Answer:
The pH of a solution that has a [OH-] of 5.08x10^-5 M is 5
Explanation:
just took the test
onedg2020
PLEASE HELP!!!!!!! SCIENCEE!!!!
THE CHOICES ARE: 1, 2, 3 FOR THE FIRST ONE.
THE SECOND ONE: from a common ancestor, completely independently of each other
Answer:
a) 1
b) from a common ancestor
Explanation:
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7. 06 equilibrium lab report
I need it bad if anybody has it
Chemical equilibrium is a dynamic equilibrium that is affected by changes in temperature, concentration and pressure
What is chemical equilibrium?Chemical equilibrium is a dynamic state in a chemical reaction in which the rate of forward reaction is equal to the rate of backward reaction.
For a reaction in equilibrium, the following factors affect equilibrium:
temperature pressure concentrationThe principle of chemical equilibrium states that in an isolated system in equilibrium, equilibrium will shift to annul any constraint applied in the system.
Therefore, chemical equilibrium is dynamic and is affected by temperature, concentration and pressure.
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What is the molarity of 5.30 g of Na2CO3 dissolved in 400.0 mL solution?
5.30 g of Na2CO3 dissolved in 400.0 mL solution.
to find:the molarity
solution:[tex]mv = \frac{grams}{molar \: mass} [/tex]
[tex](x)(0.4000l) [/tex]
[tex] = 5.30g |105.988g \: {mol}^{ - 1} [/tex]
[tex] = 0.12501415m[/tex]
[tex] x = 0.125m[/tex]
therefore, the molarity of 5.30 g of Na2CO3 dissolved in 400.0 mL solution is 0.125m.
HELP PLEASE
Earth seems to be the only planet in our solar system that can support life. Which of these is NOT a reason why life is found on Earth?
Question 3 options:
The presence of water on Earth.
It is the perfect distance from the Sun.
It only has slight surface elevation differences
Answer:
it only has slight surface elevation differences
Explanation:
What makes the Earth habitable? It is the right distance from the Sun, it is protected from harmful solar radiation by its magnetic field, it is kept warm by an insulating atmosphere, and it has the right chemical ingredients for life, including water and carbon.
What is the molarity of a methanol solution produced when 0.2 L of a 3 M solution was diluted to 0.8 L?
A-0.2M
B- 0.4M
C-0.75M
D-0.8M
The molarity of the methanol solution produced at the given number of moles and volume is 0.75 M.
Molarity of the methanolThe molarity of the methanol is determined from the ratio of the number of moles of the methanol to the volume of the methanol.
The molarity of the methanol is calculated as follows;
Molarity = moles/volume
moles = 0.2 L x 3 M = 0.6 mole
Molarity = 0.6 mol/0.8 L
Molarity = 0.75 M
Thus, the molarity of the methanol solution produced at the given number of moles and volume is 0.75 M.
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What is the total number of atoms in ammonium hydroxide, NH4OH ?
2
4
7
HELP ASAP
Answer:
7Explanation:
Number of Nitrogen atoms : 1 atom
Number of Hydrogen atoms : 1(4) + 1 = 4 + 1 = 5 atoms
Number of Oxygen atoms : 1 atom
Total atoms
1 + 5 + 17 atomsCalculate atoms of each element
N=1H=4+1=5O=1Total atoms
1+5+17Calculate the volume (in cm3) that 4. 00 cm3 of gas at 30 oC will occupy at 130oC when the pressure is kept constant
The volume of the gas is 5.32 cm³.
To calculate the volume of the gas, we use Charles' law.
Charles' lawCharles' law states that at constant pressure, the volume of a fixed mass of gas is directly proportional to its absolute temperature. This can be expressed mathematically as
Formula:
V/T = V'/T'............. Equation 1Where:
V = Initial volume of the gasV' = Final volume of the gasT = Initial temperature of the gasT' = Final temperature of the gas.Make V' the subject of the equation.
V' = VT'/T......... Equation 2From the question,
Given:
V = 4 cm³T = 30 °C = 303 KT' = 130 °C = 403 KSubstitute these values into equation 2
V' = (4×403)/303V' = 5.32 cm³Hence, the volume of the gas is 5.32 cm³.
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Convert 10.1 kcal to J
1cal=4.184J
Hence
10.1kcal10.1(1000)cal10100cal10100(4.184)42258.4JWhy was October 12,1999 a historic day ?
The United Nations Population Fund designates today in history as the approximate day on which the world population reached six billion.
:)
Each element in the periodic table can be represented by a chemical symbol. Match each element to its chemical symbol.
Na
N
H
Cl
Hg
Mercury
arrowBoth
Sodium
arrowBoth
Nitrogen
arrowBoth
Chlorine
arrowBoth
Hydrogen
arrowBoth
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
The Correct pair of Element and it's symbol ~
Mercury - HgSodium - Na Nitrogen - NChlorine - ClHydrogen - HPredict the effect of each of the following on the indicated equilibrium system in
terms of the direction of equilibrium shift (forward, reverse, or neither)
H2(g) + Cl2(g) <--> 2HCl(g) + 194 kJ
a) addition of Cl2
b) removal of HCI
c) increased pressure
d) decreased temperature
e) removal of H2
f) decreased pressure
g) addition of a catalyst
h) increased temperature
i) decreased system volume
D
The effects of each of the following on the equilibrium system in the question are as follows :
A) Addition of Cl₂ ; equilibrium shifts to reverse
B) Removal of HCl ; equilibrium shifts to the reverse
C) Increased pressure ; neither
D) Decresed temperture ; neither
E) Removal of H₂ ; Forward
F) Decreased pressure : neither
G) Addition of catalyst : Forward
H) Increased temperature : Forward
I) Decresed system volume : Neither
Effects on equilibrium systemThe change in volume and pressure in an equilbrium system with equal number of gaseous molecules of reactants and products will not have an effect on the direction of shift of the equilibrium system. But the change in temperature, increase or decrease of reactants and products will have an effect on the direction of the equilibrium shift of the system.
Hence we can conclude that the effects of the following on the equilibrium system is as listed above.
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The Henry's law constant for H2 is 8.1×10−4 Matm at 25∘C. What pressure of hydrogen is needed to maintain a H2 concentration of 0.42 M?
The pressure of hydrogen needed to maintain a H₂ concentration of 0.42 M is 518.5 atm
Henry's lawThis states that the solubility / concentration of a gas in liquids at constant temperature is proportional to its pressure. Mathematically, it can be expressed as
S = KP
Where
S is the solubility / concentration K is the Henry's constant P is the pressure How to determine the pressure Henry's constant (K) = 8.1×10¯⁴ M/atmConcentration (S) = 0.42 MPressure (P) =?P = S / K
P = 0.42 / 8.1×10¯⁴
P = 518.5 atm
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Can a pressure change shift the equilibrium position in every reversible reaction? Explain
No, a pressure cannot change shift the equilibrium position in every reversible reaction.
How the pressure affect the reversible reaction ?If the pressure increases, the position of equilibrium shift in the direction with the small amount of molecules. This decreases the effect of the change. When the reaction will shift towards the products that means the reaction favor forward.
Factors that affect equilibrium position in reversible reaction.PressureCatalystTemperatureConcentrationFrom the above conclusion we can say that a pressure cannot change the shift of equilibrium position in every reversible reaction.
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The horizontal rows on the periodic table of elements are known as:.
Answer:
periods
Explanation:
In chemsitry, the horizontal columns are known as periods and the vertical columns are known as groups.
What was the initial reactant concentration for the reaction described in part a?.
Answer:
The integrated rate laws for zero-, first-, and second-order reaction may be arranged such that they resemble the equation for a straight line, y = mx + b. Part A The reactant concentration in a zero-order reaction was 0.100 M after 100 s and 1.50x10-2 M after 360 s. What is the rate constant for this reaction? Order 0 1 | 2 Integrated Rate Law Graph [A] =- kt +[A]o [A] vs. t In[A] = -kt + In[A]o In[A] vs. t = kt + Á A vs. t Slope -k -k k Express your answer with the appropriate units. Indicate the multiplication of units, as necessary, explicitly either with a multiplication dot or a dash. ► View Available Hint(s) koth = 3.27x10-4 M S Submi Previous Answers Correct Important: If you use this answer in later parts, use the full unrounded value in your calculations.
Explanation:
a balloon flies off when the opening is released a. Newton’s First Law b. Newton’s Second Law c. Newton’s Third Law
B. Newtons second law! Have a great day!
Determine the pressure change when a constant volume of gas at 0.850 atm is heated from 20.0C to 30.0C
Answer:
0.425 atm
Explanation:
According to Ideal Gas Equation,
PV = nRTTherefore, P ∝ TP₁T₂ = P₂T₁Given :
P₁ = 0.850 atmT₁ = 20.0 CT₂ = 30.0 CSolving :
0.85 x 30 = P₂ x 2030 x 17/20 = P₂ x 20510 = 400P₂P₂ = 510/400 = 1.275 atmChange in pressure = ΔP = P₂ - P₁ = 1.275 - 0.850 = 0.425 atmWhy do some scientists have difficulty communicating about their research to nonscientists?
Answer:
Non-scientists aren't exposed to the information that scientists have in their field of study. Scientists also have their research based on facts, while non-scientists can be biased on their beliefs and chose to ignore data and logic.
Which is an example of an automatic decision that doesn’t require a lot of thinking?
A. To do homework or not
B. What to buy as a gift for someone
C. What to read
D. Whom to invite to your house to play
Answer
to do homework or not
Explanation:
you can figure it out in one second
Answer:
To do homework or not
Explanation: You should always do homework or else you get in big trouble
Pregnant women are often cautioned against cleaning cat litter boxes. This is because Toxoplasma, an intestinal parasite of cats, can be transmitted from infected feces to the expectant mother and ultimately to the fetus. For these reasons, Toxoplasma is considered
a noninfectious disease.
a communicable disease.
an addictive disease.
a nosocomial disease.
a zoonotic disease.
a necrotizing disease.
Answer: a communicable disease
Explanation: key word was transmitted and it was transmitted from a INFECTED living thing and then transmitted to another living thing
How would aluminum and phosphorus form a bond
Explanation:
Aluminum happens to have 3 extra electron's. luckily, every phosphorus atom is looking to gain 3 electrons. it is a perfect match!!!
The substance oxidized causes the other substance to be reduced and is called the:.
Answer:
Reducingagent
Explanation:
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Sodium hydroxide is a strong base. This means that ________. NaOH cannot be neutralized by a weak acid NaOH does not dissociate at all when it is dissolved in water aqueous solutions of NaOH contain equal concentrations of H (aq) and OH-(aq) NaOH dissociates completely to Na (aq) and OH-(aq) when it dissolves in water NaOH produces a gaseous product when it is neutralized
Sodium hydroxide is a strong base means that NaOH dissociates completely to Na (aq) and OH-(aq)
What is a strong base?A strong base is a base that is completely dissociates in solution to yeild the hydroxide ion in high concentration.
Hence, the fact that sodium hydroxide is a strong base means that NaOH dissociates completely to Na (aq) and OH-(aq) when it dissolves in water.
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Changes in which measurement do not shift the equilibrium of a chemical system?
A.) temperature
B.) time
C.) pressure
D.) concentration
Explanation:
i think time. .........
Changes in time do not shift the equilibrium of a chemical reaction.
What is equilibrium?Chemical equilibrium is the state where no net change in the quantity of reactants as well as products occurs during a reversible chemical reaction. A reversible chemical reaction occurs when the products react with the original reactants as soon as they are generated.
What is chemical reaction?A chemical reaction occurs when one or more compounds, known as reactants, are changed into one or more distinct substances, known as products. Chemical elements or compounds are examples of substances. A chemical reaction organizes the constituent atoms of both the reactants to produce various products.
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For a gaseous reaction, N2 + 3H2 gives 2NH3. If 20 ml of nitrogen completely reacts with hydrogen, then what is the volume of produced NH3?
N2(g) + 3H2(g) → 2NH3(g)
20ml of nitrogen
to find:the volume of produced NH3
solution:So, 1 volume of nitrogen gas reacts with 3 volumes of hydrogen gas to produce 2 volumes of ammonia gas.
For this gaseous reaction in which all the reactants and products are gases we could write a chemical equation:
1 volume N2(g) + 3 volumes H2(g) → 2 volumes NH3(g)
1 volume of N2 is 20 ml so 2 volume of NH3 will be 40 ml .
Then , 20 ml N2 will give 40 ml of NH3
= 40 ml
what is 2CO in a chemical formula
Answer:
Co2
Explanation:
The coefficient 2 is multiplied on the invisible 1 (Co1) so it becomes CO2
Or
2co represents 2 molecule of carbon monoxide
What volume of a o.25m solution can be prepared with 28.5g of k2s molar mass 110.26
Answer: Can you repost the answer it will not let post my answer
Explanation: pleaee
PLS HELP I NEED ASAP
what is the slowest speed for an object to escape the gravitational attraction of a celestial body (planet, moon, etc.)?
Answer:
the escape velocity
Explanation:
To do this, your rock has to go very fast – more than 11 kilometers per second. This velocity is called the escape velocity, the speed an object must achieve in order to overcome the gravitational attraction of a celestial body (be it a planet, a star, or a galaxy) and escape into space
found it online, lol better then nothing
The volume of a gas is 204 ml when the pressure is 925 kPa at constant temperature what is the final pressure if the volume increases to 306 ml?
Calculate. 925 x 1.5 is 412.5 + 412.5 + 412.5.
This totals to 1387.5 kPa.
Suppose two gasses in a container have a total pressure of 1.20 atm. What is the pressure of gas B if the partial pressure of gas A is 0.68 atm
Answer:
The partial pressure of gas B is 0.52atm
Explanation:
Pt = Pa + Pb
Pb = Pt - Pa
Pb = 1.20 atm - 0.68 atm
Pb = 0.52 atm