Answer:
0.041 MExplanation:
The molarity of a solution when given the number of moles the substance and it's volume can be found by using the formula
[tex]c = \frac{n}{v} \\ [/tex]
n is the number of moles
v is the volume in L
We have
[tex]c = \frac{0.4}{9.79} \\ = 0.04058...[/tex]
We have the final answer as
0.041 MHope this helps you
Why should you prefer dry-ashing to wet-ashing of a food sample such as cabbage?
Answer:
The work was to demonstrate a repaid, precise and accurate determination method for ten trace elements (Al, Cd, Cr, Cu, Fe, Mg, Mn, Ni, Se and Zn) in periostracum serpentis (PS) and periostracum cicadae (PC) by inductively coupled plasma atomic emission spectrometry (ICP-AES). In order to evaluate the best digestion method, three different sample digestion methods including dry ashing, wet ashing and microwave digestion procedures were compared in this study.
Explanation:
What type of reaction is this? Pb + 2NaCl → PbCl2 + 2Na
Explain the difference between an exothermic and an endothermic reaction.
Answer:
Explanation:
Heat is a reactant.
If the equation requires heat to occur, the reaction is endothermic
The equation would have this model
A + B + heat =====> C + D
If the equation gives away heat, then it is exothermic
The equation would look like this. (I'll use a common reaction)
CH4 + 2O2 - heat ===> CO2 + 2H2O
The heat is minus when it has to be given away.
How many moles are in 454 Liters of a gas?
Answer:
20.27 mol
Explanation:
454 L x (1 mol/22.4 L) = 20.27 mol
Dawn is comparing how different animals move and the structures they use to move. She made the table shown below.
Animal Method of movement Structures used for movement
panther walks legs and feet
parrot flies wings
shark swims
Which structure completes the table for the shark?
eyes and brain
skin and scales
tail and fins
teeth and jaws
Answer:
tail and fins
Explatanation:
A gas in a sealed container has a pressure of 125 atm at a temperature of 303 K. If the pressure in the container is increased to 200 atm, what is the new temperature if the volume remains constant?
(Show work pls :)!)
Answer:
485 K
Explanation:
Step 1: Given data
Initial pressure (P₁): 125 atmInitial temperature (T₁): 303 KFinal pressure (P₂): 200 atmFinal temperature (T₂): ?Step 2: Calculate the final temperature of the gas
Assuming constant volume and ideal behavior, we can calculate the final temperature of the gas using Gay Lussac's law.
P₁/T₁ = P₂/T₂
T₂ = P₂ × T₁/P₁
T₂ = 200 atm × 303 K/125 atm = 485 K
How saliva works as a buffering agent?
Answer:
The carbonic acid/bicarbonate buffer is the major buffer in stimulated saliva, with bicarbonate acting mainly to neutralize acids produced by bacteria when they digest sugars in the mouth or acids from the stomach. The concentration of the bicarbonate ion depends largely on the salivary flow rate.
Explanation:
Basta Yan sagut ko eh
Answer:
The carbonic acid/bicarbonate buffer is the major buffer in stimulated saliva, with bicarbonate acting mainly to neutralize acids produced by bacteria when they digest sugars in the mouth or acids from the stomach. The concentration of the bicarbonate ion depends largely on the salivary flow rate
Explanation:
I'm having with chemistry assignments I need a help
Answer:
the question please? illl help
A(n) _________ is an atom or a group of atoms with either a positive or negative charge
O compound
O ion
O molecule
O nucleus
Answer:
the answer is ion..
hope it helps..
What is the Kc for the following reaction at equilibrium at 800∘C if [CO2]= 0.030 M ? CaCO3(s)⇌CaO(s)+CO2(g)
Answer:
0.030
Explanation:
Step 1: Write the balanced reaction at equilibrium
CaCO₃(s) ⇌ CaO(s) + CO₂(g)
Step 2: Calculate the concentration equilibrium constant
The concentration equilibrium constant (Kc) is equal to the product of the concentrations of the products raised to their stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients. It doesn't include solids or pure liquids.
Kc = [CO₂] = 0.030
HNO3 + NaOH → NaNO3 + H2O
Answer:
Explanation: what is the question?
This is a neutralisation reaction.
Balance the following equations:
1) C2H402+_02->_C02+ _H20
2) V205+ _CaS→_Ca0+ V2S5
3) S8+_O2->_SO2
Answer:
1) 0 C2H4O2 + 0 O2 -> 0 CO2 + 0 H2O (balanced)
2) V2O5 + CaS -> CaO + V2S5
just additional info: V2O5 is divanadium pentaoxide
LHS (Left hand side)
V: 2
O: 5
Ca: 1
S: 1 x 5 [to balance with the right hand side of the equation]
RHS (Right hand side)
V: 2
O: 1 x 5 [to balance with the left hand side of the equation]
Ca: 1
S: 5
When you balance any elements, you have to balance the whole chemical compound.
Thus,
V2O5 + 5 CaS -> 5 CaO + V2S5
LHS CHECK:
V: 2
O: 5
Ca: 5
S: 5
RHS CHECK:
V: 2
O: 5
Ca: 5
S: 5
3) S8 + O2 -> SO2
LHS:
S: 8
O: 2
RHS:
S: 1 x 8 [to balance with LHS]
O: 2
When you balance any elements, you have to balance the whole chemical compound.
S8 + O2 -> 8 SO2
When we add 8 to the RHS, it gives us 8S, 16 O.
In order to balance that into the RHS, I need to multiply the O2 by 8, which will give 8(O2) = 16 O particles.
Therefore, S8 + 8 O2 -> 8 SO2 is the final answer for (3).
What type of consumer eats only producers?
Answer: Primary consumers make up the second trophic level. They are also called herbivores. They eat primary producers—plants or algae—and nothing else. For example, a grasshopper living in the Everglades is a primary consumer
Answer:
primary consumer make up the second trophic level .they are also herbivores they eat primary consumer plants or alger and nothing else .for example a grasshopper living in the everglades is a primary consumer
When Thomas Edison first sold electricity, he used zinc coulometers to measure charge consumption. (In a coulometer the cathode is weighed before a current is passed through it, and then again after the passage of current. The weight increase is proportional to the amount of current that flows through the cathode.) If the zinc plate in one of Edison's coulometers increased in mass by 14.47 g, how much charge had passed through it
Answer:
The answer is "[tex]42537.93 \ C[/tex]".
Explanation:
Molar mass : [tex]Z_n = 65.38 \ \frac{g}{mol}\\\\[/tex]
[tex]\to Zn^{2+} + 2e^{-} = Zn\\\\[/tex]
[tex]\therefore\\\\ \to 65.38 \ g \ of\ Z_n \ require: \\\\ \to 2 \times 96500\ C\\\\\to 14.41 \ g\ require,\\\\ \to \frac{(14.41 \times 2 \times 96500)}{65.38} \ \frac{g}{mol} = 42537.93 \ C[/tex]
Which letter in the rock cycle diagram represents metamorphic rock?
A)
A.
B)
B.
)
D.
D)
E.
Answer:
B.Explanation:
Hopes this helps. Mark as brainlest plz!Answer:
b
Explanation:
learned this in science class
What volume (in mL) of 0.3900 M HCl is required to neutralize 50.00 mL of 0.8000 M NaOH?
Answer:
102.6 mL
Explanation:
The reaction that takes place is:
NaOH + HCl → NaCl + H₂OFirst we calculate how many NaOH moles are there in 50.00 mL of a 0.8000 M solution:
0.8000 M * 50.00 mL = 40 mmol NaOHThen we convert NaOH moles into HCl moles:
40 mmol NaOH * [tex]\frac{1mmolHCl}{1mmolNaOH}[/tex] = 40 mmol HClFinally we calculate the volume of a 0.3900 M solution would contain 40 milimoles:
40 mmol / 0.3900 M = 102.6 mLwhy are ionic compound soluble in water
Answer:
Most ionic compounds are soluble in water. Polar water molecules have a strong attraction for charged ions and the charged ions become solvated as they dissociate into water and ionic compounds are soluble in water.
Calculate the frequency of a light wave that has a wavelength of 9.2dm.
What is the energy of the reactants?
k]
What is the energy of the products?
k]
What is the activation energy of the forward reaction?
k]
What is the activation energy of the reverse reaction?
k]
What the energy of the forward reaction?
k]
What is the energy of the reverse reaction?
Is the forward reaction endothermic or exothermic?
Is the reverse reaction endothermic or exothermic?
Answer:
1. The energy of the reactant is 50 KJ
2. The energy of the product is 100 KJ
3. The activation energy of the forward reaction is 200 KJ.
4. The activation energy of the reverse reaction is 150 KJ.
5. The energy of the forward reaction is +50 KJ
6. The energy of the reverse reaction is –50 KJ
7. Endothermic reaction
8. Exothermic reaction
Explanation:
1. Determination of the energy of reactant.
From the diagram given above, the energy of the reactant is 50 KJ
2. Determination of the energy of product.
From the diagram given above, the energy of the product is 100 KJ.
3. Determination of the activation energy of the forward reaction.
The activation energy is the energy between the reactant and the peak. It can be obtained as follow:
Energy of reactant (Eᵣ) = 50 KJ
Energy at the peak (Eₕ) = 250 KJ
Activation energy (Eₐ) =?
Eₐ = Eₕ – Eᵣ
Eₐ = 250 – 50
Eₐ = 200 KJ
Thus, the activation energy of the forward reaction is 200 KJ
4. Determination of the activation energy of the reverse reaction.
Energy of reactant (Eᵣ) = 100 KJ
Energy at the peak (Eₕ) = 250 KJ
Activation energy (Eₐ) =?
Eₐ = Eₕ – Eᵣ
Eₐ = 250 – 100
Eₐ = 150 KJ
Thus, the activation energy of the reverse reaction is 150 KJ
5. Determination of the energy of the forward reaction.
Energy of reactant (Eᵣ) = 50 KJ
Energy of product (Eₚ) = 100 KJ
Enthalpy change (ΔH) =?
ΔH = Eₚ – Eᵣ
ΔH = 100 – 50
ΔH = +50 KJ
Thus, the energy of the forward reaction is +50 KJ
6. Determination of the energy of the reverse reaction.
Energy of reactant (Eᵣ) = 100 KJ
Energy of product (Eₚ) = 50 KJ
Enthalpy change (ΔH) =?
ΔH = Eₚ – Eᵣ
ΔH = 50 – 100
ΔH = –50 KJ
Thus, the energy of the reverse reaction is –50 KJ
7. The forward reaction is endothermic reaction because the energy of the product is higher than the energy of the reactant which leads to positive energy of the forward reaction (+50 KJ).
8. The reverse reaction is exothermic reaction because the energy of the product is lesser than the energy of the reactant which leads to negative energy of the reverse reaction (–50 KJ). In a nut shell, we can say that the energy of the reverse reaction is exothermic because its energy of reaction is –50 KJ.
What is the function of an atoms nucleus?
1. It holds protons and
neutrons
2. It contains electrons
3.it communicates with other atoms
4.none and above
Answer:
The answer to the question is A. :)
The correct answer is Option A.
Protons and neutrons are found in the nucleus.
Explain about atoms nucleus?An atom is a complex configuration of negatively charged electrons arranged around a positively charged nucleus in predetermined shells. Electrically positive protons and electrically neutral neutrons make up atomic nuclei. The strongest fundamental force known to science, also known as the strong force, holds these things together. The nucleus typically makes up more than 99.9% of the atom's mass but much less than.01 percent of its volume.Although protons and neutrons are similar in mass, protons have one unit of positive charge (+ e), while neutrons have no charge. The center of an atom is where all of these particles are crammed into a very small area.The force needed to keep an atom together and in place is produced by the atom's nucleus.To learn more about atoms nucleus refer to :
https://brainly.com/question/1268608
#SPJ2
How many liters is 3.3 moles of a gas?
Answer:
224.1
Explanation:
Only animals and not plants can adapt to their environment true or false
Answer:
true
Explanation:
np have a good day brainliest?
Examination of the first few successive ionization energies for a given element usually reveals a large jump between two ionization energies. For example, the successive ionization energies of magnesium show a large jump between IE2 and IE3. The successive ionization energies of aluminum show a large jump between IE3 and IE4. Explain why these jumps occurs and how you might predict them.
Answer:
See Explanation
Explanation:
Ionization energy refers to the energy required to remove an electron from an atom. Metals have lower ionization energy than non metals since ionization energy increases across a period.
One thing that we must have in mind is that it takes much more energy to remove an electron from an inner filled shell than it takes to remove an electron from an outermost incompletely filled shell.
Now let us consider the case of magnesium which has two outermost electrons. Between IE2 and IE3 we have now moved to an inner filled shell(IE3 refers to removal of electrons from the inner second shell) and a lot of energy is required to remove an electron from this inner filled shell, hence the jump.
For aluminium having three outermost electrons, there is a jump between IE3 and IE4 because IE4 deals with electron removal from a second inner filled shell and a lot of energy is involved in the process hence the jump.
Hence a jump occurs each time electrons are removed from an inner filled shell.
This part of the wind turbine converts the mechanical energy of the rotor/shaft captured from the wind into_________ energy
O mechanical
O potential
O electrical
O nuclear
electrical energy would be the right answer.
Explanation:
How many moles is 1.80 * 10^24 molecules of H2O?
Answer:
3.0 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{1.8 \times {10}^{24} }{6.02 \times {10}^{23} } = 2.990.. \\ [/tex]
We have the final answer as
3.0 molesHope this helps you
3. How many oxygen atoms are there in 5.0 mol of water?
Answer:
3.01 * 10^23 oxygen atoms
Explanation:
Water is H2O. So there are one oxygen atom for every molecule of water.
So in 5.0 mol of water molecules, there are 5.0 mol of oxygen atoms.
Since 5.0 mol = 5 * 6.02 * 10^23 molecules, there are 3.01 * 10^23 oxygen atoms.
How do you balance 3CaCl2+3Na(PO4)=Ca3(PO4)2+6NaCl
Answer:
[tex]3CaCl_2+2Na_3PO_4\rightarrow Ca_3(PO_4)_2+6NaCl[/tex]
Explanation:
Hey there!
In this case, according to the law of conservation of mass, it possible to balance the following reaction:
[tex]CaCl_2+Na_3PO_4\rightarrow Ca_3(PO_4)_2+NaCl[/tex]
By adding a 3 on CaCl2, a 2 on Na3PO4 and a 6 on NaCl in order to equal the atoms of calcium, chlorine, sodium, phosphorous and oxygen, as follows:
[tex]3CaCl_2+2Na_3PO_4\rightarrow Ca_3(PO_4)_2+6NaCl[/tex]
Best regards!
2. A plant growing in response to the sunlight.
A.Gravitropism
B.Phototropism
C.Thigmotropism
D.Hydrotropism
Answer:
phototropism
Explanation:
since photo is (light?
If 4.50 moles of C2H6 undergoes combustion, how many moles of oxygen would it combust with?
Answer:
First balance the equation
C2H6 + 7/2O2 2CO2 +3H2O
for one mole of C2H6 there are 7/2 mole of O2 required. so for4.50 moles you require 4.50 x 7/2 = 15.75 moles of O2.
Explanation:
How is neutrophilia defined?