Rhizobium: are nitrogen-fixing bacteria that live in the nodules of legumes which convert nitrogen in soil into nitrogen compounds. so the answer is all the above i hope this helps
Answer:
All of the above
Explanation:
Rhizobium is an important diazotrophic bacteria in nitrogen cycle. They are involved in a symbiotic relationship with leguminous plants; they assist in nitrogen fixation in the roots of these plant by taking up nitrogen from the atmosphere and passing it into the plants (in the form of ammonia or amino acids) which allows the plant to grow in soil with low nitrogen. The plant in exchange provide organic acids for the bacteria which it uses for carbon and energy source.
From the above, we can deduce that
(a) rhizobium are nitrogen fixing bacteria
(b) they live in the nodules of legumes (hence the symbiotic relationship)
(c) convert nitrogen in soil into nitrogen compounds like ammonia or amino acids
hence, the correct option is all of the above
How is this an improvement on the traditional, paper coffee filters? A: they are less wasteful and more cost effective because they last longer B: a permanent filter is more expensive than a traditional filter C: they contain plastic which does not break down as easily as paper D: the coffee brewed using permanent filters does not taste as good?
An Improvement is a
What does the number below each element’s symbol represent
Final answer:
The number below each element's symbol on the periodic table refers to the atomic mass, which is different from the atomic number indicated by a subscript to the left of the symbol.
Explanation:
The number below each element's symbol on the periodic table represents the atomic mass of the element. This is different from the atomic number, which is represented as a subscript to the left of the element's symbol. Every element has a distinct symbol, typically the first one or two letters of its name, and the atomic number above each symbol in the periodic table indicates the number of protons in each element. For example, the element Carbon (C) has the atomic number 6, indicating it has 6 protons, and its atomic mass is shown beneath the symbol on the periodic table.
Question 4, can you give me the rule for naming these?
3 ethyl, 4 methylheptane. The compound is named by first identifying the longest carbon chain in the structure. in this case the chain has seven carbon atoms thus the prefix hept-.
Next you identify the substituent groups attached to the long carbon chain and name them from the lowest value of the integer assigned to the carbon atoms from either side. From the right, the ethyl group is attached to carbon number 3 while from the left, the methyl group is attached to carbon number 4. We therefore start with the right and name the attached groups first, including the carbon atoms to which they are attached.
Then we also take into consideration the highest number of bonds between the carbon atoms which is one from the question. Thus the suffix -ane is added if a maximum of one bond, -ene,if two bonds and -yne if three bonds.
One mole of ANY element contains the: same mass as one mole of any other element same number of atoms as one mole of any other element same gram-formula-weight as one mole of any other element both the first and second choices
One mole of any element contains the same number of atoms as one mole of any other element.
How do we define moles?Moles is define as the ration of the given mass of any substance to the molar mass of that substance.
In one mole of any substance, exact 6.022 × 10²³ number of atoms of that substance will present and this number is know as the Avogadro's number. For example, in 1 mole of O₂ molecule 6.022 × 10²³ number of oxygen molecules are present.
Hence, option (2) is correct.
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how does density of air related to elevation (altitude)
Answer:
The density of air goes down as you get higher with altitude.
Explanation:
Less air is pushing down on the molecules below it as you go up. This means that it is not as compacted, another word for which is dense.
The density of the air decreases with the increasing elevation (altitude).
What is altitude?Altitude is the height or distance measured in the up or vertical direction.
The higher the elevation, the less dense the air will be.
There are two reasons for this:
There is less air pushing down from above at higher altitudes, and gravity is weaker further away from the Earth's center.
As a result, air molecules may spread out more at higher altitudes, and air density drops.
Thus, As you go higher, the density of the air drops.
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Which conclusion could be made from Ernest Rutherford’s gold foil experiment?
The conclusion was that there must be space between the particles of an atom. The way he knew this is because while some of the radiation reflected off of the gold foil, other radiation went right through it.
Answer:
Mass of an atom is concentrated in a positively charged core called the nucleus.
Explanation:
Rutherford gold foil experiment expanded our understanding of the structure of an atom. When positively charged alpha particles were bombarded against a thin gold foil, Rutherford observed that majority of particles passed through the foil undisturbed whereas a small percentage retraced their path.
There were two main conclusions from the experiment:
-Since most alpha particles simply passed through undeviated this suggested that majority of the space inside the atom is empty
- Also, since some of them completely bounced back this suggested that there is a positively charged core in which the mass of the nucleus is concentrated.
Please answer these 2 questions if you get them right I will give BRAINLIEST and 25 points
Question 2: Biofuel
Question 3: Geothermal
What is its primary advantage of multiple researches obtaining the same result
The primary advantage of multiple researchers obtaining the same result is that it makes the result of the researches more reliable, and the chances of a mistake are minimized.
If only one research is made, by a single person or team, on certain thing, the result of the research can not be seen as reliable. The reason for this is that the research has not been repeated numerous times, and the chances of a mistake are much higher, thus making the research not very trustworthy.
On the other hand, if multiple researches or teams of researches are doing a research on the same thing, and they do come to the same result, than we can say that the result is much more reliable. The reason for that is that multiple different people or teams have conducted multiple researches, and the result is always the same, thus meaning that is is reliable, and the chances of a mistake are much more minimized.
Do Lemons Contain Natural Sugar?!
Yes they contain natural Sugar.
Final answer:
Yes, lemons contain natural sugars such as glucose, fructose, and sucrose, paired with essential nutrients like Vitamin C, fiber, and potassium. These sugars are part of the fruit's carbohydrates, contributing to its nutritional value and offering a more balanced energy release compared to added sugars.
Explanation:
Yes, lemons contain natural sugars. While lemons are widely recognized for their high Vitamin C content and sour taste due to citric acid, they also contain naturally occurring sugars such as glucose, fructose, and sucrose. These sugars are part of what makes up the carbohydrates in lemons. Unlike added sugars found in processed foods, the sugars in lemons come along with beneficial nutrients like fiber, potassium, and of course, Vitamin C. This combination helps in the slower absorption of sugar into the bloodstream, providing a more balanced energy release and contributing to the nutritional value of the fruit.
Understanding the composition of lemons can be essential for nutritional planning, especially in managing sugar intake. It showcases how naturally occurring sugars in fruits like lemons are part of a healthy diet when consumed in moderation as they are paired with essential nutrients. This contrasts with added sugars, which are not accompanied by these additional health benefits and are often consumed in larger quantities than recommended.
You have the same two resistors on a 10 volt series circuit. Will the voltage going into the second resistor be more, less, or the same as that going into the first resistor? Exact numbers aren’t needed!
NEED ANSWER ASAP PLEASE!
both resistance will have same voltage across it which is equal to 5 volt.
if resistance value is different then voltage drop across them will be different.
current in both resistance would be same.
let's say resistance is 5 ohm of each one.
total current = total voltage / total resistance
= 10 /(5+5) = 10/10 = 1 amp
now voltage across 5 Ohm resistance = current × resistance = 1× 5 = 5 volt
If the same two resistors on a 10 volt series circuit, the voltage going into the second resistor will be the same as that going into the first because they are connected into series.
What is a resistor?A resistor is a two terminal electrical component, that control the flow of charge in a circuit.
When the resistor is connected in series, the total voltage across all the resistors will be the same.
Thus, the voltage going into the second resistor will be the same as that going into the first.
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All atoms of the same element have the same atomic_____, which can be found on the periodic table ?
same atomic number..
Number is the answer.
Hope this helps.
Can Anyone Help me With this?
1 skeleton equation
Na +O2 =>Na2O
Balanced equation
4Na + O2 =>2 Na2O
2.word equation
Zinc +magnesium phosphide=magnesium + zinc phosphide
Balanced equation
3Zn +Mg3P2 =3Mg+ Zn3p2
3skeleton equation
Al +Br2 =>AlBr3
Balanced equation
2Al +3Br2 => 2AlBr3
4 word equation
Lithium + sulphur =>lithium sulphide
2Li + S => Li2S
The amount of energy required to move an electron from one energy level to the next higher one is known as: A. quantum of energy B. Aufbau principle C. mass number D. atomic number
Answer:
A
Explanation:
Quantum energy
Describe what a geologist would observe if she poured acid on the sculpture
They would observe erosion when you pour acid on rock that chemical erosion which feeds away at the item quicker than normal erosion.
A geologist would observe fizzing and bubbling when acid is poured on a sculpture made of materials like limestone or marble. This is due to the chemical reaction between acid and calcium carbonate in the rock, releasing carbon dioxide gas. Over time, acid rain can erode and damage such sculptures and monuments.
If a geologist poured acid on a sculpture, particularly one made of limestone or marble, they would likely observe a reaction where the acid would fizz and bubble upon contact with the rock. This reaction occurs because these types of rocks contain calcium carbonate, which reacts with acids like sulfuric acid and nitric acid commonly found in acid rain. The bubbling effect is due to the release of carbon dioxide gas as the calcium carbonate is dissolved.
Over time, acid rain can have a deleterious impact on sculptures and monuments made from these materials. It can cause erosion, degradation, and loss of detail in the art and architecture. This chemical weathering results from the acidic environment created by acid rain, which is capable of slowly dissolving the stone's surface. As seen in various photographic records, such as those in Greenwood cemetery or on the Notre Dame cathedral, the damage can be extensive, leading to significant alterations in the appearance and structural integrity of affected sculptures and buildings.
What is the potential energy of a 2 kg plant that is on a windowsill 1.3 m high
Answer:
P.E = 25.48 J
Explanation:
Given data:
Mass = 2 Kg
Height = 1.3 m
Potential energy = ?
Solution:
Formula:
P.E = m . g . h
P. E = potential energy
m = mass in kilogram
g = acceleration due to gravity
h = height
Now we will put the values in formula.
P.E = m . g . h
P.E = 2 Kg . 9.8 m /s² . 1.3 m
P.E = 25.48 Kg. m² / s²
Kg. m² / s² = J
P.E = 25.48 J
Answer:
PE= 25.48 J
Explanation:
m= 2 kg
h= 1.3 m
PE= ?
m= 2 kg
h= 1.3 m
PE= ?
What amount of heat is required to raise the temperature of 85.9 g of water by 7°C? The specific heat of water is 4.184 J/gºC.
Answer:
2516 J.
Explanation:
The amount of heat required to raise the T of water (Q) can be calculated from the relation:Q = m.c.ΔT.
where, Q is the amount of heat required to raise the T of water,
m is the mass of water (m = 85.9 g),
c is the specific heat of ethanol in the gas phase (c = 4.184 J/g °C),
ΔT is the temperature difference (final T - initial T) (ΔT = 7.0 °C).
∴ Q = m.c.ΔT = (85.9 g)(4.184 J/g °C)(7.0 °C) = 2516 J.
[tex]\\ \rm\Rrightarrow Q=mc\delta T[/tex]
[tex]\\ \rm\Rrightarrow Q=85.9(4.184)(7)[/tex]
[tex]\\ \rm\Rrightarrow Q=2515.83J[/tex]
how many moles are in 425.0 g of sodium chloride?
About 7.272 moles. Hope this helps!
There are 7.26 moles in 425.0 g of sodium chloride
HOW IS NUMBER OF MOLES CALCULATED?
The number of moles contained in a substance is calculated by dividing the mass (g) of that substance by its molecular mass (g/mol). Mathematically, this means:no. of moles = mass ÷ molar mass
Molar mass of sodium chloride (NaCl) given in this question is calculated as follows:23 + 35.5
= 58.5g/mol
According to this question, there are 425.0g of sodium chloride, hence, the number of moles can be calculated thus:no. of moles = 425g ÷ 58.5g/mol
no. of moles = 7.26moles
Therefore, there are are 7.26 moles in 425.0 g of sodium chloride.
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you need to make 50.00 ml of 0.00100 M NaOH solution. Calculate the volume of 0.0500 M NaOH solution and the volume of H20 to make proper dilution?
Hi!
Answer: 1ml of NaOH and 49 ml of Water
Concentration of NaOH to make: 0.001 M ( C1 )
Volume of NaOH to make: 50 ml ( V1 )
Concentration of NaOH in stock: 0.05 M ( C2 )
Volume of stock to use: V2
Using the formula C1 V1 = C2 V2 which is the standard formula for determining the dilutions to acquire a specified volume and concentration, we get:
0.001 M x 50 ml = 0.05 M x V2
V2 = 1 ml
So using 1ml of 0.05 M NaOH and 49 ml of Water
Hope this helpsan atom has an atomic mass of 27 and 13 neutrons , how many electrons will this atom have?
It will have 27 neutrons and protons because the atomic number is the same as the number of neutrons and protons.
describe two layers of skins
There are two layers of skin, the epidermis, and the dermis.
Dermis: Is a special subcutaneous tissue. But deeper in its structures is found under the tissues that includes the muscle, bone and other structeral appearences, within the skin.
Epidermis: This is mainly the outer layer of our skin.
water is amphoteric, which means it can behave like a bronsted-lowry ____ and donate protons, or, it can act like a bronsted-lowry ____, and accept protons.
A - acid;base
B - base;acid
C - ion;isotope
D - isotope;ion
The answer would be A.
Reason Brownsted-lowry Acid donates protons and the opposite for Brownsted-lowry Base
Answer:
A - acid;base
Explanation:
A sample of helium occupies 0.56 L at 988 mm Hg and 25 celsius. If the sample is transferred to a 1.0L flask at the same temperature, what will the gas pressure be in the new flask?
Solve using Boyle’s Law
= 553.28 mmHg
Explanation;According Boyle's the volume of a fixed mass of a gas is inversely proportional to pressure at constant temperature.
P1V1 =P2V2
P1 = 988 mmHg
V2 = 0.56 L
V2 = 1.0 L
P2 = ?
P2 = P1V1/V2
= (988 × 0.56)/1
= 553.28 mmHg
Boyle's Law explains the relationship between gas pressure and volume at constant temperature and amount of gas. By applying Boyle's Law formula, we can calculate the gas pressure in the new 1.0 L flask. The pressure in the new flask is approximately 554.86 mm Hg.
Boyle's Law: Boyle's Law states that the pressure of a gas is inversely proportional to its volume when the temperature and amount of gas remain constant.
Using Boyle's Law formula, we can calculate the new pressure in the 1.0 L flask: P1V1 = P2V2. Plugging in the values, (988 mm Hg)(0.56 L) = P2(1.0 L), we find P2 = 554.86 mm Hg.
The gas pressure in the new 1.0 L flask will be approximately 554.86 mm Hg.
a (n) ____ in a molecule influence the way that a molecule reacts
A) lipid
B) hydrocarbon
C) organic compound
D) functional group
This is a Functional Group
Functional groups are responsible for chemical reactions of molecules.
What would happen to the temperature if the pressure of a gas is increased and the volume is constant?
a.) Decrease
b.) Remain the same
c.) Increase
d.) Halved
Answer: Increase
Explanation:
According to Gay-Lussac's Law, the temperature of the gas would increase with increase in pressure on it while keeping the volume constant as the law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas, when the volume is kept constant.
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Final answer:
If the pressure of a gas is increased while keeping the volume constant, the temperature of the gas will increase. This is a direct consequence of Gay-Lussac's Law, where pressure and temperature are directly proportional to each other in these conditions.
Explanation:
When the pressure of a gas is increased and the volume is kept constant, according to Gay-Lussac's Law, the temperature of the gas must increase. This is because pressure and temperature are directly proportional in a contained gas when the volume is constant. So, if you increase the pressure, the temperature will also increase as the particles will collide more frequently and with greater energy against the walls of the container, which relates to an increase in temperature.
Now let's address the other scenarios briefly:
If the volume of a gas is increased while temperature and pressure remain constant, the gas will cool down due to the decreased particle collisions.If the volume of a gas decreases, with all other conditions being constant, the pressure increases, as per Boyle's Law, which states that volume and pressure are inversely related for a given amount of gas at constant temperature.When the temperature of a gas is decreased, assuming constant pressure, its volume decreases, following Charles's Law, which states that volume is directly proportional to temperature at constant pressure.Is the pressure, volume, and temperature of a gas are know, which can most likely be found by using the ideal gas law?
A. The molar amount of gas.
B. The partial pressure of the gas.
C. The standard temp and pressure
D. The molar mass
The molar amount of gas can most likely be found by using the ideal gas law. This is because the ideal gas law states pV = nRT. P, V, and T are the pressure, volume, and temperature, which are the known variables. The R stands for the Universal Constant of Gases; also known. Therefore, the unknown is n, the number of moles (molar amount) of gas, and so you would solve for n from the law.
Answer: A) The molar amount of gas
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Consider the phase change lab what is required to bring about a phase change
Final answer:
The energy involved in a phase change depends on the number and strength of bonds or force pairs.
Explanation:
The energy involved in a phase change depends on the number and strength of bonds or force pairs. The number of bonds is proportional to the number of molecules and thus to the mass of the sample.
The energy per unit mass required to change a substance from the solid phase to the liquid phase, or released when the substance changes from liquid to solid, is known as the heat of fusion.
The energy per unit mass required to change a substance from the liquid phase to the vapor phase is known as the heat of vaporization.
The strength of the forces depends on the type of molecules. The heat Q absorbed or released in a phase change in a sample of mass m is given by:
The reaction shown below has a negative enthalpy change and a positive entropy change.
203 (g) yields 3O2 (g)
Which of the following best describes this reaction? (1 point)
A. The reaction will only be spontaneous at high temperatures.
B. The reaction will only be spontaneous at low temperatures.
C. The reaction will not be spontaneous at any temperature.
D. The reaction will be spontaneous at any temperature.
Answer:
D. The reaction will be spontaneous at any temperature.
Explanation:
For the reaction to be spontaneous, the free energy change (ΔG) must be negative (< 0).∵ ΔG = ΔH - TΔS
where, ΔG is the free energy change.
ΔH is the enthalpy change,
ΔS is the entorpy change.
Since ΔH is negative and ΔS is positive;ΔG = (- ve) - T(+ ve) = - ve value.
ΔG will be negative at all temperatures.
So, The reaction will be spontaneous at any temperature.
Consider the following equilibrium reaction having gaseous reactants and products.
4HCl + O2 ⇌ 2H2O + Cl2
Which of the following would result from increasing the volume of oxygen?
A.The volume of hydrochloric acid increases.
B.The rate of forward reaction increases.
C.The rate of backward reaction increases.
D.The volume of water vapor decreases.
B.The rate of forward reaction increases.
Explanation;Le Chatelier's principle states that changing a factor such as concentration, temperature, or pressure of a reaction at equilibrium will cause the reaction to shift in the direction that counteracts the effect of that change. Therefore, when reactants are added to a reaction at equilibrium shift when more reactants are added then the reaction shifts to the right to make more products.Answer:
B
Explanation:
I took the test
Which of the following compounds would be primarily ionic? Methane CH4 , Ammonia NH3, Calcium Chloride CaCL2 or Carbon dioxide, CO2
Which will have the lowest boiling point?
A.
pure water
B.
0.5 M NaCl (aq)
C.
1.0 M NaCl (aq)
D.
2.0 M NaCl (aq)
Some of the solutions exhibit colligative properties. These properties depend on the amount of
solute dissolved in a solvent. These properties include freezing point depression, boiling
point elevation, osmotic pressure and vapor pressure lowering. From the given choices, the correct answer is the first option. Pure water will have the lowest boiling point because there are no solute particles to change the boiling point of water while other options will have an elevated boiling point because of the solute.
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Answer: A. pure water
Explanation:
[tex]\Delta T_b=i\times k_f\times m[/tex]
[tex]\Delta T_b[/tex] = change in boiling point
i = Van'T Hoff factor
[tex]k_f[/tex] = freezing point constant
m = molality
1. For pure water
, i= 1 as it is a non electrolyte and does not dissociate.
2. For [tex]0.5M NaCl[/tex]
[tex]NaCl\rightarrow Na^+Cl^-[/tex]
, i= 2 , as it is a electrolyte and dissociate to give 2 ions and concentration will be (0.5+0.5)=1M[/tex]
3. For [tex]1M NaCl[/tex]
[tex]NaCl\rightarrow Na^+Cl^-[/tex]
, i= 2 , as it is a electrolyte and dissociate to give 2 ions and concentration will be (1+1)=2M[/tex]
4. For [tex]2M NaCl[/tex]
[tex]NaCl\rightarrow Na^+Cl^-[/tex]
, i= 2 , as it is a electrolyte and dissociate to give 2 ions and concentration will be (2+2)=4M[/tex]
Thus as vant hoff factor is lowest for pure water and thus the boiling point will be lowest.