Which generally occurs as temperature increases?

1) Endothermic reactions:

a) The reaction between ammonium nitrate and water absorbs heat from the surrounding environment.

There are two types of reaction: endothermic reaction (chemical reaction that absorbs more energy than it releases) and exothermic reaction (chemical reaction that releases more energy than it absorbs).

b) Ammonium chloride dissolved in a beaker of water makes the beaker cold.

Dissolving this salt absorbs heat from beaker.

c) Water separates on hydrogen and oxygen when an electric current is run through it.

Electrolysis of water is the decomposition reaction (heat is required), because from one molecule (water) two molecules (hydrogen and oxygen) are produced. Water is separated into two molecules.

2) Exothermic reactions:

a) Three drops of concetrated sulfuric acid added to 100 milliliters in a beaker makes the beaker hot.

Energy is released, beaker absorbs that heat.

b) Uranium atoms are split to produce nuclear energy.

Nuclear energy is released.

c) Methane and oxygen are combined to produce methanol and heat.

Balanced chemical reaction: 2CH₄ + O₂ → 2CH₃OH + heat.

You are right! That is true.

Hey there!:

Number of moles =   ( number of atoms / 6.023*10²³ atoms )

given number of atoms = 5.03*10²⁴

Therefore:

Number of moles B = 5.03*10²⁴ / 6.023*10²³

Number of moles B = 8.35 moles

Hope that helps!

B. Electrons move from metals from nonmetals creating ionic compounds.

In the KLMN electronic configuration style of writing K denotes the first shell which can hold up to two electrons, L denotes the second shell which can hold up to eight (2 + 6) or 8 electrons, M denotes the third shell which can hold up to eight (2 + 6 + 10) or 18 electrons etc.

The KLMN style of writing  only indicates the number of electrons in each principal quantum number, however the spdf electronic configuration style of writing subdivides each shell into its subshells.

For instance the 3rd principal quantum number has s,p and d subshells, wherein s, p and d orbitals can have a maximum of 2, 6 and 10 electrons respectively.

Answer is: false, carbon tetrachloride contains four single bonds.

Carbon tetrachloride or tetrachloromethane (CCl₄) is an organic nonpolar compound.

Electron configuration of carbon atom: ₆C 1s² 2s² 2p².

Electron configuration of chlorine atom: ₁₇Cl 1s² 2s² 2p⁶ 3s² 3p⁵.

Chlorine atoms have one unpaired electron, carbon atom is sp3 hybridized (has four unpaired electrons).

False, The molecule CCl4 contains only four single bonds.

The reaction will produce C. 5 mol NH₃.  

N₂ + 3H₂ ⟶ 2NH₃

Moles of NH₃= 7.5 mol H₂ × (2 mol NH₃/3 mol H₂) = 5 mol NH₃

5 moles of ammonia, [tex]NH_3[/tex], can be made from 7.5 moles of [tex]H_2[/tex].

The mole is an SI unit used to measure the amount of any substance. The abbreviation for a mole is mol. One mole is exactly 6.02214076×[tex]10^{23}[/tex] particles.

Given data:

Moles of H₂ react = 7.5 mol

Moles of NH₃ formed =?

Chemical equation:

N₂ + 3H₂       →    2NH₃

Now we will compare the moles of ammonia with hydrogen.

            H₂              :           NH₃

             3               :             2

            7.5             :          [tex]\frac{2 X 7.5}{3}[/tex]  = 5

Hence, 5 moles of ammonia would be formed from 7.5 moles of hydrogen.

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Explanation:

Elements of group 1 represented in the blue column are alkali metals.

Elements of group 2 represented in the peach column are alkaline earth metals.

Elements from scandium to zinc or all the elements represented in the green columns are transition metals.

Elements in coral pink boxes represent metalloids, that is, they show properties of both metals and non-metals.

Elements present in blue, peach, green and coral pink boxes are all metals.

Whereas elements present in pink, that is, group 18 are all noble gases.

And elements present in yellow boxes are all non-metals.

with his well-known gold foil experiment in which he demonstrated that the atom has a tiny and heavy nucleus.

Ernest Rutherford's most creative activity was his gold foil experiment conducted in 1909. This experiment demonstrated the structure of an atom, challenging existing models and earning Rutherford the title of 'father of nuclear physics'.

The activity that best demonstrates New Zealand physicist Ernest Rutherford's creativity is his gold foil experiment conducted in 1909. In this groundbreaking experiment, Rutherford and his colleagues bombarded a thin sheet of gold foil with a beam of high-energy alpha particles obtained from radioactive decay of radium. He then observed the subsequent velocities and trajectories of the particles, a method that led to revelations about the nuclear structure of the atom.

Rutherford's experimental design illuminated the small and dense nature of atomic nuclei. Rutherford placed a radioactive source in a lead container, producing a beam of alpha particles that struck a thin gold foil. The scattering of the alpha particles, observed by the glow they caused when they hit a phosphorescent screen, challenged existing beliefs about atomic structure. His seminal experiments with nuclear radiation and atomic structure earned him the title of "father of nuclear physics" and helped him win a Nobel Prize in Chemistry in 1908.

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the decay of the neutrons in the nucleus of the atom

The process of radiometric dating uses the decay of uranium-238 to lead-206 to determine the age of ancient rocks.

U-238 decays to stable Pb-206 largely by the emission of α particles, with a half-life of about 4.5 × 10⁹ a.

Thus, geologists can determine the age of rocks by measuring the relative amounts of U-238 and Pb-206.

However, the method is not “exact”.

The rock must be more than ten million years old so that enough uranium can decay to make the amount of lead measurable.

The age uncertainty for 100-million-year-old rocks ranges from 100 000 a

to 3 000 000 a.

The error margin for older rocks, say, 2.5 billion years old, can be as low

as 2 000 000 a. That’s a long time, but it’s an uncertainty of less than 0.1 %.

The density of Jena’s smoothie is 0.667 g/mL.

Mass = 200 g

Volume = 300 mL

Density = mass/volume = 200 g/300 mL = 0.667 g/mL

Answer:

rounded it is 0.67 g/ml

Explanation: i took the test it was a bit confusing but i figured it out

Hey there!:

Molar mass FeF3 = 112.84 g/mol

Number of moles  = mass of solute / molar mass

Number of moles = 24.0 / 112.84

Number of moles = 0.212 moles of FeF3

Hope that helps!

I'm pretty sure the strongest metal known to man is Tungsten.

so one liter is about 2. something gallons so at 12.8 km/l you would get about 30 mpg which is insane but yeah

Answer: The mileage rating of the car is 30.05 miles per gallon

Explanation:

We are given:

Mileage rating = 12.8 km/L

To convert this level into milligrams per deciliters, we use the conversion factor:

1 mile = 1.61 km

1 gallon = 3.78 L

Converting the above rating into miles per gallon, we get:

[tex]\Rightarrow (\frac{12.8km}{L})\times (\frac{1mile}{1.61km})\times (\frac{3.78L}{1 gallon})\\\\\Rightarrow 30.05miles/gallon[/tex]

Hence, the mileage rating of the car is 30.05 miles per gallon

Hello,

Question - Which of the following is plotted on the y-axis of a distance versus time graph?

Answer - A. Distance

Why - The reason its distance is because the fact that distance is a dependant variable and always will remian on the y axis.

that is called the Gulf Stream

question answered by

(jacemorris04)

I think the correct answer from the choices listed above would be the last option. If a decrease in temperature accompanies a reaction, then energy was absorbed which means that the reaction is endothermic. Hope this answers the question. Have a nice day.

Answer:

It should be  endothermic reaction.

Explanation:

Because it absorbs more energy than release it.

I took the test before.  

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Chemical Reactions Learning for quiz Unit 3 Lesson 2 Physics

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Answer:

A.C. and E.

Explanation:

i just got it right so that's it.

Carbon Monoxide would be the correct answer.

A chemical property of iron is its ability to combine with oxygen to form iron oxide, commonly known as rust; this process is known as corrosion. Therefore, the correct answer is that iron combines readily with oxygen "C".

The question asks about the chemical property of iron. Chemical properties describe the ability of a substance to undergo a specific chemical change. For iron, a key chemical property is its capability to combine with oxygen to form iron oxide, commonly known as rust. This process is part of a broader category of chemical changes known as corrosion. Unlike physical properties, which can be observed without changing the substance, chemical properties can only be seen as the substance is transformed into a different substance. Therefore, the correct answer to the question is C) Iron combines readily with oxygen.

Formula for water? There is no formula, but there is a symbol, if that's what you meant. The symbol for water is H2O. It means 2 Hydrogen molecules, because the symbol is H. And the O stands for Oxygen. So it meands two hydrogen molecules bonded with one oxygen molecule. Hope I helped :)

Answer:

Explanation:

what do you mean do you mean H2O

Answer:

D

Explanation:

Edge trust me

The electron domain geometries that result in a bent molecular shape are:

A bent molecular shape occurs when there are two bonded atoms and one or more lone pairs around the central atom.

A common example of a molecule with a bent shape is water. In a water molecule, the central oxygen atom is bonded to two hydrogen atoms and has two lone pairs of electrons, resulting in a bent molecular shape with a bond angle of approximately 104.5 degrees.

Thus, the shapes are;

Trigonal Planar with two atoms and one lone pair

Tetrahedral with two atoms and two lone pairs.

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Hello!

Atomic Number, is the number where the atom lays on the perodic table and can be found through the number of protons. Meaning that gallium has an atomic number of 31 !

Atomic weight, which is equal to 70 in this case, can be found by subtracting the atomic number from that total to find the remaining number of neutrons that make up the mass. So gallium has 31 protons and 39 protons.

Hope this helps answer your question.

Answer: The correct answer is 31.

Explanation:

Atomic number is defined as the number of protons or electrons that are present in a neutral atom.

Atomic number = number of protons = number of electrons

Mass number is defined as the sum of number of protons and neutrons that are present in an atom.

Mass number = Number of protons + Number of neutrons

We are given:

Number of protons = 31

Mass number = 70

Number of neutrons = Mass number - Number of protons = 70 - 31 = 39

Atomic number will be equal to the number of protons present in an atom which is 31

Hence, the correct answer is 31.

The Ideal Gas Law allows us to assume that at constant volume the variation in pressure is proportional to the variation in temperature.

Hence,

[tex]\frac{P1}{T1} = \frac{P2}{T2}\\ \\

\frac{4.50}{200} =\frac{P2}{250} \\ \\

P2 = \frac{4.50 * 250}{200}\\ \\

P2 = 5.63 atm[/tex]

Using Gay-Lussac's Law,  we get [tex]P_2[/tex]  [tex]5.625 atm[/tex] at [tex]250 K[/tex].

To find the new pressure of a gas at constant volume when the temperature changes, we use Gay-Lussac's Law, which states that pressure is directly proportional to temperature for a given mass of gas at constant volume. The formula for Gay-Lussac's Law is:

[tex]\frac{P_1}{T_1} = \frac{P_2}{T_2}[/tex]

Where:

Given:

[tex]P_1 = 4.50 \, \text{atm}[/tex]

[tex]T_1 = 200 \, \text{K}[/tex]

[tex]T_2 = 250 \, \text{K}[/tex]

[tex]P_2 = P_1 \times \frac{T_2}{T_1}[/tex]

[tex]P_2 = 4.50 \, \text{atm} \times \frac{250 \, \text{K}}{200 \, \text{K}}[/tex]

[tex]P_2 = 4.50 \, \text{atm} \times 1.25 \\ \implies P_2= 5.625 \, \text{atm}[/tex]

The new pressure of the gas at [tex]250 K[/tex] will be [tex]5.625 atm[/tex].

Anything in orbit around the Sun is basically moving fast enough to be in a constant state of freefall towards it. If the planets, for example, suddenly stopped moving they would immediately be pulled towards the Sun and fall into it.

Answer: The period of the FM wave [tex]1.1299\times 10^{-8} seconds[/tex].

Explanation:

Frequency of the wave = [tex]8.85\times 10^{7} Hertz[/tex]

Frequency is inverse of time period that is :

[tex]Frequency=\frac{1}{\text{Time period}}[/tex]

[tex]\text{time period}=\frac{1}{frequency}[/tex]

[tex]=\frac{1}{8.85\times 10^{7} Hertz}=0.11299\times 10^{-7} seconds=1.1299\times 10^{-8} seconds[/tex]

The period of the FM wave [tex]1.1299\times 10^{-8} seconds[/tex].