Answer:
Here's what I get
Explanation:
In a single replacement reaction, one element must displace another element from its compound.
Thus, we must consider the reactivity series, because an element lower down in the series cannot replace one that is above it.
In a double replacement reaction, the cations change partners with the anions. All we need consider are the solubilities of the new cation-anion partners.
In a single replacement reaction, it is mandatory that one element displaces the other according to their reactivity on the reactivity series.
On the other hand, In a double- displacement reaction; the cations just exchange anions and vice versa.
An example of a single displacement reaction is;
A reaction between HCl and Na metal where Na+ ion displaces H+ ion as a result of higher reactivity.An example of a double displacement reaction is;
A reaction between NaOH and HCl to form H2O and NaCl.As such, there's no preference in double displacement reactions as ions are swapped.
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Which of the following best describes a coastal plain?
Will give five stars and mark brainliest
Very high rising area between land and sea
Area near a sea having flat land and low relief
High area adjacent to a sea and bound on one or more sides by cliffs
Raised, flat-surfaced area adjacent to a sea and bound by steep slopes
Answer:
Area near a sea having flat land and low relief.
Explanation:
Just think of a beach, that's a coastal plain, it's usually flat land with low relief.
Final answer:
A coastal plain best describes an area near a sea having flat land with low relief, like the Gulf-Atlantic Coastal Plain, which has gradual slopes and can include estuaries like Chesapeake Bay.
Explanation:
The term coastal plain describes an area near a sea having flat land and low relief. It is characterized by a landscape that slopes very gradually toward the sea, with a rate of elevation change so subtle that it could be just a few feet or even inches per mile. An example of a coastal plain is the Gulf-Atlantic Coastal Plain, which extends across various eastern states in the US and includes notable features such as the entire state of Florida, as well as other areas along the Gulf of Mexico and the Atlantic Ocean. Coastal plains can often be swampy due to their flat nature which doesn't allow water to drain away quickly. They are also where coastal plain estuaries, or drowned river valleys, can be found, such as Chesapeake Bay and Delaware Bay.
Nitric acid (63 g) and sodium hydroxide (60 g) are mixed. how many grams of water will form.?
In the neutralization reaction between nitric acid and sodium hydroxide, 63g of Nitric acid and 60g of Sodium hydroxide would result in 18g of water. The reaction will be limited by the nitric acid acting as the limiting reagent.
Explanation:The question pertains to a neutralization reaction between nitric acid (HNO3) and sodium hydroxide (NaOH). This reaction produces sodium nitrate (NaNO3) and water (H2O) as per the equation: HNO3 + NaOH → NaNO3 + H2O. To find out the amount of water formed, we need to look at stochiometry of the reaction. From the balanced chemical equation, you can see that 1 mole of nitric acid reacts with 1 mole of sodium hydroxide to produce 1 mole of water.
First, we need to convert the weights of the reactants into moles. The molecular weight of HNO3 is approximately 63 g/mol, so 63 g of nitric acid represents 1 mole. The molecular weight of NaOH is approximately 40 g/mol, so 60 g represents 1.5 moles. Therefore, the limiting reagent in this reaction is nitric acid.
As per the stoichiometry of the reaction, 1 mole of nitric acid will produce 1 mole of water. Thus, 1 mole of nitric acid will give 18 g of water (molecular weight of water is approximately 18 g). So, when 63 g (1 mole) of nitric acid is fully reacted, it will produce 18 g of water.
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39. Chromium and chlorine form an ionic compound whose formula is CrCl3. The name of this
compound is
a. chromium (III) chloride
c. monochromium trichloride
b. chromium chlorine
d. chromium(III)trichloride
Answer:
a. chromium (III) chloride
Explanation:
Chromium chloride is also binary ionic compound composed of only two element chromium and chlorine.
When naming these compounds the name of metal or cation is written first and anion is written after the cation. The anions are non meals.
The anion name is end with suffix " ide".
such as chromium chloride.
The (III) shows the oxidation number of metal. In given compound the oxidation state of chromium is +3 while chlorine chow the oxidation state of -1 that's why three chlorine atoms are attached with one chromium atom.
What types of atoms are shown in a skeletal model of an organic molecule?
A. Atoms of every element except carbon
B. Atoms of every element except hydrogen
C. Atoms of every element
D. Atoms of every element except carbon and hydrogen
Answer:
Atoms of every element are shown in a skeletal model of an organic molecule.
Explanation:
Skeletal model of an organic molecule consists of various skeletal atoms that are used in making up of the molecule. Various conventions of hydrogen and carbon atoms are employed in it. The molecules bonding and certain representation of molecular geometry are shown in the structural formula.
Use of skeletal formula is ubiquitous in organic chemistry. Thus, in organic chemistry atoms of every element are shown in the skeletal model of an organic molecule
muutuun
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Describing Enzymes
QUICK CHECK
Which of the following characteristics are true of enzymes? Check all that apply.
The structure of an enzyme can change if conditions change.
A single enzyme can normally catalyze a wide variety of reactions under many conditions.
Enzymes are found only in nonliving systems.
Enzymes allow living things to regulate body conditions through feedback mechanisms.
Enzymes bind to specific substrates in specific ways.
Enzymes increase the rate of reaction.
When shown in energy-reaction diagrams, enzymes represent the higher activation energy.
Enzymes are proteins that can change structure under different conditions, assist in body regulation through feedback mechanisms, bind to specific substrates in specific ways, and increase the rate of reactions. However, they are specific to one reaction, found in living organisms, and represent lower activation energy on diagrams.
Explanation:The following characteristics are true of enzymes:
The structure of an enzyme can change if conditions change. This is due to the fact that enzymes are proteins, and their structure can be affected by external conditions like temperature and pH. Enzymes allow living things to regulate body conditions through feedback mechanisms. They enable the body to respond to changes in the environment by speeding up or slowing down chemical reactions. Enzymes bind to specific substrates in specific ways. This is known as 'enzyme-substrate specificity', and it refers to the fact that each enzyme can only catalyze one particular type of reaction due to the specific shape of its active site. Enzymes increase the rate of reaction. They do this by lowering the activation energy required for a reaction to occur, effectively making the reaction proceed more quickly.
However, some points are incorrect. An enzyme cannot catalyze a wide variety of reactions - it is specific to one type of reaction. Also, enzymes are not found only in nonliving systems; they are a crucial part of all living organisms. Finally, in energy-reaction diagrams, enzymes represent the lower, not higher, activation energy.
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a 160 milligram sample of a radioactive isotope decays to 10 kilograms in 12 years. what is the half life of this element
The half-life of a radioactive isotope is the time it takes for half of the original sample to decay. This can be calculated by measuring how much of the sample remains after a certain period of time. Multiple measurements confirming the same decay period correlate to the half-life of the isotope.
Explanation:Your question relates to the concept of radioactive decay and the calculation of half-life. The specifics in your question seem a bit off; a heavier mass cannot result from decay, as decay processes result in a decrease of mass. However, let's focus on the main part of your question - how to determine the half-life of a radioactive isotope.
The half-life of a radioactive isotope is the amount of time it takes for half of the sample to decay. Given a particular amount of a radioactive substance (expressed in grams, milligrams, or other units), you can determine the number of half-lives by noting how much of the substance remains after a certain period of time.
For example, if you start with 10 grams of a radioactive isotope and after some time you measure and find you only have 5 grams remaining, that period of time would be one half-life for the isotope. If you then waited the same amount of time and found that you had 2.5 grams left, this would confirm the half-life, as again, half the previous amount had decayed. The actual numerical value of the half-life is dependent on the specific isotope and its decay characteristics.
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Elias observed a sample in the classroom. The sample was a liquid at room temperature. He performed a conductivity test and found that it did not conduct electricity. Which classification would best fit the sample?
A) ionic
B) metal
C) nonmetal
D) salt
Answer:
C. nonmetal.
Explanation:
It is not ionic because it did not conduct electricity.
There is only one liquid metal at room temperature and that is mercury, which will conduct electricity.
A salt is usually solid at room temperature and if it is in solution will conduct electricity.
Which of the following electromagnetic waves can create ions?
A. Ultraviolet waves
B. Radio waves
C. Gamma rays
D. Infrared waves
Answer:
C. Gamma rays
Explanation:
Answer:
C. Gamma rays
Explanation:
ap3x
Which chemical equation represents a redox reaction?
Hello. This question is incomplete. The full question is:
"Which chemical equation represents a redox reaction? A. Mg(ClO3)2 + 2HCl → MgCl2 + 2HClO3 B. CO + H2O → H2 + CO2 C. 2NH4NO3 + CuCl2 → 2NH4Cl + Cu(NO3)2 D. Na2SO3 + FeBr2 → 2NaBr + FeSO3 "
Answer:
B. CO + H2O → H2 + CO2
Explanation:
The reactions that involve loss and gain of electrons are called oxide-reduction reactions. In the oxidation reaction, electrons are lost, while the reduction reaction consists of gaining electrons.
Oxidation can occur in three circumstances: when oxygen is added to the substance, when a substance loses hydrogen or when the substance loses electrons. Example: fruit salads tend to darken when they come into contact with air, this is because oxygen acts to promote fruit oxidation. A tip to avoid this is to add lemon or orange juice, as the vitamin C present in citrus fruits prevents the oxidizing action of oxygen on the salad.
Reduction, in turn, is the reverse and also occurs in three ways: when a substance loses oxygen, when it gains hydrogen or when it gains electrons. Example: when the copper oxide (black) is placed in an appropriate apparatus (chamber) for its reduction to occur, the hydrogen gas comes in contact with the super heated copper oxide and, as a result, it loses oxygen and gradually goes away. turning pink as it is being reduced to copper.
An example of a redox reaction is CO + H2O → H2 + CO2
A redox reaction is a reaction that involves the transfer of electrons. An example is the reaction between hydrogen and fluorine, where hydrogen is oxidized and fluorine is reduced.
Explanation:A redox reaction, or reduction-oxidation reaction, involves a transfer of electrons between two species. An example of a redox reaction is the reaction between hydrogen and fluorine:
H2 + F2 → 2HF
In this reaction, hydrogen is oxidized (loses electrons) and fluorine is reduced (gains electrons). Hence this is a redox reaction. You can often identify redox reactions by looking for changes in oxidation states of elements in a reaction.
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Acids have a high pH.
a. True
b. False
Answer:
B. False
Explanation:
In chemistry, pH is a scale used to specify how acidic or basic a water-based solution is. Acidic solutions have a lower pH, while basic solutions have a higher pH. ... The pH value can be less than 0 for very strong acids, or greater than 14 for very strong bases.
Final answer:
Acids have a high PH - b. False
Explanation:
The statement that acids have a high pH is FALSE. In chemistry, the pH scale is used to measure how acidic or basic which also refers to how alkaline a substance is. The pH scale ranges from 0 to 14, with 7 being neutral, numbers below 7 indicating acidity, and numbers above 7 indicating alkalinity.
Generally, acids have a higher concentration of hydronium ions, resulting in a lower pH, typically below 7. Common examples of acids include vinegar and stomach acid, both known for their low pH levels and acidic properties.
based on bond energies, what will be the heat of reaction for the formation of 2 moles of hydrogen fluoride from one mole each of hydrogen gas and fluorine gas?
Answer:
ΔH₍reaction₎ = ΔH₍ hydrogen gas bond-breakage₎ + ΔH₍fluorine gas bond-breakage₎ + 2.ΔH₍hydrogen fluoride bond-formation₎ .
Explanation:
Reaction:
H₂ + F₂ --> 2.HF ΔH₍reaction₎
In this reaction, bonds are broken in the hydrogen gas and fluorine gas molecules which then lead to the new bond formation, that is, bond between hydrogen and fluorine atoms which explains the formation of hydrogen fluoride.
ΔH₍reaction₎ = ΔH₍bond-breakage₎ + ΔH₍bond-formation₎
ΔH₍bond-breakage₎ is just ΔH₍ hydrogen gas bond-breakage₎ + ΔH₍fluorine gas bond-breakage₎.
ΔH₍bond-formation₎ is 2.ΔH₍hydrogen fluoride bond-formation₎ .Since the ΔH₍bond-formation₎ is in the units kJ/mol, a factor of 2 comes in the picture
Therefore,
ΔH₍reaction₎ = ΔH₍ hydrogen gas bond-breakage₎ + ΔH₍fluorine gas bond-breakage₎ + 2.ΔH₍hydrogen fluoride bond-formation₎ .
Note: Care should be taken while assigning opposite signs to ΔH₍bond-breakage₎ and ΔH₍bond-formation₎.
Name the only satellite which is known to have an atmosphere in the planet it orbits
Answer:
titan
Explanation:
in a laboratory the countof bacteria in a certain experiment was increasing at the rate of 5% per hour find the bacteria at the end of 3 hour if the count was initially 250000?
Answer:
289,406.25 ≈ 289,406
Explanation:
We can solve this question in 2 ways: Simple calculation and Using the formula.
Simple Calculation: The rate of increase is 5% per hour. And the initial count was 250,000. Therefore, in the first hour, the increase in the count would be 5% of 250,00, which is [tex]\frac{5}{100}[/tex]×250,000 = 12,500. Therefore, at the end of the first hour, the count would be 250,000 + 12500 = 262,500. Now, for the 2nd hour, the intial count is 262,500 and the increase in count at the end of the 2nd hour would be 5% of 262,500 = [tex]\frac{5}{100}[/tex]×262,500 = 13,125. And the count at the end of the 2nd hour is 262,500+13,125 = 275,625. Similarly for the 3rd hour, the starting count is 275,625 and the increase in count at the end of the 3rd hour is [tex]\frac{5}{100}[/tex]×275,625 = 13,781.25. Thus, the total count at the end of 3rd hour is 275,625+13,781.25 = 289,406.25 ≈ 289,406.
Direct Formula (Actually, it is the compound interest formula): [tex]C(f) = C(i)(1 + \frac{r}{n})^{nT}[/tex] , where C(f) is final count, C(i) is the initial count, r is the rate of increase, n is the number of times rate of increase is applied in a time period, T is the number of time periods. Here, C(i) = 250,000, r is 5% = 0.05, n is one (because 5% increase happens once in one hour) and T is 3 hours. Therefore, [tex]C(f) = 250000(1 + \frac{0.05}{1})^{3} = 250000(1.05)^{3} = 289406.25[/tex].
I NEED HELP PLEASE!!
Calculate the amount of heat absorbed when a 15.5-g ice cube melts. The delta Hfus= 6.02 kj/mol.
Answer:
The amount of heat absorbed is 5.183889 kJ .
Explanation:
In conversion of water to ice it rejects some heat while in conversion of ice to water it absorbs heat which is called latent heat which is given as 6.02 kJ/mol.
The amount of ice given is 15.5 g.
Converting it to moles as the latent heat is given in per moles:
[tex]\frac{given\\weight \\ (in\\grams)}{molecular\\weight\\(in\\grams)}[/tex]
Molecular mass of Hydrogen (H) and Oxygen (O) is 1 u and 16 u respectively.
Molecular mass of water is 18 g ( [tex]H_{2} O[/tex] ⇒ 2*1+16=18 ).
mole = 15.5/18 ≈ 0.8611 moles
Therefore the amount of heat absorbed by 15.5 g of ice ( 0.8611 moles) = Latent heat * moles
Heat absorbed = 6.02*0.8611
= 6.02*(15.5/18)
≈ 5.183889 kJ
the subshells of n = 2?
Answer:
There are two subshells for n=2.
Explanation:
Principal quantum number (n)
It tell about the energy levels. It is designated by n.
For example,
If n =2
It means there are two energy level present.
Azimuthal quantum number (l)
The azimuthal quantum number describe the shape of orbitals. Its value for s, p, d, f... are 0, 1, 2, 3.
(n-1)
2-1 = 1
thus possible values of l = 0,1
it means principle quantum is 2 and subshells are s and p..
What is the source of energy for the Sun?
1 Choice 1
hydrogen fusion
2 Choice 2
internal combustion
3 Choice 3
nuclear fission of metals
4 Choice 4
burning of solar gases
Answer:
Nuclear fusion
Explanation:
Nuclear fusion is the source of Sun's energy.. At the core where temperature and pressure are very high hydrogen atoms fuse into helium atom and release energy in the form of Gama rays.
U test a substance using red litmus paper turns blue based on these results is the substance acidic or base
Answer:
basic in nature
Explanation:
Litmus Test -
It is the very basic test , used to determine if the solution is acidic in nature or is basic in nature .
There are two type of litmus paper available , i.e. , blue and red .
If the solution is acidic in nature ,putting a blue litmus paper turns red ,
and putting a red litmus paper would not show any change .
And , hence it can be concluded that the solution is acidic in nature .
Similarly ,
If the solution is basic in nature ,putting a red litmus paper turn blue ,
and putting a blue litmus paper would not show any change .
And , hence it can be concluded that the solution is basic in nature .
Carbonic acid _____.
is a carbon oxoacid and a chalcocarbonic acid. It has a role as a mouse metabolite. It is a conjugate acid of a hydrogencarbonate. Bicarbonate, or hydrogen carbonate, is a simple single carbon molecule that plays surprisingly important roles in diverse biological processes.
Answer:
Dissolves limestone and other rocks.
Explanation:
you didnt give any choices so i did the best i could
An object starts at position 12 on a horizontal line with a reference point of o. What is the position of the object if it moves 14
units to the left?
0-26
O-2
OOO
Answer:
-2
Explanation:
Consider object is starting 12 units right from the reference point which is 0.
Assign the right direction positive sign.
when object is moving 14 units on left direction the position of object will be two units to the left side of reference point.
Assign the left direction negative sign position will be -2.
The Mid-Atlantic Ridge is a divergent tectonic plate boundary. Two plates are moving _______ each other along this boundary. The result of this motion is that North America is moving _______ Europe.
Answer:
away from; away from
Explanation:
A divergent boundary occurs when two tectonic plates move away from each other. Here two plates are moving away from each other along this boundary. The result of this motion is that North America is moving away from Europe.
What is mid-Atlantic Ridge?The Mid-Atlantic Ridge is defined as the mid-ocean ridge which is located at the bottom of the Atlantic ocean which stretches approximately 16,000 kilometers from north to south. Mid ocean ridges are large central rift valleys which is surrounded by the mountain ranges created by tectonic forces along divergent plate boundary lines.
The divergent plate boundaries exist between the plates which are spreading apart from each other. This occurs due to the convection currents in the mantle rising and impacting beneath the lithosphere before spreading out and dragging plates along with them.
The mid Atlantic range ridge separates the Eurasian, north American and african plates.
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what are the characteristics of a proton
Answer:
A Balanced Atom
Most nuclei also contain neutrons. Perhaps the most essential characteristic of a proton is its positive electrical charge. This charge is equal in magnitude to the negative electrical charge of the electron, which means that the charge of one proton balances out the charge of one electron.
Explanation:
what will react with oxygen to cause combustion
Answer:hydrocarbon
Explanation:it reacts with oxygen to produce water and carbodioxide.
Answer:
hydrocarbon
Explanation:
a p e x :)
The normal boiling point of cyclohexane is 81.0. What is the vapor pressure of cyclohexane at 81.1
Answer:
1 atm
Explanation:
The normal boiling point of a liquid is temperature at which the vapour pressure of the liquid equals 1 atm.
If the normal boiling point of cyclohexane is 81.0 °C, the vapour pressure of the liquid is 1 atm.
The graph below shows that the vapour pressure of cyclohexane reaches 1 atm at about 81 °C.
A 45-kg boy pulls a wagon with a force of 38 N for a distance of 550 m. If the boy
takes 240 s, what is the power expended by the boy?
Answer:
87.08 W
Explanation:
Power expended by the boy is power needed/ power experienced to/by the wagon throughout this process of pulling.
When the force F is constant and the angle between the force and the displacement s is θ, then the work done is given by W = Fs cos θ.
Assuming that the force and displacement of the wagon are in the same direction cos(θ)= cos(0)= 1
So, W= 38 * 550 (SI units)
W=20,900 J
[tex]Power = \frac{Work done}{Time taken}[/tex]
Power = [tex]\frac{20,900}{240}[/tex]
87.08 W
Answer:
The whole answer is 87.08 but rounding to 2 number its 87
Explanation:
Why is liquid displacement the best way to find volume of a sample? Why not just measure with a ruler?
Explanation:
Using a ruler is not ideal for measuring the volume of irregular objects like a random stone. This is because they do not have definite length, width and height dimensions like regular objects eg a block of wood. Measuring the volume of the displaced water (eg using a calibrated cylinder) will give you the volume of the object. Remember an object displaces its own volume of a liquid when fully immersed in the liquid - Archimedes' principle.
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What is wrong with the following structure H-H-O
Answer:
O atom requires 2 electrons to achieve octet structure and in this structure, it is only bonded to one H atom hence only obtaining an additional valence electron. Without a octet structure, the molecule is unstable hence this structure is incorrect. The correct structure should be H-O-H.
Explanation:
To two decimal places, what is the relative
atomic mass and the molar mass of the element potassium,K?
Answer:
The atomic mass of Potassium is 39.09 u+-0.0001u and molar mass is 39.09 g,s/mole
Explanation:
Potassium is a metal belongs to group 1 and period 4 whose atomic number is 19 and electron configuration is 2,8,8,1.
The molar mass of Potassium or K is 39.09 g,s/mole and the atomic mass is 39.09 u+-0.0001u. Potassium was first discovered by Humphrey Davey and was first found in the ashes of plants. It also occurs in the mineral sylvite or KCL and is mined as such.
Answer:
Atomic Mass: 39.0983 u.
Molar mass: 39.0983 g/mol
name the compound CH3CH2CH2C(CH3)2CH2CH3
Answer:
3,3-dimethylhexane
why did you set the limit to 20 characters?
what volume of air at 1 atm would have to be put into a car tire with a volume of 15 L if the pressure in the car tire is to be 30 psi
Answer:
V₂ = 30 L
Explanation:
Given data:
Initial pressure = 30 psi (30 /14.696 = 2 atm)
Initial volume = 15 L
Final volume = ?
Final pressure = 1 atm
Solution;
P₁V₁ = P₂V₂
V₂ = P₁V₁ / P₂
V₂ = 2 atm . 15 L / 1 atm
V₂ = 30 L
A balloon is filled with 0.250 mole of air at 35°C. If the volume of the balloon is 6.23 liters, what is the absolute pressure of the air in the balloon? The absolute pressure of the air in the balloon is kilopascals.
Answer:
102.807 kPa
Explanation:
There are some assumptions to be made in the answer. The air inside the balloon acts as an ideal gas at a given temperature conditions.
Using the combined ideal gas equation.
[tex]PV = nRT\\[/tex]
P= absolute pressure of air inside the balloon.
V= volume of air inside the balloon (6.23 L= 6.23 * 10⁻³ m³)
n= moles of gas(air). (0.250 mol)
R= Universal gas constant ( 8.314 J / mol·K)
T= Temperature in Kelvin
T= 35 + 273.15 = 308.15 K
So, [tex]P = \frac{nRT}{V}[/tex]
[tex]P = \frac{0.250 * 8.314 * 308.15}{6.23 * 10^{-3} }[/tex]
P= 102.807 * 10³ Pa
P= 102.807 kPa
Answer: 103 for Edmentum users !