what is the electrolysis of water
Which of the following is a metal?
a.
silicon, Si, Z = 14
b.
phosphorus, P, Z = 15
c.
thallium, Tl, Z = 81
d.
arsenic, Z = 33
e.
nitrogen, N, Z = 7
Answer:
A.................. I think the answer
Which is a reason to use rate laws?
A. to investigate how the pressure of liquids affects reaction rates
B. to find the new rate when the concentration of reactants changes
C. to calculate the molecular weight of compounds in a reaction
D. to find the number of moles of solute that are dissolved in 1 L of solution
Answer:
B
Explanation:
to find the new rate when the concentration of reactants changes
solution with low concentration of hydrogen ions have a __________ ph .
Answer:
6.37
Explanation:
Answer:
high ph
Explanation:
if you have high conc of H+ ph is low therefore acidic but if vice versa basic
high ph
What volume will 1.27 moles of helium gas occupy at 80.00 °C and 1.00 atm?
Pls and thank you :) !
Answer:
36.8 L
Explanation:
We'll begin by converting 80 °C to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
T(°C) = 80 °C
T(K) = 80 + 273
T(K) = 353 K
Finally, we shall determine the volume occupied by the helium gas. This can be obtained as follow:
Number of mole (n) = 1.27 moles
Temperature (T) = 353 K
Pressure (P) = 1 atm
Gas constant (R) = 0.0821 atm.L/Kmol
Volume (V) =?
PV = nRT
1 × V = 1.27 × 0.0821 × 353
V = 36.8 L
Thus, the volume occupied by the helium gas is 36.8 L
Combine terms: 12a + 26b -4b – 16a.
Answer:
= -4a+22b
Explanation:
i hope this helps :)
Answer:
12a-16a =-4a
26b -4b =22b
the final answer is-4a +22b
Consider a buffer made by adding 132.8 g of NaC₇H₅O₂ to 300.0 mL of 1.17 M HC₇H₅O₂ (Ka = 6.3 x 10⁻⁵) What is the pH of this buffer?
Answer:
pH = 1.62
Explanation:
We can solve this problem using Henderson-Hasselbach's equation:
pH = pKa + log[tex]\frac{[A^-]}{[HA]}[/tex]Where
pKa = -log(Ka) = 4.20[A⁻] = [NaC₇H₅O₂][HA] = [HC₇H₅O₂]Now we convert 132.8 g of NaC₇H₅O₂ into moles, using its molar mass:
132.8 ÷ 144.11 g/mol = 0.921 molesThen we calculate [NaC₇H₅O₂]:
0.921 moles / 300.0 mL = 0.003 MNow we can proceed to calculate the pH of the solution:
pH = 4.20 + log[tex]\frac{0.003}{1.17}[/tex]pH = 1.62i need help help me please
Answer:
C is the correct answer.
Explanation:
We can eliminate some answers immediately:
A is incorrect because nitrogen and hydrogen do not change their identity, they just combine into a new molecule that contains them. Notice how there are 2 nitrogen atoms and 6 hydrogen atoms on both sides of the equation.
B is incorrect because the first law of thermodynamics tells us that matter and energy will always be conserved, so the mass of the products must be equal to the mass of the reactants, not less than the mass of the reactants.
C is correct because balanced chemical equations help chemists predict how much product will form from certain amounts of reactants.
D is incorrect because this equation is showing the exact opposite. Molecular hydrogen and nitrogen can combine stoichiometrically to form ammonia.
14.3 moles of methane (CH4) burns completely, find the grams of H20 would be produced CH4 + 202 CO2 + 2H20 w
Answer:
514.8 grams of H₂O would be produced.
Explanation:
The balanced reaction is:
CH₄ + 2 O₂ → CO₂ + 2 H₂O
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles participate in the reaction:
CH₄: 1 mole O₂: 2 molesCO₂: 1 mole H₂O: 2 molesBeing the molar mass of each compound:
CH₄: 16 g/moleO₂: 32 g/moleCO₂: 44 g/mole H₂O: 18 g/moleBy stoichiometry, the following amounts of mass participate in the reaction:
CH₄: 1 mole* 16 g/mole= 16 gramsO₂: 2 moles* 32 g/mole= 64 gramsCO₂: 1 mole* 44 g/mole= 44 gramsH₂O: 2 moles* 18 g/mole= 36 gramsYou can apply the following rule of three: if 1 mole of methane produces 36 grams of water, 14.3 moles of methane produces how much mass of water?
[tex]mass of water=\frac{14.3 moles of methane*36 grams of water}{1 mole of methane}[/tex]
mass of water= 514.8 grams
514.8 grams of H₂O would be produced.
Students can demonstrate reflection by doing which of the following?
A Warming metal under a heat lamp.
B. Observing their own image in still water.
C. Enlarging an image using a hand lens.
0
D. Measuring a shadow made by the Sun.
Answer:
a
Explanation:
6.3x10-5M. What is the pH?
Answer:
https://sensorex.com/ph-calculator/
Explanation:
go to this link and then scroll down a little bit and then you'll find the answer
Why are diamonds unevenly distributed on Earth?
Soil forms only in places where rock particles are deposited.
Soil forms only in places where larger rocks are broken into smaller rocks.
Soil forms only within the Earth under heavy pressure.
Soil forms in the air and is then deposited mainly in places that get a lot of rain.
Answer:
Why aren't diamonds found evenly distributed on Earth? Diamonds are only formed under specific conditions that involve geological processes, such as volcanic activities and plate movements. Since these conditions and processes only take place in certain areas, you can only find diamonds in these special places.
Explanation:
Determine the mass and weight of the air in your living room at 20°C ; the room has the following dimensions ;4m ×5m floor and ceiling is at 3m height. Take the density of the air as
Answer:
Volume of air is [tex]60[/tex] cubic meter
Mass of air is [tex]72.246[/tex] Kilogram
Explanation:
As air occupies the volume of the container in which it is kept. The volume of air here in this case will be equal to the volume of the room.
Volume of the room = length * breadth * height
Volume of the room = [tex]4*5*3 = 60[/tex] cubic meter.
Volume of air is also [tex]60[/tex] cubic meter.
Density of air at 20 degrees C [tex]= 1.2041[/tex] kg/cu.m
Mass of air
Volume * density
[tex]60 * 1.2041 = 72.246[/tex] kilogram
Volume of air is [tex]60[/tex] cubic meter
Mass of air is [tex]72.246[/tex] Kilogram
1 Write the chemical symbols for following elements: Nitrogen-
Phosphorus- bromine- Zinc-Potassium-Magnesium.
Answer:
I think
Explanation:
N for nitrogen
P for phosphorus
Br for bromine
K for potassium
Mg for magnesium
Part A
How many moles of chlorine gas are needed to make 0.6 moles of sodium chloride?
Given the reaction: 2Na + Cl2 + 2NaCl
O 1.2
O 0.6
0 3.6
O 0.3
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Answer:
[tex]n_{Cl_2}=0.3molCl_2[/tex]
Explanation:
Hello there!
In this case, according to the given chemical reaction whereas the sodium chloride is in a 2:1 mole ratio with chlorine, the required moles of the later are computed as shown below:
[tex]n_{Cl_2}=0.6molNaCl*\frac{1molCl_2}{2molNaCl}[/tex]
So we cancel out the moles of NaCl to obtain:
[tex]n_{Cl_2}=0.3molCl_2[/tex]
Best regards!
the desity of gold is 19.3 g/cm3. what is the volume of a 13 g gold nugget .
Answer:
0.67 cm³
Explanation:
We can solve this problem by using the definition of density:
Density = Mass / VolumeWe can rearrange the equation and isolate volume:
Volume = Mass / DensityAs we are given both the mass and the density, we can now calculate the volume:
Volume = 13 g ÷ 19.3 g/cm³Volume = 0.67 cm³Use the following chemical equation, how many moles of ammonia (NH 3 ) produced when 3.15 moles of nitrogen (N 2 ) reacts with hydrogen (H 2 ) ? N 2(g) + 3H 2(g) 2NH 3(g)
Answer:
[tex]n_{NH_3}^{produced}=6.3molNH_3[/tex]
Explanation:
Hello there!
In this case, according to the given chemical reaction, it is possible for us to use the 1:2 mole ratio of nitrogen to ammonia to calculate the moles of the latter that are produced when reacting 3.15 moles of the former with hydrogen as shown below:
[tex]n_{NH_3}^{produced}=3.15molN_2*\frac{2molNH_3}{1molN_2}[/tex]
Thus, by solving the equation we obtain:
[tex]n_{NH_3}^{produced}=6.3molNH_3[/tex]
Best regards!
A sample of 0.0255 mol potassium hydroxide, KOH, was dissolved in water to yield
10.0 mL of solution. What is the molarity of the solution?
According to molar concentration, the molarity of the solution is 2.55 M.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
Substituting values in the given second formula, molarity=0.0255/0.010=2.55 M.
Thus, the molar concentration of the solution is 2.55 M.
Learn more about molar concentration,here:
https://brainly.com/question/21841645
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Which of the following is NOT a benefit of strength training? WILL GIVE BRAINLIEST! :)
A. Better control of muscle
B. More efficient movement
C. Decreased force variance
D. Increased flexibility
I think it's D
Explanation:
if you think abt it strength training means weights and stuff so I dont think it increases flexibility. it's that or letter C
Silver sulfate dissociates into silver ions and sulfate ions:
Ag2SO4(s) = 2Ag+ (aq) + SO42- (aq)
Which of the following equations is the equilibrium constant expression for
this reaction?
A. Kot
[Ag+][80.21
[Ag 2504)
O B. Ko = [Ag+ 12 [5042")
[A92504)
O C. KE =
[Ag+1?[s042-7
O D. KG
[A92504
[Ag+ ][5042-)
Answer:
A its a step by step equation the answer is A
When i make an account for different college can I use the same email username for each one or do I have make a different username email
Answer:
No you have to use a new email unless you delete the other accaount
Explanation:
hope that helps
What is the frequency of a light source that has a wavelength of 430 NM? What is the energy of this wave?
Answer:
Explanation:
[tex]c = f \lambda[/tex]
where c = speed of light (3x10^8m/s)
f = frequency
[tex]\lambda[/tex] = wavelength.
We can solve that the frequency is (3x10^8)/(420 x 10^-9) = 7.14x10^14 Hz
Also, E = hf where h = 6.62x10^-34.
So the energy is (6.62x10^-34) x (7.14x10^14) = 4.73x10^-19 J.
Hope this helps and tell me if I made any mistakes.
Your teacher gives you 0.09 L of a 0.850 M solution of NaCl dissolved in water. What will the new volume be if you dilute it down to 0.500 M?
Answer:
[tex]V_2=0.153L[/tex]
Explanation:
Hey there!
In this case, according to the equation for dilution process, in which the moles of the solute remain the same after the addition of additional solvent:
[tex]M_1V_1=M_2V_2[/tex]
Thus, by solving for the new volume, V2, of the base, NaOH, we can obtain:
[tex]V_2=\frac{M_1V_1}{M_2}=\frac{0.09L*0.850M}{0.500M}\\\\V_2=0.153L[/tex]
Best regards!
A motorcycle that travels north 201m in 7s. What is it's velocity?
7. D=
8. TE
9. V=
What is the vapor pressure of an aqueous solution that has a solute mole fraction of 0.1000? The vapor pressure of water is 25.756 mmHg at 25 °C.
Answer:
χsolvent = 1.0000 - 0.1000 = 0.9000
Use Raoult's Law:
Psolution = (χsolvent) (P°solvent)
x = (0.900) (25.756)
x = 23.18 mmHg (to four sig figs)
The vapor pressure of an aqueous solution is x = 23.18 mmHg (to four sig figs)
χsolvent = 1.0000 - 0.1000 = 0.9000
Use Raoult's Law:
P solution = (χsolvent) (P°solvent)
x = (0.900) (25.756)
x = 23.18 mmHg (to four sig figs)
What is an aqueous solution?An aqueous answer is one in which the solvent is liquid water. that is, solute (dissolved) ions and molecules are surrounded by water molecules and integrated into the network of bonds within the water. The dissolved species then spread in the course of the water.
A solution wherein water is the solvent is called an aqueous solution. although water is an exceptional solvent, now not the whole thing dissolves comfortably in the water.
Aqueous' in a chemical equation suggests that the cloth dispersed in water (an answer in water). As an example, when we pour sodium hydroxide answer into dilute hydrochloric acid, we get an aqueous solution of sodium chloride. The liquid is used to signify the formation of liquid materials in response.
Learn more about the aqueous solution here: https://brainly.com/question/19587902
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What is the molarity of a 9.79 L solution that contains 0.400 mol HCI
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
If 2.00 moles of H2 and 1.55 moles of Oz react how many moles of H20
can be produced in the reaction below?
2 H2(g) + O2(g) → 2 H2O(g)
What is the correct coefficient for Fe2O3 in the balanced version of the following equation?
Fe2O3 + 3H2 → 2Fe + 3H2O
__Fe2O3+3H2→2Fe+3H2O
Answer:
The coefficient of Fe₂O₃ is 1
Explanation:
__Fe₂O₃ + 3H₂ —> 2Fe + 3H₂O
To know the correct coefficient of Fe₂O₃, we shall balanced the equation. This can be obtained as follow:
Fe₂O₃ + H₂ —> Fe + H₂O
There are 2 atoms of Fe on the left side and 1 atom on right side. It can be balance by writing 2 before Fe as shown below:
Fe₂O₃ + H₂ —> 2Fe + H₂O
There are 3 atoms of O on the left side and 1 atom on the right side. It can be balance by writing 3 before H₂O as shown below:
Fe₂O₃ + H₂ —> 2Fe + 3H₂O
There are 2 atoms of H on the left side and 6 atoms on the right side. It can be balance by writing 3 before H₂ as shown below:
Fe₂O₃ + 3H₂ —> 2Fe + 3H₂O
Now, the equation is balanced.
Thus, the coefficient of Fe₂O₃ is 1
Try moving an electron from the metal to the non metal.What happens?
Answer:
Sodium becomes a positive ion and chlorine becomes a negative ion. ... Each atom is neutrally charged, which means that each atom has the same number of protons and electrons.
Explanation:
How many grams of water can be heated from 15.0°C to 75°C using 12,500 Joules?
Answer:
m = 49.8 g
Explanation:
Hello there!
In this case, for this calorimetry processes we can define the involved heat in terms of mass, specific heat and temperature as shown below:
[tex]Q=mC\Delta T[/tex]
Thus, given the heat, final and initial temperature and specific heat of water (4.184), the mass of water can be computed as shown below:
[tex]m=\frac{Q}{C\Delta T}\\\\m=\frac{12500J}{4.184\frac{J}{g\°C}(75\°C-15.0\°C)} \\\\m=49.8g[/tex]
Best regards!