The coefficients, in order of the blanks, are 5, 2, 5, 2, 4.
Which of the following does half-life measure? Question 2 options: gamma emission beta emission alpha emission radioactive decay rate
Answer:
b because the detective ate coffee all day
Which of the following has the greatest influence on the size and force of waves?
A.
seasons
B.
Moon’s gravity
C.
wind speed
D.
Earth’s gravity
definition of compounds
what is the formula for chlorine monobromide
Based on how to wrire chemical formulae, the formula for chlorine monobromide is BrCl.
What is chlorine mononbromide?Chlorine monobromide is a covalent compound formed from the covalent combination of chlorine and bromine.
The covalent bond is formed from the sharing of electrons between atoms chlorine and bromine.
Br2 + Cl2 ---> 2 BrCl
Tye formula of chlorinr monobromide is BrCl.
It is also known as bromine monochloride.
Therefore, the formula for chlorine monobromide is BrCl.
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What are the correct formulas and coefficients for the product of the following double-displacement reaction? K3PO4 + CaCl2 ->
Answer:
Option 2: 6KCl + Ca₃(PO₄)₂
Explanation:
K₃PO₄ + CaCl₂ → Ca₃(PO₄)₂ + KCl
Balancing the equation,
2K₃PO₄ + 3CaCl₂ → Ca₃(PO₄)₂ + 6KCl
∴ the correct formula and coefficients of the products in the equation are,
6KCl + Ca₃(PO₄)₂
1.A sample of gas in a closed container occupies 250. mL at 1.25 atm of pressure. If the pressure increases to 2.00 atm while the temperature stays the same, what is the new volume in mL?
2.A sample of gas is held inside a flexible container where pressure is kept constant. At room temperature (21.1ºC), the container has a volume of 1.50 L. What is the volume of the gas if the container is placed in a deep freezer at -10.0ºC?
3.A sample gas is held inside a rigid container with a pressure of 50. kPa and a temperature of 290 K. What is the new temperature of the gas if the pressure is doubled?
Answer:
Una cantidad de gas ocupa un volumen de 80 cm3
a una presión de 750 mm Hg. ¿Qué volumen
ocupará a una presión de 1,2 atm.si la temperatura no cambia?
Explanation:
El volumen inicial de una cierta cantidad de gas es de 200 cm3
a la temperatura de 20ºC. Calcula el
volumen a 90ºC si la presión permanece constante.
What is the pH of 4.3x10^-7 M solution of H2CO3?
A.)7
B.)4.3
C.)6.4
D.)7.6
ASAP PLS
Answer:
pH = -log[H⁺] = -log(4.75 x 10⁻⁷) = -(- 6.32 ) = 6.32
Explanation:
Given 4.3 x 10⁻⁷M H₂CO₃ (Ka1 = 4.2 x 10⁻⁷ & Ka2 = 4.8 x 10⁻¹¹)
Note: The Ka2 value for the 2nd ionization step is so small (Ka2 = 4.8 x 10⁻¹¹) It will be assumed all of the hydronium ions (H⁺) come from the 1st ionization step.
1st Ionization step
H₂CO₃ ⇄ H⁺ + HCO₃⁻
C(initial) 4.3 x 10⁻⁷ 0 0
ΔC -x +x +x
C(final) 4.3 x 10⁻⁷ - x x x
Note: the 'x' value in this analysis can not be dropped as the Conc/Ka value is less than 10². In this case he C/Ka ratio* (4.3E-7/4.2E-7 ≈ 1) is far below 10².
So, one sets up the equilibrium equation to be quadric and the x-value can be determined.
Ka1 = [H⁺][HSO⁻]/[H₂SO₃] = (x)(x)/(4.3 x 10⁻ - x) = x²/(4.3 x 10⁻⁷ - x) = 4.2 x 10⁻⁷
=> x² = 4.2 x 10⁻⁷(4.3 x 10⁻⁷ - x)
=> x² + 4.2 x 10⁻⁷x - 1.8 x 10⁻¹³ = 0
a = 1, b = 4.2 x 10⁻⁷, c = - 1.8 x 10⁻¹³
x = b² ± SqrRt(b² - 4(1)(-1.8 x 10⁻¹³ / 2(1) = 4.75 x 10⁻⁷
x = [H⁺] = 4.75 x 10⁻⁷
pH = -log[H⁺] = -log(4.75 x 10⁻⁷) = -(- 6.4 ) = 6.4
______________________
* The Concentration/Ka-value is the simplification test for quadratic equations used in Equilibrium studies. If the C/Ka > 100 then one can simplify the C(final) by dropping the 'x' if used in this type analysis. However, if the C/Ka value is < 100 then the x-value must be retained and the solution is determined using the quadratic equation formula.
for ax² + bx + c = 0
x = b² ± SqrRt(b² - 4ac) / 2a
A balloon is filled with oxygen gas with a volume of 8.70 ML and a temperature of 318.2 K if the temperature increases to 337.8 K what would the new volume be
Answer:
The new volume will be 9.24 mL.
Explanation:
Charles's law determines that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases.
So, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
When studying an initial state 1 and a final state 2, it is satisfied:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
In this case:
V1= 8.70 mLT1= 318.2 KV2= ?T2= 337.8 KReplacing:
[tex]\frac{8.70 mL}{318.2 K} =\frac{V2}{337.8 K}[/tex]
Solving:
[tex]V2=337.8K*\frac{8.70 mL}{318.2 K}[/tex]
V2= 9.24 mL
The new volume will be 9.24 mL.
How many moles are there in 34.5g of calcium phosphate?
What type of substances can we separate using electrolyisis and why?
Answer:
ionic substances because they contain charged particles
What are cilia?
smooth covering
hair like structures
a tail
all of the above
Why do you think Newton’s cradle stops swinging? What does this imply about the energy in the system of pendulums?
What is the pH of a 1.0 L buffer made with 0.300 mol of HF (Ka = 6.8 × 10⁻⁴) and 0.200 mol of NaF to which 0.150 mol of HCl were added
Answer:
pH = 2.21
Explanation:
Hello there!
In this case, according to the reaction between NaF and HCl as the latter is added to the buffer:
[tex]NaF+HCl\rightarrow NaCl+HF[/tex]
It is possible for us to see how more HF is formed as HCl is added and therefore, the capacity of this HF/NaF-buffer is diminished as it turns acid. Therefore, it turns out feasible for us to calculate the consumed moles of NaF and the produced moles of HF due to the change in moles induced by HCl:
[tex]n_{HF}^{new}=0.300mol+0.150mol=0.450mol\\\\n_{NaF}^{new}=0.200mol-0.150mol=0.050mol[/tex]
Next, we calculate the resulting concentrations to further apply the Henderson-Hasselbach equation:
[tex][HF]=\frac{0.450mol}{1.0L} =0.450M[/tex]
[tex][NaF]=\frac{0.050mol}{1.0L} =0.050M[/tex]
Now, calculated the pKa of HF:
[tex]pKa=-log(6.8x10^{-4})=3.17[/tex]
We can proceed to the HH equation:
[tex]pH=pKa+log(\frac{[NaF]}{[HF]} )\\\\pH=3.17+log(\frac{0.05M}{0.45M} )\\\\pH=2.21[/tex]
Best regards!
pH is the measure of the hydrogen or hydronium ion concentration in an aqueous solution. The pH of the buffer made with HF and NaF is 2.21.
What is pH?pH is the measure of the acidic or the basic content in a solution that can be given by the hydrogen or the hydroxide concentration.
The reaction can be shown as,
[tex]\rm NaF + HCl \rightarrow NaCl + HF[/tex]
New moles of HF is 0.300 + 0.150 = 0.450 moles and new moles of NaF is 0.200 - 0.150 = 0.050 moles.
The concentration is calculated by the Henderson-Hasselbach equation:
[tex]\rm [HF] = \dfrac{0.450 \;\rm mol}{1.0 \;\rm L} = 0.450 \;\rm M[/tex]
And,
[tex]\rm [NaF] = \dfrac{0.050\;\rm mol}{1.0 \;\rm L} = 0.050\;\rm M[/tex]
pKa of hydrogen fluoride is calculated as:
[tex]\rm pKa = - log (6.8 \times 10^{-4}) = 3.17[/tex]
The pH from the pKa can be calculated as:
[tex]\begin{aligned}\rm pH &=\rm pKa + log (\dfrac{[NaF]}{[HF]})\\\\&= 3.17 + \rm log (\dfrac{0.05}{0.45})\\\\&= 2.21\end{aligned}[/tex]
Therefore, the pH is 2.21.
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Given the reaction: HNO2 (aq) <-> H+ (aq) + NO2- (aq); write the ionization constant for the reaction.
Answer:
see explanation
Explanation:
HNO₂ ⇄ H⁺ + NO₂⁻
Ka = [H⁺][NO₂⁻]/[HNO₂]
Melissa's mother was making chocolate chip cookies, but told Melissa that she shouldn't eat the raw cookie dough. Why is it unsafe to eat raw dough? -0) A) The dough can kill healthy bacteria in our mouths that help digest food. B) People that are allergic to the ingredients in dough are able to eat it safely after it has been baked. The flour in the dough will rapidly begin to spoil so it isn't safe to eat it until the cookies have been baked. D) Ingredients, such as flour and eggs, that are used to make dough can have bacteria. Baking is a step that kills the bacteria. А A The MAIN difference between terrestrial planets and gas giants is IL
Where are skeletal muscles used? Are they voluntary?
Barium + Aluminum nitrate —> makes what ?
Answer:
Aluminum sulfate with barium nitrate to produce burin and aluminum nitrate
Aluminium hydroxide and barium nitrate are produced as a result of the chemical reaction between barium and aluminium nitrate. The reaction's balanced equation is as follows: [tex]2 Al + 3 Ba (NO_3)_3 \rightarrow 3 Ba(NO_3)_2 + 2 Al(OH)_3[/tex]
Chemical reactions are essential natural processes that take place and are in charge of the innumerable alterations and transformations we experience every day. They include the forming and breaking of chemical bonds between atoms, which causes the atoms to be rearranged to produce new compounds with various properties. The concepts of mass and energy conservation control chemical processes. The idea of balanced chemical equations came about because the total number of atoms of each element involved in a reaction stays constant both before and after the reaction. Aluminium hydroxide and barium nitrate are produced as a result of the chemical reaction between barium and aluminium nitrate. The reaction's balanced equation is as follows: [tex]2 Al + 3 Ba (NO_3)_3 \rightarrow 3 Ba(NO_3)_2 + 2 Al(OH)_3[/tex]
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12. In which equilibrium system will an increase in pressure cause a shift to the left?
A) C + O2(8) + CO2(8)
C) 2 Mg(s) + O2(8) + 2 MgO)
B) CaCO3s) <> CaO + CO2g)
D) 2 H2(g) + O2(g) + 2 H2O)
D is the answer cause two h20 + o2(g)
How does the volume of water change the solubility of sodium chloride in simple words?
Answer:
When sodium chloride dissolves in water to make a saturated solution there is a 2.5 per cent reduction in volume. ... The solubility of salt does not change much with temperature, so there is little profit in using hot water.
Name the following acid: HNO3
Answer:
Nitric Acid
Explanation:
Also known as aqua Fortis and spirt of niter
Hope it helps
Answer:
Nitric Acid
Explanation:
"Nitric acid (HNO3), also known as aqua fortis and spirit of niter, is a highly corrosive mineral acid. The pure compound is colorless, but older samples tend to acquire a yellow cast due to decomposition into oxides of nitrogen and water. Most commercially available nitric acid has a concentration of 68% in water."
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Hope I Helped, Feel free to ask any questions to clarify :)
Have a great day!
More Love, More Peace, Less Hate.
-Aadi x
What is the pH of a solution that contains [OH-]=2.60 x 10-6 M?
Answer:
Explanation:
Find the pH of a 0.0025 M HCl solution. ... The hydronium ion concentration can be found from the pH by the reverse of the mathematical operation
Scientific notation of 0.00003
0.00003 in scientific notation would be 3 × 10⁻⁵.
The scientific notation of a number is represented as a coefficient multiplied by 10 raised to an appropriate exponent. 0.00003 can be expressed in scientific notation as [tex]3\times 10 ^{-5}[/tex].
Scientific notation is a simple and standardised approach to express extremely big or extremely small numbers. Its foundation is the idea that a number can be expressed as a coefficient times a power of 10. The exponent indicates how many places the decimal point must be moved to get the original value, while the coefficient is normally an integer between 1 and 10 (inclusive of 1 but exclusive of 10). To write 0.00003 in scientific notation, we need to move the decimal point five places to the right to make the coefficient between 1 and 10. 0.00003 can be expressed in scientific notation as [tex]3\times 10 ^{-5}[/tex].
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8.2 moles of ethanol is boiled, how much energy was required to do so?
AH fus=4.60 kJ/mol
AHvap=43.5 kJ/mol
Answer:
Explanation:
Understand that a substance's specific heat (C) is a property that can be used to ... Calculate the heat required to melt 25.7 g of solid methanol at its melting point. ... How many moles of NH4NO3 must be dissolved in water so that 88.0 kJ of heat ... to vaporize 54.0 g of ethanol (C2H5OH) if AHvap for ethanol = 43.5. kJ/mol?
Is the following chemical equation balanced? 1 C2H6+ 102 - 3 H2O + 2
CO2 *
Answer:
No
Explanation:
Answer: smallest whole numbers are 2, 7, 4 and 6
Explanation: C2H6 + 3.5 O2. ⇒ 2. CO2 + 3 H2O
Is hydrogen a metal or a nonmetal? How many valence electrons does a hydrogen atom have?
Answer:
hydrogen is a non-metal and it has 1 valence electron
Explanation:
You can find the valence electrons on the bottom left of your periodic table, it is under the atomic number. Hydrogen is a non-metal because hydrogen conducts heat and electricity poorly.
Number 12 (c) and (d) please help
Answer:
check below
Explanation:
c) Concentrated sulphuric acid is used a drying agent.
d) (use any one of them) Concentrated phosphoric acid, hot aluminium oxide, calcium chloride , anhydrous calcium sulphate
Answer:
12c) it is used as a drying agent
d) anhydrous calcium chloride
calcium oxide can also be used as a drying agent
Name the following acid: H2SO4
Answer:
Mineral Acid
Explanation:
Answer:
sulfuric Acid
Explanation:
Sulfuric acid, sulfuric also spelled sulphuric (H2SO4), also called oil of vitriol, or hydrogen sulfate, dense, colourless, oily, corrosive liquid; one of the most commercially important of all chemicals.
Calculate the energy in joules of a wave particles with a wave length of 6.5×10^6 nm (infrared region)
Answer:
The energy of the wave particle is 3.058 x 10⁻²³ J.
Explanation:
Given;
wavelength of the wave particle, λ = 6.5 x 10⁶ nm = (6.5 x 10⁶) x 10⁻⁹ m
The energy of the wave particle is calculated as;
[tex]E = hf\\\\E = \frac{hc}{\lambda}[/tex]
where;
h is Planck's constant = 6.626 x 10⁻³⁴ J/Hz
c is speed of light = 3 x 10⁸ m/s
[tex]E = \frac{(6.626 \times 10^{-34})(3\times 10^8)}{6.5 \times 10^6 \times 10^{-9}} \\\\E = 3.058 \times 10^{-23} \ J[/tex]
Therefore, the energy of the wave particle is 3.058 x 10⁻²³ J.
I know the answer out here are points for you! It’s 3 if anyone needs the answer !
Answer:
lol thanks for the 10
Explanation:
One mole of each of these compounds is dissolved in water. Which will result in the solution with the greatest conductivity?
1. NaCl
2. Mg(CIO3)2
3. NiCiz
4. CaCl2
Answer:
1. NaCl .
Explanation:
Hello there!
In this case, it is necessary to keep in mind that just ionic compounds are able to conduct electricity and therefore, the more ionic the compound is, the more electricity it conducts. In such a way, we may be able to predict how ionic these compounds are, considering that the electronegativity increases from bottom to top and from left to right.
1. NaCl: this is the most ionic compound since it is at the leftmost group and bonded with chlorine, so this is the most conductive one.
2. Mg(CIO3)2: Mg is bonded to O, not to Cl, which makes the compound ionic but not as ionic as NaCl.
3. NiCl: Ni is more electronegative than Na and Mg, so even when this is ionic, it is not as ionic as NaCl.
4. CaCl2: This is similar to NaCl but since Ca is in group 2A, it is more electronegative than Na, which makes CaCl2 conductive but not as much as NaCl.
Best regards!