Answer:
A lower pH of the mouth creates bad bacteria that eventually lead to decay of the tooth.
It can be prevented by avoiding food that causes acidity.
Explanation:
Tooth decay is caused by the pH level in the mouth dropping below 5.5, meaning it is acidic. It can be prevented by brushing your teeth as toothpaste is an alkali which will neutralise the pH level in your mouth.
Hope this helps
Which equation represents fermentation? 1. C2H4 + H2O → CH3CH2OH 2. C2H4 + HCl → CH3CH2Cl 3. C6H12O6 → 2CH3CH2OH + 2CO2 4. 2CH3CHO → C3H5CHO + H2O
Answer:
3. C6H12O6 → 2CH3CH2OH + 2CO2
Explanation:
In fermentation a catabolic process occurs, where an organic substance (C6H12O6) is transformed into a simpler one (CH3CH2OH), through incomplete oxidation, which does not require oxygen. Sugars are transformed into ethyl alcohol and carbon dioxide.
The equation C₆H₁₂O₆ → 2CH₃CH₂OH + 2CO₂ represents fermentation
What is Fermentation ?Fermentation is an enzyme catalyzed, metabolic process whereby organisms convert starch or sugar to alcohol or an acid anaerobically releasing energy.
In this process a large molecule is broken down to a smaller molecule.
Among the Equations given Equation 3
C₆H₁₂O₆ → 2CH₃CH₂OH + 2CO₂
represents fermentation due to two reasons
It is the process of breaking down of SugarIt is breaking down of a large molecule into smaller molecules.To know more about Fermentation
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Give two examples of solutions that you might find or prepare in a kitchen.
Explanation:
solid liquid
solid gas
liquid solid
why should we store Phosphorus in water
The reason we should store phosphorous in water is because it will ignite on contact with air
Why does diamond not conduct electricity
Answer: no free electrons
Explanation: Diamond is very hard due to the strong covalent bonds and rigid tetrahedral 3d arrangement. It does not conduct electricity, as there are no electrons free to move and carry charge through the structure.
What is the total energy required to break all the bonds in 1 mol propanol,
C3H8O?
Answer:
The total energy to break all the bonds in 1 mole of 1-propanol, C₃H₈O, is 4411 kJ/mol
Explanation:
We note that propanol, C₃H₈O is also known as 1-propanol is written as follows;
CH₃CH₂CH₂OH which gives
CH₃-CH₂-CH₂-OH
Hence, the total number of bonds are;
C-H Bonds = 3 + 2 + 2 = 7
C-O Bonds = 1
O-H Bond = 1
C-C Bonds = 2
The bond energies are as follows;
C-H Bonds = 413 kJ/mol
C-O Bonds = 358 kJ/mol
O-H Bond = 468 kJ/mol
C-C Bonds = 347 kJ/mol
Energy required to break the bonds in 1-propanol is therefore;
C-H Bonds = 413 kJ/mol × 7 = 2,891 kJ/mol
C-O Bonds = 358 kJ/mol × 1 = 358 kJ/mol
O-H Bond = 468 kJ/mol × 1 = 468 kJ/mol
C-C Bonds = 347 kJ/mol × 2 = 694 kJ/mol
The total energy to break all the bonds in 1 mole of 1-propanol = 4411 kJ/mol.
Where do you find the molar mass of an element
Answer:
Mass of a given chemical element or compound divided by the amount of substance.
(g/mol)
A 10.0 g sample of an unknown liquid is vaporized at 120.0°C and 5.0 atm. The volume of the vapour is found to be 568.0 mL. The liquid is determined to be made up of 84.2% carbon and 15.8% hydrogen. What is the molecular formula for the liquid?
Answer:
C8H16
Explanation:
First thing to do here is to calculate the molar mass of the compound
Mathematically;
molar mass = mass/number of moles
we can calculate the number of moles using the ideal gas equation
Mathematically;
PV = nRT
n = PV/RT
where p is the pressure at 5 atm
V is the volume at 568 ml = 568/1000 = 0.568 L
R is the molar gas constant which is 0.0821
T is the temperature which is 120+ 273 = 393k
Inserting these values into the equation, we have
n = (5 * 0.568)/(0.0821 * 393)
n = 0.088 moles
So the molar mass = 10/0.088
= 114 g/mol
Now let’s go to the percentages
C = 84.2/12 = 7.016666666666667
H = 15.8/1 = 15.8
divide by the smallest
C = 7.016666666666667/7.016666666666667 = 1
H = 15.8/7.016666666666667 = 2 approximately
The empirical formula is CH2
So for the molecular formula, we have;
(12 + 2)n = 114
14n = 114
n = 114/14 = approximately 8
So the molecular formula of the liquid will be (CH2)n = C8H16
The mass of an object is measured in _____. liters meters degrees kilograms
which accurately describes development?
Answer:
changing while growing
Explanation:
Answer: the answer is a
In which kingdom do all organisms have cells that lack a cell wall?
fungsi
plants
animals
bacteria
Answer:
The answer is animals
Explanation:
Plants and fungi have a cell wall, and although most bacteria lack a cell wall, the question is asking in which kingdom do ALL organisms lack a cell wall. Hope this helps.
Answer:Bacteria
Explanation:
Consider the intermediate equations: 3 equations.
C(s) + O2(g) --> CO2(g) Delta H1 = -393.5 kJ
2CO(g) + O2(g) --> 2CO2(g) Delta H2 = -566.0 kJ
2H2O(g) --> 2H2(g) + O2(g) Delta H3 = 483.6 kJ
With the overall reaction:
C(s) + H2O(g) --> CO(g) + H2(g) Delta Hrxn = ?
QUESTION 1:
What must be done to calculate the enthalpy of reaction?
The first must be halved.
The first must be reversed.
The second must be halved.
The second must be reversed.
The third must be halved.
The third must be reversed.
QUESTION 2:
What is the overall enthalpy of reaction?
Delta Hrxn = ____ kJ
Answer:
C. The second equation must be halved
D. The second equation must be reversed
E. The third equation must be halved.
Delta Hrxn= 131.3 kJ
Explanation:
The correct answer is -582 KJ.
What is the enthalpy of reaction?
Enthalpy is the heat content of a system.The enthalpy change of a reaction is roughly equivalent to the amount of energy lost or gained during the reaction.A reaction is favored if the enthalpy of the system decreases over the reaction.What is the overall enthalpy of the reaction?
Equal to the sum of the standard enthalpies of the intermediate reaction steps is called overall enthalpyLearn more about enthalpy below,
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1
Net ionic equations remove spectator ions and shows only the chemical species that are involved in the chemical reaction. Write the net ionic equation for the following acid base reaction.
Molecular Equation: 2 HCl (aq) + Mg(OH)2 (aq) → MgCl2 (aq) + 2 H2O (l)
Complete Ionic: 2 H+ (aq) + 2 Cl– (aq) + Mg2+ (aq) + 2 OH– (aq) → Mg2+ (aq) + 2 Cl– (aq) + 2 H2O (l)
Net Ionic Equation: ______________________________________________________
Answer:
The reaction of an acid and a base is called a neutralization reaction. ... However, in the reaction between HCl(aq) and Mg(OH) 2(aq), additional molecules of HCl and ... First, we will write the chemical equation with the formulas of the reactants ... The chloride ions are the only spectator ions I THINKS
Explanation:
An investigation involves determining which metal is better for making pots that will cook food faster.
Action and reaction forces are described by newtons what law of motion
According to Newton, whenever objects A and B interact with each other, they exert forces upon each other. ... These two forces are called action and reaction forces and are the subject of Newton's third law of motion. Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction.
There are total three laws of newtons, first law of newtons, second law of newton and third law of newton. Therefore, action and reaction forces are described by newtons third law of motion.
What is newton's third law?Newton's first law is also called law of inertia. An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.
Third law states that for every action there is an equal and opposite reaction. Third law is applicable in many field of physics. The third law is applicable in the running of rockets. The third law is also used by swimmers during swimming in pool.
Therefore, action and reaction forces are described by newtons third law of motion.
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How many moles of gas are contained in a 60.0L cylinder at a pressure of 200.0 atm and a temperature of 25.0? A.(490.48 mol) B.(590.84 mol) C.(340.56 mol) D.(540.67 mol)
Answer: A. 490.48mol
Explanation:
Using the ideal gas equation; PV =nRT
where P = Presssure = 200 atm
V = Volume = 60L
n = Number of moles
R = Gas constant = 0.08206 L.atm/mol/K
T = Temperature = 25 °C + 273 = 298K
Make "n" the subject of the formular;
n = PV / RT
= 200 x 60 / 0.08206 x 298
= 490.73 mol, which is closest to option A. 490.48mol
a solution of hydrochloric acid contains 1.5 moles of the solute in 2.0 liters of solution. calculate the molarity of this solution
Answer:
0.75 M
Explanation:
Molarity = moles of solute / liters of solution
so;
Molarity = [tex]\frac{1.5 Moles}{2.0 Liters}[/tex]
According to molar concentration, the molarity of this solution is 0.75 molar.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.Substitution in formula gives, molarity= 1.5/2=0.75 M
Thus, the molarity of this solution is 0.75 molar.
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2. Which change in oxidation number indicates
oxidation?
A) -1 to +2
C) -1 to - 2
B) +3 to +2
D) +2 to -3
Answer:
A)
Explanation:
Increasing of oxidation number shows that the process is oxidation(or losing of electrons).
-1 to +2, oxidation number is increased. This is an oxidation process.
-
What does the pH of a solution measure?
O A. Color
O B. Volume
O c. Temperature
O D. Acidity
Answer:
D is the correct answer acidity
Explanation:
pH is the logarithmic measurement of the H3O+-concentration in water solutions.
By definition: pH = -log[H3O+]
Example: [H3O+] = 1.0*10-7 mol/L in neutral, pure water (at 25oC), so
pH = -log(H3O+) = -log(1.0*10-7) = 7.0
When KCl dissolves in water
Answer:
They form K₂O (Potassium oxide) and HCl (Hydrochloric acid). This is because K and H are positively charged and O and Cl are negatively charged and cations only bond with anions.
What is a chemical solution and what are the names of its components?
Answer:
A chemical solution is defined as a homogeneous mixture of two or more substances. There are two components of chemical solution that include solute and solvent.
Solute is the component that get dissolved in another substance and solvent is the substance that dissolve solute.
For example: carbon dioxide in water. Where carbon-dioxide is solute and water is solvent.
You have nitrogen gas (N2) at a pressure of 0.5 atm, a volume of 25000 mL, and a temperature of 300 K, how many grams of nitrogen are present?
Answer:
About 7.109g
Explanation:
25000mL is the same as 25 liters.
[tex]PV=nRT \\\\0.5 (25)=n (0.0821) (300) \\\\n\approx 0.508[/tex]
Multiplying this by the molar mass of nitrogen, you get about 7.109 grams of nitrogen. Hope this helps!
4. Which of these terms describes the process of acid rain wearing away limestone?
Acryptic erosion
B.chemical weathering
C.cryptobiotic weathering
D.chemical erosion
Answer:
B. Chemical weathering
Explanation:
Erosion is the process whereby the soil and rocks are washed away by wind, water, ice or gravity.
Weathering is the process of weakening and breaking down of rocks and minerals either by non-living (abiotic) or living (biotic) factors or by both, such as temperature changes, plants and animals, acids, salts and water, etc.
From the above definitions, it can be seen that acid wearing away limestone is a rock weathering process by a non-living agent, an acid.
Option A is wrong because the process is weathering
Option B is correct because an acid is a chemical and the process involved is weathering
Option C is wrong because an acid is non-living
Option D is wrong because the process involved is weathering
A solution has a pH of 8.4. what is the H+ concentration of the solution?
A solution has a pH of 11. What is the H+ concentration of the solution? Is the solution an acid or base?
Your father goes to the store to buy cleaner to remove such deposits from your bathtub. He has a choice between a product containing lemon juice (H+ =10^-2.5M) and one containing vinegar (H+ = 10^ -3.3M) which product would you recommend he purchase and why?
[H+]=3.98x10^-9
[H+]=10^-pH=10^-8.4
[H+]=10^-11, base
[H+]=10^-pH=10^-11
A solution with a pH of more than 7 is basic.
Lemon juice because it is more acidic
pH of lemon juice: 2.5
pH of vinegar: 3.3
Since the pH of lemon juice is lower, it is more acidic and will be more effective at removing the basic deposits.
this is a multiple choice question. one of the answer from the option given is correct.Could you please help!!My sister needs help but she doesn't trust me '_' why am i even saying this, no one asked
6.What are the main
sources of water pollution?
a) Plastic, paper, metal
b) Snail in water
c) Agriculture, industry and community
C.
i cant explain why..................
Which of the following contribute(s) to most of the mass of an atom?
O A) Protons and electrons
B) Protons only
C) Protons and neutrons
OD) Neutrons only
Answer:
C) protons and neutrons
Explanation:
im pretty sure it is c
ANSWER IT CORRECTLY PLEASE!!
The Osmotic pressure of blood is 7.65 ATM at 310 k. An aqueous solution of glucose is isotonic with blood has the percentage by volume
a.5.41%
b.3.54%
c.4.53%
d.53.4%
Answer:
Explanation:
Pv = n RT
P =7.65, T= 310K, for glucose n = moles= weight/molar mass= weight/180, R is gas constant
7.65* V =W/180 *0.0821 * 310
w/v= 7.65*180/0.0821*310 = 1377/25.45 = 54.10 =5.4%
1. If the potassium hydrogen phthalate is not completely dry, how would it affect the reported molar concentration (molarity) of the NaOH solution in Part A? Explain.
The given question is incomplete. The complete question is as follows.
Pure potassiom hydrogen phthalate is used for standardization of the sodium hydroxide solution. Suppose that the potassium hydrogen phthalate is not completely dry. Will the reported molar concentration of the sodium hydroxide solution be too high, too low, or unaffected because of the moistness of the potassium hydrogen phthalate? Explain please.
Explanation:
When potassium hydrogen phthalate is not completely dry then it means there will be some water present in it. According to this, actual potassium hydrogen phthalate is diluted because of the presence of water molecules.
Hence, 1 mole of potassium hydrogen phthalate needs 1 mole of NaOH. And, at the equivalence point according to the concept of moles:
No. of moles of potassium hydrogen phthalate = No. of moles of NaOH
Also, the titration of potassium hydrogen phthalate concentration is less because of the presence of water then the number of moles of NaOH calculated will be less.
Thus, we can conclude that the molar concentration of the sodium hydroxide solution be too low.
Does the conductivity increase or decrease?
O It increases at first, then decreases.
O It continuously decreases
O It continuously increases
O lt decreases at first, then increases
Answer:
It continuously decreases.
Explanation:
the thermal motion makes the electrons to collide and disturb the free flow. Thus, conductivity is decreased.
Photosynthesis produces (4 points)
carbon dioxide and energy
carbon dioxide and oxygen
glucose and oxygen
glucose and carbon dioxide
(I'm pretty positive it's C, but correct me if I'm wrong)
Answer:
Glucose and oxygen is produced during photosyntheis
Explanation:
Carbon dioxide and water are required for photosyntheis producing oxygen and glucose
Answer:
C.Glucose and oxygen
Respiration occurs in the __________
Respiration occurs in the mitochondria
Answer:
mitochondria
Explanation:
Respiration happens in the cells of plants, animals and humans, mainly inside mitochondria.
