Which of the following are fair conductors and are always solid at room temperature?

1.Metals
2.Nonmetals
3.Metalloids
4.Ions

Answer:

(a) SeF₄

(b) OF₂

(c) N₂O

(d) PCl₃

Explanation:

Write the formula for each compound.

(a) selenium tetrafluoride. According to the name, this compound has 1 atom of Se and 4 atoms of F. The resulting formula is SeF₄, in which Se has the oxidation number 4+ and F has the oxidation number 1-.

(b) oxygen difluoride. According to the name, this compound has 1 atom of O and 2 atoms of F. The resulting formula is OF₂, in which the oxidation number of O is 2+ and the oxidation number of F is 1-.

(c) dinitrogen monoxide. According to the name, this compound has 2 atoms of N and 1 atom of O. The resulting formula is N₂O, in which the oxidation number of N is 1+ and the oxidation number of O is 2-.

(d) phosphorus trichloride. According to the name, this compound has 1 atom of P and 3 atoms of Cl. The resulting formula is PCl₃, in which the oxidation number of P is 3+ and the oxidation number of Cl is 1-.

Answer:

Only plant cells

Explanation:

This organelle helps plants photosynthesize. Humans do not do that.

Answer:

polar

Explanation:

because carbon and sulfur have different electronegativities, the S=C bond is polar.

The entire molecule is nonpolar however because the dipoles (polar bonds) cancel out due to the geometry of the molecule (linear)

Answer:

Explanation:

he pH of the water will determine the toxic effects, if any, of these substances.

Pure water is neutral with the pH of 7. But when water combines with other substance the pH varies as per the acidity of the combining substance.

pH is the measure of acidity of a solution and mathematically it is the negative logarithm of hydrogen ion concentration. Acidic substance have a pH of less than 7 whereas, basic substance have higher pH value.

Water when combines with some acids, its acidity increases. For example acid rain resulting from the reaction of rain water with oxides of nitrogen and Sulphur forming nitric acid and sulphuric acid.

pH of water have a role in the toxic effects of components in water pH and alkalinity of water determines the coagulation of other substances in water.

Hence, the properties of other substance in water is pH dependent and might effect the alkalinity or acidity of water as well the properties of substances in water such as toxicity.

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Answer:

This question is incomplete as it lacks options, the options are:

A. chlorine (CI)

B. iodine (1)

C. sulfur (S)

D. hydrogen (H)

The answer is A. Chlorine

Explanation:

Polarity of a substance in chemistry is a function of electric charges in the atoms of the molecules involved. Polarity, however, can be increased or decreased in molecules depending on the charges of the atoms that form them.

Since polarity increases when an atom in the molecule has a high ability to pull electrons toward itself i.e. electronegativity, one atom that can be substituted for Bromine in the hydrogen bromide (HBr) molecule in order to increase its polarity is CHLORINE. This is because Chlorine (Cl) is more electronegative than Bromine atom, hence, will pull more electrons from hydrogen to make the HCl molecule more polar than HBr.

To increase the polarity of HBr, the bromine atom can be replaced with a hydrogen atom.

A polar molecule is one in which a dipole moment exists. There is a positive end and a negative end in a polar molecule. Conventionally, the direction of the dipole is from the positive end of the molecule towards the negative end of the molecule.

If we want to increase the polarity of the molecule then we must substitute the bromine atom with a more electronegative atom. In this case, chlorine is  the best option.

Missing parts;

If you wanted to change the polarity of hydrogen bromide (HBr) by substituting the bromine by a different atom. Which atom would increase the polarity of the  molecule?

A. chlorine (CI)

B. iodine (1)

C. sulfur (S)

D. hydrogen (H)

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Answer:

It would be A.  Air molecules touch the warm ground, Heating them up because conduction is when a source of energy touches something directly.

Answer:

3. Air molecules touch the warm ground, heating them up.

Explanation:

Answer:

the given reaction after balancing is:

4Ag + 2H2S +O2 > 2AG2S +2H2O

Explanation:

4Ag=Ag

2H2=2H2

O2=20

2S=2S

I hope that you will understand that.

Answer:

b

Explanation:

suspension is the heterogenos solution

Answer:

Two Negative Charges

Explanation:

C. Two negative charges

Given condition: An atom gains two electrons during the formation of a bond.

As we know gaining an electron results in a negative charge and here two electrons being gained.

Therefore, the charge on it after gaining two electrons will be two negative charges.

Thus, the correct option is option C.

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Answer:

(D)C 6H 12O 6

Explanation:

Answer:

[tex]C_{6} H_{12} O_{6}[/tex].

Explanation:

To answer this question you will need to learn about the molecular formula and organic elements.  

So, Molecular Formulas tell you how many atoms of each element are in a compound or the actual whole number ratio; Multiple of Empirical*

Organic Elements - The Organic elements are Protein, Carbohydrates, Lipids, and Nucleic Acids. Lets break down each element. Proteins are made of amino acids. Carbohydrates are made of Carbon, oxygen and hydrogen. Lipids include fats and waxes and Nucleic acids are a long chain of components such as RNA and DNA. Also the other elements are nitrogen, oxygen.

*The Empirical Formula - Tells you the simplest of elements in a                     compound or the simplest whole number; ratio of the elements.

Next, Lets look at some examples of Molecular Formulas v.s The Empirical formula. To solve any problem with these 2, you simply simplify the Molecular formula.

Example 1 -

Empirical: [tex]C_{5} H_{11}[/tex]                 Molecular: [tex]C_{10} H_{22}[/tex]

See how you can do that? Simplify the molecular and it turns into an empirical.

Now lets dig in to the possible answers -

[tex]C_{6} H_{12} O_{6}[/tex] - Glucose. Glucose is a carbohydrate or sugar. It is one type of sugar. It is important to us and all living beings because cells in a organism uses it as energy. Remember, Glucose is a Carb and a Carb is one of The Organic Elements! so we can put this on the list of possible answers

[tex]NH_{2}[/tex] - Amino radical. Amino radical (aka the aminyl radical), is the neutral form of the amide ion. This means in terms of Positive and Negative, Amino radical is the neutral version of amide ion. Amide Ion is not a Organic Molecule, so it is not a possible answer.

[tex]CU_{2} O[/tex] - Copper(I) oxide. (aka cuprous oxide) is a chemical compound. It has copper in its +1 oxidation state and contains oxide ions. Copper(1) oxide is a chemical compound so it is not a possible answer.

[tex]H_{2} O[/tex] - Water. [tex]H_{2} O[/tex] is the symbol for water. Each molecule of water has 2 atoms of hydrogen and a single atom of oxygen. While this may seem a possible answer because water is a natural resource, it isn't a organic molecule.

So, the only possible answer is [tex]C_{6} H_{12} O_{6}[/tex].

Hope this helped you! I took a really, really long time on this question, i had the same one in school. Please mark me brainliest and Have a great day!

Answer:

is c a mixture of minerals

Explanation:

Answer:

18.998403

is the mass

Answer:

Manganese (Mn)

Explanation:

We know it's manganese because we are told it is an electrically neutral atom. This means it has the same number of protons and electrons. If it has 25 electrons, it has 25 protons. Protons tell us the atomic number of the atom, which also tells us the name of the element. Manganese is element 25 on the periodic table.

The subscript 2 indicates number of Cl atoms

The molecular formula shows the number of atoms of a compound

whereas the empirical formula is the simplest comparison of the atoms making up the compound

MgCl₂ is an ionic compound composed of Mg and Cl atoms

Mg is in group 2 which has a +2 charge, while Cl is in the Halogen group which has a charge of -1

If the two are bonded, the 2 electrons released by Mg will be bound by 2 Cl atoms, each of which atoms of Cl need 1 more electron in order to obtain a stable electron configuration such as a noble gas

So the number 2 in the MgCl compound indicates the number of Cl atoms

Answer:

a. 0.047 M

b. 0.6778 moles

c. 6.76 g/mol

Explanation:

The formula for osmotic pressure is:

Where:

a.) So we solve for M:

b.) We calculate the moles of solute, using the volume and molar concentration:

c.) We calculate the molar mass, using the mass and the number of moles:

A. The molar concentration of the solution is 0.047 M

B. The mole of the solute in the solution is 0.034 mole

C. The molar mass of the solute is 134.7 g/mol

A. Determination of the molar concentration of the solution.

Osmotic pressure (π) = 875 torr = 875 / 760 = 1.15 atm

Temperature (T) = 25 °C = 25 + 273 = 298 K

Van't Hoff's factor (i) = 1 (non-electrolyte)

Gas constant (R) = 0.0821 atm.L/Kmol

π = iMRT

1.15 = 1 × M × 0.0821 × 298

1.15 = M × 24.4658

Divide both side by 24.4658

M = 1.15 / 24.4658

B. Determination of the mole of the solute.

Molarity = 0.047 M

Volume = 725 mL = 725 / 1000 = 0.725 L

Mole = Molarity x Volume

Mole of solute = 0.047 × 0.725

C. Determination of the molar mass of the solute

Mole of solute = 0.034 mole

Mass of solute = 4.58 g

Molar mass = mass / mole

Molar mass of solute = 4.58 / 0.034

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Answer:

1. Number of moles in 3.63 * 10²² atoms of K = 0.06 moles

2. Number of moles in 5.96 g of BaCO₃ = 0.03 moles

3. Number of moles of NH₃ = 0.88 moles

4. Volume of CSI = 0.50 liters

Explanation:

1. One mole of K contains 6.02 * 10²³ atoms

Number of moles in 3.63 * 10²² atoms = (3.63 * 10²² atoms/6.02 * 10²³ atoms) * 1 mole

Number of moles in 3.63 * 10²² atoms of K = 0.06 moles

2. Number of moles = mass / molar mass

Molar mass of BaCO₃ = 197.33 g/mol; mass of BaCO = 5.96 g

Number of moles = 5.96 g/ 197.33 g/mol

Number of moles in 5.96 g of BaCO₃ = 0.03 moles

3. Number of moles = mass / molar mass

Molar mass of NH₃ = 17 g/mol; mass of NH₃ = 1.50 g

Number of moles = 1.50 g/ 17 g/mol

Number of moles of NH₃ = 0.88 moles

4. Chlorosulfonyl isocyanate, ClSO2NCO, otherwise known as CSI, is a reagent used in organic synthesis. It has a density of 1.626 g/cm³.

Volume = mass/density

mass = 82.0 g; density of CSI = 1.626 g/cm³

Volume = 82.0 g / 1.626 g/cm³

Volume = 50.43 cm³

Volume = 50.43 cm³/1000 cm³ * 1 liter

Volume of CSI = 0.50 liters

Answer:

Because these ions contain more than one atom, they are called polyatomic ions. Polyatomic ions have characteristic formulas, names, and charges that should be memorized. For example, NO3− is the nitrate ion; it has one nitrogen atom and three oxygen atoms and an overall 1− charge.

Polyatomic Ions.

Name     Formula

sulfite ion SO32−

Explanation:

Answer:

I think it is A. the two forces are equal, or balanced, neither the table nor the book moves up or down.

Explanation:

Tome, the other options don’t make no sense

Answer:

15

I hope this helps

Answer:

167in

Explanation:

Given arithmetic;

        56.5in + 95.3in + 15in

To determine the correct significant digits, the sum cannot be more precise than the least precise value in the addition;

 The least precise is 15in and it is in 2significant places;

      56.5in

      95.3in

 +    15    in

......................

      166.8in

......................

The value is 167in

Answer:

Transition metals can have multiple oxidation states because of their electrons. The transition metals have several electrons with similar energies, so one or all of them can be removed, depending the circumstances. This results in different oxidation states.

Answer:

The answers are "partially filled" and "d" on Plato

Explanation:

Answer:

I do not bake but my mom is a professional baker.  

Explanation:

A roof over my head and a warm home.

Plenty of drinkable water.

I don't have to go hungry.

I can enjoy the small and free pleasures of life.

Access to the internet.

My friends and family.

My health.

The kindness of people I have never met before.

Answer:

Speeds up when temperature is increased and can travel through a solid

Explanation:

Answer:  Btu, British Thermal Unit is used to express thermal energy when working in pounds and degrees Farenheit.

Calories are used when working in grams and degrees Centigrade or Kelvin (SI units)

A Joule is the British system unit used to measure heat transfer.

Explanation:

Answer:

A. [H₃O⁺] = 0.900 M

B. pH = 0.0 to one decimal place

C. [H₃O⁺] = 0.620 M

D. pH = 0.21 to two decimal places

Explanation:

A. Equation for the complete dissociation of H₃PO₄ is given below:

H₃PO₄(s) + 3H₂O(l) -----> PO₄³⁻(aq) + 3H₃O⁺(aq)

From the equation of reaction, one mole of H₃PO₄ produces 3 moles of H₃O⁺

Therefore, [H₃O⁺] = 3 * 0.300M = 0.900 M

B. pH = -log[H₃O⁺]

pH = - log(0.900)

pH = -log (9 * 10⁻¹)

pH = 0.0 to one decimal place

C. Equation for the complete dissociation of H₂C₂O₄ is given below:

H₂C₂O₄(s) + 2H₂O(l) ----> C₂O₄⁻(aq) + 2H₃O⁺

From the equation of reaction, one mole of H₂C₂O₄ produces 3 moles of H₃O⁺

Therefore, [H₃O⁺] = 2 * 0.310 M = 0.620 M

D. pH = -log[H₃O⁺]

pH = -log(0.620)

pH = -log(0.62 * 10⁻¹)

pH = 0.21 to two decimal places

The concentration of [[tex]\rm H_3O^+[/tex]] has been 0.9 M, and the pH has been 0.045.

The polyprotic acid has been able to donate more than one proton in an acid-base reaction.

The balanced chemical reaction can be:

[tex]\rm H_3PO_4\;+\;3\;H_2O\;\rightarrow\;PO_4^3^-\;+\;3\;H_3O^+[/tex]

(a) According to the equation, 1 mole of [tex]\rm H_3PO_4[/tex] gives 3 moles of hydronium ions. The molarity has been defined as moles per liter. Assuming the volume of reaction to be 1 liter.

1 mole [tex]\rm H_3PO_4[/tex] = 1 M [tex]\rm H_3PO_4[/tex]

1 mole [tex]\rm H_3PO_4[/tex] = 3 moles [[tex]\rm H_3O^+[/tex]]

0.3 mole [tex]\rm H_3PO_4[/tex] = 3 [tex]\times[/tex] 0.3 moles [[tex]\rm H_3O^+[/tex]].

0.3 mole [tex]\rm H_3PO_4[/tex] = 0.9 moles [[tex]\rm H_3O^+[/tex]]

The concentration of [[tex]\rm H_3O^+[/tex]] has been 0.9 mole/L, or 0.9 M.

(b) pH of the solution can be defined as:

pH = -log [[tex]\rm H_3O^+[/tex]]

pH = -log (0.9)

pH = 0.045

The pH of the solution has been 0.045.

(c) The polyprotic acid have the balanced equation:

[tex]\rm H_2C_2O_4\;+\;2\;H_2O\;\rightarrow\;C_2O_4^-\;+\;2\;H_3O^+[/tex]

According to the equation, 1 M [tex]\rm H_2C_2O_4[/tex] gives 2 M [tex]\rm H_3O^+[/tex].

The concentration of hydronium ions from 0.310 M [tex]\rm H_2C_2O_4[/tex] has been:

1 M [tex]\rm H_2C_2O_4[/tex] = 3 M [tex]\rm H_3O^+[/tex]

0.310 M [tex]\rm H_2C_2O_4[/tex] =  2 [tex]\times[/tex] 0.310 moles [[tex]\rm H_3O^+[/tex]]

0.310 M [tex]\rm H_2C_2O_4[/tex] = 0.62 M  [[tex]\rm H_3O^+[/tex]].

The  [[tex]\rm H_3O^+[/tex]] concentration of the solution has been 0.62 M.

(d) pH of the solution can be defined as:

pH = -log  [[tex]\rm H_3O^+[/tex]]

pH = -log (0.62)

pH = 0.20

The pH of the solution has been 0.20.

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