The element ___ is always present in a combustion reaction

Answer:

Option (A)

Explanation:

The asthenosphere is the upper part of the mantle and this region is just below the lithosphere. The lithospheric plates are divided into 2 types, namely the continental crust and the oceanic crust. These plates moves over this layer of asthenosphere due to the generation of the convection current in the mantle. This currents also forces the asthenosphere to move considerably at a slower rate. This convection current is formed due to the heat radiated from the core (interior) of the earth. The core of the earth is comprised of the denser and molten rocks such as iron and nickel. The rocks in the asthenosphere are solid in nature, but they have the ability to move during deformation.

Hence, the correct answer is option (A).

Answer:

In 1966, Dr. Hoffmann recorded for the first time in medicine embryonic movements and the heartbeat of the fetus using an ultrasound system.

Explanation:

Today, ultrasound is a technique widely used by many medical specialties, in the emergency department, in intensive care or in daily practice.

In 1794, the Italian Spallanzani observed that during the flight of bats they did not collide with anything despite being blind. It is then that he theorizes that they emitted sounds imperceptible to the man he would call ultrasounds, which they capture with their ears after bouncing off objects.

In 1842, Christian Doppler's first article on the effect of his name appears.

In 1912, Richardson suggests the use of ultrasonic echoes to detect submerged objects, creating the first ultrasonic generator five years later by Paul Langevin and Chilowsky.

Since then the applications of this new technology have been unstoppable, especially in medicine.

Final answer:

Dr. Hoffmann's ultrasound device is used for both diagnostic imaging, such as fetal monitoring, at high frequency, and therapeutic treatments, such as tumor destruction, at lower frequency, providing non-invasive, safe, and effective medical care.

Explanation:

Dr. Hoffmann's ultrasound device provides significant benefits to society, particularly in the fields of medicine and healthcare. Ultrasound technology operates on the principle of using high-frequency sound waves to create images or induce therapeutic effects within the human body. For diagnostic purposes, such as observing a fetus in the womb, ultrasound imaging tends to use higher frequencies ranging from 5-20 MHz because higher frequencies produce more detailed images, which are essential for accurate monitoring and diagnostics.

Meanwhile, for therapeutic applications, such as destroying cancerous tumors, lower frequencies of 1-3 MHz can generate sufficient heat to damage and destroy tumor cells without harming surrounding tissues, offering a non-invasive treatment option.

These medical applications of ultrasound are just two examples of how this technology has revolutionized healthcare, making it possible to diagnose and treat patients safely, effectively, and without invasive surgical procedures. Moreover, the development and improvement of ultrasound devices contribute to ongoing research and the discovery of even more applications in various fields beyond medicine.

C.  Cu undergoes reduction.

Answer: C.) Cu undergoes reduction.

Explanation:

[tex]Fe(s)+CuSO_4(aq)\rightarrow FeSO_4(aq)+Cu(s)[/tex]

I)  Oxidation reaction : involves loss of electrons and there is an increase in oxidation state number.

[tex]Fe\rightarrow Fe^{2+}+2e^-[/tex]

Fe metal has undergone oxidation, as its oxidation state is changing from 0 to +2 in [tex]FeSO_4[/tex].

ii) Reduction reaction : involves gain of electrons and there is a decrease in oxidation state number.

[tex]Cu^{2+}+2e^-\rightarrow Cu[/tex]

Copper(II) ion has undergone reduction, as its oxidation state is changing from 2+ to 0. Copper ions are getting converted into copper metal.

The correct answer is Seafloor Spreading

Give me brainliest if it is correct!

Answer: ice cubes, paper

Explanation:

Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: Iron [tex]Fe[/tex], Aluminium [tex]Al[/tex]

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions.

Example: ice cubes [tex]H_2O[/tex] , paper which is made of cellulose [tex]C_6H_{10}O_5)_n[/tex]

Thus ice cubes and paper are compounds.

Answer:

d. They are defined by their different physical features.

Explanation:

Horizons is the term used to designate the layers that make up the soil. Each layer receives a letter as identification and has different characteristics. Each shift was formed by the weathering process, which occurs due to the influence of factors, chemical, physical and biological.

As previously mentioned, each layer has different characteristics from each other, which allow a wide interpretation of the soil. These characteristics are physical grades such as color, texture, clay content, viscosity, etc.

For this reason, we can say that the horizon is defined by its different physical characteristics.

Answer is: C. Water can dissociate many ionic compounds through ion-dipole interactions.

For example, dissociation of potassium bromide: KBr(aq) → K⁺(aq) + Br⁻(aq).

Some ionic compounds cannot dissociate in water, for example calcium sulfate (CaSO₄), silver chloride (AgCl), lead(II)-carbonate (PbCO₃).

An ion-dipole is electrostatic interaction between a charged ion (cations and anions) and a molecule that has a dipole (in this example water).

Dipole is a separation of positive and negative charges. In water, hydrogen has positive and oxygen has negative charge.

Answer:

The answer is of course, D

Explanation:

For example, since potassium (K) is a metal and chlorine (Cl) is a nonmetal, if these two elements combine, they will form an ionic bond. If carbon (C), a nonmetal, and oxygen (O), a nonmetal, combine, they will form a covalent bond.

The theoretical yield of carbon dioxide can be calculated using the stoichiometric ratio in the balanced equation for the reaction. It is the amount of product that would be obtained if all reactants were completely converted to product under ideal conditions. The theoretical yield can be calculated by multiplying the amount of the starting reactant by the stoichiometric ratio in the balanced equation.

Theoretical yield is the amount of product that would be obtained from a chemical reaction if the reaction proceeded perfectly and all reactants were completely converted to product. In this case, the balanced equation shows that 1 mole of H3C6H5O7 reacts with 3 moles of NaHCO3 to produce 3 moles of CO2. Therefore, the theoretical yield of carbon dioxide would be 3 times the amount of H3C6H5O7 given.

Example: If 2 moles of H3C6H5O7 are given, the theoretical yield of CO2 would be 3 x 2 = 6 moles.

Note that the theoretical yield assumes ideal conditions and perfect conversion, so the actual yield may be less due to factors like incomplete reactions or side reactions.

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The correct pairing of a chemical name with its formula from the given options is 2.N2O5, which is named dinotrogen pentoxide.

Of the given options, 2.N2O5 dinotrogen pentoxide is correctly paired with its name. The chemical name for MgCl2 is magnesium chloride, not magnesium dichloride. Similarly, H20 should be written as H2O and it is correctly named water or dihydrogen monoxide, not hydrogen oxide. Lastly, CuCl2 is copper (II) chloride, not copper (III) chloride, because copper in this compound has a +2 oxidation state, not +3.

To calculate the molar mass of sulfuric acid (H2SO4), sum the molar masses of hydrogen, sulfur, and oxygen based on their respective quantities, yielding a molar mass of 98.09 g/mol.

To calculate the molar mass of sulfuric acid (H2SO4), you need to sum the molar masses of all the atoms in a molecule of H2SO4. Each atom's molar mass is found on the periodic table: hydrogen (H) has a molar mass of approximately 1.01 g/mol, sulfur (S) has a molar mass of approximately 32.07 g/mol, and oxygen (O) has a molar mass of approximately 16.00 g/mol.

Using these values, you can perform the following calculation:

Add these values together to get the total molar mass of H2SO4:

Molar mass = 2.02 g/mol + 32.07 g/mol + 64.00 g/mol = 98.09 g/mol

This is the molar mass for sulfuric acid, which is essential for various calculations in chemistry, such as determining the number of moles in a given sample or calculating the concentration of solutions.

Answer:

The isotope must have 31 electrons

Explanation:

Answer:

If you are in k12 then I think the answer you are looking for is 6

Answer : The number of neutrons in an atom U-233 is, 141 neutrons.

Explanation :

The given atom is, U-233

The atomic mass number of U = 233

The atomic number of U = 92          (from the periodic table)

Now we have to determine the number of neutrons in U-233.

Number of neutrons = Atomic mass number - Atomic number

Number of neutrons = 233 - 92 = 141

Therefore, the number of neutrons in an atom U-233 is, 141 neutrons

Answer: Amino acid

Explanation:

Amino acid is a monomer that combines together to form a polymer known as protein. Two or more than two amino acids combine to form a protein.

The amino acids are joined together by peptide bond. Amino acids are the most important and basic components of life that performs the vital functions of the body.