium metal, the actual yield will be lower.
Hence, percent yield will be lower as well.
Therefore, the percent yield will be lower if all the magnesium metal has not reacted with HCl.
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The ksp for silver sulfate (ag2so4) is 1. 2 ✕ 10-5. Calculate the solubility of silver sulfate in each of the following
For ksp of silver sulfate (ag2so4) at 1. 2 ✕ 10-5, the solubility of silver sulfate is mathematically given as
x = 5.26*10^{-4}
What is the solubility of silver sulfate in 0.15 M AgNO3?Generally, the equation for the Chemical reaction is mathematically given as
Ag2SO4 ⇄ 2Ag+ + SO4 2-
Therefore
Ksp = [Ag+ ]2 *[SO4 2-]
1.2*10-5 = ( 0.15 +2x)2*(x)
x = 5.26*10^{-4}
In conclusion, the solubility of silver sulfate is
x = 5.26*10^{-4}
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If the ksp of silver sulfate (ag2so4) at 1.2 × 10⁻⁵, the solubility of silver sulfate is 5.26 × 10⁽⁻⁴⁾.
What is the ksp value?ksp value determines the equilibrium between the solids and its respective ions in a solution.
The reaction is [tex]\rm Ag_2SO_4 \leftrightharpoons 2Ag+ + SO_4^2-[/tex]
The ksp pf silver sulfate is 1.2 × 10⁻⁵
Tho calculate the solubility?
Putting the values in the equation
[tex]\rm Ksp = [Ag^+ ]^2 \times [SO_4^ 2^-]\\\\1.2\times 10^-^5 = ( 0.15 +2x)2\times (x)\\x = 5.26\times 10^{-4}[/tex]
Thus, the solubility of silver sulfate is 5.26 × 10⁽⁻⁴⁾.
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) Which direction does thermal energy flow in the following diagram? *
2 points
Heat flows from the ice cream to the hand.
Heat flows from the hand to the ice cream.
The system is too cold for heat to move.
Answer:
the heat flows from the hand to the ice cream
Explanation:
we produce body heat therefore it moves to the ice cream also there is no possible way the heat could move from the ice cream because the ice cream is cold
Heat flows from the hand to the ice cream. Therefore, the correct option is option B among all the given options.
What is thermal energy?When the temperature rises, a type of energy called thermal energy is produced. The amount of thermal energy usually directly inversely proportional to the object's change in temperature. Thermal energy takes the form of heat. The thermal energy of a substance increases with temperature.
The quicker movements of the substance's atoms and molecules are what cause thermal energy to rise as temperature rises. In some cases, a substance's molecules will separate from one another and leave because the temperature has such high. Unexpectedly, thermal energy also affects the states of matter. Heat flows from the hand to the ice cream.
Therefore, the correct option is option B.
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The single most important factor influencing potassium ion secretion is ________
The single most important factor influencing potassium ion secretion is its concentration in blood plasma.
What is Plasma?
This is the liquid portion of the blood and serves as the transport medium for nutrients in the body.
When there is a high concentration in the plasma, it maximizes the concentration gradient which favors its secretion into the urinary fluid.
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The single most important factor influencing potassium ion secretion is concentration.
What is Plasma?This is the liquid part of the blood present in the body and it transports nutrients throughout the body.
Whenever in the body there is high concentration of potassium ion as a result of which concentration gradient increases which in turn favors the secretion of potassium ion into the urinary fluid.
Hence concentration is the important factor.
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Can someone do this fill in the blanks
Answer: aragon is in group 0
2. It’s a non metal
3. Group number
Explanation:
1) What happens when the pressure above the surface of a liquid is equal to the vapor
pressure of the liquid? Explain.
2)If the pressure on the surface of water in the liquid state is 30 kPa, the water will
boil at what temperature?
3) What is the vapor pressure of ethanol at its normal boiling point?
4) As the pressure on a liquid is changed from 100. kPa to 120.0 kPa, what happens to the
boiling point? Explain your answer.
5). Which substance has the lowest vapor pressure at 75°C?
(1) water (3) ethanoic acid
(2) propanone (4) ethanol 5 _____
6). According to Reference Table H, what is the vapor pressure of propanone at 45°C?
(1) 22 kPa (3) 70. kPa
(2) 33 kPa (4) 98 kPa 6 _____
7). The boiling point of a liquid is the temperature at which the vapor pressure of the liquid is equal to the pressure on the surface of the liquid. What is the boiling point of propanone if the pressure on its surface is 48 kilopascals?
(1) 25°C (3) 35°C
(2) 30.°C (4) 40.°C 7 ________
8) A liquid boils when the vapor pressure of the liquid equals the atmospheric pressure on the surface of the liquid. Using Reference Table H, determine the boiling point of water when the atmospheric pressure is 90. kPa. _____________
Table F: Solubility Guidelines
1. Based on the Solubility Guidelines chemistry reference table, a saturated solution of
Which salt would be most concentrated?
A) ZnCl2 B) AgCl C)BaSO4 D) PbCrO4
Explain your answer.
________________________________________________________________________
2. Based on the Solubility Guidelines chemistry reference table, which saturated solution
would be the least concentrated?
A) barium sulfate B) sodium sulfate C) potassium sulfate D) lithium sulfate
Explain your answer.
________________________________________________________________________
3. Solutions of AgNO3 (aq) and KCl (aq) are mixed. Will a visible reaction occur? Fill in
the missing parts to the reaction and explain your answer.
AgNO3(aq) + KCl(aq) ___________ + ____________
________________________________________________________________________
4. Which solution will undergo a double replacement reaction with Na2CO3 (aq) to produce
a white solid substance?
A) CaCl2 (aq) B) LiCl (aq) C) KCl (aq) D) NH4Cl (aq)
5. In the laboratory, a student mixes aqueous solutions of NiSO4 and NaOH. What will be
the result of this experiment?
________________________________________________________________________
When the atmospheric pressure is equal to the vapor pressure of the liquid, boiling of liquid will begin.
What happens when atmospheric pressure is equal to the vapor pressure of liquid?When the atmospheric pressure is equal to the vapor pressure of the liquid, boiling will begin. The bubbles formation started to the liquid molecules which have gained enough energy to change to the gaseous phase.
The vapor pressure of ethanol is 5.95 kPa at 20.0 °C, and its vapor pressure is 53.3 kPa at 63.5 °C.
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how much electrical energy (in kilowatt-hours) would a 60.0W light bulb use in 60.0 days ifvleft steadily
Answer:
60w x 24 = 1440wh per day
1440 x 60 = 86400 WATTS HOUR FOR 60 DAYS
Explanation:
In short.
86400/1000 = 86.4kwh
brainiest me :> THANK YOU!
Answer:
86.4kwh
Explanation:
A box is pushed across the floor for a distance of 5 metters with a force of 50N in 5 seconds. a. how much work is done? b. what is the power. also what formulas are used.
Answer:
50W
Explanation:
The formula and is
W = F × s
(force x distance)
W= 50 N× 5 m =250 N m=250 J
Done in 5 seconds the power is
p
=
W
t
where
t
=time
p
=
250
J
5
=
50 J
/s
=50 W
Answer:
Maybe 250 newtons
Explanation:
Low frequency waves have longer wavelength true or false
Answer:
True
Explanation:
Since the waves have low frequency that means the wavelength is going to be longer. Hope this helps
How many molecules make up 32 g of Oz?
Answer:
Chemical formula of Oxygen is O2.
We know ,
1 mole of a substance contains 6.022×10^23, Avogadro’s Constat.
Here, Molar mass of O = 16u
And molar mass of O2 = 32u
And 32g of O2 = 1 mole of O2
It means that,
32g of O2 = 6.022×10^23 molecules
Answer:
The correct answer is given in the picture
This ANSWER IS ONLY CORRECT WHEN Oz STAND FOR OZONE