CHEMISTRY HIGH SCHOOL

The decayed organic material that gives soil its dark brown or black color is calledA) clay.
B) humus.
Eliminate
C) loam.
D) silt.

Answers

Answer 1
Answer: Option B. Humus. Its dark color is due to the high content of carbon.
Answer 2
Answer:

Answer:

Answer is Humus

Explanation:

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Which of the following about sodium atoms(Na) is NOT correct?1. All neutral sodium atoms have 11 protonsand 11 electrons.2. All sodium atoms have the atomic number11.3. All sodium atoms have the same numberof protons.4. All sodium atoms have 11 neutrons.5. All atoms with atomic number 11 aresodium atoms.
All fossil fuels contain this element. iron hydrogen copper magnesium
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Which statement describes a chemical property of the element magnesium?(1) Magnesium is malleable.(2) Magnesium conducts electricity.(3) Magnesium reacts with an acid.(4) Magnesium has a high boiling point.

Which statement best explains the change that occurs when gas particles move more slowly

Answers

Answer:

Condensation/Sublimation

Explanation:

When gas particles move more slowly they're losing energy, which means it's changing state to either a solid or liquid.

Answer:

C) The temperature decreases because the average kinetic energy decreases.

Explanation:

EDGE 2022

Select the correct answer. Which statement describes the acid found in vinegar (acetic acid)? A. It tastes bitter. B. It feels slippery. C. It changes red litmus paper to blue. D. It reacts with Mg to produce H2. E. It releases OH- in a solution.

Answers

Answer: Option (D) is the correct answer.

Explanation:

The acetic acid, (CH_(3)COOH) present in vinegar reacts wit magnesium and therefore, it releases hydrogen gas and magnesium acetate.

The chemical reaction will be as follows.

       2CH_(3)COOH + 2Mg \rightarrow 2Mg(CH_(3)COO) + H_(2)

An acid is a substance which has pH less than 7 and changes blue litmus red. Acids taste sour as they are acidic in nature and releases hydrogen ions.

Whereas bases have pH greater than 7 and changes red litmus into blue.Bases taste bitter and releases hydroxide ions.

Thus, we can conclude that the statement it reacts with Mg to produce H_(2) best describes the acid found in vinegar (acetic acid).

Answer:

D. It reacts with Mg to produce H2.

______________ is a durable metal and is widely used for casting, which is a process by which melted metal is poured into a mold.a. Bronze
c. Copper
b. Silver
d. Gold Please select the best answer from the choices provided A B C D

Answers

The best answer is (c.) Copper. Copper is the durable metal that is widely used for casting, which is a process by which melted metal is poured into a mold. Copper is one of the common metal that is used and other material may include tin, zinc, aluminum and magnesium.

Answer:

c

Explanation:

did quiz

Some isotopes of elements are unstable and decay into other, more stable isotopes over time. for example, it takes 153 years for half of a sample of silicon (si) atoms with 14 protons, 14 electrons, and 18 neutrons to decay. what is the name of this specific silicon isotope.a. silicon-14
b. silicon-32
c. silicon-46
d. silicon-153

Answers

The correct answer is option a, silicon-14

Number of electrons = 14

Number of protons = 14

Number of neutrons = 18

Since atomic number is equal to the number of protons, the atomic number of this specific silicon isotope is 14.

Also, mass number is equal to number of protons and number of neutrons. So mass number so this specific silicon isotope is 14 + 18 = 32

The name of this specific silicon isotope is silicon-14.

Silicon-14 is represented as ³²Si₁₄

Please show step by step and I will mark you as brainliest answer ❤️​

Answers

Answer: The pH of the solution is 13.

Explanation:

pOH is defined as the negative logarithm of hydroxide ion concentration present in the solution.

pOH=-\log [OH^-]

We are given:

Concentration of Ca(OH)_2=0.05mol/dm^3=0.5mol/L          (Conversion factor: 1L = 1dm^3 )

1 mole of calcium hydroxide produces 1 mole of calcium ions and 2 moles of hydroxide ions

Concentration of OH^-=(2* 0.05)=0.1mol/L

Putting values in above equation, we get:

pOH=-\log (0.1)\n\npOH=1

We know:

pH+pOH=14\n\npH=14-1\n\npH=13

Hence, the pH of the solution is 13.

Which of the following characteristics do all plants share?a. being unicellular
b. producing flowers
c. being a prokaryote
d. being an autotroph

Answers

The correct option is d. being an autotroph. All plants are multicellular eukaryotes that produce their food through the process of photosynthesis.

What are autotroph ?

Autotrophs are organisms that are capable of producing their own food using energy from the environment, such as sunlight or chemicals. They are also known as "producers" in ecosystems because they are able to synthesize organic molecules from simple inorganic substances.

Plants are one of the most well-known examples of autotrophs, as they use energy from sunlight to produce their own food through photosynthesis.

Not all plants produce flowers, as there are some plant groups that do not produce flowers such as ferns and mosses. Additionally, plants are not unicellular as they are made up of many cells. Finally, plants are not prokaryotes, as they have complex cells with a nucleus and other organelles.

Hence, option d is correct.

Find more on autotrophs:

brainly.com/question/11209881

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It would be C because ALL plants are prokaryotes. A is wrong because some plants can be multicellular. B is wrong because not all plants produce flowers. D is wrong because if plants were autotrophs, they would have to eat something to get energy, but plants get energy from the sun.
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