Answer:
pH of solution is: 12.82
Explanation:
The reaction of hydrochloric acid with calcium hydroxide is:
Ca(OH)₂ + 2 HCl → H₂O + CaCl₂
Where 2 moles of hydrochloric acid react with 1 mole of calcium hydroxide
Moles of HCl and moles of Ca(OH)₂ are:
Moles HCl:
0.02500L × (0.155mol / L) = 3.875x10⁻³moles HCl
Moles of Ca(OH)₂:
0.03500L × (0.112mol / L) = 3.92x10⁻³moles Ca(OH)₂
Moles of Ca(OH)₂ that react are:
3.875x10⁻³moles HCl × (1 mol Ca(OH)₂ / 2 mol HCl) = 1.9375x10⁻³ mol Ca(OH)₂
Thus, moles of Ca(OH)₂ that remain are:
3.92x10⁻³moles Ca(OH)₂ - 1.9375x10⁻³ mol Ca(OH)₂ = 1.9825x10⁻³ mol Ca(OH)₂
Moles of OH⁻ are:
1.9825x10⁻³ mol Ca(OH)₂ × (2mol OH⁻ / 1mol Ca(OH)₂) = 3.965x10⁻³ mol OH⁻
As volume is 25mL + 35mL = 60mL ≡ 0.060L. Molar concentration of OH⁻ is:
3.965x10⁻³ mol OH⁻ / 0.060L = 0.066M OH⁻.
pOH = -log [OH⁻]
pOH = 1.18
pH = 14-pOH
pH of solution is: 12.82
Answer:
pH = 12.80
Explanation:
Step 1: data given
Volume of a 0.155 M Ca(OH)2 = 25.00 mL = 0.025 L
Volume of a 0.112 M HCl = 35.00 mL = 0.035 L
Step 2: The balanced equation
Ca(OH)2 + 2HCl → CaCl2 + 2H2O
Step 3: Calculate moles
Moles = molarity * volume
Moles Ca(OH)2 = 0.155M * 0.025 L
Moles Ca(OH)2 = 0.003875 moles
Moles HCl = 0.112 M * 0.035 L
Moles HCl = 0.00392 moles
Step 4: Calculate the limiting reactant
For 1 mol Ca(OH)2 we need 2 moles HCl to produce 1 mol CaCl2 and 2 moles H2O
HCl is the limiting reactant. It will completely be consumed. (0.00392 moles) Ca(OH)2 is in excess. There will react 0.00392 / 2 = 0.00196 moles
There will remain 0.003875 - 0.00196 = 0.001915 moles Ca(OH)2
Step 5: Calculate molarity of Ca(OH)2
Molarity = moles / volume
Molarity Ca(OH)2 = 0.001915 moles / (0.060 L)
Molarity Ca(OH)2 = 0.0319 M
For 1 mol Ca(OH)2 we have 2 moles OH-
Molarity of OH- = 2*0.0319 = 0.0638 M
Step 6: Calculate pH
Since Ca(OH)2 is a strong base
The ph will be the pH of a strong base
pOH = -log[0.0638)
pOH = 1.20
pH = 14 -1.20 = 12.80
what does calibrating the cabbage pH indicator mean
Answer:
Calibrating the cabbage pH indicator means creating a color key based on solutions that have known pH values.
Explanation:
Answer: 1st a
2nd b, d
3rd a
Explanation:
If you have two moles of N2, how many miles of H2 would you need to produce four moles of NH3?
1. If 400 grams of C2H6O2 is added to 4,000 g of water, calculate the molality?
Answer:
1)1.61molKg-1
Explanation:
we find the molality using the formula mole of solute/Kg of solvent..
For the formation of ammonia, NH3, the enthalpy of reaction is shown:
3H2(g) + N2(g) --> 2NH3(8)
AH = -45.9 kJ
How much energy is required to convert ammonia back to hydrogen and nitrogen?
Answer: The amount of energy required to convert ammonia back to hydrogen and nitrogen is 45.9 kJ
Explanation:
Endothermic reactions are defined as the reactions in which energy is absorbed in the reaction. The enthalpy change of the reaction is positive.
Exothermic reactions are defined as the reactions in which energy is released in the reaction. The enthalpy change of the reaction is negative.
For the given chemical equation:
[tex]3H_2(g)+N_2(g)\rightarrow 2NH_3(g);\Delta H=-45.9kJ[/tex]
In the above reaction, the enthalpy change is negative. So, the reaction is exothermic in nature.
For the reverse reaction, the magnitude of the enthalpy change remains the same but sign for it changes.
Hence, the amount of energy required to convert ammonia back to hydrogen and nitrogen is 45.9 kJ
most radioactive place on earth
Answer: Ramsar, Iran (happy to help)
Explanation:
Match each plot element on the left with the correct description of it in a morality tale.
The consequences of the choice
falling action
become clearer.
resolution
A character makes a decision.
rising action
The major conflict is introduced
Oo
IN
exposition
The reader understands the moral.
climax
A character struggles with a decision
Answer:
Rising action- A character struggles with a decision.
falling action- The consequences of the choice become clearer.
Climax- A character makes a decision.
Resolution- A character understands the moral.
Exposition- A major conflict is introduced.
Explanation:
no one else gave the right answer so I found out myself, but hey! always that one person right! Good luck!
Answer:
your welcome
Explanation:
What is not a guideline required for a valid evidence test?
A. The test must be conducted by a forensic scientist in a forensics lab.
B. The test must be reproducible, producing the same results every time using the same samples.
C. The test must be specific to identify a particular substance.
D. The test must be sensitive in that it can pick out the unique characteristics in a sample
Answer:
The correct answer is indeed A
Explanation:
A scientific theory never changes. ture or false ?
Answer:
False.
Explanation:
Scientific theories and hypothesis are all tentative. Science tries to prove something is either true of false and come up with answers (as much as we can) for many problems. Sometimes they are made based on limited data or information. Over the years, we come up with need findings discoveries which are able to give us more information and give us better answers. There have been a couple of scientific laws which had to be completely revised or discarded after new observations. An example of this would be the Laws of Thermodynamics. A couple of the laws have been changed over the decades after scientists made new disoveries and observations.
Pleassssdseee help meee
Rewrite this chemical reaction with the correct coefficients. Mg + Ag+ -> Mg2+ +
Ag*
Answer:
Mg + 2Ag⁺ ⟶ Mg²⁺ +2Ag
Explanation:
1. Start with the skeleton equation.
Mg + Ag⁺ ⟶ Mg²⁺ + Ag
2. Separate it into two half reactions
Mg ⟶ Mg²⁺
Ag⁺ ⟶ Ag
3. Balance charge by adding electrons to the deficient side
Mg ⟶ Mg²⁺ + 2e⁻
Ag⁺ + e⁻ ⟶ Ag
4. Multiply each half-reaction by numbers to equalize the electrons transferred
1×[Mg ⟶ Mg²⁺ + 2e⁻]
2×[Ag⁺ + e⁻ ⟶ Ag]
5. Add the two half-reactions, cancelling species that occur on each side
Mg ⟶ Mg²⁺ + 2e⁻
2Ag⁺ + 2e⁻ ⟶ 2Ag
Mg + 2Ag⁺ ⟶ Mg²⁺ +2Ag
The equation is now balanced.
What type of substance would be best for use in a cooling system?
a gas with a low specific heat
a liquid with a high specific heat
a solid with a high specific heat
a liquid with a low specific heat
Answer:
Liquid with a specific high heat
Explanation:
The type of substance would be best for use in a cooling system would be a liquid with a high specific heat and the correct option is option B.
What is Specific heat?
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.
The units of specific heat are usually calories or joules per gram per Celsius degree. For example, the specific heat of water is 1 calorie (or 4.186 joules) per gram per Celsius degree.
This property of water in our body to maintain constant body temperature.
Therefore, The type of substance would be best for use in a cooling system would be a liquid with a high specific heat and the correct option is option B.
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Which goes with this phase days after the rainstorm the playground is now dry
Which of the following gases diffuse more slowly than oxygen? F2, Ne, N2O, C2H2, NO, Cl2, H2S
Answer:
Cl2, N2O, F2, H2S
Explanation:
You must recall Graham's law at this point. Graham's law states that the rate of diffusion of a gas is inversely proportional to the square root of its vapour density or molar mass.
Now, the greater the molar mass of a gas, the lesser the rate of diffusion of that gas. The gas that will diffuse more slowly than oxygen must have a higher molar mass than oxygen. Oxygen has a molar mass of 32gmol-1, let us look at the molar masses of other gases.
F2= 37.99681 g/mol
Ne= 20.1797 gmol-1
N2O= 44.013 g/mol
C2H2= 26.04 g/mol
NO= 30.01 g/mol
Cl2= 70.906 gmol-1
H2S= 34.1 g/mol
Hence in order of decreasing slower diffusion than oxygen gas
Cl2, N2O, F2, H2S
Neon, Nitrous Oxide, and Hydrogen Sulfide diffuse more slowly than oxygen.
Explanation:Oxygen (O2) is a diatomic gas that diffuses relatively quickly. Among the given gases, Neon (Ne), Nitrous Oxide (N2O), and Hydrogen Sulfide (H2S) diffuse more slowly than oxygen. Neon is a monatomic gas with a larger atomic mass, which affects its diffusion rate. Nitrous Oxide is a larger, more complex molecule, and Hydrogen Sulfide has a hydrogen bond, both of which slow down their diffusion rates compared to oxygen.
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2.00 moles of an ideal gas was found to occupy a volume of 17.4L at a pressure of 3.00 atm and at a temperature of 45 C. Calulate the value of the cas constant R in
Answer:
[tex]0.082 atm L mol^{-1} K^{-1}[/tex]
Explanation:
The pressure, the volume and the temperature of an ideal gas are related to each other by the equation of state:
[tex]pV=nRT[/tex]
where
p is the pressure of the gas
V is the volume of the gas
n is the number of moles
R is the gas constant
T is the absolute temperature
For the gas in this problem:
n = 2.00 mol is the number of moles
V = 17.4 L is the gas volume
p = 3.00 atm is the gas pressure
[tex]T=45C+273=318 K[/tex] is the absolute temperature
Solving for R, we find the gas constant:
[tex]R=\frac{pV}{nT}=\frac{(3.00)(17.4)}{(2.00)(318)}=0.082 atm L mol^{-1} K^{-1}[/tex]
Balance N2 + H2 —NH3 what type of reaction
3350 J of heat is required to raise the temperature of a sample of AlF3 from 250C to 800C. What is the mass of the sample?
I just want to know how to work this out. Please help me.
Final answer:
To find the mass of the AlF₃ sample that requires 3350 J to increase its temperature from 25°C to 80°C, we use the heat capacity formula. The specific heat capacity of aluminum (900 J/kg°C) is used and the mass is calculated to be 0.0677 kg or 67.7 grams.
Explanation:
To calculate the mass of the sample of AlF₃ that needed 3350 J of heat to raise its temperature from 25°C to 80°C, we use the heat capacity formula:
Q = mcΔT, where Q is the heat added, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.
The specific heat capacity of aluminum is 900 J/kg°C. Then we will solve for the mass (m) and rearrange the formula to m = Q/(cΔT).
Given that:
Q = 3350 Jc = 900 J/kg°CΔT = 80°C - 25°C = 55°CThe calculation for the mass m is:
m = 3350 J / (900 J/kg°C × 55°C)
m = 3350 J / (49500 J/kg)
m = 0.0677 kg
Therefore, the mass of the AlF₃ sample is 0.0677 kg or 67.7 grams.
The mass of an electron is
A. equal to the proton mass plus the neutron mass
B. the smallest of the three major particles
C. the same as the mass of the proton
D. the same as the mass of the atom
Answer:
B
Explanation:
technically an electron has a very negligible mass
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How does water move during the water cycle?
A.
Water moves in a continuous cycle from the surface of the Earth, through the crust, oceans, and atmosphere.
B.
Water moves through a non-repeating cycle from the surface of the Earth, through the crust, oceans, and atmosphere.
C.
Water moves in a continuous cycle from the oceans to beneath the Earth's surface only.
D.
Water moves through a non-repeating cycle from the oceans to beneath the Earth's surface only.
Answer:
A.Water moves in a continuous cycle from the surface of the Earth, through the crust, oceans, and atmosphere.
Thank You.
☆ ★ Make It Brainlist Answer....
Energy is conserved in chemical reactions. It is neither created nor_____
An exothermic reaction
transfers energy______
the reacting substances
the surroundings.An______
reaction transfers energy from the surroundings to the reacting substances
Answer:
destroyed, from, endothermic
Explanation:
Energy is conserved in chemical reactions. It is neither created nor destroyed but can be transferred from one form to another.
An exothermic reaction transfers energy from the reacting substance to the surroundings. The body of the container feels warm. An exothermic reaction has a negative value of enthalpy.
An endothermic reaction transfers energy from the surroundings to the reacting substance. The body of the container feels cold. In an endothermic reaction, enthalpy is positive.
What are eggshells made of?
Answer:
Eggshell is made almost entirely of calcium carbonate
Explanation:
Rocks, as they are compressed, begin forming mountains above the Earth's surface when two continental plates converge.
The continental crust increases in depth as the mountains grow above. The Himalayan Mountains formed at a convergent
plate boundary in this manner. The rocks are smashed together causing them to
due to the intense heat and
pressure from the colliding plates and eventually forming
rock.
melt; igneous
layer; sedimentary
recrystallize; metamorphic
melt into the Earth's interior; metamorphic
Final answer:
Continental plates colliding under intense pressure and heat cause existing rocks to recrystallize into metamorphic rocks, contributing to the formation of mountain ranges such as the Himalayas.
Explanation:
When two continental plates converge, the intense pressure and heat they generate cause the existing rocks at the plate boundary to recrystallize, forming metamorphic rocks. This process, often associated with mountain building, is evident in the formation of the Himalayan Mountains at such a convergent plate boundary. Between colliding continental masses, like the African plate and the Eurasian plate forming the Alps, or the Asian and Arabian plates creating the Zagros Mountains, the pressure and heat metamorphose the rocks in the mountain chains. The creation and the shaping of these mountains are not solely due to tectonic forces but are also significantly affected by volcanic activity and erosion by elements like water and ice over time.
What type of isomerism is shown by alkanes
Answer:
Alkanes with more than 3 carbons can show constitutional isomerism. They can be either linear or branched structures. This is categorized as chain isomerism. Butane is the smallest alkane to show such isomerism with 2 isomers.Alkanes with more than 3 carbons can show constitutional isomerism. They can be either linear or branched structures. This is categorized as chain isomerism. Butane is the smallest alkane to show such isomerism with 2 isomers.
Explanation:
Final answer:
Alkanes exhibit structural isomerism, including branched-chain isomerism, where the same molecular formula has different structural arrangements. Alkenes can show structural as well as geometric isomerism due to the rigidity of the double bond.
Explanation:
Isomerism in Alkanes
The type of isomerism shown by alkanes is called structural isomerism, specifically branched-chain isomerism. This occurs when alkanes with the same molecular formula have different arrangements of carbon atoms. For example, butane (C4H10) can exist as a straight-chain alkane or it can have a branched-chain structure, resulting in isomers with different physical properties.
Branched-chain alkanes and straight-chain alkanes are isomers because they have the same molecular formula but different structural formulas, leading to different physical properties. In contrast, alkenes can exhibit structural isomerism as well as geometric isomerism, also known as cis-trans isomerism, which occurs due to restricted rotation around the double bond.
While alkanes only show structural isomerism such as straight-chain and branched-chain structures, alkenes can show both structural and geometric isomerism, where the spatial orientation of groups attached to the double bond leads to distinct isomers. This rigidity of the double bond in alkenes influences their chemical reactivity and physical properties.
Coconut oil is commonly used as a fuel. Palmitic acid is the primary ingredient that produces the heat. Balance the combustion reactions for palmitic acid.
C16H32O2 + O2 → CO2 + H2O
Answer:
The answer is C16H32O2 + 23 O2 ---> 16CO2 + 16H2O
Explanation:
Answer:
blank, 23, 16 , 16
Explanation:
look at my ss
A platinum bar measures 5.0 cm long and 4.0 cm wide and 1.5 cm thick. It has a mass of 700.0 g calculate the mass of the platinum bar?
The mass of the platinum bar is approximately 699.9 grams.
To calculate the mass of the platinum bar, we can use its volume and density.
Given:
- Length (l) = 5.0 cm
- Width (w) = 4.0 cm
- Thickness (h) = 1.5 cm
- Mass (m) = 700.0 g
First, let's calculate the volume of the platinum bar using the formula for the volume of a rectangular prism:
[tex]\[ \text{Volume} = l \times w \times h \\\[ \text{Volume} = 5.0 \, \text{cm} \times 4.0 \, \text{cm} \times 1.5 \, \text{cm} \\\[ \text{Volume} = 30.0 \, \text{cm}^3 \][/tex]
Now, we can use the density formula to find the mass:
[tex]\[ \text{Density} = \frac{\text{Mass}}{\text{Volume}} \\\[ \text{Density} = \frac{700.0 \, \text{g}}{30.0 \, \text{cm}^3} \\\[ \text{Density} \approx 23.33 \, \text{g/cm}^3 \][/tex]
Now that we have the density of platinum, we can calculate the mass of the bar:
[tex]\[ \text{Mass} = \text{Density} \times \text{Volume} \\\[ \text{Mass} = 23.33 \, \text{g/cm}^3 \times 30.0 \, \text{cm}^3 \\\[ \text{Mass} \approx 699.9 \, \text{g} \][/tex]
So, the mass of the platinum bar is approximately 699.9 grams.
hi:) are electrostatic forces ionic bonding? I’m kinda confused :/
Answer:
Yes indeed BRUVA!!!! Electrostatic is a term used to describe the charges of the ionic compound
1. What is the difference between charging by conduction and charging by induction?
A- During induction, charges move between objects that briefly touch; during conduction, charges move between objects that are rubbed together.
B- During conduction, charges move between objects that briefly touch; during induction, charges move between objects that are rubbed together.
C- During induction, charges move between touching objects; during conduction, charges are redistributed within an object that is near another object.
D- During conduction, charges move between touching objects; during induction, charges are redistributed within an object that is near another object.
Answer:a
Explanation:
The difference between charging by conduction and charging by induction is
A. During induction, charges move between objects that briefly touch; during conduction, charges move between objects that are rubbed together.
What is conduction and induction?Conduction charges another body with a charged body by came in contact with that body.
Induction charges another body without came in contact with that body.
Thus, the correct option is A
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What is the molar mass of sodium carbonate (Na2CO3)?
Answer:
105.9888 g/mol
Explanation:
The molar mass of sodium carbonate is 105.9888 g/mol (grams per mole)
1. A dichotomous key helps us _____________ organisms. identify dissect 2. A dichotomous key us3. Typically, a dichotomous key moves from the _______ to the specific traits when helping us to identify organisms. general unknown
Answer:
Identify
Explanation:
I just did a USATestprep on it your welcome
Answer:
identify
Explanation:
A student must use 225 g of hot water in a lab procedure. Calculate the amount of heat in joules required to raise the temperature of 225 g of water from 20.0 °C to 100.0 °C. (Water’s specific heat capacity is 4.184 J/g°C) (round answer to 2-3 sig figs)
Answer:
Q = 75.312 KJ
Explanation:
Heat is the amount of the thermal energy contained in an object measured in joules. When heat energy is transferred to an object, the temperature of the object changes depending on the amount of heat applied and the type of object.
Given that:
mass of water (m) = 225 g, Temperature difference ([tex]\Delta T[/tex]) = 100°C - 20°C = 80°C, Water’s specific heat capacity ([tex]c_p[/tex]) = 4.184 J/g°C
The quantity of heat (Q) is given as:
[tex]Q=mc_p\Delta T[/tex]
[tex]Q= 225g *4.184J/g^0C*80=75312J=75.312KJ[/tex]
The amount of heat in joules required to raise the temperature of 225 g of water from 20.0 °C to 100 °C is calculated using the heat equation q=mcΔT. After substituting appropriate values, we get the result as 75.3 kJ.
Explanation:To calculate the amount of heat required to raise the temperature of 225 g of water from 20.0 °C to 100 °C, we can use the heat equation q = mcΔT where 'm' is the mass of the water, 'c' is the specific heat capacity of water, and 'ΔT' is the change in temperature.
Here, m = 225 g (the mass of the water), c = 4.184 J/g °C (the specific heat capacity of water), and ΔT = 100 °C - 20 °C = 80 °C (the change in temperature).
Hence, q = mcΔT = (225 g) × (4.184 J/g °C) × (80 °C) = 75312 J or 75.3 kJ after rounding to 3 significant figures. Hence, the amount of heat in joules required to raise the temperature of 225 g of water from 20.0 °C to 100 °C is 75.3 kJ.
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Name three things you know about angiosperms
Answer:
Angiosperms are further classified as monocotyledonous and dicotyledonous plants. Cotyledons are the first leaves – the seed leaves – that a plant grows upon germination. The female reproductive organs of an angiosperm are the stigma, style and the ovary which are collectively known as the carpel.
Explanation: