How many neutrons does Fluorine have

Answer:

Water molecules forming hydrogen bonds with one another. The partial negative charge on the O of one molecule can form a hydrogen bond with the partial positive charge on the hydrogens of other molecules. Water molecules are also attracted to other polar molecules and to ions.

Explanation:

Answer:

C. Al2O3

Explanation:

The empirical formula is an expression that represents the simplest proportion in which the atoms that form a chemical compound are present. It is therefore the simplest representation of a compound.

For options A, B and D the empirical formulas are as follows:

A. CH2

B. BH3

D. CH

Answer:

The cation is written first in the name; the anion is written second in the name. Rule 2. When the formula unit contains two or more of the same polyatomic ion, that ion is written in parentheses with the subscript written outside the parentheses.

When writing the formula of a compound that contains polyatomic ion, the metal is written first followed by the central atom in the ion and then other atoms that surround the central atom.

A poly atomic ion refers to an ion that comprises of more than one atom. Such ions are common in chemistry. Examples of polyatomic ions include; PO4^3-, BH4^- etc.

When writing the formula of a compound that contains a polyatomic ion, the metal is written first then the central atom in the ion follows before other atoms that surround the central atom in the ion.

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Answer:

Read below

Explanation:

Do a quick conversion: 1 mole CO2 = 44.0095 gram using the molecular weight calculator and the molar mass of CO2. Check the chart for more details.

Malonate is a competitive inhibitor of succinate dehydrogenase. If malonate is added to a mitochondrial preparation that is oxidizing pyruvate as a substrate,  compound expect to decrease in concentration  is Fumarate.

Succinate dehydrogenase succinate to fumarate. fumarate is the membrane of  tricarboxylic acid cycle enzyme.  this enzyme involved in both tricarboxylic acid cyclic and oxidative phosphorylation. succinate dehydrogenase is the component of the electron transfer chain. transfer of electron from succinate to ubiquinone.

Thus, Malonate is a competitive inhibitor of succinate dehydrogenase. If malonate is added to a mitochondrial preparation that is oxidizing pyruvate as a substrate,  compound expect to decrease in concentration  is Fumarate.

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When 105.2 g of chromium oxide and 60.6 g of aluminum react until one of the reactants is used up, approximately 35.88 g of chromium metal will be produced. we need to first write and balance the chemical equation for the reaction.

From the balanced equation, we can see that for every 2 moles of aluminum, 2 moles of chromium are produced. Therefore, the mole ratio of aluminum to chromium is 2:2 or 1:1. To find the limiting reactant, we need to compare the number of moles of each reactant.

To determine the amount of chromium metal produced, we use the mole ratio from the balanced equation. Since the mole ratio of aluminum to chromium is 1:1, the number of moles of chromium produced will be equal to the number of moles of aluminum used.

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The mass of the precipitate is 8.74 g and the concentration of the calcium nitrate is 0.061 M.

The reaction is given by; 2AgNO3(aq) + CaCl2 (aq) ------>2AgCl(s) + Ca(NO3)2(aq)

Number of moles of AgNO3 = 195/1000 * 0.500 = 0.0975 moles

Number of moles of CaCl2 = 305/1000 * 0.100 = 0.0305 moles

If 2 moles of AgNO3 reacts with 1 mole of  CaCl2

0.0975 moles reacts with  0.0975 moles * 1 mole / 2 moles = 0.04875 moles

Thus CaCl2 is the limiting reactant.

1 mole of CaCl2 produces 2moles of AgCl

0.0305 moles produces 0.0305 moles * 2 moles/ 1mole

= 0.061 moles

Mass of precipitate =  0.061 moles * 143.32 g/mol

= 8.74 g

Now 1 mole of CaCl2  produces 1 mole of Ca(NO3)2

Total volume of solution = 195 ml + 305 ml = 500 ml or 0.5 L

Concentration of Ca(NO3)2 = 0.0305 moles/ 0.5 L

= 0.061 M

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Silk and wool are more easily dyed with azo dyes than other fabrics like nylon or cotton because they are polypeptides.

Polypeptides or polymers made of amino acids are what makeup wool and silk. Natural protein fibers like wool and silk, synthetic polyamide fibers like nylon, and, to a lesser extent, acrylic fibers and blends of these fibers, are typically dyed with acid dyes. They are applied to these fibers from a dyebath under acidic or neutral conditions, thus their name. The azo group is the most widely used chromophore in acid dyes. When an ionic bond is formed between the protonated amine group of the fiber and the acid group of the dye, acid dyes that are anionic and soluble in water are applied to wool, silk, and nylon

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The arrangement of element in the modern periodic table is based on metalic and non metallic element

Answer:

The arrangement of element in the modern periodic table is based on

The pK value for the amino group of serine is approximately 9.5, the pK value for the carboxyl group of serine is approximately 2.2, and the isoelectric point (pI) of serine is approximately 5.85.

The fully protonated form of serine with a +1 charge is NH3+-CH(COOH)(OH)-.

The pKa value for the amino group (-NH3+) of serine is approximately 9.5.

The pKa value for the carboxyl group (-COOH) of serine is approximately 2.2.

To calculate the isoelectric point (pI) of serine, we need to find the pH at which the molecule has a net charge of zero. At this pH, the number of positive charges (from the NH3+ group) will be equal to the number of negative charges (from the -COO- group).

We can estimate the pI by averaging the pKa values of the two ionizable groups:

pI = (pKa of -NH3+ group + pKa of -COOH group) / 2

pI = (9.5 + 2.2) / 2

pI = 5.85

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Answer:

B. Cu + 4HNO3 → Cu(NO3)2 + 2H2O

Explanation:

A redox reaction is one in which oxidation and reduction reactions are occuring simultaneously.

In a redox reaction, an oxidizing agent is reduced ( its oxidation state decreases) whereas a reducing agent is oxidized (it's oxidation state increases).

The nitrogen in the nitrate (v) ion, NO3-, exists in the +5 oxidation state. Therefore it would be acting as an oxidizing agent in any reaction in which it's oxidation state becomes less than +5 after the reaction.

Let us then consider each of the reactions:

A. Reaction 1: in this reaction, the oxidation state of nitrogen remains +5 as what is simply an exchange of radicals in a neutralization reaction.

B. Reaction 2: in this reaction, trioxocarbonate (v) acid oxidizes Copper atom to Copper (ii) ion, while itself it is reduced to Nitrogen (IV) oxide. The oxidation state of nitrogen changes from +5 to +4

C. Reaction 3: in this reaction, what occurs is an exchange of radicals by a displacement reaction. The oxidation state of nitrogen remains the same

D. Reaction 4: in the reaction, what occurs is a neutralization reaction, and the oxidation state of nitrogen remains the same.

Therefore, the correct option is B.

Answer:

There are 140.9 grams in 2.393*10²⁴ aotms of Cl.

Explanation:

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without an explicit dimension or unit of expression. Avogadro's number applies to any substance.

Then you can apply the following rule of three: if 6.023*10²³ atoms are contained in 1 mole of the compound, 2.393*10²⁴ atoms are contained in how many moles?

\(amount of moles=\frac{2.393*10^{24} *1 mole}{6.023*10^{23} }\)

amount of moles= 3.973

If the molar mass of Cl is 35.453 \(\frac{g}{mole}\), then the amount of mass that contains 3.973 moles can be calculated as:

3.973 moles*35.453 \(\frac{g}{mole}\)= 140.85 grams ≅ 140.9 grams

There are 140.9 grams in 2.393*10²⁴ aotms of Cl.

Answer:

c. an atom

Explanation:

Answer:

C

Explanation:

Answer:

oxygen friend

Explanation:

It is generally believed that the Earth's atmosphere did not contain oxygen until around 2500 million years ago (Mya) when oxygen-evolving photosynthetic bacteria arose. At around 800–500 Mya, the oxygen concentration increased sharply to reach the 21% we have today. So, it seems highly likely that life arose as anaerobic organisms, which then evolved to tolerate oxygen and finally, to use it as a terminal acceptor for the energy-producing oxidative processes in the respiration of aerobic bacteria and mitochondria in eukaryotic cells. The respiratory processes employed by typical aerobic organisms today have a wide range of mechanisms to deal with the troublesome side effects of living with a high oxygen concentration.

Answer:

jupiter,uranus ,neptune

Explanation:

They have all are planetary rings in the solar system

Neptune, Uranus, Jupiter have rings on them.

The Solar system is made up of 9 planets in order starting nearest the sun as  Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto

Of these planets , there are four that have rings which includes:

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Answer:

C

Explanation:

Answer:

●3 refer to No. of molecule

There are 3 molecule of NH4

●4 refer to atom of hydrogen

since there are 3 molecules of NH4.Each molecule containing 4 H.Therefore there are 12 H atom in the compound

Answer: They are the same species and have the same traits.

Explanation: These horses are well, the same species because they are horses.  They have very similar traits.  

Let me know if this is right!

The entropy change for the irreversible process of the ideal gas is 3.057 J/K.

The entropy change (ΔS) for an irreversible process can be calculated using the equation:

ΔS = q/T

where q is the heat absorbed or released by the system and T is the temperature in Kelvin.

In this case, q = 911 J (since it is given as a positive value) and T = 298 K.

Thus, ΔS = 911 J / 298 K = 3.057 J/K

Therefore, the entropy change for the irreversible process of the ideal gas is approximately 3.057 J/K.

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Answer:

Chemical element, metallic, symbol Mg, situated in group IIa in the periodic table, atomic number: 12, atomic weight: 24,312. ... Magnesium is known for a long time as the lighter structural metal in the industry, due to it's low weight and to it's capability of forming mechanically resistant alloys.

The formula for the volume of a rectangular solid is Volume = length * width * height, or V = lwh.

Converting to cm = \( \frac{660}{10} = 66 {cm}^{3 } \\ \)

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Answer:

0.225M

Explanation:

Equation: M=n/v

n = moles of solute

v = liters of solution

NaCl = 58.443 g/mol

16.88/58.443= 0.289 moles of NaCl

0.289/1.283=0.225M

Answer:

to the tooth

Explanation:

Its also a way to cook your pasta because you cook it just long enough so that it is neither hard nor soft but is firm and slightly chewy.

But if we're talking a literal translation than it would be to the tooth.

Answer:

water

Explanation:

Answer:

c. pizza

Explanation:

Pizza is a heterogeneous mixture because it components are not uniform.

Taking into account the definition of molarity, the molarity of the solution is 0.186\(\frac{moles}{liter}\).

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

\(Molarity=\frac{number of moles}{volume}\)

Molarity is expressed in units \(\frac{moles}{liter}\).

In this case, you know:

Replacing in the definition of molarity:

\(Molarity=\frac{3x10^{-3} moles}{0.0161 L}\)

Solving:

molarity= 0.186\(\frac{moles}{liter}\)

Finally, the molarity of the solution is 0.186\(\frac{moles}{liter}\).

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Answer:

c

Explanation:

coniferous trees, Tianga also called Boreal forest biome (major life zone).

hope it's perfect.

Answer: C is correct.

Answer:

A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding

Answer:  d. Cyolite

Explanation:

a.bauxite   - Aluminum ore ✅

b.haematite - Iron ore  ✅

c.calamine - an ore of zinc  ✅

d.cyolite​ -   ❌  the ore is cryolite

✅ - is an ore

❌ - not an ore

Answer: