CHEMISTRY HIGH SCHOOL

In the compound KHSO4, there is an ionic bond between the1) KH+ and SO42– ions
2) KHSO3+ and O2– ions
3) K+ and HS– ions
4) K+ and HSO4– ions.

Answers

Answer 1
Answer:

In the compound KHSO4, there is an ionic bond between the K+ and HSO4– ions.

Ionic bond is a type of bond that is formed between metals and non metals. During the reaction, metals usually donate electron[s] to non metals. The metals thus become positively charged while the non metals become negatively charged. Therefore, ionic compound are usually composed of charged particles. For the ionic compound given above, the charged particles in the compound are K+ and HSO4- ions.

Answer 2
Answer: 4) K+ and HSO₄⁻
potassium ion react with  Hydrogen Sulfate ion

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The atoms of a certain material can absorb red and blue light frequencies. What happens to yellow light that shines on it? It is absorbed.
It is reflected.
It is transmitted.
It is either reflected or transmitted.

Answers

Answer: It is either reflected or transmitted.

Explanation:

The color of the objects is due to the light reflected to our eyes.The light falls on the surface of the object and the color which does not get absorbed by the object gets transmitted or reflected and thus appear to be of the same color as the reflected or transmitted light.

Example:  If an object absorbs all of the frequencies of visible light except for the frequency associated with green light, then the object will appear green in color.
It is reflected ir transmitted depending on what the material is. The color that something appears is actually the color that it reflects or transmits and not the color that it absorbs. I hope this helps.

Which pair are classified as chemical substances? Pick two.elements, mixtures, compounds, solutions.

Answers

Elements and compounds. This is because in solutions and mixtures the substances are not bonded to each other or pure, you can separate and purify substances in solutions and mixtures (via techniques such as distillation, filtering) but you cannot separate compounds as they are bonded together.

Final answer:

In chemistry, elements and compounds are classified as chemical substances. Elements are substances composed of identical atoms, whereas compounds are substances formed from chemically bonded elements.

Explanation:

In the world of chemistry, both elements and compounds are classified as chemical substances. An element is a substance composed of identical atoms, such as hydrogen or iron. A compound, on the other hand, is a substance formed when two or more elements are chemically bonded together, like water (H2O) or carbon dioxide (CO2). It's important to distinguish these from mixtures and solutions, which can contain multiple substances but aren't chemically bonded, therefore, they are not considered chemical substances in the strict sense.

Learn more about Chemical Substances here:

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Which list of radioisotopes contains an alpha emitter, a beta emitter, and a positron emitter?(1) C-14, N-16, P-32
(2) Cs-137, Fr-220, Tc-99
(3) Kr-85, Ne-19, Rn-222
(4) Pu-239, Th-232, U-238

Answers

Answer: The correct option is 3.

Explanation: Radioisotopes which emits alpha-particle are known as alpha-emitters. These radioisotopesundergo alpha-decay.

The radioisotopes which emits beta-particle (_(-1)^0\beta ) are known as beta-emitters. These radioisotopes undergo beta-minus decay. In this decay a neutron gets converted to a proton and an electron.

The radioisotopes which emits positron-particle (_(+1)^0\beta ) are known as positron-emitters. These radioisotopes undergo beta-plus decay. In this type of decay a proton gets converted to a neutron.

From the given options,

Option 1: All the three radioisotopes undergoes beta-minus decay.

Option 2: Cs-137 and Tc-99 radioisotopes undergo beta-minus decay.

Fr-220 is a radioisotope which undergoes alpha-decay.

Option 3: Radioisotope Kr-85 undergoes beta-minus decay.

_(36)^(85)\textrm{Kr}\rightarrow _(37)^(85)\textrm{Rb}+_(-1)^0\beta

Radioisotope Ne-19 undergoes positron decay.

_(10)^(19)\textrm{Ne}\rightarrow _(9)^(19)\textrm{F}+_(+1)^0\beta

Radioisotope Rn-222 undergoes alpha decay.

_(86)^(222)\textrm{Rn}\rightarrow _(84)^(218)\textrm{Po}+_(2)^4\alpha

Option 4: All the three radioisotopes undergoes beta-minus decay processes.

Hence, from the above information, the correct option is 3.
The answer is (3), they are β-, β+ and α decay mode. For (1), they are β-, β- and β- decay mode. For (2), they are β-, α and β-. For (4), they are α, α and α decay mode.

Which best explains why blood is considered to be a suspension?A)It has nutrients that cannot be dissolved
b)It contains particles that can settle out.
C)It has nutrients that are dissolved in its liquid portion.
D)It contains particles that mix on a molecular level.

Answers

I think the best answer is b): it contains particles that can settle out.

The definition of suspension is a heterogeneous (that is same in all parts) mixture that contains particles that could undergo sedimentation (settle down) - this definition is close to b). It should not matter whether those particles are nutrients( so A or C are not good answers).


Answer:

I think the best answer is b

Explanation:

I think the best answer is b

Do all substances have the same melting point and boiling point as water?? (i think this can be answered from the particle theory!!)

Answers

They cannot, because then at room temperature metals would not be solid. THey would be in a liquid state.

What intramolecular forces exist in methyl alcohol?

Answers

There are hydrogen bonds inside -- they are the strongest.
What's more there are dipole-dipole forces.
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