Answer:
I can conclude practice was cancelled on Thursday
Explanation:
Since the sentence says "If it rains, practice is cancelled that day" since its raining on Thursday, practice is cancelled for Thursday
hope this helps :)
an unknown weak acid with a concentration of 0.095 m has a ph of 1.80. what is the ka of the weak acid?
The Ka of the unknown weak acid is approximately 5.01 x 10^-2, calculated from the given pH value using the Henderson-Hasselbalch equation
The pH of a solution can be related to the Ka of a weak acid using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base and [HA] is the concentration of the weak acid.
In this case, the pH is given as 1.80, indicating that the concentration of H+ ions is 10^(-1.80) M. Since the weak acid is in excess, we can assume that [HA] ≈ [A-]. Therefore, we can rewrite the Henderson-Hasselbalch equation as: pH = pKa + log([HA]/[HA]) = pKa.
By substituting the given pH value into the equation, we can calculate the pKa, and then convert it to Ka by taking the antilog.
The Ka of the unknown weak acid is approximately 5.01 x 10^-2, calculated from the given pH value using the Henderson-Hasselbalch equation.
To know more about pH, visit : brainly.com/question/13265081
#SPJ11
a u.s. one dollar coin is made of copper, zinc, manganese, and nickel in the following ratio: 44 : 3 : 2 : 1.its mass is 8 grams. how many grams of each element are in a one dollar coin? angle.
The coin has a mass of 8 grams, and it was found that the coin is made up of 7.04 grams of copper, 0.48 grams of zinc, 0.32 grams of manganese, and 0.16 grams of nickel.
A U.S. one dollar coin is made up of copper, zinc, manganese, and nickel in the ratio 44:3:2:1.
The coin has a mass of 8 grams, and we are required to find the number of grams for each element in a one-dollar coin. Let us start by finding the mass of each element in the coin as follows:
Manganese: (2 / 50) * 8 = 0.32 grams
Nickel: (1 / 50) * 8 = 0.16 grams
Copper: (44 / 50) * 8 = 7.04 grams
Zinc: (3 / 50) * 8 = 0.48 grams
Thus, a U.S. one-dollar coin is made of 7.04 grams of copper, 0.48 grams of zinc, 0.32 grams of manganese, and 0.16 grams of nickel.
In conclusion, A U.S. one-dollar coin is made of copper, zinc, manganese, and nickel in the ratio 44:3:2:1 and their mass in gram is in the ratio of 7.04:0.48:0.32:0.16 respectively.
to know more element visit:
brainly.com/question/30858299
#SPJ11
Calculate the volume of CaCl2 stock solution. Express your answer with the appropriate units. Volume-14.5 mL Ans Correct Part B How to prepare this solution? O Using a 25 mL graduated cylinder, measure out 14.5 mL of 2.65 M CaCl2 solution. Pour the 14.5 mL into a 250 mL volumetric flask and fill it to the mark with water. Mix 14.5 mL of water and 235.5 mL of CaCl2. Mix 14.5 mL of water and 250 mL of CaCl2. O Using a 25 mL graduated cylinder, measure out 14.5 mL of 2.65 M CaCl2 solution. Pour the 14.5 mL into a 250 mL volumetric flask and add 250 mL of water.
Using a 25 mL graduated cylinder, measure out 14.5 mL of the 2.65 M CaCl2 solution. Pour the 14.5 mL into a 250 mL volumetric flask and add water to reach the mark on the flask.
Following the procedure will result in the desired CaCl2 solution with a volume of 14.5 mL.
To prepare the CaCl2 solution with a volume of 14.5 mL, the following steps should be followed:
Step 1: Obtain a 25 mL graduated cylinder.
Step 2: Measure out 14.5 mL of a 2.65 M CaCl2 solution using the graduated cylinder.
Step 3: Pour the 14.5 mL of the CaCl2 solution into a 250 mL volumetric flask.
Step 4: Add water to the volumetric flask to reach the mark on the flask.
The correct procedure to prepare the solution is:
This method ensures the accurate preparation of the desired volume and concentration of the CaCl2 solution. The volumetric flask provides a precise measurement for the final volume, and adding water to the mark ensures the solution is diluted correctly.
It is important to note that the final volume of the solution is 250 mL, which is obtained by adding water to the 14.5 mL of the CaCl2 solution. The final concentration of the solution will be determined by the initial concentration of the CaCl2 solution and the dilution factor, which in this case is 14.5 mL divided by 250 mL.
Learn more about solution at: brainly.com/question/28945073
#SPJ11
N₂ + 3H2 → 2NH3
The most efficient ratio for the reaction is
1 N2 : 3 H2.
Which set of reactants will be the most
efficient (least wasteful of materials) for
the reaction?
Answer:
Its a combination reaction
Its B
Which is smaller, Se, or O?
Answer:
Oxygen is much smaller then Selenium, that is because of how high the charge density is.
Answer:
If you mean electron then O(8 electrons) is smaller than Se(34 electrons).
If you mean atomic mass then O(16) is still smaller than Se(78).
If Valency then O and Se are the same(-2).
A chemist set up a synthesis of phosphorus trichloride by reacting 12.0 grams of phosphorus with 35.0 grams of Cl2. 42.4 grams of phosphorus trichloride was produced. Calculate the percent yield of this compound.
Answer:
sorry i do not know
Explanation:
i do not know the answer you are asking sorry i was never really good in maths anyway
Which two statements are true for both compounds and mixtures?
[]A. Their particles are held together by chemical bonds
[]B. They are made up of more than one type of atmos
[]C. They can be separated into two or more elements
[]D. Their particles all have the same chemical formula
Answer:
B and C
Explanation:
Taking up space, need 20 characters to send
Answer:
hiiiiii-
Explanation:
how yall doing-
an exothermic reaction releases 325,000 calories. convert this to kj
The exothermic reaction releases approximately 1,359,400 kilojoules of energy.
To convert calories to kilojoules, we can use the conversion factor:
1 calorie = 4.184 kilojoules
Given that the exothermic reaction releases 325,000 calories, we can convert it to kilojoules:
325,000 calories * (4.184 kilojoules / 1 calorie) = 1,359,400 kilojoules
Therefore, the exothermic reaction releases approximately 1,359,400 kilojoules of energy.
To know more about exothermic refer here
https://brainly.com/question/4345448#
#SPJ11
If 87.5 percent of a sample of pure 131I decays in 24 days, what is the half-life of 131I? (A) 6 days (B) 8 days (C) 12 days (D) 14 days
The half-life of a radioactive substance is the amount of time it takes for half of the atoms in a sample to undergo decay. In this case, we are given that 87.5% of a sample of pure 131I decays in 24 days.
Let's assume we start with a sample of 100 atoms of 131I. After 24 days, 87.5% of these atoms decay, which means 87.5 atoms remain. Therefore, we can calculate the remaining atoms after each 24-day interval as follows:
After 24 days: 87.5 atoms remaining
After 48 days: 87.5 * 87.5% = 76.56 atoms remaining (rounded to two decimal places)
After 72 days: 76.56 * 87.5% ≈ 66.92 atoms remaining (rounded to two decimal places)
We can see that after each 24-day interval, the number of remaining atoms decreases by approximately 87.5%. This indicates that the half-life of 131I is approximately 24 days.
The closest option to a half-life of 24 days is option (C) 12 days. However, none of the given options exactly matches the calculated half-life.
To know more about atoms visit :
https://brainly.com/question/26952570
#SPJ11
Why is the sun yellow?
Answer:
The sun is not yellow.
Explanation:
sun can look yellow or red whenever we see the sunlight at sunrise or sunset, when it becomes low on the horizon. That's only how the wavelengths of the low frequency (green , blue, magenta) are dispersed across the planet's crust, just as the tiny waves are distributed along the sea by huge rocks.
Answer:
Its because of the Earth's atmosphere | The sun is a yellow dwarf star | If you saw the sun from space, it would actually look white
Explanation:
Which event is an example of vaporization?
A. Water drips from an icicle on the edge of a roof.
B. A mirror fogs up when someone takes a hot shower.
C. Wet clothes are drying on a clothesline.
D. Snow turns to rain.
In a science lab, burning steel wool creates only iron oxide. What must be true?
A
The reaction of burning steel wool can sometimes create carbon monoxide.
B
The reaction of burning steel wool will sometimes create iron oxide and water.
с
The reaction of burning steel wool is not endothermic or exothermic.
D
The reaction of burning steel wool always creates iron oxide.
Answer:
D
Explanation:
The reaction of burning steel wool always creates iron oxide.
Burning steel wool always produce iron oxide and the ash or carbon because it is made up of iron and carbon.
What is steel wool?Steel wool is a bundle of thin flexible sharp edged steel filaments also called iron wool. It is mainly used to make scrub pads used to clean surfaces of materials. The scrubbers we all use in kitchen is made of these steel wool.
Iron containing substances when burned in air forms iron oxide. This iron oxide is what we call as rust as the product of corrosion. Steel is made of iron, carbon and other metals in trace amounts.
It is made of steel filaments and thus contains iron, carbon and traces of other metals. Steel wool shows metallic luster and ductility. When it is burned, iron oxide is produced. Hence option D is correct.
To know more about steel wool, refer the link below:
https://brainly.com/question/18849459
#SPJ5
a certain amount of hydrogen peroxide was dissolved in 100. ml of water and then titrated with 1.68 m kmno4 . what mass of h2o2 was dissolved if the titration required 17.8 ml of the kmno4 solution?
The balanced chemical equation for the reaction between hydrogen peroxide and potassium permanganate is: 5 H2O2 (aq) + 2 KMnO4 (aq) + 3 H2SO4 (aq) K2SO4 (aq) + 2 MnSO4 (aq) + 8 H2O (l) + 5 O2 (g). The stoichiometry of the reaction shows that 5 moles of H2O2 reacts with 2 moles of KMnO4, resulting in 0.407 g.
The balanced chemical equation for the reaction between hydrogen peroxide and potassium permanganate is:
5 H2O2 (aq) + 2 KMnO4 (aq) + 3 H2SO4 (aq) → K2SO4 (aq) + 2 MnSO4 (aq) + 8 H2O (l) + 5 O2 (g)
Given that a certain amount of hydrogen peroxide was dissolved in 100. ml of water and then titrated with 1.68 M KMnO4. If the titration required 17.8 ml of the KMnO4 solution,
we can calculate the mass of H2O2 that was dissolved using the stoichiometry of the reaction. Stoichiometry of the reaction:5 moles of H2O2 reacts with 2 moles of KMnO4From the given information, we have:Molarity of KMnO4 solution (M) = 1.68 M Volume of KMnO4 solution (V) = 17.8 mL = 0.0178 LThe number of moles of KMnO4 solution used in the titration = Molarity of KMnO4 solution × Volume of KMnO4 solution= 1.68 M × 0.0178 L= 0.0299 molesFrom the stoichiometry of the reaction:5 moles of H2O2 reacts with 2 moles of KMnO4The number of moles of H2O2 can be calculated as:
Number of moles of H2O2 = (2/5) × Number of moles of KMnO4
= (2/5) × 0.0299 moles
= 0.01196 moles
The mass of H2O2 can be calculated using its molar mass:Molar mass of H2O2 = 34.014 g/molMass of H2O2 = Number of moles of H2O2 × Molar mass of H2O2= 0.01196 moles × 34.014 g/mol= 0.407 gHence, the mass of H2O2 that was dissolved is 0.407 g.
To know more about balanced chemical equation Visit:
https://brainly.com/question/14072552
#SPJ11
the compound sodium sulfate is soluble in water. when this compound dissolves in water, which ion listed below would be present in solution? group of answer choices so42- s2- o2- na22
When sodium sulfate (Na2SO4) dissolves in water, the ions present in the solution are Na+ and SO42-.
Sodium sulfate (Na2SO4) dissociates into its ions when it dissolves in water due to the strong attraction between the positive and negative charges of the ions and the water molecules. In the case of sodium sulfate, each Na+ ion is attracted to water molecules through ion-dipole interactions, and each SO42- ion is surrounded by water molecules through ion-dipole interactions as well.
The sodium ion (Na+) is formed when the sodium atom loses one electron, resulting in a +1 charge. This cation is soluble in water and remains in solution as Na+ ions.
The sulfate ion (SO42-) is formed when the sulfur atom combines with four oxygen atoms, and it carries a -2 charge. This anion is also soluble in water and remains in solution as SO42- ions.
Therefore, when sodium sulfate dissolves in water, the ions present in the solution are Na+ and SO42-. The presence of these ions allows the compound to be soluble in water and form a homogeneous solution.
To learn more about ion-dipole interactions click here: brainly.com/question/30642064
#SPJ11
True or False. Isotopes have different chemical properties. Explain why?
Answer:
False
Explanation: isotopes generally have the same physical and chemical properties because they have the same numbers of protons and electrons.
What is the difference between a Group/Family and a period on the Periodic Table?
Answer:
a group is a vertical row and a family is a horizontal row
Explanation:
The groups or families are the vertical columns of the periodic table due to their similar chemical behavior.
The members of a family of elements have the same number of valence electrons, chemical properties. The horizontal rows called as period.
What are the properties of periodic table ?Periodic table is tabular representation of the elements with increasing order by their atomic number and these are arranged in groups based on similar properties.
chemical Elements of the periodic table are arranged from left to right and top to bottom with respect to increasing atomic numbers.
Elements in the same group of the periodic table which have the same valence electron configuration and same chemical properties while elements have an increasing order of valence electrons.
For more details regarding periodic table , visit:
brainly.com/question/11155928
#SPJ2
What are two examples of objects with low friction?
Answer:
A washing machine pushed along a floor.
An iron being pushed across material.
a student knows he has 2.5 mol of iron. he also knows avogadro's number. what must he do to these two numbers to find the number of iron atoms in the sample?select one:a.subtract them.b.divide them.c.add them.d.multiply them.
d. Multiply them. this is correct answer.
To find the number of iron atoms in the sample, the student must multiply the number of of iron by Avogadro's number.
what is atoms?
Atoms are the fundamental building blocks of matter. They are the smallest unit of a chemical element that retains the chemical properties of that element. Atoms consist of a nucleus, which contains protons and neutrons, and electrons that orbit around the nucleus. Different elements have different numbers of protons in their nuclei, giving them unique atomic numbers and distinct chemical properties. Atoms can combine together through chemical reactions to form molecules and compounds.
To know more about protons visit:
brainly.com/question/12535409
#SPJ11
An atom has 14 protons and 15 neutrons. Write the 2 versions of the symbol for this isotope.
Answer:
[tex]\left 29 \atop 14 \right Si[/tex]
Si - 29
Explanation:
Atomic mass = # of protons + # of neutrons
# of protons = element number and type
the reaction
CO2(g) + C(s) (------) 2CO(g) has Kp=5.78 at 1200K
calculate the total pressure at equilibrium when 4.45 gof CO2 is introduced into a 10.0L container and heated to 1200K in the presence of 2.00 g of graphite.
The total pressure at equilibrium, when 4.45 g of CO2 is introduced into a 10.0 L container along with 2.00 g of graphite and heated to 1200 K, can be calculated as 8.64 atm.
To calculate the total pressure at equilibrium, follow these steps:
Convert the masses of CO2 and C to moles.
Use the ideal gas law to calculate the initial partial pressures of CO2 and C.
Apply the equilibrium constant expression to determine the partial pressure of CO at equilibrium.
Calculate the partial pressures of CO2 and C at equilibrium.
Calculate the total pressure at equilibrium by summing the partial pressures.
By plugging in the given values and following the steps, the total pressure at equilibrium is calculated to be 8.64 atm.
Note: The specific calculations are omitted here for brevity, but following the outlined steps will yield the desired result.
Learn more about the ideal gas law here: brainly.com/question/30458409
#SPJ11
.Aluminum sulfate, Al2(SO4)3, is used in some antiperspirants.
A. How many moles of sulfur are present in 2.0 moles of Al2(SO4)3?
Express the number of moles to two significant figures.
B. How many moles of aluminum ions are present in 0.48 moles of Al2(SO4)3?
Express the number of moles to two significant figures.
C. How many moles of sulfate ions (SO42−) are present in 1.7 moles of Al2(SO4)3?
The number of moles of sulfur in 2.0 moles of Al2(SO4)3 is 6.0 moles, the number of moles of aluminum ions in 0.48 moles of Al2(SO4)3 is 0.96 moles, and the number of moles of sulfate ions in 1.7 moles of Al2(SO4)3 is 5.1 moles.
To determine the number of moles of a specific element or ion in a compound, we need to use the coefficients from the balanced chemical formula.
In the case of aluminum sulfate (Al2(SO4)3), we can calculate the moles of sulfur, aluminum ions, and sulfate ions using the given moles of Al2(SO4)3 and the stoichiometric ratios.
A. To find the number of moles of sulfur (S) in 2.0 moles of Al2(SO4)3, we use the stoichiometric ratio between Al2(SO4)3 and S. From the balanced chemical formula, we see that there are three sulfur atoms per one Al2(SO4)3 unit. Therefore, the number of moles of sulfur is 2.0 moles × 3 moles of S / 1 mole of Al2(SO4)3 = 6.0 moles of S.
B. To determine the moles of aluminum ions (Al3+) in 0.48 moles of Al2(SO4)3, we use the stoichiometric ratio between Al2(SO4)3 and Al3+. From the formula, we see that there are two aluminum ions per one Al2(SO4)3 unit. Therefore, the number of moles of aluminum ions is 0.48 moles × 2 moles of Al3+ / 1 mole of Al2(SO4)3 = 0.96 moles of Al3+.
C. To calculate the moles of sulfate ions (SO42-) in 1.7 moles of Al2(SO4)3, we use the stoichiometric ratio between Al2(SO4)3 and SO42-. From the formula, we see that there are three sulfate ions per one Al2(SO4)3 unit. Therefore, the number of moles of sulfate ions is 1.7 moles × 3 moles of SO42- / 1 mole of Al2(SO4)3 = 5.1 moles of SO42-.
To learn more about moles click here:
brainly.com/question/15209553
#SPJ11
Definition: this is the substance(s) formed in a chemical reaction
Example: found on the right side of the arrow in a chemical equation
Hint: First two letters (pr)
which of these should be avoided if the aim is to effectively neutralize viral particles? question 7 options: alcohols metals alkylating agents strong detergents
It is important to use disinfectants that do not contain alkylating agents when neutralizing viral particles to prevent further spread of the infection. Alkylating agents can damage DNA and cause the virus to mutate and become resistant to treatment, so it is important to use disinfectants that do not contain alkylating agents.
The aim of effectively neutralizing viral particles is to avoid the use of alkylating agents. Alkylating agents are substances that can cause damage to DNA by adding alkyl groups to the DNA molecule. This can lead to damage of the viral genetic material, which can cause the virus to mutate and become resistant to treatment. To effectively neutralize viral particles, it is important to use disinfectants that do not contain alkylating agents. This is because alkylating agents can damage the viral genetic material, which can cause the virus to mutate and become resistant to treatment.
To know more about alkylating agents Visit:
https://brainly.com/question/9458662
#SPJ11
which of the statements regarding beta particles are true? beta particles have a mass number of 0. beta-particle formation is accompanied by the conversion of a proton into a neutron. beta particles have an atomic number of 1. beta-particle formation is accompanied by the conversion of a neutron into a proton.
The statement that is true regarding beta particles is D. "Beta-particle formation is accompanied by the conversion of a neutron into a proton."
Beta particles are high-energy electrons or positrons that are emitted during certain types of radioactive decay processes. Beta decay occurs when an unstable nucleus undergoes a transformation in order to reach a more stable state. In beta-minus decay, a neutron in the nucleus is converted into a proton, releasing a beta particle (high-energy electron) and an antineutrino. The conversion of a neutron into a proton increases the atomic number of the nucleus by one.
The statement that beta particles have a mass number of 0 is incorrect. Beta particles do have mass, although they are much less massive compared to protons or neutrons. Similarly, the statement that beta particles have an atomic number of 1 is incorrect. The atomic number refers to the number of protons in an atom, and beta particles are not atoms themselves. Beta particles are high-energy particles emitted from the nucleus during beta decay.
Therefore, the only true statement regarding beta particles is that their formation is accompanied by the conversion of a neutron into a proton, which leads to an increase in the atomic number of the nucleus. Therefore, Option D is correct.
which of the statements regarding beta particles are true?
A. beta particles have a mass number of 0.
B. beta-particle formation is accompanied by the conversion of a proton into a neutron.
C. beta particles have an atomic number of 1.
D. beta-particle formation is accompanied by the conversion of a neutron into a proton.
Know more about beta particles here:
https://brainly.com/question/24312947
#SPJ8
When benzoic acid C6H5COOH and magnesium hydroxide are mixed, water and magnesium benzoate are produced.
When benzoic acid (C₆H₅COOH) and magnesium hydroxide are combined, they undergo a chemical reaction to produce water and magnesium benzoate.
This reaction is known as an acid-base reaction or neutralization reaction. In this reaction water and magnesium benzoate, a salt, are produced.
The main purpose of this reaction is to neutralize the acidic properties of benzoic acid by reacting it with the basic properties of magnesium hydroxide.
In the reaction, the carboxylic acid group (-COOH) in benzoic acid donates a proton (H+) to the hydroxide ion (OH-) in magnesium hydroxide.
This proton transfer results in the formation of water (H₂O) as a byproduct.
The remaining components, the magnesium cation (Mg2+) and the benzoate anion (C₆H₅COO-), combine to form magnesium benzoate (Mg(C₆H₅COO)₂).
The reaction can be represented by the following chemical equation:
C₆H₅COOH + Mg(OH)₂ → H₂O + Mg(C₆H₅COO)₂
This reaction has various applications in industries such as pharmaceuticals, food preservation, and cosmetics, where the neutralization of acidic compounds is required.
To know more about pharmaceuticals, visit:
https://brainly.com/question/31718381
#SPJ11
Earth's structure has been compared to the structures of a variety of familiar objects, including fruits such as melons, apples, and peaches. Choose a fruit or other object that could model Earth's structure. Describe ways that the object represents Earth accurately, as well as its limitations as a model.
Answer:
Understanding the interior structure of the Earth can be a challenging
skill for many concrete learners to master, due to the inability to experience these
structures first hand and typically seeing them through images or diagrams. Handson learners can better learn about the basic structures of the Earth interior by
building models of these structures that they can see, touch, and interact with along
with exposure to familiar objects (such as fruit) that can be used to
represent/model the interior of our planet.
Procedure: Introduce a globe to students
Explanation:
Answer:
A boiled egg is an object that represents Earth accurately. A boiled egg and the Earth both have a brittle shell. The crust of the earth is broken into pieces, like the cracked shell of a hardboiled egg. The mantle of the earth is like the egg white, and the core of the earth lies in the center, like the egg yolk.
Explanation:
This is the correct answer I got a 100 on it. The other person's answer wasn't complete and didn't remember what they were comparing.
I hope my answer helps you!!!
Please mark my answer the Brainiest!!!
What would happen if the nuclear force was held by neutrons and electrons
Answer:
Explanation:
The nuclear force (or nucleon–nucleon interaction or residual strong force) is a force that acts between the protons and neutrons of atoms. Neutrons and protons, both nucleons, are affected by the nuclear force almost identically. Since protons have charge +1 e, they experience an electric force that tends to push them apart, but at short range the attractive nuclear force is strong enough to overcome the electromagnetic force. The nuclear force binds nucleons into atomic nuclei.
What kind of chemical reaction is this?
2K(I)+Pb(NO3)^2→2K(NO3)+Pb(I2)
Answer:
that would be a double replacement reaction
how many significant figures are in 0.0231?? a lot of points!!!
Answer:
3
Explanation:
Which of the following acids has the strongest conjugate base?
Question options:
HClO
HClO4
HClO2
HClO3
HCl
Among the given options, the acid with the strongest conjugate base is HClO4 (perchloric acid).
The strength of a conjugate base depends on the stability of the resulting anion after the acid donates a proton. A stronger acid will have a weaker conjugate base.
In this case, HClO4 (perchloric acid) is the strongest acid among the options. When it donates a proton, the resulting conjugate base is ClO4- (perchlorate ion). The perchlorate ion is highly stable and delocalizes the negative charge across the four oxygen atoms, making it a very weak base.
On the other hand, the other acids (HCl, HClO2, HClO3) will have relatively weaker conjugate bases compared to HClO4.
Therefore, among the given options, HClO4 (perchloric acid) has the strongest conjugate base.
Learn more about conjugate bases: brainly.com/question/30086613
#SPJ11
