CHEMISTRY HIGH SCHOOL

Which equivalence factor should you use to convert from 38.2 grams of potassium (K) to moles of potassium? (38.2 g K/39.10 g K) (38.2 g K/1 mol K) (1 mol K/38.2 g K) (1 mol K)/39.10 g K)

Answers

Answer 1
Answer: It will be 1molk/39.10g

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HIGH SCHOOL

For years, surgeons have had great success using _____. A) pig hearts

B) synthesis organs

C) artificial heart valves

D) the artificial heart

Answers

C the artifical heart
C artificial heart valves
HIGH SCHOOL

Which of the following is an example of a combustion reaction? A. Mixing of acid and base
B. Photosynthesis in plants
C. Lighting of a matchstick
D. Reacting sodium and chlorine

Answers

Answer:

Option c = Lighting of matchstick

Explanation:

The lightning of match stick is combustion reaction.  The chemical potassium chlorate, glue, sulfur and starch is present on the tip of match stick. When the match stick catch the fire combustion process occur and heat is released.

Photosynthesis in plant:

It is the reaction in which plants used the carbon dioxide and water and convert it into sugar and oxygen in the presence of light.

6CO₂ + 6H₂O + light → C₆H₁₂O₆ + 6O₂

Mixing of acid and base:

When an acid react with base it form the salt and  water. The reaction is also called neutralization reaction because both neutralize each other.

In neutralization reaction equal amount of acid and base react to neutralize each other and equal amount of water and salt are formed. When pH does not reach to 7 its means there is less amount of one of reactant which is not fully neutralize.

Reacting of sodium and chlorine

The reaction of sodium and chlorine is the formation of  ionic compound. It is formed by the complete transfer of electron from sodium to chlorine atom and form ionic bond. In this ionic compound sodium carry positive charge and chlorine carry negative charge there is attraction between these oppositely charged atoms.

Answer:

lighting of a match stick

Explanation:

COLLEGE

Which has prokaryotic cells

Answers

An organism is said to have a prokaryotic cell if its cell is a very simple one that does not contain any true nucleus and which do not have membrane bound organelles. Prokaryotes are usually unicellular organisms, examples are bacteria. One key feature of prokaryotic cell is a piece of circular, double stranded DNA which is usually found in the cell.

Answer: E.coli

Explanation:

It’s unicellular

COLLEGE

When an oxygen atom is attached to a carbon atom, the carbon atom becomes more _____. acidic

oxidized

reduced

basic

HELP

Answers

Answer:

             When an oxygen atom is attached to a carbon atom, the carbon atom becomes more Oxidized.

Explanation:

                        In chemistry oxidation reduction are defined as,

Oxidation:

                Addition of Oxygen

                Removal of Hydrogen

                Removal of Electrons

Reduction:

                Addition of Hydrogen

                Removal of Oxygen

                Addition of Electrons

Example:

                                CH₄  +  2 O₂    →    CO₂  +  2 H₂O

In above reaction the carbon atom in CH₄ has an oxidation number of -4 as it is bonded to less electronegative atom i.e. Hydrogen while, on product side the oxidation number of Carbon in CO₂ is +4 as it is attached to more electronegative oxygen atom. Hence, the oxidation number has increased from -4 to +4.

Carbon is also oxidized in reference of addition of oxygen and removal of hydrogen as defined above. Therefore, we can say that when an oxygen atom attaches to carbon atom the carbon gets oxidized.

Answer: oxidized

Explanation:

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