Answer:
[tex]\boxed {\boxed {\sf B. \ 1.5 *10^{23} \ formula \ units}}[/tex]
Explanation:
1 mole of any substance contains the same number of particles. The particles can vary (atoms, molecules, formula units), but there are always 6.022*10²³ particles. In this case, the particles are formula units of potassium nitrate or KNO₃.
Let's create a ratio.
[tex]\frac {6.022*10^{23} \ formula \ units \ KNO_3}{1 \ mol \ KNO_3}[/tex]
Since we are trying to find the formula units in 0.250 moles, we multiply by that number.
[tex]0.250 \ mol \ KNO_3 *\frac {6.022*10^{23} \ formula \ units \ KNO_3}{1 \ mol \ KNO_3}[/tex]
The units of moles of potassium nitrate cancel.
[tex]0.250 *\frac {6.022*10^{23} \ formula \ units \ KNO_3}{1 }[/tex]
The denominator of 1 can be ignored, so we can make a simple multiplication problem.
[tex]0.250 *{6.022*10^{23} \ formula \ units \ KNO_3}[/tex]
[tex]1.5055 * 10^{23} \ formula \ units \ KNO_3[/tex]
If we round to the nearest tenth, the 0 in the hundredth place tells us to leave the 5 in the tenth place.
[tex]1.5 *10^{23} \ formula \ units \ KNO_3[/tex]
0.250 moles of potassium nitrate is approximately equal to 1.5*10²³ formula units of potassium nitrate and choice B is correct.
Select the correct answer.
How does substituting a hydrogen atom with a halogen in a hydrocarbon affect the resulting compound?
A.
All the single bonds in the original molecule change to double bonds.
B.
The boiling point of the new compound increases.
C.
The bonds between the carbon atoms in the molecule become weaker.
D.
The resulting compound is called a saturated hydrocarbon.
E.
The substitution allows each carbon atom to accept more than four valence electrons.
Answer:
E. The substitution allows each carbon atom to accept more than four valence electrons.
Explanation:
Halogens (except for fluorine) have seven valence electrons, which gives them the flexibility to participate in more than four covalent bonds. Hydrogen only has one valence electron, so it tends to form only four covalent bonds. In a substitution reaction, each halogen provides the carbon atom with additional electrons, allowing it to accept more than the usual four.
Answer:
C. The bonds between the carbon atoms in the molecule become weaker.
Explanation:
Please help I will give brainliest.
Answer:
the second one looks like it so I picked the second one
1. Do you believe we can bring an end to acid rain? How so?
2. What are some examples of land pollution?
Answer:
Emissions from Electricity. ...
Vehicle Emissions. ...
Reducing Electricity Consumption. ...
Reducing On-Road Vehicle Exhaust. ...
Other Considerations.
Steel is an alloy containing Fe atoms and C atoms. Which of the following diagrams best represents the particle-level structure of steel ?
the diagram that best represents the particle-level structure of steel as alloy is option (b).
Alloy, often known as an alloy, is a metallic material made up of two or more elements. Even though carbon, a nonmetal, is a crucial component of steel, the constituents of alloys are typically themselves metals.
Typically, melting the mixture of materials produces alloys. Early civilizations recognized the usefulness of alloys; brass (copper and zinc) and bronze (copper and tin) were particularly significant.
Steel is an alloy of iron and carbon. carbon range is upto 2 percent in the mixture.
In steel iron atoms are larger than carbon.
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SnO2 (s) + 2 H2 (g) → Sn (s) + 2 H2O (l)
What mass of water is produced when 57.6g of SnO2 are consumed in the reaction above?
Answer:
SnO2+2H2 - Sn +2H2O
50g of tin plus 32g of oxygen-36g of H2O
82g- 36g
57.6g- x
cross multiply
82xg= 2073.6g
xg = 2073.6/82
Xg= 25.28g
Therefore the mass of water consumed in the reaction is 25.28g
The molar mass of CCl4 is 153. 81 g/mol How many grams of CCl4 are needed to have 5. 000 mol?
The molar mass of CCl4 is 153. 81 g/mol. '769.0 g' of CCl4 are needed to have 5.000 mol.
What is molar mass?
Molar mass is the mass of one mole of a substance. It is usually expressed in grams per mole (g/mol). The molar mass of a substance is calculated by taking the sum of the atomic weights of all of the atoms in the molecule multiplied by the Avogadro constant (6.022x10^23).
To find the number of grams of CCl4 needed to have 5.000 mol, use the formula:
Mass (grams) = Molar mass (g/mol) x Number of moles
Mass (grams) = 153.81 g/mol x 5.000 mol
Mass (grams) = 769.0 g.
'769.0 g' of CCl4 are needed to have 5.000 mol.
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Estimate the net charge at pH=7. Assume the pKa values given in the table above. Term____
The net charge at pH=7. The pKa values given in the table above will term is referred as neutral.
At pH = 7, the solution is considered neutral, which means that the concentration of H+ ions is equal to the concentration of OH- ions, i.e [H+] = [OH-] = 10^-7 M.
To estimate the net charge at pH = 7, you would need to know the pKa values of the acid and the species present in the solution. It is important to note that the net charge at pH 7 will depend on the acid and species present in the solution, and the pKa values given for that specific acid. In a neutral solution, the pH is equal to 7, which means that the concentration of H+ ions is equal to the concentration of OH- ions. Since the pH is neutral, this means that the solution has no net charge. Neutral solutions contain equal concentrations of positive and negative ions, thus the net charge is zero.
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Consider the orbital diagram
shown. Which electron rule is
broken in the diagram?
1
1s 2s
2p
A. Aufbau Principle
B. Hund's Rule
C. Pauli Exclusion Principle
The electron rule is broken in the diagram is: (c) Pauli Exclusion Principle.
What is electron?An electron is a subatomic particle with a negative electric charge. It is found in atoms, and is the main component of electricity. Electrons are incredibly small, measuring only a fraction of a nanometer, and they are around 2000 times lighter than the smallest atom. Electrons are governed by the laws of quantum mechanics and they are move around the nucleus of an atom in discrete orbits. Electrons are responsible for chemical bonding between atoms, and they are essential for the formation of molecules.
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What particle has no electrical charge and is found in the nucleus?
O Proton
O Neutron
O Electron
Answer:
electron is the right answer
Answer:
[tex]\huge\mathfrak\red{Answer...} \\ \\ \huge\mathfrak\purple{neutron} \\ \\ \huge\mathfrak\pink{hope \: it \: helps..}[/tex]
You start with two reactants. One reactant has a mass of 13.6 grams and the other reactant has a mass of 72.9 grams. 22 grams of gas are released during the reaction. What is the total mass of all of the products formed in this reaction?
Answer:
64.5g
Explanation:
First you add the mass of reactant 1 and reactant 2, then you simply subtract the amount of gas released from your answer, and that would be the total mass of ALL the products formed.
My work:
13.6g + 72.9 = 86.5g
86.5g - 22g = 64.5g
What room in a house is similar to the chloroplasts in a cell
Before we use our imaginations to try and think of a fitting room, let's take a look at what a chloroplast is.
A chloroplast is the organelle in plant-based cells responsible for energy production. Through photosynthesis (you've probably heard of this before!), they use sunlight to create energy for the plant to function.
Since the chloroplast is the energy-maker for the cell, we need to imagine a room in a house that does something like this. There's a couple things that come to my mind. Firstly, although they don't really count as rooms, something like solar panels would probably make the most sense here. Since the answer asks for a room, though, solar panels don't work.
Maybe a kitchen? The kitchen is the room where food is created, supplying energy to all the inhabitants of a house.
I hope this helped! Learning about the components of cells is a little complicated at the start, but it's definitely a very exciting topic that only gets more and more interesting the deeper you delve into it.
- breezy ツ
56. A rigid cylinder with a movable piston contains a 2.0-liter sample of neon gas at STP. What is the
volume of this sample when its temperature is increased to 30.°C while its pressure is decreased to
90. kilopascals?
A) 2.5 L
B) 2.0L
C) 1.6L
D) 0.22 L
V2 = 2.499 2.5 L is the sample's volume when its temperature is raised to 30 °C and its pressure is lowered to 90 kilopascals.
What does the word "volume" actually mean?
The volume of an item is the space occupied inside its three-dimensional boundaries. A other word for it is the object's capacity.
What is the volume of the liquid?
The volume of liquid measured in a vessel's standard units is known as the liquid measurement. Infant milk bottle with milliliter measurement indications and juice bottle with a 1 liter capacity are two examples of vessels that have a "capacity" or "volume."
As,
Gas constant R is constant, so, Ideal gas equation can be written as,
P₁ V₁ / T₁ = P₂ V₂ / T₂
Solving for V₂,
V₂ = (P₁ × V₁ × T₂) ÷ (T₁ × P₂)
Putting Values,
V₂ = (101.325 KPa × 2 L × 303 K) ÷ (273 K × 90 KPa)
V₂ = 61402.95 ÷ 24570
V₂ = 2.499 ≈ 2.5 L
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How many liters are present in 10 grams of H2O ?
Answer:
About 0.01
Explanation:
1 grams of H2O = 0.0010
0.0010 x 10 = 0.01
What is the mass % of carbon in dimethylsulfoxide (C2H6SO) rounded to three significant figures? A) 7.74 B) 78.1 C) 25.4 D) 30.7 E) 28.6
The mass % of carbon in dimethyl sulfoxide (C2H6SO) rounded to three significant figure is calculated as 30.718%.
What is mass percentage?Mass percent of a solution is defined as the ratio of the mass of solute that is present in solution, relative to the mass of solution as a whole. To calculate mass percent of an element in a compound, we divide mass of the element in 1 mole of the compound by the molar mass and then multiply the result by 100.
As we know molar mass of carbon is 12 g/mol and molar mass of dimethyl sulfoxide is 78.13 g/mol
Mass % of carbon (C2) in dimethyl sulfoxide (C2H6SO) = 2* (12/78.13) * 100
= 30.718%
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Convert 100mL to L. Show your work to receive full credit.
Answer:
100 ml = 0.1 L
I divided 100 by 1000 because 1000ml = 1L
How is Ethyl Butyrate and Isovaleric Acid DIfferent?
Ethyl butyrate have one oxygen is an Aldehyde and isovaleric Acid have two oxygen is an carboxylic acid
Ethyl Butyrate is an ester with a molecular formula of C₆H₁₂O₂ and Isovaleric Acid is a carboxylic acid with a molecular formula of C₅H₁₀O₂.
What is an ester?In chemistry, an ester can be described as a compound derived from an oxoacid in which at least one hydroxyl group (-OH) is replaced by an alkoxy group (-O-R), as in the substitution chemical reaction of a carboxylic acid and an alcohol. But the carboxylic acid contains a carboxyl group (C(=O)OH) attached to an R-group.
Glycerides can be defined as fatty acid esters of glycerol and are one of the main classes of lipids and comprise the bulk of vegetable oils and animal fats.
Esters can be derived from carboxylic acids and are more frequently IUPAC nomenclature used for esters, based on the name for the acid followed by the suffix "-oate".
The chemical formulas of organic esters generally take the form RCO₂R’, where R and R′ are usually the hydrocarbon parts of the carboxylic acid and the alcohol respectively.
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Draw the structure of maleic acid ((Z)-but-2-enedioic acid).
The structure of maleic acid is H2C=CH2 with a double bond between two hydrogen atoms and a double bond between the second and third carbon atoms in the three carbon chain.
H3C-C=C-COOH
\ /
H2C=CH2
1. Draw a three carbon chain with a double bond between the second and third carbon atoms
H3C-C=C-COOH
2. Add two hydrogen atoms to the second carbon atom
H3C-C=CH2-COOH
3. Draw a double bond between the two hydrogen atoms
H2C=CH2-COOH
H2C=CH2
\ /
H3C-C=C-COOH
The structure of maleic acid is H2C=CH2 with a double bond between two hydrogen atoms and a double bond between the second and third carbon atoms in the three carbon chain.
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which of the following is a testable hypotheses?
O A. if I brush my teeth, I will get fewer cavities than if i don’t brush my teeth.
O B. it’s wrong not to brush your teeth before you have an important conversation with someone.
O C. Green toothpaste taste better than blue toothpaste or red toothpaste.
O D. smart, careful, healthy people always brush their teeth.
Answer:
A
Explanation:
because its the only one that can be tested
|||Good points and Brainliest||| Explain the biological pump
(have at least 3 sentences pls)
Answer:
The biological pump or the marine carbon pump is the title for multiple processes leading to separation of carbon from multiple sources of water. Biological pumping is partially responsible for the cycling of organic matter. This process can lead to loss of contact between carbon and the atmosphere for thousands of years.
Hope this helped!
Which type of reaction is indicated by a positive AH?
o an endothermic reaction
O a reversible reaction
O a spontaneous reaction
O an exothermic reaction
Answer:
An endothermic reaction
Explanation:
A positive sign indicates that energy is absorbed. Hence it is an endothermic reaction.
A reversible reaction is indicated by a double arrow on the chemical equation.
A spontaneous is indicated by negative Gibbs Free Energy (G) value.
An exothermic reaction is indicated by a negative enthalpy change
A 250. cm3 sample of neon is collected at standard temperature and pressure. Assuming the volume remains constant, what would be the pressure of the neon at 44.0°C?
a) 118 b)87.2 c) 0.00 d)290
Answer:
The answer is 118 kPa.
Explanation:
How many moles are in 1gm?
The mole is the fundamental unit of substance quantity in the SI. 0.041143797572516 moles make up 1 gram of magnesium. The grams to moles formula Use the grams to moles formula to calculate the number of moles, n, of a substance with a given mass, m, (in grams) accurately. n = m / M.
Depending on the substance, yes. As a reminder, a mole is equal to 6.02 1023 atoms and is used to measure quantities. Therefore, it stands to reason that lead and hydrogen would weigh differently. Less moles would be required because it would take a lot fewer lead atoms to make up 1 gram. However, one hydrogen atom has far less mass than one lead atom, therefore more atoms (and moles) would be required to create one gram.
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Predict the molecular geometries of the following species, respectively: IF3, TeF4, XeF51+.
a. T-shaped, see-saw, square pyramidal
b. trigonal planar, tetrahedral, square pyramidal
c. trigonal pyramidal, tetrahedral, see-saw
d. trigonal planar, see-saw, square planar
e. trigonal pyramidal, square planar, linear
a. T-shaped, see-saw, square pyramidal.IF3: The Lewis structure of IF3 consists of a central I atom, which is surrounded by three F atoms.
IF3: The Lewis structure of IF3 consists of a central I atom, which is surrounded by three F atoms. The three F atoms are arranged in a symmetric, T-shaped geometry.
TeF4: The Lewis structure of TeF4 consists of a central Te atom, which is surrounded by four F atoms. The four F atoms are arranged in a symmetric, trigonal planar geometry.
XeF5+: The Lewis structure of XeF5+ consists of a central Xe atom, which is surrounded by five F atoms. The five F atoms are arranged in a symmetric, square pyramidal geometry.
a. T-shaped, see-saw, square pyramidal.
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H_ _t
tis produced from many kinds of fuel. It travels from an area of higher temperature to an area of lower temperature
Which of the compounds below would contain polar covalent bonds? F2, N2O, KCl A. KCl only B. N2O only C. F2 only D. Both F2 and N2O
The compound below that would contain polar covalent bonds is : B. N2O only .
What do you understand by polar covalent bonds?Polar covalent bond is a covalent bond in which electron density is unevenly shared between the two bonded atoms, due to the difference in electronegativity or due to the inductive effects.
An example of a polar bond is the bond in water between hydrogen and oxygen and bond is classified as polar bond because it has a large electronegativity difference of 1.4. Electrons in hydrogen are more attracted to the electrons in oxygen as oxygen is more electronegative.
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Classify each amino acid according to whether its side chain is predominantly protonated or deprotonated at a pH of 7. 40. The p K a values of the Asp, His, and Lys side chains are 3. 65 , 6. 00 , and 10. 53 , respectively
His and Lys are deprotonated but Asp will be protonated.
What is amino acids?Organic substances that possess both amino and carboxylic acid functional groups are known as amino acids. Although hundreds of amino acids occur in nature, the alpha-amino acids that constitute proteins are by far the most significant. The genetic coding contains only 22 alpha amino acids. Amino acids are chemicals that make proteins when they combine. The building blocks of life are amino acids and proteins. Amino acids are left over after proteins are digested or broken down. To support the body, the human body utilizes amino acids to build proteins: Food should be broken down.
Here,
As the pH is given as 7.4 and pK of His is given as 6.00. There will occur a positive charge on His when it's pH < pK therefore, it is neutral at the given pH.
As the pK value of Lys is 10.53 that is greater than the pH of 7.40. Therefore, charge on Lys is positive.
As the pK value of Asp is 3.65 which is less than the pH value of 7.40. Hence, Asp has a negative charge.
Therefore, we can conclude that His and Lys are deprotonated but Asp will be protonated.
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Glucose gives off 2808 kJ/mol when burned, how much energy can be
produced from 935 grams? *
O 14602 kJ
O 15.6 kJ
O 0.3330 kJ
O 3.00 kJ
Graph the system on a separate sheet of paper and determine the number of solutions it has one solution If it has one
determine its coordinates.
2x + 3y = 12
2x - y = 4
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Calculate the mass in grams of 4.96 mol of titanium (Ti).
A food worker needs to
measure the temperature of
cold-held potato salad.
Where should she check the
temperature?
If a food service employee has to check the temperature of cold potato salad, she should do so at multiple places throughout the salad
If the dish is maintained between 40 and 140 degrees Fahrenheit, potato salad can be consumed around two hours after cooking. A nice approach to keep salad fresh for a long time is to refrigerate it at 40 F. Before reaching 140 F, the hot salad can be reheated.
Addition than potatoes, the salad ingredients may contain other ingredients with varying rates of cooling. Therefore, it is necessary to take temperature readings of the potato salad at various locations.
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The complete question is-
A food worker needs to measure the temperature of cold-held potato salad where should she check the temperature
A. On the surface of the salad
B. Along the side of the salad dish
C. In multiple places throughout the salad
D. On the temperature gauge of the holding equipment