Answer:
1is the answer to that one day F
5. 1.00 mol HNO3 is treated with 4.47 g of magnesium. Calculate the number of moles of
HNO3 after all the metal has reacted. The unbalanced reaction is
HNO3 (aq) + Mg(s) + Mg(NO3)2 (aq) + H2(g)
a. 0.632 mol b. 0.184 mol c. 1.00 mol d. OM(all HNO3 used up)
Answer:
The balanced equation is:
2 HNO3 + Mg ---> Mg(NO3)2 + H2
From the equation, we can see that we need twice the moles of HNO3 than the moles of Mg
Moles of Mg:
Molar mass of Mg = 24 g/mol
Moles = Given mass / Molar Mass
Moles of Mg = 4.47 / 24 = 0.18 moles (approx)
Hence, 2(moles of Mg) = 0.36 moles of HNO3 will be consumed
Number of moles of HNO3 after the reaction is finished is the number of unreacted moles of HNO3
Unreacted moles of HNO3 = Total Moles - Moles consumed
Unreacted moles of HNO3 = 0.64 moles (approx)
Since we approximated the value of moles of Mg, the value of remaining moles of HNO3 will also be approximate
From the given options, we can see that 0.632 moles is the closest value to our answer
Therefore, 0.632 moles will remain after the reaction
What are the main differences between plang and animal cells
When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 22.24 g of Cs2SO4(s) are dissolved in 106.70 g of water, the temperature of the solution drops from 25.62 to 22.57 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.65 J/°C. Based on the student's observation, calculate the enthalpy of dissolution of Cs2SO4(s) in kJ/mol. Assume the specific heat of the solution is equal to the specific heat of water.
Answer:
26.85kJ/mol is the heat of dissolution of Cs₂O₄
Explanation:
The process of dissolution of Cs₂SO₄ in water occurs as follows:
Cs₂O₄(s) → 2Cs⁺(aq) + SO₄²⁻(aq) + ΔH
Where ΔH is the change in heat per mole of Cs₂O₄
The first we can see is ΔH > 0 because heat is absorbed (Temperature is decreasing) when the reaction occurs.
Now, the change in heat of reaction is:
q = Heat calorimeter + Heat solution
q = ΔT*1.65J/°C + S*m×ΔT
Where q is the heat of reaction.
ΔT is change in temperature: 25.62°C - 22.57°C = 3.05°C
S is specific heat of solution = Specific heat water = 4.184J/g°C
m is mass of solution = 22.24g + 106.70g = 128.94g
Replacing, heat of reaction is:
q = 3.05°C*1.65J/°C + 4.184J/g°C*128.94g×3.05°C
q = 1650J are absorbed when 22.24g of Cs₂O₄ reacts
Moles of 22.24g of Cs₂O₄ are - Molar mass: 361.87g/mol-:
22.24g * (1mol / 361.87g) = 0.06146 moles
That means, when 0.06146 moles of Cs₂O₄ react, the heat absorbed is 1650J. That means the heat absorbed per mole of Cs₂O₄ (Enthalpy of dissolution) is:
1650J / 0.06146 moles = 26847J / mol =
26.85kJ/mol is the heat of dissolution of Cs₂O₄
which two chemists organized elements based on properties such as how the elements react or whether they are solid or liquid
Answer: Dmitri Mendeleev and Henry Moseley developed their periodic tables about forty years apart. During that time, many discoveries in chemistry were made.
Explanation:
Hope this helps
a swimming pool has a volume of 166.9 cubic meters. how many gallons of water can the pool hold
Answer:
V=44090.30 gallons
Explanation:
Given that,
Volume of a swimming pool is 166.9 m³.
We need to find m³ to gallons.
We know that the conversion from m³ to gallon is given by :
[tex]1\ \text{m}^3=264.172\ \text{gallons}[/tex]
To convert 166.9 m³ to gallons, multiply it by 264.172. So,
[tex]166.9\ \text{m}^3=166.9 \times 264.172\ \text{gallon}\\\\=44090.30\ \text{gallon}[/tex]
It can hold 44090.30 gallons of water.
When liquid gold becomes a solid, its particles get closer together. Which best describes what happened to the gold?
the conservation of magnetism
the change in solubility in a physical change
the change in melting point in a physical change
the rearrangement of particles in a physical change
Answer:
The rearrangement of particles in a physical change.
Explanation:
When things are liquid the particles tend to be spread out because they aren't tightly compacted as they would be with a solid. So when liquid gold is changing from a liquid to a solid the properties are changing and the particles in the gold are getting closer together.
Answer:
D is correct answer
Explanation:
Which statement below is the BEST explanation for the differences
between electronic and molecular structures?
A) Lone pair electrons cannot be seen and take up more space which makes the
electronic & molecular shapes different.
B)The bond angles are different when there are lone pairs, which makes the
electronic & molecular shapes different.
C)Bonding electrons can be seen, which makes the electronic & molecular shapes
different
Answer:
A
Explanation:
Electron geometry describes the arrangement of electron groups. Molecular geometry describes the arrangement of atoms, excluding lone pairs.
ok so whats the answer
Answer:
Is there a question?
Explanation:
hat volume of a 0.540 M NaOH solution contains 12.5 g NaOH
Answer:
At 0.58 L of 0.540 M NaOH solution contain 12.5 g NaOH.
Explanation:
Given data:
At volume = ?
Mass of NaOH = 12.5 g
Molarity of solution = 0.540 M
Solution:
First of all we will calculate the number of moles of sodium hydroxide.
Number of moles = mass/molar mass
Number of moles = 12.5 g / 40 g/mol
Number of moles = 0.3125 mol
Volume of NaOH:
Molarity = number of moles / volume in L
Now we will put the values.
0.540 M = 0.3125 mol / volume in L
volume in L = 0.3125 mol / 0.540 mol/L
volume in L = 0.58 L
The total volume required to reach the endpoint of a titration required more than the 50 mL total volume of the buret. An initial volume of 49.17±0.04 mL was delivered, the buret was refilled, and an additional 1.56±0.04 mL was delivered before the endpoint was reached. The titration of a blank solution without the analyte required 0.60±0.04 mL . Calculate the endpoint volume corrected for the blank and its absolute uncertainty. Note: Significant figures are graded for this problem. To avoid rounding errors, do not round your answers until the very end of your calculations. volume: mL ± mL
Answer:
The answer is "[tex]\bold{50.42 \pm 0.08}[/tex]".
Explanation:
Overall delivered volume [tex]= [(49.06 \pm 0.05) + (1.77 \pm 0.05)]\ mL[/tex]
Its blank solution without any of the required analysis [tex]= (0.41 \pm 0.04)\ mL[/tex]
Compute the volume of the endpoint as follows:
Formula:
[tex]\text{End point volume = Total Volume delivered - volume required}[/tex]
[tex]= (49.06 \pm 0.05) + (1.77 \pm 0.05) - (0.41 \pm 0.04) \\\\= (49.06 + 1.77 - 0.41) \pm \ \ (absolute \ \ uncertainty)[/tex]
therefore,
absolute uncertainty [tex]=\sqrt{(0.05)^2 + (0.05)^2 + (0.04)^2}[/tex]
[tex]=\sqrt{0.0025 +0.0025 +0.0016} \\ \\=\sqrt{0.0066}\\\\=0.08124\\[/tex]
The Endpoint volume [tex]= (49.06+1.77-0.41)\pm (0.08124)[/tex]
[tex]= 50.42 \pm 0.08[/tex]
Therefore, the volume of the endpoint adjusted for the blank is:
[tex]\bold { = 50.42 \pm 0.08}[/tex]
Which of the following carbocations would be expected to rearrange? Check all that apply. Check all that apply. A line-angle formula shows a ring with six vertices, a CH3 group attached to the first vertex, and a plus charge at the first vertex. A line-angle formula shows a ring with six vertices, a CH3 group attached to the first vertex, and a plus charge at the second vertex. A line-angle structure has three carbon atoms in the chain with two CH3 groups attached to the first carbon, a CH3 group attached to the second and the third carbon atoms, and a plus charge at the second carbon. A line-angle structure has two carbon atoms in the chain with a CH3 group attached to both carbon atoms and a plus charge at the first carbon. A line-angle formula shows a ring with six vertices, a CH3 group attached to the first vertex, and a plus charge at the fourth vertex. A line-angle structure has two carbon atoms in the chain with two CH3 groups attached to the first carbon, a CH3 group attached to the second carbon atom, and a plus charge at the second carbon.
Answer: A line-angle structure has two carbon atoms in the chain with two CH3 groups attached to the first carbon, a CH3 group attached to the second carbon atom, and a plus charge at the second carbon.
Explanation:
In the structure described in this option, the carbon atom is secondary. Remember that in the order of stability of carbocations; tertiary > secondary > primary > methyl.
Hence, the secondary carbocation can undergo rearrangement to yield a tertiary carbocation which is more stable.
What is the net ionic equation for a reaction between HCl and NaOH
Answer:
What is the net ionic equation for a reaction between HCl and NaOH?
Explanation:
A salt is a neutral ionic compound. Let's see how a neutralization reaction produces both water and a salt, using as an example the reaction between solutions of hydrochloric acid and sodium hydroxide. The overall equation for this reaction is: NaOH + HCl → H2O and NaCl
Hope that helped.
Answer: H+(aq) + OH−(aq) → H2O(l)
Explanation: The net ionic equation is H+(aq) + OH−(aq) → H2O(l). The complete ionic equation will show all aqueous substances as ions while pure liquids and solids will be shown in their molecular form as that is how they exist in solution.
How many electrons are in an atom of elemental sodium?
equal to the number of neutrons
equal to the number of protons
equal to the number of protons and neutrons
Answer:
its the second option
equal to the number of protons
Explanation:
took the test
Answer:
equal to the number of protons
Explanation:
2021 edge
Consider the element in the periodic table that is directly to the right of the element identified in part (a). Would the 1s peak of this element appear to the left of, the right of, or in the same position as the 1s peak of the element in part (a)? Explain your reasoning.
The question is incomplete. Here is the complete question.
The photoelectron spectroscopy is shwon below.
(a) Based on the photoelectron spectrum, identify the unknown element and write its electron configuration.
(b) Consider the element in the periodic table that is directly to the right of the element identified in part (a). Would the 1s peak of this element appear to the left of, the right of, or in the same position as the 1s peak of the element in part (a)? Explain your reasoning.
Answer and Explanation: Photoelectron Spectroscopy is a method of determinining the relative energy of electrons in atoms and molecules.
It is based on the photoelectric effect: when a radiation energy incides on a substance, an electron is ejected from it. If we know the kinetic energy of the ejected electron, known as photoelectrons, and the energy of the incident radiation, it is possible to find the energy of the electron in the substance.
The energy needed to eject an electron from the sample is called Binding Energy and in an atom, depends on which shell the electron is: valence eletrons (outermost shell), binding energy is lower; core eletrons (innermost shell), binding energy is highest.
In the graph, vertical axis shows 5 peaks for different energies. The peak closer to the origin, the leftmost peak, correspond to the 1s subshell, since their are closest to the nucleus, and so, has the highest binding energy.
Following from left to the right, we noticed:
First, second and fourth peaks has the same height;Third peak's height is 3x higher than 1st, 2nd and 4th;Fifth peak is one unit higher than first, second and fourth;(a) Then, we can conclude the eletron configuration of the element is
[tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{3}[/tex]
which is Phosphorus with atomic number of 15.
(b) The element to the right of element P is Sulfur (S). The peak 1s of sulfur will appear in the same position as the 1s peak of Phosphorus, because the elements in the Periodic Table are grouped according to certain properties. Elements in the same horizontal line are elements in the same period, which one of the characteristics is they have the same total number of electron shells.
For determining the toxicity of different compounds, the concept of LD50, the lethal dose for 50% of test subjects is used. The LD50in rats for potassium cyanide is 1.52mg per 1 kg of body weight. Assuming the same LD50for humans, determine the molarity of potassium cyanide in a 355 mL (12 ounces) drink that would correlate to the LD50for a person having a mass of 170.0 lbs.
Answer:
Explanation:
LD 50 in rat = 1.52 mg per kg of body weight .
Body weight of man = 170 lbs = 170 / 2.2 kg = 77.27 kg
LD = 1.52 x 77.27 mg = 117.45 mg = .11745g
molecular weight of potassium cyanide = 65.12 g
moles of potassium cyanide = .11745 /65.12 = .0018 moles
.0018 in .355 L
molarity of solution = .0018 / .355 = .005 M .
Select the false statement regarding the properties of liquids. Viscosity is the resistance of a liquid to flowing. Cohesion and adhesion help to explain capillary action. Adhesion is the attraction of atoms and molecules to like particles. Liquids with strong intermolecular forces tend to have high surface tensions. The tendency of a liquid to minimize its surface is referred to as surface tension.
Answer:
Adhesion is the attraction of atoms and molecules to like particles.
Explanation:
Liquid as a state of matter is defined by certain properties. According to this question, the following description of the properties of liquids are true except that Adhesion is the attraction of atoms and molecules to UNLIKE PARTICLES.
- Viscosity, as rightly stated, is the resistance of a liquid to flowing
- Capillary action, which is the pulling up of a liquid against gravity, is aided by the cohesive and adhesive properties of that liquid.
- Surface tension, which is the energy required to resist external forces, thereby increasing its surface area, is dependent on the strength of the intermolecular forces of the liquid particles.
- Surface tension, according to this question, is the ability of a liquid to minimize its surface area.
The above points are true except adhesion is the attraction of atoms and molecules to like particles, which is false.
Acetylsalicylic acid (ASA) _____.
A.is used to treat acne
B.reduces pain and fever
C.is used as an anesthetic
D.causes acid rain
Answer:
b. reduces pain and fever
✅Acetylsalicylic acid (ASA) _____. reduces pain and fever
IamSugarbee
Why are the so many volcanoes in california help pls!!
Explanation:
During and after an explosive or effusive eruption volcanic hazards are still a concern. Unstable ground, noxious gas emissions, and intense heat from fumaroles (steam vents) and hot springs are dangerous. Loose volcanic debris on the flanks of the volcano can be mobilized by heavy rainfall or melting snow and ice, forming powerful floods of mud and rock (lahars) resembling rivers of wet concrete. These can rush down valleys and stream channels, destroying roads and bridges and carrying away entire buildings
hope the answer is correct
basically everything is in the picture, and i dont really understand please help.
Explain the relevance of atomic particles in healthcare setting
Answer:
The relevance of atomic particles in healthcare setting is that atomic particles contain the core properties of an organism or compound.
Having a good knowledge of it means that designing of drugs and treatment is easier as a result of modifications done to the atomic particles to enable an accurate solution in areas of healthcare and Drug production
Some animals only have ___ cell.
Some animals only have a single cell.
What are cells?
Cells are the basic unit of life, all living organisms are made up of cells. Living component that is made up of macromolecule. The cell also contains cell organelles that perform the function of cells.
The two types of cells are prokaryotic cells and eukaryotic cells.
Living organisms are of two types, unicellular and multicellular. Unicellular organisms are made up of only a single cell. These organisms are bacteria, protest, and yeast.
Multicellular organisms are those which are made up of more than one cell. These animals are these organisms are animals, plants, etc. All animals are multicellular organisms which means are made up of more than one cell, only bacteria protest and East are some organisms that are unicellular.
Thus, some animals have single cells.
To learn more about cells, refer to the below link:
https://brainly.com/question/13635240
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Jose is sweating after winning his 100-meter race.
Answer: What is the question?
Explanation:
A sample of helium has an initial
temperature of 78° C. When the
temperature is lowered to 18,0° C, the
volume of helium becomes 285 mL,
What was the initial volume of the
helium in mL?
Answer:
3460 mL
Explanation:
We are given:
T(i) = 351 k T(f) = 289 k
V (i) = v mL V(f) = 285 mL
Using the gas equation:
PV = nRT
Since Pressure (P) , number of moles (n) and R is the universal gas constant
We can say that V/T = k (where k is a constant)
Hence, we can say that:
V(i) / T(i) = V(f) / T(f)
Replacing the values
v / 351 = 285 / 289
v = 3460 mL
If you have any doubt about this answer, feel free to comment
What is the volume of a piece of aluminum if the mass is 150g and the density.is 2.70 g/cm3
Answer:
The answer is
55.56 cm³Explanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\ [/tex]
From the question
mass of aluminum = 150 g
density = 2.7 g/cm³
The volume is
[tex]volume = \frac{150}{2.7} \\ = 55.5555555...[/tex]
We have the final answer as
55.56 cm³Hope this helps you
Formula: v = m/d
v = volume
m = mass
d = density
We are given the mass and density, so we can solve for the volume.
v = 150/2.7
v = 55.555...mL
Best of Luck!
How many moles are in 8.8 x 1024 atoms of magnesium?
Answer:
15 mol Mg
Explanation:
Step 1: Find conversions
Avagadro's Number: 6.022 × 10²³
Step 2: Use Dimensional Analysis
[tex]8.8(10)^{24} \hspace{3} atoms \hspace{3} Mg(\frac{1 \hspace{3} mol \hspace{3} Mg}{6.022(10)^{23} \hspace{3} atoms \hspace{3} Mg} )[/tex] = 14.6179 mol Mg
Step 3: Simplify
We have 2 sig figs.
14.6179 mol Mg ≈ 15 mol Mg
atomic weight of lithium ?
Answer:
6.941
Explanation:
97.2 kJ of heat is added to a 12.0 kg block or iron. what is the temperature change of the block?
Answer:
[tex]\Delta T=18.24\°C[/tex]
Explanation:
Hello,
In this case, since the equation for computing the heat in terms of mass, specific heat and temperature change is:
[tex]Q=mCp\Delta T[/tex]
For the given heat and mass, and considering the specific heat of iron to be 0.444 kJ/(kg°C), the resulting temperature change is:
[tex]\Delta T=\frac{Q}{mCp}=\frac{97.2kJ}{12.0kg*0.444\frac{kJ}{kg\°C}}\\ \\\Delta T=18.24\°C[/tex]
Best regards.
Which of the following are examples of sampling bias
Select all that apply,
A wildlife biologist measuring average deer size only chooses male deer,
which tend to be larger than female deer,
A plant ecologist wants to know which insects visit certain flowers,
but only samples in the morning around 10:00am.
A marine biologist studies coral reef populations, and samples the same
reef location every day because it has more fish,
A forest ecologist wants to study bird populations so she sets up an
observation station next to the office because it's convenient
A marine biologist uses tools to carefully collect a random sample of
anemones at regular intervals along a transect line
Answer:
the first and the third one.
Statements that serve as examples of sampling bias are:
A wildlife biologist measuring average deer size only chooses male deer, which tend to be larger than female deer.
A plant ecologist wants to know which insects visit certain flowers,but only samples in the morning around 10:00am.
A marine biologist studies coral reef populations, and samples the same
reef location every day because it has more fish.
A forest ecologist wants to study bird populations so she sets up an
observation station next to the office because it's convenient
Sampling bias can be regarded as a bias whereby a sample is collected, among these samples some members of the intended population will possess lower or higher sampling probability compare to others at the end. Biased sample of a population usually resulted when all individuals, or instances don't have selection.For instance, wildlife biologist that want to measure average deer size, he then choose the male only which is usually larger than the female, his sampling will result to sampling biasTherefore, option the last option is correct.
Learn more at:
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If a compound with a density of 9.0 g/cm^3 occupies 37.6 in^3, what is its mass in kg?
2.54 cm = 1 in
Answer:
V = m d = 14 830 g × 1 c m ³ 19.32 g = 767.6 cm³
Use the worked example above to help you solve this problem. An electrical heater is operated by applying a potential difference of 49.4 V to nichrome wire of total resistance 8.04 Ω. (a) Find the current carried by the wire and the power rating of the heater. I = 6.14 Correct: Your answer is correct. A P = 303.5 Correct: Your answer is correct. W (b) Using this heater, how long would it take to heat 2.10 103 moles of diatomic gas (e.g., a mixture of oxygen and nitrogen, or air) from a chilly 10°C to 25°C? Take the molar specific heat at constant volume of air to be 5 2 R. s (c) How many kilowatt-hours of electricity are used during the time calculated in part (b) and at what cost, at $0.14 per kilowatt-hour? U = kWh cost $ EXERCISEHINTS: GETTING STARTED | I'M STUCK! (a) A hot-water heater is rated at 4.69 103 W and operates at 2.40 102 V. Find the resistance in the heating element and the current. R = Ω I = A (b) How long does it take to heat 125 L of water from 25.6°C to 54.0°C, neglecting conduction and other losses? (The specific heat of water is 4.186 J/g · K.) s (c) How much does it cost at $0.14/kWh? $
Answer:
Part A:
a) Current = 6.14 A; Power = 303.5 W
b) time = 0.6 hours
c) cost = $ 0.025
Part 2:
a) Resistance = 12.28 ohms; Current = 19.54 A
b) time = 0.88 hours
c) cost = $0.578
Explanation:
The explanation is found in the attachments below:
