A chemist records the amount of liquid dispensed by a machine and obtains the following values: 283.2 mL, 284.1 mL, 283.9 mL, 284.0 mL, 284.1 mL. The machine is supposed to dispense 296 mL of liquid. Which of the following describes the accuracy and precision of the machine?
precise but not accurate
accurate but not precise
neither accurate nor precise
accurate and precise

Answer:

its not pulling up ? ;(

Explanation:

Answer:

4d¹ electron has quantum numbers

n=4; l=2; ml= -2; ms= 1/2

Explanation:

There are 4 quantum numbers, namely

the principal quantum number (n)

the orbital angular momentum quantum number (l)

the magnetic quantum number (ml)

the electron spin quantum number (ms)

The principal quantum number describes the orbit or shell of the electron

here n = 4 ⇒ electron is in 4th shell

the orbital angular momentum quantum number describes the shape of orbital the electron is present in.

l= 0 ⇒ s-orbital

l= 1 ⇒ p-orbital

l= 2 ⇒ d-orbital

l= 3 ⇒ f-orbital

In our case l= 2 ⇒ p-orbital

ml specifies in which orbital electron is present of given shape

ml has 2l+1 values,which range from -1 to +l

here l = 2 ⇒ ml has 2(2)+1 = 5 values (-2 to +2)

so electron is present in one of the five d-orbitals

ms represents the spin of electron (+1/2 or -1/2)

If  +1/2 represents clockwise then -1/2 represents anti-clockwise and vice-versa.

⇒  4d¹ electron has quantum numbers

n=4; l=2; ml= -2; ms= 1/2.

Hope this helped!

Answer:

C. Used Car Rule

Explanation:

Just took the test, got it right !!

Hope this helps.

Used Car Rule would provide clear warranty information on her purchase. Hence, option C is correct.

A warranty is a written promise by a company that, if you find a fault in something they have sold you within a certain time, they will repair it or replace it free of charge.

Used Car Rule would provide clear warranty information on her purchase.

Hence, option C is correct.

Learn more about the warranty information here:

https://brainly.com/question/13083558

#SPJ2

ZSM-5 is a catalyst material, which has a surface area of 581 m²/g. This is equivalent to a surface area of 5810 cm²/mg.

A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change. Catalysts have large surface areas to increase the reaction rate.

Biological catalysts are known as enzymes.

ZSM-5 is a catalyst material, which has a surface area of 581 m²/g. We want to convert this value to cm²/mg.

We will use the conversion factor 1 m = 100 cm.

581 m²/g × (100 cm/1 m)² = 5.81 × 10⁶ cm²/g

We will use the conversion factor 1 g = 1000 mg.

5.81 × 10⁶ cm²/g × (1 g/1000 mg) = 5810 cm²/mg

ZSM-5 is a catalyst material, which has a surface area of 581 m²/g. This is equivalent to a surface area of 5810 cm²/mg.

Learn more about catalysts here: https://brainly.com/question/12507566

Answer:

Its B)

Explanation:

i got it right

Aluminium is 13th element, containing 13 electrons and 13 protons. Thus the Al atomic nucleus has a charge of +13 and it is surrounded by 13 electrons.

Aluminium is 13th element in periodic table. It is placed in 13th groups and it is a metal. Aluminium is an electropositive element and it conducts so that it is considered as a metal.

The nucleus of every element is composed of neutrons and protons. Neutrons are neutral and protons are positively charged particles. Electrons are negatively charged particles  revolving  around the nucleus.

The number of protons in an atom is called its atomic number.  Hence, the nucleus of a aluminium contains 13 protons thus having +13  charge and equal number of electrons revolving around.  Hence, option B is correct.

To find more on aluminum, refer here:

https://brainly.com/question/25869623

#SPJ6

The reaction quotient will be half of the equilibrium constant  of the system.

The term equilibrium constant refers to a number that shows the extent to which reactants are converted to products when the reaction has attained equilibrium. If the system is not at equilibrium, the number is called the reaction quotient.

If the reaction system is diluted to about twice its original volume, it follows that the reaction quotient will be halved with respect to the equilibrium constant hence the most likely value of the equilibrium constant is about half of the equilibrium constant.

Learn more about equilibrium constant: https://brainly.com/question/17960050

Answer:

Q = K/4, and the rate of the forward reaction will be greater than the rate of the reverse reaction.

Explanation:

with dilution, all the concentrations in the  expression are halved, and Qc=1/2[H3O+]×1/2[Cl−]×1/2[HOCl]/   1/2[Cl2]=Kc4

. Because Qc<Kc

, the rate of the forward reaction will be greater than the rate of the reverse reaction until equilibrium is reestablished.

Considering the definition of STP conditions, 4.83 × 10⁻³ moles of HF will occupy a volume of 0.108192 L at STP.

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases, and 1 mole of any gas occupies an approximate volume of 22.4 liters.

In this case, you have 4.83×10⁻³ moles of HF. You can apply the following rule of three: if by definition of STP conditions 1 mole of HF occupies a volume of 22.4 liters, 4.83×10⁻³ moles occupies how much volume?

volume= (4.83×10⁻³ moles ×22.4 L)÷ 1 mole

volume= 0.108192 L

Finally, there is a volume of 0.108192 L at STP.

Learn more about STP conditions:

brainly.com/question/17915431

#SPJ1

Answer:

A. 1. Strong acid (sa): Hydrobromic acid: HBr (aq)

2. Strong acid (sa); Hydrochloric acid: HCl (aq)

3. Weak acid (wa); Carbonic acid: H₂CO₃ (aq)

B. H+ (aq) + OH- (aq) ----> H₂O (l)

Explanation:

Strong acids are which ionize completely in aqueous solution into hydrogen ions and the corresponding anion. Examples of strong acids include hydrobromic acid, hydrochloric acid, tetraoxosulfate (vi) acid.

The ionization of hdyrobromic and hydrochloric acids in aqueous solution is given below:

1. Hydrobromic acid: HBr (aq) ----> H+ (aq) + Br- (aq)

Hydrobromic acid in aqueous solution ionizes completely into hydrogen ions and bromide ions

2. Hydrochloric acid: HCl (aq) ----> H+ (aq) + Cl- (aq)

Hydrochloric acid in aqueous solution ionizes completely into hydrogen ions and chloride ions

Weak acids are acids which ionizes only partially in aqueous solutions to hydrogen ions and the corresponding anions. Examples of weak acids are carbonic acid and ethanoic acid. The ionization of carbonic acid in aqueous solution is shown below:

3. Carbonic acid: H₂CO₃ (aq) ⇄ 2 H+ (aq) + CO₃²- (aq)

Carbonic acid ionizes partially only to give hydrogen ions and trioxocarbonate (iv) ions. The unionized acid exists in equilibrium with the ions produced by the partial ionization of the acid.

Part B:

The reaction between hydrochloric acid and barium hydroxide is a neutralization reaction producing barium chloride salt and water.

The net ionic equation of the neutralization reaction is given below :

H+ (aq) + OH- (aq) ----> H₂O (l)

Answer:

\(\rho=4\frac{g}{cm^3}\)

Explanation:

Hello,

In this case, given the formula for density:

\(\rho = \frac{m}{V}\)

We can compute it by noticing the given mass of 100 grams and the volume of 25 cubic centimetres:

\(\rho = \frac{100g}{25cm^3} \\\\\rho=4\frac{g}{cm^3}\)

Best regards.

Answer:4g/cm3.

Explanation:

The Density of a substance or object  is the mass of the substance per unit  volume of the object.

formula for density is d = M/V,

where

where d is density= ?

M is mass, =100g

V is volume = 25cm3

Density = M/V =100g/25cm3= 4g/cm3.

The balanced chemical equation for the reaction is:

2NaOH(aq) + FeCl₂(aq) --> 2NaCl(aq) + Fe(OH)₂(s)

Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.

The reactants are located on the left side while the products are located on the right side.

Reactants —> Products

The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.

Sodium hydroxide => NaOH

Iron (II) chloride => FeCl₂

2NaOH(aq) + FeCl₂(aq) --> 2NaCl(aq) + Fe(OH)₂(s)

Learn more about chemical equation:

https://brainly.com/question/7181548

#SPJ1

Answer:

3.55e-7

Explanation:

Answer:

c

Explanation:

The average atomic mass of an element is calculated as the weighted average of the masses of its isotopes, taking into account their natural abundances.

Given the average atomic mass of 11.66 amu and the natural abundance of 65% for 11M, we can calculate the contribution of 11M to the average atomic mass as follows:

11.01 amu * 0.65 = 7.165 amu

Next, we can subtract this contribution from the average atomic mass to find the contribution of 13M:

11.66 amu - 7.165 amu = 4.495 amu

Finally, we can divide this contribution by the natural abundance of 13M (0.35) to find the isotopic mass of 13M:

4.495 amu / 0.35 = 12.87 amu

So the isotopic mass of 13M is approximately 12.87 amu.

To know more about natural abundances, visit the link given below:

https://brainly.com/question/5338540

#SPJ4

Answer:

The s stands for the phase of that element or compound. The phase solid is represented by (s). In this problem it is saying solid sodium (Na) is reacting with Bromine (Br) gas to form sodium bromide.

Explanation:

Answer:

A and B

Explanation:

Trust me I just did it on a p e x

Answer: he’s correct it’s d and b for me but it’s the same answers

Explanation:

Answer:

Explanation:

The density of a substance can be found by using the formula

From the question

mass = 498 g

volume = 11.9 mL

Substitute the values into the above formula and solve for the Density

That's

We have the final answer as

Hope this helps you

According to our reactions:

1) Li(s) + O2(g) ==> Li2O(s)

It is a Redox reaction, Li is oxidized and O is reduced. We have here loss and gain of electrons.

2) It is a precipitation reaction because when the PbI2 is formed, it precipitates.

3) This is the reaction of an acid with a base, so it is an acid/base reaction.

The bonds do not have energy, the atoms release heat.

change: unmarried alternative AB + C → AC + B

exchange: Double alternative AB + CD → ad + CB

mixture (Synthesis) A + B → AB

Decomposition AB → A + B

A chemical reaction is a method that ends in the chemical transformation of one set of chemical substances to some other.

A procedure that includes rearrangement of the molecular or ionic shape of a substance, in preference to a exchange in bodily form or a nuclear reaction.

A chemical response is a technique in reactants react chemically and convert into products via chemical transformation. as an example, breathing – we inhale oxygen which reacts with glucose and produces carbon dioxide, water and strength. The response is given below. C6H12O6 + 6O2 → 6CO2 + 6H2O + power.

Learn more about the chemical reaction here:-

https://brainly.com/question/11231920

#SPJ1

Answer:

0.76 mol

Explanation:

There is 0.025032542304996 mol in 1 gram of Argon.

In 30.4 grams of argon, there is 0.7609892860718934 mol.

Answer:

1.07

Explanation:

Did the assignment

Ethyne gas undergo combustion reaction to give two moles of carbon dioxide and water as per the balanced equation written below:

\(\rm C_{2} H_{2} + \frac{5}{2} O_{2} \rightarrow 2CO_{2} + H_{2}O\)

Combustion is a type of reaction in which a gas burns in oxygen to give water and carbon dioxide. Hydrocarbons alkanes, alkenes or alkynes easily undergo combustion reaction and they can be used as fuels.

C₂H₂ is an alkyne names ethyne and it is an unsaturated hydrocarbon with triple bond between two carbon atoms. Ethyne gas reacts with oxygen to give two moles of carbon dioxide and one mole of water.

To balance the number of carbons the right side carbon dioxide is multiplied by 2 and the number of oxygens is balanced accordingly to get the balanced equation as follows:

\(\rm C_{2} H_{2} + \frac{5}{2} O_{2} \rightarrow 2CO_{2} + H_{2}O\)

To find more on combustion, refer here:

https://brainly.com/question/13153771

#SPJ1

Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

The number of moles of CO2 produced is 0.021 moles

If the estimated volume of the balloon is wrong then the amount of glucose reacted must be more than is stated.

The respiration equation represents the chemical process of aerobic cellular respiration, which occurs in the mitochondria of cells and is the primary way in which cells generate energy in the form of ATP (adenosine triphosphate).

The equation of the reaction is;

C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP

We know that;

Number of moles of glucose = 10 g/180 g/mol

= 0.056 moles

PV = nRT

n = PV/RT

n = 1 * 0.55/318 * 0.082

n = 0.021

Learn more about glucose:https://brainly.com/question/2252123

#SPJ1

The counter-contemporary mechanism Increasing salt consumption expanded sodium excretion, however additionally suddenly precipitated the kidney to preserve water.

Excess sodium become for this reason launched in focused urine. This technique of protective the body's water become so green that the guys without a doubt drank much less whilst their salt consumption become highest.

The counter-contemporary multiplier or the countercurrent mechanism is used to pay attention urine withinside the kidneys with the aid of using the nephrons of the human excretory system. The nephrons concerned withinside the formation of focused urine increase all of the manner from the cortex of the kidney to the medulla and are observed with the aid of using vasa recta.As already indicated, the loop of Henle is essential to the cappotential of the kidney to pay attention urine.

Read more about salt:

https://brainly.com/question/13818836

#SPJ4

Explanation:

If the last electron enters the p-orbital after the electron configuration of the element, then that element is called the p-block element. The electron configuration of nitrogen(N) shows that the last electron of nitrogen enters the p-orbital. Therefore, nitrogen is the p-block element.

The properties of a natural resource that make it useful for humans as a material or energy source is the ability to convert mass into energy and vice versa.

The expression natural resources make reference to all types of matter and energy extracted from nature that can be used to produce goods and services.

Some examples of natural resources include for example irreversible resources such as fossil fuels (i.e., oil, or coal, gas, minerals such as metals, rocks, etc) as well as those based on the use of reversible energy such as eolic air energy, solar radiation or sunlight, soil and hydric resources or water.

Therefore, with this data, we can see that natural resources can be defined as any material and or energy obtained from nature that may be irreversible or reversibly used to produce goods and services.

Learn more about natural resources here:

https://brainly.com/question/24514288

#SPJ1

The substance begins to boil at 2750⁰C, the substance begins to melt at 1500⁰C, the temperature at which the substance is both a liquid and a gas at 2750⁰C, temperature is the substance both a solid and a liquid​ at 1500⁰C.

Heating curves are the graphical correlations between heat added to a substance. When viewed from a cooling perspective, ie. loss of heat, it is the cooling curve.

The gradient of the cooling curve is related to the heat capacity, the thermal conductivity of the substance, and the external temperature. The more heat is required to change the temperature of the substance, the slower it cools, so the smaller the gradient of the curve. The higher the thermal conductivity, the faster heat is transferred, so the faster the substance cools.

Learn more about Heating curve, here:

https://brainly.com/question/29592874

#SPJ1

The number of moles for the quanity 8.06 x\(10_{21\) atoms of Pt​ is approximately 2.61 grams.

To calculate the number of moles for a given quantity of atoms, we can use Avogadro's number and the molar mass of the element. Avogadro's number is 6.022 x 10²³ atoms/mol.

In this case, you have 8.06 x 10²¹ atoms of Pt. To find the number of moles, divide this quantity by Avogadro's number:

8.06 x 10²¹  atoms Pt / 6.022 x 10²³  atoms/mol = 0.0134 mol Pt

So, there are approximately 0.0134 moles of Pt in 8.06 x 10²¹  atoms of Pt.

The molar mass of Pt (platinum) is 195.08 g/mol. To convert the number of moles to grams, multiply the number of moles by the molar mass:

0.0134 mol Pt x 195.08 g/mol = 2.61 g Pt

Therefore, there are approximately 2.61 grams of Pt in 8.06 x10²¹  atoms of Pt.

In summary, the number of moles for the quantity 8.06 x 10²¹ atoms of Pt is approximately 0.0134 moles. This is equivalent to approximately 2.61 grams of Pt. Remember to use Avogadro's number and the molar mass to perform these calculations accurately.

Know more about  moles   here:

https://brainly.com/question/29367909

#SPJ8

Answer:

13.53 g/mL

Explanation:

We can calculate the density of an object if we are given its mass and its volume, using the following equation:

We input the data given by the problem:

Thus the density of the mercury sample is 13.53 g/mL

Answer:

HCI + NaOH is NaCI + H2O

Explanation:

Answer:

Phototropism.

Explanation:

Phototropism is the phenomenon of plants growing in response to light. This is a response to the plants to align or steer towards the source of sunlight, thereby becoming the 'path' to their growth.

The term "photo" means light and "tropism" means "growth" or movement towards". So, we can safely say that phototropism is the scientific and natural phenomenon of plants growing towards or in response to the sunlight.

Thus, the correct answer is phototropism.