Answer:
B
Explanation:
A 45.3 g sample of potassium nitrate is dissolved in enough water to make
225 mL of solution. Determine the molar concentration of the potassium nitrate.
Answer:
1.99 M
Explanation:
It gives the mass of a compound, KNO3. First, find the gram formula mass of KNO3. You should get 101.102 g/mol, or something very close. Next, divide given mass by g/mol mass to get number of moles. In this case, 45.3/101.102 = .44806, roughly.
Now, since it says molar concentration, it is asking for moles per liter of solution. If it only gives you 225 mL, or .225 L, you have to adjust for that value. Divide the number of moles you have by number of liters.
.44806/.225 = 1.99 M. This isn't the exact answer, but always remember to round for significant figures. Since both numbers contain 3 significant figures, your answer should have 3. Therefore 1.99 is your answer.
100 points help is appreciated
Apply: For a strong base, the concentration of hydroxide ions [OH–] is roughly estimated to be the same as the concentration of the base. The pH of a strong base is found with the equation pH = 14 + log10[OH–]. Based on their concentrations, find the pH of each of the strong bases. Check your answers with the Gizmo.
Answer
[Ca(OH)2] = ?
pH Ca(OH)2 = ?
[NaOH] = ?
pH NaOH = ?
Litmus is an example of an indicator, a substance that changes color depending on its pH (pH is a measure of the concentration of protons, or H+ ions). In the Titration Gizmo™, you will use indicators to show how acids are neutralized by bases, and vice versa.
To begin, check that 1.00 M NaOH is selected for the Burette, Mystery HBr is selected for the Flask, and Bromthymol blue is selected for the Indicator.
Calculate: Concentration is measured by molarity (M), or moles per liter. Brackets are also used to symbolize molarity. For example, if 0.6 moles of HNO3 are dissolved in a liter of water, you would say [HNO3] = 0.6 M.
Because HNO3 is a strong acid, it dissociates almost completely in water. That means the concentration of H+ is very nearly equal to that of HNO3.What is [H+] if [HNO3] is 0.01 M? 0.01 M
The pH of a solution is equal to the negative log of H+ concentration: pH = –log[H+]
Describe: The equation for the reaction of nitric acid (HNO3) and sodium hydroxide (NaOH) is shown on the bottom right of the Gizmo.
Measure: A titration can be used to determine the concentration of an acid or base by measuring the amount of a solution with a known concentration, called the titrant, which reacts completely with a solution of unknown concentration, called the analyte. The point at which this occurs is called the equivalence point.
Explain: A titration curve is a graph of pH vs. volume of titrant. The graph at right shows a typical titration curve for the titration of a strong acid by a strong base. (A strong base is one that has relatively high dissociation in water.)
According to theBrønsted-Lowry definition, an acid is a substance that is capable of donating a proton to another substance. A base is a substance that accepts protons. When an acid and a base are combined, the acid is neutralized as the base accepts the protons produced by the acid.One way to determine if a solution is acidic or basic is to use litmus paper, as shown above. There are two types of litmus papers: red and blue.How does litmus paper indicate an acid? Both strips turn red.
How can professionals increase their levels of stress as a result of personal work habits?
Working at a steady rate
Developing work ethics
Procrastinating
Setting personal goals
Answer:
A
Explanation:
Developing work ethics won't lower your stress although it may make your conscience a little happier. Not B
Not C. Procrastinating just makes things harder. The mountain of things to do is not diminishing at all and your stress knows it.
Not D. Although D is the second best answer, setting goals is not really an action. It is a plan for how to work. But it is not work. Still having a goal is useful.
The answer is A. Just keep hitting what you have to do at a steady pace.
disadvantage of using a lid on a crucible
2(NH4)₂Cr₂ What are the names of the atoms make up the above formula?
Answer:
Nitrogen, Hydrogen, Chromium
Explanation:
N= Nitrogen
H= Hydrogen (it is not helium because helium is "He")
Cr= Chromium
What is the active element in most photovoltaic cells?.
Answer:
if you mutliply 8x2 it would be 16 and half of 16 is 8 and if you multiply that by 2 you get 16 again and then if you multiply that by 2 it comes out to 32 then devide that by 2 and you get 16 then divide again and you get 8
Explanation:
Answer:
silicon is the most common semiconductor used in computer chips
À container's filled with 28 liters of argon gas at a temperature of 353 K. If the gas is
held at 4.9 atm of pressure, how many moles of the gas are in the container?
Answer: 4.74 moles of gas are in the container.
Explanation:
1. Use the ideal gas law. PV = nRT. and re-arrange from moles by divided RT on both sides.
2.You should get the following equation: [tex]n=PV/RT[/tex]
3.Insert values: [tex]n = PV/RT = \frac{(4.9 atm)(28 L)}{(0.082 (L*atm)/(K*mol)*(353K)} = 4.74 moles.[/tex]
4.There are 4.74 moles in the container.
Good luck with chemistry!
What is the mass of 0.5 moles of carbon tetraflouride
Answer:
44 g
Explanation:
hope this helps
what two types of ions do oysters need to form shells
Under which conditions the temperature and pressure is a gas most soluble and water
We know
[tex]\\ \rm\Rrightarrow S\propto T[/tex]
Higher the temperature higher the solubilityAccording to gay lussac's law
[tex]\\ \rm\Rrightarrow P\propto T[/tex]
If temperature is high pressure is also highSo our answer is high pressure and high temperature
What is the reason behind that the melting and boiling point of iron is more than that of sodium? Write any two differences between metalloids and alloys.
Answer:
difference between metal and alloy is that the metal is a pure substance whereas the alloy is a mixture of two or more components.
Explanation:
Mostly the metalloids have the appearance just like the metallic appearance And also they are the brittle one's . Boron and silicon are the example. Note; By combining with other metals metalloid can form the alloy
26. 8 g of ammonium chloride is dissolved in water to make a 0. 25 L solution. What is the molarity of the solution?
Answer: 0.5 M
Explanation:
Ammonium chloride has a gram formula mass of 53.49 g/mol, so 26.8 grams of ammonium chloride is 26.8/53.49 = 0.501 mol.
So since molarity = (moles of solute)/(liters of solution), the answer is 0.501 / 0.25 = 0.5 M
In a pure sample CH₂F₂, what forces of attraction exists between molecules?
Answer: what is this give more esplanation
Explanation:
The forces of attraction that are present or exist between molecules of [tex]CH_2F_2[/tex] are as follows:
Dipole-dipole interaction.Hydrogen bonding.London Dispersion force. What is the Force of attraction?The force of attraction may be defined as a type of property that pulls the body towards its surface. It is the one through which atoms in molecules or elements are held together with different characteristics on the basis of their structure and functions.
It is known that fluorine has a higher electronegativity than carbon atoms. This difference in electronegativity is responsible for constructing a polar molecule. This significantly illustrates dipole-dipole interaction. It also demonstrates London-dispersion force which refers to the force between atoms and molecules.
It is a mechanism that overall represents the characteristics of each and every element specifically. The force of attraction governs the stability and functionality of the element and molecule as well.
Therefore, The forces of attraction that are present or exist between molecules of [tex]CH_2F_2[/tex] are Dipole-dipole interaction, Hydrogen bonding, and the London Dispersion forces.
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A particular .55 m solution contains 1.7 g of salt what mass would be present in the same volume of a 3.20 m solution
Answer: 9.9 g
Explanation:
We can set up a proportion:
1.7/.55 = x/3.20
x = 9.9 g (to 2 s.f.)
what is an oxidation reaction
Answer:
Oxidation: loss of electrons, gain of oxygen
What is the oxidation state of Hydrogen in H20
+2
+1
-2
-1
Oxygen almost always has an oxidation number of -2, except in peroxides (H 2 O 2) where it is -1 and in compounds with fluorine (OF 2) where it is +2. Hydrogen has an oxidation number of +1 when combined with non-metals, but it has an oxidation number of -1 when combined with metals.
Sure hoep this helps you :)Which of the following will lose 2 electrons to become stable?
Answer:
Magnesium,Berillium,
Explanation:
they they belong to group II
How to determine anode and cathode in galvanic cell.
Answer:
electrons flow from left to right
Explanation:
the electrons flow from anode to cathodeoxidation half cell reaction occurs in the anodereduction half cell reaction occurs in the cathodeDo bases react with metals the same way that acids do?.
Answer:
Bases do not react with metals in the way that acids do
Explanation:
hope this helps
pls mark brainliest
Which of the following liquids would turn
blue litmus paper red?
1. orange juice
2. milk of magnesia
3.
distilled water mixed with a little baking soda
4. oven cleaner
Answer:
orange juice because it a type of acid.
Can someone please help me?
D. Petroleum
Answer:
Water and plastic
Explanation:
The other two dont make as much sense
Consider the intermolecular forces present in a pure sample of each of the following compounds: CH3CH2CH2NH2 and CH3CH2C02H. Identify the intermolecular forces that these compounds have in common. A) Dipole-dipole forces and hydrogen bonding. B) Dipole-dipole forces only. C) Dispersion forces, dipole-dipole forces, and hydrogen bonding. D) Dispersion forces and dipole-dipole forces
The common intermolecular forces present in the compounds CH3CH2CH2NH2 and CH3CH2C02H are Dispersion forces, dipole-dipole forces, and hydrogen bonding.
What are intermolecular forces?Intermolecular forces are forces of attraction between molecules of the same compound.
Intermolecular forces are important in the physical properties of molecules.
Some intermolecular forces are:
Dipole-dipole forceshydrogen bondingDispersion forcesThe given compounds are contain hydrogen bonding and London dispersion forces as well as dipole-dipole forces.
Therefore, the common intermolecular forces present in the compounds CH3CH2CH2NH2 and CH3CH2C02H are Dispersion forces, dipole-dipole forces, and hydrogen bonding.
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can someone tell me what 2200 kg is
Answer:
4850.17
for an approximate result, multiply the mass value by 2.205
Explanation:
2200 Kg is an weight which is going to be 4850.17 pounds.
Kg is the unit and 2200 the amount of that unit. If your question wasn't that(looks like you might have missed something) then please put a comment so I can give you a better answer.
what is gold in the periodic table?
Symbol: Au
Atomic Number 79
Electron number: 79
State at room temperature: solid
what is the molar mass of sodium chloride
Answer:
58.44 g/mol
hope it helps :)
mark brainliest!
The two highest levels of the atmosphere contain only small amounts of oxygen, nitrogen, and ozone. These layers are the
Answer:
mesosphere and thermosphere
Explanation:
Nobelium-254 has a half life of 3 seconds. How many half-lives would have to occur to
reduce a 15g sample down to 0.09375g?
the number of half-lives that would have occur to reduce a 15 g sample of Nobelium-254 down to 0.09375 g is 7.3
To calculate the number of half-lives that would have occur to reduce a 15 g sample of Nobelium-254 down to 0.09375 g, we use the formula below.
Formula:
2ⁿ = R/R'........... Equation 1Where:
n = Number of half-lives that have occuredR = Original mass of Nobelium-254R' = Mass of Nobelium-254 after decayFrom the question,
Given:
R = 15 gR' = 0.09375 gSubstitute these values into equation 1
2ⁿ = 15/0.093752ⁿ = 160n = log160/log2n = 7.3 half-livesHence, the number of half-lives that would have occur to reduce a 15 g sample of Nobelium-254 down to 0.09375 g is 7.3
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Carbon sequestration technology, which limits the emission of the greenhouse gas carbon dioxide (CO2) into the atmosphere, is currently used by _______% of all coal-fired power plants in the USA.
25% of all coal fired power plants in the United States of America uses the Carbon Sequestration technology.
Carbon Sequestration TechnologyCarbon sequestration can be defined as the process of capturing and storing atmospheric carbon dioxide. It is one method of reducing the amount of carbon dioxide in the atmosphere with the goal of reducing global climate change.
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What is the name of this hydrocarbon? a chain of 3 carbon atoms, with h bonded to each end of the chain and below each c. h is also bonded above the first and third c; the center is bonded to another c, which in turn is bonded to 3 h. 1-methylbutane 2-methylbutane 2-methylpropane 3-methylpropane
The correct IUPAC name for this compound as described here is 2-methylpropane.
What is IUPAC nomeclature?The term IUPAC nomeclature refers to the generally accepted pattern for the naming of compounds. The international Union of Pure and applied chemistry (IUPAC) provides the guidelines for naming compounds. This system of nomenclature helps us to be able to write the unique name of a compound from its structure.
In the system of IUPAC, the parent name is the longest chain in the compound. The substituents are then given numbers in alphabetical order.
Now, the correct IUPAC name for this compound as described here is 2-methylpropane.
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Answer:
2-methylpropane
Explanation:
right on edge2022
Distinguish between an acidic and a basic oxide.
(Select all that apply.)
1. In a basic oxide, element forms ionic bonds with oxygen.
2. A basic oxide is an oxide that reacts with bases.
3. A basic oxide is an oxide that reacts with acids.
4. In a basic oxide, element forms covalent bonds with oxygen.
5. An acidic oxide is an oxide that reacts with acids.
6. In an acidic oxide, element forms ionic bonds with oxygen.
7. In an acidic oxide, element forms covalent bonds with oxygen.
8. An acidic oxide is an oxide that reacts with bases.
Answer:
See below ~
Explanation:
Basic oxides
In a basic oxide, element forms ionic bonds with oxygenA basic oxide is an oxide that reacts with basesAcidic oxides
An acidic oxide is an oxide that reacts with acidsIn an acidic oxide, element forms covalent bonds with oxygen