When is evaporation used

Answer:

B) ethanol

Explanation:

that is the answer I got it in my test

Oxidation- Reduction reaction

Answer: Elements found in group 1 (Alkaline Metals)

Explanation: Any element found in group 1, such as Lithium, Sodium, Caesium, or Francium, have similar properties as potassium. Atoms that are found in the same group on the periodic table have similar chemical properties.

On adding more CO2 equilibrium shifts to left, adding more oxygen the equilibrium shift to right,  increasing a temperature will shift the equilibrium to left and adding the catalyst will not affect the equilibrium.

According to Heisenberg Uncertainty Principle, if the equilibrium of a system of reaction is disturbed by making any changes in the property the reaction will shift into that direction by itself that stabilizes the equilibrium again.

According to the reaction,

CH4O + O2 = H2O + CO2 + Heat

a. Adding more CO₂ will shift the reaction towards the left side or we can say that adding carbon dioxide into the system will shift the reaction towards the reactant side. Because the concentration of carbon dioxide on the product side has increased, the equilibrium is disturbed so in order to stabilize the equilibrium again the reaction will shift towards the reactant side.

b. Adding more oxygen means that we are adding more amount of reactants which disturbs the equilibrium of the reaction so to stabilize the equilibrium again the reaction will shift towards the product side.

c. Increasing the temperature of the equation means that we are giving heat to the system which means that the equation or the system will shift toward the product side because the reaction is exothermic in nature.

d. Adding a catalyst will not affect the equilibrium of the reaction it will only increase the rate of the reaction.

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Answer:

Well elements are chemical substances while a compound consists of two or multiple elements put together.

Explanation:

Answer:

Elements

iron,

copper,

silver,

gold,

hydrogen,

carbon,

nitrogen,

and oxygen.

Compounds

Sugar (sucrose - C12H22O11)

Table salt (sodium chloride - NaCl)

Water (H2O)

Carbon dioxide (CO2)

Sodium bicarbonate (baking soda - NaHCO3)

Answer:

Ans A

Explanation:

no. of shells determine the group

Answer:  None of the options

Explanation: 2, 8, 4 represents a total of 14  electrons.  

The 2:   1s^2

The 8:  2s^2 2p^6

The 4:   3s^2 3p^2

Assuming a neutral atom, 14 electrons represnt element #14, Silicon.  The electron configuration matches that of silicon,  But silicon is in group  14, which is not in the options.  It is a metalloid, so if there is another grouping system, use the nuimber assigned to the metalloids.  But the word "Group"normally refers to the column number, 14 for silicon.  And I've never heard of Group 0.  

The respiratory system supplies oxygen to the blood and removes carbon dioxide. The brain monitors respiratory volume and blood gas levels. The brain regulates respiratory rate.

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One way the respiratory and nervous systems work together is through the control of breathing rate and depth based on the body's oxygen and carbon dioxide levels.

Chemoreceptor Response to Gas Levels:

Specialized sensors called chemoreceptors are located in the blood vessels, particularly in the aorta and carotid arteries, which detect changes in the levels of oxygen and carbon dioxide in the bloodstream. These chemoreceptors are part of the nervous system and play a crucial role in regulating breathing.

When the oxygen level in the blood decreases or the carbon dioxide level increases (indicating a need for more oxygen or removal of excess carbon dioxide), the chemoreceptors send signals to the brainstem, specifically to the medulla oblongata and pons. These regions of the brain are responsible for controlling involuntary processes like breathing.

The nervous system, upon receiving these signals, responds by adjusting the rate and depth of breathing to ensure that the body's oxygen and carbon dioxide levels remain within a healthy range.

For example, if the oxygen level drops due to increased physical activity, the nervous system stimulates an increase in breathing rate to bring in more oxygen. Similarly, if carbon dioxide levels rise (as during intense exercise), the nervous system triggers deeper and faster breathing to expel excess carbon dioxide.

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Answer:

A. two or more atoms held together with bonds make up a molecule. 

Explanation:

mark brainiest pls <3

50 moles of Oxygen gas would be required to completely react with 4 moles of octane.

Side note:  Throughout this explanation, we'll be referring to oxygen atoms (just a single O), and oxygen gas (\(O_2\)).  Hopefully the usage is clear from context, but I'll try to be explicit.

Main concepts

Concept 1. Alkanes

Concept 2. Combustion reactions

Concept 3. Stoichiometry

Concept 1. Alkanes

Several chemical compounds fall into a class of compounds called "alkanes".  Alkanes are a type of molecule which consist of a chain of single-bonded carbons, and hydrogen atoms that fill out the balance of the necessary bonds for each carbon.

Each carbon wants 4 bonds, so carbons on the end of the chain will only be bonded to 1 carbon, and will need 3 more bonds -- 3 hydrogens.  In contrast, each carbon in the middle of the chain will already have a carbon bonded on either side of it, so it will already have 2 bonds, and will only need 2 more bonds -- 2 hydrogens.

A general formula for the number of carbons and hydrogens is given by \(C_{n}H_{2n+2}\) where "n" is the number of carbons in the chain (the number of hydrogens will be two more than double the number of carbons).

Alkanes are named with prefixes based on the number of carbons in the chain, followed by the suffix -"ane".  Prefixes for the first 10 numbers are listed in the table below:

\(\begin{array}{cc}\text{\# carbons}&\text{prefix}\\1&\text{meth-}\\2&\text{eth-}\\3&\text{prop-}\\4&\text{but-}\\5&\text{pent-}\\6&\text{hex-}\\7&\text{hept-}\\8&\text{oct-}\\9&\text{non-}\\10&\text{dec-}\end{array}\)

So, in this case, Octane means that the alkane has 8 carbons.

This means the general formula for Octane is \(C_{8}H_{18}\)

Concept 2. Combustion reactions

All combustion reactions require oxygen gas.

For combustion reactions of substances containing only Carbon, Oxygen, and/or Hydrogen, the products of the reaction are Carbon dioxide  \(CO_2\)   and  Water \(H_2O\)

Since Octane only contains Carbon and Hydrogen, the reaction will produce Carbon dioxide and water.

Unbalanced chemical reaction:

\(\text{octane}+\text{oxygen gas} \rightarrow \text{carbon dioxide}+\text{water}\)

\(C_{8}H_{18}+O_{2} \rightarrow CO_{2}+H_{2}O\)

To balance the equation,

semi-balanced chemical equation

\(C_{8}H_{18}+O_{2} \rightarrow 8CO_{2}+9H_{2}O\)

Now, by increasing the coefficients of the Carbon dixoide and water to balance the Carbons and the Hydrogens, the number of oxygen atoms on the right has changed.  In total, on the right, there are 25 oxygen -- 16 oxygens from the eight carbon dioxides, and 9 oxygens from the nine waters.

To get 25 oxygen atoms on the left, we'll need to increase the number of Oxygen gas molecules on the left to 12.5.

However, it is common to use only whole numbers as coefficients, so to rid ourselves of the decimal, we'll need to multiply all of the coefficients by 2 (the least common denominator of all of the coefficients).

Final Balanced chemical equation

\(2C_{8}H_{18}+25O_{2} \rightarrow 16CO_{2}+18H_{2}O\)

Concept 3. Stoichiometry

If we start with 4 moles of octane, we'll need the mole ratio from the balanced chemical equation to find the number of moles of oxygen gas.

The final balanced chemical reaction requires 2 moles of octane with 25 moles of oxygen gas.

So \(2 \text{ moles of octane} = 25 \text{ moles of oxygen}\)

Creating a unit ratio with moles of octane on the bottom, we'll divide both sides of that equation by the 2 moles of octane.

\(\dfrac {2 \text{ moles of octane}}{2 \text{ moles of octane}} = \dfrac{25 \text{ moles of oxygen gas}}{2 \text{ moles of octane} }\)

Observe that the units on the left completely cancel, and 2/2 is 1...

\(1 = \dfrac{25 \text{ moles of oxygen gas}}{2 \text{ moles of octane} }\)

So, we have obtained a unit ratio

Using this unit ratio to the 4 moles of octane, we obtain the result of moles of oxygen gas:

\(\dfrac {4 \text{ moles of octane}}{} * \dfrac{25 \text{ moles of oxygen gas}}{2 \text{ moles of octane} } = 50 \text{ moles of oxygen gas}\)

So, 50 moles of Oxygen gas would be required to completely react with 4 moles of octane.

Answer: 3 ,2, 6

Explanation:

3 Cu(NO3)2 + 2 K3PO4 → Cu3(PO4)2 + 6 KNO3

The study of substances that lack the element carbon but may contain the element hydrogen is called inorganic chemistry.

Inorganic chemistry is a branch of chemistry that focuses on the study of compounds that do not contain carbon-hydrogen (C-H) bonds. While organic chemistry primarily deals with carbon-based compounds, inorganic chemistry explores the properties, structures, and reactions of substances that include minerals, metals, nonmetals, and compounds lacking carbon.

This field encompasses a wide range of topics, including the behavior of inorganic compounds in various chemical reactions, the properties of transition metals, the study of minerals, coordination compounds, and the understanding of the electronic structures of inorganic substances. Inorganic compounds can exhibit diverse chemical behaviors and are essential in many industrial applications, environmental processes, and biological systems. By studying inorganic chemistry, scientists gain insights into the unique properties and applications of non-carbon-based compounds, expanding our understanding of the chemical world beyond organic molecules.

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(a) Substance i has the lower boiling point. (b) NaBr has the lower boiling point. (c) HBr has the lower boiling point.

(a) The boiling point of a substance depends on the intermolecular forces present in it. If the intermolecular forces are weak, the boiling point will be low. Substance i has a smaller molecular weight and a weaker intermolecular force of attraction than substance ii, so it has a lower boiling point.

(b) NaBr and PBr3 are both ionic compounds. The boiling point of an ionic compound depends on the strength of the electrostatic forces between the ions. Since Pb is larger than Na, the electrostatic forces in PBr3 are stronger than those in NaBr, so PBr3 has a higher boiling point than NaBr.

(c) H2O and HBr are both polar molecules, and the boiling point depends on the strength of the dipole-dipole interactions. However, HBr is smaller than H2O and has weaker intermolecular forces of attraction. Therefore, HBr has a lower boiling point than H2O.

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Answer:I just want points

Explanation:because I need them for future questions

The moles would be 12 moles, 4 moles and 11.34 moles

When hydrogen gas (H2) reacts with oxygen gas (O2) to produce water (H2O), the balanced chemical equation is:

2H2 + O2 -> 2H2O

So,

For every 6 moles of H2, 12 moles of H2O will be produced

For every 2 moles of H2, 4 moles of H2O will be produced

For every 5.67 moles of H2, 11.34 moles of H2O will be produced.

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Answer:

CO32−

Explanation:

We have to consider the valencies of the polyatomic ions involved. Recall that it is only a polyatomic ion with a valency of -2 that can form a compound which requires two sodium ions.

When we look closely at the options, we will realize that among all the options, only CO32− has a valency of -2, hence it must be the required answer. In order to be double sure, we put down the ionic reaction equation as follows;

2Na^+(aq) + CO3^2-(aq) ---------> Na2CO3(aq)

Answer:

A).  CO32−

Explanation:

Answer:   Because planets do not have nuclear fusion, they do not produce their own light. Instead, they shine with light reflected from a star. When we see planets in the night sky, such as Venus, the so-called "Evening Star," we're seeing reflected sunlight.

Explanation:

Water shortages, flooding, and poor water quality are especially prevalent in developing countries. In the impoverished world, close than 80% of illnesses

Serious illnesses include conditions including metastatic cancer, heart problems, chronic pulmonary disease, & dementia that are associated with a significant risk of mortality and frequently last for several years in the patient.

There are four main categories of disease: physiological diseases, hereditary diseases (covering both genetic disorders and non-genetic heritable diseases), deficient diseases, and infectious diseases.

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it's actually made of silicates and believe it or not magnesium is a silicates so the closest would have to be A made of magnesium, iron, and calcium

Answer:

1s2 2s2 2p6

Explanation:

ththe noble gas config. of neon

Chloride ions outside the neuron would make it very difficult for a depolarization to occur.

In a normal resting state, the internal environment of a neuron has a net negative charge compared to the external environment.

This is known as the resting potential. During depolarization, this membrane potential switches from negative to positive very rapidly due to an influx of positively-charged cations (such as sodium) into the cell.

To interfere with this process, the ions outside of the neuron would have to shift the normal resting state so that the internal environment of the cell no longer has a net negative charge.

This will prevent the influx of cations that will cause depolarization. In order to do this, we would need to balance out the negative charge inside the cell with negative charge outside of the cell. In the list of options, chloride is the only negatively-charged ion. Therefore, the answer would be Chloride.

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Answer:

Hydrogen bonding is the major intermolecular attraction responsible for the relatively high boiling points of alcohols.

Answer: 1 mol of methane is 16 grams. Therefore, if you have 100 grams of methane, it means that you have

100

16              

=

6.25

moles of methane.

When you burn 6.25 moles of methane, you produce 6.25 moles of carbon dioxide.

When you burn 6.25 moles of methane, you need 12.5 moles of oxygen gas.

When you burn 6.25 moles of methane, you produce 6.25 moles of carbon dioxide (275 grams of

C

O      

2

) and 12.5 moles of water vapour (225 grams of

H

2

O

).

Explanation: I HOPED THAT HELPED