Why does every chemical reaction require a certain amount of activation energy? A. Energy is released when the reactants begin to react. B. Energy lost to the environment during the reaction must be replaced. C. Forming the activated complex requires energy. D. The products have more potential energy than the activated complex. E. The reactants have less potential energy than the products.

The functional group of aldehyde is - COH

This group is attached to another carbon chain  giving the hydrocarbons that  contain this functional group  the general formula: R-COH

The functional group gives the aldehydes their chemical properties as it can be displaced during reactions to form new compounds.

Answer:

- COH

Explanation:

The basic cell is a neuron

This is FALSE

The soil would be almost infertile after all the magma and heat. It cannot grow crops and plants will not be able to survive. It becomes 'baked' and therefore is very hard to grow ANYTHING

However after a period of time, the soil can make use of volcanic nutrients and grow lush plants (but this is after a while)

After a volcanic eruption, it is nearly impossible for plant life to grow due to the poor soil is a false statement.

A volcanic eruption is when lava and gas are released from a volcano—sometimes explosively.

After a volcanic eruption,the soil in this region is rich because volcanic eruption deposits the necessary minerals, which are then weathered and broken down by rain. Once absorbed into the soil, they become a steady supply of nutrients for plant life.

Hence, the correct answer is false.

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E = m × c × θ,

A yellow flame is produced by sodium

Blue,green,orange and red

Answer: Options A and E

Explanation: since A is non electrolyte , doesn't form any ions in aqueous solution. Hence non conducting and distilled water is pure without any ions and has only neutral water molecules. Hence it is non conducting substance.

And remaining all are ionic compounds and gives ions in aqueous solution and conduct the electricity. Hence they all acts as conductors.

Answer:

sucrose C12H22O11 and distilled water

Best Answer:  Total number of moles n = PV/RT = (12.5atm x 10L)/(0.082 x 298K) = 5.1154 mole  

30g of oxygen = 30g/32g/mol = 0.94 mole. Also 30g of nitrogen = 30g/28g/mole = 1.07 moles.  

Let the number of moles of CO2 be = c,  

0.94 + 1.07 + c = 5.1154. Hence c = 3.105 mole = number of moles of CO2  

Mass of CO2 = 3.105 moles x 44g/mole = 136.62g ~ 137g

Answer:

Collecting residue samples.

Explanation:

All the other given options are equally important on the exploration of a bomb aftermath.

The most important task is the collection of residue samples since it needs highly skilled personel to collect accurate samples for later on analysis.

Identification of meaningful collection areas is a technical skill that requires the most experienced team memebers.

Answer: Collecting residue samples from the scene.

Explanation:

Collection of the residues after the explosion will be the most important task that is required to be done immediately this is because of the fact that the explosive residues at the site of the crater may consists of residues which may contain both volatile and non-volatile substances which are likely to be blown away soon after explosion. Thus if not collected in proper time the type of explosive used for explosion will remain undetected.      

The molecular weight of NaCl is 58.5 g/mol. 737 g/58.5 g/mol = 12.6 mol. So, there are 12.6 moles of NaCl in the box.

Taking into account the definition of molar mass, 12.61 moles are in 737 grams of NaCl.

But first, the molar mass of a given substance is a physical property defined as the mass of one mole of a substance, which can be an element or a compound.

In a compound the molar mass is equal to the sum of the weight or atomic mass of its atoms multiplied by its quantity; that is, the molar mass of the elements of the compound must be added multiplied by the times they appear.

In this case, the atomic mass of the elements of the compound are:

Then the atomic mass of the compound NaCl is:

NaCl= 23 g/mole + 35.45 g/mole

NaCl= 58.45 g/mole

Then you can apply the following rule of three: if by definition of molar mass 58.45 grams of the compound are contained in 1 mole, 737 grams are contained in how many moles?

[tex]amount of moles=\frac{737 gramsx1 mole}{58.45 grams}[/tex]

amount of moles= 12.61 moles

In summary, 12.61 moles are in 737 grams of NaCl.

Learn more:

In a sample of MgCl2, there are 6 moles of chlorine for every 3 moles of MgCl2. Two moles of H2O are required to produce 1 mole of O2. One mole of H2 gas contains 2 moles of hydrogen atoms, and there are 6.02 x 10^23 atoms or molecules in a mole.

To answer your questions about moles and stoichiometry:

In order to measure the zone of inhibition we measure the diameter of the zone of inhibition including the diameter of the disc.

A Zone of Inhibition Test, also called a Kirby-Bauer Test, is a qualitative method used clinically to measure antibiotic resistance and industrially to test the ability of solids and textiles to inhibit microbial growth. The zone is measured by the diameter across the zone and you do not consider the disc at all. Zone is measured from edge to edge of the clear area , which means disc will be inside and included in the measurement.

Water vapor in the air

Answer:

The answer is water vapor.

Explanation:

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants

Answer:  Because of the property known as Catenation.

Explanation:  Catenation is the property of making molecules by self linkage.

This is the property mostly exhibited by the carbon. Thus it is famous for creating large molecules or large chains of carbon and hydrogen atoms.

This property is also exhibited sulfur of the chalcogen family.

The structure of a carbon atom enables it to form large molecules as it can form four chemical bonds to the other atoms as well. It usually forms covalent bond by sharing of the electrons.

all i really know is that STP (standard temperature and pressure) represents conventional conditions established by IUPAC with T = 273.15 K, P = 1 atm . Now putting these values of temperature and pressure at STP, we can calculate easily volume occupied by 1 mol of gas and which comes out to be 22.4 L. hope this helps

Answer:

Volume of the gas is 90.2 ml

Explanation:

Given:

Initial volume, V1 = 80.0 ml = 0.080 L

Initial pressure, P1 = 109 kPa = 1.076 atm ( 1 kPa = 0.00987 atm)

Initial temperature, T1 = -12.5 C = -12.5 + 273 K = 260.5 K

Under STP conditions i.e. standard temperature and pressure we have:

Pressure, P2 = 1 atm

Temperature, T2 = 273 K

Formula:

Based on the ideal gas relation we have:

[tex]\frac{P1V1}{T1} =\frac{P2V2}{T2} \\\\V2 = \frac{P1V1}{T1} (\frac{T2}{P2} ) = \frac{1.076*0.080}{0.260.5} (\frac{273}{1} )=0.0902 L[/tex]

as water is cooled it's density increases until about 4 c then it decreases

Answer:

As water is cooled its density increases 4 degrees Celsius is reached

Explanation:

the law that the product of the pressure and the volume of one gram molecule of an ideal gas is equal to the product of the absolute temperature of the gas and the universal gas constant.

Ideal Gas Law has been described below.

According to Ideal gas law , the product of Pressure and Volume for 1 mole of an ideal gas is equal to the product of Temperature and Universal Gas Constant R

The equation is represented by

PV = nRT

It is valid only for ideal gases and no gas is ideal, At STP all the gases are considered to behave ideally.

It is a combination of the empirical Boyle's law, Charles's law, Avogadro's law, and Gay-Lussac's law.

It relates the macroscopic properties of gases.

It has wide applications in the processes where gas is involved.

To know more about Ideal Gas Law

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It should be an Ion. Sorry.

The atom with 24 protons, 20 electrons, and 28 neutrons is a chromium ion with a +4 charge and a mass number of 52.

An atom with 24 protons is an atom of the element chromium (Cr), which has an atomic number of 24. The atomic number represents the number of protons in the nucleus and defines the type of element. In a neutral atom, the number of protons equals the number of electrons, but this atom has 20 electrons, which means it has a +4 charge, making it a chromium ion. Furthermore, it has 28 neutrons, and the mass number of an atom is the sum of its protons and neutrons. This gives the chromium atom in question a mass number of 52 (24 protons + 28 neutrons).

DNA

all I had to do was just think back to middle school when I learned that

I believe the answer is A wind,it's not bio

C. garbage because most garbage is human made

Mendeleev i guess. The answer is C

Answer:   C. Dmitri Mendeleev

Explanation:  Dmitri Mendeleev was the first scientist who initiated the arrangement of elements in the regular pattern which is known as the Periodic table of Elements.

He tried to arrange these elements on the basis of the chemical properties and on the basis of their atomic number.

Atomic number was considered as the basis of the periodic table as it is the most basic and essential property of the elements.

No.

Since Boron is a poor conductor of electricity it is non-reactive. For that case it is still water soluble.  

Not the right answer or confused? Reply to this question for help.

No, it is a poor conductor of electricity

Primary mirror is the bottom right space.

Secondary mirror is the left space.

Eyepiece is the top right space.

Hope this helps.

Answer:

Top box: eye piece.

2nd Box: Primary Mirror

Box closest to the bottom: Secondary Mirror

Explanation:

science

Final answer:

To find the chlorine concentration in the solution, the moles of chlorine from CaCl₂ and MgCl₂ are calculated and summed. The total chlorine mass is then determined and divided by the solution volume in liters, resulting in a concentration of 18.45 g/L.

Explanation:

To calculate the concentration of chlorine in the solution prepared by mixing 2g of CaCl₂, 2g of MgCl₂, and 3g of MnO₂ in a total volume of 150 mL, first, we need to determine the amount of chlorine present in each compound. Calcium chloride (CaCl₂) and magnesium chloride (MgCl₂) each have two moles of chlorine per mole of compound, while manganese dioxide (MnO₂) has no chlorine.

Molar mass of CaCl₂ = 110.98 g/mol

Molar mass of MgCl₂ = 95.21 g/mol

Amount of chlorine from CaCl₂:

• (2 g CaCl₂) / (110.98 g/mol) = 0.01802 mol CaCl₂ × 2 mol Cl⁻/mol = 0.03604 mol Cl⁻

Amount of chlorine from MgCl₂:

• (2 g MgCl₂) / (95.21 g/mol) = 0.02101 mol MgCl₂ × 2 mol Cl⁻/mol = 0.04202 mol Cl⁻

Total moles of Cl⁻ = 0.03604 mol + 0.04202 mol = 0.07806 mol

Finally, to find the concentration of chlorine in g/L:

• (0.07806 mol Cl⁻) × (35.45 g/mol) = 2.767 g of Cl⁻

• Since the total volume is 150 mL, or 0.15 L, the concentration is (2.767 g / 0.15 L) = 18.45 g/L.

In thrust faulting: sedimentary rock is horizontal and undeformed

older rock layers are pushed on top of younger rock layers

extreme pressure changes metamorphic rock into igneous rock

the surface of the earth is raised only slightlysedimentary rock is horizontal and undeformed thats the one

Hope this helped!

Thrust faulting is a form of geological fault that occurs when one section of earth's crust is forced over another, causing rock layers to overlap and creating geological features like mountains. It's associated with the forces of tectonic plate interactions and plays a key role in understanding how the earth's surface has changed over time.

In the earth's crust, thrust faulting is a type of fault in geology that occurs when one slab of the earth's crust is forced up and over another. This movement results in layers of rock being pushed on top of each other, causing significant distortion and upheaval, as well as leading to the creation of various geologic features such as mountains. The process of thrust faulting is often associated with the powerful forces of tectonic plate interactions, particularly at convergent boundary areas where plates are pushing against each other. It's an essential concept in interpreting the earth's complex geological history as it contributes to our understanding of how our planet's surface has changed and evolved over many millions of years.

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Answer:

octahedral

Explanation:

Six bonding pairs around a central atom result in an octahedral. Hence, option D is correct.

Octahedral molecules contain six atoms bonded to the central atom and no lone electron pairs, making the steric number equal to six.

VSEPR theory was first coined by Gillespie and Nyhlom in 1957 as an improvement over the Sidgwick - Powell theory.

According to this theory, the shape of a molecule is determined by the number of electron pairs that surround the valence shell of the central atom in the molecule.  The electron pairs are positioned as far apart in space as possible to minimize the repulsion of electron pairs.

However, the presence of lone pairs distorts the shape anticipated for the molecule on the basis of VSEPR.

For a molecule having six electron pairs, an octahedral geometry is expected(electron domain geometry).

Hence, option D is correct.

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Answer:

second class

Explanation:

In order for a cellular change to be inherited, this change must be present in the male gamete, or sperm or present in  the female gamete, the egg or ovum. This is due to the fact that a baby is created from the fusion of an egg and sperm. Therefore, choice 2,  the deletion of a single DNA base in a sperm cell of a trout, is the correct answer.  

If we think about it logically, cellular changes in other parts of body should not affect the next generation. For example, if mom has skin cancer, it does not mean at all  that the baby will have it as well.

no charge

this is because protons have a charge of 1+ and electrons have a charge of 1- so if there is an equal number of them, their charges cancel each other out and make the atom have a charge of 0, which means no charge

Answer: An atom with an equal number of electrons and protons has no charge

Explanation: The charge of an atom comes from the electrons and protons present. Electrons have a charge of 1- and protons have a charge of 1+. When the number of electrons and of protons are equal, an atom has no overall charge.

starfish , squid , sea turtle are the only ones i know