Answer:
bone loss and muscle deterioration
Explanation:
this helps the body keep thriving and bones strong and muscles in tact
Which of the following best expresses the definition of a closed system? (2 points) Energy can enter or leave the system but matter cannot. Heat and matter are both able to enter or leave the system. Matter can enter or leave the system but energy cannot. Heat and matter can enter the system but cannot leave the system.
the particle picture is best described as...
an element
an atom
a compound
a pure substance
both a pure substance and a compound
Answer:
Both are pure substances and a compound
1. A solution was made by dissolving 0.837g of Ba(OH)2 in 100 mL of solution. What is the pOH and pH of the solution?
2. What is the percentage ionization of 1.0M acetic acid? What is the pH of this solution?
Answer:
1. pOH = 1.01 and the pH = 12.99.
2. a) %I = 0.417 %, b) pH = 2.34.
Explanation:
1. The pH of the dissolution of Ba(OH)₂ in water can be calculated using the following equation:
[tex]pH = 14 - pOH = 14 - (-log[OH^{-}]) = 14 + log[OH^{-}][/tex]
To find the pOH, first, we need to calculate the concentration (C) of Ba(OH)₂:
[tex] C_{Ba(OH)_{2}} = \frac{\eta}{V} = \frac{m}{M*V} [/tex]
Where:
η: is the number of moles of Ba(OH)₂
V: is the volume of the solution = 100 ml = 0.100 L
M: is the molar mass of Ba(OH)₂ = 171.34 g/mol
m: is the mass of Ba(OH)₂ = 0.837 g
[tex] C_{Ba(OH)_{2}} = \frac{m}{M*V} = \frac{0.837 g}{171.34 g/mol*0.100 L} = 0.049 mol/L [/tex]
Knowing that in 1 mol of Ba(OH)₂ we have two moles of OH⁻, the concentration of OH⁻ is:
[tex] C_{OH^{-}} = \frac{2*\eta_{Ba(OH)_{2}}}{V} = 2*C_{Ba(OH)_{2}} = 2*0.049 mol/L = 0.098 mol/L [/tex]
Now, we can find the pOH and the pH of the solution:
[tex] pOH = -log[OH^{-}] = -log(0.098) = 1.01 [/tex]
[tex] pH = 14 - pOH = 14 - 1.01 = 12.99 [/tex]
2. a) The percentage of ionization (% I) of acetic acid can be calculated using the following equation:
[tex]\% I = \frac{[H^{+}]_{eq}}{[HA]_{0}}*100[/tex]
We need to find the [H⁺] = [H₃O⁺] at the equilibrium:
CH₃COOH(aq) + H₂O(l) → CH₃COO⁻(aq) + H₃O⁺(aq)
1.0 - x x x
[tex] Ka = \frac{[CH_{3}COO^{-}]*[H_{3}O^{+}]}{[CH_{3}COOH]} [/tex]
Ka: is the dissociation constant of acetic acid = 1.75x10⁻⁵
[tex] 1.75\cdot 10^{-5} = \frac{x^{2}}{1.0 - x} [/tex]
[tex] 1.75\cdot 10^{-5}(1.0 - x) - x^{2} = 0 [/tex] (1)
By solving equation (1) for x we have two solutions:
x₁ = -0.00417
x₂ = 0.00417 = [H₃O⁺] = [CH₃COO⁻]
We will take the positive value to find the percentage ionization:
[tex]\% I = \frac{[H^{+}]_{eq}}{[HA]_{0}}*100 = \frac{0.00417 M}{1.0 M}*100 = 0.417 \%[/tex]
b) The pH of the solution is:
[tex] pH = -log([H_{3}O^{+}]) = -log(0.00417) = 2.34 [/tex]
I hope it helps you!
List some common liquids that you think are acidic or basic. For example, do you think orange juice is acid or base? Why do you think each liquid is an acid or base?
It is best to say that electric motors require _______ to work. a. a continuous current b. a galvonometer c. a generator d. energy
What are the two major political parties in the United States, now?
Democrats and Republicans
In the hydrolysis of ethyl ethanoate, what will happen when the reaction is catalysed by an alkali?
Answer:
That is exactly what happens when esters are hydrolysed by water or by dilute acids such as dilute hydrochloric acid. The alkaline hydrolysis of esters actually involves reaction with hydroxide ions, but the overall result is so similar that it is lumped together with the other two.
Explanation:
Data
Record your data either in your lab notebook or in the space below.
Time
Radioactive Atoms
0.5"
Half-Life
Minutes
Predicted
Simulated
Cycles, n
Acted out
0.0
100
Initial = 0
100
1
100
0.5
1
2.
1.0
1.5
3
2.0
4
2.5
5
3.0
6
3.5
7
4.0
8
id
Answer:
The 2nd one
Explanation: U answered yourself on the second one
Answer: I don't have the last column though.
Explanation:
7. As the temperature of a fixed volume of a gas increases, the pressure will
Ovary inversely
O increase
O decrease
O not change
Answer:
increase
Explanation:
Please see the step by step explaination in the pictured attached below.
5 uL of a solution is equal to
how many nanoliters?
Answer:
5000 nL
Explanation:
Answer: 5000 nL
Explanation:
help please place the ph test papers I️n order from most acidic to most alkaline
Answer:refer to the image below
What might happen if an octopus we're chased by a predator
Answer:
They will try to defend themselves
Explanation:
Answer:
octopuses will shoot a dark liquid, sometimes called ink, at the thing that scared them. ... If an octopus does get caught — no problem. They can lose arms and regrow them.
Explanation:
What might happen if you got too close to the center of the Milky Way galaxy?
AYou would be burned up by the galaxy's brightest stars. incorrect answer
BYou would be spun outwards toward the edge of the galaxy. incorrect answer
CYou would be trapped in the gravitational pull of a black hole. incorrect answer
DYou would find yourself traveling faster than the speed of light.
Answer:
you would be trapped in the gravitational pull of a black hole
Explanation:
there is a black hole in the center of the galacy
what kind of nuclear reaction is seen in the picture above? A.Nuclear Fission
B.Alpha Decay
C.Nuclear Fusion
D.Beta Decay
PLEASE ANSWER ASAP
Answer: Nuclear Fission
Answer:
Beta Decay
Explanation:
PLEASE HELP!
The element (AI) is outlined in red on the periodic table.
Which period number is aluminum?
Which group number is aluminum in?
Answer:
period 3 and group 3
Explanation:
I'm saying group 3 because that is how I learnt it at school, but if you count it then it's in group 13.
Balance the following reaction CS2+Cl2. CCl4+S2Cl2
Answer:
CS₂ + 3Cl₂ ⇒ CCl₄ + S₂Cl₂
Explanation:
This one is relatively simple. When we take inventory of both sides, we see 1 Carbon, 2 Sulfurs, and 2 Chlorines on the reactant side, and 1 Carbon, 2 Sulfurs, and 6 Chlorines on the product side. Since we have Cl₂ on the left and we want 6 on the left, let's add a coefficient of 3 to Cl₂. This balances everything out! Final answer: CS₂ + 3Cl₂ ⇒ CCl₄ + S₂Cl₂. Hope this helps!
Which ion H₃O⁺ or OH⁻, is in greater concentration?
Answer:
The OH- ion concentration is greater than the H3O+ ion concentration.
Explanation:
To build a sustainable multigenerational
civilization, it may be necessary to simulate
Earth's gravity. How will this be possible?
Simulating Earth's gravity in space would be challenging, but it is possible to create artificial gravity using centrifugal force. Centrifugal force is the outward force experienced by an object that is moving in a circle.
What is gravity?An unobservable force that draws things together. Anyone remains on the ground thanks to Earth's gravity, which also causes objects to fall.
One way to create artificial gravity in space is by building a rotating space station. The station would consist of two main parts: a central hub and a rotating section.
The hub would contain the crew quarters, life support systems, and other essential components, while the rotating section would be attached to the hub via a set of cables or other structures.
The rotating section would be set spinning, creating centrifugal force that would push the crew towards the outer rim of the section. This force would create a sensation of gravity that would be similar to that experienced on Earth.
Thus, by rotating a spacecraft, it is possible to create a centrifugal force that mimics the gravitational force of Earth.
To learn more about the gravity, follow the link:
https://brainly.com/question/31321801
#SPJ2
Which statements describe an ideal gas
Answer:smoke
Explanation:smoke is a gas
example of a neutral mutation?
a frog born with white skin
a person's inability to break down sugar
a red flower with one part colored yellow
The answer is D
Explanation: A RED FLOWER WITH ONE PART COLORED YELLOW
Answer:
D.a red flower with one part colored yellow
Explanation:
edg2020
5. Do you think oppositional or symbiotic relationships are more beneficial to an ecosystem? Justify
your answer.
Answer:
I think they are beneficial for the life of those symbiotic organisms that require yes or yes from another to be able to live.
Although an ecosystem could not be carried out if only this relationship would occur, since symbiotic relationships we have an organism where it needs another to live and even removes the necessary nutrients for it, that is why the chain should continue with other types of relationships .
Explanation:
The symbiosis is defined as "Intimate association of organisms of different species to mutually benefit in their vital development" that is why adequate coexistence between these living organisms is needed, otherwise this phenomenon would not occur.
A very good example of the symbiosis is: Bees and plants where the bee is the pollinating agent of the plant so that it continues to reproduce and the plant is the bee's food source.
Therefore I believe that the development of this type of relationship is VITAL, and very fundamental, otherwise I do not know if an ecosystem or a balanced ecosystem could be carried out.
What animals are in the Arctic Tundra?
Answer:
Polar Bears
Arctic Foxes
Seals
Penguins
They all live in the cold, so they all must live in the Arctic Tundra ;)
Answer:
Animals such as polar bears, arctic wolves, and arctic foxes live in the Arctic Tundra.
What force keeps protons and neutrons together?
A. Nuclear Force
B. Electromagnetic Force
C. Proton Force
D. Subatomic Force
Answer:
A)Nuclear Force
Explanation:
Its answer is Nuclear Force keeps protons and neutrons togeather.
How many ml of solution are needed to make a 5.78 M solution with 2.98 moles of CaO?
Answer:
515.6 mL
Explanation:
Please see the step-by-step solution in the picture attached below.
Hope this answer can help you. Have a nice day!
The number of mL of the solution needed to make a 5.78 M solution with 2.98 moles of CaO is 516 mL.
The number of moles that is present in a liter of solution is regarded to be the Molarity of the solution that is measured in mol/L.
[tex]\mathbf{Molarity = \dfrac{number\ of \ moles(n)}{Volume \ (in \ liters)}}[/tex]
[tex]\mathbf{Molarity = \dfrac{2.98 moles }{5.78 \ mol/ L}}[/tex]
Molarity = 0.51557 L
If 1 Liter of solution contains 1000 mL, then 0.51557 L will contain:
= 0.516 × 1000 mL
= 516 mL of solution.
Therefore, we can conclude that the number of mL of the solution needed to make a 5.78 M solution with 2.98 moles of CaO is 516 mL.
Learn more about solutions here:
https://brainly.com/question/1616939?referrer=searchResults
how many molar mass are in k0h?
Answer: 105 u
Explanation:
What are some of the factors that can affect the equilibrium of a chemical reaction?
Answer: Removing Products, Adding Products, Changes in Volume and Pressure, and Changes in Temperature
please help w #64
what type of chemical reaction is it?
Answer:
Complete ionic equation
Explanation:
For every reaction, we could write the molecular equation as well as the ionic equation. The net ionic equation only shows the reaction of the main ions that take part in the reaction. It does not show the reaction of spectator ions.
In order to write the complete ionic equation for any reaction, we must observe the following steps;
We have to start by writing a balanced molecular equation for that particular reaction. Secondly, we split up the soluble strong electrolytes solutions into their constituent ions. It is necessary to indicate the correct formula and charge for each ion participating in the reaction. The individual stoichiometric coefficients of each ion is used toindicate the correct number of all the participating ions. All compounds formed during the reaction are noted with the appropriate symbols (s) for solid, (l) for liquid, or (g) for gaseous respectively.
Using the table on the right, complete each calculation by typing in the correct answer.
13.2L= ? mL
Answer:
13,200 mL
Explanation:
multiply by 1000 to go from L to mL
if you had a neurological disorder affecting your thermoreceptors what symptom would you experience??
quick answers pleasee
Answer:u got me stumped
Explanation:
the volume of one mole of a substance is 22.4 L at STP for all what
Answer:
The molar volume of a gas is the volume of one mole of a gas at STP. At STP, one mole (6.02 × 1023 representative particles) of any gas occupies a volume of 22.4 L (Figure below). A mole of any gas occupies 22.4 L at standard temperature and pressure (0°C and 1 atm).
Explanation: