Answer: 0.44 j/g degrees Celsius
Explanation: i got the answer right on my test
8. Which of the following have bacteria in their root nodules that fix nitrogen?
1. Legumes
b. Meat
c. "Trees
d. Algae
Answer:
Option A
Explanation:
Leguminous plants like pulses etc. have root nodules comprising of rhizobacterium which live in a symbiotic relationship with the roots of the plant and in turn fix the nitrogen in the soil in the roots of the leguminous plants.
Hence, option A is correct
How much energy (in KJ) is needed to melt 15g of ice at -4oC and raise it to a temperature of 115oC? Round the closest number, and include units
Answer:
The energy needed is 45.7659 kJ
Explanation:
The given mass of the ice, m = 15 g
The initial temperature of the ice, T₁ = -4°C
The temperature
The final temperature, T₂ = 115°C
The specific heat capacity of ice, c₁ = 2.09 J/(g·°C)
The latent heat of ice, l₁ = 334 J/g
The heat capacity of water, c₂ = 4.184 J/(g·°C)
The latent heat of vaporization, l₂ = 2260 J/g
The specific heat of steam, c₃ = 2.02 J/g
Therefore, we get the energy needed, ΔQ, as follows;
ΔQ = m·c₁·(T₂ - Tₐ) + m·l₁ + m·c₂(Tₓ - Tₐ) + m·l₂ + m·c₃·(T₂ - Tₓ)
Where;
Tₐ = The melting point temperature of water = 0°C
Tₓ = The boiling point temperature of water = 100°C
∴ ΔQ = 15×2.09×(0 - (-4)) + 15 × 334 + 15×4.184×(100 - 0) + 15×2260 + 15×2.02×(115 - 100) = 45,765.9
The energy needed, ΔQ = 45,765.9 J = 45.7659 kJ.
If the rate-determining step limits the speed of a reaction, which statement is correct?
A.
Even if one or more fast steps occur in a reaction, the overall reaction cannot proceed any faster than the slowest step.
B.
If the first step is slow and the second step is fast, then the second step should determine the rate of the overall reaction.
C.
Increasing the concentration of a molecule that occurs in a fast step after a slow step will increase the overall rate of the reaction.
D.
In a unimolecular reaction where A decomposes to B and C, the rate of the reaction will decrease if the concentration of A is increased.
Answer:
A:Even if one or more fast steps occur in a reaction, the overall reaction cannot proceed any faster than the slowest step.
Answer:
A
Explanation:
Edge 2020
hope this helps :)))))
Which influences line form
Answer:
Line form is influenced by how fast we are writing and the pressure and also what writing instrument is used
The initial temperature of a reaction is 24.7 °C. The temperature decreases by 3.2 °C. What is the new temperature of the reaction? Someone help
Answer:
I think it's 21.5 *C
Explanation:
Aqueous aluminum phosphate reacts with solid magnesium to produce solid aluminum and aqueous magnesium phosphate. Write the balanced chemical equation for this chemical reaction using the correct chemical formulas and include conditions (s, l, g, or aq). Put your answer in the box below.
Answer:
2AlPO4(aq) + 3Mg(s) -------> Mg3(PO4)2(aq) + 2Al(s)
Explanation:
The principle of writing balanced chemical reaction equations states that; the number of atoms of each element on the right hand side of the reaction equation must be equal to the number of atoms of the same element on the left hand side of the reaction equation.
The reaction is between aqueous aluminum phosphate reacts and solid magnesium to produce solid aluminum and aqueous magnesium phosphate. The equation is represented as follows;
2AlPO4(aq) + 3Mg(s) -------> Mg3(PO4)2(aq) + 2Al(s)
Explain the Anchoring Phenomenon (summary)
HELP ME WITH THIS PLSSSSS
Answer:Predatorrrrrrrrrrrrrrrr
Pls gimme Brainliest
Identify whether each compound is a straight chain, branched chain, or cycloalkane,
Answer:
First Part: branched chain, cycloalkane, straight chain
Second Part: straight chain, branched chain, cycloalkane.
Explanation:
Edg 2021
Answer:
A: branched chain, B: cycloalkane, and C: straight chain.A: straight chain, B: branched chain, and C: cycloalkane.Explanation:
I NEED THIS ASAP Someone please help me
Read the chemical equation. 2NaOH + H2SO4 → Na2SO4 + 2H2O Which of the following statements would be correct if four moles of NaOH were used in this reaction?
A. Two moles of water were produced from this reaction.
B. Four moles of water were produced from this reaction.
C. One mole of H2SO4 was used in this reaction.
D. Eight moles of H2SO4 were used in this reaction.
Answer:
the answer is B
Explanation:
Answer: B!
Explanation:
B. Four moles of water were produced from this reaction.
got it right on the test :-)
how does H3O+ and OH- relate to acids, bases, and the pH scale?
Answer:
For pure water, the values of [H3O+] and [OH-] are equal and thus their values are both 1.0 x 10-7. If there is an equal amount of acid and base present in any solution, the solution is called "neutral" and the pH of the solution is 7. ... The sum of the pH and pOH must always equal 14.
Explanation:
2. All metals are good conductors because their electrons can
move easily through the metal.
What do you think will be true about electrons in an insulator?
Help me please
This is for my science homework
Answer: An insulator would be made out of material unable to conduct electricity due to lack of fluid movement for electrons, such as rubber. Rubber properties not only prevents them from freely moving, but also helps electrons stay tightly bound to each other.
Hope this helps ^_^
I'm timed! Select the STEM-related activities performed in the fashion industry.
garment weaving
market analysis
pattern making
fabric dyeing
product promotion
product advertising
Answer:
All of them I think
Explanation:
STEM is science, technology, engineering and math, and all of them use that in some aspect
ANSWER FAST PLEASE!
Balance the following equation:
__Hg + __O₂ --> __HgO
Answer:
4Hg+2O2=4HgO
four Mercury + four oxygen
14.
Unlike addition polymers, condensation polymers form from _____.
monomers that have only one functional group
the head-to-tail joining of monomer units
the joining of unsaturated monomers
monomers that have at most three carbon atoms
Answer:
Addition polymers are formed when monomer units join each other in a process that involves the rearranging of electrons in double or triple bonds in the monomer. The polymer is the ONLY product formed.
EX:C=C + C=C + C=C - ·C-C-C-C-C-C·
Ethene(ethylene) monomers -> part of polyethene
Explanation:
in what group and periods is most reactive metals
How do we balance a chemical equation?
O adding elements as necessary
changing subscripts
erasing elements as necessary
placing coefficients
Answer: placing coefficients
Explanation: In a balanced chemical equation, the total number of atoms of each element present is the same on both sides of the equation. Stoichiometric coefficients are the coefficients required to balance a chemical equation. These are important because they relate the amounts of reactants used and products formed.
HURRY!!!
What can you infer about the growth of the seed represented in the graphs below?
Answer:
B
Explanation:
I need the answer by 12❤️
Answer:
answer number 3? ac
Explanation:
3. How many moles of NaCl are present in 6000. La 1.5 M NaCl solution?
A.9.0
B.9.0 x 10^3 moles
C.4.0 x 10^8 moles
Answer:
Option A (9.0) is the correct alternative.
Explanation:
The given values are:
Molarity,
= 1.5 M
Volume,
= 6000 mL
or,
= 6 L
As we know,
⇒ [tex]Molarity=\frac{Moles}{Volume}[/tex]
or,
⇒ [tex]The \ moles \ of \ NaCl=Molarity\times Volume[/tex]
By putting the values, we get
[tex]=1.5\times 6[/tex]
[tex]=9 \ mol[/tex]
Potassium hydrogen phthalate, KHP, is used as a primary standard for determining the concentration of a solution of NaOH by titration. If the KHP has not been dried before weighing, the calculated molarity of the NaOH would be
A) higher than the actual value, since water is included in the apparent mass of KHP
B) higher than the actual value, since the presence of water requires a larger volume of titrant
C) lower than the actual value, since NaOH absorbs water
D) unaffected, since KHP is a strong acid
E) unaffected, since water is routinely added before the titration
Answer:A
Explanation:
If the KHP has not been dried before weighing, the calculated molarity of the NaOH would be higher than the actual value, since water is included in the apparent mass of KHP.
The KHP is Potassium hydrogen phthalate. It is commonly used as a primary standard in pure form for sodium hydroxide titrations because it is stable in air making it easy to weigh.
However, if KHP is not dried very well, the mass of water is included as part of the mass of KHP and this will make calculated molarity of KHP to be higher than the actual value.
Again, the reaction between KHP and NaOH has a 1:1 molar ratio so if the molarity of KHP is higher than its actual value, the molarity of the NaOH would also be higher than the actual value.
Learn more: https://brainly.com/question/17134477
Looking at the chart, which substance would heat up the fastest?
Question 9 options:
Iron
Aluminum
Brass
Alcohol
Answer:
Aluminum would heat up the faster
Using the terms "breaking and making bonds", explain the net energy change for the chemical reaction
between water and ammonium nitrate.
What form of energy does a monkey hanging on a tree have?
Answer:
Potential energy
Explanation:
Hanging objects have (gravitational) potential energy
Answer:
Explanation:
Every cell in the monkey's body (and ours) is constantly converting the stored solar energy in glucose into work and heat. The work is used to carry on cell processes like growing, reproducing, moving molecules around, and getting rid of waste. The heat is a byproduct of the fuel "burning" process.
Will give brainliest!
How does the melting of ice caps near the North Pole affect the salinity of the ocean?
Salinity decreases because freshwater flows into the ocean
Salinity increases because of the stored pockets of air and salt
Salinity increases because salt from the ice caps flows into the ocean
There is no change in the ocean’s salinity with this process
Answer:
A.
Explanation:
melting of ice will increase water in oceans due to which water in oceans will increase and salinity will decrease. hence, melting of ice caps near the north pole affects salinity of the ocean
If you have a gas stored at a constant temperautre, describe how increasing the pressure will affect the volume.
Answer:
It means that for a gas at a constant temperature, pressure × volume is also constant. So increasing pressure from pressure1 to pressure2 means that volume1 will change to volume2, providing the temperature remains constant.
Convert 623g of Fe to grams
Answer: The answer is 11.15587787626466 or rounded up it will be 11.2 mol.
Explanation: By converting Grams of any element it will be in moles which is grams in philosiphical terms. But by converting Fe(or iron) It is called a Convertment of measurement units.
If Darian contains 3.25 moles of gas in a container with a volume of 60.5 liters and at a temperature of 400 K, what is the pressure inside the container?
PV = nRT
with atm: R = 0.0821 L*atm/(K*mol) with kPa: R =8.31 L*kPa /(K*mole)
Answer:
1.76atm
Explanation:
Using the ideal gas law equation;
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
According to the information provided in this question,
P = ?
V = 60.5 liters
n = 3.25 moles
T = 400 K
R = 0.0821 Latm/molK
Using PV = nRT
P = nRT/V
P = (3.25 × 0.0821 × 400) ÷ 60.5
P = 106.73 ÷ 60.5
P = 1.76atm
You're provided a 0.50 M solution of HCl. How many moles of HCl are present in 25 ml of this solution?
Answer:
0.0125 moles of HCl
Explanation:
(0.50 mol/L)(0.025 L) = 0.0125 moles of HCl
H2 + O2 + H2O how do I balance this?
Explanation:
[tex]2H _{2(g)} + O _{2(g)}→2H _{2}O _{(l)}[/tex]
Insert 2 on Hydrogen then a 2 on water molecule.