which of the following options correctly describe the steps required to determine the shape of a molecule? multiple select question. both bonding and nonbonding electron pairs must be considered. the lewis structure of the molecule must be drawn first. the shape of the molecule is dictated by the most stable arrangement of the outer electron pairs. only electrons that form bonds need to be considered. the most stable arrangement is the one that has the outer electron pairs as close together as possible.

In acetylene, each carbon atom shares one pair of electrons with one hydrogen atom and three pairs of electrons with the other carbon atom.

A carbon atom has four electrons in its outermost shell and needs four electrons to be stable. In acetylene, two carbon atoms are covalently bonded with three electron pairs and the remaining one electron pair is covalently bonded with two hydrogen atoms.

Thus, both carbon and hydrogen atoms gain stability, so in acetylene each carbon atom shares one pair of electrons with a hydrogen atom and shares three pairs of electrons with another carbon atom.

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Barred spiral galaxies have a bright linear feature called a bar that straddles the nucleus, with the arms unwinding from the ends of the bar.

This is one key difference from regular spiral galaxies that can describe a barred spiral galaxy efficiently.

The sign of ΔH (change in enthalpy) can be used to determine whether a reaction is exothermic or endothermic.

If ΔH is negative (ΔH < 0), it indicates that the reaction is exothermic. In an exothermic reaction, the system releases heat to the surroundings. The reactants have a higher enthalpy than the products, resulting in a decrease in enthalpy during the reaction. The negative value of ΔH represents the energy being released.

On the other hand, if ΔH is positive (ΔH > 0), it signifies that the reaction is endothermic. In an endothermic reaction, the system absorbs heat from the surroundings. The reactants have a lower enthalpy than the products, resulting in an increase in enthalpy during the reaction. The positive value of ΔH represents the energy being absorbed.

Therefore, by considering the sign of ΔH, whether it is negative (exothermic) or positive (endothermic), one can determine the direction of heat flow and classify the reaction accordingly based on the energy changes involved.

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The element group VI A, also known as the chalcogen group, consists of the elements oxygen, sulfur, selenium, tellurium, and polonium. These elements are characterized by having six valence electrons, which is why they are placed in group VI A of the periodic table.

The period number refers to the row of elements on the periodic table. Elements in period 3 include sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, and argon.

It is not possible to determine the number of protons in the nucleus of an element based on its group and period alone. The number of protons in the nucleus of an element is equal to its atomic number, which is a unique property of each element.

Oxygen, which is the first element in group VI A, has an atomic number of 8, which means it has 8 protons in its nucleus. Sulfur, which is the second element in group VI A, has an atomic number of 16, which means it has 16 protons in its nucleus. Selenium, which is the third element in group VI A, has an atomic number of 34, which means it has 34 protons in its nucleus. Tellurium, which is the fourth element in group VI A, has an atomic number of 52, which means it has 52 protons in its nucleus. Polonium, which is the fifth element in group VI A, has an atomic number of 84, which means it has 84 protons in its nucleus.

Elements in period 3 with atomic numbers 11, 12, 13, 14, 15, 16, 17, and 18 are sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, and argon, respectively. These elements have 11, 12, 13, 14, 15, 16, 17, and 18 protons in their nuclei, respectively.

You would need 5 ml of hydrogen gas to produce 5 ml of water vapor when an unlimited volume of oxygen gas is available.

To determine the volume of hydrogen needed to produce 5 ml of water vapor, we can use the balanced chemical equation for the reaction between hydrogen gas (H2) and oxygen gas (O2): 2H2 + O2 → 2H2O.
Since the stoichiometry of the reaction indicates that 2 moles of hydrogen gas react with 1 mole of oxygen gas to produce 2 moles of water vapor, we can use the mole ratio to calculate the volume of hydrogen gas needed.
First, convert the given volume of water vapor (5 ml) to moles by dividing by the molar volume of water vapor (22.4 L/mol) at standard temperature and pressure. This gives us:
5 ml ÷ 1000 ml/L ÷ 22.4 L/mol = 0.000223 moles of water vapor.

Since the mole ratio is 2:2 between hydrogen gas and water vapor, we need the same amount of moles of hydrogen gas. Therefore, the volume of hydrogen gas needed can be calculated using the molar volume of hydrogen gas (22.4 L/mol) at standard temperature and pressure:
0.000223 moles × 22.4 L/mol = 0.005 L or 5 ml of hydrogen gas.
Thus, you would need 5 ml of hydrogen gas to produce 5 ml of water vapor when an unlimited volume of oxygen gas is available.

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Answer:

According to the numbers 1-5;Aluminium,Mercury,Oxygen,Stainless Steel,Hydrogen gas.

Explanation:

Answer:

magnitude means absolute value, so the one that is greastest, like |-7| and |4| even id |-7| is a negative number, but it is still the one farthest away from 0, so |-7| is greater than |4|.

That is the way to find the greatest magnitude, but because I don't know your numbers so I can not answer your question, but this is the way to solve for it.

HOPE THIS HELPS!!!!!!!!!( IF IT DOES PLEASE MARK ME AS BRAINLIEST )

Answer:

HF(aq)+NaOH(aq)→NaF(aq)+H2O(l)

Explanation:

Complete question

Dissolved hydrofluoric acid reacts with dissolved sodium hydroxide to form water and aqueous sodium fluoride. What is the net ionic equation

Equilibrium equation between the undissociated acid and the dissociated ions

HF(aq)⇌H+(aq)+F−(aq)

Sodium hydroxide will dissociate aqueous solution to produce sodium cations, Na+, and hydroxide anions, OH−

NaOH(aq)→Na+(aq)+OH−(aq)

Hydroxide anions and the hydrogen cations will neutralize each other to produce water.

H+(aq)+OH−(aq)→H2O(l)

On combining both the equation, we get –  

HF(aq)+Na+(aq)+OH−(aq)→Na+(aq)+F−(aq)+H2O(l)

The Final equation is  

HF(aq)+NaOH(aq)→NaF(aq)+H2O(l)

Answer:

h^‰⅞⁸ cisin cg is and O-H

Answer:

m = 16.67 g of Hg

Explanation:

Let's write the overall decomposition reaction that is taking place:

2HgO ---------> 2Hg + O₂

According to the balanced reaction, we can see that the mole ratio between HgO and Hg is the same (2:2 or 1:1), therefore, we can assume that the moles reactants of HgO would be the moles produced of Hg. So, in order to get the grams of mercury, we need to determine the moles first.

To get the moles, we need to use the following expression:

moles = mass / MM   (1)

The molar mass of HgO can be calculated using the atomic weights, which are:

Hg: 200.59 g/mol ; O: 15.999 g/mol

MM HgO = 200.59 + 15.999 = 216.589 g/mol

The moles are:

moles HgO = 18 / 216.589 = 0.0831 moles

As we stated before, moles reactants are the same moles produced, so:

moles HgO = moles Hg = 0.0831 moles of Hg.

Finally, to get the mass, we just solve the mass from (1):

m = moles * MM   (2)

m = 0.0831 * 200.59

Hope this helps

The balanced equation for the reaction between hydrogen and oxygen to form water is:

2H2 + O2 -> 2H2O

To react 4 moles of hydrogen with 3 moles of oxygen, we will also need 1.5 moles of oxygen.

Since we have enough hydrogen and not enough oxygen to react completely, we can calculate the theoretical yield of water produced.

4 moles of H2 will react to produce 2 moles of H2O and 1.5 moles of O2 will react to produce 0.75 moles of H2O. Therefore, the total theoretical amount of water produced is 2 + 0.75 = 2.75 moles of water.

percent yield = (actual yield / theoretical yield) x 100

percent yield = (3 / 2.75) x 100 = 109.09%.

So the percent yield is 109.09%. This means that 109.09% of the theoretical yield was actually produced, and the reaction was more efficient than expected.

It's worth noting that percent yield can't be more than 100% because it implies that more than the theoretical amount of product was produced, which is not possible. In this case, the percent yield is not a realistic value, therefore, the actual yield and the theoretical yield should be rechecked.

Ammonium hydroxide is a weak base because c. it dissociates only slightly in water.

When dissolved in water, ammonium hydroxide donates a proton to form the ammonium ion and hydroxide ion. However, this reaction is only partially reversible because the ammonium ion is not a strong enough acid to accept a proton and regenerate the ammonium hydroxide. Therefore, the hydroxide ion concentration in the solution is relatively low, making it a weak base. In chemistry, a substance is referred to as a base if it has the ability to accept protons (H+ ions).

Ammonium hydroxide is a weak base because, when dissolved in water, it donates a proton to form the ammonium ion (NH4+) and hydroxide ion (OH−). This reaction is reversible, as represented by the chemical equation below: NH4+ (aq) + OH− (aq) ⇌ NH3 (aq) + H2O (l)However, this reaction is only partially reversible because the ammonium ion is not a strong enough acid to accept a proton and regenerate the ammonium hydroxide. Therefore, the hydroxide ion concentration in the solution is relatively low, making it a weak base.

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Answer:

c. The solubility of lithium chloride will increase

if we dissolve 20.1 g of nickel(ii) iodide in a volumetric flask and add water to a total volume of 125 . ml, then the molarity of the solution is 160.8M.

Molarity is a term which is defined as the ratio of mass of solute to the given volume of solution in litre.

The substance which is present in smaal quantity is termed as solute.

The overall solute and solvent combine to form solution.

Mathematically, Molarity can be written as

Molarity = mass of solute/ volume of solution in litre.

Given,

Mass of Nickel iodide = 20.1 g

Volume of solution = 125 ml

By substituting all the values, we get

20.1 × 1000 / 125

= 160.8 M

Thus, we concluded that if we dissolve 20.1 g of nickel(ii) iodide in a volumetric flask and add water to a total volume of 125 . ml, then the molarity of the solution is 160.8M.

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Answer:

H2SO4 + 2(NaOH) -----> Na2SO4 + 2(H2O).

Explanation:

Answer: atomic nucleus

Explanation:

Answer:

YEESSS

Explanation:

Because that seems like the only logical answer.

Answer:

YES

Explanation:

YES

From the titration above, we can answer that:

A. The volume of 0.20 M NaOH required to reach the equivalence point can be calculated using the equation:

moles of acetic acid = volume of acetic acid (L) * concentration of acetic acid (M)

moles of NaOH = moles of acetic acid (at equivalence point)

From the equation, we know that the stoichiometry is 1:1, so the moles of NaOH are equal to the moles of acetic acid. Therefore, the volume of 0.20 M NaOH required is:

volume of NaOH (L) = moles of acetic acid / concentration of NaOH (M)

volume of NaOH (L) = (50.0 mL * 0.100 M) / 0.200 M

volume of NaOH (L) = 25.0 mL

B. At the equivalence point, the moles of acetic acid and NaOH are equal. The concentration of acetic acid at the equivalence point can be calculated as:

concentration of acetic acid (M) = moles of acetic acid / total volume (L)

concentration of acetic acid (M) = (50.0 mL * 0.100 M) / (50.0 mL + 25.0 mL)

concentration of acetic acid (M) = 0.0667 M

The pH at the equivalence point is equal to the pKa of acetic acid, which is approximately 4.76.

C. After adding 2.00 mL of NaOH past the equivalence point, the exact pH cannot be determined without additional information such as the concentration of acetic acid and its pKa value.

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Answer:

Frog, shark, snake, Lion, tortoise, salamander, ostrich

Answer:

The person above me is correct it is frog, shark, snake, Lion, tortoise, salamander, ostrich

Explanation:

We first verify that the equation is balanced. We have 5 carbons (C), 2 sulfurs (S), and 4 oxygens (O) on each side of the reaction. So the reaction is balanced.

a) Now if we look at the reaction we can see that when 2 moles of SO2 react, 1 mole of CS2 is produced. That is, the ratio is 2 to 1. For each mole of SO2 half as many moles of CS2 will be produced.

So if we have 9.5 moles of SO2 we will have 9.5/2 moles, that is 4.75 moles of CS2.

Answer a) By reacting 9.50 moles of SO2 with an excess of it would be produced 4.75 moles of CS2.

Now, for the following parts of the question, we can apply the ideal gas law. This is because the reaction is in the gas phase and the law applies only to gases.

Where,

P= Pressure at STP = 1 atm

T= Temperature at STP = 273.15K

R= Ideal law constant = 0.08206 (atm L)/(mol K)

V= Volume of the gas

n= Numer of moles

b)We clear n and we replace the known values of SO2 to find the number of moles of SO2 that react.

Now, for each mole of SO2 that reacts we need 5/2 moles of C, that is 0.24x5/2=0.61 moles of C.

We use mass molar of C to calculate the grams.

Mass molar of C=12.01g/mol

Mass of C= Moles of C x Mass Molar

Mass of C= 0.61 mol x 12.01 g/mol = 7.37 g

So, To fully react 5.5 L of SO2 at STP we will need 7.37 g of C.

c)We apply the gas law again but this time we clear the volume.

We also take into account that for each mole of C, 4 moles of CO are produced, so if we have 20 moles of C we will produce 20x4=80 moles of CO.

So, from 20.0 moles of C at STP can be produced 1793.18 liters of CO

Answer:

Ozone or, also known as O^3 is commonly formed by oxygen's interaction with lightning, and is what make the air smell so fresh after it rains. Hope this helps on your gradpoint Earth Atmosphere Posttest!

Explanation:

The formation of solid magnesium chloride (MgCl₂) by the reaction between chlorine gas (Cl₂) and magnesium metal (Mg) at high temperatures is classified as a synthesis reaction or a combination reaction.

Synthesis reactions involve the combination of two or more substances to form a single product. In this case, chlorine gas and magnesium metal combine to produce magnesium chloride as the sole product.

The balanced chemical equation for this synthesis reaction is:

Mg + Cl₂ ⇒ MgCl₂

Hence, the reaction between chlorine gas and magnesium metal to form solid magnesium chloride indicates a synthesis reaction, as the elements combine to form a compound.

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Answer:

Refer to explanation

Explanation:

Weather is the main cause behind most short term environmental changes

For example, a period of heavy rain may lead to a pond overflowing, and flooding the nearby shrubbery

Animals in the area would adapt to this by trying to keep away from the flooded area until it dries out, once the rain ends

The mole ratio of H₂ produced to Mg reacted is 1:1, while the charge on the Mg ion after reacting with HCl is +2.

When Mg reacts with HCl, it forms MgCl₂ and H₂, as shown in the chemical equation: Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g). The mole ratio between H₂ produced to Mg reacted is 1:1. This indicates that one mole of H2 will be produced when one mole of Mg reacts with HCl. Thus, the ratio of H₂ produced to Mg reacted is 1:1. On the other hand, the charge on the Mg ion after reacting with HCl is +2.

This occurs because when the Mg atom loses two electrons, it becomes positively charged with a charge of +2. Therefore, we can conclude that the mole ratio of H₂ produced to Mg reacted is 1:1, while the charge on the Mg ion after reacting with HCl is +2.

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The standard potential of the galvanic cell where X is the anode and Y is the cathode is 1.99 V.

The standard potential of a galvanic cell can be calculated by subtracting the reduction potential of the anode (X) from the reduction potential of the cathode (Y).

E°cell = E°cathode - E°anode

In this case, Y has a higher reduction potential than X, so Y will be the cathode and X will be the anode.

E°cell = E°Y - E°X

E°cell = (-0.44 V) - (-2.43 V)

E°cell = 1.99 V

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Answer:

I don't know yr language

Answer:

1) 1.6 moles of HCl

Explanation:

1) 1.6 moles of HCl

2) 7.0 moles of HCl

3) 2.4 moles of hydrogen

4) 0.96 moles of HCl

Explanation:

The balanced chemical equation is:

According to stoichiometry :

1 mole of  require = 2 moles of  

0.8 moles of  will require=  of  

3.5 moles of  will require=  of  

According to stoichiometry :

2 moles of  produce = 1 mole of  

4.8 moles of  will require=  of  

According to stoichiometry :

1 mole of  are produced by = 2 moles of  

0.48 moles of  are produced by =  of

A)If 0.863 mole of \(NH_3\) are produced, 0.4315 moles of \(N_2\) must have reacted and B) If 0.863 mol \(NH_3\) are produced, 1.2945 mole of \(H_2\) must have reacted.

A) To determine the moles of \(N_2\) that reacted, we can use the stoichiometric coefficients from the balanced chemical equation: \(N_2 (g) + 3 H_2 (g) --> 2 NH_3 (g)\)
According to the balanced equation, 1 mol of \(N_2\) reacts to produce 2 mol of  \(NH_3\). To find the moles of \(N_2\) that reacted to produce 0.863 mol \(NH_3\), we can set up a proportion:
(1 mol \(N_2\) / 2 mol  \(NH_3\)) = (x mol \(N_2\) / 0.863 mol \(NH_3\))
Solving for x:
x mol \(N_2\) = (1 mol \(N_2\) / 2 mol  \(NH_3\)) * 0.863 mol  \(NH_3\)
x mol \(N_2\) = 0.4315 mol \(N_2\)
So, 0.4315 mol \(N_2\) must have reacted.
B) Now, to determine the moles of \(H_2\) that reacted, we can use the stoichiometric coefficients again:
According to the balanced equation, 3 mol of \(H_2\) reacts to produce 2 mol of  \(NH_3\). To find the moles of \(H_2\) that reacted to produce 0.863 mol  \(NH_3\), we can set up another proportion:
(3 mol \(H_2\) / 2 mol  \(NH_3\)) = (y mol \(H_2\) / 0.863 mol  \(NH_3\))
Solving for y:
y mol \(H_2\) = (3 mol \(H_2\) / 2 mol  \(NH_3\)) * 0.863 mol  \(NH_3\)
y mol \(H_2\) = 1.2945 mol \(H_2\)
So, 1.2945 mol \(H_2\) must have reacted.

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