How can you use the periodic table to predict reactivity?

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The specific heat capacity of the metal rod weighing 123g is 0.14 J/gºC (option B).

The specific heat capacity of a metal substance can be calculated using the following formula:

Q = mc∆T

Where;

However, in a calorimeter, the metal and water relationship is given as follows:

Q (water) = - Q (metal)

mc∆T (water) = - mc∆T (metal)

Mass of water = density × volume

Mass of water = 1g/mL × 75mL = 75g

75 × 4.184 × {29°C - 25°C} = - {123 × c × (29 - 100)}

1255.2 = 8733c

c = 1255.2/8733

c = 0.144J/g°C

Therefore, the specific heat capacity of the metal rod weighing 123g is 0.14 J/gºC.

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Answer:

Particles is a gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.

Explanation:

The wavelength of the radiation emitted by the argon ion laser is \(4.854 * 10^-7 m\).

Wavelength is a property of any type of wave that refers to the distance between two adjacent points on the wave that is in phase, i.e., at the same point in their respective cycles. It is usually denoted by the Greek letter lambda (λ) and is measured in units of length, such as meters or nanometers.

The energy carried by the photon (E) is related to the wavelength (\(\lambda\)) through the following equation:

\(E=hc/\lambda\); where 'h' is the Plank's Constant and 'c' is the speed of light which is \(3* 10^{-7} m/s\).

We can say that

\(\lambda - hc/E\)

Now after substituting the given values, we get:

\(\lambda = (6.626 * 10^{-34} J.s * 3.00 * 10^8 m/s) / (4.071 * 10^{-19} J)\\\lambda = 4.854 * 10^-7 m\)

Therefore the wavelength of the radiation emitted by the argon ion laser is \(4.854 * 10^-7 m\).

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Answer: 98.7 L

Explanation:

Since the atomic mass of argon is 39.948 g/mol, 2.62 grams of argon gas is the same as moles.

We can now set up a proportion to solve for the volume.

\(\frac{V}{1.25}=\frac{5.18}{0.065585260839091}\\\\V=98.7 \text{ } L\)

As per the balanced equation of the reaction one mole of Mg give s one mole of H2. 1.10 g of magnesium is 0.045 moles. Thus it gives 0.045 moles of H2 which is 1.02 litres.

Magnesium chloride is an ionic compound formed by the reaction of magnesium metal with two moles of hydrochloric acid. The reaction also produce one mole  hydrogen gas.

The atomic mass of magnesium is 24 g/mol. Thus number of moles in 1.10 g is 1.10/24 = 0.045 moles.

As per the reaction equation one mole of magnesium gives one mole of hydrogen gas. Thus 0.045 moles of magnesium gives 0.045 moles of hydrogen gas.

At STP, the volume of one mole of any gas will be equal to 22.4 L. Thus volume of 0.045 moles of hydrogen at STP is:

volume = 0.045 × 22.4

             =1.02 L.

Hence, the volume of hydrogen produce here is 1.02 L.

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Subaquatic soil can be classified as sediment or soil based on its geological properties and formation processes.

Sediment refers to any material that is transported and deposited by water, wind, ice, or gravity. Sediments can be composed of various materials, such as minerals, rocks, organic matter, and even human-made debris.

Sediments can accumulate in different environments, such as rivers, lakes, oceans, and deserts, and can be deposited in layers over time.

Subaquatic soil can be classified as sediment or soil based on its geological properties and formation processes. If it has primarily formed through sediment deposition, it is more appropriate to classify it as sediment.

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Answer:

BORON

Ionization energy decreases down the group and going from left to right the period,

Luckily you have the elements from the same group that is Group III A also called boron family,

The position of Elements in this group are

so keeping rules in mind the first element in the group has highest I.E. that is boron

Answer:

1.) zinc and aluminum

2.)

a.) The old coating was made of tin.

b.) Aluminum would be a good choice for repairing the fracture.

4) The volume of the HCl used is 9.500 mL while the volume of the NaOH used is 3.800 mL.

5) Molarity of sodium hydroxide is obtained from; Molarity of HCl * 1/2

By reacting an unknown component with a known quantity of a different chemical known as a titrant, titration is a laboratory procedure used to measure the concentration of an unknown substance, often a solute dissolved in a liquid.

The endpoint of a titration can be detected in a number of ways, depending on the specific titration being performed.

4)

Volume of the Acid used = Initial reading - Final reading = 25.00 - 15.50 = 9.500 mL

Volume of the base used = 8.80 - 5.00 = 3.800 mL

5)

We know that the mole ratio is 1:2 and the implication of this is that the set up to obtain the molarity of the sodium hydroxide solution is Molarity of HCl * 1/2

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The balanced half reaction for the redox reaction of Zn with O2 is,

Oxidation: 2 Zn -------> 2 Zn+2 + 4 e-

Reduction: O2 + 4 e-  ---------> 2O-2

What is redox reaction?

Redox reaction includes both oxidation and reduction happening simultaneously where the number of electrons lost in the oxidation is equal to the number of electrons gained in the reduction. There is change in oxidation number of the species involved in redox reaction.

The half cell reaction for redox reaction can be written as,

Zn -------> Zn+2 + 2 e-

Here Zn is undergoing oxidation by losing 2 electrons.

O2 + 4 e-  ---------> 2O-2

Here O2 is undergoing reduction by gaining electrons. To make the number of electrons equal the oxidation half cell reaction is multiplied by 2.

Therefore, the redox reaction can be written in half cell reaction as,

Oxidation: 2 Zn -------> 2 Zn+2 + 4 e-

Reduction: O2 + 4 e-  ---------> 2O-2

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Answer:

Non-metal

Explanation:

A non-metal is a substance that possesses the following characteristics:

- It is brittle i.e can break easily

- It does not conduct heat and electricity

- It is not lustrous i.e does not shine when polished.

According to this question, LEEN was observing the physical properties of elements in order to classify them. He found that the first element was dull, brittle, and did not conduct heat. This makes it a NON-METAL.

The conversion of 1690 cm^-1 to µm is 6µm

The first overtone is 3380cm^-1

a. Given that:

We want to make a conversion from cm^-1 to µm

Wave numbers in cm^-1 is 10,000/µm

Let x and y be two numbers

xcm^-1 = 10^4/Yµm

Yµm= 10^4/xcm^-1

Expanding

10^4/1690

=6µm.

b. If the fundamental frequency is 1690 cm^-1

The first overtone is equal to the second harmonic

If the fundamental frequency is F

First overtone = F2

Then F2 = 2F

Therefore, the first overtone is 2 x 1690 =3380cm^-1

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The pOH of the 0.001 M NaOH solution is approximately 3.

To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.

In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.

The pOH is calculated using the equation:

pOH = -log[OH-]

Substituting the concentration of hydroxide ions, we have:

pOH = -log(0.001)

Using a calculator, we can evaluate the logarithm:

pOH ≈ 3

Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.

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Answer:

The mass of 2 moles of carbon tetrachloride is

307.646 grams

Explanation:

The chemical formula for Carbon tetrachloride is \(\ce{CCl_4}\).  It contains 1 carbon atom and 4 chlorine atoms.

Carbon tetrachloride is formed due to the covalent bond between one carbon atom with four chlorine atoms.

In order to find the mass of 2 moles of \(\ce{CCl_4}\) we need to determine the molar mass.

The molar mass of carbon is 12.011 g/mol.

The molar mass of chlorine is 35.453 g/mol.

As stated before we have 1 carbon atom and 4 chlorine atoms. So the molar mass can be evaluated by

\(\left(1*12.011\right)+\left(35.453*4\right)=153.823\)

The molar mass of \(\ce{CCl_4}\) is 153.823 g/mol.

You can multiply that by 2 to get the mass in grams of 2 moles of carbon tetrachloride.

\(2*153.823 =307.646\)

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The concept Avogadro's law is used here to determine the moles of gas present in the sample. Avogadro's law is also known as the Avogadro's principle or Avogadro's hypothesis. It is closely related to the ideal gas equation.

According to Avogadro's law, equal volumes of all gases under similar conditions of temperature and pressure contain equal number of molecules. It follows that the volume of the gas is directly proportional to the number of molecules.

The equation is:

V₁n₁ = V₂n₂

n₂ = V₁n₁ / V₂

3.80 × 1.70 / 1.45 = 4.45

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Answer:

0.3mL

Explanation:

Mass = 0.30mg

Concentration = 1.0 mg/mL

Volume = x

The relationship between the three parameters is given as;

Concentration = Mass / Volume

Making Volume our subject of interest we have;

Volume = Mass / Concentration

Substituting the values we have;

Volume = 0.30 mg / 1 mg/mL = 0.3mL

The amount, in kJ, of heat needed to completely vaporize 50.0g of water at 100°C is 118.8 kJ.

The heat needed to completely vaporize 50.0g of water at 100°C can be calculated using the following formula:

q = m x Hv

where:

First, we need to convert 50.0g to moles by dividing by the molar mass of water which is approximately 18.015 g/mol3:

moles of water = 50.0 g / 18.015 g/mol moles of water = 2.776 mol

Thus:

q = (2.776 mol) x (40.65 kJ/mol) q = 112.8 kJ

In other words, 112.8 kJ of heat is needed to completely vaporize 50.0g of water at 100°C.

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The correct answer is C. Surface craters

Explanation:

Short-term environmental changes involve temporary changes and effects in the ecosystem, which are mainly minor. In the case of a small asteroid or comet, this will likely lead to surface craters or changes in the surface of the impact zone. This is because the craters and asteroids impact the surface at hight speed. Also, because this is a minor event it might lead to the death of some organisms but not the extinction of these and it is not expected this has major effects such as changes in weather. Thus, the short-term effect that this will most likely cause is "surface craters."

Answer:

surface

Explanation:

Answer: There are \(16.14 \times 10^{23}\) atoms of hydrogen are present in 40g of urea, \((NH_{2})_{2}CO\).

Explanation:

Given: Mass of urea = 40 g

Number of moles is the mass of substance divided by its molar mass.

First, moles of urea (molar mass = 60 g/mol) are calculated as follows.

\(Moles = \frac{mass}{molar mass}\\= \frac{40 g}{60 g/mol}\\= 0.67 mol\)

According to the mole concept, 1 mole of every substance contains \(6.022 \times 10^{23}\) atoms.

So, the number of atoms present in 0.67 moles are as follows.

\(0.67 mol \times 6.022 \times 10^{23} atoms/mol\\= 4.035 \times 10^{23} atoms\)

In a molecule of urea there are 4 hydrogen atoms. Hence, number of hydrogen atoms present in 40 g of urea is as follows.

\(4 \times 4.035 \times 10^{23} atoms\\= 16.14 \times 10^{23} atoms\)

Thus, we can conclude that there are \(16.14 \times 10^{23}\) atoms of hydrogen are present in 40g of urea, \((NH_{2})_{2}CO\).

Answer:

2.31 \(m\) C₆H₁₂O₆

Explanation:

Hope this helps

The molality of a fructose will be 2.31 M.

The term "total moles of a solute present in a kilogram of a solvent" is used to describe molality. The terms "molality" and "molal concentration"

Molality can be determined by the formula:

Molality = solute (n) / solvent (w) Kg

Given data:

Mass of fructose = 12.9 g

Mass of solvent = 31.0 g

Now, put the value of given data in molality equation.

Molality = 12.9/180 × 31 × \(10^{-3}\)

Molality = 0.00231  × \(10^{-3}\)

Molality = 2.31 M

Therefore, the molality of a fructose will be 2.31 M.

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Answer:

15.12g

Explanation:

Given parameters:

Number of moles  = 0.4moles

Unknown:

Mass of the compound  = ?

Solution:

To solve this problem;

   Mass  = number of moles x molar mass

 Molar mass of NaBH₄   = 23 + 10.8 + 4(1)  = 37.8g/mol

 Mass of the compound  = 0.4 x 37.8  = 15.12g

Answer:

The answer is 15.12 g but if you are taking this test on ck12 make sure you round it to 15 like it says on the directions :) good luck

An instantaneous dipole occurs when a molecule's moving electrons are briefly more concentrated in one place than another, causing the molecule to become temporarily polarized.

The correct option is True.

Dipoles refer to a separation of charges where one end of a substance has a  positive charge while the other end has a negative charge.

In chemical compounds, dipoles occur within a molecule that has covalently bonded atoms or atoms that share electrons in the covalent bond.

The dipole may be permanent dipoles or temporary dipoles.

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Answer:

Explanation:

1.1 we have to find mass of Na3PO4;

for that we have to Calculate the moles of Na3PO4 needed:

volume is 100mL = 0.1L

Molar concentration = Moles of solute / Volume of solution in L

0.1 mol/L = Moles of Na3PO4 / 0.1 L

Moles of Na3PO4 = 0.1 mol/L * 0.1 L

Moles of Na3PO4 = 0.01 mol

Now, Calculate the mass of Na3PO4 needed:

so, Mass = Moles of Na3PO4 * Molar mass of Na3PO4

Mass = 0.01 mol * 164 g/mol

Mass = 1.64 g of Na3PO4.

1.2 materials and glassware needed:

1.64 g Sodium phosphate (Na3PO4)

100 mL volumetric flask

weighing balance

Distilled water

Glass rod

Pipette and burette

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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Answer:

100,000

Explanation:

1 kilometer equals 100,000 centimeters

You multiply the length value by 100,000

Answer:

One kilometre is 100,000 centimeters

Explanation:

Answer:

Carbon is the only element that can form so many different compounds because each carbon atom can form four chemical bonds to other atoms ,and because the carbon atom is just the right ,small size to fit in comfortably as parts of a very large molecules.

hope this helps :) !!!

Answer:

100 degree is the answer of given statement

Two key criteria that engineers must prioritize are efficiency and safety. By emphasizing efficiency and safety during process development, engineers can create robust and reliable processes that not only maximize productivity but also prioritize the well-being of personnel and the environment.

When developing a process, engineers need to consider several important criteria. Two key criteria that engineers must prioritize are efficiency and safety.

Efficiency is crucial in process development to ensure optimal use of resources, time, and energy. Engineers strive to design processes that maximize productivity, minimize waste, and reduce costs. This involves optimizing reaction conditions, streamlining workflow, and implementing automation where possible. Efficiency considerations also extend to energy consumption, raw material utilization, and overall process sustainability.

Safety is another critical aspect that engineers must prioritize. They need to identify and mitigate potential hazards associated with the process, ensuring the safety of both personnel and the environment. This involves conducting thorough risk assessments, implementing safety protocols, and designing equipment and systems with safety features. Engineers must also consider the safe handling and storage of materials, as well as potential risks during transportation and disposal.

By emphasizing efficiency and safety during process development, engineers can create robust and reliable processes that not only maximize productivity but also prioritize the well-being of personnel and the environment.

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