which of these is an example of a base?group of answer
a)HCl
b)Ca(OH)2
c)CH3COOH
D)H2SO4

Answer:

0.967mole

Explanation:

Given parameters:

Volume of NH₄Cl  = 21.67L

Unknown:

Number of moles  = ?

Solution:

If we assume that the volume was taken at standard temperature and pressure,

 Then;

  Number of moles  = \(\frac{volume }{22.4L}\)  

 Number of moles  = \(\frac{21.67}{22.4}\)   = 0.967mole

Answer:

2Co + 3F2 --> 2CoF3

Explanation:

When balancing an equation we need to ensure that the products used equal the reactants produced. Hence to balance the equation we need 3 F2 molecules so we have 6F atoms in total. and since 1 Co molecule bonds to 3 F molecules. We are gonna need to 2 Co molecules.

Answer:

A slump is a form of mass wasting that occurs when a coherent mass of loosely consolidated materials or a rock layer moves a short distance down a slope.[1] Movement is characterized by sliding along a concave-upward or planar surface. Causes of slumping include earthquake shocks, thorough wetting, freezing and thawing, undercutting, and loading of a slope.

Answer:

I don't know if this is helpful. I'm sorry if it is not.

Answer:

2.7 g/mL

Explanation:

Density = mass/volume

To find the mass, we subtract the new water volume by the original water volume

15.46 - 10 = 5.46

The volume of the aluminum is 5.46 mL

We already got the mass of aluminum, 14.74

Now we just divide mass by volume to find the density

14.74 ÷ 5.46 = 2.699633

Wine was produced 37 years ago (1984 as usual year 15,2021) that is shown in the calculations below.

Reaction rate is calculated using the formula rate = Δ[C]/Δt, where Δ[C] is the change in product concentration during time period Δt. The rate of reaction can be observed by watching the disappearance of a reactant or the appearance of a product over time.

The time can be represented as follows:

t= 2.303\∧ log A0/A

∧= 0.693/t 1/2

The rate of a reaction is proportional to the reciprocal of the time taken. Rate α 1 time Rate is inversely proportional to time. Units: s-1, min-1 etc.

The given parameters are as follows:

t1/2=12.3

A0=5.5

A=0.688

t= 2.303/(0.693/12.3) log (5.5/0.688)

t=36.9

t=37 years

Thus, wine was produced 37 years ago (1984 as usual year 15,2021)

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The mystery element that remains solid at room temperature and also breaks very easily is a :  Non-metal  ( B )

A non metal is non conducting element at room temperature, which can be in gas, sold and liquid forms at room temperature, when in solid form they can break easily and do not bend as well. Non-metals are poor conductors of heat and electricity therefore will not conduct electricity when placed in a circuit. An example of a solid non-metal is Carbon.

Hence we can conclude that the mystery element is a Non-metal

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Answer:

brittle is not a characteristic of medals.

Answer: 204 L

Explanation:

According to ideal gas equation:

\(PV=nRT\)

P = pressure of gas = 0.262 atm

V = Volume of gas = ?

n = number of moles = \(\frac{\text {given mass}}{\text {molar mass}}=\frac{11.7g}{4g/mol}=2.92\)

R = gas constant =\(0.0821Latm/Kmol\)

T =temperature =\(-50^0C=(273+(-50))K=223K\)

\(V=\frac{nRT}{P}\)

\(V=\frac{2.92\times 0.0820 L atm/K mol\times 223K}{0.262atm}=204L\)

Thus volume occupied by 11.7 g of Helium in a balloon is 204L

The molar ratio of citric acid to sodium hydroxide is 1:3.

When answering questions on Brainly, a question-answering bot should always be factually accurate, professional, and friendly. The bot should be concise and not provide extraneous amounts of detail. The bot should also use the following terms in its answer if required by the question.Here is an answer to the given question:

What is the molar ratio of citric acid to sodium hydroxide (refer to the reaction equation)?The chemical equation for the reaction between citric acid and sodium hydroxide is given below:3 NaOH + H3C6H5O7 → Na3C6H5O7 + 3 H2OCitric acid reacts with sodium hydroxide in the ratio of 1:3. Therefore, for every 1 mole of citric acid, 3 moles of sodium hydroxide react.  

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The first radioiodine isotopes to be used to treat thyrotoxicosis were iodine-130 and iodine-131 in 1941, and thyroid cancer was added to their list of uses in 1943.

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Answer:

dic

Explanation:

Answer:

Equation 2, because K being more reactive, exchanges position with Pb in PbNO3.

Explanation:

Equation 2, because K being more reactive, exchanges position with Pb in PbNO₃. PbNO₃ + KI reaction can be used to extract lead metal from lead nitrate solution. Therefore, option A is correct.

The chemical element lead has the atomic number 82 and the letter Pb for its symbol. It is a dense, hefty metal that is heavier than the majority of everyday materials. Lead is pliable and soft, and it also has a low melting point. Lead has a tinge of blue when it is first cut, and it is bright and gray. When exposed to air, it tarnishes to a drab gray tone.

Lead is still often used in a variety of products, including some solders, lead crystal glass, pigments, ammunition, cable sheathing, lifting and diving weights, and weight belts. Corrosive liquids are frequently stored in it.

The chemical element lead has the atomic number 82 and the symbol Pb. Lead is a solid at normal temperature and is categorized as a post-transition metal.

Therefore, option A is correct.

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The hydroxide ion concentration of the solution is 9.5 × 10⁻⁴.

The hydroxide ion concentration can be calculated by using the expression of pOH and pH. As the pH of the solution is 10.94, the pOH of the solution can be calculated as:

pOH + pH = 14  

pOH = 14 - 10.94

pOH = 3.06T

he expression of pOH is given as:

pOH = - log[OH-]

The OH- concentration can be calculated as:

[OH-] = 10 -pOH

[OH-] = 10 - 3.06[OH-] = 9.5 × 10⁻⁴

The hydroxide ion concentration of the solution is 9.5 × 10⁻⁴.

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Answer:

diffusion

Explanation:

Diffusion can be defined as the net movement of particles from a high concentration to a low concentration. This sounds like the most plausible word in this case.

Answer:

The average speed is = 11.1m/s

Explanation:

Recall that average speed is defined as the total distance traveled with respect to the total number of time, therefore we say that the total distance traveled is 40Km according to your question, remember, the unit of speed is metre per second, so you change 40km by multiplying it with 1000, recall that, 1000m = 1km, so 40km×1000m = 40,000m, also 1h= 60×60, =3600s

Remember the formula for average speed is = Total distance traveled÷ total time taken

Thus; 40000m/3600s

Then we had, 11.1m/s...

You can ask questions

Answer:

I'm pretty sure the answer Is c because I think I remember doing something like that so yeah

The percent yield of reaction is calculated as 83.67%, which implies that 83.67% of expected amount of Baso was actually produced.

The actual yield divided by theoretical yield times 100 is percent yield.

Theoretical yield of Baso will be calculated as :

As, we know, molar mass of Baso = 234.17 g/mol

So, now moles of Baso is (45.8 g Baso) / (234.17 g/mol) = 0.196 mol Baso

Actual yield of Baso will be:

As we know,  molar mass of Baso = 234.17 g/mol

So, now moles of Baso is (38.4 g Baso) / (234.17 g/mol) = 0.164 mol Baso

As we know, Percent yield is (Actual yield/Theoretical yield) x 100

= (0.164  / 0.196 ) x 100

So, the Percent yield is 83.67%

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Answer: monki says d

Explanation: monki big brain oof

Answer:

d

Explanation:

The rate constant for decay is 6.3054 * 10^-3 /min.

A radionuclide (radioactive nuclide, radioisotope, or radioactive isotope) is an unstable nuclide with excess nuclear energy. This surplus energy can be expelled as gamma radiation from the nucleus, transferred to one of the electrons and released as a conversion electron, or utilized to build and emit a particle (alpha particle, beta particle) from of the nucleus.

The radionuclide has been said to undergo radioactive decay throughout these activities. Because they are powerful enough to free an electron from some other atom, these emissions are classified as ionising radiation. Radioactive decay can either yield a stable nuclide or a new unstable radionuclide that can then decay further. At the atomic level, radioactive decay is a random process: it is impossible to anticipate when one individual atom will decay.

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Answer: 51.6667c    324.817K

Explanation:

125°F temperature in degrees Celsius is 51.67  °C and in kelvins is 324.67 kelvin.

Temperature is a bodily amount that expresses the hotness of a count number or radiation. There are 3 kinds of temperature scales.

Temperature is the diploma or depth of the warmth present in a substance or a machine, expressed primarily based on the comparative scale and proven by a thermometer. In other phrases, Temperature is the degree of hotness or coldness of a frame measured by the usage of Celsius, Kelvin, and Fahrenheit scales.

Temperature is measured with thermometers. commonplace thermometers include a tumbler rod with a totally skinny tube in it. The tube carries a liquid that is furnished from a reservoir, or "bulb," at the base of the thermometer. every now and then the liquid is mercury, and every so often it is pink-colored alcohol.

To convert °C into Fahrenheit:-

F = 9/5 °C + 32

°C = (F - 32)× 5/9

    = (125 -32) × 5/9

    = 93 × 5/9

     = 51.67  °C

°C into Kelvin:-

K= °C  + 273

k =  51.67 + 273

   = 324.67 kelvin.

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Answer:

An atom contains equal numbers of protons and electrons .

The properties of wire of the fuse are given below:

1) Low melting point

2) high conductivity

3) Low ohmic loss

4) Free from Detraction

I hope it will help you

The reaction between sodium (Na) and chlorine gas (Cl2) results in the formation of sodium chloride (NaCl), with the transfer of one electron.

In the given reaction, two atoms of sodium (Na) react with one molecule of chlorine gas (Cl2) to form two molecules of sodium chloride (NaCl). During the reaction, each sodium atom loses one electron and transfers it to the chlorine atom.

This electron transfer leads to the formation of positively charged sodium ions (Na+) and negatively charged chloride ions (Cl-), which then combine to form a solid crystal lattice of sodium chloride. Therefore, the correct answer is that one electron is transferred during the reaction.

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Water intoxication occurs when A. The body’s electrolytes are out of balance.

The major effect of the process of Water intoxication in the human body is to produce homeostatic unbalance, which is followed by the presence of abnormal electrolyte levels in the blood and it has a toxic effect on our health.

Therefore, with this data, we can see that the effect of the process of Water intoxication in the human body is to change electrolyte concentration.

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Answer:

they are produced by the body in response to the presence of foreign substance

Answer:

Electric field is how much electric force is being but out per unit charge

Explanation:

Answer:

To determine how much of a chemical to order, the assistant manager should analyze the lab's historical usage data, consider the lead time, and account for any storage limitations or shelf life concerns. Effective communication with the supplier can also provide valuable insights for optimizing the order quantity.

To determine how much of a specific chemical to order, the assistant manager of the lab needs to consider the lead time, which in this case is two weeks.

First, the assistant manager should analyze the usage of the chemical in the lab. This involves reviewing the historical data on how much of the chemical is typically consumed within a given time period, such as a week or a month. By understanding the average usage rate, the assistant manager can estimate the quantity needed for a specific duration.

For example, let's say the lab typically uses 10 liters of the chemical per week. With a lead time of two weeks, the assistant manager would need to order enough to cover the lab's needs for the next two weeks plus a safety stock to account for any unexpected increases in demand or delays in delivery.

To calculate the order quantity, the assistant manager can multiply the average weekly usage by the lead time. In this case, 10 liters per week multiplied by two weeks would result in an order quantity of 20 liters.

However, it's important to consider factors such as storage capacity and shelf life. If the lab has limited storage space or the chemical has a short shelf life, ordering a larger quantity may not be feasible. In such cases, the assistant manager might need to adjust the order quantity accordingly.

Additionally, the assistant manager should communicate with the supplier to check for any minimum order quantities or discounts offered for bulk purchases. This information can help optimize the order quantity and potentially reduce costs.

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The iron has become part of a A. compound with the sulfate, which must be separated through chemical methods.

Iron (II) sulfate is also referred to as ferrous sulfate is a reducing agent. The hydrates form is used for the treatment of iron deficiency.

It should be noted that a chemical change is involved in the formation of iron (II) sulfate. It can't be separated by physical means and isn't reversible.

In this case, iron (II) sulfate will be separated by chemical methods.

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Iron sulfate is a compound which can be separated through chemical methods.

Iron is present in a compound form with the sulfate, which must be separated through chemical methods because both iron and sulfate reacts with each other through making of chemical bonds with each other. Those elements that combine with each other chemically at a fix ratio can be separated from each other through chemical methods.

While on the other hand, in mixture substances combine with each other physically so they can be separated from each other through physical methods so we can conclude that iron sulfate is a compound which can be separated through chemical methods.

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