Answer:
I would say go with B not so sure but pretty sure it is
When collecting temperature as a function of time for the reaction of KOH with HCL, which time is most significant
Answer:
At the completion of reaction.
Explanation:
The time when the reaction take places is the most significant time for measuring temperature of the solution because on this time the temperature will decrease or increase. Some reactions releases heat energy upon completion we called them exothermic reactions whereas some absorb heat energy from the surrounding, decreases the temperature which is known as endothermic reaction so measuring temperature at the completion of reaction is the correct time.
How Do OBJECTS BEGIN MOVING?
When a outside force acts upon it.
5. Para la siguiente reacción: KClO3 (s) KCl(s) + O2
Si se descomponen 500 gramos de una muestra impura de clorato de potasio y se recogen 100 litros de O2 medidos bajo condiciones normales de presión y temperatura. Determine la pureza de la muestra.
Answer:
72.95%
Explanation:
Para resolver esta pregunta, debemos hallar las moles tóricas que se producirían en la reacción asumiendo que los 500g son únicamente de clorato de potasio haciendo uso de la reacción balanceada:
2KClO₃(s) → 2KCl(s) + 3O₂(g)
Donde dos moles de clorato de potasio producen tres moles de oxígeno.
Después de hallar las moles teóricas de oxígeno debemos hallar las moles producidas usando PV = nRT. La pureza SERÁ:
Moles producidas / moles Teóricas * 100
Moles clorato -Masa molar: 122.55g/mol-:
500g KClO₃ * (1mol / 122.55g) = 4.08 moles KClO₃
Moles O₂ teóricas:
4.08 moles KClO₃ * (3 moles O₂ / 2 moles KClO₃) = 6.12 moles
Moles producidas:
PV / RT = n
Donde P = 1atm a STP
V es volumen = 100L
R es constante de los gases = 0.082atmL/molK
T =273.15K a STP
Reemplazando:
1atm*100L / 0.082atmL/molK*273.15K = 4.46 moles
La pureza de la muestra es:
4.46 moles / 6.12 moles * 100 = 72.95%
Which element is used in the treatment of patients with respiratory diseases in hospitals?
Answer:
I think the oxygen.
Answer:
Oxygen (O2)
Explanation:
The fundamental importance of oxygen to life on this planet ensures its place in the care of patients with respiratory disorders. Although now well established for hypoxic patients, many questions remain regarding the benefits of oxygen for varying severity and types of chronic lung disease.
What do dwarf planets, asteroids, and comets have in common
Answer:
Asteroids and comets have a few things in common. They are both celestial bodies orbiting our Sun, and they both can have unusual orbits, sometimes straying close to Earth or the other planets. ... While asteroids consist of metals and rocky material, comets are made up of ice, dust, rocky materials and organic compounds.
What is the volume of an object that has a mass of 5.80 g and a density of 6.35 g/mL?
Answer:
1.09 mL
Explanation:
Density is a measure of a substance's mass over its volume.
d = m/v
We can rearrange the equation to solve for volume, using algebra.
v = d/m
Therefore v = 6.35/5.80 = 1.09 mL
PLZ HELP PPPLLLLLZZZZ HELP ITS OVER DUE PPPPPPPPPPPLLLLLLLLLLLLLLLLLLLLZZZZZZZZZZZ
How many calories are needed to change 18.2 g of water from 25.2°C.to 67.4 °C.?
Answer:
Q = 0.768 calorie
Explanation:
Given that,
Mass of water, m = 18.2g
The temperature changes from 25.2°C to 67.4 °C.
The specific heat of water, c = 4.184 J/g °C
We need to find the heat needed to change in temperature. The formula is given by :
[tex]Q=mc\Delta T\\\\Q=18.2\times 4.184\times (67.4-25.2)\\\\Q=3213.47\ J[/tex]
We know that, 1 calorie = 4184 J
or
1 J = (1/4184) calories
t means,
[tex]3213.47\ J=\dfrac{3213.47}{4184}\ J\\\\=0.768\ calorie[/tex]
So, the required heat needed is 0.768 cal.
So, 0.768 calorie of heat is needed.
How many grams of ammonia would be produced from the reaction of 2.64 moles of hydrogen gas reacting with excess nitrogen?
Answer:
29.92g
Explanation:
tell me if my answer is wrong
1 point
have specific requirements that need to be met in order for an
entrepreneur to be considered.
O Loans
O Investments
O None of the other answers
O Grants
How many grams of oxygen are required to burn 13.5 g of acetylene
Answer:
41.54 grams of oxygen are required to burn 13.5 g of acetylene
Explanation:
The balanced reaction is:
2 C₂H₂ + 5 O₂ → 4 CO₂ + 2 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
C₂H₂: 2 moles O₂: 5 moles CO₂: 4 moles H₂O: 2 molesBeing the molar mass of the compounds:
C₂H₂: 26 g/moleO₂: 32 g/moleCO₂: 44 g/moleH₂O: 18 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
C₂H₂: 2 moles* 26 g/mole= 52 gramsO₂: 5 moles* 32 g/mole= 160 gramsCO₂: 4 moles* 44 g/mole= 176 gramsH₂O: 2 moles* 18 g/mole= 36 gramsYou can apply the following rule of three: if by stoichiometry 52 grams of acetylene react with 160 grams of oxygen, 13.5 grams of acetylene react with how much mass of oxygen?
[tex]mass of oxygen=\frac{13.5 grams of acetylene*160 grams of oxygen}{52 grams of acetylene}[/tex]
mass of oxygen= 41.54 grams
41.54 grams of oxygen are required to burn 13.5 g of acetylene
THIS IS SCIENCE
PLEASE HELP
Answer:
An unbalanced force? .
Pls give me feedback if thats not right.
list out the effects seen inplants due to lack of phosphorus.
Answer:
Plants normally turn dark green and look stunted (both leaves and stalks). Older leaves are first affected and may become violet. Sometimes the brown tips of the leaves remain fragile and their maturity seems to be delayed.
Explanation:
it is what it is booiiii
Pl help it’s for a grade
Answer:
A
Explanation:
kinetic energy of a body at rest = 0
Al derretirse los cubos de hielo cómo será ahora la fuerza de atracción con respecto a la fuerza de repulsión
Answer:
La fuerza de atracción en el hielo sólido, que es un compuesto molecular, se debe al enlace de hidrógeno (que es la fuerza intermolecular más fuerte) entre las moléculas individuales de agua, por lo tanto, el hielo sólido es bastante fuerte y se mantiene en una estructura rígida.
Cuando el hielo se calienta, las moléculas absorben suficiente energía y, en lugar de solo la vibración del hidrógeno dentro de un área muy pequeña, los enlaces de hidrógeno se doblan y se estiran, con los ángulos y la longitud de los enlaces oscilando dentro de los rangos esperados.
Como tal, las fuerzas de atracción en el agua líquida son menores que las del hielo y las fuerzas de repulsión entre cargas similares tienen un efecto mayor en la plasticidad del agua que el hielo.
Explanation:
How is Melting and Cooling of Rock like a Chocolate Bar?
Answer:
Melting and cooling of a rock is like a chocolate bar because, when chocolate melts, it happens with heat just like melting of a rock. When chocolate cools, it just becomes a solid with no heat just like rocks when becoming an igneous rock.
Explanation:
You can kinda re-phrase it if u want cause yea. hhah.
- How does melting point compare among molecular compounds and ionic compounds?
Molecular compounds tend to have lower melting points.
Molecular compounds tend to have higher melting points.
Both compounds have melting points within the same temperature range.
Answer:
The melting and boiling points of molecular compounds are generally quite low compared to those of ionic compounds. This is because the energy required to disrupt the intermolecular forces between molecules is far less than the energy required to break the ionic bonds in a crystalline ionic compound (Figure 6.2. 1) .
Explanation:
hopefully this helps :)
if not then here. (Most of the time, the melting points of ionic compounds are very high compared to the melting points of molecular compounds.)
Answer: A. Molecular compounds tend to have lower melting points
Explanation:
which of the following is not found in cytoplasm
A.water
B.carbohydrates
C.salt
D.vitamins
Answer:
Carbohydrates
Explanation:
this is because cytoplasm is a substance that fills living cells.
What is the standard cell notation of a galvanic cell made with aluminum and
nickel?
A. Ni(s) | Ni2+ || A13+(aq) | Al(s)
B. Al(s)| A13+(aq) || Ni2+(aq) | Ni(s)
C. Ni2+(aq) | Ni(s) || Al(s) | A13+(aq)
D. A13+(aq) | Al(s) || Ni(s) | Ni2+(aq)
D. A13+(aq) | Al(s) || Ni(s) | Ni2+(aq). The standard cell notation of a galvanic cell made with aluminum and nickel is A13+(aq) | Al(s) || Ni(s) | Ni2+(aq).
How do you represent galvanic cells in cell notation?The anode is on the left, and the cathode is on the right. The convention specifies that metals come first and then the metal ions present in the electrolyte represent the cell. And a vertical line is required to separate these two.
What does common cell notation entail?Voltaic or galvanic (spontaneous) cells are denoted by cell notations in shorthand. This special shorthand describes the anode, cathode, and electrode components as well as the reaction circumstances (pressure, temperature, concentration, etc.).
What materials make up a galvanic cell?A galvanic cell is made up of two distinct metals (electrodes), connected externally to complete a circuit and through a conducting liquid (an electrolyte).
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If the moon is half full on January 2, on approximately what date will it next become full?
A. February 15
B. February 2
C. January 31
D. January 9
Answer: don’t listen to him the answer is January 9
Explanation: jus took the test
Determine the molarity of a solution formed by dissolving 0.968 g of MgCl2in enough water to yield 150.0 mL of solution.
Answer:
M = 0.0678 M
Explanation:
Hello there!
In this case, since the molarity of a solution is obtained by dividing the moles by the volume, it is firstly necessary to compute the moles of magnesium chloride in 0.968 g, via its molar mass, as shown below:
[tex]n=\frac{0.968g}{95.21g/mol}=0.0102mol[/tex]
Next, since 150.0 mL in liters is 0.1500 L, according to the appropriate units, the resulting molarity is:
[tex]M=\frac{0.0102mol}{0.1500L}\\\\M=0.0678M[/tex]
Best regards!
A case of paper has a mass of 2000 g. A case of paper contains 10 reams of paper. One ream of paper is 500 sheets. What is the mass, in grams, of 50 sheets of paper?
Answer:
s8sooooosoossososososkdk
During photosynthesis, plants change light energy into:
chemical energy
solar energy
mechanical energy
electrical energy
i will mark brainlest
Answer:
chemical energy
Explanation:
just put that
Answer:
chemical energy
Explanation:
it is the light dependent reaction
How many grams of Ag2S
are produced from 10.0
grams of AgI?
10
AgI + Nazs
Ag2S +NaI
Answer:
10.0 g of AgI will produce 5.28 g of Ag₂S
Explanation:
The balanced equation of the reaction is given below:
2AgI + Na₂S ----> Ag₂S + 2NaI
From the equation of reaction, 2 moles of AgI produces 1 mole of Ag₂S
The moles of a substance is related to its mass by a quantity known as molar mass which is defined as the mass of one mole of that substance.
Molar mass of AgI = (108 + 127) g = 235 g
Molar mass of Ag₂S = (108 × 2 + 32) g= 248 g
Mass of 2 moles of AgI = 2 × 235 g = 470 g
470 g of AgI produces 248 g of Ag₂S
10 g of AgI will produce 248 /470 × 10 g of Ag₂S = 5.28 g
Therefore, mass of Ag₂S produced = 5.28 g
help i dont wanna read
Answer:
I do not really no sorry
Explanation:
:))
An atom has 5 protons in its nucleus that gives it a positive charge. What can be inferred about the number and position of other particles that make the atom electrically neutral? *
A. 5 neutrons are located inside the nucleus.
B. 5 electrons are located inside the nucleus.
C. 5 neutrons are located outside the nucleus.
D. 5 electrons are located outside the nucleus.
Answer:
D. 5 electrons are located outside the nucleus.
Explanation:
Protons have a +1 positive charge, electrons have a -1 negative charge. Protons are in the nuclues and electrons are orbiting in the electron cloud.
Students in a science class learn that groundwater is an important
source of drinking water for many communities. They construct a model
to study how leaking chemicals from a landfill can affect groundwater.
What is the most effective way for the students to see how leaking
chemicals from a landfill can enter a well?
Select one:
A: Pump water out of the well to see how stained water from the tissue paper
moves toward the well.
B: Drop food color into the well at the well's opening.
C: Tear some of the colored tissue paper and put the paper pieces into the well at
the well's opening
D: Tilt the tank towards the well and drain some of the water out of the tank.
Can someone please help me with this
Why is it important to know characteristics that matter undergoes in chemistry? How can we analyze the relationships between chemical and physical changes and properties?
Answer:
It's important for scientists to know the properties of matter because all things are made up of matter. Each type of matter has different physical characteristics and scientists need to know and understand these characteristics to make calculations. ... The main phases of matter are solid, liquid, and gas.
Find the pH of a 0.25 M solution of lactic acid, HC3H5O3 (Ka = 8.3 x 10 -4 ).
Answer:
pH → 1.83
Explanation:
Let's write the lactic acid as HLac, because it is a monoprotic weak acid.
HLac + H₂O ⇄ H₃O⁺ + Lac⁻ Ka
Initially we have 0.25 moles, so x amount has reacted. At the end, when the equilibrium is finished, we may have (0.25 - x) moles of acid, x moles of protons have been released and x moles of lactate were formed.
In order to find x, we use the acid constant, Ka. The expression for Ka is:
Ka = [H₃O⁺] . [Lac⁻] / [HLac]
8.3×10⁻⁴ = x² / (0.25-x)
8.3×10⁻⁴ (0.25 - x) = x²
8.3×10⁻⁴ . 0.25 - 8.3×10⁻⁴x - x² → this is a quadractic function
a = -1, b = 8.3×10⁻⁴, c = 2.07×10⁻⁴
We solve: (-b - √(b² - 4ac) / (2a)
(-8.3×10⁻⁴ - (√ ((8.3×10⁻⁴)² - 4 (-1) (2.07×10⁻⁴) ) / (2 . -1) = 0.0148
[H₃O⁺] = 0.0148 M
- log [H₃O⁺] = pH → - log 0.0148 = 1.83
The pH is defined as the power of Hydrogen. The pH of a 0.25 M solution of lactic acid is 1.83.
[tex]\bold { CH_3COOH \rightarrow CH_3 COO + H^+\ \ \ \ \ \ \ \ \ \ \ \ (Ka = 8.3 x 10 -4 ).}[/tex]
Initial concentration of lactic acid is 0.25 M, So, [tex]x[/tex]. At the end of equilibrium [tex]x[/tex] amount of lactic acid dissociates.
So, concentration of the Hydrogen ion in the (0.25 - [tex]x[/tex])
[tex]x[/tex] can be found out by using the dissociation constant formula,
[tex]\bold {Ka = \dfrac {[H^+][CH_3COO^-]}{[Ch_3COOH]}}\\[/tex]
[tex]\bold {8.3x10^-^4= \dfrac {[x][x]}{[2.5- x]}}\\\\\bold {8.3x10^-^4= \dfrac {[x^2]}{[2.5- x]}}\\\\\bold {x^2= 8.3x10^-^4\times [2.5- x]}}\\\\\bold {8.3x10^-^4 \times 0.25 - 8.3x10^-^4 x - x^2 = 0}[/tex]
The equation above is a quadratic equation, solving it we get,
The concentration of protons = 0.0148 M
Put this into the pH formula,
[tex]\bold {pH = -log [H^+]}[/tex]
[tex]\bold {pH = -log [ 0.0148]}\\\\\bold {pH = 1.83}[/tex]
Therefore, the pH of a 0.25 M solution of lactic acid is 1.83.
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