CHEMISTRY HIGH SCHOOL

Based on the law of Conservation of Mass, what happens to the mass of a substance in a chemical change? A: the mass is always conserved B: The mass is either created or destroyed C: the reactant always has more mass D: the product always has more mass

Answers

Answer 1
Answer:

Answer:

A.

Explanation:

The amount of mass always stays the same, matter cannot be created nor destroyed, it can only change forms. Thus, the answer is A.  
Answer 2
Answer:

In a chemical reaction the total mass of all the substances taking part in the reaction remains the same. Also, the number of atoms in a reaction remains the same. Mass cannot be created or destroyed in a chemical reaction.

I hope this helps..

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6 CO2 + 6 H2O + Energy--> C6H12O6 + 6 O2 is the chemical formula for:A: abiogenesis
B: Respiration
C: Photosynthesis
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Answers

This would be the formula representing the process of C. Photosynthesis.

Answer:

C. photosynthesis

Explanation:

Which element is found in nature only in compounds? A. sodium B. helium C. oxygen D. nitrogen

Answers

Answer: Option (A) is the correct answer.

Explanation:

A compound is a substance which contains two or more different atoms combined together.

Sodium is found as sodium chloride in nature. Sodium chloride is also known as common salt.

As it contains a sodium atom combined to a chlorine atom, therefore, it is a compound.

Thus, we can conclude that sodium is the element that is found in nature only in compounds.
The element found in nature only in compounds is Sodium

which of the following types of electromagnetic radiation is most dangerous? 1) Gamma Radiation 2) Ultraviolet Radiation

Answers

Gamma radiation is the most dangerous.

Unsaturated hydrocarbons react very slowly with bromine. true false

Answers

False.Alkenes or alkynes (unsaturated hydrocarbons) are susceptible toelectrophilic attack by electrophiles, resulting in electrophilicaddition reactions.

ZnS has two common polymorphs: Sphalerite and Wurtzite. Based on the analysis of Medelung constants alone, predict which polymorph should be more stable. Assume that the Zn-S distances in the two polymorphs are identical.

Answers

Answer:

Wurzite has a higher Madelung constant when compared with Sphalerite therefore Wurizite is more stable.

Explanation:

Zinc Sulphide is a chemical compound that exhibits polymorphism. This means Zinc Sulphide can exists in different forms as a compound. Zinc Sulphide has two common polymorphs named; Wurtzite and Sphalerite .

This two polymorphs are crystalline in structure. Wurtzite is hexagonal in shape while Sphalerite is cubic in shape.

Madelung constant was named after German Physicist Erwin Madelung. Madelung constant is dependent on the the way ions are arranged in a solid substance or molecule. It is used to calculate the amount of energy required to move an ion from one point to the another in a crystal substance.

Madelung constant for Wurtzite is 1.64132 and for Sphalerite is 1.63806. Due to the fact that Wurtzite has a slightly higher Madelung constant that Sphalerite, it tends to be more stable than Sphalerite.

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1.Compare and contrast the rate of solution formation between the three physical forms of salt that were placed in the vial and not agitated with the three forms of salt that were placed in the vial and were agitated.2. On the basis of your results, what is the relationship between the temperature of the solvent and the rate of solution formation?
3. Use your knowledge of collision theory to explain the results of your experiments in this laboratory.

Answers

Thestable form of salt at standard temperature and pressure is solid. If you addwater to salt, it will dissolve. However, there are certain factors that affectthe rate of solution formation of salt. The rate of formation of salt solutionis faster when the vial is agitated than when it is not agitated. By agitatingthe solution, you are increasing the surface area of the salt particles incontact with water.

Answer:

answer for number 2

Explanation:

By increasing the temperature of the solvent, the movement of molecules sped up resulting in the more movement of particles and they bump into each other more vigorously. As a result of that, the particles of the solute break faster and dissolve in the solvent faster .
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