Answer:
Though soil pH generally ranges from 1 to 14, the optimum range for most agricultural crops is between 5.5 and 7.5. However, some crops have adapted to thrive at soil pH values outside this optimum range.
Answer:
okkodijhmnchnffc
Explanation:
PLEASE HELP! CHEMISTRY!
Solution A has a pH of 2.0. Solution B has a pH of 5.0. Which solution is more acidic? Based on the H+ ion concentrations in the two solutions, how many times more acidic?
Answer:
solution A
Explanation:
it is because solution A has a pH of 2.0 and solution B has the pH of 5.0 and also whose number is greater than the solution A .That is why it is acidic
For the equation below, write the oxidation half-reaction and the reduction half-reaction. 2Na + Cl2 -----> 2NaCl
Answer:
Oxidation half-reaction : Na(s) → Na⁺ + 1 e-
Reduction half-reaction: Cl₂ + 2 e- → 2 Cl⁻
Explanation:
Oxidation half-reaction: solid sodium (Na(s)) has an oxidation number of 0. It loses 1 electron and forms the cation Na⁺. So, the half-reaction is the following:
Na(s) → Na⁺ + 1 e-
Reduction half-reaction: chlorine gas (Cl₂) has an oxidation number of 0. Each atom of Cl gains 1 electron to form two Cl⁻ ions, according to the following half-reaction:
Cl₂ + 2 e- → 2 Cl⁻
The total oxidation-reduction reaction is obtained by adding the oxidation half-reaction multiplied by 2 (to balance the electrons) and the reduction half-reaction, as follows:
2 x (Na(s) → Na⁺ + 1 e-)
Cl₂ + 2 e- → 2 Cl⁻
--------------------------------
2Na(s) + Cl₂ → 2NaCl
What type of particle has no electrical charge? A. proton B. neutron C. electron D. nucleus
Answer:
B
Explanation:
Neutron, neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen. It has no electric charge and a rest mass equal to 1.67493 × 10−27 kg—marginally greater than that of the proton but nearly 1,839 times greater than that of the electron.
What do cuticles do for land plants that was not necessary for ancestors that lived in water?
Answer:
What do cuticles do for land plants that was not necessary for ancestors that lived in water? Cuticles help prevent water loss. ... The next groups of land plants to evolve were ferns, which could grow bigger and taller because they could transport water and food.
Explanation:
What is the name of this molecule?
Η Η
H-C=C-C-C-H
H H
A. 3-butyne
B. 4-butyne
C. 2-butyne
O D. 1-butyne
D. 1-butyne.
The name of this molecule is 1-butyne.
The name of this molecule is 1-butyne. D is correct.
What is IUPAC nomenclature?IUPAC nomenclature of organic chemistry is a method of naming organic chemical compounds as given by the International Union of Pure and Applied Chemistry (IUPAC).
There are 3 main parts of IUPAC nomenclature -
1. Prefix
2. Root word
3. Suffix
We have to select the longest continuous chain in a compound and give prefixes as the substituents. Root word will the part which depends on no. of carbon atoms such as meth or eth. And in suffix we focus on type of carbon chain whether it is saturated or not and also the functional group.
Here, we can say that the numbering will be started from the carbon having triple bond and it is present at first position.
Therefore, The name of this molecule is 1-butyne. D is correct.
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how do you calculate molecular weight
Answer:
Using the periodic table of the elements to find atomic weights, we find that hydrogen has an atomic weight of 1, and oxygen's is 16. In order to calculate the molecular weight of one water molecule, we add the contributions from each atom; that is, 2(1) + 1(16) = 18 grams/mole.
Write any 4 reactions of compounds or element with water.
Answer:
A common characteristic of most Alkali Metals is their ability to displace H2(g) from water. This is represented by their large, negative electrode potentials. In this event, the Group 1 metal is oxidized to its metal ion and water is reduced to form hydrogen gas and hydroxide ions. The general reaction of an alkali metal (M) with H2O (l) is given in the following equation:2M(s)+2H2O(l)⟶2M+(aq)+2OH−(aq)+H2(g)(1)
Explanation:
How many molecules of Na2O are in 24.6g? Show work!
Answer:
Explanation:
Na2O has 2 atoms of Sodium and 1 atom of Oxygen
So, the molecular mass of Na2O is:
(2 x Atomic weight of Na) + (1 x Atomic weight of O)
Atomic weight of Na = 22.99 g
Atomic weight of O = 16 g
Therefore, Molecular Mass of Na2O = (2x 22.99g) + (1 x 16g)
= (45.98 + 16)g = 61.98 g
Therefore 61.98 g of Na2O contains 6 x 10^23 molecules (Avogadro's number).
24.6 g of Na2O therefore contains:
(24.6/61.98) x 6 x 10^23 = Answer!
Will chlorine displace bromine from a solution of potassium bromide? Explain your answer
Answer:
When chlorine water is added to potassium bromide solution, chlorine will displace the bromine from the salt solution. The chlorine will be REDUCED (gain electrons) to chlorine ions. The bromide ions will be OXIDISED (lose electrons) to become bromine. The bromine will turn the solution orange.
Explanation:
HAVE A GOOD DAY
What does RNA code for
A) DNA
B) fats
C) carbohydrates
D) proteins
Answer:
A. DNA
Explanation:
"carries the genetic information copied from DNA in the form of a series of three-base code “words,” each of which specifies a particular amino acid." ~NCBI
A substance originally has a volume of 4.7 L at 300. K. It is then transferred
into a container with a volume of 3.0 L. What is the new temp for the new
volume?
450 K
350 K
190 K
250 K
Please help thank you
Answer:
C. The hand shears because their shorter handles transfer force more quickly to the cutting blade.
Explanation:
An unknown gas shows a density of 3 g per litre at
273°C and 1140 mm Hg pressure. What is the gram
molecular mass of this gas ?
Answer:
Mass of 1 litre of this gas at 273 degree Celsius and 1140 mm Hg pressure is
3 grams. So, (T1) = (273 + 273) degree Absolute = 546 degree Absolute and
(P1) = (760 + 1140) mm Hg = 1900 mm Hg and (V1) = 1 Litre
First, we have to find out how much volume does it occupy at NTP; (T2) = 273 degree Absolute and (P2) = 760 mm Hg.
So, (V2) = (1900*1 / 546)*(273 / 760) = 1.25 litre.
So, the mass of 1.25 litre volume of this gas = 3 grams
Therefore, the mass of 22.4 litre volume of this gas = (3*22.4 / 1.25) grams
= 53.76 grams.
So, the gram molecular mass of the gas is 53.76.
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PLEASE HELP ME PLEASEEEE if you could just answer one of these questions that would be amazing!
Which would require less energy, moving two particles of the same charge together, or moving two particles of opposite charge close together? Why? (Explain)
Answer:
Moving two particles of the opposite charge close together.
Explanation:
Think about it.
Opposites attract.
When you attempt to move particles with the same charges, a force is created.
Read the given expression.
Effective nuclear charge = atomic number - x
Which of the following explains the identity of X and its trends across a period? (5 points)
X is the screening constant, and it increases across a period.
X is the screening constant, and it remains constant across a period.
X is the number of outermost electrons, and it increases across a period.
X is the number of outermost electrons, and it remains constant across a period.
Answer:
Option 2: X is the screening constant, & it remains constant across a period.
Explanation:
I took the test and got the question correct :)
As we move across the period, X is the screening constant, and it remains constant across a period.
As we move across the period, the size of atoms become smaller because of an increase in the size of the nuclear charge. This leads to a decrease in atomic radius.
As the size of atom decreases, the screening effect on the outermost electron decreases accordingly. Hence, as we move across the period, X is the screening constant, and it remains constant across a period. This is because, no new shells are added across the period.
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During a chemical reaction, some substances are completely consumed while others my not be. What is the substance that is completely consumed in a chemical reaction?
1. A limiting reactant
2. Product
3. Reactant
The substance which completely consumed in a chemical reaction are known as Limiting reagents. Hence, option (1) is the correct option.
What is Limiting reaction ?It is the reactant in a chemical reaction that gets consumed first in a chemical reaction and therefore limits how much product can be formed, Thus, known as Limiting reagent.
Hence, The substance which completely consumed in a chemical reaction are known as Limiting reagents. Hence, option (1) is the correct option.
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How many moles are in 9 grams of water
During the heating of naphthalene, CH:
(a) Why is naphthalene, CH not heated directly using the Bunsen burner?
Answer:
naphthalene aka mothball sublimes
The molecules of a substance formed a rigid repeating crystal structure. Then, a phase change occurred. That structure is now more like clusters of molecules moving past one another. What phase change caused this change?
A
condensing
B
evaporating
C
freezing
D
melting
Answer:
a
Explanation:
The molecules of a substance formed a rigid repeating crystal structure. Then, a phase change occurred. That structure is now more like clusters of molecules moving past one another this change is caused by condensing phase.
What is condensing phase ?The transformation of water vapor into liquid is known as condensation. The process is the opposite of evaporation, in which liquid water turns into a vapor. Either the air is chilled to its dew point or it gets too saturated with water vapor to retain any more water, causing condensation to occur.
By removing and transferring heat from the vapor to a cooling medium, condensation is the process by which a substance goes from its vapor phase to its liquid phase. The vapor must be saturated for the process to begin as well as having its vaporization heat reduced.
Thus, option A is correct.
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The word “covalent” can be broken into two parts: “co” and “valent.” The “co” part means
“together.” To what does the “valent” part refer?
A. Outer electrons
B. Atoms
C. Protons
D. Nuclei
E. Inner electrons
Answer:
Outer electrons.
Explanation:
All bonds are localized bonds formed between two atoms by the donation of electrons from each atom.
Which of the following contains the most atoms?
2 moles of silver.
1 mole of carbon.
2.5 moles of oxygen.
1.5 moles of iron.
PLZZZZZ BE FAST!
Answer:
1 mole of carbon.
Explanation:
Which is a gas that is NOT as damaging to the ozone layer as the others?
halon
CFCs
HFCs
HCFCs
Some species of animals, including some salamanders and crickets, spend their entire lives deep in caves where no sunlight reaches. Predict the main source of energy for these organisms.
Answer:
water
Explanation:
the reason I think water is because water is probably the only source of nutrients which breaks down to energy
HELPPPPP A pearlfish spends the day inside the alimentary tract, or intestines, of a sea cucumber. The fish emerges from the sea cucumber at night to feed on small crustaceans. The pearlfish gets a safe place to live. The sea cucumber does not gain anything from the relationship, nor is it harmed. This is similar to the relationship between which of the following organisms?
A) Fox and bunnies, and lions and zebras.
B) Tapeworms in the gut of animals, and lice on the head of humans.
C) The barnacles that attach on whales and the shuckerfish that travel together with sharks.
D) Bees and plants or sea anemonies and clownfish.
Answer:
D) Bees and plants or sea anemonies and clownfish.
i think..
Explanation:
A pearlfish spends the day inside the alimentary tract, or intestines, of a sea cucumber. The fish emerges from the sea cucumber at night to feed on small crustaceans. The pearlfish gets a safe place to live. The sea cucumber does not gain anything from the relationship, nor is it harmed. This is similar to the relationship between bees and plants or sea anemonies and clownship and the correct option is option D.
What is symbiosis?Symbiosis is a close relationship between two species in which at least one species benefits.
For the other species, the relationship may be positive, negative, or neutral.
There are three basic types of symbiosis: mutualism, commensalism, and parasitism.
Mutualism is a symbiotic relationship in which both species benefit. Commensalism is a symbiotic relationship in which one species benefits while the other species is not affected.
One species typically uses the other for a purpose other than food. Parasitism is a symbiotic relationship in which one species (the parasite) benefits while the other species (the host) is harmed.
Therefore, a pearlfish spends the day inside the alimentary tract, or intestines, of a sea cucumber. The fish emerges from the sea cucumber at night to feed on small crustaceans. The pearlfish gets a safe place to live. The sea cucumber does not gain anything from the relationship, nor is it harmed. This is similar to the relationship between bees and plants or sea anemonies and clownship and the correct option is option D.
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What happens to the salinity and temperature of ocean water as the depth increases?
A. The salinity and temperature of ocean water remain the same as depth increases.
B. The salinity and temperature of ocean water increase as the depth increases.
C. The salinity of ocean water decreases and the temperature of ocean water increases as the depth increases.
D. The salinity of ocean water increases and the temperature of ocean water decreases as the depth increases.
Answer: D
Explanation:
I would say D, because it makes sense for the temperature to decrease with depth because less sunlight means less heat. I'm not sure about the salinity 100% but I think it increases.
(Don't mind me, answering it properly because brainly is being annoying)
How would a herbicide kill the tree? Use your knowledge of photosynthesis to explain your answer.
Answer: The herbicide (weed killer) takes away a plant's ability to get carbon dioxide. This causes the plant to not be able to produce glucose a source of energy for the plants. Even if there are plenty of water, sunlight, and chloroplasts, the photosynthesis process won't be complete without carbon dioxide. Once in the soil, herbicides can suffer alteration in their structure and composition, due to the action of physical, chemical, and biological processes. This action on the herbicides is the one that will determine their activity and persistence in the soil. Plants damaged by soil sterilant herbicides are the least likely to recover. Plants that show signs of growing out of the problem will likely recover. Plants that appear to lose vigor may not. The survival of damaged plants can be increased by reducing other stresses.
un leopardo recorre una distancia de 10 metros de un tiempo de 5 segundos en linea recta. Considerando la anterior , ¿ con que rapidez se desplaza el leopardo?
Answer:
soy pequeno
Explanation:
a scale uses the principle of. to measure how much something weighs
Answer:
mass
Explanation:
mass is weight mass is weight mass is weight
please help me with this question !
Answer: i dont understand
Explanation:
Question
What is the name of this ben zene ?
the name of this benzene is benzene circle
if you also don't understand the go in this link
https://en.m.wikipedia.org/wiki/File:Benzene_circle.svg
plz give me brainliest+ thanks i need it to reach in expert : )