What is [H30+] in a solution with a pH of 10.4?
Answer:
(H30+) = 3,98 x10 ^-11 M
Explanation:
The pH gives us an idea of the acidity or basicity of a solution. More precisely, it indicates the concentration of H30 + ions present in said solution. The pH scale ranges from 0 to 14: from 0 to 7 corresponds to acid solutions, 7 neutral solutions and between 7 and 14 basic solutions. It is calculated as:
pH = -log (H30 +)
We solve (H30+) and calculate:
(H30+) = antilog - pH
(H30+) = antilog - 10.4
(H30+) = 3,98 x10 ^-11 M
Increasing the mass of an object will... *
Answer:
Increasing the mass of an object will decrease the acceleration, because of Newton's Second Law (the acceleration of an object increases with increased force, decreases with increased mass, and moves the same direction as the force).
A magnet moved near a coil of wire can cause a(n)
to flow.
A. electric current
B.protons
c. magnetic field
D.neutrons
Answer:
A magnet moved near a coil of wire can cause a(n) electric current to flow. (The magnet's magnetic field also moves.)
Explanation:
The answer is A.
Which of the following describes the stage that occurs after evaporation in the water cycle?
A.
precipitation
B.
radiation
C.
condensation
D.
respiration
In the water cycle, the stage following evaporation is condensation. This process involves water transforming from a gas back into a liquid form in the atmosphere, eventually leading to precipitation.
Explanation:In the water cycle, the stage that occurs after evaporation is condensation. After water evaporates from the earth's surface, it rises into the atmosphere where cooling temperatures cause it to change from a gas (steam) back into a liquid form, creating clouds.
This is the process of condensation. It's important to note that the water cycle is a continual process, and after condensation, the cycle usually moves on to precipitation, where the condensed water falls back to the earth as rain, sleet, or snow.
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What is the mass of 1.72 moles of BaSO4?
Answer: 401.4g
Explanation:
The mass can be calculated by using the following mathematical expression for Moles ,which is:
Moles = Mass / Molar Mass
From the question given, Moles = 1.72, Molar mass of BaSO4 = 233.38g/mol, Mass =?
Making 'Mass' the subject of formula, we get:
Mass = Molar mass x Moles
= 233.38 x 1.72 = 401.4g
Calculate the energy in joules. 245 Calories = _
joules
Answer:
1025.08
Explanation:
Answer:
1.025e+6 joules
Explanation:
A student conducting a calorimetry investigation determines a negative ∆H. What does the negative value indicate about the reaction?
Answer : The negative value indicate about the reaction is exothermic and heat is released.
Explanation :
Enthalpy of a reaction (ΔH): It is defined as the energy change that takes place during the chemical processes. It is represented as, ΔH.
If the heat is absorbed during the chemical process then the enthalpy of reaction is positive.
If the heat is released during the chemical process then the enthalpy of reaction is negative.
That means,
When the value of enthalpy of reaction is negative then the heat is released and the reaction will be exothermic reaction.
When the value of enthalpy of reaction is positive then the heat is absorbed and the reaction will be endothermic reaction.
Final answer:
A negative ∆H in calorimetry signifies an exothermic reaction where heat is released by the system to the surroundings.
Explanation:
A negative ∆H in a calorimetry investigation indicates that the reaction is exothermic, meaning heat is released by the system to the surroundings.
For example, if the enthalpy change is negative in the combustion of methane, it signifies that heat is being given off by the system.
In calorimetry, negative ∆H values represent energy being transferred from the system to its surroundings in exothermic reactions.
At 60 Celsius , 123 grams of NaNO3 is dissolved in 100 grams of water. What is the Molarity of this solution?
Answer:
CHAPTER 17
PROPERTIES OF SOLUTIONS
Solution Composition
12. Mass percent: the percent by mass of the solute in the solution.
Mole fraction: the ratio of the number of moles of a given component to the total number of
moles of solution.
Molarity: the number of moles of solute per liter of solution.
Molality: the number of moles of solute per kilogram of solvent.
Volume is temperature-dependent, whereas mass and the number of moles are not. Only
molarity has a volume term, so only molarity is temperature-dependent.
13. a. HNO3(l) → H+
(aq) + NO3
−
(aq) b. Na2SO4(s) → 2 Na+
(aq) + SO4
2−
(aq)
c. Al(NO3)3(s) → Al3+(aq) + 3 NO3
−
(aq) d. SrBr2(s) → Sr2+(aq) + 2 Br−
(aq)
e. KClO4(s) → K+
(aq) + ClO4
−
(aq) f. NH4Br(s) → NH4
+
(aq) + Br−
(aq)
g. NH4NO3(s) → NH4
+
(aq) + NO3
−
(aq) h. CuSO4(s) → Cu2+(aq) + SO4
2−
(aq)
i. NaOH(s) → Na+
(aq) + OH−
(aq)
14. Mol Na2CO3 = 0.0700 L ×
L
3.0 mol Na 2CO3 = 0.21 mol Na2CO3
Na2CO3(s) → 2 Na+
(aq) + CO3
2−
(aq); mol Na+
= 2(0.21) = 0.42 mol
Mol NaHCO3 = 0.0300 L ×
L
1.0 mol NaHCO3 = 0.030 mol NaHCO3
NaHCO3(s) → Na+
(aq) + HCO3
−
Which element is represented by a bohr model with one electron
What volume would 4.3 moles of hydrogen gas occupy at 45° C and 3.22 atm?
Answer:
34.8 L of hydrogen gas
Explanation:
Now we have to use the ideal gas equation;
PV= nRT
P= pressure of the gas= 3.22atm
V= volume of the gas = ?????
T= temperature of the gas = 45°C +273= 318K
n= number of moles =4.3 moles
R= universal gas constant= 0.082atm Lmol-1K-1
Making V the subject of the formula
V= nRT/P
V= 4.3×0.082×318/3.22
V= 34.8 L
Answer:
34.82 L
Explanation:
Step 1:
Data obtained from the question:
Number of mole (n) = 4.3 mole
Temperature (T) = 45°C = 45°C +273 = 318K
Pressure (P) = 3.22 atm
Volume (V) =?
Step 2:
Determination of the volume hydrogen gas.
With the application of the ideal gas equation, the volume of Hydrogen gas can be obtained as follow:
Note that the gas constant (R) = 0.082atm.L/Kmol
PV = nRT
3.22 x V = 4.3 x 0.082 x 318
Divide both side by 3.22
V = (4.3 x 0.082 x 318) /3.22
V = 34.82 L
Therefore the volume occupied by the hydrogen gas is 34.82 L
What size volumetric flask would you use to create 1.50 M
solution using 43.85 g of NaCl?
The size of volumetric flask is 0.5L = 500mL
Explanation:
In order to estimate the concentration of a solution in molarity, then the total number of moles of the solute is divided by the total volume of the solution.
Molarity of a solution is given by;
[tex]M= \frac{n}{V}[/tex]
Where;
n= number of moles of solute
V= volume of solution = size of volumetric flask
[tex]n=\frac{m }{ m.m}[/tex]
Where;
m= mass of solute=43.85g
m.m= molar mass of solute=58.5g
Note that solute is NaCl(s)
[tex]n=\frac{43.85}{58.5}=0.75mol[/tex]
We know that the molarity is 1.50M
To find the size of the volumetric flask, we make V in M=n/V subject of formula
[tex]V=\frac{n}{M}[/tex]
[tex]V=\frac{0.75}{1.50}[/tex]
[tex]V=0.5[/tex]
Therefore, the size of volumetric flask is 0.5L = 500mL.
Final answer:
To prepare a 1.50 M NaCl solution using 43.85 g of NaCl, calculate the moles of NaCl and then divide by the desired molarity, resulting in a volume of 0.500 liters. Therefore, a 500 mL volumetric flask should be used.
Explanation:
To determine what size volumetric flask is needed to create a 1.50 M solution using 43.85 g of NaCl, we first need to calculate the amount of solvent required to achieve this molarity. The molar mass of sodium chloride (NaCl) is approximately 58.44 g/mol. To find the number of moles in 43.85 g of NaCl, we divide the mass by the molar mass:
moles of NaCl = 43.85 g / 58.44 g/mol = 0.750 moles
Next, we use the formula for molarity (M), which is moles of solute (n) divided by liters of solution (V). Since we want a 1.50 M solution:
1.50 M = 0.750 moles / V (liters)
Solving for V gives us:
V = 0.750 moles / 1.50 M = 0.500 liters
Thus, a 500 mL volumetric flask is appropriate to prepare this solution, ensuring the final volume accounts for the added volume after the solute has dissolved.
which gas law holds pressure constant ???? HELP
Answer:
Boyle's Law
Explanation:
It's Boyle's law because, for a fixed mass of a perfect gas remaining at a fixed temperature ,pressure and volume are inversely correspondent . Boyle's law is a gas law, that states that pressure and volume of a gas has an inverse relationship . So, if the volume of the gas increases then,the pressure will decrease and vice versa , when temperature is held constant.
How many joules (J) are needed to increase the temperature of 10.0 g of lead (Pb) from 30 ˚C to 50 ˚C? (Cp for Pb = 0.128 J/g˚C)
25.6 J
38.4 J
64.0 J
102.4 J
Answer:
Q = 25.6 j
Explanation:
Given data:
Energy needed= ?
Mass of lead = 10.0 g
Initial temperature = 30 °C
Final temperature = 50°C
Cp = 0.128 j/g.°C
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 50°C - 30°C
ΔT = 20°C
Now we will put the values in formula.
Q = 10 g × 0.128 j/g.°C × 20°C
Q = 25.6 j
Helppppppppppp please
Answer:
1. Option(1) 3
2. Option (2) 1/2
Explanation:
1. We'll begin by obtaining the molar mass of H3PO4. This is illustrated below:
Molar Mass of H3PO4 = (3x1) + 31 + (16x4) = 3 + 31 + 64 = 98g/mol
Mass of H in H3PO4 = 3x1 = 3g
The percentage by mass of H in H3PO4 given by:
Mass of H in H3PO4/Molar Mass of H3PO4 x 100
=> 3/98 x 100
=> 3
2. Atoms present in H3PO4 are given below:
H = 3 atoms
P = 1 atom
O = 4 atoms
Total = 8 atoms
The fraction of oxygen atom in H3PO4 is given by:
=> Atom of O/total atoms
=> 4/8
=> 1/2
Consider the following three-step reaction pathway.
Step 1: (CH3)3AUPH3 → (CH3)3Au + PH3 (fast)
Step 2: (CH3)3Au → (CH3)Au + C2H6 (slow)
Step 3: (CH3)Au + PH3 – (CH3)AuPH3 (fast)
Which is the correct list of reaction intermediates from the reaction pathway above?
A.) (CH3)3AuPH3, (CH3)3Au, and (CH3)Au
B.) PH3 and (CH3)Au
C.) (CH3)3AUPH3 and C2H6
D.) PH3, (CH3)3Au, and (CH3)Au
Final answer:
The correct list of reaction intermediates is A)(CH3)3AuPH3, (CH3)3Au, and (CH3)Au.
Explanation:
The correct list of reaction intermediates from the given reaction pathway is:
A)(CH3)3AuPH3
,
(CH3)3Au
, and
(CH3)Au
This can be determined by examining the steps of the reaction pathway. In step 1, (CH3)3AUPH3 is converted into (CH3)3Au and PH3. In step 2, (CH3)3Au reacts to form (CH3)Au and C2H6. Finally, in step 3, (CH3)Au reacts with PH3 to form (CH3)AuPH3. Therefore, the intermediates are (CH3)3AuPH3, (CH3)3Au, and (CH3)Au.
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In the provided chemical reaction pathway, the intermediates are (CH3)3Au and (CH3)Au as they are produced in a step and consumed in a later step. This makes option D correct.
Explanation:In a chemical reaction, intermediates are substances that form during the reaction but are consumed before it's completed. Here, judging from the three-step reaction pathway you've been provided:
Step 1: (CH3)3AUPH3 → (CH3)3Au + PH3 (fast) Step 2: (CH3)3Au → (CH3)Au + C2H6 (slow) Step 3: (CH3)Au + PH3 → (CH3)AuPH3 (fast)
The intermediates can be identified as the molecules that are produced in one step and consumed in a later step. Based on this, the correct list of reaction intermediates from this reaction pathway is (CH3)3Au, because it is produced in step 1 and consumed in step 2 and (CH3)Au, because it is produced in step 2 and consumed in step 3. So, option D.) PH3, (CH3)3Au, and (CH3)Au is correct.
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Determine how many significant figures are in each measurement.(9pts)
0.0908
340.02
5420
12.90
3.09 x 108
0.79
0.02050
0.009
4709
Final answer:
In Chemistry, significant figures represent precision in measurements. The number of significant figures varies for each measurement based on the rules of counting significant figures, considering zeros as either placekeepers or significant values.
Explanation:
The subject of this question is Chemistry, particularly focusing on significant figures which are crucial for representing precision in measurements. Let's determine the number of significant figures in each given measurement using the rules for counting significant figures:
0.0908 has three significant figures (leading zeros are not significant).
340.02 has five significant figures (zeros between non-zero digits are significant).
5420 has three significant figures, assuming the last zero is not significant unless otherwise stated (if in scientific notation, it would clarify).
12.90 has four significant figures (trailing zeros in a decimal are significant).
3.09 x 10^8 has three significant figures (all digits in the coefficient are significant).
0.79 has two significant figures (leading zeros are not significant).
0.02050 has four significant figures (trailing zeros in a decimal number are significant).
0.009 has one significant figure (leading zeros are not significant).
4709 has four significant figures (all non-zero digits are significant).
What type of reactions require energy in order to start?
Answer:
Endergonic reactions
Explanation:
The terms endergonic and exergonic describe reactions in terms of the energy transfer. Because ender = in, exo = out, we can tell that endergonic reactions need energy put in, and exergonic don't need energy put in, they release energy!
An atom is said to be in an excited state when it possesses more energy than when it is in its
ground state.
True or false?
Answer:
True!
Explanation:
10 POINT
I WILL MARK BRANLIEST PLSS HELP
Plants have played a role in affecting the Earth system by:
I. changing the composition of the atmosphere
II. changing the quality of the soil
III. weathering rocks
IV. altering the length of a day
A.
II and IV only
B.
I, II, and III only
C.
III and IV only
D.
I only
The volume of any gas is dependent on what three variables? *
The volume of a gas is dependent on:
1. Pressure
2. Temperature
3. Amount of gas.
Is there DNA in prokaryotic cells?
Answer:
Prokaryotic are unicellular organisms that lack organelles or other internal membrane-bound structures. Therefore, they do not have a nucleus, but, instead, generally have a single chromosome: a piece of circular, double-stranded DNA located in an area of the cell called the nucleotide.
Explanation:
5. Which of the following identifies an element?|
a. proton
C. electron
b. neutron
d. antineutrino
a, proton following identifies an element
The number of protons identifies an element. Therefore, option A is correct.
What easily identifies an element?The atomic number is used to identify an element, and it is the number of protons in an element's nuclei. Every element has a distinct number of protons, and thus an atomic number.
Electron configuration, atomic size, ionization energy, electron affinity, and electronegativity are atomic properties that are critical to element behavior.
The atomic number is the number of protons in the nucleus of an atom. The number of protons defines the identity of an element.
The number of protons in an element is the only way to identify it; the number of neutrons and electrons can vary without changing the element's identity.
Thus, The number of protons identifies an element, option A is correct.
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a gas is at a pressure of 12.5psi and a volume of 750mL. What volume will the gas occupy at a pressure of 18psi?
Answer:
520.8 mL
Explanation:
We can solve this problem by using Boyle's Law, which states that:
"For a fixed mass of an ideal gas kept at constant temperature, the pressure of the gas is inversely proportional to its volume"
Mathematically:
[tex]p\propto \frac{1}{V}[/tex]
where
p is the pressure
V is the volume
We can rewrite the equation as
[tex]p_1 V_1 = p_2 V_2[/tex]
where here:
[tex]p_1=12.5 psi[/tex] is the initial pressure of the gas
[tex]V_1=750 mL[/tex] is the initial volume
[tex]p_2=18 psi[/tex] is the final pressure
And solving for V2, we find the final volume of the gas:
[tex]V_2=\frac{p_1 V_1}{p_2}=\frac{(12.5)(750)}{18}=520.8 mL[/tex]
how many grams of calcium fluoride contain 38 grams of fluoride atoms
What is the volume, to the nearest whole cubic inch, of a cylinder with a height of 10 inches and a radius of 8 inches? Use Pi = 3.14 and round your answer to the whole number.
cubic inches
Answer:
v=2010 inches^3
Explanation:
The volume of a cylinder can be found using:
[tex]v=\pi r^2h[/tex]
We know the height is 10, the radius is 8, and we can substitute 3.14 in for pi
v=3.14(8^2)(10)
Solve the exponent first
v=3.14(64)(10)
v=3.14(640)
v=2009.6
To the nearest whole number:
v=2010 inches^3
what type of reaction is sodium reacting with chlorine
Answer:
combination reaction
Explanation:
i'm not sure i just searched it on the internet
Answer:
Combination reaction
Explanation:
When sodium reacts with chlorine
It is known to be combination reaction because they will combine to give a specific compound
That is,Na+Cl=NaCl
And the bond formed between them is ionic bond
How much energy is required to vaporize 2 kg of aluminum? Use the table
below and this equation: Q = mLvapor
Substance
Latent Heat
Fusion
(melting)
(kJ/kg)
Melting
Point
(°C)
Latent Heat
Vaporization
(boiling) (kJ/kg)
Boiling
Point
(°C)
Aluminum
400
660
1100
2450
Copper
207
1083
4780
2566
Gold
628
1063
1720
2808
Helium
5.2
-270
21
-269
Lead
245
327
871
1751
Mercury
11.4
-39
296
357
Water
335
0
2256
100
Answer:
2000
Explanation:
it is verified by scientists
3440 kJ is the energy that is required to vaporize 2 kg of aluminum. The elemental source of energy upon earth is said to be the sun.
What is energy?On earth, energy comes in a variety of ways. The elemental source of energy upon earth is said to be the sun. Energy is seen as a quantifiable property in physics that may be transferred form an item to carry out work. Thus, we might characterise energy as the capacity to engage in any sort of physical action. So, to put it simply, we may describe energy as:
The capacity to perform work is energy. Energy "can neither be created neither destroyed but must instead be converted forms one form to another," according to the rules of conservation of energy. The SI unit for energy is called a joule.
Q = m× Lvapor
=m×293.4 kJ/mol
=3440 kJ
Therefore, 3440 kJ is the energy that is required to vaporize 2 kg of aluminum.
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While waiting for your car to warm up one winter morning, you notice a liquid dripping from your tailpipe. You recently
learned in chemistry class that combustion reactions occur in car engines. The liquid dripping from your tailpipe is, therefore,
a product of this combustion.
What is the identity of the liquid?
A)
Methanol
B)
Octane
Propane
Water
Answer:
A
Explanation:
Menthol (M 156.3 g/mol), the strong-smelling substance in many cough drops, is a compound of carbon, hydrogen, and oxygen. When 0.1595 g of menthol was bunted in a combustion apparatus. 0.449 g of CO_2 and 0.184 g of H_2 O formed.
What are starches and sugars in the cell known as?
Answer:
The answer is 3rd option.
Explanation:
Lipid is a liquid form of fat
Protein is not a sugar or starch solution.
Carbohydates is a large and complex molecules in a form of sugar.
What is the pOH of the solution?
The pOH of the solution is 8.
What is pOH?
pOH is a measure of the hydroxide ion concentration in a solution, reflecting its alkalinity. It is calculated as the negative logarithm of the hydroxide ion concentration. The pOH scale complements the pH scale, which measures the hydrogen ion concentration, and together they provide a comprehensive view of a solution's acid-base balance.
We know that;
pOH = - log[OH-]
pOH = -log[9.5 *[tex]10^{-9[/tex]]
pOH = 8