Answer:
The table feels cold because it is at a lower temperature than the students' hands, and thermal energy is being pulled into the table.
Explanation:
The thermal conductivity of the table is low and so it feels cold.
What is Thermal Conductivity?Thermal conductivity is the measure of the ability of a material to conduct heat.
The rate at which heat is transported by conduction through a material's unit cross-section area when a temperature gradient exits perpendicular to the area is known as thermal conductivity.
Thermal energy is the energy contained within a system that accounts for the temperature of the system.
The human body cannot measure the temperature of any object but it can feel the difference in the temperature.
If one body is at 20 degrees Celsius, and an object is at 30 degrees Celsius, then the body will feel hot when the object is touched.
Similarly, when the students touched the table, the conductivity of the wood is very low, and it feels cold.
The thermal energy of the table is lower than the thermal energy of the body.
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Physical and chemical changes occur all around you every day. Read the story below and use the movable
highlighter pieces to highlight the physical changes in PURPLE and the chemical changes in ORANGE.
The physical changes are:
"blend up a banana smoothie instead"."cut a piece of bread in half"."I cracked two eggs and whipped them with a fork"."water had evaporated"."glass breaking"."Steam was rolling out"."broke off a piece"."the chocolate melted".The chemical changes are:
"the milk had soured"."was covered in brown spots"."it was completely tarnished"."plants were dying"."toast must be burning"."rusted bicycle".Changes of matterMatter can undergo 2 kinds of changes:
Physical changes: matter changes form but not its identity.Chemical changes: matter changes its identity due to a chemical reaction.Let's consider the following text.
When my alarm went off at 70'clock, I hit snooze" a few times then finally got out of bed with excitement for my morning bowl of cereal. I poured the cereal and milk into my bowl. But before I even drank it, I could tell from the smell that the milk had soured! So, I decided to blend up a banana smoothie instead. I took some ice out of the freezer and grabbed the only banana that we had in the kitchen, which was covered in brown spots. My grumbling stomach needed to be satisfied before school so I didn't really care.
Just as I was sitting down to drink my smoothie my little brother came bounding into the kitchen and asked, Would you make some eggs and toast for me for breakfast?
"Ugh, sure," I said. I cut a piece of bread in half and put it in the toaster, then I cracked two eggs and whipped them with a fork. I reached for one of my mother's copper cooking pans in the cabinet and saw that it was completely tarnished! I didn't want to be blamed for this, so I ran to tell my mother right away. As I ran out of the kitchen slipped on that banana peel and it smeared all over the floor. As I lay on the floor with the wind knocked from me, I noticed that our family's plants were dying and that some water had evaporated from our fish tank. I made a mental note to take care of these things after school.
Just as I regained my breath and stood up, I heard glass breaking upstairs and my mother shrieking. I ran up the stairs, breathing heavily now. Steam was rolling out from the open bathroom door. When the steam cleared, saw why my mother had been screaming. Before me was my older sister standing in the bathroom with purple hair. I inferred from the scene that my mother had dropped a glass when she first saw her look what your sister did to her hair my mother yelled furiously I decided that I needed to get out of the house immediately, this morning was a crazy one!
A distinct smell was waiting up the stairway and I realized that my brother's toast must be burning! When reached the kitchen, my brother was happily spreading butter on his very browned toast. "I like my toast really crispy!" he said.
"Good I can't handle any more chaos this morning! I exclaimed. I grabbed my backpack headed out into the foggy morning air, and hopped on my slightly rusted bicycle to ride to school. A few minutes into my ride, my stomach grumbled and I realized that I never got a chance to drink my banana smoothie. Luckily, I had stashed a chocolate bar in my backpack yesterday. "Yes! I thought as I stopped pedaling, grabbed the chocolate and broke off a piece. As the chocolate melted in my mouth, I knew that my day was bound to get better!
The physical changes are:
"blend up a banana smoothie instead"."cut a piece of bread in half"."I cracked two eggs and whipped them with a fork"."water had evaporated"."glass breaking"."Steam was rolling out"."broke off a piece"."the chocolate melted".The chemical changes are:
"the milk had soured"."was covered in brown spots"."it was completely tarnished"."plants were dying"."toast must be burning"."rusted bicycle".Learn more about physical and chemical changes here: https://brainly.com/question/17384175
How many moles of HNO3 are present in 697 grams of HNO3?
Answer:
Explanation:
given mass = 697 g
molar mass = mass of H × mass of N × 3 × mass of O
= 1 × 14 × 3 × 16 = 672 g
no. of moles = given mass / molar mass = 697 / 672 = 1.03 moles
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I find the pH of a solution whose hydrogen ion concentration 10^-3mol/l also deduce the pOH of the solution
II
Answer:
pOH = 11
pH = 3
Explanation:
Given data:
Hydrogen ion concentration = 10⁻³ mol/L
pOH of solution = ?
pH of solution = ?
Solution:
pH = -log[H⁺]
Now we will put the values.
pH = -log[ 10⁻³]
pH = -(-3) log 10
pH = 3
pOH of solution:
pOH + pH = 14
pOH = 14 - pH
pOH = 14 - 3
pOH = 11
an area of high pressure occurs when
Answer:
A high-pressure area, high, or anticyclone, is a region where the atmospheric pressure at the surface of the planet is greater than its surrounding environment. Winds within high-pressure areas flow outward from the higher pressure areas near their centers towards the lower pressure areas further from their centers.
Explanation:
Calculate the expected pH of the buffer after the addition of 1.0 mL of 1M HCl. Remember that you are using 50 mL of the buffer, so be sure to calculate the moles of acetic acid and acetate in 50 mL of the buffer.
Answer:
Explanation:
From the given information;
the molecular molarity of the acid and base are as follows:
For acid : 5 mL × 0.20 M = 0.1 mmol
For base: 5 mL × 0.20 M = 0.1 mmol
However;
0.05 m × 1.0 M = 0.05 mmol of acid HCl
Similarly, When the acid undergoes reaction with the base; the amount of acid and base left are as follows:
Amount of acid left:
0.1 + 0.05 = 0.15 mmol
Amount of base left:
0.1 - 0.05 = 0.05 mmol
The formula for calculating the Buffer pH is:
[tex]pH = pka + log(\dfrac{Base}{Acid} )[/tex]
Recall that for Acetic, the acid dissociation constant = 4.74
Then:
[tex]pH =4.74+ log(\dfrac{0.05}{0.15} )[/tex]
[tex]pH =4.74+ log(0.333)[/tex]
pH = 4.74 - 0.4775
pH = 4.26
Therefore, the decrease in pH is about 0.48 units
The energy required to ionize boron is 801 kJ/mol. You may want to reference (Pages 93 - 98) Section 2.5 while completing this problem. Part A What minimum frequency of light is required to ionize boron
Answer:
The frequency is [tex]f = 2,01 * 10^{15} \ Hz [/tex]
Explanation:
From the question we are told that
The energy required to ionize boron is [tex]E_b = 801 KJ/mol[/tex]
Generally the ionization energy of boron pre atom is mathematically represented as
[tex]E_a = \frac{E_b}{N_A}[/tex]
Here [tex]N_A[/tex] is the Avogadro's constant with value [tex]N_A = 6.022*10^{23}[/tex]
So
[tex]E_a = \frac{801}{6.022*10^{23}}[/tex]
=> [tex]E_a = 1.330 *10^{-18} \ J/atom [/tex]
Generally the energy required to liberate one electron from an atom is equivalent to the ionization energy per atom and this mathematically represented as
[tex]E = hf = E_a[/tex]
=> [tex] hf = E_a[/tex]
Here h is the Planks constant with value [tex]h = 6.626 *10^{-34}[/tex]
So
[tex]f = \frac{1.330 *10^{-18}}{ 6.626 *10^{-34}}[/tex]
=> [tex]f = 2,01 * 10^{15} \ Hz [/tex]
What mass of water is produced from the complete combustion of 6.60×10−3 g of methane?
which objects would have a greater gravitational force between them, Objects A and B, or Objects B and C? HELPPP
What is the mass in grams of 8 moles of Cu?
Answer:
mass = 508 g
Explanation:
Given data:
Number of moles of Cu = 8 mol
Mass in gram = ?
Solution:
Number of moles = mass/molar mass
Molar mass of Cu is 63.5 g/mol.
Now we will put the values in formula.
8 mol = mass /63.5 g/mol
mass = 63.5 g/mol ×8 mol
mass = 508 g
How many atoms are in 64 g sulfur (S)?
O A. 6.02 x 1023 atoms
OB. 646.02 x 1023) atoms
O C. 32(6.02 x 1023) atoms
D. 2(6.02 x 1023) atoms
Answer:
D) 2( 6.02 ×10^23)
Explanation:
using n=m
M
where n = moles
m=mass of substance
M=molar mass .
n( sulfur ) =64
32
= 2
using N =nL
where N is number of entities
n = moles
L= 6.02×20^23
N( of atoms of sulfur) =2(6.02×10^23)
32(6.02 x 10²³) number of atoms are in 64 g sulfur (S) is:
C. 32(6.02 x 10²³) atoms
To determine the number of atoms in 64 grams of sulfur (S), you need to use Avogadro's number, which is approximately 6.02 x 10²³ atoms/mol. This number represents the number of atoms or molecules in one mole of a substance.
1. Find the molar mass of sulfur (S):
The molar mass of sulfur (S) is the mass of one mole of sulfur atoms, and you can find it on the periodic table. The molar mass of sulfur is approximately 32.06 g/mol.
2. Calculate the number of moles of sulfur:
To calculate the number of moles, divide the given mass (64 g) by the molar mass of sulfur (32.06 g/mol):
Number of moles = Mass of sulfur / Molar mass of sulfur
Number of moles = 64 g / 32.06 g/mol
Number of moles = 1.997 moles
3. Use Avogadro's number to find the number of atoms:
Now, multiply the number of moles by Avogadro's number:
Number of atoms = Number of moles × Avogadro's number
Number of atoms = 1.997 moles × 6.02 x 10²³ atoms/mol
Number of atoms = 1.202 x 10²⁴ atoms
So, there are approximately 1.202 x 10²⁴ atoms in 64 grams of sulfur (S). The closest option to this value is:
C. 32(6.02 x 10²³) atoms (which is equivalent to 1.924 x 10²⁴ atoms)
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A sample of N2O effuses from a container in 47s .
Required:
How long would it take the same amount of gaseous I2 to effuse from the same container under identical conditions?
Answer:
112.92 s.
Explanation:
Let M₁ be the molar mass of N₂O
Let t₁ be the time taken for N₂O to effuse.
Let M₂ be the molar mass of I₂
Let t₂ be the time taken for I₂ to effuse.
Molar mass (M₁) of N₂O = (14×2) + 16 = 28 + 16 = 44 g/mol
Time (t₁) of effusion of N₂O = 47 s
Molar mass (M₂) of I₂ = 127 × 2 = 254 g/mol
Time (t₂ ) of effusion of I₂ =?
The time take for the same amount of I₂ to effuse can be obtained as follow:
t₂/t₁ = √(M₂/M₁)
t₂/47 = √(254 / 44)
Cross multiply
t₂ = 47 × √(254 / 44)
t₂ = 112.92 s
Therefore, it will take 112.92 s for the same amount of I₂ to effuse.
How are resonance structures for a molecule or polyatomic ion represented?
As a progression of structures.
The parts of each structure that vary are circled.
The parts of each structure that vary are highlighted.
With a double-headed arrow in between each structure.
The answer is number 4
What does the term mass mean in science?
A. The measure of the force of gravity on an object.
B. The amount of matter in an object.
C. The Amount of space that matter takes up.
Answer:
B
Explanation:
Mass is defined as the quantity of matter in an object.
PLEASE HELP!! 74 POINTS
An igneous rock has small, dark crystals. Which statement also accurately describes this rock?
It is an intrusive rock.
It has a coarse texture.
It was found on Earth’s surface.
It was formed from slow cooling.
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Which is one factor that contributes to the formation of polar, temperate, and tropical zones?
the angle of the Sun’s rays
the direction of seasonal winds
the presence of prevailing winds
the movement of wind near a mountain
Answer:
It was formed from slow cooling.
the angle of the Sun’s rays
Explanation:
Answer:
D. It was formed from slow cooling.
If Sodium has a 1+ charge, and Phosphous has a 3- charge, how many Sodium are needed for every Phosphous?
Answer:
Explanation:
It will take 3 sodium ions to neutralize 1 phosphorus ion. That's because you need 3 plus's to satisfy the - charge on phosphorous. So the chemical formula is Na3P reflecting this fact.
Tungsten (W) and chlorine (Cl) form a series of compounds with the following compositions:_______.
Mass % W Mass % Cl
72.17 27.83
56.45 43.55
50.91 49.09
46.36 53.64
If a molecule of each compound contains only one tungsten atom, what are the formulas for the four compounds?
Answer:
WCl₂, WCl₄, WCl₅, WCl₆
Explanation:
Molar Mass of Tungsten = 184 g/mol
Mass of Chlorine = 35.5 g/mol
In the first compound;
Percentage of tungsten = 72.17 %
Upon solving;
72.17 % = 184
100 % = Total mass
Total mass of compound = 254.95g
Mass of chlorine = 254.95 - 184 = 70.95 (Dividing by 35.35; This is approximately 2 Chlorine atoms.
The Formular is WCl₂
In the second compound;
Percentage of tungsten = 56.45 %
Upon solving;
56.45 % = 184
100 % = Total mass
Total mass of compound = 325.95 g
Mass of chlorine = 325.95 - 184 = 141.95g (Dividing by 35.35; This is approximately 4 Chlorine atoms.
The Formular is WCl₄
In the third compound;
Percentage of tungsten = 50.91 %
Upon solving;
50.91 % = 184
100 % = Total mass
Total mass of compound = 361.42 g
Mass of chlorine = 361.42 - 184 = 177.42 (Dividing by 35.35; This is approximately 5 Chlorine atoms.
The Formular is WCl₅
In the fourth compound;
Percentage of tungsten = 46.39 %
Upon solving;
46.39 % = 184
100 % = Total mass
Total mass of compound = 396.64 g
Mass of chlorine = 396.64 - 184 = 212.64 (Dividing by 35.35; This is approximately 6 Chlorine atoms.
The Formular is WCl₆
A student measured the masses of four different-sized blocks. The student determined that each block had a mass of 50 grams.
(There is a small block, a little bit bigger block, a big block and the biggles block)
Which block has the least density?
Answer:..
Explanation:
Give an example of a substance that is MORE dense in its solid state when compared to its liquid state.
Answer: Wax
Explanation:
Density is defined as the mass contained per unit volume.
[tex]Density=\frac{mass}{Volume}[/tex]
Usually solids are more denser than liquid, as molecules in solid are more strongly packed and thus have more mass per unit volume.
Liquids on the other hand contain molecules which are less tightly bound and thus thus contain less mass per unit volume as compared to solid.
Example: Solid wax is more denser than liquid wax.
The heat of vaporization for benzaldehyde is 48.8 kJ/mol, and its normal boiling point is 451.0 K. Use this information to determine benzaldehyde’s vapor pressure (in torr) at 53.5°C. Report your answer to three significant digits.
Answer:
[tex]p_2=5.17torr[/tex]
Explanation:
Hello.
In this case, by using the Clausius-Clapeyron Equation which allows us to relate the vapor pressure, temperature and heat of vaporization as shown below:
[tex]ln(\frac{p_1}{p_2} )=\frac{\Delta _vH}{R}(\frac{1}{T_2}-\frac{1}{T_1} )[/tex]
Whereas [tex]p_1[/tex] is 760 torr due to the normal conditions. In such a way, for computing the vapor pressure of benzaldehyde at 53.5 °C (326.65 K), we proceed as shown below:
[tex]\frac{p_1}{p_2} =exp[\frac{48800J/mol}{8.314\frac{J}{mol*K}}(\frac{1}{326.65K}-\frac{1}{451.0K} )]\\\\\frac{p_1}{p_2}=147.0[/tex]
Thus, the vapor pressure at the final T is:
[tex]p_2=\frac{p_1}{147.0}=\frac{760torr}{147.0}\\ \\p_2=5.17torr[/tex]
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Which element has a full valance shell of eight electrons?
Fluorine
Oxygen
Neon
Sodium
Answer:
Neon
Explanation:
All noble gases have 8 valence electrons except helium.
Noble gases include Helium, neon, argon, krypton, xenon, redon.
Electronic configuration of neon:
Ne₁₀ = [He] 2s² 2p⁶
All other options are incorrect because,
Electronic configuration of Fluorine:
F₉ = [He] 2s² 2p⁵
Fluorine have seven valence electrons.
Electronic configuration of oxygen:
O₈ = [He] 2s² 2p⁴
Oxygen have six valence electrons.
Electronic configuration of sodium:
Na₁₁ = [Ne] 3s¹
sodium have one valence electron.
Which temperature is warmer 0° F or 0°C
Answer:
0 degree C
Explanation:
0 degree C = 32 degree F
0 degree F = -17.7778 degree C
Answer:
0 degrees C would be warmer
Explanation:
Which element will gain three electrons to form an anion?
A. aluminum
B. chromium
C. iron
D. nitrogen
Answer:
D represents the element nitrogen which will gain three valence electrons forming a 3 ion.
Answer:
answer is
Explanation:
D
When the following redox equation is balanced with smallest whole number coefficients, the coefficient for the iodide ion will be _____.
I–(aq) + NO3–(aq) → NO(g) + I2(s) (acidic solution)
Answer:
When the following redox equation is balanced with smallest whole number coefficients, the coefficient for the iodide ion will be __6__.
Explanation:
From the redox equation, we can see that NO₃⁻ is reduced to NO (from oxidation state +5 to +2), whereas I⁻ is oxidized to I₂ (from oxidation state -1 to 0). The half reactions are balanced with H⁺ (acidic solution), as follows:
Reduction : 2 x (NO₃⁻(aq) + 3 e- + 4 H⁺ → NO(g) + 2 H₂O)
Oxidation : 3 x (2 I⁻(aq) → I₂(s) + 2 e-)
----------------------------------------------------------------------
Total equation: 6 I⁻(aq) + 2 NO₃⁻(aq)+ 8 H⁺ → 3 I₂(s) + 2 NO(g) + 4 H₂O
That is the redox equation with the smallest whole number coefficients.
Accordin to this, the coefficient for the iodide ion (I⁻) is: 6.
The given redox equation is balanced with the smallest whole-number coefficients, the coefficient for the iodide ion will be 6.
Redox reactionRedox reaction is the reaction in which oxidation and reduction both occur simultaneously.
From the redox equation, we can see that NO₃⁻ is reduced to NO (from oxidation state +5 to +2), whereas I⁻ is oxidized to I₂ (from oxidation state -1 to 0).
The half reactions are balanced with H⁺ (acidic solution), as follows: Reduction : 2 x (NO₃⁻(aq) + 3 e- + 4 H⁺ → NO(g) + 2 H₂O)
Oxidation : 3 x (2 I⁻(aq) → I₂(s) + 2 e-) ----------------------------------------------------------------------Total equation: 6 I⁻(aq) + 2 NO₃⁻(aq)+ 8 H⁺ → 3 I₂(s) + 2 NO(g) + 4 H₂O
That is the redox equation with the smallest whole number coefficients.
According to this, the coefficient for the iodide ion (I⁻) is: 6.
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What amount (moles) of compound is present in 1.00 g of each of the compounds in Exercise 54?
Answer:
1. Caffeine, C₈H₁₀N₄O₂
Amount = 1.00/194 = 0.00515 moles
2. Ethanol, C₂H₅OH
Amount = 0.0217 moles
3. Dry Ice, CO₂
amount = 0.0227 moles
Note: The question is incomplete. The compound are as follows:
1. Caffeine, C₈H₁₀N₄O₂;
2. Ethanol, C₂H₅OH;
3. Dry Ice, CO₂
Explanation:
Amount (moles) = mass in grams /molar mass in grams per mole
1. Caffeine, C₈H₁₀N₄O₂
molar mass of caffeine = 194 g/mol
Amount = 1.00 g/194 g/mol = 0.00515 moles
2. Ethanol, C₂H₅OH
molar mass of ethanol = 46 g/mol
Amount = 1.00 g/46 g/mol = 0.0217 moles
3. Dry Ice, CO₂
molar mass of dry ice = 44 g/mol
amount = 1.00 g/44 g/mol = 0.0227 moles
characteristic line spectra only appear in the visible region of light. true or false
Answer:
The answer is true
Explanation:
bc I took this on edgeunity
he heat of fusion of tetrahydrofuran is . Calculate the change in entropy when of tetrahydrofuran melts at . Be sure your answer contains a unit symbol. Round your answer to significant digits.
Answer:
[tex]\Delta S=1.8x10^{-3}\frac{kJ}{K}=1.8\frac{J}{K}[/tex]
Explanation:
Hello.
In this case, given the heat of fusion of THF to be 8.5 kJ/mol and freezing at -108.5 °C, for the required mass of 5.9 g, we can compute the entropy as:
[tex]\Delta S=\frac{n*\Delta H}{T}[/tex]
Whereas n accounts for the moles which are computed below:
[tex]n=5.9g*\frac{1mol}{72g} =0.082mol[/tex]
Thus, the entropy turns out:
[tex]\Delta S=\frac{0.0819mol*8.5 kJ/mol}{(-108.5+273.15)K}\\\\\Delta S=1.8x10^{-3}\frac{kJ}{K}=1.8\frac{J}{K}[/tex]
Best regards.
How would you classify a creepy
crawly with no vertebrae and more
than 6 jointed legs?
Rileach
s. snake
T. spider
v.cockroach
Answer:
T
Explanation:
A Spider is a creepy crawly with no vertebrae and more than 6 jointed legs.
The Spider belongs to the class Arachnida . The Spider can be referred to as a non-vertebrates hence , they don't have a vertebrae(backbone).
The Spider and Cockroach are both non-vertebrates but with different pairs of legs. A cockroach is belongs to the class Insecta in which those under this class have only six jointed legs.
The Spider has eight jointed legs which is more than six and is a characteristic of Arachnids.
A snake on the other hand is a vertebrate which exempts it from being the answer.
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Pyridine, C5H5N, is a bad-smelling liquid that is a weak base in water. Its pKb is 8.77. What is the pH of a 0.20 M aqueous solution of this compound
Answer:
pH = 9.26
Explanation:
Let's make the reaction of this weak base:
C₅H₅N + H₂O ⇄ C₅H₅NH⁺ + OH⁻ Kb
We do not know the Kb, but we can discover it from pKb
Kb = 10^⁻pKb → 10⁻⁸'⁷⁷ = 1.70×10⁻⁹
So, let's make the expression for Kb
Kb = [OH⁻] . [C₅H₅NH⁺] / [C₅H₅N]
In the equilibrum, we would have 0.20 moles from the begining - x (react)
So we would proudce x moles of OH⁻ and x moles of C₅H₅NH⁺.
In conclussion:
1.70×10⁻⁹ = x . x / (0.20 - x)
To avoid the quadratic formula we can miss the x from the substraction
1.70×10⁻⁹ = x² / 0.20
1.70×10⁻⁹ . 0.20 = x²
We avoid the x from the (0.20-x), because the base is so concentrated, and Kb is very small.
x = √(1.70×10⁻⁹ . 0.20) → 1.84×10⁻⁵
That's the value of [OH⁻], so we can calculate pOH
- log [OH⁻] = pOH → - log 1.84×10⁻⁵ = 4.73
Then pH = 14 - pOH
14 - 4.73 = 9.26
The pH of a 0.20 M aqueous solution of pyridine is approximately 9.26.
Given,
pKb = 8.77
Concentration = 0.20M
The pKb is related to the pKa by the equation: pKa + pKb = 14.
pKa = 14 - 8.77 = 5.23.
Since pyridine is a base, it can be treated as the conjugate base of its corresponding acid. The acid is the pyridinium cation, which is formed by the protonation of pyridine.
Now, the equilibrium between the pyridine (base) and the pyridinium ion (acid):
C₅H₅N + H₂O ⇌ C₅H₅NH⁺ + OH⁻
The equilibrium constant expression for this reaction can be expressed as:
Kb = [tex]\frac{([C_5H_5NH^+][OH^-])}{[C_5H_5N]}[/tex]
At equilibrium, the concentration of OH⁻ will be equal to the concentration of [C₅H₅NH⁺], as pyridine is a weak base and will not significantly dissociate in water.
Kb = [tex]\frac{[OH^-]^2}{[C_5H_5N]}[/tex]
Kb = [tex]10^{(-8.77)[/tex]
Kb = [tex]\frac{[OH^-]^2}{[C_5H_5N]}[/tex]
[tex]10^{(-8.77)[/tex] = [tex]\frac{[OH^-]^2}{(0.20 M)}[/tex]
[OH⁻]² = [tex]10^{(-8.77)[/tex] ₓ 0.20 M
[OH⁻] = [tex]\sqrt{10^{-8.77} \times 0.20M}[/tex]
[OH⁻] ≈ 1.42 x 10⁻⁵ M.
The pOH (the negative logarithm of the hydroxide ion concentration):
pOH = [tex]-log_{10}([OH^-])[/tex]
pOH = [tex]-log_{10}[/tex](1.42 x 10⁻⁵)
pOH ≈ 4.85
Since pH + pOH = 14, the pH:
pH = 14 - pOH
pH = 14 - 4.85
pH ≈ 9.26
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The atom is neutral because
(10 Points)
O protons
neutrons
O
electrons =neutrons
protons -electrons
O nucleus = electron
Y
Answer:
the answer is B
Explanation:
When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges
What does reflection mean?
Answer:
the throwing back by a body or surface of light, heat, or sound without absorbing it.
"the reflection of light"
Explanation:
i hope this helps