The constant composition of sugar, a compound containing carbon, hydrogen and oxygen, is 40. 0% carbon and 6. 67% hydrogen. What is the percentage of oxygen?.

Answer: \(1.6\times 10^4\)

Explanation:

Scientific notation is defined as the representation of expressing the numbers that are too big or too small and are represented in the decimal form with one digit before the decimal point times 10 raise to the power.

For example : 5000 is written as \(5.0\times 10^3\)

In division , the result would contain the same number of significant digits as there in the least precise number , thus the answer would have 2 significant digits.

\(\frac{1.248\times 10^{-2}}{7.8\times 10^{-7}}=1.6\times 10^4\)

Answer:

27

Explanation:

base on what u have see in the pictorial.

The volume of the liquid in the graduated cylinder shown below is 28 milliliters.

The graduated cylinder is also known as the measuring cylinder which is used to measure the volume of the liquids to perform the experiments in the laboratory as the quantity varies of everything for experiments.

The marks written on it show us the amount of liquid filled in the milliliters they can be from 10 milliliters to 50 milliliters made up of glass but sometimes made up of fiber too and the marks give the amount of liquid.

Therefore, the volume of the liquid in the graduated cylinder shown below is 28 milliliters.

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The pH of the buffer solution after 5.0 mL of 4.0 M NaOH solution is added is 4.85.

To calculate the pH of the solution, we need to determine the concentration of the acetic acid (CH3COOH) and its conjugate base (CH3COO-) after the addition of the NaOH solution.

First, let's calculate the initial concentrations of CH3COOH and CH3COO-. The buffer is made by adding 0.3 mol of CH3COOH and 0.3 mol of sodium acetate (NaCH3COO) in enough water to make a 1 L solution. The molar concentration of CH3COOH is therefore:

[CH3COOH] = 0.3 mol / 1 L = 0.3 M

Since the buffer is made of a weak acid (CH3COOH) and its conjugate base (CH3COO-), we can assume that the initial concentration of CH3COO- is also 0.3 M.

Now, 5.0 mL of 4.0 M NaOH solution is added to the buffer. This will react with the acetic acid to form sodium acetate and water, according to the following balanced chemical equation:

CH3COOH + NaOH → NaCH3COO + H2O

Before we calculate the new concentrations of CH3COOH and CH3COO-, we need to determine how many moles of CH3COOH are neutralized by the NaOH. The number of moles of NaOH added is:

n(NaOH) = C(NaOH) x V(NaOH) = 4.0 mol/L x 0.005 L = 0.02 mol

Since acetic acid and NaOH react in a 1:1 ratio, 0.02 mol of CH3COOH will be neutralized by the NaOH. This means that the final concentration of CH3COOH will be:

[CH3COOH] = (0.3 mol - 0.02 mol) / (1 L + 0.005 L) = 0.277 M

Similarly, the final concentration of CH3COO- can be calculated by adding the moles of NaCH3COO produced by the reaction to the initial concentration of CH3COO-:

[CH3COO-] = (0.3 mol + 0.02 mol) / (1 L + 0.005 L) = 0.318 M

Now, we can use the Henderson-Hasselbalch equation to calculate the pH of the buffer solution:

pH = pKa + log([CH3COO-]/[CH3COOH])

The pKa of acetic acid is 4.76. Substituting the calculated concentrations, we get:

pH = 4.76 + log(0.318/0.277)

pH = 4.85

Therefore, the pH of the buffer solution after 5.0 mL of 4.0 M NaOH solution is added is 4.85.

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Answer:

Ammonia (NH3) is composed of Nitrogen and 3 Hydrogens

Explanation:

Answer:

a pH above 7 is alkali

a pH lower than 7 is acidic

Answer:

0.2 M

Explanation:

Please see the attached pictures for the full solution.

The picture below represents atoms with a covalent bond. Option B is the correct answer.

In order to maintain stability, covalent bonds, a particular kind of chemical link, form between hydrogen atoms, nonmetals, and semimetals. The exchange of one or more pairs of electrons between two atoms forms a covalent connection. The two atomic nuclei are drawing these electrons in unison.

When there is insufficient space between two atoms' electronegativities for an electron transfer to take place and create ions, a covalent bond is formed. In organic chemistry, covalent bonds predominate over ionic bonds by a wide margin.

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The complete question is:

Look at the picture below.

What does this picture represent?

A. Atoms that are ions

B. Atoms with a covalent bond

C. Atoms with no bond

D. Atoms with

The number of moles of carbon, C, in the original sample is 0.83 moles.

Combustion analysis allows us to determine the composition of a compound by measuring the amounts of carbon dioxide and water produced. In this case, 7.00 g of the unknown compound produced 10.3 g of carbon dioxide and 4.20 g of water. To calculate the number of moles of carbon in the sample, we need to find the moles of carbon dioxide formed during combustion.

We can start by converting the mass of carbon dioxide into moles using its molar mass. The molar mass of carbon dioxide (CO2) is approximately 44.01 g/mol (12.01 g/mol for carbon and 16.00 g/mol for oxygen). Dividing the mass of carbon dioxide (10.3 g) by its molar mass gives us the number of moles: 10.3 g CO2 / 44.01 g/mol = 0.234 mol CO2.

Since carbon dioxide (CO2) has a 1:1 mole ratio with carbon (C) in the combustion reaction, we can conclude that there are 0.234 moles of carbon in the original sample.

Combustion analysis is a crucial technique used in chemistry to determine the elemental composition of a compound. By quantifying the amounts of carbon dioxide and water produced during combustion, it is possible to calculate the number of moles of carbon, hydrogen, and oxygen in the original compound.

This information can then be used to deduce the molecular formula of the unknown compound. By utilizing the principles of stoichiometry and the molar masses of the involved elements, scientists can derive valuable insights into the composition and structure of various organic compounds.

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The heat of combustion of the butane that we have here is 2037 kJ/mol.

Enthalpy of combustion, also known as heat of combustion, is the energy released or absorbed as heat when a substance undergoes complete combustion with oxygen under standard conditions. It is usually measured in units of kJ/mol or kJ/g.

Given that;

ΔH = mcdT

ΔH = 250 * 4.2 * (42.9 - 23.5)

= 20.37 kJ

Number of moles of butane = 0.600g/58 g/mol

= 0.01 moles

Enthalpy of combustion =-(20.37/0.01)

=2037 kJ/mol

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Answer:

Phenotype

Explanation:

The observable physical characteristics of an organism, as determined by both genetic makeup and environmental influences.

The question is asking about the observable physical characteristics of organisms.

We can eliminate options B and C because they don't make much sense. An organelle is a structure in a cell which conducts cellular functions, and the morphology of an organism is basically the anatomy and physiology of the organism, which isn't quite what we're looking for.

Keeping this in mind, here is some information on prefixes:

geno - relating to genes

pheno - relating to what's observable

The second one sounds a lot like what we're looking for, and just in case, the definition of phenotype is the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.

Therefore your answer is: A. phenotypes

The given reaction is already balanced, that is to say tha the number of atoms in the reactants matches the number of atoms in the products. In the reaction, we can see the relationship between CaC2 and H2O. For each mole of CaC2 two moles of H2O react.

So, if 4.8 moles of CaC2 are consumed the moles of H2O needed will be:

Mol of H2O = Mol of CaC2 x 2

Mol of H2O = 4.8 x 2 = 9.6 mol of H2O

Now, to calculate the grams of H2O we will use the following equation and the mass molar of H2O.

Mass molar of H2O =18.01 g/mol

So, if 4.8 moles of CaC2 are consumed in this reaction, 172.9 g of H2O are needed

Answer:

The more energy needed, the higher the melting point or boiling point . Since the electrostatic forces of attraction between oppositely charged ions are strong, their melting and boiling points are high.

Explanation:

hope this helps.

The  repeat  unit  molecular  weight  of polypropylene is 42.08 g/mol . For polypropylene, each repeat unit has three carbons and six hydrogens.  

Thus, m= 3(AC) + 6(AH)

             = (3)(12.01 g/mol) + (6)(1.008 g/mol)

             = 42.08 g/mol

Now computation of the  number-average molecular  weight.  

Since  the  degree  of polymerization (DP) is 25,000,

number-average molecular weight = (DP)m

                                                          = (25,000)(42.08 g/mol)

                                                          = 1,052,000 g/m

It is a  thermoplastic polymer made from propylene units.

Polymerization is the process of forming long chainlike compounds reacting monomer molecules together in a chemical reaction.

It is the sum total of weight of all the atoms present in a substance.

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The molarity (in mol/l) of the naoh solution is  0.1191M .

The reaction between KHP and NaOH is 1:1molar

KHP(aq)+ NaOH(aq)  -----> NaKHP(aq) + H2O(l)

mole= mass/molar mass

moles of KHP = 0.400g /204.22g/mol = 0.001959mol

0.001959moles of KHP react with 0.001959moles of NaOH

moles of NaOH present in the 16.45ml of NaOH solution = 0.001959mol

molarity = number of moles of solute per liter of solution

molarity of NaOH = (0.001959mol/16.45ml) ×1000ml = 0.1191M

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Answer:

How many gallons of water are on earth?

Why does salt water make you sticky and burn our eyes so bad?

Explanation:

These are just a couple questions I came up with just now

I hope that this helps

the bond order for one carbon-carbon bond in the benzene molecule, taking σ and π bonding into consideration will be 1.5.

In the benzene molecule, there are 6 carbon atoms arranged in a hexagonal ring, with alternating single and double bonds. Each carbon atom is covalently bonded to two other carbon atoms, with one single bond and one double bond.

To calculate the bond order for one carbon-carbon bond in benzene, we need to take into account both the σ (sigma) and π (pi) bonding. The σ bond is formed by the overlap of two atomic orbitals along the internuclear axis, while the π bond is formed by the overlap of two atomic orbitals perpendicular to the internuclear axis.

In the case of benzene, each carbon-carbon bond has one σ bond and one π bond. The total bond order for each bond can be calculated as the sum of the bond orders for the σ and π bonds. The bond order for a σ bond is 1, while the bond order for a π bond is 0.5.

Therefore, the bond order for one carbon-carbon bond in the benzene molecule is:

Bond order = (σ bond order) + (π bond order) = 1 + 0.5 = 1.5

So the bond order for one carbon-carbon bond in the benzene molecule is 1.5.

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The correct answer is option D.

Among the trace minerals, iron is the mineral that is found in highest concentrations in the body.

In human body, there are 21 trace minerals that are expected to be present including copper, zinc, iron cobalt, manganese, and fluoride.

The function of each trace mineral varies and they play huge role in the growth and development process.

For proper functioning of human body, only small quantities of these minerals are required. Among 21 minerals, iron is found in huge quantities.

Certain foods are rich sources of these minerals. However, deficiency or excess of these minerals can lead to serious health issues.

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Answer:

pretty sure it’s a solid

Explanation:

Answer:

Which of the following pairs lists a substance that can neutralize Ca(OH)2 and the salt that would be produced from the reaction?

HCl and CaCl2

HClO and CaHClO

H2O and Ca(OH)3

H3PO4 and Ca(PO3)2

Explanation:

The given substance is Ca(OH)2 which is a base.

To neutralise a base an acid is required.

Among the given options,

HCl and H3PO4 are the acids.

The salts foremd when calcium hydroxide reacts with the respective acids are CaCl2 and Ca3(PO4)2.

But among the given options, only the forst option that is

HCl and CaCl2 shows the correct formulas.

Hence, the answer is first option.

Answer:

HCl and CaCl2

Explanation:

The oxidation number for n in the compound \(NH_{3}\) will be -3.

The charge an atom would have if all of its links to other atoms formed fully ionic could be known as the oxidation state, also known as the oxidation number. It describes how much an atom in a chemical molecule has been oxidized. The oxidation state can theoretically be positive, negative, and zero.

The oxidation number of N in  \(NH_{3}\) will be calculated as:

Let the oxidation number of H is 1.

\(NH_{3}\) = 0

x + 3(1) = 0

x = -3.

Therefore, the oxidation number for N in the compound \(NH_{3}\) will be -3.

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The group VIA elements are called chalcogens because most ores of copper (Greek chalkos) are oxides or sulfides, and such ores contain traces of selenium and tellurium.

According to the electronic configuration,elements of group 16  would most likely bond with group 2 elements as group 16 has charge -2 which is balanced by group 2 elements with charge +2.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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Answer: liquid state. (Estado liquido)

Explanation:

I will answer in English.

When you want to give a shape to a metal, the best option is using metal in liquid state (because as you know, the liquids take the shape of the container where they are in).

So the industries heat the metals until the metals reach the fusion point (so they change of phase, from solid to liquid)

Then the liquid metal is placed in a special container with the wanted shape.

Answer:

joules or watts

Explanation:

Answer:

the answer is B: watts

Explanation:

edge

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At equilibrium, the total pressure remains constant due to equal moles of reactants and products. The equilibrium partial pressure of HCl is 1.96 atm. The student's statement is incorrect. Total pressure: 2.312 atm.

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The grocer's power output is 60 Watts. Power is measured in Watts, which represents the rate of energy transfer or work done per unit time.

Power is defined as the rate at which work is done or energy is transferred. It can be calculated using the formula: Power = Work / Time.

In this case, the work done by the grocer is equal to the force applied multiplied by the distance moved. The force applied is 100 N and the distance moved is 1.5 m, so the work done is:

Work = Force * Distance

Work = 100 N * 1.5 m

Work = 150 Joules

The time taken to perform the work is 2.5 seconds. Now we can calculate the power output:

Power = Work / Time

Power = 150 Joules / 2.5 seconds

Power = 60 Watts

Therefore, the grocer's power output is 60 Watts. Power is measured in Watts, which represents the rate of energy transfer or work done per unit time. It indicates how quickly the grocer is able to lift the crate of apples to the shelf.

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Answer:

the outcome of something

Answer:

the valency of sodium is one because sodium loses 1 electron to become stable

9) The reaction is spontaneous as written

10) The reaction is not spontaneous as written

A spontaneous reaction is a chemical reaction that occurs without the need for an external energy input, such as heat or electricity. It is a reaction that occurs naturally, without any outside assistance, and proceeds on its own without the need for additional energy to be added to the system.

It is important to note that a spontaneous reaction does not necessarily mean that the reaction will occur quickly or with a high rate. The rate of a reaction depends on various factors, such as the concentration of reactants, temperature, and the presence of catalysts.

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