what is the first step in the scientific inquiry process​

Answer:

Element

Explanation:

Iron is an element

Answer:

C. 25 m

Explanation:

Answer:

D. 30 metres

Explanation:

25 rounded to one significant figure is 30 because the unit is 5 so you round up to 30

:)

Answer:The pressure exerted by the gas is 100kPa

Explanation:Let's apply the Charles Gay Lussac law, to solve the question.

At constant volume, the pressure varies proportionally with the temperature.

P initial / T° initial = P final / T° final

50kPa / 20°C = P final / 40°C

Temperature has increased the double, so the pressure will be increased, the double too.

100 kPa

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Answer:

ok so i did the problem and the answer was 8e+29

Explanation:

i dont really know what the answer is but thats the answer i got

sorry if this didnt help

Answer:

215.9 cm

Explanation:

1 foot= 30.5cm

30.5cm times 7 1/12=215.9cm

The given height of David is 7 ft, 1.0 inch, so in centimeters, the height will be 216.4 cm.

A conversion factor is a number that is used to multiply or divide one set of units into another. When converting to an equal value, the appropriate conversion factor must be used.

We must convert one unit to another in order to achieve accuracy and avoid measurement confusion.

We do not, for example, measure the length of a pencil in kilometers. In this case, one must convert kilometers (km) to centimeters (cm) (cm).

To convert feet to centimeters, multiply the given foot length by 30.48 cm.

So,

Height in cm will be = 7.1 x 30.48

Height in cm = 216.4cm

Thus, the height of David in centimeters is 216.4 cm.

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Answer: 212

Explanation:

When an electron moves from n = 2 to n = 1, it emits a photon of ultraviolet light.

During transition from n=2 to n=1 in a hydrogen atom, the electron emits energy in the form of photon. We know that when electron absorb energy, it moves from lower level to higher level and vice versa.

So we can conclude that when an electron moves from n = 2 to n = 1, it emits a photon of ultraviolet light.

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Answer:

sodium perchorate is NaCLO4

calcium sulfite CaSO3

potassium hydroxide KOH

lithium nitrate LiNO3

Explanation:

sodium perchorate has one Sodium

one Chlorine and 4 Oxygen

calcium sulfite has one Calcium on sulfate and 3Oxygen

lithium nitrate has one Lithium oneNitrogen

3 Oxygen

It is incorporated with audio equipment to enhance sound quality. Diamonds are hard and easily vibrate at fast speeds, which results in high-quality sound. High-end recorders and DJ equipment both use it. Nanodiamonds have potential health benefits.

The carbon atoms in diamond are organised in a diamond cubic crystal lattice, making it an allotrope of carbon. Diamond is the material with the highest heat conductivity and hardness among all naturally occurring substances. Diamond is a particularly important component of industrial cutting and polishing equipment due to its unique qualities.

These days, diamond exfoliators and face products are accessible. Diamond dust is now being used in cosmetics, thus the price will undoubtedly be exorbitant. Diamond is used in beauty products to minimize wrinkles, etc.

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Answer:

Explanation:

Here, we want to get the number of regular strength pills of ibuprofen

To get this,we firstly need to get the number of moles

We can get this by dividing this value by the number of molecules in 1 mole which is:

Mathematically, we have this as:

From earlier calcuations, 1 pill of regular strength ibuprofen contains 0.000963 moles

The number of pills that will contain overall 0.00291 moles will be:

Explanation:

The definition of buffer solution is: "a buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or a weak base and its conjugate acid.

• HNO₂/NO₂⁻:

HNO₂ is a weak acid and NO₂⁻ is its conjugate base. So they can form a bufffer solution.

• NH₃/NH₄⁺:

NH₃ is a weak base and NH₄⁺ is its conjugate acid. So they can form a bufffer solution.

• HCN/CN⁻:

HCN is a weak acid and CN⁻ is its conjugate base. So they can form a bufffer solution.

• HCl/OH⁻:

HCl is a strong acid and OH⁻ represents a strong base. So they can't form a bufffer solution.

Answer: HCl/OH⁻

The mole ratio that can be used to obtain the amount of the CuO formed from 3.95 g of oxygen is 2 mol CuO/3 mol O2.

Mole ratio is the ratio in moles of any two compounds that participate in a chemical reaction. It is determined by balancing a chemical equation and looking at the coefficients in front of each compound.

Mole ratios are used in stoichiometric calculations to determine the amount of one substance that reacts with another based on a balanced equation.

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Explanation:

2-metylbutene should be the profuct

First, find the molecular weight of Mg(NO3)2.

The molecular weight of Mg is 24.3 g/mol and the molecular weight of NO3 (nitrate ion) is 62 g/mol.

So, the molecular weight of Mg(NO3)2 is 24.3 + (2 x 62) = 150 g/mol.

Next, we can find the number of moles in 120 g of Mg(NO3)2:

120 g / 150 g/mol = 0.8 mol

So, there are 0.8 moles of Mg(NO3)2 in 120 g.

The mass of a mole of a material is its molecular weight. Typically, grams per mole are used as the unit of measurement. In this video, we demonstrate how to determine a substance's molecular weight using the periodic table's listed atomic weights. On a different page, we perform a conversion between the macroscopic scale (represented by grams of a substance) and the microscopic scale using the molecular weight (number of molecules of that substance). The molecular weight of a material is the weight, in atomic mass units, of each atom in a specific formula. One atomic mass unit is equal to one-twelfth of the weight of carbon-12. The most accurate sign is u, while the previous one was amu (a lowercase letter u).

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Answer:

0.500-Molarity solution

Explanation:

The moles of the compound is given as the number of atomic mass unit in the compound. The moles of potassium nitrate in the solution are 0.6 mol

The molarity is the concentration unit, and it can be defined as the moles of compound present in the liter of solution.

The molarity can be expressed as:

\(\rm Molarity=\dfrac{Moles}{Volume(L)}\)

The given potassium nitrate solution has, molarity = 2 M

The volume of the solution is 0.3 L.

Substituting the values for the moles of the compound:

\(\rm 2\;M=\dfrac{Moles}{0.3\;L} \\\\Moles=2\;\times\;0.3\;mol\\Moles=0.6\;mol\)

The moles of potassium nitrate in 2 M solution is 0.6 mol.

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Answer:

An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. ... The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons. A proton is positively charged.

Answer:

An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. ... The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons. A proton is positively charged.

Steel is produced from pig iron through a process known as steelmaking or iron and steel production.

The pig iron obtained from the blast furnace contains high amounts of carbon, impurities, and other elements. To convert pig iron into steel, the carbon content needs to be reduced to desired levels, and impurities must be removed.One common method of steelmaking is the basic oxygen process (BOP). In this process, pig iron is placed in a vessel called a converter, where oxygen is blown through the molten metal. The oxygen reacts with the carbon and impurities, causing them to oxidize and form gases that are released. Alloying elements and desired additives can be added at this stage to achieve specific steel properties. Another method is the electric arc furnace (EAF), where an electric arc is used to heat and melt the pig iron, allowing impurities to be oxidized and removed.The advantages of using steel are numerous. Steel is strong, durable, and versatile, making it suitable for a wide range of applications. It has high tensile strength, which means it can withstand heavy loads and pressures. Steel is also resistant to corrosion, making it ideal for construction, infrastructure, and transportation projects. It is a recyclable material, contributing to sustainability and reducing environmental impact. Additionally, steel can be fabricated into various shapes and sizes, allowing for customization and flexibility in design.References:

A. Ghosh and A. Chatterjee, Ironmaking and Steelmaking: Theory and Practice, PHI Learning, 2008.

R.H. Tupkary and V.R. Tupkary, An Introduction to Modern Iron Making, Khanna Publishers, 2010.

J.R. Davis, ed., ASM Specialty Handbook: Carbon and Alloy Steels, ASM International, 1995.

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In the case of a real gas when you're using Van Der Waals equation, the volume of a real gas is considered as (Vm - b), where b can be considered as the volume occupied by per mole.

Therefore, when the ideal gas law gets substituted with V = Vm  - b, it is given as : P(Vm  - b) = nRT

The presence of intermolecular attraction P was modified as follows.

\(\frac{P+a}{V^{2} } (Vm- b) = RT\\\frac{P+an^{2} }{V^{2} } (V - nb) = nRT\)

Where, Vm: molar volume of the gas

R: universal gas constant

T: temperature

P: pressure

V: volume

Thus, it is possible to reduce Van Der Waals equation to the ideal gas law as PVm = RT.

What is the significance of the Ideal gas Law?

The ideal gas law only functions as an approximation approach when high accuracy is not necessary because it describes the behaviour of ideal gasses, which there aren't any of. It is a solid introduction to the fundamental behaviour of gases and works well as a teaching tool, which is why it is taught to the majority of university students as part of any introduction to physics. In essence, the ideal gas law enables students to comprehend ideas such as the process of thermodynamic cycles, such as an engine, the reason an airbag expands, what transpires to a balloon at high altitude, and other related ideas.

Hence, Van Der Waals equation to the ideal gas law as PVm = RT.

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Answer:

the answer is A

Explanation:

edg 2020

Answer:

the air above a wildfire/A

Explanation:

Theoretically, if 20 grams of hydrogen reacts then 112.5 grams of ammonia is produced.

The balanced chemical equation can be given as:

N₂+3H₂→ 2NH₃

From stoichiometry, 2 mol of NH₃is produced from 3 mol of H₂

5 mol of NH₃ will be produced from = 3/2×5 = 7.5 mol of H₂

∴mass of H₂=7.5×2= 15gm of H₂.

Excess reagents are those reactants in a chemical reaction that are not exhausted at the end of the reaction. A completely exhausted or reacted reagent is called a limiting reagent because its amount limits the number of products formed. In this reaction, the excess reagent is Nitrogen as 35 grams of nitrogen and 15 grams of hydrogen react to produce 34 grams of ammonia.

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Answer:

\(C_{zinc}=0.400\frac{J}{g\°C}\)

Explanation:

Hello!

In this case, by considering thermodynamics and the temperature of zinc, we can infer it is hot while water is cold, it means that the heat lost by the zinc is gained by the water and we can write:

\(Q_{Zn}=-Q_{water}\)

In terms of mass, specific heat and temperatures we can write:

\(m_{Zn}C_{Zn}(T_{eq}-T_{Zn})=-m_{water}C_{water}(T_{eq}-T_{water})\)

In such a way, by solving for the specific heat capacity of the zinc we write:

\(C_{zinc}=\frac{-m_{water}C_{water}(T_{eq}-T_{water})}{m_{Zn}(T_{eq}-T_{Zn})}\)

Thus, by plugging in the given values we obtain:

\(C_{zinc}=\frac{-45.0g*4.184\frac{J}{g\°C}* (27.1\°C-98.8\°C)}{13.8g*(27.1\°C-98.8\°C)}\\\\C_{zinc}=0.400\frac{J}{g\°C}\)

Best regards!

Hi!

0.156000 is written as 1.56000 × 10-1 in scientific notation.

Answer:

where is the question?

Answer:

that would just create a bigger mess if you flush it with ice water it can reduce swelling and help dull your nerves

Explanation:

If acid comes in contact with your skin, because having an excessive amount of base can also be harmful. Acid is weakened and rendered ineffective by water.

A chemical species known as an acid absorbs electrons and/or provides protons or hydrogen ions. When a hydrogen atom is bound to an acid, it can release (dissociate) and produce a cation as well as an anion in water. A substance's acidity and solution pH increase according to the amount of hydrogen ions it produces.

There are various definitions for acids. When someone uses the term "an acid," they typically mean an Arrhenius or Brnsted-Lowry acid. Often, a Lewis acid being referred to as a "Lewis acid." If acid comes in contact with your skin, because having an excessive amount of base can also be harmful. Acid is weakened and rendered ineffective by water.

Therefore, if acid comes in contact with your skin, because having an excessive amount of base can also be harmful. Acid is weakened and rendered ineffective by water.

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The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol

Given data :

Volume of solution to be tested for I-ion = 10 mL

Volume of  Pb(NO₃)₂ = 0.2 mL

molarity of Pb(NO₃)₂ = 0.13 M

First step : calculate conc of PB²⁺ ions in the solution

conc of PB²⁺ ions =  ( molarity of Pb(NO₃)₂ * volume of  Pb(NO₃)₂ ) / ( total volume )

                              = ( 0.13 * 0.2 ) / ( 10 + 0.2 )

                              = ( 0.026 ) / ( 10.2 )  = 0.002549 M

Next step : determine the molarity of  I

using the dissociation reaction of PbI₂

PbI₂(s) ---> Pb²⁺ (aq)  + 2I (aq)

also;  Ksp = [ Pb²⁺ ] [ I ]²  ---- ( 1 )

From the question the given value of Ksp = 8.49 * 10⁻⁹

Therefore equation ( 1 ) becomes

8.49 * 10⁻⁹ = ( 0.002549 ) * [ I ]²

[ I ] = √ ( 8.49 * 10⁻⁹ ) / ( 0.002549 )

      = 0.0018 M

Final step : Determine the minimum number of grams of I

moles of I = molarity of I * total volume

                 = 0.0018 M * 10.2 mL

                 = 0.01836 * 10⁻³ mol

Hence we can conclude that The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol

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Answer:

1- damp

meaning: slightly wet

2-stain

meaning: smear

3-scrub

meaning: rub

4-rust

meaning: stain form iron

5-bleach

meaning: expose under the sun

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Answer:

55 moles FeS2

Explanation:

You can't do this without knowing what the reactants and products are. Even then the reactants and products have to have equal numbers of atoms on each side of the equation. That's called balancing.

The bare equation is

FeS2 + O2 → Fe2O3 + SO2

It is not balanced. Just as an example, the sulfurs have 2 on the left and 1 on the right. The oxygens have 2 of the left and 5 on the right, so you have to get all of that balanced.

Start with the oxygen in Fe2O3. It's an odd number. Put 2 in front of Fe2O3

FeS2 + O2 → 2Fe2O3 + SO2

But now the Fe's don't balance. Put a 4 in in front of the FeS2

4FeS2 + O2 ===> 2Fe2O3 + SO2

The Ss are way out of kilter. Put an 8 in front of SO2

4FeS2 + O2 → 2Fe2O3 + 8SO2

Finally the oxygens There are 2*3 + 8*2 = 22 oxygens on the right

Put an 11 (because it is O2) on the left

4FeS2 + 11O2 → 2Fe2O3 + 8SO2

That's your balanced equation

4 mols of FeS2 produce 2 moles of Fe2O3

x mols of FeS2 produce 27.5 mols of Fe2O3

4/x = 2/27.5            Cross multiply

2x = 4*27.5

2x =  110                  Divide by 2

x = 110/2

x = 55            

Answer: Without more information, it is impossible for me to accurately answer your question. In general, cells transport materials across their cell membrane through a variety of mechanisms, including diffusion, osmosis, facilitated diffusion, and active transport. The type of transport that a cell uses depends on the specific needs of the cell and the materials being transported.

Answer:

Voltage is the measure of electric potential energy per unit charge, current is the flow of electric charge through a circuit, and resistance is the property of a material that opposes the flow of electric current.

Ohm's Law relates these three concepts by stating that current is directly proportional to voltage and inversely proportional to resistance.

Hope this helps!