How many Group 17 elements are in Period 3 of the Periodic Table? A) 1 B) 2 C) 3 D) 4

Answer:

u can g00gle it , just copy nd paste its all there. hope this helps

Explanation:

Answer:

C.44.01 u

Explanation:

basta ayan yong answer ko

Answer:

bldg licking no-good also

Answer:

Water splitting is the chemical reaction in which water is broken down into oxygen and hydrogen: 2 H2O → 2 H2 + O. Efficient and economical water splitting would be a technological breakthrough that could underpin a hydrogen economy, based on green hydrogen.

Answer:

Given nuclide is uranium-234.

If it undergoes beta decay then, what will be the daughter particle?

Explanation:

The beta particle decay increases the atomic number of the nuclide by one.

There is no change in the mass number of the nuclide.

The decay of beta particle from Uranium-234 is shown below:

It forms Np-93.

Answer:

hand picking

Explanation:

as stone is bigger in size we can see them with our eyes so we can handpick it

Answer:

The method of hand picking is used to separate undesirable substances such as small pieces of stones from wheat, rice and pulses. The food grains containing small pieces of stones are taken in a flat container. The pieces of stones are picked up from the grains by hands, one by one, and thrown away.23 Oct 2020

Answer:

Explanation:

Answer:

A. n= C x V

Explanation:

Molarity of a solution is the molar concentration of that solution. It can be calculated using the formula:

M = n/V

Where;

M = molarity (M)

n = number of moles (n)

V = volume (mL)

To calculate the number of moles from a given molarity value and volume, we say:

n = M × V

For this case of NH4Cl;

V = 500mL = 500/1000 = 0.5L

M = 0.300 M

n = 0.300 × 0.5

n = 0.15moles

Answer: n=CxV

Explanation:

Answer:

This question doesnt make much sense but ill try to answer it.

A brushed DC electric motor is an internally commutated electric motor designed to be run from a direct current power source. Brushed motors were the first commercially important application of electricity. If the shaft of a DC motor is turned by an external force, the motor will act as a generator. DC Motor rotation does have to do with the voltage polarity and the direction of the current flow.

Answer:

Hydrochloric acid + calcium hydroxide = calcium chloride + water

Explanation:

10 moles h20 is required

10 moles of H₂ are required to make 10 moles of H₂O.

Stoichiometry is an important concept which helps us use the balanced chemical equation to measures the amount of reactants and products.

A balanced chemical equation is chemical equation that has equal number of atoms on both sides of arrow that is reactant and product.

First we have to write the Balanced chemical equation

2H₂ + O₂ → 2H₂O

To produce 2 moles of water, 2 moles of hydrogen are required to produce 10 moles of water.

So,

[tex]\frac{2\ \text{moles of}\ H_2}{2\ \text{moles of}\ H_2O}[/tex] × 10 moles of H₂O

= 10 moles of hydrogen are required.

Thus, from above conclusion we can say that 10 moles of H₂ are required to make 10 moles of H₂O.

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Answer:

The nitration of phenol is easier than that of benzene because benzene has delocalised pie-electrons which makes it more stable than phenol.

Phenol is converted to Trinitrotoluene by adding zinc dust to remove the hydroxyl group, then reacted with Aluminium oxide followed by haloalkane.

Answer: The given compounds are identified as being made of ionic, covalent, or metallic bonds:

Explanation:

A bond formed by transfer of electrons from one atom to another is called an ionic bond. An ionic bond is formed between a metal atom and a non-metal atom.

A bond formed by transfer of electrons from one atom to another is called a covalent bond. A covalent bond is formed between two or more non-metal atoms only.

Steel is actually an alloy of carbon and iron where there is less than 2% carbon, 1% manganese and small amounts of silicon, phosphorus, oxygen and sulphur are present.

When atoms of metals are held together then bond formed between these atoms is called metallic bond.

Hence, steel is made of metallic bond.

Chemical formula of propane is [tex]CH_{3}CH_{2}CH_{3}[/tex] as there are only non-metal atoms are present. So, sharing of electrons takes place in such atoms due to which covalent bonding will be there.

Hence, propane is made up of covalent bonds.  

Calcium chloride contains a metal and a non-metal atom. This means that electrons are being transferred from calcium atom to the chlorine atom. Hence, bond present in calcium chloride is ionic bond.

Water has chemical formula [tex]H_{2}O[/tex]. Since, non-metal atoms are present there so sharing of electrons takes place between hydrogen and oxygen atoms. Hence, covalent bond is present in water.

Thus, we can conclude that given compounds are identified as being made of ionic, covalent, or metallic bonds:

Steel: ✔ metallic

Propane: ✔ covalent

Calcium chloride: ✔ ionic

Water: ✔ covalent

Answer:

5.42x10^24 atoms/1 x 1 mole/6.022x10^23

= 9.5 mol

Answer:

the tree red

Explanation:

Copper (II) substances burn to produce bluish-green flames.

The copper (II) present in the wood will make the flame produce a bluish-green color.

This is because copper (II) compounds are known to produce flame colors that range from blue to bluish-green when tested in the laboratory.

This is because the electrons in the atoms of copper lose energy and drop to lower energy, releasing the lost energy as light in the process.

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Ocean acidification is the process of decreased pH levels of the oceans. The burning of fossil fuels and industrialization are man-made activities that lead to this process.

Ocean acidification is an increased concentration of acidic components of the oceans due to an increase in the carbon dioxide level of the oceans.

Human activities like cutting down a large number of trees, discharging from industrial outlets, and burning fossils like petrol, coal, diesel, etc. are leading to increased acidification of the oceans.

Therefore, natural causes like increased salinity, flood, and earthquake are the reasons for oceanic acidification.

Learn more about ocean acidification here:

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Answer:

cu+2 ------ oxidation whereas Cu ------ reduction.

Explanation:

In the reaction, cu+2 is the place where oxidation occurs because this cupric ion losses electrons  which causes +2 charge on it. we know that oxidation is the loss of electrons and reduction is the gaining of electrons so the Cu is the place or atom at which reduction occurs. Electrochemical cells have two electrodes, which is anode and the cathode. The anode is the electrode where oxidation occurs whereas the cathode is the electrode where reduction takes place.

from

HCl + NaOH----> NaCl +H2O

n of acid=1

n of base=1

Molarity of acid=750M

Molarity of base=290M

volume of base=25ml

from

Va=Mb ×vb×na

Ma×nb

Va=290×25×1

750×1

Va=7250

750

Va=9.67ml

The volume of .750 M hydrochloride acid is required to react completely with 25.00 mL of .290 M NaOH solution is 9.67ml

HCl + NaOH----> NaCl +H2O

n of acid=1

n of base=1

Molarity of acid=750M

Molarity of base=290M

volume of base=25ml

Therefore,

Va=Mb ×vb×na

Ma×nb

Va=290×25×1

750×1

Va=7250

750

Hence,

Va=9.67ml

Hydrochloric acid, also known as muriatic acid, is an aqueous solution of hydrogen chloride. It is a colorless solution with a distinctively pungent smell. It is classified as a strong acid. It is a component of the gastric acid in the digestive systems of most animal species, including humans. Hydrochloric acid is an important laboratory reagent and industrial chemical.

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Answer:

STP is 101.325 kPa pressure and 273K temperature

Also, at STP, 1 mol of an ideal gas = 22.4 L

Since the question states that 22.4 L are needed at STP, we know that ONE MOLE is needed.  Now, the question is, how many moles are actually present?

V = 25.0 L

P = 101.5 kPa

T = 373K

n = ?

R = 8.31 L-kPa/Kmol

Solving the ideal gas law for n (moles) and comparing that to 1 mole, we have...

n = PV/RT = (101.5)(25.0)/(8.31)(373)

n = 0.82 moles of gas.  THIS IS NOT ENOUGH as it is less than the ONE mole required.

Explanation:

Answer:

pH = 6

Explanation:

Given that,

The concentration of [OH]⁻ ion is [tex]10^{-6}[/tex].

We need to find the pH of the solution.

We know that,

[tex]pH=-\log[OH]^-[/tex]

Put all the values,

[tex]pH=-\log(10^{-6})\\\\pH=6[/tex]

Hence, the pH of the solution is 6.

Answer: A volume of 10.66 mL of 1.5 M H is required to exactly neutralize 20. milliliters of a 0.8 M KOH solution.

Explanation:

Given: [tex]M_{1}[/tex] = 1.5 M,     [tex]V_{1}[/tex] = ?

[tex]V_{2}[/tex] = 20 mL,         [tex]M_{2}[/tex] = 0.8 M

Formula used to calculate the volume is as follows.

[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]

Substitute the values into above formula as follows.

[tex]M_{1}V_{1} = M_{2}V_{2}\\1.5 M \times V_{1} = 0.8 M \times 20 mL\\V_{1} = 10.66 mL[/tex]

Thus, we can conclude that a volume of 10.66 mL of 1.5 M H is required to exactly neutralize 20. milliliters of a 0.8 M KOH solution.

Answer:

dissolving

Explanation:

Answer:

dissoliving

Explanation:

salt and sugar are both soluble

Answer: The concentration of a solution made by combining 52 grams of  [tex]NaCH_{3}COO^{-}[/tex] with 150 mL of water is 4.22 M.

Explanation:

Given: Mass = 52 grams

Volume = 150 mL (1 mL = 0.001 L) = 0.150 L

Molarity is the number of moles of a substance present in liter of a solution.

And, moles is the mass of a substance divided by its molar mass.

Hence, moles of [tex]NaCH_{3}COO^{-}[/tex] (molar mass = 82.034 g/mol) is as follows.

[tex]Moles = \frac{mass}{molar mass}\\= \frac{52 g}{82.034 g/mol}\\= 0.633 mol[/tex]

Therefore, concentration of given solution is as follows.

[tex]Molarity = \frac{moles}{Volume(in L)}\\= \frac{0.633 mol}{0.150 L}\\= 4.22 M[/tex]

Thus, we can conclude that the concentration of a solution made by combining 52 grams of  [tex]NaCH_{3}COO^{-}[/tex] with 150 mL of water is 4.22 M.

For this one u can work out the amount of moles in h2co3 by using moles=mass/mr(of h2co3 is 52)

so 16/62=0.258moles then u use the equation

number of particle = moles × 6.02×10^23

=0.258×6.02 ×10^23

=1.55×10^23 molecules.

hope this helps