Answer:
3
Explanation:
PH = -Log [H+]
PH = -Log [1 × 10^-3]
PH = -Log [10^-3]
Log (10) = 1
PH = -(-3) Log (10)
PH = 3 × 1
PH = 3
What state of matter has the most kinetic energy?
A gas
B liquid
C solid
Answer:
gaseous state.
Explanation:
that's the answer
Man is circled here in blue in the Quaternary Period. Locate it. Compare the location of man to the entire history of the world (the beginning of the spiral at the bottom left). What do you notice about the amount of water vs the amount of land as you spiral upward? Why do you think that is? What do you notice about the complexity of life as you spiral upward? Why do you think that is?
Answer:The upward spiral theory of lifestyle change explains how positive affect can facilitate long-term adherence to positive health behaviors. The inner loop of this spiral model identifies nonconscious motives as a central mechanism of behavioral maintenance.
Explanation://
Consider the nuclear equation below.
Na-
22Ne +98
0
10
Which is the missing value that will balance the equation?
O-1
O 0
O +1
O +2
Answer:
+1
Explanation:
what would you expect to happen if you put a red blood cell in a glass pure water distilled water g
How many moles of gas are present in the sample of gas occupies that 4.32 L at 1.45 atm pressure and -18oC? (Include your formula used and the set-up.)
The amount of gas present in the sample which occupied the given volume at the given pressure and temperature is 0.3mol.
Ideal Gas LawThe Ideal gas law states "that pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature of gas. It is expressed;
[tex]PV = nRT[/tex]
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant( [tex]R = 0.08206 Latm/molK[/tex]
Given the data in the question;
Volume; [tex]V = 4.32L[/tex]
Pressure; [tex]P = 1.45atm[/tex]
Temperature; [tex]T = -18^oC = 255.15K[/tex]
Amount of gas; [tex]n =\ ?[/tex]
To determine the moles of gas, we substitute our given values into the expression above.
[tex]PV = nRT\\\\1.45atm * 4.32L = n * 0.08206Latm/molK * 255.15K\\\\6.264Latm = n * 20.937609Latm/mol\\\\n = \frac{6.264Latm}{20.937609Latm/mol} \\\\n = 0.3mol[/tex]
Therefore, the amount of gas present in the sample which occupied the given volume at the given pressure and temperature is 0.3mol.
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What is required in addition to oxygen to create a high
temperature flame?
Answer:
Oxygen enrichment of combustion air to increase flame temperatures by reducing the proportion of nitrogen used in the combustion process is of particular value to operators of high-temperature furnaces.
HELP PLS ASAP
how many liters of CO2 are produced when 32.6 liters of propane gas C3H8 reacts with excess oxygen at STP?
C3H8 + 5O2 > 4H2O + 3CO2
_______________________ yield is another name for actual yield
The second name that can be used to describe actual yield is Theoretical yield is another name for the actual yield
What is actual YieldThe actual yield is the amount of product obtained from a chemical reaction and it is lesser or equal to the theoretical yield ( the amount of product that can be obtained from a reaction when all reactants are converted ).
Hence we can conclude that theoretical yield is another name for the actual yield.
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which of the following has the smallest radius? A, Mg B, Na+ C, Na D, Mg+
Answer:
Na+
Explanation:
it is least pull by the nuclear charge
Answer:
Na+
Explanation:
It is posetively charged and in the first column
Write an equation that represents the action in water of hypoiodous acid ( HOI ) as a Brønsted–Lowry acid.
Taking into account the Brønsted-Lowry acid-base theory, the reaction between hypoiodous acid and water is:
HOI + H₂O ⇄ OI⁻ + H₃O⁺
Brønsted-Lowry acid-base theoryThe Brønsted-Lowry acid-base theory (or the Brønsted-Lowry theory) identifies acids and bases based on whether the species accepts or donates protons or H⁺.
According to this theory, acids are proton donors while bases are proton acceptors. That is, an acid is a species that donates an H⁺ proton while a base is a chemical species that accepts an H⁺ proton from the acid.
So, reactions between acids and bases are H⁺ proton transfer reactions, causing the acid to form its conjugate base and the base to form its conjugated acid by exchanging a proton.
Reaction between hypoiodous acid and waterIn this case, the reaction between hypoiodous acid and water is:
HOI + H₂O ⇄ OI⁻ + H₃O⁺
where HOI acts as an acid because it donates a potron, while water acts as a base because it accepts the proton donated by HOI.
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Is the bonding in carbon tetrachloride, CCl4 covalent or ionic? Explain how you know.
Answer:
covalent
Explanation:
It is between two nonmetals so it is covalent. It would be ionic if it were between a metal and a nonmetal.
Carbon tetrachloride, CCl₄ is a colorless organic compound with a sweet smell and is used as a refrigeration fluid. The covalent bonding is seen in the carbon tetrachloride compound.
What is covalent bonding?Covalent bonding is the chemical interaction that has been constituted of electron sharing between the atoms of the elements in the molecule or the compound.
This type of chemical bonding is seen when the difference between the electronegativities between the elemental atom is very small to initiate the electron transfer.
In carbon tetrachloride, carbon has 4 valence electrons whereas chlorine has 1 valence electron in its outer shells. The four Cl shares their electrons with the carbon atom to complete their octet.
Therefore, carbon tetrachloride shows covalent bonding.
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A 0.506 g sample of solid calcium hydroxide was dissolved in some water and then titrated with 28.85 mL of hydrochloric acid to neutralize. What was the molarity of the hydrochloric acid (M)? (Start by writing and balancing the reaction.)
A 0.506 g sample of solid calcium hydroxide was dissolved in some water and then titrated with 28.85 mL of hydrochloric acid to neutralize, then the molarity of HCl is 0.471 M.
How do we calculate molarity?Molarity will be calculated by using the below equation as:
M = n/V, where
V = volume of solvent
n is the moles of solute and it will be calculated by using the below equation:
n = W/M, where
W = given mass
M = molar mass
Given chemical reaction is:
Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O
Moles of Ca(OH)₂ = 0.506g / 74.093g/mol = 0.0068 mol
From the stoichiometry of the reaction:
0.0068 moles of Ca(OH)₂ = reacts with 2×0.0068 = 0.0136 moles of HCl
Given volume of HCl = 28.85mL = 0.02885 L
On putting values on the molarity equation, we get
M = 0.0136 / 0.02885 = 0.471 M
Hence required molarity of HCl is 0.471 M.
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When .080 moles of propane burn at STP, what volume of carbon dioxide is produced?
The answer is 5.4 L (I NEED THE STEPS)
The volume of carbon dioxide produced is : 5.4 L
Given data:
moles of propane = 0.080 moles
Determine the volume of Carbon dioxide producedThe chemical reaction
C₃H₈ + 5O₂ ---- > 3CO₂ + 4H₂O
From the reaction
I mole of C₃H₈ = 3CO₂
0.080 moles of C₃H₈ = 3 * 0.080 = 0.24
Applying the equation below to determine the volume of CO₂
Pv = nRT
= 0.24 * R * T
v = ( 0.24 * 8.314 * 273 ) / 1 atm
= 544.7 ml = 5.4 L
Hence we can conclude that The volume of carbon dioxide produced is : 5.4 L
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A certain orbital has four nodes in total. Which of the following could it be?
-5s
-5p
-5d
-5f
-all
Answer:
5p
Explanation:
We know
Number of Nodes =n-l
i)5s
n=5
l=0
Number of nodes=5-0=5
ii)5p
n=5
l=1
Number of nodes=5-1=4
Hence correct option is option b 5P
Atomic orbitals are the property that explains the position of the electron. 5p orbital has four nodes in total. Thus, option B is correct.
What are nodes?Nodes are the point in the orbit where the electron density is zero and is given by n-1.
In 5s the n = 5, l = 0 so, number of nodes = 5. In 5p, n = 5, l = 1, so nodes = 4. In 5d, n = 5, l = 2, so nodes = 3, and in 5f, n = 5, l = 3 so, nodes = 2.
Therefore, option b. 5p has four orbital nodes.
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What is the numbers of molecules for 65.8g of CO2?
Answer:
One gram of carbon dioxide contains 13.6 x 10²¹ number of molecules.
Explanation:
Answer:
1.50 moles
Explanation:
use dinemential analysis
find the molar mass
A sample 0.5 mole sample of NO2 gas occupies a 0.620 L container at 25 °C. What is the pressure of this gas?
The pressure of the sample of the gas in the container at 25 °C occupying 0.62 L is 19.73 atm
Data obtained from the question Volume (V) = 0.62 L Temperature (T) = 25 °C = 25 + 273 = 298 KGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) = 0.5 mole Pressure (P) = ?Using the ideal gas equation, the pressure of the gas can be obtained as follow:
PV = nRT
Divide both side by V
P = nRT / V
P = (0.5 × 0.0821 × 298) / 0.62
P = 19.73 atm
Thus, the pressure of the gas is 19.73 atm
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How are Jupiter, Saturn, and Uranus similiar? How are Jupiter, Saturn, and Uranus similiar?
Question 5 options:
a They are all large, gaseous planetary bodies.
b They are all planets that are the exact same size.
c They are all the same distance from the sun.
d They all have the exact same surface temperature.
Answer:
a
Explanation:
because they all are gasses
Identify the false statement from the following.
A. London dispersion forces exist in all polar molecules.
B. Temporary charge imbalances in the molecules lead to London dispersion forces.
C. Hydrogen bond is type of dipole – dipole interaction.
D. London dispersion is the weakest among the intermolecular forces.
The false statement from the above is that: Temporary charge imbalances in the molecules lead to London dispersion forces.
What are the factors that affect London dispersion forces?Generally, the factors which affects the London dispersion forces a dispersion force are as follows:
Shape of the moleculesDistance between moleculesPolarizability of the moleculesHowever, London dispersion forces simply refers to a sort of temporary attractive force formed when electrons in two adjacent atoms occupy positions that make the atoms form dipoles.
So therefore, temporary charge imbalances in the molecules lead to London dispersion forces is a false statement
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can u help me with this
Answer:
c
Explanation:
the reason is because your a homosiejenenddj
........................
Answer:
no questions
it's just all dots here
3. Arrange the following according to increasing acid strength
(i) Ka= 2.5 + 10-15
(ii) Ka= 9.0 + 10-9
(iii) pKa= 7.5
(iv) % dissociation =100
(a) iv, iii, ii, i
(b) ii, I, iii, iv
(c) i, iii, iv, ii
(d) i, ii, iii, iv
(e) iii, iv, ii, i
Answer:
3. Arrange the following according to increasing acid strength (i) Ka=2.5x 10-10 (ii) Ka=9.0x108 (iii)pKa= 7.5 (iv)% dissociation -100 (a) iv, iii, ii, i (b) ii, 1, iii, iv (c) i, iii, iv, ii (d)i, ii, iii, iv (e) iii, iv, ii, i
5. Consider the buffer NH/NH.Cl. If one wants to prepare 250.0mL of this buffer at pH 4.0. Is it possible to achieve one's sim? (a) yes (b) no 6. If the pH of the buffer in (5) above would be 9.0, the ratio of NH/NH.Cl required for the preparation, considering I Liter of buffer, is (a) 1.80 (b) 0.56 (c) 4.26 (d) 1.82 x 10: (e) K, (NH -1.8x109)
Explanation:
2.0 L of Carbon dioxide is heated from -25.0 °C to Standard Temperature.
What is the final volume of the gas?
The final volume of the gas that was heated from -25.0 °C to standard temperature is 2.2L.
How to calculate volume?The volume of a given gas can be calculated using the Charles law equation as follows:
V1/T1 = V2/T2
Where;
V1 = initial volumeV2 = final volumeT1 = initial temperatureT2 = final temperatureV1 = 2LV2 = ?T1 = -25°C + 273 = 248KT2 = 273K2/248 = V2/273
273 × 2 = 248V2
546 = 248V2
V2 = 546/248
V2 = 2.2L
Therefore, the final volume of the gas that was heated from -25.0 °C to standard temperature is 2.2L
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A science teacher asked her students to calculate the density of a toy cube. The mass of the cube was 120 grams and the height of the cube was 4 centimeters.
What was the density of the cube in cubic centimeters? (**At least 2 decimal places)
Explanation:
density=> ro=m/V
m=0,12kg
V=0,04m³=6,4.10^-5
=>0,12/6,4.10^-5=1875 kg/m³
- If you have bottle filled with Sulfur Hexafluoride and there are 1.00 L of the liquid with a density of 1.60 g/mL, how many moles of the liquid are present?
Answer:
About 11.0 moles.
Explanation:
We are given a bottle filled with 1.00 L of sulfur hexafluoride (SF₆) and we want to determine the number of moles of the liquid that is present.
First, determine its mass with the given density:
[tex]\displaystyle \begin{aligned}\rho & = \frac{m}{V} \\ \\ m & = \rho V \\ \\ & = \left(\frac{1.60\text{ g}}{\text{mL}}\right)(1.00\text{ L})\left(\frac{1000\text{ mL}}{1\text{ L}}\right) \\ \\ & = 1.60\times 10^3 \text{ g}\end{aligned}[/tex]
The molecular weight of SF₆ is 146.07 g/mol. Hence:
[tex]\displaystyle 1.60\times 10^3\text{ g SF$_6$} \cdot \frac{1\text{ mol SF$_6$}}{146.07\text{ g SF$_6$}} = 11.0\text{ mol SF$_6$}[/tex]
Therefore, about 11.0 moles of sulfur hexafluoride is present.
Which of the following conditions would lead to a small population size? a. a low birth to death ratio b. a high birth to death ratio c. immigration d. large number of resources Please select the best answer from the choices provided A B C D Mark this and return
Answer:
Choice A.
A low birth to death ratio
Explanation:
A low birth to death ratio means that people are dying faster than they are being born. This leads to a decreasing population size.
Answer:
It's A
Explanation:
Example 2- If a weather balloon initially has a volume of 25000mL, but then rises up in the air and its new
pressure is 5atm, and its new volume is 15L, what was its initial pressure?
pressure
Binder
Answer:
3 ATM = INITIAL PRESSURE
Explanation:
P1V1 = P2V2
P1 * 25 = 5 * 15
P1 = 3 ATM
what can you say about the acceleration when the pressure decreases from left to right
When the pressure decreases from left to right, the acceleration also decreases.
What is Acceleration?This is defined as the rate at which velocity changes with time and it has a direct relationship with pressure.
This however means that when pressure decreases there will be a corresponding decrease in acceleration and vice versa.
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When you exercise strenuously, your body produces excess heat. Describe what your body does to help prevent your temperature from rising excessively and
explain why your body's response effective.
Answer:
Your body can cool itself by sweating. When sweat evaporates, it lowers your temperature
Explanation:
what is the pH of a solution that has a [H+]=1.75x10^-11
[tex]pH = - \log[\text{H}^{+}] = -\log \left(1.75 \times 10^{-11} \right) = 10.757[/tex]
Your car breaks down. As your friends help
you puch it, it begins to move and speed
up.
try stopping putting the car in park before fixing
