Answer: The hydroxide concentration of this sample is [tex]3.85\times 10^{-7}[/tex]
Explanation:
When an expression is formed by taking the product of concentration of ions raised to the power of their stoichiometric coefficients in the solution of a salt is known as ionic product.
The ionic product for water is written as:
[tex]K_w=[H^+]\times [OH^-][/tex]
[tex]7.7\times 10^{-14}=[H^+]\times [OH^-][/tex]
As [tex][H^+]=[OH^-][/tex]
[tex]2[OH^-]=7.7\times 10^{-14}[/tex]
[tex][OH^-]=3.85\times 10^{-7}[/tex]
Thus hydroxide concentration of this sample is [tex]3.85\times 10^{-7}[/tex]
Help please due today
Answer:
It takes millions of years to form,
Compressing on the ocean floor.
Then one day they come to shore
and sediments they are no more.
They can sometimes tell of life before
with layers, fossils and much more! this is the rock formation
it's not a decoration .
Explanation:
Please help me thanks so much....I’ll mark you?!?!:)))) (15 points)
Answer:
a penny that has turned green
Explanation:
a chemical change is when a substance combines with another to form a new substance. the other answer choices doesn't form a new substance.
What is the movement of air during the day where land and water meet? Cooler sea air moves toward land, where conduction from the land warms it. , . Direction cannot be predicted; it must be observed. . Cooler air over land moves toward the water, where it is warmed by radiation.
I hope I'm not late, but it's "Cooler air over land moves toward the water, where it is warmed by radiation."
What happens to thermal energy during a chemical reaction?
Answer:
Chemical reaction often involved changes energy due to the breaking and formation of bonds. Reaction in which energy is released are exothermic reaction,while those that take in heat energy are endothermic.
Please help me thanks so much....I’ll mark you?!?!:)))) ( 15 points)
Answer:
the first one
Explanation:
TiCl4+H2O-->TiO2+HCl I need to balance this
Answer: The answer is TiCl4 + 2H2O --> TiO2 + 4HCl
Explanation: Every element is equal on both sides.
Ti- 1 Ti-1
Cl- 4 Cl-4
H- 4 H-4
O- 2 O-2
1. 2.50 g of hydrogen gas is heated from 17.0°C to 23.0°C. The specific heat capacity of hydrogen is 14.267 J/g C. How much energy is absorbed?
Answer:
Q = 214.005 J
Explanation:
Given that,
Mass, m = 2.5 g
The hydrogen gas is heated from 17.0°C to 23.0°C.
The specific heat capacity of hydrogen is 14.267 J/g C.
We need to find how much energy is absorbed.
The formula for the energy absorbed is given by :
[tex]Q=mc\Delta T\\\\Q=2.5\times 14.267 \times (23-17)\\\\Q=214.005\ J[/tex]
So, the required energy is 214.005 J.
Propane is often used in stoves and cooktops as a source of heat. The combustion of propane yields water and carbon
unbalanced chemical reaction is represented by the ball-and-stick diagrama shown.
How many molecules of carbon dioxide and water are produced during the combustion of propane? Move numbers to
the equation and show that mass is conserved.
+
+
Propane molecule
Oxygen molecules
Carbon dioxide molecule
Water molecule
Legend
Hydrogen
atom
Oxygen
atom
Carbon
atom
2
3
Answer: 3 molecules of carbon dioxide and 4 molecules of water are produced during the combustion of propane.
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The balanced chemical reaction for combustion of propane is:
[tex]C_3H_8+5O_2\rightarrow 3CO_2+4H_2O[/tex]
3 molecules of carbon dioxide and 4 molecules of water are produced during the combustion of propane.
A chemist dissolves 240mg of pure barium hydroxide in enough water to make up of solution. Calculate the pH of the solution. (The temperature of the solution is .)
Answer:
pH = 12.22
Explanation:
... To make up 170mL of solution... The temperature is 25°C...
The dissolution of Barium Hydroxide, Ba(OH)₂ occurs as follows:
Ba(OH)₂ ⇄ Ba²⁺(aq) + 2OH⁻(aq)
Where 1 mole of barium hydroxide produce 2 moles of hydroxide ion.
To solve this question we need to convert mass of the hydroxide to moles with its molar mass. Twice these moles are moles of hydroxide ion (Based on the chemical equation). With moles of OH⁻ and the volume we can find [OH⁻] and [H⁺] using Kw. As pH = -log[H⁺], we can solve this problem:
Moles Ba(OH)₂ molar mass: 171.34g/mol
0.240g * (1mol / 171.34g) = 1.4x10⁻³ moles * 2 =
2.80x10⁻³ moles of OH⁻
Molarity [OH⁻] and [H⁺]
2.80x10⁻³ moles of OH⁻ / 0.170L = 0.01648M
As Kw at 25°C is 1x10⁻¹⁴:
Kw = 1x10⁻¹⁴ = [OH⁻] [H⁺]
[H⁺] = Kw / [OH⁻] = 1x10⁻¹⁴/0.01648M = 6.068x10⁻¹³M
pH:
pH = -log [H⁺]
pH = -log [6.068x10⁻¹³M]
pH = 12.22A symbiotic relationship in which one organism benefits while the other one is unaffected
A.parasitism
B.mutualism
C.commensalism
I think it's C. commensalism
Answer:
COMMENSALISM IS CORRECT
Explanation:
a 0.555 g sample of mayonnase was burned in excess oxygen inside a bomb calorimeter with a total heat capacity (bomb and water) of 5.20 kh/c. the temperature rose 2.93 c. find the number of dietary calorues in a 10.0 g serving of mayonaise
Answer:
[tex]Dietary\ Calories=65.6kcal[/tex]
Explanation:
Hello!
In this case, since we can see that the heat released by the combustion of the mayonnaise is absorbed by the bomb calorimeter and water, we can set up the following equation:
[tex]m_{mayonnaise}q_{mayonnaise}=C\Delta T[/tex]
Whereas q for mayonnaise stands for the heat due to its usage; thus, we plug in to obtain:
[tex]q_{mayonnaise}=\frac{5.20kJ/\°C*2.93\°C}{0.555g} \\\\q_{mayonnaise}=27.45\frac{kJ}{g}[/tex]
Now, if 10.0 g are eaten, the energy provided by it turns out:
[tex]E_{mayonnaise}=27.45kJ/g*10.0g\\\\E_{mayonnaise}=274.5kJ[/tex]
And we need that value in dietary calories, 1 kcal:
[tex]Dietary\ Calories=274.52kJ*\frac{1kcal}{4.184kJ}\\\\ Dietary\ Calories=65.6kcal[/tex]
Best regards!
There are many important laws and theories in science. Which of the following is a law of science?
A living thing is made of at least one cell.
An atom is made of electrons orbiting a nucleus.
Gravity will pull two objects toward each other.
Natural selection will change species to fit their environments.
Answer: Gravity will pull two objects toward each other
Explanation:
Answer:C
Explanation:Gravity
The student is now told that the four solids, in no particular order, are magnesium bromide (MgBr2), sugar (C6H12O6), butanoic acid (C3H7COOH), and potassium bromide (KBr). Assuming that conductivity is correlated to the number of ions in solution, rank the four substances based on how well a 0.20 M solution in water will conduct electricity. Rank from most conductive
Answer:
MgBr2 > KBr > C3H7COOH > C6H12O6
Explanation:
A strong electrolyte is a solution that dissociate completely in solution. A weak electrolyte does not dissociate completely in solution. The more the number of particles in solution, the more the conductivity of the solution.
For the substances Lister in the question;
MgBr2(aq) ------> Mg^2+(aq) + 2Br^-(aq)
KBr(aq) -----> K^+(aq) + Cl^-(aq)
C3H7COOH(aq) ------->C3H7COO^-(aq) + H^+(aq) (poorly dissociates)
C6H12O6 does not dissociate because it is molecular
A species of butterfly lives in a warm climate. The butterflies feed on the nectar of tropical flowers. Birds eat the butterflies, and they prefer to eat the butterflies with brighter wings.
20 points
What would most likely cause this species to become extinct?
a mutation resulting in darker wings
a decrease in the birds that eat the butterflies
the destruction of the butterflies’ environment
overproduction of butterfly offspring
Answer: the destruction of the butterflies’ environment
Explanation:
A mutation that would result in darker wings will mean that the birds that prey on them will stop eating a lot of them so this won't lead to extinction.
A decrease in the birds that eat the butterflies will also mean that the butterflies will survive more because they will have less predators.
Overproduction of butterfly offspring means more butterflies so they will not go extinct.
If their habitat was destroyed however, the butterflies might find it hard to survive as any new environment they go to might not be suitable leading to their extinction.
Answer:
I believe it is c
Explanation:
From the chair conformation, rotate about the carbon-carbon bonds of the ring to form a boat conformation. In the boat conformation carbon atoms 1 and 4 are both above (they could also both be below) the plane described by carbon atoms 2, 3, 5 and 6. Look through each of the C-C bonds in the cyclohexane ring. Do you observe any eclipsing interactions?
how many electrons are shared in the bond between a hydrogen atom and a cardon atom in a molecule?
Answer:
It forms from two hydrogen atoms, each with one electron in a 1s orbital. Both hydrogen atoms share the two electrons in the covalent bond, and each acquires a helium-like electron configuration.
An alcohol is 62.04 % C and 10.43 % H by mass. The rest is oxygen. What is the empirical formula of the alcohol
Answer: The empirical formula is [tex]C_3H_6O[/tex]
Explanation:
If percentage are given then we are taking total mass is 100 grams. So, the mass of each element is equal to the percentage given.
Mass of C = 62.04 g
Mass of H = 10.43
Mass of O = (100-(62.04+10.43)) g = 27.53 g
Step 1 : convert given masses into moles.
Moles of C = [tex]\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{62.04g}{12g/mole}=5.17[/tex]moles
Moles of H =[tex]\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{10.43g}{1g/mole}=10.43moles[/tex]
Moles of O = [tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{27.53g}{16g/mole}=1.72moles[/tex]
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For C = [tex]\frac{5.17}{1.72}=3[/tex]
For H = [tex]\frac{10.43}{1.72}=6[/tex]
For O =[tex]\frac{1.72}{1.72}=1[/tex]
The ratio of C :H : O= 3: 6 : 1
Hence the empirical formula is [tex]C_3H_6O[/tex]
What do you make when you dissolve sugar in water?
A. A solubility
B. A solute
C. A solution
D. A solvent
Answer:
Answer is c.
Explanation:
when you mix sugar with water,the sugar dissolves to make a transparent solution.
I hope it's helpful!
Calculate the energy required to heat of ethanol from to . Assume the specific heat capacity of ethanol under these conditions is . Be sure your answer has the correct number of significant digits.
Answer:
17 kJ
Explanation:
Calculation for the Calculate the energy required to heat 0.60kg of ethanol from 2.2°C to 13.7°C.
Using this formula
q = mC∆T
Where,
q represent Energy
m represent Mass of substance=0.60kg=600g
C represent Specific heat capacity=2.44J·g−1K−1.
∆T represent change in Temperature=2.2°C to 13.7°C.
Let plug in the formula
q=(0.60 kg x 1000 g/kg)(2.44 J/gº)(13.7°C-2.2°C)
q = (600g)(2.44 J/gº)(11.5º)
q=16.836 kJ
q= 17 kJ (Approximately)
Therefore the energy required to heat 0.60kg of ethanol from 2.2°C to 13.7°C will be 17 kJ
What happens in a chemical reaction?
A
Substances change in appearance but not in chemical composition.
B
Substances change from solid to liquid or gas.
C
Substances interact to form one or more new substances.
D
New atoms are created or destroyed.
okay this is not school related but how do you not fall for some one so hard .
Answer:
Love is not only the thing in this world!
Study hard, you can choose a better way of life.
Before bonding, the atom’s electrons spend most of their time ___________________ the nuclei of each atom.
Answer:
Around.
Explanation:
A chemical formula helps scientists to show or illustrate the type and number of atoms present in a particular molecule or compound by using numerical subscript, ions and atomic symbol of a chemical element.
This ultimately implies that, a chemical formula is used to describe or denote the exact amount of atoms that make up a molecule or compound.
The type of bond which is formed when the atoms of a chemical element are sharing electrons is known as covalent bond. Thus, when two (2) atoms of a chemical element comes close together, the nucleus of one of the atom attracts the other atom's electrons.
However, before bonding takes place, the atom's electrons spend most of their time around the nuclei of each atom.
How hot will a 2.5 L balloon have to get to expand to a volume of 5 L? Assume that the initial temperature of the balloon is 22 C?
The final temperature : 317 °C
Further explanationGiven
V₁=2.5 L
V₂ = 5 L
T₁ = 22 + 273 = 295 K
Required
The temperature, T₂
Solution
Charles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
Input the value :
T₂ = (T₁ x V₂) : V₁
T₂ = (295 x 5) : 2.5
T₂ = 590 K = 317 °C
Two parents who are both Gg (Bb) for a gene are crossed. The genetic makeup of the offspring is that some will be Gg and some gg.
Question 2 options:
True
False
Answer:
false
Explanation:
The genotype of 50% of offspring will be Gg, 25% will be gg, and 25% will be GG. Hence, it is true.
What is a genotype?An organism's genotype is made up of all of its genetic components. The alleles or variations that an individual carries in a specific gene or genetic region are also referred to as the genotype. In other words, it is the genetic makeup of an organism. Phenotypes are determined by genotypes.
There are three different genotype types: homozygous dominant (PP), homozygous recessive (PP), and heterozygous (Pp). Examples of genotypes are hair color, skin color, height, hair texture, and blood group.
When two parents who are both Gg (Bb) for a gene are crossed, then the genotype of their offspring will be GG, gg, Gg. Hence, it is true.
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What are the steps through which a water particle travel as it made one complete trip through the water cycle?
A main group element with the valence electron configuration 3s23p1 is in periodic group __________. It forms a monatomic ion with a charge of ________.
A main group element with the valence electron configuration 4s24p5 is in periodic group _________. It forms a monatomic ion with a charge of __________ .
Answer:
Follows are the solution to this question:
Explanation:
Please find the complete question in the attachment file.
In option a)
In the periodic group of [tex]3s^2 \ 3p^1[/tex] main group component to valence electronic structure (IIIA group) and Aluminum (Al). The monatomic ion forms a load of (+3)
In option b)
The Chlorine within the periodic group (VIIA group) is the main group element for valence electron configuration [tex]3s^2\ 3p^5[/tex] (Cl). It constitutes a monatomic ion with a load of (-1).
Electron configuration is the arrangement and distribution of electrons of an atom in an atomic orbital or of a molecule in a molecular orbital.
They are arranged according to the energy levels known as 1, 2, 3, 4, 5, and in the shells namely K, L, M, N.
1.The correct answers for the blank are:
blank 1: III A groupblank 2: +3In the periodic group III A the element with electronic configuration
[tex]3s^{2} 3p^1[/tex]
is aluminium (Al) and the monatomic ion formed will be +3 charge.
2. The correct answers for the blank are:
blank 1: VII A groupblank 2: -1Chlorine (Cl) is the main group element with electronic configuration of
[tex]4s^{2} 4p^5[/tex]
and the charge of the monatomic ion is -1.
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in a covalent bond, the electrons are _____
Explanation:
In a covalent bond the electrons are simultaneously attracted by the two atomic nuclei.
In a covalent bond the electrons are; simultaneously attracted by the two atomic nuclei.
What is Covalent bonding?Covalent bonding can be defined as the sharing of electrons between two atoms.
The Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally.
We know that
Polar covalent bond is defined as a chemical bond in which electrons are shared unequally or unevenly between two atoms.
Non-polar covalent bond is defined as a chemical bond in which electrons are shared evenly or equally between two atoms.
Therefore, In a covalent bond the electrons are; simultaneously attracted by the two atomic nuclei.
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Three electron(s) are removed from a silicon atom. Enter the chemical symbol of the element.
Answer:
Na (sodium)
Explanation:
An atom, which is the smallest indivisible particle of an element, contains three sub-atomic particles namely: proton, electron, and neutron. An atom is said to be neutrally charged if it contains a charge 0.
In a neutral atom, the number of electrons and the number of protons in an element are equal. These numbers are called the ATOMIC NUMBER. That is, in a neutral atom;
proton no. = electron no. = Atomic no.
Hence, in this case where Silicon atom has an electron number of 14. If three of this electrons are removed, there will be 11 electrons left, hence, this atom becomes SODIUM element, which has 11 electrons in its atom, with chemical symbol Na.
Which statements describe how heat flows in foil?
Check all that apply.
O Heat flows in all directions.
O Heat flows from left to right only.
The atoms on top of the foil absorb heat first.
O The atoms near the candle absorb heat first.
O Heat flows from the cooler atoms to the warmer
atoms.
O Heat flows from the warmer atoms to the cooler
atoms.
Answer: ADF
Explanation: On my moms it’s right
The statements describe how heat flows in foil are heat flows in all directions, Heat flows from the cooler atoms to the warmer atoms, Heat flows from the warmer atoms to the cooler atoms. Therefore, option A, D and E are correct.
What is heat ?Heat is the result of the movement of kinetic energy within a material or an item, or from an energy source to a material or an object. Radiation, conduction, and convection are the three mechanisms through which such energy can be transferred.
Due to its extraordinary thinness and shine, aluminum foil has special characteristics. It bounces heat waves back outward rather than effectively absorbing or conducting heat. This explains why aluminum foil cools almost instantly after being removed from the oven, even after it has been there for some time.
The majority of the radiation released by a heated object is reflected onto the object when it is wrapped in reflective aluminum foil.
Thus, option A, D and E are correct.
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read the dictionary entry.
spite (n): petty, malicious, or small-minded desire to harm or humiliate
in which sentence is the word spite used as a noun?
a. the two old neighbors continually spite each other with their gaudy yard displays.
b. i did not intend to spite my brother when i beat him in the political debate.
c. the runner completed several victory laps to spite his opponents.
d. sisters played against each other in tennis, but they did it without spite.
Answer:
d. The sisters played against each other in tennis, but they did it without spite.
Explanation:
Answer:
The sisters played against each other in tennis, but they did it without spite
Explanation: