express the following in regular and scientific notation using 4 significant digits 0.00045

After adding the next amounts of NH, the final solution's pH was 4.98. Strong acid plus weak base equals an acidic pH, which is supported by this.

If you'll note, NH3 and HNO3 have the same volume and concentration, while HNO3 only contains one H.

As a result, you should persuade yourself that these react exactly as they should because their mol quantities are equivalent.

Make use of the following equation to determine pH:

pH = -log [H+]

The pH formula can be used to determine the pH of a chemical solution and how acidic or basic it is: pH equals -log10[H 3 O +]. Anything below 7 is acidic, and everything over 7 is basic. Learn how to calculate the pH of any chemical solution using the procedures listed below.

To Identify pH true meaning:

The concentration of hydrogen ions in a solution is determined by the pH scale. A solution having a lot of hydrogen ions in it is acidic. Normally, the pH scale is displayed from 0 to 14. The solution is more straightforward the larger the number.

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Answer:

Explanation: I have included a picture of the concept map. Feel free to ask any questions.

Higher lattice energy means that more force is needed to break the ionic solid apart into its individual ions. Ionic bonding hence becomes stronger than lattice energy increases.

The energy that changes when one mole of a crystalline ionic compound is formed from its component ions, which are believed to begin to be in the gaseous state, is known as the lattice energy. It gauges the cohesive forces that hold ionic solids together.

One mole of a solid ionic compound can be formed when gaseous ions react, releasing a particular amount of energy. Lattice energy can also be used to describe the energy required to aid the dissociation of one mole of a solid ionic compound into its component gaseous ions.

Thus, Ionic bonding hence becomes stronger than lattice energy increases.

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20.0M

Given the following parameters;

Moles of solute = 0.5moles

Volume of the solvent = 25mL = 0.025L

Required parameter

Molarity of the resulting solution

The formula for calculating the molarity of the solution is expressed as:

n is the moles of solute

v is the volume of solvent

Substitute the given parameters into the formula to have:

Therefore the molarity of the resulting solution is 20.0M

Considering the mechanism -

Step 1: A + B → AB

Step 2: AB + C → AC + B

Overall: A + C → AC

Here AB is the intermediate and B is a catalyst.

AB is an intermediate of the reaction because it is formed and completely utilized in the reaction mixture by itself.

A catalyst is a type of species which is added to the reaction mixture but it remains unchanged as it do not participate in the overall reaction. A catalyst helps the reaction to form the products at a faster rate.

Intermediate is formed from the reactants which interacts to produce immediately visible products of a chemical reaction, while catalyst results in speeding up of a chemical reaction and it is not consumed in the reaction.

Complete question is -

Macmillan Learning

Consider the mechanism.

Step 1: A + B → AB

Step 2: AB + C → AC + B

Overall: A + C → AC

Which species is an intermediate?

A

AB

AC

B

Which species is a catalyst?

AC

B

AB

A

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The frequency of a radio wave with an energy of 8.3 x 10⁻²⁴ J  is 1.25 x 10¹⁰ Hz.

Energy is directly proportional to the frequency. The relationship between energy and frequency can be given as -

E = hν

where,

E = energy

h = Planck's constant

ν = frequency

Waves carries energy. Therefore, the energy carried by the waves is related to the frequency and their amplitude.

If the frequency is higher, energy will be more for a wave. If wavelength increases, the energy and the frequency gradually decreases.

We know that,

E = 8.3 x 10⁻²⁴ J

h = 6.62 x 10⁻³⁴

We will calculate frequency using the above equation,

E = hν

ν = E

     h

ν = 8.3 x 10⁻²⁴

     6.62 x 10⁻³⁴

ν = 1.25 x 10¹⁰ Hz

Hence, the frequency of radio wave is 1.25 x 10¹⁰ Hz.

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It will take 3.07 m long to reach at its maximum height.

The volleyball will reach at the  maximum height at 0.673 s after it is served.The  Calculating for the height the volleyball  will reach before going to  downwards. Therefore the volleyball will do have a maximum height of 3.07 m  with respect to the ground.

3.78 m Ignoring resistance, the ball will travel upwards until it's velocity is 0 m/s. So we'll first calculate how many seconds that takes.

7.2 m/s / 9.81 m/s^2 = 0.77945s

 The distance traveled is given by the formula d = 1/2 AT^2, so substitute the known value for A and T, giving

d = 1/2 A T^2 d = 1/2 9.81 m/s^2 (0.77945 s)^2 d = 4.905 m/s^2 0.607542 s^2 d = 2.979995

m So the volleyball will travel 2.979995 meters straight up from the point upon which it was launched. So we need to add the 0.80 meters initial height.

d = 2.979995 m + 0.8 m = 3.779995

m Rounding to 2 decimal places gives us 3.78 m.

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0.25 Molarity of lead nitrate aqueous solution is there when a solution of nacl is added slowly to  a solution of lead nitrate.

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Based on the concentration and volume of reactants:

The concentration of each of the ions in the solution at the end of the reaction is calculated as follows:

Equation of reaction : ZnCl₂ + 2 NaOH —> Zn(OH)₂ + 2 NaCl

moles of ZnCl₂ = 250/1000 * 0.65

moles of ZnCl₂ = 0.1625 moles

Moles of NaOH = 200/1000 * 0.750

moles of NaOH = 0.15 moles

NaOH is the limiting reactant

Moles of Zn(OH)₂ formed = 0.15 / 2

Moles of Zn(OH)₂ formed = 0.075 moles

final volume of solution = 450 ml

the concentration of Na⁺ ion in solution = 0.15/450

concentration of Na⁺ ion = 0.333 M

concentration of Cl⁻ in solution = 0.1625 * 2 / 450

concentration of Cl⁻ = 0.722 M

concentration of Zn²⁺ left = (0.1625 - 0.15)/450

concentration of Zn²⁺ = 0.028 M

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Step 1 - Understanding the equilibrium constant

For a chemical reaction:

The equilibrium constant would be:

We need to be careful because pure liquids and solids do not enter the equilibrium constant.

Step 2 - Finding the equilibrium constant for the given reaction

For this reaction:

We can see that all substances are in the gaseous state. Therefore, all substances will enter the equilibrium constant. The equilibrium constant in this case will be:

The correct answer is thus alternative e).

This describes a fission chain reaction:

Initially, the reaction starts with the fission of an atom with an unstable nucleus. In fission, neutrons are produced, and they travel through the surrounding medium. Eventually, they meet other atoms and they are captured by their nuclei: the nuclei become unstable and they undergo fission as well.

The order will be: answer

1) One atom undergoes fission.

2) A number of neutrons are produced.

3) Each neutron finds another atom.

4) A number of atoms undergo fission.

Answer:

12 +12 24

Explanation:

explationnnnnn ph 0.15=30

Answer:

3N H

    2  2 (The 2 goes in the spaces for the lower numbers)

Explanation:

Answer:below

Explanation:

Some of the properties of covalent bonds are: Covalent bonding does not result in the formation of new electrons. The bond only pairs them. They are very powerful chemical bonds that exist between atoms.

An unknown compound is analyzed gravimetrically and found to contain 77.6 ± 0.1 % of bromine. Molecular formula is NaBr (sodium bromide)

This is further explained below.

Generally,  Here given the 77.6+1-0.1 \%bromine Mass percentage of [tex]$\mathrm{Br}$ in $\mathrm{NaBr}=\frac{79.9}{102.89} \times 100$[/tex]

=0.776 *100

=77.6%

Therefore the mass percentage of Br in NaBr is 77.6 % matched with the given bromine mass percentage 77.6 [tex]\pm[/tex]0.1 %

Mass percentage of

[tex]$$\begin{aligned}\mathrm{Br} \text { in } \mathrm{KBr} &=\frac{79.9}{119} \times 100 \\&=0.671 \times 100 \\&=67.1 \%\end{aligned}$$[/tex]

Mass percentage of Br in CaBr_2[tex]=\frac{159.8}{199.8} \times 100$$=79.9 \%$[/tex]

Therefore, the mass % of B_r in k B r on d CaBr_2 is a hot match with the given mass % $77.6[tex]\pm[/tex] 0.10%

Therefore, the Molecular formula of an unknown salt is NaBr

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The given reaction is exothermic, we know igt because of the sign of the change in enthalpy given by the question, which is negative.

Exothermic reactions have negative changes in enthalpy.

The change in enthalpy can be found by multiplying the given amount of moles of aluminium by the given change in enthalpy:

The change in enthalpy is -6902kJ.

Answer:

24.53 °C

Explanation:

To find the final temperature, you need to use the following equation:

Q = mc(T₂ - T₁)

In this equation,

-----> Q = heat (J)

-----> m = mass (g)

-----> c = specific heat (J/g°C)

-----> T₂ = final temperature (°C)

-----> T₁ = initial temperature (°C)

Using the given values, you can rearrange the equation and simplify to find "T₂".

Q = 950.0 J                              T₂ = ? °C

m = 680.1 g                               T₁ = 24.20 °C

c = 4.184 J/g°C

Q = mc(T₂ - T₁)                                                      <----- Given equation

950.0 J = (680.1 g)(4.184 J/g°C)(T₂ - 24.20°C)    <----- Insert values

950.0 J = 2845(T₂ - 24.20°C)                              <----- Multiply 680.1 and 4.184

0.3339 = T₂ - 24.20°C                                          <----- Divide 950.0 by 2845

24.53 = T₂                                                             <----- Add 24.20 to both sides

Answer:

N5Br3

Explanation:

The volume of the sodium hydroxide solution required is 4.9 * 10^-5 L.

We know that the reaction between the sodium hydroxide in aqueous solution and para-nitrophenol is a 1:1 reaction. We now have to find the volume of the sodium hydroxide solution that must be added to the solution in order to ensure that formation of the yellow anion is complete.

We should know that the reaction is equimolar so we can write that;

0.105 M * V =  7.20 × 10−4 g/ 139 g/mol

V = 7.20 × 10−4 g/ 139 g/mol/0.105 M

V = 4.9 * 10^-5 L

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A system does 571 kJ of work and loses 276 kJ of heat to the surroundings. thus,  the internal energy change is -847kj .

The internal energy, which results from the molecular state of motion of matter, is an energy form that exists in every system. The internal energy is denoted by the letter U, and the measurement unit is the joule (J).

Rising temperature and changes in state or phase from solid to liquid and liquid to gas cause a rise in internal energy. Planetary bodies can be viewed as a fusion of heat engines and heat reservoirs. Internal energy E is stored in the heat reservoirs, and some of it is converted into different kinds of mechanical, electrical, and chemical energies by the heat engines.

Given ,

the work done by the system is 571KJ.  

and heat energy loses to the surrounding is 276kj .

Now , according to the 1st law of thermodynamics , the internal energy change is given by ,

ΔU = Q -W = -276KJ - 571KJ = -847kj

Hence the internal energy change is -847kj .

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Answer:

Explanation:

Here, we want to getthe new pressure

From Boyles' law, we know that the volume of a given mass of gas is inversely proprttional to the pressure at a constant temperature

Mathematically:

where:

P1 is the initial pressure hich is 1.6 atm

P2 is the final pressure which is 744 mmHg (converting to atm by dividing by 760 mmHg, we have the aluea as 744/760 = 0.98 atm

V1 is 45 ml

V2 is ?

Now, the gas expanded from 73. mL to 125 mL

The initial pressure woud now be 0.98 atm

Thus, we have the new pressure as:

The thing that formed the novae on Venus is As a result of the interaction between mantle diapirs and the lithosphere and radial fracture brought on by the emplacement of novae are believed to have formed.

The parts of the text that relate to the questions  are:

Novae on Venus similar to the landforms in Gerya’s computer model as the model's output corresponded to Venusian novae. This supported Gerya's hypothesis that novae may emerge as melted rock was allowed to push up toward the surface due to a thinner crust and higher surface temperature.

Venus has dome-shaped features called novae. They have cracks radiating from their centers in all directions, making them simple to observe from above. The plural of the word "nova" is "novae."

As a result of the interaction of mantle diapirs with the lithosphere and radial fracture brought on by the emplacement of novae are believed to have formed.

Note that Venus planet is comparable to Earth on the inside and is a tad smaller than Earth. Venus's surface is obscured by dense clouds, so we can't see it from Earth. However, its space missions have revealed that its surface is covered with craters, volcanoes, mountains, and other geological features.

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Answer:

10 electrons in an atom can have the quantum numbers in n=3 and l=2.

Explanation:

In the principal quantum number n=3, we can have, within the orbital quantum number l=2, a maximum of 10 electrons, because there, electrons can be located in the 3d orbital.

Answer:

sodium carbonate

Explanation:

sodium carbonate

Answer:

27 s.

Explanation:

We have to do the calculations with the right units, so let's convert from 119 lb to kg. Remember that 1 lb equals 0.454 kg. Based on this information we can state a rule of three and the conversion will look like this:

Now, we have to do a dimensional analysis to obtain the answer. We want to find the time that this person falls off a hill, and time is in seconds, so we have to 'cancel' the mass in kg to obtain seconds and this would be a multiplication. A 2 kg mass falls in one second, this multiplied by the mass of the person is:

The answer would be 27 s.

Answer:

For pure substances, the mass and volume will always be the same or will always change the same way because all substance are the same throughout.

While for mixtures, you can have varying amount of each component therefore mass and volume will not change the same way for substances

Sugar has high solubility than salt and baking soda due to the big size of sugar molecules as compared to the molecules of dissolved salt and baking soda.

Sugar has high solubility than salt because the sugar molecules are bigger than the molecules of dissolved salt. This allows more water molecules to surround a single particle of sugar that pulling it into a solution faster as compared to salt and baking soda. Sugar dissolves in water due to high solubility because energy is given when the partially polar sucrose molecules can result in the formation of intermolecular bonds with the polar water molecules. The weak bonds that form between the sugar and the water needed the energy to break the structure of both the pure solute which is sugar and the solvent i.e. water.

So we can conclude that the sugar molecules have large than the molecules of dissolved salt, so that's why Sugar has high solubility than salt and baking soda

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ANSWER

Oxygen

EXPLANATION

Magma is the molten or semi-molten natural materials from which all igneous rock is formed

Magma is composed of a mixture of molten materials with varying amounts of dissolved gases and small amount of solid materials.

Magma contains 46.6% of oxygen which is more than half of the total dissolved gases

Therefore, the most abundant element in magma is oxygen

Answer

Reaction type = Double displacement.

Explanation

Solution:

Reaction type = Double displacement.