develop a theory. develop a hypothesis. support a hypothesis
Energy is just like water, cycles through ecosystems.
True or false?
Answer:
true
Explanation:
I think
True or false: this reaction is balanced.
2C2H6(g) + 70215)
True
4CO2(g) + 6H20(3)
False
Answer:
false
Explanation:
i did it
What is the noble gas electron configuration of bismuth (Bi)?
Answer:
The chemical symbol for Bismuth is Bi. Electron Configuration and Oxidation States of Bismuth. Electron configuration of Bismuth is [Hg] 6p3. Possible oxidation states are +3,5.
what is the similarities of freezing of water and electrolysis of water
Answer:
Electrolysis of water is the process of using electricity to decompose water into oxygen and hydrogen gas. Hydrogen gas released in this way can be used as hydrogen fuel, or remixed with the oxygen to create oxyhydrogen gas, which is used in welding and other applications.Ordinarily, the freezing point of water and melting point is 0 °C or 32 °F. The temperature may be lower if supercooling occurs or if there are impurities present in the water which could cause freezing point depression to occur. Under certain conditions, water may remain a liquid as cold as -40 to -42°
Explanation:
A liquid solvent is added to a flask containing an insoluble solid. The total volume of the solid and liquid together is 80.0 mL. The liquid solvent has a mass of 21.0 g and a density of 0.865 g/mL. Determine the mass of the solid given its density is 2.00 g/mL.
Answer:
111.44 g
Explanation:
We'll begin by calculating the volume of the solvent. This can be obtained as follow:
Mass of solvent = 21 g
Density of solvent = 0.865 g/mL.
Volume of solvent =?
Density = mass /volume
0.865 = 21 /volume of solvent
Cross multiply
0.865 × volume of solvent = 21
Divide both side by 0.865
Volume of solvent = 21 / 0.865
Volume of solvent = 24.28 mL
Next, we shall determine the volume of the solid. This can be obtained as follow:
Volume of solvent + solid = 80.0 mL.
Volume of solvent = 24.28 mL
Volume of solid =?
Volume of solid = (Volume of solvent + solid) – (Volume of solvent)
Volume of solid = 80 – 24.28
Volume of solid = 55.72 mL
Finally, we shall determine the mass of the solid. This can be obtained as follow:
Density of solid = 2.00 g/mL.
Volume of solid = 55.72 mL
Mass of solid =.?
Density = mass / volume
2 = mass of solid / 55.72
Cross multiply
Mass of solid = 2 × 55.72
Mass of solid = 111.44 g
Therefore, the mass of the solid is 111.44 g
Determine the Concentration of the Unknown Strong Acid
In this activity you will use the virtual lab to determine the concentration of a strong monoprotic acid. To do this, you can perform
a titration using NaOH and phenolphthalein found in the virtual lab. (Note: The concentration of the acid is between 0.025M and
2.5M so you will need to dilute the NaOH solution so that the volume to reach the endpoint is between 10 and 50 mL).
Once you have determined the concentration of the acid, please enter your answer into a form at the bottom of this page.
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Lab
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Unknown Acid Problem
Stockroom
Workbench 1
Solutions
Glas
Tools
MacBook Pro
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12. Which formula shows a substance that is not molecular?
H₂
H2O
н
CO2
Answer:
the answer is H ..............
Calculate the pH of a 0.35 mol/L solution of butanoic acid
Answer:
2.6
Explanation:
Step 1: Given and required data
Concentration of butanoic acid (Ca): 0.35 MpKa of butanoic acid: 4.82Step 2: Calculate the acid dissociation constant (Ka) of butanoic acid
We will use the following expression.
pKa = -log Ka
Ka = antilog - pKa
Ka = antilog -4.82 = 1.51 × 10⁻⁵
Step 3: Calculate [H⁺] of the solution
For a weak acid, we can use the following expression.
[H⁺] = √(Ca × Ka)
[H⁺] = √(0.35 × 1.51 × 10⁻⁵) = 2.3 × 10⁻³ M
Step 4: Calculate the pH of the solution
pH = -log [H⁺] = -log 2.3 × 10⁻³ = 2.6
6. What is the total number of valence electrons in an
atom of germanium in the ground state?
Answer:
4⁺
Explanation:
Germanium (Ge) has an atomic number of 32 and belongs to group 14 on the periodic table. Germanium has an electronic configuration of [Ar] 3d¹⁰ 4s² 4p². There exist 32 electrons in its neutral atom. In fluorescent lights, germanium is utilized as a component of both alloys and phosphorus.
The electrons in the atom's outer shell are known as its valence electrons.
Thus, at the ground state, the outer shell of the Germanium atom has 4 electrons.
Arrange the following molecules in order of decreasing polarity of their bonds.
a. PBr3
b. SF2
c. H2O
d. NCl3
Answer:
SF2 > H2O > PBr3 > NCl3
Explanation:
Compare the electronegativity values for the atoms and classify the nature of the bonding based on the electronegativity difference.
P has an electronegativity of 2.1, while Br has an electronegativity of 2.96. The difference is 0.86, indicating that these atoms will form covalent bonds.
S has an electronegativity of 2.58 while F has an electronegativity of 4.0. The difference is 1.42, indicating that these atoms will form polar covalent bonds.
O has an electronegativity of 3.5 while H has an electronegativity of 2.1. The difference is 1.4, indicating that these atoms will form polar covalent bonds.
N has an electronegativity of 3.04, whereas Cl has an electronegativity of 3.5. This difference of 0.46 indicates that these atoms will form covalent bonds.
We know that the greater the electronegativity, the higher the polarity. In decreasing order of polarity, we have:
SF2 > H2O > PBr3 > NCl3
1 point
What is the correct balanced equation for the double displacement
reaction provided?
CaBr2+2NaOH???
a) CaBr2+2NaOH
>CaNa
+ BrOH
b) CaBr2
+ NaOH → Ca(OH)2
+NaBr
c) CaBr2 NaOH> CaBr2
+NaOH
d)CaBr2
+ 2NaOH
→ Ca(OH)2
+2NaBr
Option A
Option B
Option C
Option D
Answer:
Option D
Explanation:
A double displacement reaction is a type of reaction in which two reactants exchange ions to form two new compounds.
CaBr2 + 2NaOH → Ca(OH)2 + 2NaBr
Calcium Bromide + Sodium Hydroxide = Portlandite + Sodium Bromide
Intramolecular forces of attraction are important in holding large molecules together.
a. True
b. False
Answer:
False. Intermolecular forces of attraction are important in holding large molecules together.
Explanation:
Within a molecule, atoms are held together by intramolecular forces. That is, intramolecular forces are the attractive forces that hold the atoms or ions that make up chemical substances (elements and compounds) together, forming a chemical bond.
On the other hand, intermolecular forces are those that act on different molecules or ions and that make them attract or repel each other. In other words, intermolecular forces are those that occur between the different molecules of a compound, and cause these molecules or ions to attract or repel each other.
So, intermolecular forces of attraction are important in holding large molecules together.
The citric acid cycle has a catabolic role, oxidizing acetate into CO2 and generating energy, and an anabolic role.
a. True
b. False
What is the name of this compound?
Answer:
THERE IS NOTHING MENTION HERE HOW CAN ANYONE KNOW ABOUT IT?]
Explanation:
Of course, most of us know the reaction between Coca Cola and Mentos. So please can someone provide a chemical equation which contains the ingredients in Coca Cola and Mentos that will make it to foam?
Answer:
As the Mentos candy sinks in the bottle, the candy causes the production of more and more carbon dioxide bubbles, and the rising bubbles react with carbon dioxide that is still dissolved in the soda to cause more carbon dioxide to be freed and create even more bubbles, resulting in the eruption
Difference between the hydrocarbons...Need help asap
Explanation:
Hydrocarbons are defined as organic compounds which are only made from carbon and hydrogen atoms.
There are mainly 3 types of hydrocarbons:
Alkanes are the type of hydrocarbons where a single bond is present between the carbon atoms. The general formula for these is [tex]C_nH_{2n+2}[/tex], where 'n' is the number of carbon atoms.Alkenes are the type of hydrocarbons where at least one double bond is present between the carbon atoms. The general formula for these is [tex]C_nH_{2n}[/tex], where 'n' is the number of carbon atoms.Alkynes are the type of hydrocarbons where at least one triple bond is present between the carbon atoms. The general formula for these is [tex]C_nH_{2n-2}, where 'n' is the number of carbon atoms.HI(aq)+H2O(l)→ H3O+(aq)+I−(aq)
Match the words to the appropriate blanks in the below sentences.
a. The Bronsted-Lowry ace is :_________
b. The Bronsted-Lowry base is :_________
c. The conjugate acid is :_________
d. The conjugate base is:________
1. H2O(l)
2. HI(aq)
3. I^-
4. H2O^+
Answer:
Given chemical reaction is:
HI(aq)+H2O(l)→ H3O+(aq)+I−(aq)
a. The Bronsted-Lowry ace is :_________
b. The Bronsted-Lowry base is :_________
c. The conjugate acid is :_________
d. The conjugate base is:________
Explanation:
According to Bronsted-Lowry acid-base theory,
an acid is a substance, that is a proton donor.
A base is a proton acceptor.
The conjugate acid is formed from the base after gaining a proton.
The conjugate base is formed from the acid after losing a proton.
For the given reaction,
a. The Bronsted-Lowry acid is :__HI(aq)_______
b. The Bronsted-Lowry base is :_H2O(l)________
c. The conjugate acid is :___H3O+(aq)______
d. The conjugate base is:___I-(aq)_____.
Answer:
Explanation:
Bronsted -Lawry acid are hydrogen ion donators . Here HI is Bronsted -Lawry acid.
HI ⇄ H⁺ + I⁻
Bronsted -Lawry base are those which can accept hydrogen ion .
I⁻ + H⁺ ⇄ HI .
Conjugate acid -base pair are shown below .
H₃O⁺ = H⁺ + H₂O .
conjugate acid conjugate base .
( strong acid ) ( weak base )
13. What does the Law of Conservation of Mass state?
help!! An atomic number of 4, an atomic mass of 8 and a charge of +1.
Answer:
berylium
Explanation:
atomic number 4 atomic mass 8 and charge +1
Avagadro’s number:
A: Is constant irrespective of mass of the gases
B: Varies according to the mass of the gases
C: Varies according to the pressure on the gases
D: All of the Above
Answer:
A: Is constant irrespective of mass of the gases
Explanation:
Avagadro's number, denoted by nA, is a number that represents the units in one mole of any substance. The number is 6.02214076 × 10²³ and the units can be atoms, molecules, ions, formula units etc.
That is;
1 mole of a substance = 6.022 × 10²³atoms, molecules, ions, electrons etc.
It is important to note that the Avagyadro's number is constant irrespective of mass of the gases that are involved.
The molecules you use in a chemical reaction are called the:
The reaction of bromine gas with chlorine gas, shown here, has a Keq value of 7.20 at 200°C. If a closed vessel was charged with the two reactants, each at an initial concentration of 0.200 M, but with no initial concentration of BrCl, what would be the equilibrium concentration of Br2, Cl2 and BrCl(g)?
Br2(g) + Cl2(g) ↔ 2BrCl(g) K = 7.20
Answer:
[tex][Cl_2]=[Br_2]=0.856M[/tex]
[tex][BrCl]=0.229M[/tex]
Explanation:
Hello there!
In this case, for this chemical equilibrium problem, it turns out possible for us to solve for the equilibrium concentrations by firstly setting up the equilibrium expression:
[tex]Keq=\frac{[BrCl]^2}{[Cl_2][Br_2]}[/tex]
Thus, by plugging in an ICE chart, in terms of x (reaction extent), we can write:
[tex]7.20=\frac{(2x)^2}{(0.200-x)^2}[/tex]
And could be solved for x as follows:
[tex]\sqrt{7.20} =\sqrt{\frac{(2x)^2}{(0.200-x)^2} } \\\\2.68=\frac{2x}{0.200-x} \\\\x=0.1146M[/tex]
Therefore, the equilibrium concentrations turn out to be:
[tex][Cl_2]=[Br_2]=0.200M-0.1146M=0.856M[/tex]
[tex][BrCl]=2*0.1146M=0.229M[/tex]
Regards!
Reaction of 2,3-dimethyl-1-butene with HBr leads to an alkyl bromide, C6H13Br. On treatment of this alkyl bromide with KOH in methanol, elimination of HBr occurs and a hydrocarbon that is isomeric with the starting alkene is formed. What is the structure of this hydrocarbon, and how do you think it is formed from the alkyl bromide
Answer:
See explanation and image attached
Explanation:
The image attached shows the entire scheme of reactions mentioned in the question.
The first reaction is an addition reaction which yields a tertiary alkyl halide as shown in accordance with Markovnikov rule.
The second reaction is a dehydrohalogenation in which the base abstracts a proton from the alkyl halide followed by loss of a bromide ion to yield the corresponding alkene.
This alkene is an isomer of the starting material.
Which of the following explains the high boiling
point of water?
a Surface tension
b Polarity
C Capillary action
d Hydrogen bonding
Answer:
The correct answer is - d. hydrogen bonding.
Explanation:
Water has strong hydrogen bonds between its molecules that require a very high amount of energy in order to break. Water molecules are joined together or bound with a strong intermolecular force called hydrogen bonds.
These bonds require more kinetic energy which means more temperature or heat in order to break the bonds and turn into steam and this is the reason it has a high boiling point.
someone answer please
Answer:
A
Explanation:
I NEED THIS NOW NO LINKS OR ILL REPORT PLZZZ
What is an example of a chemical property?
Odensity
O reactivity
Omalleability
O solubility
Which statement is not true for an electrochemical cell?
Electrons must flow through a separate path from the reaction solutions.
The metals that form the electrodes must be identical.
Nonparticipating ions must flow to keep the electrons electrically neutral.
An oxidation-reduction reaction must occur.
Answer:
B
Explanation:
C and D is correct
To be clear that electrochemical is science that study the exchange conversion of chemical energy and electric energy through redox reaction
As c is salt bridge
And d is electrochemical define
A is correct as the electricity transfer in electric wire not in solution so its B) un correct
The statement which is not true about the electrochemical cell is option B, the metals that form the electrodes cannot be identical.
What is an electrochemical cell ?In an electrochemical cell, two different metals or metal ions are typically used as the electrodes. These electrodes are placed in separate compartments, which contain the reaction solutions and are connected by a salt bridge or porous membrane.
During the cell's operation, electrons flow through an external wire or circuit, from the anode (where oxidation occurs) to the cathode (where reduction occurs), and nonparticipating ions flow through the salt bridge or porous membrane to maintain charge neutrality.
An oxidation-reduction reaction must occur to generate an electrical potential difference between the two electrodes, driving the flow of electrons through the external circuit. Therefore, options A, C, and D are true for an electrochemical cell. Hence, B is incorrect.
Find more on electrochemical cells:
https://brainly.com/question/12034258
#SPJ3
In what form is energy that is NOT used for life processes released from living things?
1. Thermal energy
2. Chemical energy
3. Light energy
4. Sound energy
Answer:
Correct answer would be Option 2, Chemical Energy
Hope this helps!
Disadvantages of modern periodic table?
Answer:
It has its elements with mass numbers phrased in many decimal places, it requires one to round off to get the actual value.
The atomic numbers of some elements such as Protonium were just guessed.
rank in order the strongest to the weakest acid cbr3cooh, ch3cooh and ccl3cooh
Answer: Rank in order the strongest to the weakest acid is [tex]CCl_{3}COOH[/tex] > [tex]CBr_{3}COOH[/tex] > [tex]CH_{3}COOH[/tex].
Explanation:
More readily a substance is able to donate a hydrogen ion more will be its acidic strength. Hence, stronger will be the acid.
More is the electronegativity of atoms attached to the acid more easily it will donate a proton. Hence, more will be its acidic strength.
Chlorine is more electronegative in nature as compared to bromine. So,
[tex]CCl_{3}COOH[/tex] is more acidic than [tex]CBr_{3}COOH[/tex].
Since there is no electronegative group attached to [tex]CH_{3}COOH[/tex] so it is least acidic than [tex]CCl_{3}COOH[/tex] and [tex]CBr_{3}COOH[/tex].
Thus, we can conclude that rank in order the strongest to the weakest acid is [tex]CCl_{3}COOH[/tex] > [tex]CBr_{3}COOH[/tex] > [tex]CH_{3}COOH[/tex].
