Answer:
500 m/s
Explanation:
Wave Speed=Frequency x Wavelength
=50x10
=500
Mass to molecules? 12.5 g N2 to mole?
Answer:
0.44621502566628746
Explanation:
2 Upper P Upper O Upper C l Subscript 3 Baseline (g) + heat double-headed arrow 2 Upper P Upper C l Subscript 3 Baseline (g) + Upper O Subscript 2 Baseline (g) For the equilibrium system described by this equation, what happens if the temperature is decreased?
Answer:
The equilibrium will shift left.
Explanation:
Hope this helps <3
Answer:
1. left 2.right
Explanation:
edge!
Calculate the ratio of H ions to OH– ions at a pH = 7. Find the concentration of H ions to OH– ions listed in Table B of your Student Guide. Then divide the H concentration by the OH– concentration. Record this calculated ratio in Table A of your Student Guide. Compare your approximated and calculated ratios of H ions to OH– ions at a pH = 7. Are they the same? Why or why not? Record your comparison in Table A. What is the concentration of H ions at a pH = 7? mol/L What is the concentration of OH– ions at a pH = 7? mol/L What is the ratio of H ions to OH– ions at a pH = 7? :1.
The pH can be defined as the measure of the acidity or the basicity of the solution. The ratio of hydrogen ion concentration and hydroxide ion concentration at pH 7 is 1.
What is hydrogen ion concentration?The hydrogen ion concentration can be given as the amount of hydrogen percent in the sample solution.
The pH has been the negative logarithmic value measurement of the hydrogen ion in the sample. The sum of the hydrogen ion and the hydroxide ion in the sample has been a constant 14.
[tex]\rm pH+pOH=14[/tex]
The pH can be given as:
[tex]\rm pH=-log[H^+][/tex]
At pH 7 neutral pH the concentration of Hydrogen ion and hydroxide are equal i.e.
[tex]\rm 7=-log[H^+]\\H^+=10^{-7}\;M[/tex]
The hydroxide ion concentration has been given as:
[tex]\rm pOH=-log[OH^-]\\7=-log[OH^-]\\OH^-=10^{-7}\;M[/tex]
The concentration of hydrogen and hydroxide are equal at pH 7. Thus, the ratio of the concentration has been 1.
This states the sample to be neutral.
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A compound is known to have a molar mass of 391.5 g/mol. Find the molecular formula of the compound, given the results of an analysis of a 310.8-g sample that revealed that the sample contains only boron and iodine. The mass of the iodine in the sample is found to be 302.2 g
Going by the result of the analysis as stated in the illustration, the molecular formula of the compound will be [tex]BI_3[/tex]
Molecular formulaMolecular formula = n[empirical formula]
Where n = molar mass/empirical mass
Empirical formula
B = 8.6/10.8
= 0.8
I = 302.2/126.9
= 2.38
Dividing by the smallest:
B = 0.8/0.8 = 1
I = 2.38/0.8 = 3
Empirical formula = [tex]BI_3[/tex]
Empirical formula mass = 10.811 + 126.9x3
= 391.5
n = 391.5/391.5 = 1
Thus, the molecular formula of the compound = empirical formula = [tex]BI_3[/tex]
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True or false, some molecules have the same molecular formula as their empirical formula.
Answer:
True, some molecules have the same molecular formula as their empirical formula.
Explanation:
The empirical formula of many compounds may be the same. Formaldehyde, for example, has the chemical formula CH2O, which is equal to the empirical formula of glucose. Each molecule of formaldehyde has one carbon atom, two hydrogen atoms, and one oxygen atom.
Barium fluoride (BaF2) has a Ksp = 2. 5 × 10–5 (mol/L)3.
i. Write the dissolution reaction of BaF2, including all states. (0. 5 points)
ii. Write the expression for Ksp for BaF2. (0. 5 points)
iii. Write the Ksp expression as an algebraic equation, using the variable x to represent concentrations. (1 point)
iv. Find the solubility of BaF2 by solving the equation you wrote in part iii. (0. 5 points)
This problem is asking for the dissolution reaction of barium fluoride, both the equilibrium and Ksp expressions in terms of concentrations and x and its molar solubility in water. Thus, answers shown below:
[tex]BaF_2(s)\rightleftharpoons Ba^{2+}(aq)+2F^-(aq)[/tex][tex]Ksp=[Ba^{2+}][F^-]^2[/tex][tex]Ksp=(x)(2x)^2[/tex]0.0184 M.Solubility productIn chemistry, when a solid is dissolved in water, one must take into account the fact that not necessarily its 100 % will be able to break into ions and thus undergo dissolution.
In such a way, and specially for sparingly soluble solids, one ought to write the dissolution reaction at equilibrium as shown below for the given barium fluoride:
[tex]BaF_2(s)\rightleftharpoons Ba^{2+}(aq)+2F^-(aq)[/tex]
Next, we can write its equilibrium expression according to the law of mass action, which also demands us to omit any solid and refer it to the solubility product constant (Ksp):
[tex]Ksp=[Ba^{2+}][F^-]^2[/tex]
Afterwards, one can insert the reaction extent, x, as it stands for the molar solubility of this solid in water, taking into account the coefficients balancing the reaction:
[tex]Ksp=(x)(2x)^2[/tex]
Finally, we solve for the x as the molar solubility of barium fluoride as shown below:
[tex]2.5x10^{-5}=(x)(2x)^2\\\\2.5x10^{-5}=4x^3\\\\x=\sqrt[3]{\frac{2.5x10^{-5}}{4} } \\\\x=0.0184M[/tex]
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Which two substances combine in a car's engine to provide energy?
Answer:
Fuel and oxygen
Explanation: Carbon in the fuel and the oxygen from the air burns.
Which compound can inadvertently be created through the distillation process and can be fatal if consumed
Answer:
lWhich compound can inadvertently be created through the distillation process and can be fatal if consumed?
Methanol
I got more(science)please help I’m to lazy-
Answer:
D :DDDDDDDDDDD
what is the term called when it means to lacks properties of metal?
Answer:
The used term is nonmetal.
Explanation:
Nonmetals are elements that are not shiny or are not good conductors of electricity or heat.
The periodic table has approximately 23 nonmetals in it.
In the periodic table, we can find elements. These ones could be nonmetal and metals.
The elements that lack metallic properties are the nonmetals.
Metals are good conductors of heat and electricity, like Cu or Fe.
Although, nonmetals are not good conductors.
Hello I'm always here to help!!!
___________________________
A nonmetal is an element that lacks the majority of metal's characteristics. Nonmetals make up all of the elements in the shaded boxes. On Earth, many of the nonmetals are common elements. Nonmetals have physical traits that are diametrically opposed to metals. Solid nonmetals are dull, which means they aren't gleaming.
___________________________
Have a great day!!!!
* I NEED THIS *
Which of the following statements about oceans is incorrect?
A: Oceans collect water from other reservoirs including streams and rivers.
B: Oceans are the main source of drinking water on Earth's surface.
C: Oceans are connected to other reservoirs through evaporation and precipitation.
D: Oceans are the main type of reservoir that contain salt water.
Answer:
B is incorrect
Explanation:
Ocean are made of salt water which is undrinkable therefore they are not any type of drinking water source.
A solid has a very high melting point, great hardness, and poor electrical conduction. This is a(n) ________ solid
A gas initially at 273k is heated such that it volume and pressure became twice their original volume what is the new temperature of the gas
Answer:
1092K
Explanation:
We can use the combined gas law to answer this question:
P1V1/T1 = P2V2/T2,
where P, V and T are the Pressure, Volume, and Temperature for initial (1) and Final (2) conditions. Temperatures must be in Kelvin.
The problem states that V2 = 2V1 and P2 = 2P1.
Let's rearrange to solve for T2, which is the question:
T2 = T1(P2/P1)(V2/V1)
Note how the pressure and temperature values are written: as ratios. Enter the values:
T2 = (273K)(P2/P1)(V2/V1)
T2 = (273K)(2P1/P1)(2V1/V1) [Use the expressions for V2 and P2 from above]
T2 = (273K)(2)(2)
T2 = 1092K
What is the pH of a KOH solution that has [H ] = 1. 87 × 10–13 M? What is the pOH of a KOH solution that has [OH− ] = 5. 81 × 10−3 M? What is the pH of a solution of NaCl that has [H ] = 1. 00 × 10–7 M?.
pH is the hydrogen ion concentration and pOH is the hydroxide ion concentration in the solution. pH KOH is 12.73, pOH KOH is 2.24 and pH NaCl is 7.
What are pH and pOH?pH is the negative log of the hydrogen ion concentration and pOH is the negative log of the hydroxide ion concentration.
The relation between the pH and pOH can be given as, [tex]\rm pOH = 14 - pH[/tex]
The pH of KOH can be calculated by the formula,
[tex]\rm pH = \rm -log [H^{+}][/tex]
In the first case, the concentration of the KOH is [tex]1. 87 \times 10^{-13}\;\rm M[/tex]
Substituting values in the equation:
[tex]\begin{aligned} \rm pH &= \rm -log [H^{+}]\\\\&= \rm -log [1. 87 \times 10^{-13}\;\rm M ]\\\\&= 12.73\end{aligned}[/tex]
Hence, the pH of KOH is 12.73.
pOH of KOH can be calculated by the formula,
[tex]\rm pOH = \rm -log [OH^{-}][/tex]
The hydroxide concentration of the KOH solution is [tex]5. 81 \times 10^{-3}\;\rm M[/tex]
Substituting value in the equation:
[tex]\begin{aligned} \rm pOH &= \rm -log [OH^{-}]\\\\&= \rm -log [5. 81 \times 10^{-3}\;\rm M ]\\\\&= 2.24 \end{aligned}[/tex]
Hence, the pOH of KOH is 2.24
The pH of NaCl can be calculated by the formula,
[tex]\rm pH = \rm -log [H^{+}][/tex]
In the third case, the concentration of the NaCl is [tex]1. 00\times 10^{-7}\;\rm M[/tex]
Substituting values in the equation:
[tex]\begin{aligned} \rm pH &= \rm -log [H^{+}]\\\\&= \rm -log [1. 00 \times 10^{-7}\;\rm M ]\\\\&= 7 \end{aligned}[/tex]
Hence, the pH of KOH is 7.0.
Therefore, KOH is basic and NaCl is approximately neutral.
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three ways in which atmosphere nitrogen can be fixed
There are three major ways in which this happens: first, by lightning, when the energy of lightning strikes breaks apart the N2 bonds; second, by industrial methods, when humans break the bonds with high pressure and temperatures, and hydrogen; finally, by biological fixation, with bacteria living in the soil.
gas occupies 100.0 mL at a pressure of 780 mm Hg. What is the volume of the gas
when its pressure is increased to 880 mm Hg?
Answer:
Final volume after applying 880 mmHg pressure = 89.28
Explanation:
Initial volume (V 1)= 100 ml
Initial pressure (P1) =780 mm Hg = 780/780 = 1atm
Final pressure (P2)=880 mm Hg = 880/780 =1.12 atm
Final volume (V2)=?
We know that,
Applying Boyle's law,
P1 V1=P2 V2
1*100=1.12*V2
100=1.12*V2
100/1.12=V2
89.28=V2
V2=89.28 ml
Hope this helps you. Please mark me as a brainlist.
Give the characteristic of a first order reaction having only one reactant.
Answer:
As the first order reaction depends on (a uni-molecular reaction) the concentration of only one reactant.
And the rate law of the reaction of first order with a reactant A is:
rate = K[A]^-1
when K is the rate constant.
help this mirrorball, please
Answer:
Option B
Explanation:
Avagadro's hypothesis showed that at constant temperature and pressure equal volume of all gases contains equal no of molecules.
Avagadro's constant is known as 6.022×10^23
Which of the following represents Avogadro's hypothesis?
Equal volumes of all gases under same conditions of temperature and pressure contain equal number of moleculesAvogadro's hypothesis is an experimental gas law that relates to the volume of gas to the amount of gas present. Its formula is :
[tex] \sf \frac{V_1}{ n_{1} } = \frac{V_2}{ n_{2} } [/tex]
Where,
V1 is first volumeV2 is second volumen1 is first amount of gas (in moles)n2 is second amount of gas (in moles)According to the periodic table how many elements are metal
Use the periodic table to determine the molar mass of silver oxide (Ag20).
Type the correct answer in the box. Use numerals, and express your answer to the correct number of significant figures
(blank) g/mol
The molar mass of the compound (i.e silver oxide) Ag₂O obtained from the periodic table is 232 g/mol
What is the molar mass of a compound?The molar mass a compound is simply defined as the sum of the molar masses of the individual elements found in the compound.
How to determine the molar mass of the compound Formula = Ag₂OMolar mass of Ag = 108 g/mol Molar mass of O = 16 g/mol Molar mass of Ag₂O =?Molar mass of Ag₂O = (2×108) + 16
Molar mass of Ag₂O = 216 + 16
Molar mass of Ag₂O = 232 g/mol
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Answer: 231.753 g/mol
Explanation:
got it right on Exact Path
14. When weathering breaks down rocks with water, wears things away with wind, and scorches or freezes the earth
with temperature, it is called
weathering
15. In chemical weathering chemicals in the air mix with water to make
that eats
away at limestone rock Oxygen reacts with iron and forms
16. Erosion is the flow of water that moves rocks and sand, the push of the wind that carries sediments away and
even the movement of a
dropping pieces of rock at the bottoms of oceans and lakes.
Go onto brainpop.com and find the tutorial called Weathering. Login with sawgrassmid and poplearn.
and eventually
17. Weathering is the process that breaks down rocks into
18.
formation depends on sediments from weathering and those same bits make up sedimentary
rocks.
Answer:
14. Mechanical Weathering
15. & 16. I'm not sure
17. Smaller Pieces, Minerals I think
18. I can't remember
Explanation:
I'm not 100% sure about these but I hope they help. Sorry I couldn't do any more.
Which symptoms are common with cardiac dysrhythmias? Select all that apply.
low blood pressure
fluid buildup in the hands
dizziness
palpitations
headaches
Answer: low blood, dizziness, and palpitations
Explanation: Im doing the assignment now
is the tendency of an object to resist a change in its state of motion.
Answer:
Inertia is the tendency of an object to resist changes in its state of motion.
Explanation:
hope this helps
What is the pH of a solution of RbOH with a concentration of 0.86 M? Answer to 2 decimal places
Answer:The pH of the solution is given by pH=−log([H3O+])
Explanation:so you can't use
pH
=
−
log
(
0.150
)
because that's the concentration of the hydroxide anions,
OH
−
, not of the hydronium cations,
H
3
O
+
. In essence, you calculated the
pOH
of the solution, not its
pH
.
Sodium hydroxide is a strong base, which means that it dissociates completely in aqueous solution to produce hydroxide anions in a
1
:
1
mole ratio.
NaOH
(
a
q
)
→
Na
+
(
a
q
)
+
OH
−
(
a
q
)
So your solution has
[
OH
−
]
=
[
NaOH
]
=
0.150 M
Now, the
pOH
of the solution can be calculated by using
pOH
=
−
log
(
[
OH
−
]
)
−−−−−−−−−−−−−−−−−−−−
In your case, you have
pOH
=
−
log
(
0.150
)
=
0.824
Now, an aqueous solution at
25
∘
C
has
pH + pOH
=
14
−−−−−−−−−−−−−−so you can't use
pH
=
−
log
(
0.150
)
because that's the concentration of the hydroxide anions,
OH
−
, not of the hydronium cations,
H
3
O
+
. In essence, you calculated the
pOH
of the solution, not its
pH
.
Sodium hydroxide is a strong base, which means that it dissociates completely in aqueous solution to produce hydroxide anions in a
1
:
1
mole ratio.
NaOH
(
a
q
)
→
Na
+
(
a
q
)
+
OH
−
(
a
q
)
So your solution has
[
OH
−
]
=
[
NaOH
]
=
0.150 M
Now, the
pOH
of the solution can be calculated by using
pOH
=
−
log
(
[
OH
−
]
)
−−−−−−−−−−−−−−−−−−−−
In your case, you have
pOH
=
−
log
(
0.150
)
=
0.824
Now, an aqueous solution at
25
∘
C
has
pH + pOH
=
14
−−−−−−−−−−−−−−
Identify the different stages of the water cycle and the changes in the phases of water. Illustrate the arrangement and motion of particles in each phase change. Use the water cycle diagram below as reference.
The water cycle is largely composed of evaporation, condensation and precipitation.
What is the water cycle?The water cycle has to do with the movement of water throughout the ecosystem. It is one of the biogeochemical cycles that exists in nature. In the water cycle, water evaporates from the earth surface, condenses and falls as rain.
Hence, the major components of the water cycle are;
EvaporationCondensationPrecipitationLearn more about water cycle: https://brainly.com/question/1151425
PREDICT THE PRODUCTS AND AND BALANCE THE EQUATION
Al(s) + __O2 (g)
Answer:
See below.
Explanation:
Products :-
Al₂O₃ (aluminum oxide)
Balanced Equation :-
4Al + 3O₂ => 2Al₂O₃
Hope it helps.
What is the solid that forms when a solution starts to freeze.
how many CO2 molecules exist in the following reaction? C3H8 + 5O2 >>> 3CO2 + 4H2O
Answer:
21.0g of CO2
Explanation:
What is the group number and period number for Selenium?
group 7A, period 4
group 6A, period 4
group 6a. period 3
group 4a, period 6
Answer:
Group 6a, period 4
Explanation:
Refer to image
What do you notice about the Total
height lost in each set of trials?
Answer: In each set of trails, the total height lost was the same.
Explanation:
