If a cell is placed in an isotonic solution, there will be no net flow of water into or out of the cell, and the cell's volume will remain stable. If the solute concentration outside the cell is the same as inside the cell, and the solutes cannot cross the membrane, then that solution is isotonic to the cell.
What are the complete Ionic and Net Ionic equations for the following
a) CaCl2(aq) + Pb(NO3)2(aq) → PbCl2(s) + Ca(NO3)2(aq)
b) CaCl2(aq) + Na2CO3(aq) → CaCO3(s) + 2NaCl2(aq)
c) 2AgNO3 (aq) + BaI2(aq) → Ba(NO3)2 (aq) + 2AgI (s)
Answer:
Check photo
Explanation:
9. Which of these is not a mixture? *
Solution
Alloy
Amalgam
They are all mixtures.
Answer:
They are all mixture
Explanation:
last option
water vapour is the solid form of water.
True
False
Answer and I will give you brainiliest
Answer:
False
Explanation:
Water vapour exists in gas phase!
what is the empirical formula of A compound is found to contain 39.12 % carbon, 8.772 % hydrogen, and 52.11 % oxygen by mass.
Answer:
C₃H₈O₃
Explanation:
Let's assume we have 100 g of said compound. Then we would have:
39.12 g of C8.772 g of H52.11 g of ONow we convert those masses into moles, using their respective atomic weights:
C ⇒ 39.12 g ÷ 12 g/mol = 3.26 mol CH ⇒ 8.722 g ÷ 1 g/mol = 8.722 mol HO ⇒ 52.11 g ÷ 16 g/mol = 3.26 mol OThen we divide those moles by the smallest number among them:
C ⇒ 3.26 mol C / 3.26 = 1H ⇒ 8.722 mol H / 3.26 = 2.68O ⇒ 3.26 mol O / 3.26 = 1Finally we multiply those numbers by 3, so as to convert the 2.68 of H into an integer:
C ⇒ 1 * 3 = 3H ⇒ 2.68 * 3 = 8O ⇒ 1 * 3 = 3Thus the empirical formula is C₃H₈O₃
What is the molecular formula for a compound with a molar mass of 42.08g/mol and an empirical formula of ch2
Answer:
[tex]C_3H_6[/tex]
Explanation:
Hello!
In this case, since the empirical formula is the smallest representation of the molecular formula, it is known that the times in which the empirical formula is into the molecular formula is a whole number and is computed by dividing the molar mass of the molecular formula by that of the empirical formula as shown below:
[tex]\frac{42.08g/mol}{12.01+1.01x2}= \frac{42.08g/mol}{14.03g/mol}=3[/tex]
Thus, the molecular formula times the empirical formula by 3 to obtain:
[tex]C_3H_6[/tex]
Regards!
A 2.26 M solution of KOH is prepared. Calculate the moles and mass of solute present in a 15.2-mL sample of this solution. The molar mass of KOH is 56.11 g/mol.
Answer:
0.0344 moles and 1.93g.
Explanation:
Molarity is defined as the ratio between moles of a solute (In this case, KOH), and the volume. With molarity and volume we can solve the moles of solute. With moles of solute we can find mass of the solute as follows:
Moles KOH:
15.2mL = 0.0152L * (2.26mol / L) = 0.0344moles
Mass KOH:
0.0344 moles * (56.11g/mol) = 1.93g of KOH
How can you use density to separate mixtures like sand and small plastic pellets?
Answer:
Slide a magnet through the mixture. When you take the magnet off, the iron filings are going to be attracted to the magnet and the sand will stay in the bowl
Explanation:
Answer:
Density can be used to separate the substances that make up a mixture, because each substance in a mixture has its own density. For example, if a mixture of sand and oil is placed in water, the sand will sink to the bottom of the container. The sand is more dense than the water.
Explanation:
Please mark me as brainy if this helps
A chemist prepares a solution of barium acetate BaCH3CO22 by weighing out 52.9g of barium acetate into a 100.mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in /gL of the chemist's barium acetate solution. Round your answer to 3 significant digits.
Answer:
529g/L
Explanation:
The concentration in chemistry is defined as the amount of solute in a determined amount of solution. The concentration in g/L means the amount of grams of solute (In this case, barium acetate), per liter of solution.
To solve this problem we need to find grams of solute (52.9g, already given) and the volume in liters (Converting 100mL to liters):
Volume:
100mL * (1L / 1000mL) = 0.100L
And concentration in g/L is:
52.9g / 0.100L =
529g/LAll the radioactive elements are found in the last group of the Periodic Table.
True
False
Answer:
False
Explanation:
Identify 3 characteristics that would be taken into consideration when evaluating any proposed site for a national repository of nuclear waste.
Answer:
Proximity to water bed/water sourceGeographical isolation and barriersunavailability of plant or any biosystemExplanation:
A nuclear repository would be required to be isolated with barriers in place to keep people out. Ideally, it should be stored underground and away from any underlying waterways, or biosystems so as to avoid contamination. A good example would be the proposed Yucca Mountain repository.
I hope this was helpful and useful.
The radioactive substance has a lot of distinction and variation and needs to be kept aside from the environment and it of reach for most nuclear power plants to discharge the gases.
There is various consideration that needs to keep in mind such as the size of the container, temperature of the gas, and amount of gas in the container. Other considerations include the closeness to water bed/water source, the locational isolation, and barriers , unavailability of plant or any biosystem in case of the nuclear wastes.Learn more about the characteristics that would be taken into consideration.
brainly.com/question/5562285.
two reason that show sugar is compound
Answer:
Table sugar, or sucrose, is a compound because it's formed when two or more elements are joined together. Its chemical formula is C12H22O11, and it contains carbon, hydrogen and oxygen. More specifically, each molecule of sugar has 12 carbon atoms, 22 hydrogen atoms and 11 oxygen atoms.
Explanation:
hope this helps
And electro chemical cell has the following standard cell notation:
Mg(s) | Mg2+ (aq) || Ag+(aq)| Ag(s)
Write a balanced redox reaction for the cells using the oxidation and reduction half reactions. (be sure to equalize charge by multiplying the correct number before adding and simplifying)
2Ag⁺(aq) + Mg(s)→ 2Ag(s) + Mg²⁺ (aq)
Further explanationGiven
Standard cell notation:
Mg(s) | Mg2+ (aq) || Ag+(aq)| Ag(s)
Required
a balanced redox reaction
Solution
At the cathode the reduction reaction occurs, the anode oxidation reaction occurs
In reaction:
Ag⁺ + Mg → Ag + Mg²⁺
half-reactions
at the cathode (reduction reaction)Ag⁺ (aq) + e⁻ ---> Ag (s) x2
2Ag⁺ (aq) + 2e⁻ ---> 2Ag (s)
at the anode (oxidation reaction)Mg (s) → Mg²⁺ (aq) + 2e−
a balanced cell reaction
2Ag⁺(aq) + Mg(s)→ 2Ag(s) + Mg²⁺ (aq)
Answer:2Ag⁺(aq) + Mg(s)→ 2Ag(s) + Mg²⁺ (aq)
Explanation:
just took test
if 3.26 g is dissolved in enough water to make exactly 323 ml of solution, what is the molar cocentration of nitrate ion g
GIVING OUT BRAINLIEST!!!!!!!!!
Which substance has the lowest specific heat?
O Beach sand
O
Beach water
O Ice
Pool water
Using the diagram above, answer the following questions:
6. True or False. The arrow labeled C represents a transfer of chemical energy to mechanical energy. Explain why this is true or false. –
7. True or False. The arrow labeled A represents a transfer of solar energy to chemical energy. Explain why this is true or false. –
8. Which arrow or arrows represent a release of carbon dioxide? What process is occurring at the arrow(s) you selected?
9. Which arrow or arrows indicate a process that cycles carbon from living or nonliving organisms? Describe the process or processes you selected.
10. Which arrow or arrows represent reactions that demonstrate a conservation of mass and energy? Explain your answer.
PLEASE HELP!
Answer:
6. false.
chemical energy to heat and mechanical. Mechanical that runs the factory in the photo, and Heat energy that rises up in the atmosphere to join the other carbon
molecules in the air. 7. True. The arrow letter A is the transfer of solar power
from the sun, to a chemical reaction to produce food for the plant, which is
called photosynthesis. The leaves in the plant has chlorophyll that absorbs light
energy and transforms it to food.8. The answer would be letter C and F. C because It is
during the burning of the fossil fuels that the carbon dioxide is release into
the atmosphere. When burning the fossil fuels the carbon that was inside the
fossils is released. This also happens with diesel and other forms of natural
gas. While, F is because plant
respiration releases some of the carbon remains of the photosynthesis. While
plants do absorb carbon dioxide, part of their end product also includes reformed
carbon dioxide. Most of the other processes in the phot uses carbon or absorbs
carbon dioxide to aid their sustenance.9. A carbon cycle for living things would be A or B to F
wherein the plants absorb carbon dioxide to aid their production of food, and
then releasing carbon dioxide again as a by product of their food production.
This also happen to aquatic plants.An example of a non-living carbon cycle would be, D or E to
C. This would be the absorption of the carbon on our sea waters or to our soil,
this then gets trapped in there until it is release like through the forms of
fossil fuel burning.10. The law of conservation of mass and energy states that
matter can neither be created nor destroyed, this is very much evident in the
carbon cycle. Because the carbon from the light energy from the sun, or in our
atmosphere, ends up back to our atmosphere just to continue its cycle. The fact
that the carbon cycle is a cycle not just a linear equation proves that energy
can neither be created nor destroyed.
Explanation:
I need a answer ASAP
Answer:
3.2 millions years oldExplanation:
i hope it helps :)
Why is your body going through physical and chemical changes?
Answer:
Physical and chemical changes can occur almost everywhere, even in our bodies! Food must be broken down into a form that our cells can use. When we eat, our bodies physically break down food into small pieces. Our bodies also chemically break down those small pieces of food into tiny organic molecules.
Explanation:
What carpet Burns in a deficiency of O2 a mixture of CO and CO2 forms.Carbon Burns in excess O2 to form only CO2 and CO Burns in excess O2 to form only CO2. Calculate ΔH for C(graphite +1/2O2) →CO(g).
Answer:
Explanation:
From the combustion of carbon, the reactions occurring in limited oxygen conditions are:
[tex]C(graphite) + \dfrac{1}{2}O_{2(g)} \to CO_{(g)}[/tex]
[tex]C(graphite) + O_{2(g)} \to CO_{2(g)}[/tex]
If it occurs in excess, then any leftover CO changes to CO2. i.e.
[tex]C(graphite) + O_{2(g)} \to CO_{2(g)}[/tex] ---- (1)
[tex]CO_{(g)} + \dfrac{1}{2}O_{(g)} \to CO_{2(g)}[/tex] ----- (2)
From (1), the enthalpy change is:
[tex]\Delta H_{rxn1} = \Delta H^0_{fCO_2(g)} - ( \Delta H^0_{f C(graphite)}+ \Delta H^0_{fCO_2(g)}[/tex]
[tex]\Delta H_{rxn1} =-393.5 \ kJ/mol -(0+0)[/tex]
[tex]\Delta H_{rxn1} =-393.5 \ kJ/mol[/tex]
From (2), the enthalpy change is:
[tex]\Delta_{rxn2} = \Delta H^0_{fCO_2(g)} - ( \Delta H^0_{fCO(g)} + \dfrac{1}{2} \Delta H^0_{fO_2(g)})[/tex]
[tex]\Delta_{rxn2} = -393.5 \ kJ/mol -(-110.5 + \dfrac{1}{2}(0))[/tex]
[tex]\Delta_{rxn2} = -283.0 \ kJ/mol[/tex]
Subtracting (2) from (1), we get:
[tex]C(graphite) + O_{2(g)} \to CO_{2(g)} \ \ \ \Delta H_{rxn} = -393.5 \ kJ/mol}[/tex]
[tex]CO_{(g)} + \dfrac{1}{2} O_2(g) \to CO_{2(g)}} \ \ \ \Delta H _{rxn2} = -283.0 \ kJ/mol[/tex]
[tex]C(graphite) + O_{2(g)} \to CO (g) + \dfrac{1}{2}O_{2(g)} \ \ \ \Delta H_{rxn} = -110.5 \ kJ/mol[/tex]
[tex]C(graphite) + \dfrac{1}{2} O_{2(g)} \to CO (g) \ \ \ \Delta H_{rxn} = -110.5 \ kJ/mol[/tex]
The enthalpy change ΔH of the reaction = -110.5 kJ/mol
How do sound waves travel? PLEASE HELP IF YOU WANT BRAINLEIST AND ME TO LIKE URE COMMENT!!
A. Sound causes the air near it to vibrate inwards.
B. waves radiate outward from a central point.
C. Sound moves randomly in different directions.
D. Sound transforms waves into different frequencies.
The answer is A. The vibration caused by the waves through the air eventually weaken, which is why sound diminishes easily over distance.
what is the volume of the rock? if the water rose from 50L to 70mL
bill nye chemical reactions:
the picture looks cut off but can someone please help!
Answer:
. A(n) _______________________________ is matter that is composed of 2 or more different kinds of atoms.
2. A chemical reaction in which energy is released/given off is _____________________________________.
3. A(n) _________________________________ is a process in which substances are changed into other
substances.
4. Matter that is composed of only 1 kind of atom is a(n) ______________________________.
5. ___________________ is the ability to do work and/or transfer heat.
6. A chemical reaction in which energy is absorbed/taken in is _______________________________.
Knew/New
Write down 3 things you already knew about chemical reactions that were confirmed through watching the
video:
1.
2.
3.
Write down 3 new things that you learned from watching the video:
1.
2.
3.
Episode Guide
1. Chemicals can react to form new _________________________________.
2. Chemical reactions happen when ____________________ hook together.
3. Energy is given off during a chemical reaction because ____________________ are combining with other
__________________________.
4. During the "Try this" experiment, we see the students using vinegar and salt to clean old copper pennies.
The copper gets stripped away and the pennies look new again. Explain why you think this happens.
__________________________________________________________________________________________
Answer Key
compound
exothermic
chemical reaction
element
Energy
endothermic
Answers will vary.
Answers will vary.
chemicals
electrons
electrons
electrons
Copper atoms in the penny react with oxygen atoms from the air & together they form copper oxide which
makes the pennies look dull and dirty. The copper oxide dissolves in a weak acid (the vinegar & salt).
5. When vinegar and baking soda react together, the new substance that is produced is ___________________.
6. _______________ & ______________ are both dangerous by themselves, but when they react together they
form table salt.
7. Pyrotechnician is a name given to people who work to create _________________________.
8. In another experiment, we see kids blow up a balloon by mixing together vinegar and baking soda. When
the kids touch the blown up balloon, it is ____________ to the touch. This means that the reaction is
endothermic or exothermic
9. When someone gets hurt playing sports, often times a cold pack is used for the injury. The cold pack takes
up more energy than it gives off and it gets very ___________ to the touch. This means that the reaction taking
place is endothermic or exothermic
10. How do you know baking a cake is a chemical reaction? ________________________________________
11. There are ___________ naturally occurring elements.
12. If elements are in the same group on the periodic table, what does that tell you? ______________________
__________________________________________________________________________________________
True or False
1. When something burns, heat & light are given off. T or F
2. Your stomach growling is an example of a chemical reaction. T or F
3. Water is 1 part hydrogen and 2 parts oxygen. T or F
4. When baking a cake, a chemical reaction takes place. T or F
5. Everything is made of chemicals. T or F
6. Alfred Nobel invented dynamite. T or F
7. You should always wear safety goggles when working with chemicals. T or F
8. Sodium chloride is better known as sugar. T or F
9. A substance can feel a little warm if the reaction is endothermic. T or F
10. When developing film, red light doesn't affect the picture. T or F
11. A cold pack gets cold because the reaction takes more energy than it gives off. T or F
12. If chemicals behave similarly, they are grouped together on the periodic table. T or F
13. Chemical reactions happen when protons link atoms together. T or F
14. When vinegar and baking soda react, oxygen is produced. T or F
15. Fireworks are not an example of chemical reactions. T or F
carbon dioxide
Sodium chlorine
fireworks
warm
cold
The ingredients (flour, milk, eggs, etc.) are changed
Explanation:
What would you use to determine whether an acid or alkali has been added to a solution?
A. Reactant
B. Indicator
C. Adjustor
D. Identifier
Answer:
B. Indicator
Explanation:
An indicator is used to determine whether an acid or alkali has been added to a solution.
An acid or alkali changes the hydrogen ion concentration in solution. This is indicated by the pH of the solution after which the acid or alkali has been added.
To see this change, indicators are used. An indicator employs color changes to show a change in chemical properties which pertains to the pH. There are several indicators used which are litmus paper, phenolphthalein, methyl orangewhat is fractional distillation what is fractional distillation explain it with the help of an activity
Answer:
Fractional distillation is a method for separating liquids with different boiling points. For example, liquid ethanol can be separated from a mixture of ethanol and water by fractional distillation. ... The boiling point of ethanol is 78°C and the boiling point of water is 100°C.
How many protons, neutrons, and electrons does k^1+ have
Answer:
protons 19
nuetorns 20
electrons 19
metling point 63.65 C
Explanation:
How many pounds of gold ore would need to be processed to obtain 5 grams of gold (Au) if the ore is 0.1% gold by mass?
Pounds of gold ore : 11,02311
Further explanationGiven
5 g of gold
0.1% gold by mass
Required
Pounds of gold ore
Solution
[tex]\tt \%mass~gold=\dfrac{mass~gold}{mass~ore}\times 100\%[/tex]
For percent mass = 0.1%, than mass of gold ore :
[tex]\tt 0.1\%=\dfrac{5~g}{mass~ore}\times 100\%\\\\mass~ore=\dfrac{5\times 100}{0.1}\\\\mass~ore=5000~g[/tex]
Conversion factor :
1 g = 0,00220462 pound, than for 5000 g = 11,02311 pounds
help please thank you
18.0 mL of water contains 6.022 x 1023 water molecules. How many hydrogen atoms are in 1.00 L of water? (Each water molecule, H2O, contains two hydrogen atoms.)
Solution :
lt is given that in 18 mL of water their are [tex]6.022\times 10^{23}[/tex] water molecules.
We know, that 1 molecule of water contains 2 atoms of hydrogen.
Hydrogen atom in 18 mL water is,
[tex]2\times 6.022\times 10^{23} = 12.044 \times 10^{23}[/tex] .
So, number of hydrogen atoms in 1 L = 1000 mL are :
[tex]N = \dfrac{1000}{18}\times 12.044\times 10^{23}\\\\N = 6.69 \times 10^{25}\ atoms[/tex]
Hence, this is the required solution.
What is the wavelength of light emitted when the electron in a hydrogen atom undergoes transition from an energy level with n = 4 to an energy level with n = 2?
Answer:
[tex]4.86\times10^{-7}\ \text{m}[/tex]
Explanation:
R = Rydberg constant = [tex]1.09677583\times 10^7\ \text{m}^{-1}[/tex]
[tex]n_1[/tex] = Principal quantum number of an energy level = 2
[tex]n_2[/tex] = Principal quantum number of an energy level for the atomic electron transition = 4
Wavelength is given by the Rydberg formula
[tex]\lambda^{-1}=R\left(\dfrac{1}{n_1^2}-\dfrac{1}{n_2^2}\right)\\\Rightarrow \lambda^{-1}=1.09677583\times 10^7\left(\dfrac{1}{2^2}-\dfrac{1}{4^2}\right)\\\Rightarrow \lambda=\left(1.09677583\times 10^7\left(\dfrac{1}{2^2}-\dfrac{1}{4^2}\right)\right)^{-1}\\\Rightarrow \lambda=4.86\times10^{-7}\ \text{m}[/tex]
The wavelength of the light emitted is [tex]4.86\times10^{-7}\ \text{m}[/tex].
Do earthquakes occur at convergent plate boundaries?
Yes or no?
Answer:yes
Explanation:
What is the molarity of a solution of 10% by mass cadmium sulfate, CdSO4 (molar mass = 208.46 g/mol) by mass? The density of the solution is 1.10 g/mL.
a. 0.528 M
b. 0.436 M
c. 0.479 M
d. 0.048 M
e. 22.9 M
Answer:
a. 0.528 M .
Explanation:
Hello!
In this case, since the given by-mass percent can be written as:
[tex]\frac{10gCdSO_4}{100g\ sol}[/tex]
By using the density and molar mass of the solute, cadmium sulfate, we can compute the molarity, by also making sure we convert from mL to L of solution:
[tex]M=\frac{10gCdSO_4}{100g\ sol}*\frac{1molCdSO_4}{208.46gCdSO_4} *\frac{1.10g\ sol}{1mL\ sol}*\frac{1000mL}{1L} \\\\ M=0.528M[/tex]
Thereby, the answer is a. 0.528 M .
Best regards.
The molarity of the solution of 10% by mass cadmium sulfate [tex](CdSO_4)[/tex] is approximately 0.479 M. The correct option is C.
To calculate molarity we need to find out how many moles of CdSO4 are present in the solution.
Given:
Mass of [tex]CdSO_4[/tex]= 10% by mass of the solutionMolar mass of [tex]CdSO_4[/tex] = 208.46 g/molDensity of the solution = 1.10 g/mLWe need to calculate the mass of [tex]CdSO_4[/tex]:
Mass of [tex]CdSO_4[/tex] = (10% / 100%) * Total mass of the solution
Mass of [tex]CdSO_4[/tex] = (10 / 100) * 1000 g (since the volume is 1 L, and the density is 1.10 g/mL)
Mass of [tex]CdSO_4[/tex] = 100 g
So, the number of moles of CdSO4:
Number of moles of [tex]CdSO_4[/tex] = Mass of CdSO4 / Molar mass of CdSO4
Number of moles of [tex]CdSO_4[/tex] = 100 g / 208.46 g/mol
Number of moles of [tex]CdSO_4[/tex] ≈ 0.479 moles
Then, we calculate the molarity of the solution:
Molarity = Number of moles of CdSO4 / Volume of the solution (in liters)
Molarity = 0.479 moles / 1 L
Molarity ≈ 0.479 M
Hence, the molarity of the solution of 10% by mass cadmium sulfate [tex](CdSO_4)[/tex] is approximately 0.479 M. The correct option is C.
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