plz, help me I'm so confused!
(this is also science)
Answer:
Well, there is no photo...
Explanation:
Calculate the pH for the following weak acids
.01M Formic acid (HCHO2) aka= 1.7 x 10^-4
Answer:
pH = 2.88
Explanation:
For a weak acid solution, the pH can be calculated using the following formulas:
[H⁺] = [tex]\sqrt{Ka*C}[/tex]pH = -log[H⁺]Where Ka = [tex]10^{-pKa}[/tex] and C is the molar concentration.
We are given Ka and C by the problem, meaning we can now proceed to calculate [H⁺]:
[H⁺] = [tex]\sqrt{1.7*10^{-4}*0.01}[/tex] [H⁺] = 0.0013 MFinally we calculate the pH:
pH = - log (0.0013) = 2.88Which of the following environments are low-level areas that can be temporarily or seasonally filled with water?
Rainforest
Swamp
Tundra
Wetland giving brainlist HAS TO BE RIGHT
Answer:
Rainforest
Explanation:
Swamps are permanently filled with water
and Tundras are dry and cold so the answer should be Rainforest
Answer:
its rainforest it's a it's
Explanation:
Which expression represents the concentration of OH– in solution?
a. 10–14 / [H3O+]
b. [OH–] / 10–14
c. 10–14 – [H3O+]
d. 10–14 x [H3O+]
A cylinder of compressed gas rolls off a boat and falls to the bottom of a lake. Eventually it rusts and the gas bubbles to the surface. A chemist collects a sample of the gas with the idea of trying to identify the gas. The wet gas collected occupies a volume of 283 mL at a pressure of 745 torr and temperature of 28.0oC. The vapor pressure of water at 28.0oC is 0.0372 atm. 1. Calculate the volume (L) that the gas occupies after it is dried (the water vapor removed) and stored at STP. Tries 0/99 The mass of the dry gas is 905 mg. A fragment of the tank indicates that the gas is a monoatomic element. 2. Write out the full name of the gas.
Answer:
See explanation
Explanation:
From the information given;
We convert the pressure from torr to atm as follows;
745 torr * 1 atm/760 torr = 0.98 atm
Initial pressure P1 = 0.98 atm - 0.0372 atm = 0.9428 atm
Initial volume V1= 283 mL
Initial temperature T1 = 28.0oC + 273 = 301 K
Final volume V2 = ??
Final Temperature T2 = 273 K
Final pressure P2 = 1 atm
From the general gas equation;
P1V1/T1 = P2V2/T2
P1V1T2 = P2V2T1
V2 = P1V1T2/P2T1
V2 = 0.9428 * 283 * 273/1 * 301
V2 = 241.99 mL or 0.24 L
If 1 mole of gas occupies 22.4 L
x moles of gas occupies 0.24 L
x = 1 mole * 0.24 L/ 22.4 L
x = 0.0107 moles
But number of moles = mass/molar mass
molar mass = mass/number of moles
molar mass = 905 * 10^-3g/0.0107 moles
molar mass = 84 g/mol
The monoatomic gas is Krypton
How many grams of Mn are there in 5.09 moles of Mn?
grams
Explanation:
n=m/M
m=n*M
m=5,09 mol * 54,9g/mol
m= 279,4g
[tex]\text{mass of Mn = 5.09 mol Mn} × \frac{\text{54.94 g Mn}}{\text{1 mol Mn}}[/tex]
[tex]\boxed{\text{mass of Mn = 279.6 g}}[/tex]
Hybridization of Al in AlF3
Answer:
Hybridization of Al in AlF3 solid is sp3d2.
Which of the following compounds is least soluble in water?
A) iron (III) chloride
B) ammonium acetate
C) sodium hydroxide
D) magnesium carbonate
Answer:
B
Explanation:
Calculate the number of miles of magnesium,chlorine, and oxygen atoms in 5.00 moles of magnesium perchlorate
Answer:
5.00 mol Mg
10.0 mol Cl
40.0 mol O
Explanation:
Step 1: Given data
Moles of Mg(ClO₄)₂: 5.00 mol
Step 2: Calculate the number of moles of Mg
The molar ratio of Mg(ClO₄)₂ to Mg is 1:1.
5.00 mol Mg(ClO₄)₂ × 1 mol Mg/1 mol Mg(ClO₄)₂ = 5.00 mol Mg
Step 3: Calculate the number of moles of Cl
The molar ratio of Mg(ClO₄)₂ to Cl is 1:2.
5.00 mol Mg(ClO₄)₂ × 2 mol Cl/1 mol Mg(ClO₄)₂ = 10.0 mol Cl
Step 4: Calculate the number of moles of O
The molar ratio of Mg(ClO₄)₂ to Cl is 1:8.
5.00 mol Mg(ClO₄)₂ × 8 mol O/1 mol Mg(ClO₄)₂ = 40.0 mol O
What chemical test to differentiate propane and propene
Answer:
If you add bromine water, an aqueous solution of bromine, to the test tubes, you can tell which is propene, the alkene. The bromine reacts with and saturates the double bonds in alkenes, and so decolourises.
please give brainly
Eaterfication experiment
Answer:
Do you mean Esterification experiment?
Explanation:
What is the relative atomic mass of an element
whose isotopic composition is 90% of 20x and 10% of 22x
Answer:
20.2 amu.
Explanation:
Let A represent isotope ²⁰X
Let B represent isotope ²²X
From the question given above, the following data were obtained:
For Isotope A (²⁰X):
Mass of A = 20
Abundance (A%) = 90%
For Isotope B (²²X):
Mass of B = 22
Abundance (A%) = 10%
Relative atomic mass (RAM) =?
The relative atomic mass (RAM) of the element can be obtained as follow:
RAM = [(Mass of A × A%)/100] + [(Mass of B × B%)/100]
RAM = [(20 × 90)/100] + [(22 × 10)/100]
RAM = 18 + 2.2
RAM = 20.2 amu
Thus, relative atomic mass (RAM) of the element is 20.2 amu
A student uses 200 grams of water at a temperature of 60 °C to prepare a saturated solution of potassium chloride , KCI. Identify the solute in this solution.
1. H2O(l)
2. KCl (aq)
3.K + (aq)
4.KCl(s)
Answer:
4. KCl(s)
Explanation:
KCl is an ionic salt that dissolves in water to form a KCl aqueous solution.
A solution is defined as the homogeneous mixture of one or more solutes dissolved in a solvent. Here in the saturated solution of potassium chloride, the solute is KCl. The correct option is 4.
What is a solute?A solute is defined as the substance which is dissolved in a solution. In a solution the amount of the solute present is always smaller than the amount of the solvent. For example in a salt solution, salt dissolves in water and therefore salt is the solute.
The particles of the solute present in a solution cannot be seen by our eye. The solute from a solution is not possible to separate by filtration. In an unsaturated solution, the concentration of the solute is much lower than that of the concentration of the solvent.
A solution is a combination of the solute and the solvent.
Thus the correct option is 4 - KCl.
To know more about solute, visit;
https://brainly.com/question/13812915
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When you're just chilling in the pool and then you think about this:
Explanation:
Sonic is my bf forever, back off
Answer:
oof I always lose on video games so I just quit
In scientific notation, the number 0.00262 is expressed as
Answer:
2.62*10^-3
Explanation:
To do this by hand, you need to understand the rules of scientific notation.
Answer:
0.00262 in scientific notation is 2.62 x 10^-3
What is created when an acid is mixed with a base?
Answer:
If you mix equal amounts of a strong acid and a strong base, the two chemicals essentially cancel each other out and produce a salt and water. Mixing equal amounts of a strong acid with a strong base also produces a neutral pH (pH = 7) solution.
Acid formulas usually start with ______________ because they have hydrogen atoms combined with other atoms in their molecules
Answer:
H
Explanation:
Example,
HCl for hydrochloric acid
H2SO4 for sulphuric acid
HNO3 for nitric (v) acid
What happened during the fusion reaction shown? 2H Зн 4He neutron O A. Two H nuclei fused into one He nucleus. O B. One He nucleus split into two H nuclei. O C. The nuclei that fused lost all their neutrons. D. The nuclei that fused lost some of their protons.
Answer: C.
Explanation:
two H nuclei fused into one He nucleus
Answer: A!
Explanation: just did it
someone help with this will mark brainliest
Answer:
The main difference between emission and absorption spectra is that an emission spectrum has different coloured lines in the spectrum, whereas an absorption spectrum has dark-coloured lines in the spectrum.l
Write a word equation and a skeleton equation for the chemical reaction.
A. Solid iron reacts with aqueous copper(ii) nitrate to produce solid copper and aqueous iron(ii) nitrate.
bond. Water is a polar solvent. The oxygen atom, being more electronegative, attracts the electron cloud toward itself. As the electron cloud is pulled by the oxygen atom, it carries a partial negative charge, and the hydrogen atoms carry a partial positive charge. This partial separation of charges in the water molecule makes it polar. Which intermolecular forces contribute to the dissolution of NaCl in water
Answer:
NaCl and water: Ion - Dipolo forces
NaCl and Hexane: Ion-ion force between Na+ and Cl− ions and London dispersion force between two hexane molecules
Explanation:
NaCl and water:
The ion-dipole force is established between an ion and a polar molecule. Polar molecules are dipoles, they have a positive end and a negative end.
H2O has an important charge separation in its atoms (the H has a positive partial charge and the O has a negative partial charge) and this causes permanent electrical dipoles in the water molecules.
Sodium chloride is an ionic compound formed of positive and negative charge ions, Na + and Cl-. Depending on their charge, these ions will be attracted to opposite charges in the water molecules (H attracts chloride ions and O attracts sodium ions), causing the salt to dissolve in water.
Explanation:
What is neutralisation reaction? Give an example with reaction involved. State two uses of neutralisation reaction in everyday life.
Answer:
neutralization reaction is when an acid and a base react to form water and salt and involves the combination of hydrogen ions and hydroxyl ions to generate water. The neutralization of a strong acid and strong base has a pH equal to 7.
how the proton H gradient is used to make ATP
Answer:
The proton gradient produced by proton pumping during the electron transport chain is used to synthesize ATP. Protons flow down their concentration gradient into the matrix through the membrane protein ATP synthase, causing it to spin (like a water wheel) and catalyze conversion of ADP to ATP.
What is another name for heat?
A
light energy
B.
infrared energy
C
Thermal energy
D
electromagnetic energy
Answer:
C
Explanation:
thermal energy is the another name for heat
Which property increases as you move down a column in the periodic table?
A) atomic size
B) ionization energy
C) nonmetallic character
D) none of the above (all increase as you move down a column).
Answer:
A) atomic size
Explanation:
A sample of copper has a density of 10.50g/cm3 and measures of 0.400 dm long,20.0 mm high and 0.003 m thick. What is the mass in grams of this block of copper metal?
Electricity is possible because atoms release and absorb which sub-atomic particle?
Answer:
Electrons
Electric charge is carried by subatomic particles such as electrons and protons, which can be created and destroyed. For example, when particles are destroyed, equal numbers of positive and negative charges are destroyed, keeping the net amount of charge unchanged.
If a compressed air cylinder for scuba diving contains 6.0 L of gas at 18°C and 200 atm pressure, what volume does the gas occupy at 1.0 atm and 25°C?
Answer:
[tex]V_2=1228.9L[/tex]
Explanation:
Hello there!
In this case, given the pressure, temperature and volume of the gas, we notice that we need the combined ideal gas as shown below:
[tex]\frac{P_2V_2}{T_2} =\frac{P_1V_1}{T_1}[/tex]
Thus, solving for the final volume, V2, we would obtain:
[tex]V_2=\frac{P_1V_1T_2}{T_1P_2}[/tex]
Now, we plug in the data and make sure the temperature must be in Kelvins to obtain:
[tex]V_2=\frac{200atm*6.0L*(25+273)K}{(18+273.15)K(1.0atm)}\\\\V_2=1228.9L[/tex]
Best regards!
In an ocean wave, what happens to a water molecule after it transfers its kinetic energy to another water molecule?
In sound waves, energy is transferred through vibration of air particles or particles of a solid through which the sound travels. ... In water waves, energy is transferred through the vibration of the water particles.
If the pH of a solution is 1.5 , calculate [H^ + ] .
Help plz??
Answer: Thus hydrogen ion concentration is 0.031622777
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
[tex]pH=-\log [H^+][/tex]
Putting in the values:
[tex]1.5=-\log[H^+][/tex]
[tex][H^+]=10^{-1.5}=0.031622777[/tex]
Thus hydrogen ion concentration is 0.031622777