CHEMISTRY HIGH SCHOOL

Methanogens usually require Choose one: A. acidic conditions. B. methane as a substrate. C. high temperatures. D. association with bacterial species.

Answers

Answer 1
Answer:

Answer:

D. association with bacterial species.

Explanation:

Methanogens -

These are the organisms , that falls under the category of the prokaryotes , in the domain archaea .

Methanogens are a type of microorganism , which is capable to produce methane as one of the by product during a hypoxic condition .

These organisms are found in the wetland , inside the digestive system of the humans and animals .

They have an important space for the treatment of the anaerobic wastewater .

Hence , from the question ,

The correct option is d.

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In which type of chemical reaction do two or more reactants combine to form one product, only?a. synthesis
b. decomposition
c. single replacement
d. double replacement.

Answers

A chemical reaction is defined as the process in which two more reactants are converted to form one or more different product.

The chemical reaction in which two more reactants combine to form one product is a synthesis reaction.

Synthesis reactions are defined as the reaction in which two different atoms or molecules react to form a different compound. Synthesis reactions are exothermic reactions, such that the reactions release energy in the form of heat and light.

One of the most common examples of a synthesis reaction is the formation of sodium chloride. It can be expressed as:

Na (Sodium) + Cl (Chlorine) \rightarrowNaCl (Sodium Chloride)

Thus, the synthesis reaction will result in one different compound or product.

The correct answer is Option A.

To know more about synthesis reaction, refer to the following link:

brainly.com/question/24936069
Synthesis is when multiple reactants come together to form one. Decomposition is when one reactant breaks down to form multiple products which are either elements or compounds. Single replacement is when there is an element and a compound and the element switch spots with the other element( metal switch with metal, nonmental with nonmetal, vice versa). The element has to be more reactive than the like element in the compound in order for it to be able to switch. Use the reactivity series to help you with this. Double Replacement is when you have two compounds and like elements switch places.

25 Which of the following is a correct statement describing photosynthesis?

Plants make glucose and oxygen by taking in carbon dioxide and water.
Plants take in oxygen and carbon dioxide to make glucose and water.
Plants take in oxygen and water to make carbon dioxide and glucose.
Plants take in glucose and carbon dioxide to make water and oxygen.

26

Under what condition will a marshmallow and a rock fall at the same speed?

In the water
The marshmallow must be thrown down with greater force
This can never happen, because of the different masses
In a vacuum

27

Which of the following would exert about 1000 Newtons of force?

A baby
A large man
A safety pin
A dump truck

Answers

25: A) Plants make glucose and oxygen by taking in carbon dioxide and water. 
26: D) In a vacuum
27: B) A large man (1000 newtons is approximately 224 lbs of force)

If you are performing a stoichiometry problem and the only information you have to start is the molarity and volume of a solution used, what would you do?

Answers

Answer:

If you are performing a stoichiometry problem and the only information you have to start is the molarity and volume of a solution used, then one would multiply the molarity and volume to find moles.

Explanation:

In a stoichiometry problem, we multiply the molarity and volume to find moles,  balance the chemical equation, find the mole ratio, calculate the moles of either the product formed or the reactant consumed in the reaction, and if required convert moles to grams.

 It might be the best answer: multiply the molarity by the volume (in liters) to find moles

Concentrated nitric acid used in laboratory is 68 % nitric acid by mass in aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.504 g mL-1?

Answers

68% by mass = 68 / 100 => 0.68

Density = 1.504 g/mL⁻¹

Molar mass HNO₃ =63.01 g/mol

M = 1000 * T* D / mm

M = 1000 * 0.68 * 1.504 / 63.01

M = 1022.72 / 63.01

M = 16.23 mol/L

hope this helps!

What are transferred in an oxidation-reduction reaction

Answers

hydrogen atoms or electrons

Answer:

C. Electrons

Explanation:

Which element has atoms that can bond with each other to form long chains or rings?(1) carbon (3) oxygen
(2) nitrogen (4) fluorine

Answers

The correct answer is option 1. It is the carbon (C) atom that can bond with each other to form ring and chain structures in compounds. These ring and chain structures and compounds are called organic compounds. Chain structures include alkanes, alkenes, alkynes. Ring structures include cyclic hydrocarbons and aromatic hydrocarbons.

Answer: Option (1) is the correct answer.

Explanation:

Carbon atoms are able to combine with its atoms resulting in formation of long chains. This property of carbon is known as catenation. Whereas carbon atom also has the property to combine with other atoms and results in the formation of long chains or rings.

On the other hand, oxygen, nitrogen, and fluorine does not form long chains or rings.

Thus, we can conclude that carbon is the element whose atoms can bond with each other to form long chains or rings.
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