Answer:
the answer is c.
Explanation:
The number of moles of sodium chloride present in 0.5 L of 4 Molar NaCl(aq) is 2 moles. The correct option is a.
What are moles?Moles are the quantity or amount of any substance. It is a measurement quantity.
The concentration of NaCl is 4 molar
The volume of the solution is 0.5 L is given.
To calculate the number of moles, we use the formula of molarity, in which moles are divided by the volume of the given solution. The formula is:
Molarity = moles/ volume
4 M = moles / 0.5 L
Putting the values in the given formula:
Moles = 4 x 0.5 L = 2 moles
Thus, the correct option is a. 2 moles is the number of moles of sodium chloride.
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Convert from 1.56×1030 particles of sodium chloride (NaCl) to grams of sodium chloride.
Answer:
15.14×10⁷ g
Explanation:
Given data:
Number of particles of NaCl = 1.56×10³⁰ particles
Mass of sodium chloride = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ particles
1.56×10³⁰ particles × 1 mol / 6.022 × 10²³ particles
0.259 ×10⁷ mol
Mass in gram:
Mass = number of moles × molar mass
Mass = 0.259 ×10⁷ mol × 58.44 g/mol
Mass = 15.14×10⁷ g
13. As heat is added to a lúguid that is boiling at constant
pressure, the temperature of the liquid
A) decreases B) increases
C) remains the same
A
B
How many atoms of hydrogen would need to bond with a single atom of selenium to form a molecular compound?
Answer:
Hydrogen sulfide reacts with aqueous selenous acid to produce selenium disulfide:
H2SeO3 + 2 H2S → SeS2 + 3 H2O
Selenium disulfide consists of 8-membered rings. It has an approximate composition of SeS2, with individual rings varying in composition, such as Se4S4 and Se2S6. Selenium disulfide has been used in shampoo as an antidandruff agent, an inhibitor in polymer chemistry, a glass dye, and a reducing agent in fireworks.[15]
Selenium trioxide may be synthesized by dehydrating selenic acid, H2SeO4, which is itself produced by the oxidation of selenium dioxide with hydrogen peroxide:[17]
SeO2 + H2O2 → H2SeO4
Hot, concentrated selenic acid can react with gold to form gold(III) selenate.[18]
What would change oxygen into another isotope
Answer:
Adding Neutrons
General Formulas and Concepts:
Chemistry - Atomic Structure
Atoms CompositionNucleus - Protons, NeutronsElectronsExplanation:
We know that adding Protons to any atom will change its chemical properties and make it a different element.
We also know that adding Electrons to any atom will simply only change its overall charge.
Isotopes are formed by adding neutrons to the nucleus. It will be the same element but it would have a different mass and amount of neutrons.
Which of the following is an example of a physical change?
А.
sugar and oxygen reacting to produce water and carbon dioxide
B
honey dissolving in tea
С
a raw egg being cooked
D
metal rusting after being left out in the rain
Answer:
B. honey dissolving in tea
Explanation:
How much energy, in kilojoules, must you add to 3.00 quarts of olive oil to warm it from 23.0 °C to 100.0 °C? The specific heat of olive oil is 0.1.79 J/g·°C and its density is 0.916 g/mL
Answer:
3.58*10^-4kJ
Explanation:
Given
T1=23.0 °C
T2=100.0 °C
c=1.79 J/g·°C
Volume of olive =3 quarts
Converting to liter
1 quart =0.946353 L
3 quarts=x
Cross multiplying
x=0.946353*3
x=2.83L
To mL= 0.0028mL
We are given the density as 0.916 g/mL
Mass= density *volume
Mass= 0.916*0.0028
Mass=0.0026g
We know that the quantity of heat is expressed as
Q=mcΔT
Q=0.0026*1.79(23-100)
Q=0.004654*(77)
Q=0.358J
In kJ we divide 0.36 by 1000
=0.000358358
=3.58*10^-4kJ
The naturally occurring isotopes of potassium are potassium-39, potassium-40, and potassium-41. Potassium-39 has an abundance of 93.258% and a mass of 38.964 amu. Potassium-40 has an abundance of 0.011710% and a mass of 39.964 amu. Potassium-41 has an abundance of 6.7302% and a mass of 40.962 amu. Calculate the average atomic mass of potassium
Answer:
39.099 amu
Explanation:
saw this on quizlet no cap sorry im 3 weeks late
A covalent bond is formed by:
loss of electrons between atoms
sharing of electrons between atoms
gain of electrons between atoms
valence electron shells overlaping, forming a "sea of electrons"
Answer:
sharing of electrons between atoms
Ava threw a hamster at her sister the other day she used 12N of force to accelerate the hamster at 8m/s2.what was the mass of the poor hamster?SHOW ALL WORK
We are given:
The force applied on the poor hamster (F) = 12 N
Acceleration of the poor Hamster (a) = 8 m/s²
Solving for the mass of the Poor Hamster:
From newton's second equation of motion, we know that:
F = ma
replacing the given values
12 = 8 * m
m = 12/8 kg
m = 3/2 kg
The poor Hamster weighs 3/2 kg
How many atoms of fluorine are in 5.6x10^22 molecules of MgF2.
Answer:
1.12 x 10²³atoms of F
Explanation:
Number of MgF₂ atoms = 5.6 x 10²² molecules;
The unknown here is the number of Fluorine atoms found in the compound.
In MgF₂,
1 mole of MgF₂ contains 2 moles of F;
From the given number of molecules we can also say that, MgF₂ contains 5.6 x 10²²atoms;
1 mole of MgF₂ contains 2 moles of F;
5.6 x 10²²atoms of MgF₂ will contain 2 x 5.6 x 10²² = 1.12 x 10²³atoms of F
The number of atoms of Flourine found in 5.6x10^/²² molecules of MgF2 is; 1.12 x 10²³atoms of F
Number of MgF₂ atoms as given = 5.6 x 10²² molecules;
We are required to determine the number of Fluorine atoms found in the compound.
In MgF₂,
1 mole of MgF₂ contains 2 moles of F;As given, MgF₂ contains 5.6 x 10²²atoms;
1 mole of MgF₂ contains 2 moles of F;Hence, 5.6 x 10²²atoms of MgF₂ will contain 2 x 5.6 x 10²² = 1.12 x 10²³atoms of Flourine.
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Answering the following questions will help you focus on the outcomes of the experiments. Experiment 1: What happens to the water in the small tube as the water in the test tube absorbs heat? Why do you think a small tube was used to observe the expansion of water? Experiment 2: Compare the circumference of the balloon before and after freezing. What is the percent increase in this measurement? Combined Results Write a summary paragraph discussing this experiment and the results. Use the following questions and topics to help guide the content of your paragraph. Summarize the conclusions that you can draw from this experiment. Use the questions above to guide your ideas. Summarize any difficulties or problems you had in performing the experiment that might have affected the results. Describe how you might change the procedure to avoid these problems. Describe at least two real-world issues or examples that illustrate the findings of this experiment.
Answer:
Use a glass testtube
Insert a 1-hole stopper in which you insert a glass tube (use a bit of glycerine around the bottom end which makes it slip easier into the stopper)
Fill the testtube with colored water
Place rubber stopper
Make sure there are no air bubbles and that the column in the glass tube is low, as indicated
Place testtube assembly into water which you will heat (hot plate)
Observations
You will observe that the water column in the glass tube moves up as the temperature of the water in the testtube increases. With a 20 mL testtube, and a temperature change from 20 degrees C to 80 degrees C, you should get something like 15-20 cm of change in height.
What do YOU observe?
How do YOU explain your observation?
What is happening there?
Explanation
The water in the testtube expands as it is heated. There is only one direction to expand in, the glass tube. This glass tube is narrow so that a small change in volume will result in a considerable change in height; your signal is amplified.
This is the same phenomenon as in thermometers with a glass bulb on the lower end. Thermometers use a variety of liquids including alcohol (expands more than water) and mercury (is dangerous when spilled).
Explanation:
hope this helps
Answer:
Experiment 1:
What happens to the water in the small tube as the water in the test tube absorbs heat?
Answer: As the water in the test tube absorbs heat the water in the small tube continues to rise
Why do you think a small tube was used to observe the expansion of water?
Answer: The small tube was used to observe the expansion of water to show a visible change that could also be measure with a ruler
Experiment 2:
Compare the circumference of the balloon before and after freezing. What is the percent increase in this measurement?
Answer: The circumference of the balloon increased after it was put in the freezer. The measurement increased by about 5%, it started at 39.5cm then increased to 41.5cm
According to the data, an increase in temperature caused the water molecules to expand because it gained energy which caused it to move more rapidly ultimately resulting in an increase of volume of water. In addition, when being froze water expands making it less dense than the water from which it freezes, causing the volume to also increase. The difficulty I faced in this experiment is pinpointing the exact change in the waters expansion. Two real world issues are when icebergs float as a result of water freezing resulting in expansion, another one is the warming of Earth due to the heat-trapping from greenhouse gases. This heat is absorbed by oceans and seas causing the temperature to rise and the water to expand.
Explanation:
Why do you think some things float and some things sink?
Answer:
because some things have a higher density than other things
Explanation:
Answer:
some things float bc they have air inside of them which makes them rise bc air rises and gravity pulls so theyre working against each other. some things sink bc theyre heavy and gravity is already pulling them down so them being heavy just makes them sink faster. hope this helps!!!
Explanation:
If a liquid is said to have high viscosity it is...
Answer:
Viscosity is the measure of resistance of a fluid to flow. A fluid that is highly viscous has a high resistance (like having more friction) and flows slower than a low-viscosity fluid. To think of viscosity in everyday terms, the easier a fluid moves, the lower the viscosity
Explanation:
Lexi is balancing equations. She is finding one equation to be very difficult to balance. Which explains how to balance the equation ZnSO4 + Li2CO3 → ZnCO3 + Li2SO4?
Answer:
deez
Explanation:
thx
Answer:
Atoms in the equation are already in balance
Explanation:
It's D
Acetylene gas (C2H2) is used in welding torches. When it reacts with oxygen, it produces
carbon dioxide (CO2) and steam (H20). The reaction can be described by the equation 2C2H2+
502 —> 4CO2 + 2H20. How much mass of C2H2 is needed to produce 75.0 grams of CO2?
Mass C₂H₂ needed : 22.165 g
Further explanationReaction
2C₂H₂+ 5O₂ ⇒ 4CO₂ + 2H₂O
75.0 grams of CO₂ , mol CO₂ (MW=44 g/mol) :
[tex]\tt \dfrac{75}{44}=1.705[/tex]
mol C₂H₂ :
[tex]\tt \dfrac{2}{4}\times 1.705=0.8525[/tex]
mass C₂H₂ (MW=26 g/mol) :
[tex]\tt 0.8525\times 26=22.165~g[/tex]
When elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it. true or false
Answer:
True
Explanation:
Question 2
The higher the energy, the higher or lower the wavelength? This is an example of a/an direct or inverse relationship?
Answer:
the higher the energy tje lower the wavelength
Explanation:
inverse relationship
Answer:
It's an example of an inverse relationship :)
What is the Molarity of 25 g of C6H12O6 in 25 mL of H2O?
Answer:
5.6 M
Explanation:
Given data:
Mass of C₆H₁₂O₆ = 25 g
Volume of solution = 25 mL (25 mL×1 L/1000 mL=0.025 L)
Molarity of solution = ?
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
Number of moles of C₆H₁₂O₆:
Number of moles = mass/molar mass
Number of moles = 25 g/ 180.16 g/mol
Number of moles = 0.14 mol
Molarity:
M = number of moles / volume in L
M = 0.14 mol/ 0.025 L
M = 5.6 M
Help please! please answer with a good answer
Answer:
what the heck what is that?
Explanation:
Metal X is soft and can be cut with a knife. It reacts vigorously with air and water. Identify metal X-
iron
copper
Sodium
gold
Answer:
The metal is most likely Sodium.
Explanation:
Iron is not soft enough to be cut with a knife and will not react violently with water. When Iron reacts with water it just slowly rusts.
Copper is somewhat malleable, however, does not really react with water and only forms an oxide layer in the air.
Sodium is soft enough to be cut with a knife (I know this because I have worked with it and seen people work with it). It is also an alkali metal which are known to explode when in water.
Gold is malleable but does not really react with anything and is considered inert.
- Which particles are found in the nucleus of an argon
atom?
Answer:proton,neutrons,and electrons.
Explanation:
An electrochemical cell is composed of pure nickel and pure iron electrodes immersed in solutions of their divalent ions at room temperature (25°C). If the concentrations of Ni2+ and Fe2+ ions are 0.002 M and 0.40 M, respectively, what voltage is generated at 25°C? (The respective standard reduction potentials for Ni and Fe are −0.250 V and −0.440 V.)
Answer:
0.758 V.
Explanation:
Hello!
In this case, case when we include the effect of concentration on an electrochemical cell, we need to consider the Nerst equation at 25 °C:
[tex]E=E\°-\frac{0.0591}{n} log(Q)[/tex]
Whereas n stands for the number of moles of transferred electrons and Q the reaction quotient relating the concentration of the oxidized species over the concentration of the reduced species. In such a way, we can write the undergoing half-reactions in the cell, considering the iron's one is reversed because it has the most positive standard potential so it tends to reduction:
[tex]Fe^{2+}+2e^-\rightarrow Fe^0\ \ \ E\°=0.440V\\\\Ni^0\rightarrow Ni^{2+}+2e^-\ \ \ E\°=-0.250V[/tex]
It means that the concentration of the oxidized species is 0.002 M (that of nickel), that of the reduced species is 0.40 M and there are two moles of transferred electrons; therefore, the generated potential turns out:
[tex]E=(0.440V+0.250V)-\frac{0.0591}{2} log(\frac{0.002M}{0.40M} )\\\\E=0.758V[/tex]
Beat regards!
What is percent error calculation used to determine
A 0.4505 g sample of a pure soluble bromide compound is dissolved in water, and all of the bromide ion is precipitated as AgBr by the addition of an excess of silver nitrate. The mass of the resulting AgBr is found to be 0.7514 g. What is the mass percentage of bromine in the original compound
Answer:
70.98% is the mass percentage of bromine in the original compound
Explanation:
First, we need to convert mass of AgBr to moles with its molar mass (AgBr: 187.77g/mol). Moles of AgBr = Moles of Br. With molar mass of Br-: 79.904g/mol we can find mass of bromide and mass percentage as follows:
0.7514g AgBr * (1mol / 187.77g) = 0.00400 moles AgBr = Moles of Br-
0.00400 moles Br- * (79.904g / mol) = 0.320g Br- in the sample
Mass percentage is:
0.320g Br- / 0.4505g sample * 100
70.98% is the mass percentage of bromine in the original compoundQuestion 1 Give the correct number of significant figures for 4500, 4500., 0.0032, 0.04050
Question 2 Give the answer to the correct number of significant figures:
4503 + 34.90 + 550 = ?
the correct number of significant figures.
uction 2 Give
Answer:
Question 2
5087.9 or 5088
Sodium sulfate solution contains sodium lons, Na+, sulfate ions, (SO4)2-, hydrogen ions, H+, and hydroxide ions, OH-.
When sodium sulfate is electrolyzed, hydrogen is produced at one electrode and oxygen is produced at the other electrode.
Explain how these products are formed from the ions in the electrolysis process, indicating how you would identify the products.
(6 marks)
Water is oxidized and reduced at both electrodes
Further explanationElectrolysis utilizes electrical energy to carry out non-spontaneous redox reactions. The ions in the solution flowed by an electric current will move toward the electrode opposite the charge.
The negative ions from the solution will move towards the positive electrode, and release electrons around the positive electrode (oxidation occurs) and electrons flow to the negative pole
While around the negative electrode electron binding occurs and a reduction reaction occurs
the reaction at the cathode:
1. the reduced active metal is water, other than that the metal will be reduced
2. H⁺ of the acid will be reduced
For reactions in anode:
1. if the electrodes are not inert then the metal is oxidized
2. If inert then:
a. OH⁻ from the base will be oxidized
b. The halogen metal will oxidize
Na⁺ (cathode)⇒metal group 1 and 2 ⇒ H₂O reduced2H₂O(l)+2e⁻⇒ H₂(g)+2OH⁻(aq)
SO₄²⁻ (anode)⇒acid ion(oxyacid)⇒H₂O oxidized2H₂O(l)⇒4H⁺(aq)+O₂(g)+4e⁻
If 8.2 mL of 0.055 M NaOH is required to titrate a 5.5 mL sample of potassium bitartrate, what is the [K +]?
Answer:
.082 M
Explanation:
You just do C1V1=C2V2
The concentration of the potassium bitartrate acid is determined as 0.082 M.
Concentration of the acidThe concentration of the potassium bitartrate acid is calculated as follows;
C1V1 = C2V2
where;
C1 is the concentration of the base = 0.055V1 is the volume of the base = 8.2 mlC2 is the concentration of the acidV2 is the volume of the acid = 5.5 mlC2 = (C1V1)/(V2)
C2 = (0.055 x 8.2)/(5.5)
C2 = 0.082
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1. At room temperature, air is usually a (solid, liquid, gas).
The reference point in motion is:
A. The point in space and time at which the motion ended
B. The point in space and time at which the motion began
C. The focal point
D. The origin
Answer: the focal point
Name the two ways by which
suspended impurities present
in water can be removed
Answer:
Common water treatment processes such as flocculation, sedimentation, filtration and disinfection are employed to remove general impurities such as floating and suspended matters, colloidal particles, dissolved organic matter and destruction of disease-causing microorganisms (pathogens).
Explanation: