If a drum skin vibrates with a frequency of 100 Hz, how many times does it move up and down each second?
( Chemistry )​

Answer:

#1: 0.00144 mmolHCl/mg Sample

#2: 0.00155 mmolHCl/mg Sample

#3: 0.00153 mmolHCl/mg Sample

Explanation:

A antiacid (weak base) will react with the HCl thus:

Antiacid + HCl → Water + Salt.

In the titration of antiacid, the strong acid (HCl)  is added in excess, and you're titrating with NaOH moles of HCl that doesn't react.

Moles that react are the difference between mmoles of HCl - mmoles NaOH added (mmoles are Molarity×mL added). Thus:

Trial 1: 0.391M×14.00mL - 0.0962M×34.26mL = 2.178 mmoles HCl

Trial 2: 0.391M×14.00mL - 0.0962M×33.48mL = 2.253 mmoles HCl

Trial 3: 0.391M×14.00mL - 0.0962M×33.84mL = 2.219 mmoles HCl

The mass of tablet in mg in the 3 experiments is 1515mg, 1452mg and 1443mg.

Thus, mmoles HCl /mg OF SAMPLE for each trial is:

#1: 2.178mmol / 1515mg

#2: 2.253mmol / 1452mg

#3: 2.219mmol / 1443mg

Answer:

Explanation:

Hello,

The question above requires us to classify certain properties which may either fall into physical or chemical properties of that matter.

Physical properties are properties which are of intrinsic value and has no influence on the chemical nature of the substance while chemical properties are those that influence the chemical nature of the substance.

Physical properties can be measured or calculated while chemical properties of a substance is very difficult to measure.

a). Silver has a shiny luster is an example of "physical property" because the shiny nature of silver has no chemical importance.

b). Silver metal has a density of 10.49 g/cm³ is also a "physical property" because density is a physical property of a material.

Density is ratio between mass and volume which are both physical properties since they can be measured.

c). Silver metal and Chlorine gas produce Silver chloride (AgCl) is a "chemical property" since it involves combining of two elements and they both lose their original chemical identity after the reaction.

d). Silver metal has a melting point of 1235°C is a "physical property"

e). Silver metal conducts electricity is a "chemical property" since conduction of electricity are done by the availability of mobile electrons in its electron cloud.

f) silver metal gives no reaction to acid is also an example of "chemical property"

On the basis of the physical and chemical property of a matter

A characteristic of a substance, which can be measured or observed without changing the identity of the substance is known as a physical property. It include:

On the other hand, a characteristic, which illustrates the tendency of a substance to go through a particular chemical change is termed as a chemical property.

Thus, on the basis of the classification a) phys,  b) phys,  c) chem, d) phys, e) phys and f) chem.

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Answer: 6.2cm

Explanation: because don’t forget it’s

Length • Width • Height

Neutron-to-proton ratios of at least and even numbers of protons and neutrons are characteristics of stable nuclei. It is common for particularly stable nuclei to have protons and neutrons in magic numbers.

A subatomic particle having a negative charge is an electron. A strong nuclear force keeps protons together in the nucleus of an atom. A particular subatomic particle without no charge is the neutron.

Neutrons are made up of one up quark and three down quarks. This "strong nuclear force," one of the four basic forces, keeps the nucleus together. Two more are gravity and electromagnetism.

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Answer:its a

Explanation: bc im just him

Explanation:

When a chlorine atom forms an ion, it gains electrons, making it negative.  A neutral chlorine will become a chlorine with a -1 charge.  When it gains an electron, the radius increases.

When a sodium atom forms an ion, it loses electrons, making it positive.  A neutral sodium will become a sodium with a +1 charge.  When it loses an electron, the radius decreases.

Xeriscaping is a landscaping approach that focuses on conserving water by using drought-tolerant plants and efficient irrigation techniques. The goal is to create a visually appealing and sustainable garden while minimizing water usage.

Successful xeriscaping projects involve several key elements. Firstly, careful plant selection is crucial, opting for species that can thrive in arid conditions without excessive watering. Mulching is used to reduce evaporation and retain soil moisture.

Proper soil preparation, such as improving drainage and adding organic matter, promotes healthier plant growth. Efficient irrigation systems, like drip irrigation or soaker hoses, deliver water directly to plant roots, minimizing wastage.

Additionally, controlling erosion through the use of retaining walls or terracing is important. Lastly, regular maintenance, including appropriate pruning and weed control, ensures the longevity and vitality of the xeriscape garden. Overall, a successful xeriscaping project harmonizes sustainable practices with a beautiful outdoor environment.

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Answer:

The answer to this question is True

The equation  in the question is: H+H → H + H Complete the equation by filling in the missing parts. missing part is  1 → H+H-2 → →3 → He.

The atomic number of hydrogen is 1, which means it has only one proton in the nucleus and one electron in its shell. Two hydrogen atoms react with each other to form helium. Helium has 2 protons and 2 neutrons in its nucleus and two electrons in its shell. Therefore, the equation is:

H + H → HeIt can be seen that:1. H + H (Reactants)

2. → (Yields or Reacts to form)

3. He (Product)Therefore, the tiles will be arranged as shown below: 1 → H+H-2 → →3 → He

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Answer: by boiling it

Explanation:

By boiling the sap to remove water, also to concentrate the sugar that makes maple syrup.

Answer:

4

Explanation:

Light refracts when it passes through something transparent at an angle so that eliminates the other 3.

or put differently

Light refracts whenever it travels at an angle into a substance with a different refractive index (optical density)

The general formula for calculating the equilibrium constant, K, of a chemical reaction is given by K = [products]^m/[reactants]^n. Here option A is the correct answer.

Where [products] and [reactants] are the concentrations of the products and reactants in the reaction mixture, respectively, raised to their respective stoichiometric coefficients, m, and n. The equilibrium constant is a measure of the position of the equilibrium of a chemical reaction, indicating the ratio of the concentrations of the products to the reactants at equilibrium.

A value of K greater than 1 indicates that the products are favored at equilibrium, while a value of K less than 1 indicates that the reactants are favored. A value of K equal to 1 indicates that the concentrations of the reactants and products are equal at equilibrium, and the reaction is said to be at equilibrium.

An equilibrium constant is an important tool in understanding chemical equilibria, and it can be used to predict the direction of a reaction, as well as to calculate the concentrations of reactants and products at equilibrium under different conditions. It is also useful in designing chemical processes and optimizing reaction conditions for the maximum yield of desired products.

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Answer:

compounds ok I think I can't anderstand good

Energy is released by the formation of chemical bonds, and energy is

absorbed when the bonds are broken.

A chemical reaction involves the formation of new compounds from

reactants . It involves the formation and breaking of bonds in the

elements.

Energy is released by the formation of chemical bonds and this type of

reaction is referred to as exothermic while energy is absorbed when the

bonds are broken and is referred to as an endothermic reaction.

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When the Carbon reacts with oxygen it produce CO₂. This can be depicted by the below equation.

C + O₂ → CO₂. By the given process, 57.2 g of CO₂ are produced.

It has been mentioned that when 15.6 g of C reacts with 52.1 g of O₂  , then 10.5 g of O₂ remains unreacted. It indicates that Carbon is the limiting reagent and hence the amount of CO₂ produced is based on the amount of Carbon burnt.

C + O₂ → CO₂

In the given equation , 1 mole of carbon reacts with the  1 mole of O₂ to produce 1 mole of CO₂.

In the case 15.6 g of Carbon reacts with 52.1 of O₂ to produce the  "x" g of CO₂.

No of moles of a substance = mass of  the substance/molar mass of  substance

No of moles of carbon = 15.6 /12= 1.3 moles

No of moles of O₂ = Mass of reacted O₂/Molar mass of O₂.

No of moles of O₂ = (Total mass of O₂ burned - Mass of unreacted O)/32

No of moles of O₂ = (52.1-10.5) ÷ 32 = 1.3 moles.

Hence as already discussed 1 mole of Carbon reacts with 1 mole of O₂ to produce 1 mole of CO₂. In this case 1.2 moles of carbon reacts with 1.3 moles of O₂ to produce 1.3 moles of CO₂.

Moles of carbon dioxide = Mass of CO₂ produced /Molar mass of CO₂

Mass of CO₂ produced(x) = Moles of CO₂ ×Molar mass of CO₂

Mass of CO₂ produced(x) = 1.3 x 44 =  57.2 g

Thus 57.2 g of CO₂ is produced.

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Answer:

I think A it looks to be the answer

Explanation:

sorry if wrong

In dynamic equilibrium conditions, the vapor pressure is unique, and the rate of vaporization and condensation are at equal rates. Thus, option b is accurate.

A dynamic equilibrium is a reaction state where the rate of the forward and the backward reaction are equal. In the above case, the vapourization and the condensation will occur simultaneously at the same rate.

The vapor pressure of the liquid to gas and vice versa has a distinctive value as the temperatures are different making the pressure change directly.

Therefore, option b. II and III are the correct options.

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The final mass concentration of salt in the solution in g/l is 36.06 g/L.

The mass concentration of the mixture of the two salt solutions is calculated as follows:

Concentration of solution 1 = 15 g/l

mass of salt in the 250 mL solution = 15 g/l * 250 mL * 1 L/1000 mL

mass of salt in the 250 mL solution = 3.75 g

Concentration of solution = 6% (m/v)

This means that in 100 mL solution, 6 g of salt in present.

In 1000 mL or 1 L solution, 60 g of salt will be present.

Hence, the concentration of solution = 60 g/L

mass of salt in the 220 mL solution = 60 g/l * 220 mL * 1 L/1000 mL

mass of salt in the 220 mL solution = 13.2 g

Total mass of salt in the mixture = 16.95 g

Total volume of solution = 470 mL

Final mass concentration of solution = 16.95 g / 470 mL * 1000 mL/L

Final mass concentration of solution = 36.06 g/L

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Answer: Pb(NO3)2(aq) + 2KI(aq)  —> PbI2(s) + 2KNO3(aq)

Explanation:

Answer:

I'm pretty sure the answer is C.

Answer:

A

Explanation:

I sad A because water is changeable doesn't have fixed shape or volume water depend on the area or the temperature or other things .

The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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The volume of \(N_2O_5\) needed to produce 9.64 L of \(NO_2\) is 4.97 L, calculated using stoichiometry and the ideal gas equation.

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Answer:

Clouds

Explanation:

The cloud among the given options would be visible only when the light from a different source reflects outside it. This is due to the reason as we are able to see the clouds only when the sun reflects it's light on it and we can witness it by not seeing the clouds in the sky on a shady day. Thus, option D is the correct answer. Sun cannot be the one as the sun itself can produce its own light and thus, a source of light. The lightning is characterized as a 'flash of light' and the flashlight also produces light.

Answer:

our bodies will dehydrate causing us to die a dreadfully excruciating painful death

As per the given statement 0.297mol NO can be made when 75 moles of HNO3 are consumed

The inorganic substance with the formula HNO3 is nitric acid. It is a mineral acid that is quite corrosive. The substance is colourless, but older samples have a tendency to have a yellow cast because of breakdown into nitrogen oxides..

'3 Cu + 8HNO3      3 Cu(NO3)2 + 2 NO + 4H₂O

Element  Molar Mass

Hydrogen 1

Nitrogen 14

Copper 63.5

Oxygen 16

Referring  the above table we get  no of moles in HNO3

1(1.0) + 1(14) + 3(16) = 1 + 14 + 48 = 63 g/mol

75g HNO3 x 1 mol HNO3/63 g HNO3 = 1.190 mol HNO3

The coefficient of HNO3 is 8, and NO is 2

1.190 mol HNO3 x 2 mol NO/8 mol HNO3 = 0.297mol NO

Hence, 0.297mol NO can be made when 75 moles of HNO3 are consumed.

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We can apply the ideal gas law which tells us the following:

Where,

P is the pressure = 1atm (STP)

T is the temperature = 273.15K (STP)

R is the ideal gas constant = 0.08206 (atm L)/(mol K)

n is the number of moles

V is the volume in L

So, we have to calculate first the number of moles. We will use the molar mass of H2.

Molar mass of H2 = 2.01568 g/mol

Now, we replace the know values in ideal gas law:

So, 4374.4 grams of H2 gas are equal to 48644.0 L

Answer:

See explanation

Explanation:

We must remember that the energy required to move an electron from the 1s orbital to a higher energy level depends on the size of the nuclear charge.

The higher the nuclear charge, the more closely held the 1s electron of the atom is to the nucleus and the more difficult it is to excite this electron.

Hence, it requires more energy to excite the 1s electron of silver having a larger size of nuclear charge than it is to excite a 1s electron in lithium.