The ph at the equivalence point in weak acid-strong base titration is.
Please help with this question. At first i chose the second answer but it’s wrong.
Answer:
D
Explanation: gas particles are attracted to one another is NOT an assumption we make for ideal gasses
Calculate and compare the molar solubility of Mg(OH)2 in water and in a solution buffered at a pH of 4. 5. Required:
Determine the molar solubility of Mg(OH)2 in water and the pH of a saturated Mg(OH)2 solution
Since Mg(OH)2 is a base, the molar solubility of Mg(OH)2 in water is less than in a solution buffered at a pH of 4.5
What is molar solubility of a solute?The molar solubility of a solute is the amount in moles if a solute that dissolves in a given volume of solvent.
Molar solubility = moles of solute/volume of solvent.Mg(OH)2 is a base which is partially soluble in water.
Molar mass of Mg(OH)2 is 58 g/mol
Moles of Mg(OH)2 can be calculated using the formula: moles = mass/molar mass
The pH of a solution of Mg(OH)2 will be greater than 7.
In a solution buffered at a pH of 4.5, the molar solubility of Mg(OH)2 will be greater than in water since more of the base can dissolve in acidic buffer solution.
Therefore, the molar solubility of Mg(OH)2 in water is less than in a solution buffered at a pH of 4.5
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Question 1 of 10
What is a flame test used for?
Answer:
B
Explanation:
A flame test is used to identify an unknown sample by its emission spectrum. The correct answer is option B.
Flame tests are used to identify the presence of certain metal ions in a sample based on the color of the flame that is produced when the sample is heated.
When a metal ion is heated in a flame, it absorbs energy from the flame and becomes excited. As the metal ion returns to its ground state, it releases energy in the form of light, which causes the flame to emit a characteristic color.
The color of the flame is specific to the metal ion that is present and can be used to identify the metal ion based on a color chart.
Therefore option B. "to identify an unknown sample by its emission spectrum" is the correct answer.
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What can be used to determine the age of a victim between age 15 and 22 from dental remains?
Answer:
When determining the age of a victim withing ages 15-22, dental remains provide comparison of the stage of tooth formation shown in X-rays and bone.
A student writes the following explanation of how one type of compound is formed. these compounds are made by the repeated joining of one smaller unit to the end of a growing chain. the units are generally alkenes, which retain all their atoms in the chain. a compound which undergoes a similar process is polyethylene. which process is being described? condensation polymerization addition polymerization dehydrohalogenation dehydrogenation
In the given question according to the information the process of polymerization is an addition polymerization.
What is polymerization?Polymerization is a process in which addition of many small molecules takes place for the formation of a large three dimensional substance known as polymer.
In the polymerization of polyethene the small repeating molecule is ethene and in this process product formed due to the addition process to the double bond of the ethene.
In condensation polymerisation removal of water molecule or any other molecule takes place.In dehydrogenation polymerisation removal of hydrogen molecule takes place.In dehydrohalogenation polymerisation removal of hydrogen halide molecule takes place.Hence given process is an addition polymerisation.
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Answer:
The answer is B. addition polymerization
Explanation:
What concentration of OH is required to created a pOH of 1.3.
Answer:
0.0501
Explanation:
OH=10^-poH
OH=10^-1.3
=0.0501
Reaction mechanisms will always have a minimum of how many steps?
Which reaction is exothermic? ch4 2o2 right arrow. co2 2h2o 891 kj nh4no3 h2o 25 kj right arrow. nh4 (aq) no3-(aq) 2h2o 286 kj right arrow. 2h2 o2 n2 o2 181 kj right arrow. 2no
Answer:
All are Endothermic reaction.
Explanation:
Answer:
CH4 + 2O2 --> CO2 + 2H2O + 891 kJ
Explanation:
Edge
What is the chemical formula for disulfur difluoride?
A. 252F
B. 2SF
C. S2F2
D. SZF
its C
All-seeing eyes:
my eyes see all, every answer so it is C
Explanation:
my eyes only speak the truth
Which of the following statements is true about the specific heat capacity of a substance?
A. It is an intensive physical property.
B. It is higher for good conductors.
C. It depends on the amount of substance.
D. It depends on the melting point of substance.
Answer:
Option A
Explanation:
Specific heat capacity is independent of quantity or it doesn't depends upon quantityHence it's intensiveOn opposite heat capacity is extensive
The specific heat capacity of a substance is an intensive physical property; option A.
What is specific capacity of a substance?The specific heat capacity of a substance is the amount in which the heat content of a unit mass of that substance will change when its temperature changes by one degree.
Specific heat capacity of a substance is an intensive property and does not depend on the mass of the substance.
Therefore, the true statement is that specific heat capacity of a substance is an intensive physical property.
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1.60 moles of gas has a volume of 7.50 L at 471 kPa. What is current temperature of gas?
Answer: Heyo Kenji Here! Here's your answer- 1.60 moles of a gas has a volume of 7.50L at 471 kPa. What is the current temperature of the gas? answer choices. (265 K).
Explanation: Hope this helps!
Have a nice day!
-Kenji ^^
HELP ME ASAP!
what is the purpose of putting cabbage water, baking soda, and vinegar experinment?
test for different types of molecules called acids and bases.
A solution in which, if additional solute is added, the solute will remain undissolved at the bottom of the container.
saturated solution: solution that has passed the saturation limit
In a sentence answer "Why do gases exert pressure on the walls of their container?"
Answer:
The pressure exerted by a gas is due to the random motion of particles in the gas. Gases have weak intermolecular forces and the particles are in continuous random motion and these particles collide with the walls of the container. These collisions with the walls of the container exert pressure on the gas.
Explanation: Hope this helps!!
Which substance has a standard enthalpy of formation of zero?.
Answer: In its natural condition, a pure element
how many grams is 0.456 mol of CaCO3 ?
Answer:
im not sure if this is right but i got 130.8760584
(keeping in mind that 1 mole is equal to 1 moles CAcO3, or 287.0089 grams.)
i may have rounded it wrong but hope this helps
If 5.00 × 1010 kilojoules of energy is released from a fusion reaction, what amount of mass in grams was lost? Use: `Δm = E/c^2` Recall that c = 3 × 108 meters per second.
choices:5.56 × 10-1
5.56 × 10, -, 1
5.56 × 10-4
5.56 × 10, -, 4
5.56 × 10-7
5.56 × 10, -, 7
5.56 × 10–10
The amount of the mass in grams that was lost from the fusion reaction is 5.56×10¯⁷ Kg
Data obtained from the question Energy (E) = 5×10¹⁰ JSpeed of light (c) = 3×10⁸ m/sMass (m) =?How to determine the mass
Energy is defined as the ability to work.
The mass can be obtained as follow
E = mc²
Divide both side by c²
m = E / c²
m = 5×10¹⁰ / 3×10⁸
m = 5.56×10¯⁷ Kg
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When broken down into root words what does thermohaline mean
Read the sentences from the Newsela article, "First All-Female Spacewalk Will Take Place During Women's History Month. "
"'I remember telling my mom at that time, and I never deviated from what I wanted to be. Something about exploration has fascinated me from a young age. "
What is the meaning of deviated?
A: struggled
B: recovered
C: strayed
D: profited
Answer:
C ; strayed
Explanation:
I took the k-12 quiz.
Answer:
C
Explanation:
I TOOK THE TEST
Students investigated the motion of wooden blocks on ramps. They used two boards,
each two meters long, to create ramps. They set the ramps up at different heights, as
shown in the diagram below. Next they took two identical blocks (I and II) and placed
one at the top of each ramp. They placed the blocks so that the back edge of each
block was even with the edge of the ramp (distance =0 meters). The students held the
O
blocks so that the blocks would not slide until the students released them. The students
released the blocks at time = 0 seconds. They measured the total distance traveled by
each block at 1-second intervals as the blocks slid down the ramps. The students recorded
their results as shown below.
Name two forces that acted on the block as they slide down the ramps. Describe how each forced you listed affected on the motion of the block.
The forces that act on the blocks as they descend the ramp are;
Weight of the blockReaction force on the blockApplied forceFrictional forceWhat is force?Force is that which is able to produce a push or a pull. Force causes an object to move from one point to another. For the body that is moving down the ramp there are four forces that act on it;
Weight of the blockreaction force on the blockApplied forceFrictional forceThe weight of the block moves it downwards, the reaction force moves the block upwards, the applied force moves the block forward while the fricional force opposes the forward movement of the block.
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Which of the following statements is true?
Automobiles are the leading cause of acid rain.
Both plants and animals can make protein using nitrogen compounds.
Animals add water vapor to the air through respiration.
Plants add water vapor to the air through photosynthesis.
Answer:
I think it's C. Animals add water vapor to the air through respiration
Explanation:
Which takes longer to orbit the Sun: Mars or Jupiter?
Answer:
jupiter
Explanation:jupiter is farther from the sun, so therefore it takes longer.
Describe in brief the role of zinc in human body.
What is the correct representation of a hydrated salt?.
An inorganic salt hydrate (hydrated salt or hydrate) is an ionic compound in which several water molecules are attracted by the ions and therefore enclosed within its crystal lattice. The general formula of a hydrated salt is MxNy.
The correct representation of the hydrate salt has the generic formula MxNy . nH₂O.
What is hydrate salt?Hydrate salt is defined as an ionic substance where several water molecules are drawn to the ions and hence trapped inside the crystal lattice. More than 50% of chemical industry products start with salt as the primary constituent. Additionally, the glass, paper, rubber, and textile sectors employ hydrated salt.
A hydrate is a salt that has a chemical interaction with water, and its formula is salt x H₂O, where x represents how many water molecules are joined to one salt molecule. CaSO₃.3H₂0, or calcium sulfate trihydrate, is an example of a hydrate and is written in this way even though the water molecules are not technically a part of the formula.
Thus, the correct representation of the hydrate salt has the generic formula MxNy . nH₂O.
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How many moles of h2so4 are needed to completely neutralize 0.0164 mol koh? mol h2so4
Answer: Heyo Kenji Here! Here's your answer- :0.0082 moles
Explanation: Hope this helps!
Have a nice day!
- Kenji ^^
Answer:
0.0082
Explanation:
how are primary and secondary pollutants alike?
Answer:
Primary pollutants are emitted from natural or anthropogenic sources directly into the atmosphere, while secondary pollutants result from the chemical reactions or the physical interactions between the primary pollutants themselves or between the primary pollutants and other atmospheric components.
Which of these is an oxidation half-reaction? upper v superscript 3 plus, plus e superscript minus right arrow upper v superscript 2 plus. upper f lower e, right arrow upper f lower e superscript 3 plus, plus 3 lower e superscript minus. upper c superscript 4 plus, plus 2 e superscript minus right arrow upper c superscript 2 plus.
Among the given reactions, those reaction which is an oxidation half-reaction is Fe → Fe³⁺ + 3e⁻.
What is oxidation reaction?Oxidation reaction in terms of electron will be described as those reactions in which removal of electron takes place.
V³⁺ + e⁻ → V²⁺In this reaction addition of electron takes place, so it is not an oxidation reaction.
Fe → Fe³⁺ + 3e⁻In this reaction removal of electrons takes place, so this is an oxidation reaction.
C⁴⁺ + 2e⁻ → C²⁺In this reaction addition of electron takes place, so it is not an oxidation reaction.
Hence Fe → Fe³⁺ + 3e⁻ shows oxidation half-reaction.
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Answer: The picture down below..Hope this helps <333
Explanation:
Change of state from a solid to a liquid with the addition of energy
Is what
Answer:
Melting
Explanation:
Identify and describe the different forms of precipitation shown in the images.
Two forms of precipitation. One is very small round pellets and the other is larger chunks or balls of ice.
Answer:
Sleet and hail, sleet are tiny drops of water that freeze when it rains. Hail forms when a thunderstorm lifts a water droplet above the freezing level.
Explanation: