Answer:
B
Explanation:
I think that the anserw is B.
If the oh- of a solution is 2.7x10-4m the poh of the solution is
Answer:
i dont knoe but yea just on here
Explanation:n:
hi hi hi hi
A small rock with a mass of 13 g is dropped into a graduated cylinder containing 12 mL of water.
The water rises to 35 mL. What is the density of the rock?
The density of the rock with a mass of 13 g and is dropped into a graduated cylinder containing 12 mL of water is 0.57g/mL.
How to calculate density?The density of a substance can be calculated using the following formula:
Density = mass ÷ volume
According to this question, a small rock with a mass of 13 g is dropped into a graduated cylinder containing 12 mL of water. The water rises to 35 mL.
This means that the volume of the rock is 35 - 12 = 23mL
Density of the rock = 13g ÷ 23mL
Density = 0.57g/mL
Therefore, the density of the rock with a mass of 13 g and is dropped into a graduated cylinder containing 12 mL of water is 0.57g/mL.
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What conversion factor would be used to solve the following problem:
Convert 8.99g of CO2 to moles of CO2
A) Molecular weight
B) Avogadro's number
C) Grams
D) Density
A) Molecular weight (MW)
moles = mass : MW
use the equation: 2Mg + O2→ 2MgO
Calculate the number of moles of oxygen needed to react with 6.00 moles of Mg.
Answer:
3 moles of O2 needed
Explanation:
2 moles of Mg to one mole O2
so 3 moles of O2 needed
A 76.89 g sample of a hydrocarbon(CxHy) has a mass of hydrogen that is equal to 10.45 g. Given this information, determine the empirical formula of this hydrocarbon. {MMC=12.01 and MMH=1.008}.
I’ll give the fastest person brainliest!!!!!! I need the answer asap!!!
Answer:
the empirical formula will be CH2
Explanation:
C
[tex] = \frac{66.44}{12} \\ = \frac{5.536}{5.536} \\ = 1 \\ = 1 \\ h \\ \frac{10.45}{1} \\ = \frac{10.450}{5.536} \\ = 1.88 \\ = 2[/tex]
Calculate the cell potential for the galvanic cell in which the given reaction occurs at 25 °C, given that [Cd2+]=0.00190 M and [Au3+]=0.788 M . Standard reduction potentials can be found in this table. 3Cd(s)+2Au3+(aq)↽−−⇀3Cd2+(aq)+2Au(s)
For a [Cd2+]=0.00190 M and [Au3+]=0.788 M conc, the cell potential is mathematically given as
Ecell=1.98V
What is the cell potential for the galvanic cell?Generally, the equation for the Chemical reaction is mathematically given as
Cd2+(aq) + 2e – → Cd(s)
Au3+(aq) + 3e– → Au(s)
Therefore
Ecell=Ecell-0,0582/nlog
Therefore
Ecell=Ered-Eoxy
Ecell=1.498-(-0.403)
Ecell=1.901
In conclusion
Ecell=1,901-0,0592/6log(0,0016/0.88)^2
Ecell=1.98V
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Which of the following potential ligands can form a maximum of two bonds to a metal
ion?
(a) C2042
(b) EDTA
(C) porphine
(d) CO32-
(e) both (a) and (d)
Based on the potential ligands given, C2O42- and CO32- can form a maximum of two bonds to a metal
ion.
What are ligands?Ligands are ion or molecule that binds to a central metal atom to form a coordination complex.
Ligands are essential in many biological and enzyme complexes.
From the potential ligands given;
C2O42- can form can form a maximum of two bonds to a metal ionCO32- can form two a maximum of two bonds to a metal ionEDTA can form five to six bonds to a metal ionPorphine can form one bond to a metal ionTherefore, the potential ligands, C2O42- and CO32- can form a maximum of two bonds to a metal
ion.
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True or False: Based on the evidence in the graph, when 10 g of Ce2(SO4)3 is dissolved in 100 mL of water at 20°C, the solution is said to be unsaturated.
Based on the evidence in the solubility graph, when 10 g of Ce2(SO4)3 is dissolved in 100 mL of water at 20°C, the solution is said to be saturated.
What are unsaturated solutions?An unsaturated solution is a solution which contains less solute than it can actually dissolved in a given volume of solvent at a given temperature.
A solubility curve or graph provides information about the solubility of a solute at a given temperature.
From the solubility graph given, at 20°C, less than 10 g of Ce2(SO4)3 will be dissolved in 100 mL of water.
Therefore, when 10 g of Ce2(SO4)3 is dissolved in 100 mL of water at 20°C, the solution is said to be saturated.
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Write the essential condition for the following reaction to take place:2AgBr—->2Ag+Br
This is the decomposition of silver bromide
Silver bromide decomposes to give silver and bromine
Sunlight is the decomposing agent .
The reaction takes place in sunlightHence it should be placed in sunlightAnswer:
Sunlight
Explanation:
For silver bromide (AgBr) to decompose into silver metal and bromine gas, it can only take place in the presence of sunlightThe balanced reaction :⇒ 2AgBr → 2Ag + Br₂Which form of water is classified as part of the precipitation phase of the water cycle?
A:lakes
B:vapor
C:rivers
D:snow
Answer:
Snow
Explanation:
Precipitation means when water falls from the sky, and snow is frozen water
Calculate the specific heat in J/(g·ºC) of an unknown substance if a 2.50-g sample releases 12.0 cal as its temperature changes from 25.0ºC to 20.0ºC. ________J/(g·°C)
The specific heat of an unknown substance is 0.96 J/(g·ºC).
What is the specific heat capacity?The specific heat capacity of a substance can be described as the quantity of heat needed to raise the temperature in one unit of substance by 1 degree Celcius.
Whenever the heat is lost or absorbed there is a change in the temperature of the substance:
Q = mCΔT
Given, the amount of energy released, Q = 12 cal
The initial temperature of the substance = 25.0ºC
The final temperature of the substance = 20.0ºC
The change in the temperature of a substance, ΔT = 25 -20 = 5°C
The mass of the substance, m = 2.50 g
We have to find the specific heat capacity of an unknown substance.
12 cal = 2.50 g × C × 5°C
C = 0.96 J/(g·ºC)
Therefore, the specific heat capacity of an unknown substance is equal to 0.96 J/(g·ºC).
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The amount of heat needed to raise a substance's temperature by one degree Celsius per gram is known as specific heat. The specific heat in J/(gºC) of an unknown substance is 0.96 J/gºC.
The amount of heat needed to increase the temperature of the entire substance by one degree is the heat capacity of a substance. Specific heat capacity is what is used when the substance's mass is equal to one.
The hydrogen bonds in water, which account for its high specific heat.
The expression used to calculate the specific heat capacity is:
Q = mcΔT
Here Q = 12 Cal
m = 2.50 g
T₁ = 25.0ºC
T₂ = 20.0ºC
ΔT = 5°C
12 cal = 2.50 g × c × 5°C
c = 0.96 J/gºC
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What is the term used to describe why urban areas are warmer than surrounding rural areas?
Question 2 options:
Downtown island effect
Rural cooling effect
Global warming effect
Urban heat island effect
Answer:
urban heat island
Explanation:
occurs when a city experiences much warmer temperatures than nearby rural areas.
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What mass, in grams, of sodium sulfate is needed to make 230.5 g of a 3.5 % (m/m) aqueous solution of sodium sulfate?
The percent concentration of a solution can be calculated from; mass of solute /mass of solution * 100. The mass of the solute here is 8.1 g.
What is concentration?The term concentration refers to the amount of solute presnt in a solution. There are many ways of expressing concentration such as molarity, molality and percentage.
Here;
mass of solution = 230.5 g
Percent of solute = 3.5 %
3.5 = x/ 230.5 * 100
3.5 = 100x/230.5
230.5(3.5) = 100x
x = 230.5(3.5) /100
x = 8.1 g
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Human colour vision is “produced” by the nervous system based on how three different cone receptors interact with photons of light in the eye. These three different types of cones interact with photons of different frequency light, as indicated in the following chart: Cone Type Range of Light Frequency Detected S 6.00-7.49 x 1014 s-1 M 4.76-6.62 x 1014 s-1 L 4.28-6.00 x 1014 s-1 What wavelength ranges (and corresponding colours) do the three types of cones detect?
The colors and the corresponding wavelengths the three types of cones detect are:
Blue: 450–495 nmGreen: 495–570 nmRed: 620–750 nmWhat is the role of cones in Human vision?Human vision refers to the ability of humans to see and visualize objects in the environment in terms in texture, color, pattern, etc.
The cells of the human eye responsible for vision are the rods and cones.
The cones are responsible for color-vision while rods are responsible for black and white vision.
The three types of cones detect blue, green, and red colors corresponding to wavelengths given below:
Blue: 450–495 nmGreen: 495–570 nmRed: 620–750 nmTherefore, the cones in the eye detect blue, green and red colors.
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The solubility of magnesium fluoride, , in water is g/L. What is the solubility (in grams per liter) of magnesium fluoride in 0.29 M of sodium fluoride,
Answer:
1.457*10^-8 grams
Explanation:
First we want to find the molar concentration of MgF2. We can do this by dividing 0.016 (the solubility in grams of MgCl2 in a litre of water) by its molar mass (approx. 62.3 grams). Thus, the molar solubility of MgF2 is 2.57*10^-4 M.
Next, we must calculate the Ksp of MgF2. The equilibrium expression is:
MgF2⇄Mg+2F
Thus [tex]Ksp=[Mg^+][F^-]^2[/tex]
This means that, in equilibrium, there are 2.57*10^-4 M of [tex]M^+[/tex] and 5.136*10^-4 M of [tex]F^-[/tex]
Plugging in the above information, our Ksp for MgF2 is approximately 6.78*10^-11
Next we will need to use the RICE table. Since there is already 0.29M of NaF dissolved, there is initially 0.29M of [tex]F^-[/tex].
R: MgF2 ⇄ [tex]Mg^{+}[/tex]+2[tex]F^-[/tex]
I: N/A 0 0.29M
C: N/A +x +x
--------------------------------------------
E: N/A x 0.29+x
To make calculations easier, we will assume that 0.29+x≈0.29
This means that Ksp=0.29x=6.78*10^-11
Therefore, x≈2.338*10^-10M
Multiply that by 62.3 and we get around 1.457*10^-8 grams.
In which pair do both compounds exhibit predominantly ionic bonding?
A. RbCl and CaO
B. Kl and O3
C. Na2SO3 and BH3
D. NaF and H2O
E. PCl5 and HF
Answer:
In pair NaF and H2O both compounds exibit predominantly ionic bonding.
NaF and H[tex]_2[/tex]O exhibit predominantly ionic bonding. Therefore, the correct option is option D among all the given options.
What is ionic bond?Ionic bonding produces ionic, or electrovalent, combinations, which are best represented by compounds created between nonmetals and alkali as well as alkaline-earth metals.
The electrostatic attraction forces among opposing charges as well as repulsion between comparable charges position the ions in such a way that every positive charge is surround by negative ions as well as vice versa within ionic crystal structures of such a type.
In summary, the ions are organized in such a way that negative and positive charges alternate constantly balance one another, resulting in a total charge of zero for the entire material. NaF and H[tex]_2[/tex]O exhibit predominantly ionic bonding.
Therefore, the correct option is option D.
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Which of the following is not true concerning aluminum?
Group of answer choices
Aluminum weighs twice as much as the same size piece of steel.
It takes about two metric tons of aluminum oxide to produce one metric ton of aluminum.
Aluminum corrodes more slowly than iron does.
It takes about 17,000 kilowatt hours of electricity to produce one metric ton of aluminum.
The statement that is true about aluminum is that it corrodes more slowly than iron does.
What is Aluminum?Aluminum is a slivery white metal that have atomic number of 13. It is most coon metal and make more than 8% of the Earth's core mass. It's also the third most common chemical element Earth. It is malleable and soft.
It is use for making kitchen utensils, cans and so on.
Aluminum cannot be decomposed by chemical methods.
Therefore, The statement that is true about aluminum is that it corrodes more slowly than iron does.
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A reversible exothermic synthesis (combination) reaction produces one mole of gaseous product from two moles of gaseous
reactant. Which set of condtions will shift the reaction farthest toward the products?
A)
low temperature, low pressure
B)
low temperature, high pressure
9
high temperature, low pressure
D)
high temperature, high pressure
A 2.0g piece of Mg reacts with HNO3. Which conditions would produce the GREATEST reaction rate?
Factors that will increase product formation are;
low temperature and high pressure increasing the surface area and concentrationWhat factors affect chemical equilibrium?The position of chemical equilibrium is affected by the following factors:
temperature concentration pressure for gasesWhen equilibrium is altered by an external factor, the reaction shifts to annul the effect of that change.
For the reversible exothermic synthesis, low temperature and high pressure will shift the reaction farthest toward the products.
For the reaction of the 2.0g piece of Mg with HNO3. increasing the surface area of magnesium metal as well as increasing the concentration of HNO3 would produce the GREATEST reaction rate.
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What is the unit of force
Answer:
the unit of force is newton represented with symbol "N"
How many joules of heat are giving off when 5.9 g of water cools from 75°C to 25 Celsius
Explanation:
The base form (or root) of a verb is the form listed in the dictionary. It is the version of the verb without any endings (endings such as -s, -ing, and ed). The base form is the same as the infinitive (e.g., to walk, to paint, to think) but without the to.
Which of these are animal adaptations that help animals live in the deciduous forest biome? Select all that apply.
Round builds
Little feet for snow
Harder outer skin to reduce loss of water
Hibernation
Help fast!
Answer:
Hibernation
Explanation:
deciduous means trees that lose leaves during winter
What is the pH when the [H+] is 1 x 10^-3 M
A. 2
B. 3
C. -3
D. 4
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
C17H19NO3 compound, what is the percent by mass of carbon
Answer:
71.58%
Explanation:
Find the Mr of C₁₇H₁₉NO₃ :
(12 × 17) + 19 + 14 + (16 × 3) = 285
Mr of carbon in C₁₇H₁₉NO₃ :
12 × 17 = 204
Percent by mass of carbon = [tex]\frac{204}{285}[/tex] × 100 = 71.58%
When the color changes is it a chemical change or a physical change
physical
It can be chemical but it's usually physical as the molecular structure doesn't change
How can we know if an element is more active than the other one, so that it will displace it in displacement reaction.
Answer:
In a reactivity series, the most reactive element is placed at the top and the least reactive element at the bottom.
HCl(?) + H2O(?) → H3O+(?) + Cl-(?)
What is the phase label for H2O?
Group of answer choices
ℓ
Answer:
Transcribed image text: Answer.
the following question for the mixing of gaseous hydrogen chloride with water to make hydrochloric acid. HCl) + H2O(2) → H30*) + Cl (2) What is the phase label on HCI? aq
In chemistry and biology, hydrolysis refers to a twofold decomposition reaction in which water participates.
The conjugate base in HCl H2O H3O+ Cl is what?HCl's conjugate base is Cl in the reaction HCl+H2O+H3O++.
An acidic solution is created when hydrogen chloride gas and water interact. The reaction's equation is displayed. Cl - + H3O + HCl + H2O
Hydroxide ion is base 2, and its conjugate acid (water) is acid1. Acid1 is HCl, and its conjugate base is base1.
The conjugate base of hydrochloric acid is the chloride ion. The hydroxide ion's conjugate acid is water
H3 O+1 is the conjugate acid of H2 O. The electrical charge on water increases by one when one hydrogen ion is added. Hydrogen is also known as H3 O+1.
In a reversible chemical reaction, H 2O and HCl join upon contact to create hydronium cations [H 3O] + and chloride anions Cl : HCl + H 2O [H 3O] + + Cl. The resulting mixture is a potent acid known as hydrochloric acid.
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3.1.4 Quiz: Covalent Bonds
Question 7 of 10
Choose the statements that are true about hydrogen.
A. Hydrogen has only one electron shell.
B. Hydrogen can bond with oxygen to make water,
C. When hydrogen has eight electrons in its valence shell, it has a
full valence shell.
D. If two hydrogen atoms bond to one oxygen atom, both atoms
have full valence shells.
Answer:
C. When hydrogen has two electrons in its valence shell, it has a full valence shell.
D. Hydrogen can bond with oxygen to make water.
As both C & D are correct, there would be two answers.
Hope this helps!
Explanation:
Answer:
The answer is A: Hydrogen has only one electron shell.
sodium carbonate (+heat) →
Answer:
heat carbunate
Explanation:
thats true im good in here like and heart byebye
What is the numbers of molecules for 65.8g of CO2?
Answer:
8.98*10^23 molecules CO2
Explanation:
The molar mass of CO2 is 44.0 grams/mol. If we convert 65.8 grams of CO2 into moles, 65.8g CO2 / 44.0g CO2 then we get about 1.49 moles of CO2. We know there are 6.02*10^23 molecules in a mole, so we would just multiply 1.49 mol CO2 * 6.02*10^23 = 8.98*10^23
Which one of the following pairs of atoms would form a non-polar covalent bond?
a. Cl and C1
b. Na and Cl
C. C.and o
d. N and O
