what is the organization that regulates the safety of Bluetooth and other wireless devices

Answer: F. CaCl2

Explanation:

Calcium Chloride (CaCl2) is an ionic compound. In an aqueous state,this compound is a good conductor of electricity.

The C-14/C-12 ratio is used to date once-living organisms because C-12 is fixed value of any organisms but the value of C-14 is constantly decreasing by time  and so  every organism have their specific ratio of  C14/C12 .

Carbon-12 and carbon-14 are two isotopes of the element carbon. The difference between carbon-12 and carbon-14 is the number of neutrons in each of their atoms.

Because of the different number of neutrons, carbon-12 and carbon-14 differ in terms of radioactivity. Carbon-12 is a stable isotope carbon-14, on the other hand, undergoes radioactive decay:

146C → 147N + 0-1e

C-12 is fixed value of any organisms but the value of C-14 is constantly decreasing by time  and so  every organism have their specific ratio of  C14/C12 ,hence due to this reason the C-14/C-12 ratio used to date once-living organisms .

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Final answer:

The C-14/C-12 ratio is used to date once-living organisms by comparing the ratios in living and deceased organisms to calculate the age.

Explanation:

The C-14/C-12 ratio is used to date once-living organisms because after death, the C-14 isotope decays at a known rate, leading to a decrease in the ratio. By comparing this ratio to the ratio in living organisms, scientists can determine the age of the once-living organism by calculating the number of half-lives that have passed.

hydrargyrum , hg swiftplanet, quicksliver

Explanation:

Answer:

Mercury is used in thermometers, barometers, manometers, sphygmomanometers, float valves, mercury switches, mercury relays, fluorescent lamps and other devices, though concerns about the element's toxicity have led to mercury thermometers and sphygmomanometers being largely phased out in clinical environments in favor ...

Explanation:

i know this will help because i got this right

Answer:

The number of atoms  in 10 g of Pb is 2.9064 × 10²² atoms

Explanation:

According to Avogadro's constant, one mole of a substance contains exactly 6.02214076 × 10²³ particles such as molecules, atoms or ions.

Here we have lead, Pb, which is an uncombined element, therefore, the number of moles present in 10 g of lead can be found as follows;  

Molar mass of lead = 207.2 g/mol

Mass of lead sample = 10 g

[tex]Number \, of \, moles, \, n, \, of \, lead \, present = \frac{Mass \, of \, lead}{Molar \, mass \, of \, lead} = \frac{10 \, g}{207.2 \, g/mol} = 0.04826 \ moles[/tex]

Therefore, number of atoms in 10 g of lead is found by multiplying the number of moles by the Avogadro's number as follows;

Number of atoms = Number of moles × Avogadro's number

∴ Number of atoms  in 10 g of Pb = 0.04826 × 6.02214076 × 10²³ = 2.9064 × 10²² atoms.

The number of atoms  in 10 g of Pb = 2.9064 × 10²² atoms.

Answer:

2.9 ×10^22 atoms of lead.

Explanation:

Now, we have to make use of the Avogadro's number. Remember that according to professor Avogadro, the mole refers to the amount of substance that contains the same number of elementary entities as 12 grams of carbon-12.

The number of elementary particles (atoms, ions, molecules etc) present is one mole of a substance is equal to the Avogadro's number. Hence one mole of a substance contains Avogadro's number of elementary entities.

Now one mole of lead has a mass of 207.2 gmol-1. One mole of lead contains 6.02×10^23 atoms (Avogadro's number) of atoms.

Hence if 207.2 g of lead contains 6.02×10^23 atoms of lead

10.0 g of lead will contain 10.0 × 6.02×10^23 / 207.2 = 2.9 ×10^22 atoms of lead.

Hence 10.0g of lead contains 2.9 ×10^22 atoms of lead.

Answer:

the ph is 13.54

ur welcome

Explanation:

Based on the data provided, the pH of the H2SO4 solution is 1.62

The pH of a solution is the negative logarithm to base ten of the hydrogen ions concentration of the solution .

Mathematically, pH = - log [H+]

The pH is calculated from the molarity of the solution.

number of moles of H2SO4 = 3.25/98.08 = 0.0331 moles

Molarity of the H2SO4 solution = 0.0331/2.75 = 0.012 M

Since H2SO4 us a diprotic acid, [H+] = 2 × 0.012 = 0.024

Then;

pH = -log(0.024)

pH = 1.62

Therefore, the pH of the H2SO4 solution is 1.62

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Answer:

D. 1

Explanation:

Hydrogen is the chemical element with the symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table. Hydrogen is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass.

Answer:

D.1 is the correct answer

Explanation:

Answer: 21.6 mol of Fe

Explanation:

Fe2O3 + 3 CO → 2 Fe + 3 CO2

32.4 mol CO  x  __2 mol Fe__  =  21.6 mol of Fe

                              3 mol CO

Answer:

The concentration of sulfuric acid would be 3.6 M.

Explanation:

Answer:

300N

Explanation:

Mass = 100kg

Acceleration = 3m/s²

Force = mass × acceleration

F = ma

Force = 100 × 3

Force = 300N

The force required to move 100kg of barbell with an acceleration of 3m/s² is 300N

Answer:

c

Explanation:

False, it should read “Global temperatures have not risen in the past, so it is very dangerous that this change is happening.” Hence, option C is correct.

Global warming is defined in this report as an increase in combined surface air and sea surface temperatures averaged over the globe and over a 30-year period.

Though natural cycles and fluctuations have caused the earth's climate to change several times over the last 800,000 years, our current era of global warming is directly attributable to human activity—specifically to our burning of fossil fuels such as coal, oil, gasoline, and natural gas

Hence, option C is correct.

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Explanation:

exothermic reaction is a chemical reaction which involves the liberation of heat to the surroundings while endothermic reaction is a chemical reaction that involves the absorption of heat from the surroundings

Answer:

Exothermic= outside

Endothermic= inside

Explanation:

Answer:

110

Explanation:

Answer:

its caused by the convection of air masses with differences in densities mainly due to their differences in temperatures.

-Hops

Answer:

Atoms

Explanation:

Substances are made up of millions of atoms that make up of molecules, then particles, until a matter is in shape.

Answer:

substances made of atoms or molecules

Explanation:

these atoms and molecules can be combined using chemical bonding or without chemical bonding

Answer:

1.125

Explanation:

pH = -log[H+]

pH = -log(0.075)

pH = 1.125

Answer:

Earth's Core!

Answer:

Its D

Explanation:

Because 1 nitrogen atom is N2 and theres an N2 in all of those

Formulas I, II, and III each contain an equal number of nitrogen atoms.

To determine which formulas contain an equal number of nitrogen atoms, we need to count the number of nitrogen atoms in each formula.

From the count, we can see that formulas I, II, and III each contain an equal number of nitrogen atoms.

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Answer: 65 N

Explanation:

I just did the question

Answer:

The mass of water vapor is 44.46 grams

The volume of water is 30.37 L

Explanation:

Step 1: Data given

Mass of CH3OH =42.5 grams

Molar mass CH3OH = 32.04 g/mol

Volume of O2 = 22.8 L

Pressure = 2.00 atm

Step 2: The balanced equation

2CH3OH + 3O2 → 2CO2 + 4H2O

Step 3: Calculate moles CH3OH

Moles CH3OH = mass CH3OH / molar mass CH3OH

Moles CH3OH = 42.5 grams / 32.04 g/mol

Moles CH3OH = 1.326 moles

Step 4: Calculate moles O2

p*V = n*R*T

⇒with p = the pressure = 2.00 atm

⇒with V = the volume of O2 = 22.8 L

⇒with n = the moles of O2  = TO BE DETERMINED

⇒with R = the gas constant = 0.08206 L*Atm/mol*K

⇒with T = the temperature = 27 °C = 300 K

n = (p*V) / (R*T)

n = (2.00 * 22.8) / (0.08206*300)

n = 1.85 moles

Step 5: Calculate the limiting reactant

For 2 moles CH3OH we need 3 moles O2 to produce 2 moles CO2  and 4 H2O

O2 is the limiting reactant. It will completely be consumed ( 1.85 moles). CH3OH is in excess. There will react 2/3*1.85 = 1.233 moles. There will remain  1.326 - 1.233 = 0.093 moles

Step 6: Calculate moles products

For 2 moles CH3OH we need 3 moles O2 to produce 2 moles CO2  and 4 H2O

For 1.85 moles O2 we'll have 1.233 moles CO2 and 2.467 moles H2O

Step 7: Calculate mass H2O

Mass H2O = moles H2O * molar mass H2O

Mass H2O = 2.467 moles * 18.02 g/mol

Mass H2O = 44.46 grams

Step 8: Calculate volume H2O

p*V = n*R*T

⇒with p = the pressure = 2.00 atm

⇒with V = the volume of H2O = TO BE DETERMINED

⇒with n = the moles of H2O  = 2.467 moles

⇒with R = the gas constant = 0.08206 L*Atm/mol*K

⇒with T = the temperature = 27 °C = 300 K

V = (n*R*T)/p

V = (2.467 * 0.08206 * 300) / 2.00

V = 30.37 L

The mass of water vapor is 44.46 grams

The volume of water is 30.37 L

Answer:

9.28

Explanation:

pOH refers to a measure of hydroxide ions concentration. pOH tells about the alkalinity of a solution. If pOH is less than 7 then aqueous solutions are alkaline, acidic if pOH is greater than 7 and neutral if pOH is equal to 7.

Concentration of the hydroxide ions = 1.9 x 10-5 M

pH = [tex]-log(1.9\times 10^{-5})=4.72[/tex]

pOH = 14 - pH

=14 - 4.72 = 9.28

Mr. James holds a developmental viewpoint. This perspective prioritizes progress, growth, and expansion, often with a focus on economic development and maximizing opportunities for growth and profit.

In Mr. James' case, his decision to build a new gas station in an area already serviced by existing gas stations reflects a desire for development and expansion of his business ventures. He sees the construction of a new gas station as a means to increase accessibility and choice for the community, potentially attracting more customers and generating additional revenue.

From a developmental viewpoint, Mr. James likely perceives the addition of a new gas station as beneficial for the community, offering consumers more options and fostering competition among gas providers. He may believe that competition will lead to better services, lower prices, and improved overall customer satisfaction.

Additionally, Mr. James may view the construction of a new gas station as a way to contribute to the economic growth and development of the area. The establishment of new businesses can create job opportunities, stimulate local economies, and contribute to the overall prosperity of the community.

However, it's important to note that while the developmental viewpoint emphasizes progress and growth, it may not always prioritize environmental or conservation concerns. In Mr. James' case, the decision to build a new gas station may have implications for environmental sustainability, such as increased pollution or depletion of natural resources, which are factors that conservationists may be more inclined to consider.

Overall, Mr. James' decision to build a new gas station reflects a developmental viewpoint focused on growth, expansion, and economic development, with the belief that it will benefit both his business and the community at large.

Final answer:

The positive ion found in aqueous sulfuric acid (H2SO4) is the hydronium ion (H3O+), which forms during the acid's ionization in water.

Explanation:

The positive ion found in H2SO4(aq) is the hydronium ion (H3O+). When sulfuric acid (H2SO4) is dissolved in water, the first ionization results in the formation of hydronium ions (H3O+) and hydrogen sulfate ions (HSO4−). The second ionization of the hydrogen sulfate ion can produce more hydronium ions and sulfate ions (SO42−). Since we are discussing only positive ions, the hydronium ion is the relevant ion in both ionization steps of sulfuric acid in an aqueous solution.

The ammonium ion (NH4+), sulfide ion (S2−), and hydroxide ion (OH−) are not relevant in the context of sulfuric acid in aqueous solution.

In aqueous sulfuric acid, the only positive ion present is the 2. hydronium ion (H₃O⁺).

In the aqueous solution of sulfuric acid, H₂SO₄(aq), the only positive ion that is found is the hydronium ion (H₃O⁺).

When sulfuric acid (H₂SO₄) is dissolved in water, it undergoes ionization:

First ionization: H₂SO₄(aq) + H₂O(l) ⇒ H₃O+(aq) + HSO₄⁻(aq)

Second ionization: HSO₄⁻(aq) + H₂O(l) ⇒ H₃O⁺(aq) + SO₄²⁻(aq)

This ionization process results in the formation of hydronium ions (H₃O⁺), making them the only positive ions in the solution. The correct answer is 2.

Answer:

phosphorus is more reactive than calcium

Explanation:

Answer:

You see things happen much sooner than you hear them.  

Explanation:

Light travels about a million times as fast as sound.

When the ball hits the bat , it will take about a million times longer to hear the crack of the bat than to see it.

What you see is almost instantaneous.

There will be a delay until you hear the sound.

Deforestation leads to increased carbon dioxide levels in the atmosphere by preventing trees from absorbing it and releasing stored carbon dioxide back into the air.

Deforestation significantly impacts carbon dioxide levels in the atmosphere. When trees are cut down, they can no longer remove carbon dioxide from the atmosphere, leading to an increase in carbon dioxide levels. Additionally, burning trees releases stored carbon dioxide back into the atmosphere, further contributing to the greenhouse effect and climate change.

Answer:

properties

Explanation:

the location on the periodic table can indicate periodic trends such as electronegativity, ionization energy and also the proton amount of the element.

Final answer:

The periodic table allows predictions about an element's properties and behavior based on its location. The group number indicates valence electrons and chemical reactivity, and elements in the same group share similar chemical properties. The periodic table also provides insights into atomic radius, ionization energies, electron affinities, and electronegativity.

Explanation:

The periodic table provides valuable information about an element's properties and behavior. The number of valence electrons, which determines an element's reactivity, can be determined by its group number on the periodic table. Elements in the same group often have similar chemical properties. Additionally, the location of an element on the periodic table can provide insights into its atomic radius, ionization energies, electron affinities, and electronegativity.

Answer:

6.09 M

Explanation:

M(HCl) = 1 +35.5 = 36.5 g/mol

85.6 g * 1 mol/36.5 g = 2.3452 mol HCl

Molarity = mol solute/ L solution = 2.3452 mol/0.385 L = 6.09 mol/L =6.09 M

The number of moles of HCl in 85.6 g is 2.35 moles. Then, the molarity of the 385 ml or 0.385 L solution is 6.10 M

The molarity of a solution is the ratio of the number of moles of its solutes to the volume of solution in liters. It is the common term to express the concentration of a solution.

To find the molarity of the solution, we need to first calculate the number of moles of HCl in the solution, using the formula:

moles = mass / molar mass

where mass is the mass of the solute (hydrochloric acid) and molar mass is the molecular weight of the solute.

The molecular weight of HCl is approximately 36.5 g/mol (1.008 g/mol for hydrogen and 35.5 g/mol for chlorine).

So, the number of moles of HCl in 85.6 g of HCl is:

moles = 85.6 g / 36.5 g/mol = 2.35 mol

Next, we need to calculate the volume of the solution in liters:

385 mL = 0.385 L

Finally, we can calculate the molarity of the solution using the formula:

molarity = moles of solute / liters of solution

molarity = 2.35 mol / 0.385 L ≈ 6.10 M

Therefore, the molarity of the solution produced is approximately 6.10 M.

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Answer:

B

Explanation:

Since we want to find the volume of CO, but we're given Nickel's mass, we need to convert grams of Nickel to moles then convert that to moles of CO using stoichiometry from the balanced reaction.

The molar mass of Nickel is 58.69 g/mol:

[tex]18.9 g Ni *\frac{1mol}{58.69gNi} =0.322molNi[/tex]

From the reaction, we can see that each mole of Nickel is 4 moles of CO, so to find the number of moles of CO from 0.322 moles of Nickel, multiply 0.322 by 4: 0.322 * 4 = 1.29 mol CO

Now, we can use the ideal gas law, PV = nRT, to find the volume of CO:

- the pressure P is 2.99 atm

- the volume is what we want to find

- the moles n is 1.29 mol CO

- the gas constant R here would be 0.08206 L atm / (mol K)

- the temperature T is 340.°C + 273 = 613 K

Plug all these values in:

PV = nRT

(2.99 atm) * V = (1.29 mol) * (0.08206) * (613 K)

V ≈ 21.7 L

The answer is B

Answer:

C on plato good luck

Explanation: