Investigate how the chemical properties of a substance will affect its use

The length in kilometers of a row of 4.34 x 1023 hydrogen atoms is 4.34 x 10¹⁴ km.

The length of the entire hydrogen atom is calculated as follows;

Length of the row = number x diameter of one

Length of the row = 4.34 x 10²³ x 10⁶ x 10⁻¹²

Length of the row = 4.34 x 10¹⁷ m

Length of the row = 4.34 x 10¹⁴ km

Thus, the length in kilometers of a row of 4.34 x 1023 hydrogen atoms is 4.34 x 10¹⁴ km.

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Answer:

magnesium metal melts = physical change

magnesium metal ignites = chemical change

Explanation:

Physical changes are those in which the identity of the subtance remains unaltered. No new compounds are formed. They involve generally changes in agreggation states of matter: solid, liquid or gas. The first experiment, in which magnesium metal melts is a physical change because it only changes the state of matter, from solid to liquid, but it is still magnesium metal.

Conversely, chemical changes involve atoms combinations to form new compounds. The second experiment, in which magnesium metal ignites, is a chemical change. After the change, magnesium metal is no longer the metal but a metal oxide.

It is essential to learn the usage of fire extinguishers before doing practical work in the laboratory as a fire can arise at any time.

Before performing practical work in lab, learning how to use a fire extinguisher is crucial because fires can happen unexpectedly in a lab. This can be due to variety of reasons, including electrical faults, chemical reactions, or human error. Understanding how to use a fire extinguisher can assist keep small fires from escalating and harming people, property, or the lab itself.

Aside from that, different fires call for various fire extinguishers. For example, it is best to avoid using water-based fire extinguishers on electrical or chemical fires since they may worsen the situation. It is crucial to understand how to choose and utilise the appropriate fire extinguisher for the sort of fire that can develop in the laboratory.

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Answer:

Because of the difficulties of measuring the atmosphere's properties above the earth's reachable surface

Explanation:

Hello,

In this case, meteorology is the branch of science studying the atmosphere in its weather processes and forecasting and it had a late development because of the difficulties of measuring the atmosphere's properties above the earth's reachable surface. We cannot forget that even nowadays, it is very difficult to predict upcoming weathers with the 100 % assurance and with many days in advance.

Best regards.

Meteorology is developed lately as compared to other branches of science due to far away from the reach of humans.

Meteorology is a late developer compared to other branches of science because the measuring the climatic conditions in the atmosphere is difficult and even impossible without the presence of advance technologies.

To find out the weather as well as climatic conditions can't be measured due to it is not reachable to the human like other materials present on the earth surface so we can conclude that meteorology is developed lately as compared to other branches of science due to far away from the reach of humans.

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Answer:

D

Explanation:

thermal energy must be transferred from the ice to it's surroundings

Thermal energy is the heat and energy present in the system. The thermal energy must be dissipated from ice to the surroundings to melt and produce liquid. Thus, option D is correct.

Thermal energy is present in any substance in the form of energy and heat that depends on kinetic energy, orderliness, randomness, temperature, etc. It is passed from a substance to the surrounding at a lesser temperature.

The ice can melt into a liquid when it loses its thermal energy and heat to the surrounding with increased kinetic energy and releases the temperature to the area with a temperature less than the ice.

Therefore, the heat from ice will get dissipated to the outer environment to melt.

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Answer:

C. 7

Explanation:

act what's the question?

Answer:

B. They are clones of the parent plant

Explanation:

Acetic acid only partially ionizes in water as it is a weak acid.

Weak Acids are the acids that do not completely dissociate into their constituent ions when dissolved in solutions.

When dissolved in water, an equilibrium is established between the concentration of the weak acid and its constituent ions.

Acetic acid, also known as ethanoic acid, is a weak acid with the chemical formula CH₃COOH. It is known to be the active component of vinegar.

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The mass percentage of C in morphine would be 4.21%.

The mass percentage of a composition in a compound is the mass of the composition relative to the mass of the entire compound. This can be mathematically expressed as:

Mass percentage = mass of component/mass of substance x 100%

In this case, we are looking for the mass percentage of C in \(C_{17}H_{19}NO_3\).

Molar weight of C = 12 g/mol

Molar mass of  \(C_{17}H_{19}NO_3\) = (12x17) + (1x19) + (14x1) + (16x3)

                                             = 285 g/mol

Mass percentage of C = 12/285

                                     = 4.21% to 2 decimal places.

In other words, the mass percentage of C in morphine is 4.21%.

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An example of a element would be chlorine gas

An element is a substance whose atoms all have the same number of protons another way of saying this is that all atoms of a given element have the same number of protons and elements are the simplest chemical forms and thus can not be broken down through chemical reactions and chlorine is a yellow-green gas at room temperature and chlorine has a pungent, irritating odor similar to bleach that is detectable at low concentrations and the density of chlorine gas is approximately 2.5 times greater than air and in the given option only chlorine gas is the element

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Answer:

1) Iron(II) chlorate: Fe(ClO3)2

2) Lead(IV) chlorate: Pb(ClO3)4

3) Iron(II) bromate: Fe(BrO3)2

4) Lead(IV) bromate: Pb(BrO3)4

Answer : The mass of \(H_2\) is, 9.64 grams.

Explanation : Given,

Mass of \(NH_3\) = 54.6 g

Molar mass of \(NH_3\) = 17 g/mol

Molar mass of \(H_2\) = 2 g/mol

First we have to calculate the moles of \(NH_3\).

\(\text{Moles of }NH_3=\frac{\text{Given mass }NH_3}{\text{Molar mass }NH_3}\)

\(\text{Moles of }NH_3=\frac{54.6g}{17g/mol}=3.21mol\)

Now we have to calculate the moles of \(H_2\)

The balanced chemical equation is:

\(2NH_3(g)\rightarrow 3H_2(g)+N_2(g)\)

From the balanced reaction we conclude that

As, 2 mole of \(NH_3\) react to give 3 moles of \(H_2\)

So, 3.21 mole of \(NH_3\) react to give \(\frac{3}{2}\times 3.21=4.82\) mole of \(H_2\)

Now we have to calculate the mass of \(H_2\)

\(\text{ Mass of }H_2=\text{ Moles of }H_2\times \text{ Molar mass of }H_2\)

\(\text{ Mass of }H_2=(4.82moles)\times (2g/mole)=9.64g\)

Therefore, the mass of \(H_2\) is, 9.64 grams.

9.6 grams of H₂ can be formed from 54.6 grams of NH₃ in the following reaction: 2NH₃(g) → 3H₂(g) + N₂(g).

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You would recover 36.525g of NaCl after evaporating all of the water.

To find the grams of NaCl that would be recovered after evaporating all the water, we can use the following formula:

mass = moles * molar mass

Where:

Moles = Molarity * Volume

Molarity = 0.250 M

Volume = 2500.0 mL = 2.5 L

Molar mass of NaCl = 58.44 g/mol

mass = 0.250 M * 2.5 L * 58.44 g/mol

mass = 36.525 g

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Answer:

Explanation:

The number of atoms can be found by using the formula

N = n × L

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 0.64 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Answer:

\(heat = mc \triangle \theta \\ = 70 \times 4.18 \times (87 - 21) \\ = 19311.6 \: joules\)

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Actually Welcome to the Concept of the Mass.

The amount actual matter in an object is called as Mass.

hence, D.) is the answer, Mass

Answer:

2.20 x 10²⁵ atoms

Explanation:

Atoms of CO= 36.6-mol sample

From Avogadro's constant, which is

(6.022 × 10^ 23 atoms per mole)

Then

Number of atoms=[ 6.022 × 10^ 23 atoms/mole] × [36.6-mol]

= 2.20 x 10²⁵ atoms

Hence, number of atom is 2.20 x 10²⁵ atoms

The linear combination of 2p1 and 2p2 functions can be used to generate the hydrogenic 2px and 2py orbitals.

Orbitals are regions of space that describe the probable location of an electron around an atom's nucleus. They are usually shown as a cloud-like region and are divided into sub-regions called s, p, d, and f orbitals. Each orbital has a specific energy level and a specific shape. The orbitals determine the properties of the atom and its chemical behavior. Electrons in different orbitals interact in different ways, and this determines the type of bonds that form between atoms.

This is done by adding and subtracting the two functions and then normalizing the resultant wave functions. This gives the following expressions:

2px = (1/√2)(2p1 + 2p2)

2py = (1/√2)(2p1 - 2p2)

The hydrogenic 2pz orbital is simply equal to the 2p0 function, since the z-axis is the axis of highest symmetry.

Thus, 2pz = 2p0.

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Explanation:

Formic acid (HCOOH) reacts with sodium hydroxide (NaOH) to form sodium formate (HCOONa) and water. The balanced chemical equation is:

HCOOH + NaOH → HCOONa + H2O

The reaction is a strong acid-strong base titration. We can use the following equation to calculate the concentration of formate ion (HCOO^-) in the resulting solution:

[HCOO^-] = [OH^-] - [HCOOH]

where [OH^-] is the concentration of hydroxide ion and [HCOOH] is the concentration of formic acid before the reaction.

Before the reaction, the solution contains 0.25 mol/L of formic acid in 55.0 mL, or 0.25 mol/L × 0.055 L = 0.01375 mol of formic acid. The solution also contains 0.12 mol/L of sodium hydroxide in 75.0 mL, or 0.12 mol/L × 0.075 L = 0.009 mol of sodium hydroxide.

Since the reaction between formic acid and sodium hydroxide is a 1:1 reaction, all the 0.009 mol of sodium hydroxide will react with 0.009 mol of formic acid, leaving 0.00475 mol of formic acid unreacted.

[HCOO^-] = [OH^-] - [HCOOH]

[OH^-] = [NaOH] = 0.12 mol/L × 0.075 L / 0.13 L = 0.0692 mol/L

[HCOO^-] = 0.0692 mol/L - 0.00475 mol/L = 0.0645 mol/L

Now we can calculate the pH of the resulting solution using the Ka expression for formic acid:

Ka = [HCOO^-][H3O^+]/[HCOOH]

[H3O^+] = Ka × [HCOOH] / [HCOO^-]

[H3O^+] = 1.77 × 10^-4 × 0.00475 mol/L / 0.0645 mol/L

[H3O^+] = 1.29 × 10^-5 mol/L

pH = -log[H3O^+]

pH = -log(1.29 × 10^-5)

pH = 4.89

Therefore, the resulting pH is 4.89.

Answer:

Using the Dalton's law

P (Total) = Poxygen +Pwater

The vapor pressure of water is 21mmHg

751mmHg = Poxygen + 21 mmHg

Poxygen = 751 mmHg - 21 mmHg

Poxygen =730 mmHg

Convert the partial pressure of oxygen in to atmosphere

(730 mmHg) (1 atm / 760 mmHg) = 0.96 atm

Mixtures are impure substances composed of two or more substances physically combined.

Mixtures are substances that are composed of two or more substances physically combined.

Mixtures are one of the different types of substances which are composed of matter.

The classification of matter by type of substance is as follows:

In conclusion, substances can be classified into either pure substances or mixtures.

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Answer:

what e said

Explanation:

The milliliters of hot air that a balloon's gondola is suspended below is 2775millilitres.

Litres and millilitres are both unit of measures of volume.

According to this question, a hot air balloon's gondola is suspended below a cloth envelope containing 2.775 x 10⁰ liters of hot air.

The conversion factors of litres to milllilitres;

1000mL = 1L

2.775 × 10⁰ × 1000 = 2775millilitres

Therefore, the milliliters of hot air that a balloon's gondola is suspended below is 2775millilitres.

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Answer:

–2733.4 KJ

Explanation:

The balanced equation for the reaction is given below:

C₂H₅OH + 3O₂ —> 2CO₂ + 3H₂O

ΔH = −1366.7 kJ

From the balanced equation above,

1 mole of C₂H₅OH reacted to produce enthalpy change (ΔH) of −1366.7 kJ.

Finally, we shall determine the enthalpy change (ΔH) produced by the reaction of 2 moles of C₂H₅OH. This can be obtained as follow:

From the balanced equation above,

1 mole of C₂H₅OH reacted to produce enthalpy change (ΔH) of −1366.7 kJ.

Therefore, 2 moles of C₂H₅OH will react to produce enthalpy change (ΔH) of = 2 × −1366.7 = –2733.4 KJ.

Thus, enthalpy change (ΔH) obtained is –2733.4 KJ

we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.

To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.

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The final concentration of the reactant of a first order reaction can be determined from the rate constant equation. The concentration of ammonium carbonate after 39 s will be 0.003 M.

Rate constant of a reaction is the rate of reaction when one molar concentration of the reactant is involved in the reaction. The expression for the rate constant k for first order reaction is :

k = 1/t ln (C0/Ct)

Where C0 be the initial concentration and Ct be the concentration after t seconds.

Given that C0 of ammonium nitrate = 0.957 M

rate constant = 0.196 /s

t = 39 s.

The concentration after 39 seconds is calculated as follows:

0.196 /s = 1/39s ln (0.957 M / Ct)

Ct = 0.957 / (ln⁻¹ (0.196 × 39))

    = 0.003 M.

Therefore, the concentration of ammonium carbonate after 39 seconds will be 0.003 M.

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If actual yield and theoretical yield are same then the percent yield will be 100%. Generally, the actual yield is lower than the theoretical yield. Therefore the percent yield is  18.9%. The correct option is option A.

Percent yield is the percent ratio of actual yield to the theoretical yield.

Mathematically,

Percent yield= actual yield of a product÷ theoretical yield of the product

Actual Yield = 1.72g of NH3

Theoretical Yield = 9.10g of NH3

Percent yield= ( 1.72g ÷9.10)×100

Percent yield=18.9%

Therefore the percent yield is  18.9%. The correct option is option A.

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Taking into account the definition of molarity, the number of moles of MgCl₂ present in 60.0 mL of 0.100 M MgCl₂ solution is 0.006 moles.

Molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by:

molarity= number of moles of solute÷ volume

Molarity is expressed in units moles/L.

In this case, you have:

Replacing in the definition of molarity:

0.100 M=number of moles of MgCl₂÷ 0.06 L

Solving:

0.100 M × 0.06 L= number of moles of MgCl₂

0.006 moles= number of moles of MgCl₂

Finally, the number of moles of MgCl₂ is 0.006 moles.

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Answer:

Option A. 11

Explanation:

We'll begin by calculating the concentration of Hydroxide ion in the solution. This can be obtained as follow:

KOH (aq) —> K⁺(aq) + OH¯(aq)

From the balanced equation above,

1 mole of KOH produced 1 mole of OH¯.

Therefore, 1×10¯³ M KOH will also produce 1×10¯³ M OH¯.

Next, we shall determine the pOH of the solution. This can be obtained as follow:

Concentration of Hydroxide ion [OH¯] = 1×10¯³ M

pOH =?

pOH = –Log [OH¯]

pOH = –Log 1×10¯³

pOH = 3

Finally, we shall determine the pH of the solution. This can be obtained as follow:

pOH = 3

pH =?

pH + pOH = 14

pH + 3 = 14

Collect like terms

pH = 14 – 3

pH = 11

Therefore, the pH of the solution is 11