Question 3 please
How many mL of … are required…

First, we have to know the rules to recognize significant numbers:

Zeros between two non-zero digits ARE significant.

are

All non-zero numbers are significant.

Trailing zeros to the right of the decimal are significant.

Leading zeros are not significant.

Trailing zeros in a whole number with the decimal shown are significant.

Trailing zeros in a whole number with no decimal shown are not significant.

After these rules, we can say that 890 has only 2 significant numbers.

Answer: 2 significant digits

The pH established of the equilibrum is 7.

What is equilibrium?

equilibruim is a state in which opposing forces of influence are balanced.

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Based on the mole ratio of the reaction and the volume of the reactants used;

The amount of sodium hydroxide that reacted with hydrochloric acid is calculated from the mole ratio of the reaction between hydrochloric acid and sodium hydroxide.

The equation of the reaction is given as follows:

HCl (aq) + NaOH (aq) ---> NaCl + H₂O

The mole ratio of HCl and NaOH is 1 : 1

Moles of HCl in 24.40 cm³ of 0.120 mol dm of hydrochloric acid solution will be determined as follows:

Moles of HCl = 0.120 * 24.40 / 1000

Moles of HCl = 0.002928 moles

Thus moles of NaOH reacted = 0.002928 moles

The amount of sodium hydroxide unreacted in 200 cm³ solution is determined as follows:

Moles of sodium hydroxide unreacted in 25 cm³ solution = 0.002928 moles

Moles of sodium hydroxide unreacted in 200 cm³ solution = 0.002928 moles * 250 / 25

Moles of sodium hydroxide unreacted in 200 cm³ solution = 0.0234 moles.

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Vinegar or acetic acid(CH3COOH) has intermolecular forces  of hydrogen bonding, dipole-dipole interactions and dispersion force.

Intermolecular forces can be defined as the attractive and repulsive forces that arise between the molecules of a substance.

Intermolecular forces includes the electromagnetic forces of attraction or repulsion which act between atoms and other types of its close particles such as atoms or ions.

Vinegar or acetic acid(CH3COOH) has intermolecular forces  of hydrogen bonding, dipole-dipole interactions and dispersion force.

Vinegar or acetic acid(CH3COOH)  has an especially strong type of hydrogen bonding. In solid state, the molecules in the acetic acid form cyclic pairs connected by hydrogen bonds. Thus, making it to have a low volatility.

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Answer:

You would want a metal that transfered heat efficiently.

Explanation:

We use metal frying pans to cook our food because they conduct heat. They are conductors of heat, if it was not so, they could not be used for cooking food.

Hope this helps! :)

Using ideal gas laws and the balanced reaction equation for the combustion of butane, we can calculate that the volume of produced carbon dioxide will be 25.6 L.

The balanced reaction equation for butane combustion looks like this:

[tex]2C_{4} H_{10} + 13O_{2}[/tex] → [tex]8CO_{2}+10H_{2} O[/tex]

We can see that 2 moles of butane (M = 58 g/mol) produce 8 moles of carbon dioxide. This allows us to set up a proportion that we can use to calculate the amount of carbon dioxide produced by the combustion of 14.0 g of butane:

116 g of butane : 8 moles of carbon dioxide = 14.0 g of butane : X

X = 8 moles of carbon dioxide * 14.0 g / 116 g = 0.9655 mol of carbon dioxide

Now, using the ideal gas laws, we can calculate the volume of released carbon dioxide.

PV = nRT ⇒ V = nRT/P = 0.9655 mol * 0.08206 Latm/Kmol * (25 + 273) K / 0.922 atm = 25.6 L

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The Iupac Name of given three compounds are 3,4,5-trimethylheptane, 2,2,3,3-tetramethylpentane and 2,2- dimethyl-3-ethylpentane.

For (1),

The longest straight chain have 7 carbon compound and having single bond, suffix of this compound is Heptane. Now there are three functional group of methyl there for prefix is trimethyl. Overall the name of compound is 3,4,5-trimethylheptane.

The longest straight chain have 5 carbon compound and having single bond, suffix of this compound is pentane. Now there are four functional group of methyl there for prefix is tetramethyl. Overall the name of compound is 2,2,3,3-tetramethylpentane.

The longest straight chain have 5 carbon compound and having single bond, suffix of this compound is pentane. Now there are three functional group of methyl and ethyl so they write according to alphabetic order. Overall the name of compound is 2,2- dimethyl-3-ethylpentane.

Thus, we concluded that the The Iupac Name of given three compounds are 3,4,5-trimethylheptane, 2,2,3,3-tetramethylpentane and 2,2- dimethyl-3-ethylpentane.

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Taking into account the definition of dilution, you would take 5 mL of the 0.10 M solution of HCl and you have to add 5 mL of deionized water.

When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution. In this way, dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

0.10 M× Vi= 0.050 M× 10 mL

Solving:

Vi= (0.050 M× 10 mL)÷ 0.10 M

Vi= 5 mL

Finally, this means that you would take 5 mL of the 0.10 M solution of HCl. If you need to prepare 10 ml of 0.050 M, you have to add 5 mL of deionized water.

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A sphere surrounds the atomic nucleus called the s orbital. There are shells within the sphere where an electron is more likely to be discovered right now. 1s is the smallest sphere. Greater than the 1s orbital are the 2s and 3s orbitals.

Each p orbital has two lobes, that are located on either side of the plane of the nucleus. The three p orbitals are equal in terms of size, shape, and energy, but they differ in how the lobes are orientated. These three orbitals are referred to as 2px, 2py, and 2pz because the lobes are located along one of the x, y, or z-axis. Similar to s orbitals, p orbitals grow in size and energy as the primary quantum number rises (4p > 3p > 2p).

sp3 orbital: One of a group of hybrid orbitals that result from mathematically combining one s orbital and three p orbitals to create four new equivalent orbitals that are directed toward the corners of a regular tetrahedron.

One of the hybrid orbitals created when one s orbital and one p orbital are mathematically merged to create two new equivalent, perpendicular orbitals is the sp orbital. With the exception of being closer to the nucleus, sp orbitals resemble p orbitals in appearance.

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1) This is an Anion

2) This is a Cation

3) It is Neutral.

Atom: A chemical element is uniquely defined by its atoms, which are tiny pieces of substance. An atom is made up of a core nucleus and one or more negatively charged electrons that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present.

1) number of protons = 7

So, the atomic number = 7

N has an atomic number of 7.

charge = number of proton - number of electrons

= 7 - 10

= -3

So, this is an anion

symbol: N3-

atoms or ion: anion

number of protons = 7

number of electrons = 10

2) charge = +3

Pd has an atomic number of 46.

number of protons = 46

charge = number of proton - number of electrons

+3 = 46 - number of electron

number of electron = 43

since the charge is positive it is a cation

symbol: Pd3+

atoms or ion: cation

number of protons = 46

number of electrons = 43

3) number of protons is 28

So, the atomic number is 28

Ni has an atomic number of 28.

since it is neutral,

number of electron = number of proton = 28

symbol: Ni

atoms or ion: neutral atom

number of protons = 28

number of electrons = 28

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It eats food to get energy is NOT a necessary characteristic of a living thing

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Given:

displacement(x)=18.3m

time(t)=122s

Average speed(v)=x/t

=18.3/122

=0.15m/s

Therefore,the train's average speed=0.15m/s

Answer:

Silicone

Explanation:

Silicone matches all the things

The balanced reaction equations are given below. They are all examples of double displacement.

a) balanced reaction equation of the reaction between aqueous copper(II) nitrate and aqueous potassium hydroxide, resulting in the formation of solid copper(II) hydroxide and aqueous potassium nitrate

[tex]Cu(NO_{3} )_{2}(aq)+2KOH(aq)[/tex] → [tex]Cu(OH)_{2} (s) + 2KNO_{3}(aq)[/tex]

b) balanced reaction equation of the double displacement between gaseous boron cyanide and liquid water resulting in the formation of solid boric acid and gaseous hydrogen cyanide

[tex]2B(CN)_{3} (g) + 6H_{2} O[/tex] → [tex]2H_{3} BO_{3} (s)+6HCN(g)[/tex]

c) balanced reaction equation between solid calcium silicate and gaseous hydrogen fluoride resulting in the formation of gaseous silicon fluoride, solid calcium fluoride and liquid water

[tex]CaSiO_{3}(s) + 6HF (g)[/tex] → [tex]SiF_{4}(g)+CaF_{2}(s)+3H_{2}O(l)[/tex]

d) balanced reaction equation between cyanogen gas and liquid water resulting in formation of aqueous oxalic acid and gaseous ammonia

[tex](CN)_{2}(g) + 4H_{2} O (l)[/tex] → [tex]H_{2} C_{2} O_{4} (aq) +2NH_{3} (g)[/tex]

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The difference between covalent and ionic bonds is that covalent bonding allows atoms to share electrons, but ionic bonding cause electron transfer, leading the atoms to form ions (cations and anions), and these oppositely charged ions are attracted to each other.

Atoms combine to create compounds in order to complete their octet and to achieve stability. This can be done by combining with other atoms either by electron sharing or electron transfer from one atom to another. Therefore, covalent bonds are created when electrons are shared, whereas ionic bonds are created when electrons are transferred.

Ionic bonds are generally formed between metal and nonmetal atoms. Non-metallic atoms gain electrons to form a negatively charged ion, while metallic atoms lose electrons to form positively charged ions. An atom becomes a cation when one or more of its electrons are lost, while an atom forms an anion when one or more electrons are gained. Hence, an ionic bond is formed as a result of the electrostatic attraction between oppositely charged ions.

A covalent bond, on the other hand, is formed between non-metal atoms as a result of electron sharing.

Therefore, an ionic bond is an attraction between ions with opposite charges whereas a covalent bond is the sharing of electrons between atoms.

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The age of the granite given it contains 25% parent (uranium-235) and 75% daughter (lead-206) is 1408 million years

We'll begin by calculating the number of half lives that has elapsed. This can be obtained as follow:

2ⁿ = N₀ / N

2ⁿ = 100 / 25

2ⁿ = 4

2ⁿ = 2²

n = 2

The age of the granite can be obtained as follow:

n = t / t½

Cross multiply

t = n × t½

t = 2 × 704

t = 1408 million years

From the calculations made above, we can conclude that the age of the granite is 1408 million years

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No, this item is not made of pure silver because if it has been made from pure silver that it would have displaced only 1.16cm³ of water but due to the addition of some other low-density element it displaces 1.9cm³ of water.

For pure silver

density of pure silver is = 10.49 g/cm³

mass of silver = 12.2 gram

since, density = mass/volume

          volume = mass/density

                        = 12.2/10.49 cm³

                         = 1.16 cm³

But the actual displaced water is 1.9cm³, which means some other element of lower density has been added.

Therefore, it is clear that the given jewelry is not made of pure silver.

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Answer:

N-16

Explanation:

Atom has 7 protons so it's atomic number is 7, which is Nitrogen

so isotope is 7 + 9 = 16

then it's N-16

Answer:

Acceleration

Explanation:

A single electron from the outermost shell of this element moves to the outermost shell of an atom with seven electrons.

When forming ions elements typically gain or lose the minimum number of electrons required to make a complete octet. For example, fluorine has 7 valence electrons, so it is most likely to gain an electron and form an ion of charge At the outermost energy level he states 8 electrons must be reached for an atom to be stable. Particles smaller than an atom.

Ionization is the process by which ions are formed by gaining or losing electrons from atoms or molecules. When an atom or molecule receives an electron it becomes a negatively charged anion and when it loses an electron it becomes a positively charged cation. Energy can be lost or gained in the formation of ions.

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Answer:

The chemical reaction 2H2+O2→2H2O 2 H 2 + O 2 → 2 H 2 O is classified as a synthesis reaction.

Explanation:

 The correctly identified subatomic particle with its charge is  

The British physicist James Chadwick made the neutron discovery in 1932.

Neutrons are neutral subatomic particles that are a part of every atomic nucleus, except the exception of regular hydrogen. Its rest mass of 1.67927980 10-27 Kg is slightly larger than a proton but 1838.68 times greater than an electron. It has no electricity charge. The dense inner core of the atom is where protons and neutrons, collectively referred to as nucleons, are linked together and account for 99.9% of the mass of the atom.

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A material with density 2.7 g/ml and volume 35.6 ml would have a mass of 96.12 g

Given that,

Density (D) = 2.7 g/ml

Volume (V) = 35.6 ml

We need to find the mass (m) of the material

We know that,

D = m / V

D = Density

m = Mass

V = Volume

Substituting,

2.7 = m / 35.6

m = 2.7 * 35.6

m = 96.12 g

Thus, mass of the material is 96.12 g

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Theoretical mass (O₂)= H₂O₂ Volume×  H₂O₂ density× {( 1 mol O₂)/(2 mol H2O2)}×{( mol of  H₂O₂ /g  H₂O₂ )}

H2O2 Volume= 5 ml

Known density( H₂O₂ )= 1.02 g/ml

Molar mass ( H₂O₂ )= 34.01 g/mol

Reciprocal molar mass(  H₂O₂ )= 0.0294

Theoretical mass( O₂)= 5×1.02× 0.0294× 1/2= 0.0749 moles

Actual moles of O₂ and percentage of  H₂O₂

P= 753 mm Hg×1 atm/760 mm Hg= 0.991 atm

V= 45  ml× 1L /1000 ml= 0.045 L

n= PV/RT

Actual moles ( O₂)= (0.991×0.045)/(0.0821×296 K)= 0.0445/24.3016= 1.8×10^-3 moles

Percentage ( H₂O₂ )= Theoretical moles(O₂)×100= 0.0749×100= 7.49%

Mass of  H₂O₂ (percent)= 3%

Concentration by mass( H₂O₂ )= 3 gm H2O in 100 ml of H2O

Volume ( H₂O₂ )= 100 ml

1 mol ( H₂O₂ )= 34.02 g O2

(3g  H₂O₂ /100 ml Solution)×( 1 mol  H₂O₂ /34.02 g H2O2)

No. Of moles ( H₂O₂ )= 0.088 moles

Mass ( H₂O₂ )= 0.088 moles × 34.02 = 2.99 g

%  H₂O₂ = (2.99 g  H₂O₂ /100 ml Solution)×100= 2.99%

% error= (%  H₂O₂ from the bottle-experiment %  H₂O₂ )/(% H₂O₂ from bottle)×100

=[ (3-2.99)/(3) ]× 100= 0.34% error.

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A solution that is 20 mass % sugar will have highest density as density is directly proportional to mass and inversely proportional to volume. Thus option C is correct.

Density is defined as the degree to which a material is packed together

It can also be defined as substance mass per unit volume.

Density can be expressed as

Density = mass / volume

Thus, a  solution that is 20 mass % sugar will have highest density as density is directly proportional to mass and inversely proportional to volume. Thus option C is correct.

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Answer:

21.107

Explanation:

because this answer gives you 10 and also 90

Answer:

false

Explanation:

can carry heat, not communication

The percentage by mass of hydrogen in the Compound that is formed is found to be 5% if 1.0g of hydrogen reacts Completely with 19.0g of fluorine.

A component in a particular combination or a concentration can be described using the mass percent symbol. The mass of solute contained in a specific mass of solution is indicated by the mass percentage used to characterize the solution composition. The concentration of the solute is expressed in terms of mass or moles.

As a mass percentage, an element's concentration in a compound or component of a combination can be represented. The mass percentage is calculated by multiplying the result by 100% after dividing the combined mass by the masses of each component. Also called Mass Percent or (w/w) Percent.

[tex]\frac{1}{2} H_{2} + \frac{1}{2} F_{2}[/tex] →[tex]HF[/tex]

Percentage by mass hydrogen

= (Mass of hydrogen) / (Mass of Hydrogen fluoride) x 100%

= [tex]\frac{1}{20}[/tex] x 100%

=5%

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Dispersion forces and dipole-dipole forces are present in pure samples of both ch₃ch₂ch₂f and ch₃ch₂ch₂oh.

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1. Iceberg

2. The iceberg is more underwater than the ship.

Thanks to radar technology better crew training and iceberg monitoring systems, ship collisions with icebergs are generally avoidable, but when a collision does occur, the consequences can be devastating. These things are very rare. One of the rare but high-impact risks. The Titanic was neither the first nor the last ship to hit an iceberg and sink.

Here are the ten most sunk ships in the world in terms of lives lost due to iceberg accidents. A second study by British historian Tim Martin argued that atmospheric conditions on the night of the disaster may have caused a phenomenon called super refraction. This diffraction of light may have created a mirage or optical illusion that obscured the iceberg from the Titanic's vantage point.

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