What are the elements at the bottom of the table called?

The safest temperature to avoid scalding is 120 degrees Fahrenheit, but 140° seems to be the common default option. Most experts believe that any under 120 degrees Fahrenheit increases the risk of bacteria, such as legionella, which causes Legionnaire's disease, developing inside the hot water system from stagnant water.

The Fahrenheit scale is a thermal scale that was proposed by physicist Daniel Gabriel Fahrenheit in 1724. The degree Fahrenheit is the unit of measurement. Fahrenheit is a temperature scale in which ice forms at 32 degrees & boils at 212 degrees. The symbol ° F represents it.

Temperature is a physical measure that quantifies our feelings of hotness and coldness. A thermometer is used to measure temperature.

Thermometers are scaled in a variety of temperature scales that have historically been defined by various points of reference and thermometric substances.

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Answer:

thermal decomposition

The statement above which identifies the best phrase which describes the movement of air in general is: from high pressure to low pressure.

The correct answer choice is option a.

Air is regarded as a mixture due to the fact that it contains different substances such as carbon dioxide, oxygen, rare gases, dust, water , moisture and so on and so forth. However, air usually moves from high pressure to low pressure simply because as air particles warm, it usually ascends, leading to low pressure at the surface.

In conclusion, we can now confirm and deduce from the explanation given above that air too moves from one point to another.

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Answer:

A.

Explanation:

Ten cc propane would require 50 cc oxygen TO BURN ALL OF THE PROPANE; HOWEVER, some propane will burn if some oxygen is present. If less than 50 cc not all of the propane will burn.

Yes, it will freeze at 0 degree Celsius. The correct option is A.

The temperature at which a liquid solidifies is known as the freezing point. Similar to the melting point, the freezing point typically rises with increasing pressure.

The freezing point depression equation must be used to calculate the freezing temperature of a solvent and solute mixture. You can use this equation to determine how adding a solute alters a solvent's freezing point.

ΔTf = Kf x molality

Here,

Mass of the solvent = 100 mL x 1 g/mL = 100 g

Molality of the solute = 10 g / 58.44 g/mol = 0.171 mol

Molality of the solvent = 0.171 mol / 100 g = 0.00171 mol/g

So,

ΔTf = 1.86 °C/m x 0.00171 m = 0.00316 °C

Thus, the correct option is A.

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I agree with the student's statement that states that ozone depletion is causing global warming.

Ozone layer depletion is the gradual thinning of the earth’s ozone layer in the upper atmosphere caused due to the release of chemical compounds containing gaseous bromine or chlorine from industries or other human activities.

The ozone layer is a region in the earth’s stratosphere that contains high concentrations of ozone and protects the earth from the harmful ultraviolet radiations of the sun.

Global warming is a sustained increase in the average temperature of the Earth, sufficient to cause climate change.

Greenhouse gases emitted into the atmosphere are the causes depletion of ozone layer, which in turn leads to global warming.

Chlorofluorocarbons or CFCs are the main cause of ozone layer depletion. These are released by solvents, spray aerosols, refrigerators, air-conditioners, etc.

Therefore, the statement made by the student is correct and I agree with it.

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Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore, when the pressure decreases, molar volume increases. Ideal gas is a hypothetical gas.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature. There is no force of attraction between the particles.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of gas

V= volume of gas

n =number of moles of gas

T =temperature of gas

R = Gas constant = 0.0821 Latm/Kmol

According to above equation we can see that pressure is inversely proportional to volume. On decreasing the pressure, volume will increase.

Therefore, when the pressure decreases, molar volume increases.

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Answer:

A. molar volume increases

Explanation:

Checked on edge.

Answer:

0.0183 moles are needed

Answer:

H +O2 gives H20 means water

C + O2 gives Co means carbon monoxide

Al+ O2 gives Al2O3 means Aluminium oxide

Mg +O2 give MgO2 means magnesium hydroxide

Answer:

c

Explanation:

Whatever is left :

42.9 - 6.6 - 23 = 13.3 kpa

Answer:

13.3 kpa

Explanation:

A polar covalent bond.

Polar covalent bond:

A covalent bond in which the electron density is unevenly shared between the two bonded atoms, due to a difference in electronegativity or due to inductive effects.

There is a bond between the atoms, and electrons are shared, but they are pulled more closely towards one of the atoms in the bond. The atom that pulls the electrons more closely has a slight negative charge, and the other atom has a slight positive charge in the opposite direction.

In HBr, both H and Br are nonmetals so the bond must be covalent. The difference in their electronegativities is:

ΔE = |EN(H)-EN(Br)| = |2.20-2.96| = 0.76

Hence this bond recognized as Polar covalent bond.

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Answer:

7 covalent bonds

Explanation:

Answer:

In these compounds carbon, nitrogen, oxygen, and chlorine atoms have four, three, two, and one bonds, respectively.

Explanation:

The unidentified compound's weight in the recipe is To find the fraction, divide the percentage by 100. 63.55 divided by the fraction equals the molecular weight. 225.4 atomic units.

It is utilized in pyrotechnics, pyrolysis, anti-fouling coatings, flame proofing, printing, photocopying, and electrolysis operations. The atomic number 29 and chemical symbol Cu are assigned to the element copper.

Cu2O, Cu2Cl2, and cuprous sulfide are a few of the significant commercial compounds of copper(I) (Cu2S). The mineral cuprite, which contains cuprous oxide as a reddish brown or red crystal or powder, naturally occurs.

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The specific heat of the metal is 25.58°C. The amount of heat required to increase the temperature of 1 gram of a substance by 1 degree Celsius (°C) is known as specific heat.

Since water has a higher specific heat than other substances, it requires more energy to raise its temperature.

                                        -q  = q

                                 -mcΔT = mcΔT ……..(1)

ΔT represents the temperature change.

c represents the specific heat capacity.

It is assumed that the initial temperature of the zinc metal = T.

The specific heat capacity (c) of water = 4.184 J / g °C.

(-31.0g) × (69.84) × (26°C - T) = (55.26g) × (4.184J/g°C) × ( 26°C - 22.15°C)

2165.04 × (26°C - T) = 889.29 J

56291.04 - 2165.04 T = 889.29

- 2165.04 T = -55401.75

T = -55401.75/-2165.04

T = 25.58°C

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The correct statement about alkali metals and nitrate salts is c) Alkali metal salts and nitrate salts  are always soluble.So,correct option is c.

Salts of the alkali metal salt and the ammonium ion, Li+, Na+, K+, and NH₄+ are used to  soluble. Most importantly all metal nitrates and metal acetates are soluble.

The solvency of the metal nitrate in water containing carbon dioxide causes the arrangement of caverns with stalagtites and stalagmites and is liable for hardness in water. Other significant mixtures are the carbide, chloride, cyanamide, hypochlorite, nitrate, and sulfide. The dissolvability of silver nitrate is low to such an extent that everything except an irrelevant measure of it is hastened when overabundance sodium chloride arrangement is added to silver nitrate arrangement. What might be the heaviness of the hasten shaped when 100 ml of 0.5 M NaCl is added to 50.0 ml of 0.100 M AgNO₃.

Hence,correct option is c.

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(Complete question) is:

To start, watch as we mix various metal nitrates and Alkali metal salts. Which statement is true?

a) Alkali metal salts are soluble and nitrate salts are not.

b) Alkali metal and nitrate salts are never soluble.

c) Alkali Metal and Nitrate salts are always soluble

d)Alkali metal salts are not soluble while nitrate salts are soluble

Answer: No

Explanation:

To solve this, we need to have a clear concept behind reactions of chemical reagent. Therefore, the reagents can be filled in below given ways.

The word "reagent" refers to a chemical component (a compound or combination, often of inorganic or tiny organic molecules) injected into organic chemistry to produce the desired conversion of an organic material. Collins, Fenton, and Grignard reagents are among examples.

The reagent  needed to carry out each reaction are:

For first reaction, reagent needed are HBr and KOC(CH[tex]_3[/tex])[tex]_3[/tex].

For second reaction, reagent needed are TsCl, pyridine and KOC(CH[tex]_3[/tex])[tex]_3[/tex].

For third reaction, reagent needed are TsOH, NBS and KOC(CH[tex]_3[/tex])[tex]_3[/tex].

For first reaction, reagent needed are Cl[tex]_2[/tex],H[tex]_2[/tex]O, NaH and HBr.

Therefore, the reagents can be filled in above given ways.

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Carbon has four valence electrons, so it can achieve a full outer energy level by forming four covalent bonds.

Because of its small size and ability to tightly hang on to the shared pairs of electrons, carbon forms strong bonds with the majority of other elements.

Carbon is 2,4 in its electrical form. As a result, it typically creates covalent compounds because it is unable to add or subtract four electrons to complete an octet. Methane is a prime example of such a substance (CH4).

The electrons closest to the nucleus experience the least attraction from it, making them the most reactive. Valence electrons are these electrons. The most significant part of chemical bonding is played by them.

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The molarity of C2H5OH water solution which will freeze at -10 degree Celsius is 5.3 molar.

What is molarity?

A solution's molar concentration, also known as molarity, is the number of moles of solute present in a specific number of liter of the solution, or moles per liter.

Two indicators are used to measure it: the volume of the solution and the quantity of solute molecules. In essence, liter are used to measure the volume of the solution. "M" stands for "molarity."

According to the given question:

The depression if the freezing point

ΔTf = i ⋅ Kf ⋅m

ΔTf = -10 °C= 10 K = the depression if the freezing point

i = 1= van't Hoff's factor (ethanol is non electrolyte and does not dissociate in aqueous solution).

Kf =1.86 Kkg/mol= molal depression in freezing point constant

m= molality

ΔTf =i⋅ Kf ⋅m

10 K=1×1.86 K kg/mol × m

m=5.3 mol/kg=5.3 m

Hence, the molality of solution is 5.3 m.

Complete question:

What is the molality of C2H5OH in water solution which will freeze at -10 degree Celsius?

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Exposure route can be defined as a way by means of which a person can come in contact with the hazardous chemicals, this can be prevented by wearing personal protective equipments.

Personal protective equipment is a protective clothing which is worn to protect the wearer's body from hazard or injury.The hazards which can be addressed by the use of personal protective equipment are physical,chemical and bio hazards.

It imposes a barrier between the user and the working environment.The main purpose of personal protective equipment is to reduce exposure of employees to the hazards.

It has a limitation that it does not eliminate the hazard and may lead to harm to the employee if the equipment is damaged.

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Answer:

This lift usually comes from differences in air density. Warmer, less dense air rises upward, creating lift. As the air lifts higher and higher, it causes a storm cloud to grow taller and taller. Thunderstorm clouds can rise up to 10 miles into the air!

Atoms will combine with each in order to become more chemically stable. Compounds are formed between two atoms that have incomplete outer energy levels. The two types of compounds that can be formed between atoms are ionic and covalent. Ionic compounds are formed between two oppositely charged atoms. ionic compounds contain a metal ion and a non - metal ion:

Metals will lose electrons to form positive ions and nonmetals will gain elections to form negative ions. These oppositely charge ions are very attracted to each other and forms very strong bonds as a result.

Ionic compounds are characterized by crystalline structure.

High melting and boiling points, and are solids at room temperature.

Two non-metals will combine to form covalent compounds. Covalent compounds are formed when two atoms share one or more pairs of electrons The force of attraction between the main relatively weak. Covalent compounds are characterized by low melting and boiling points, and can be gases, liquids and soft solids at room temperature.

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The concentration of the HCl (aq) solution was at least 1.0 M.

What is concentration?

The abundance of a constituent divided by the sum of the mixture's volumes is the definition of concentration in chemistry. There are several different categories of mathematical description: mass concentration, molar concentration, number concentration, and volume concentration

P = 0.095atm(corresponds to 0.20g of CaCO3

so,moles of CaCO3 =0.20g/100gmol⁻¹=0.002moles

moles of HCl =(molesₓCaCO3ₓ2)=0.002ₓ2

M=0.004/4ₓ100

Concentration of HCl=1M

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The bond formed between the sodium bicarbonate is known as ionic bonds. They are known as metallic bonds and leads to the formation of cations.

The molecular weight  sodium bicarbonate of is 84.007. Sodium bicarbonate is known as an odorless white crystalline powder which can also form lumps.

They are slightly alkaline  in nature having a bitter taste.

The monosodium salt of carbonic acid, sodium bicarbonate which also has alkalinizing and electrolyte characteristics is known as sodium bicarbonate.

They dissociates into sodium and bicarbonate ions by decomposition. Ion generation raises blood pH by increasing plasma bicarbonate and buffering excess hydrogen ion concentration.

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Land absorb more radiation from the solar energy than water and retains the absorbed heat.

As the earth surface is darker compared to the water surface, more radiations gets absorbed, so it heats up quickly. Water surface reflects most of the incoming radiations, so it takes longer for water to get heated. Also, it takes less energy to rise the temperature on land than water, because water has higher specific heat capacity. Also water cools downs slowly because of this.

Due to this difference in heating and cooling properties of land and water, the differences in temperature and air mass movement occurs across land and water. During day time, as it absorbs more radiations, the land gets heated up quickly and temperature of water changes only slightly. During night, the temperature of lands drops quickly, but water will retain the temperature for long period.

Thus land gains and lose heat quickly compared to water and this result in climatic changes across different areas.

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Kf, at 25 °C, is 713 for the reaction  M(H2O)mn+(aq)+por(aq)⇌M(por)n+(aq)+mH2O(l)

The chemical compound porphine, sometimes known as porphin, has the formula C20H14N4. It is the simplest of the tetrapyrroles since it is composed of four pyrrole-like rings connected by four methine (= C H ) groups to form a bigger macrocycle ring. The molecule is flat. It is categorized as a heterocyclic and aromatic chemical. The measure of a system's chaos is called entropy. It is an extensive characteristic of a thermodynamic system, which indicates that the amount of matter in the system affects how much it is worth. Entropy is frequently represented in equations by the symbol S and is measured in joules per kelvin (JK1) or kg/m2/s2K1. The entropy of a well organized system is low.

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Matter is everything that occupies physical space. Everything on earth, including the atmosphere, that occupies space and has a certain mass is considered matter.

Anything that occupies space and has mass is considered to be matter. The world around you is composed of matter. A general phrase for the "stuff" all around you is matter. An item has a quantifiable size or volume when it occupies space. A measurement of matter's resistance to acceleration is its mass. Everything around us takes up space. Now, we are aware that matter refers to everything that takes up space. Atoms are the minuscule constituents of matter. Typically, we focus our studies solely on the three states of matter: solid, liquid, and gas.

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Answer:

The best conductor is Copper

Explanation:

because it's able to generate more heat than the other 2

0.054 gm of of HI should be present in 0.300 l of solution to obtain a solution with each pH value.

A solution's pH is a measure of its hydrogen ion concentration, which is a measure of its acidity. Pure water dissociates slightly into hydrogen and hydroxyl (OH) ions in equal proportions.

In chemistry, pH is a scale used to quantify the acidity or basicity of an aqueous solution. It was traditionally denoted as "potential of hydrogen". The pH of acidic solutions is lower than that of basic or alkaline solutions.

Indicators may be used to monitor pH since their colour varies as the pH changes. A visual comparison of the colour of a test solution with a standard colour chart allows for precise pH measurement to the closest whole integer. Color may be quantified more precisely if it is measured spectrophotometrically with a colorimeter or spectrophotometer.

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