4. describe the relationship between the metal and water in terms of which is exothermic and which is endothermic.
Answers
The relationship between metal and water is highly dependent on the specific metal and the conditions under which they react with water. In general, however, the reaction between metals and water can be either exothermic or endothermic.
For highly reactive metals like sodium or potassium, the reaction with water is highly exothermic, meaning that it releases a large amount of heat. This is because these metals readily react with water to produce hydrogen gas and a highly alkaline solution of metal hydroxide. For example, the reaction between sodium and water can be represented as:
2 Na(s) + 2 H2O(l) → 2 NaOH(aq) + H2(g) + heat
On the other hand, for less reactive metals like copper or silver, the reaction with water is usually endothermic, meaning that it absorbs heat from the surroundings. In these cases, the reaction occurs very slowly or not at all, and the metal may simply become coated with a layer of metal oxide or hydroxide. For example, the reaction between copper and water is relatively slow and can be represented as:
2 Cu(s) + O2(g) + 2 H2O(l) → 2 Cu(OH)2(s)
In summary, the relationship between metal and water in terms of exothermic and endothermic reactions is highly dependent on the specific metal and the conditions under which they react. Highly reactive metals tend to have exothermic reactions with water, while less reactive metals tend to have endothermic reactions or no reaction at all.
Related Questions
A first-order reaction that results in the destruction of a pollutant has a rate constant of 0.1/day. how many days will it take for 68 percent of the chemical to be destroyed?
Answers
In a first-order reaction, it takes 23.02 days for 68 percent of the chemical to be destroyed.
Given,
fee constant for the destruction of pollutant = 0.1/day
We ought to discover the number of days it'll take for sixty eight percent of the chemical to be destroyed.
[A] = [A]₀e^⁻kt
in which [A] is the present awareness, and
[A]₀ is the initial awareness
k is the price of decrement
[A]₀ = 1
[A] = 0.1
Or, t =㏑(10)/k
Or, t = 2.302/zero.1
Or, t = 23.02 days.
for this reason the wide variety of days required for the destruction of sixty eight percent of chemicals is 23 days.
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An object has a mass of 20 g and volume of 10 cm3. Enter the numerical value for the density of the object in units of g/cm3.
Answers
Answer:2g/cm3 is ur answer, hope this helps :)
Explanation: when solving for the density, the formula would be d=m(mass)/v(volume). therefore you need to take the volume and divide that into the mass to get density. in this case your mass is 20 and volume is 10. so you divide those two and you will get your answer of 2g/cm3.
Why are earthworms called as “friends of farmers”? Answer in no less than 4 sentences
Answers
Answer:
Organic matter composted with earthworms, often known as vermicompost, has been demonstrated in studies to have disease-suppressing qualities. The earthworms loosen the soil and enrich it with humus. As a result, they are known as farmer's pals. They help the crops grow healthier and over the time have earned farmers trust.
Explanation:
Hope this helps in some way!
What are the correct number of electrons, protons and neutrons respectively in O^2− ion of the isotope O?
Answers
The number of subatomic particles present in the isotope O⁻² :
Protons = 8 (Z=8)
Electrons = 10
Neutrons = 8
The number of electrons, protons of neutrons for a particular element in its uncharged state can be found out using its Atomic number( as Z = No. of protons).
For the stability of element the number of electrons and the number of protons present in the atom of an element are equal. While the number of neutrons present in the atom can be found out by subtracting the Atomic number from the atomic mass(as A= no. of neutrons + protons)
To attain the stable valence configuration atoms may loose or attain electrons changing them to a charged ion.
The Atomic no.(Z) of Oxygen is 8, the electronic configuration of Oxygen is
2,6 so Oxygen gains 2 e⁻ to attain the stable valance shell 2,8.
Thus Oxygen a charge of 2⁻.
Then,
The number of protons present in the isotope O⁻² is 8 (Z)
The number of electrons present in the isotope O⁻² is 8 +2 = 10 (Due to the gain of the 2 additional e⁻)
The number of Neutrons present in the isotope O⁻² is A -Z; A= 8
Z=8; A=16;
Thus,
The number of Neutrons present in the io, O⁻² is 16-8Z; = 8
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Which of the following statements are true of the maintenance of blood pressure (BP)?
Answers
C. If blood pressure decreases, filtration in the kidneys decreases.
D. If more blood returns to the heart, the ventricles contract more forcefully to pump it out, and this raises blood pressure.
What is the maintenance of blood pressure?The maintenance of blood pressure is defined as the high use of sodium in your diet and the low use of potassium in your diet can cause hypertension. It is also important to use those foods which are free from fats. It is also important that we should use fruits, vegetables, and grains in excessive amounts for the maintenance of blood pressure and for a healthy diet.
High blood pressure 190/110 mm Hg can cause the main vital organs of the body like the brain, heart, and kidney too. There are three factors that contribute to blood pressure which are resistance, blood viscosity, and blood vessel diameter.
So we can conclude that blood pressure is the pressure of circulating blood against the walls of the blood vessels.
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Which of the following statements are true of the maintenance
of blood pressure (BP)? (Read carefully and select all of the correct statements.)
A. Norepinephrine stimulates vasoconstriction in skin, viscera, and skeletal muscles, all of which lower BP.
B. Aldosterone stimulates the reabsorption of Na+ ions by the kidneys, which lowers BP.
C. If BP decreases, filtration in the kidneys decreases.
D. If more blood returns to the heart, the ventricles contract more forcefully to pump it out, and this raises BP.
E. If BP decreases, the kidneys secrete the enzyme renin, which stimulates the secretion of epinephrine to prevent a further decrease.
F. The hormone ANP increases the excretion of K+ ions by the kidneys, which helps conserve water and raise BP.
G. The hormone ADH helps the kidneys conserve water and helps prevent a decrease in BP.
H. The elasticity of the large arteries helps decrease diastolic BP.
If a sample of gas has a volume of 200 ml at a pressure of 700 mm Hg. What will be its pressure if its volume is reduced to 100 ml?
Answers
Meave60
Nov 19, 2015
The new pressure will be
1000 L
, rounded to one significant figure.
Explanation:
Boyle's law states that when a gas is held at a constant temperature and mass in a closed container, the volume and pressure vary inversely. The equation to use is
P
1
V
1
=
P
2
V
2
.
Given
V
1
=
200
mL
×
1
L
1000
mL
=
0.2 L
P
1
=
700 mmHg
V
2
=
100
mL
×
1
L
1000
mL
=
0.1 L
Unknown
P
2
Equation
P
1
V
1
=
P
2
V
2
Solution
Rearrange the equation to isolate
P
2
and solve.
P
2
=
P
1
V
1
V
2
P
2
=
(
700
mmHg
×
0.2
L
)
0.1
L
=
1400 L
, which must be rounded to
1000 L
because all of the measurements have only one significant figure.
How many Joules of heat are needed to melt 3.0 g of ice?
Answers
Answer:A substance must absorb heat energy so that it can melt or boil. The temperature of the substance does not change during melting, boiling or freezing - even though energy is still being transferred
Explanation:imm not sure
a mineral sample from rock unit c has 50,000 atoms of
uranium-235 and 150000 atoms of lead 207
Answers
To calculate the ratio of uranium-235 to lead-207 atoms in the mineral sample, we can use the atomic masses and the concept of radioactive decay.
The ratio of uranium-235 to lead-207 atoms in the mineral sample is 1:3.The atomic mass of uranium-235 (U-235) is approximately 235 atomic mass units (amu), while the atomic mass of lead-207 (Pb-207) is approximately 207 amu.
Given:
Number of uranium-235 atoms = 50,000
Number of lead-207 atoms = 150,000
To find the ratio, we divide the number of uranium-235 atoms by the number of lead-207 atoms:
Ratio = Number of uranium-235 atoms / Number of lead-207 atoms
Ratio = 50,000 / 150,000
Simplifying the ratio:
Ratio = 1/3
Therefore, the ratio of uranium-235 to lead-207 atoms in the mineral sample is 1:3.
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how can splashes from the magnetic stirring of the titration be avoided?
Answers
By using an appropriate stirring bar, adjusting the speed of the stirrer, and using a larger container or filling the container to a lower level, splashes from magnetic stirring during titration can be minimized, ensuring accurate results and a safe laboratory environment.
As per the question given,
Splashes from magnetic stirring during titration can be a common issue in the laboratory that can lead to inaccurate results or even harm to the person performing the experiment. Fortunately, there are several ways to minimize splashes and ensure a safe and accurate experiment.
One of the most effective ways to prevent splashes is to use a stirring bar that is appropriate for the size and shape of the container. A bar that is too large or too small can cause excessive turbulence, leading to splashing. It is also important to ensure that the stirring bar is placed in the center of the container to avoid hitting the sides and causing splashes.
Another way to prevent splashes is to adjust the speed of the magnetic stirrer. A slower speed will reduce the amount of turbulence in the solution, while a higher speed can increase splashing. It is important to find the right balance between the speed of the stirrer and the rate of the titration to avoid excessive splashing.
Additionally, using a larger container than necessary can help prevent splashing. A larger container provides more space for the solution to move, reducing turbulence and splashing. If a larger container is not available, filling the container to a lower level can also help reduce splashing.
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3. Find the molar mass of the following compounds:
a. Ammonia NH3
b. Iron (II) Nitrate Fe(NO3)2
Answers
Answer: a.4
Explanation:
n=1
h=3
You are designing a new product that requires the use of a stable, nonreactive
gas. Which gas would be most suitable?
A. Oxygen, o
B. Fluorine, F
C. Helium, He
D. Hydrogen, H
Answers
The gas which would be most suitable for the product is Helium.
What is a gas?A gas is the third state of matter in which there is little intermolecular bonding between the molecules of the substance. Gases usually occupy their container and usually have low boiling point
Gas most suitableSince Oxygen, Fluorine and Hydrogen are group 6, 7 and 1 respectively. These three gases are reactive and would only be stable when they achieve their stable octet configuration. Whereas, Helium which is a noble gas already has a stable duet configuration and is thus non-reactive.So, the gas which would be most suitable for the product is Helium.
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Adam is a forensic scientist who needs to determine whether the ink use on a questioned document matches that of a pen found at the crime scene. Which of these would be MOST helpful to Adam? A. Infrared light B. Uv light C. Micro-spectrophotometer D. Microscope
Answers
The most helpful to Adam would be Micro-spectrophotometer. Option C.
What is a micro-spectrophotometer?A micro-spectrophotometer is an instrument that allows for the measurement of absorption, transmission, and reflection of light by microscopic samples.
In the case of ink analysis, it can be used to determine the chemical composition of the ink and match it with that of a pen found at the crime scene. It can also determine the aging of the ink, which can help establish the timeline of the document.
While a microscope can provide a visual comparison of the ink, it may not provide the level of detail necessary to make a definitive match. Infrared light and UV light can also be used in ink analysis, but their use is typically limited to specific types of inks and may not be as effective as a micro-spectrophotometer.
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step 2: work backwards and identify the structure of the nitrile that would give the carboxylic acid. the nitrile precursor is:
Answers
The structure of the nitrile that would give the carboxylic acid is a carbon atom triple bonded to a nitrogen atom and single bonded to an alkyl or aryl group. This structure is known as a nitrile group and is represented by the formula -C≡N. The nitrile precursor is the compound that contains this nitrile group and is used to synthesize the carboxylic acid.
For example, if the carboxylic acid is acetic acid (CH3COOH), then the nitrile precursor would be ethanenitrile (CH3CN). The nitrile group in ethanenitrile can be hydrolyzed to form the carboxylic acid group in acetic acid.
In general, the nitrile precursor for a carboxylic acid can be identified by removing the -COOH group from the carboxylic acid and replacing it with a -CN group. This will give the structure of the nitrile precursor that can be used to synthesize the carboxylic acid.
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Temperature is the measurement of how hot or cold something is. Agree Disagree
Answers
Answer:
Agree
Explanation:
Answer:
Agree
Explanation:
How many protons are in the following atom?
Answers
Answer:
This is Lithium and Lithium had 3 protons
Explanation:
Note:The number that is red (3) is the proton number.
The top left number(7) is the nucleon number.
If the question ask the electron number.. It's also 3 because PROTON AND ELECTRON ARE THE SAME
Hope this is correct and helpful
HAVE A GOOD DAY!
Which of the following is an oxidation half reaction
Answers
Answer:
Sn²⁺ → Sn⁴⁺ + 2e⁻
Explanation:
Answer:
The answer is..
Sn²⁺ → Sn⁴⁺ + 2e⁻
I hoped this helped, please let me know if it isn't the right answer btw. :)
Have a wonderful day!
Which step of the Calvin cycle requires no extra energy? - chemiosmosis of ATP - generation of G3P - generation of NADPH - splitting of water - carbon fixation by rubisco - regeneration of RuBP
Answers
Carbon fixation by Rubisco requires no extra energy. This is the first step of Calvin's cycle.
In the Calvin cycle, there are three steps involved:
1. Carbon Fixation: In this step, the carbon molecule is fixed that is the Carbon atom from carbon dioxide is fixed by conjugation with RuBP. In this step, no ATP molecules are required.
2. Reduction: This step involves the reduction of the fixed carbon, into the formation of carbohydrates. This step requires 2 ATP for each G3P molecule.
3. Regeneration of RuBP: This step is used to regenerate the used RuBP molecule used in the first step which is the fixation of carbon. This step requires one ATP per G3P molecule.
Splitting of water and chemiosmosis of ATP aren't steps of the Calvin cycle.
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the diameter of a sodium atom, na, is larger than the diameter of a sodium ion, na , because the sodium ion has
Answers
Na+ has one fewer electron than Na, making it smaller and possessing a higher effective nuclear charge.
The fact that sodium ions have just two electron shells makes them smaller than sodium atoms for the main reason (the atom has three). Because they both have the same number of nucleons, the Na+ ion and Na atom have the same nuclear charge. Na+, on the other hand, has a smaller nuclear charge than Na because it has one fewer electron. Na+ is therefore smaller than Na because there is more attraction on the electrons that are already there. A sodium ion's size is smaller than that of a sodium atom.
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consider a hypothetical reaction in which a and b are reactants and c and d are products. if 23 g of a completely reacts with 28 g of b to produce 18 g of c, how many grams of d will be produced?
Answers
Think about a fictitious process where the reactants are A and B and the products are C and D. The product D will be produced in an amount of 33 g.
23 grams in A.
28 grams in B.
18 grams of C.
D = x gms.
Let's make the following equation:
23 g 28 g 18 g x g?
A+ B= C+ D
2. The Law of Mass states that the total amount of reactants A and B reacted will equal the total amount of products C and D produced.
If x = (23+28) — 18 = 33 g, product D will be produced in an amount of 33 g.
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please answer this for me shehsh
Answers
Answer:
ih2706
Explanation:
A construction worker spilled a bag of powdered chemical, covering both of his arms. he complains of intense pain. what should you do?
Answers
A construction worker spilled a bag of powdered chemical, covering both of his arms . he complains of intense pain ,then in that case , the patient who was exposed to a powdered chemical , it is important to brush the chemical from the skin first ,then irrigate the site with copious ( abundant ,extensive in quantity ) amount of water .
Due to the cleaning of chemical from the hand , it minimize the risk to the hand by removing the extra amount of chemical from the surface and helps in rapid cure .
chemical exposure to the skin :chemical exposure to the skin can cause temporary or permanent health damage .temporary skin damage may occur from exposure to chemicals. for example ,many workers may experience dry ,red ,cracked skin from contact with water ,soaps ,gasoline and certain types of solvents .
Permanent skin damage may occurs if the skin is exposed to a chemical that is known to have a severe impact . exposure to certain chemicals can results permanent loss of skin color .permanent damage may occurs to certain organs also like exposure to certain solvents may results in the permanent loss of skin color .
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Which of the following molecules would have the highest vapor pressure at room
temperature?
CHCI3
CH₂Cl₂
CH3CI
CCI4
CH4
Answers
The molecule that would have the highest vapor pressure at room
temperature is CCl₄ because of its stronger intermolecular bonds and higher boiling point.
The correct option is D.
What is the vapor pressure of a substance?The vapor pressure of a substance is a measure of the tendency of a substance to change to a gaseous state.
The vapor pressure of a substance increases with an increase in temperature.
Also, the stronger the bonds that are present within the molecules of the substance, the higher will be the vapor pressure.
The vapor pressure of a substance is also related to the boiling point of that substance. The higher the boiling point of a substance, the higher the vapor pressure of that substance.
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Earth’s rocks change from one type into another, as described in the rock cycle. TRUE OR FALSE
Answers
Help me please
This is for science
Answers
How long is radioactive waste from nuclear plants radioactive?
a-100 years
b-10,000 years
c-100,000 years
d-1,000 years
Answers
Answer:about 10,000 years b maybe
Explanation:Strontium-90 and cesium-137 have half-lives of about 30 years (half the radioactivity will decay in 30 years). Plutonium-239 has a half-life of 24,000 years. High-level wastes are hazardous because they produce fatal radiation doses during short periods of direct exposure.
The radioactive waste from nuclear plants is radioactive for 10,000 years and the correct option is option B.
What is Radioactive waste?
The waste produced by a nuclear power plant or lab is referred to as radioactive waste. They include radioactive substances that are dangerous to the environment and the majority of biological forms. The wastes degrade over time.
Radioactive wastes are stored to-
allow some radioactive wastes to decay to nonradioactive wastes, reduce transport risks; provide lag storage between waste generator, treatment, and disposal sites; simplify disposal; and manage radioactive wastes until disposal facilities become available.Therefore, the radioactive waste from nuclear plants is radioactive for 10,000 years and the correct option is option B.
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What is the charge of an element with 5 protons, 5 neutrons, 5 electrons?
Answers
Answer:
This element is Boron. The atomic number is 5
Explanation:
Which
element does the electron configuration 1s?2s?2p? represent?
O B
O C
ON
O K
Answers
why is the equilbrium constant of the dissociation of kht equal to the square of the bitartrate concentation
Answers
The equilibrium constant of the dissociation of potassium hydrogen tartrate (KHT) is equal to the square of the bitartrate concentration due to the dissociation of KHT into two hydrogen ions (H+) and bitartrate ions (HC₄H₄O₆⁻) as shown below:
KHT ⇌ H+ + HC₄H₄O₆⁻
Here, the equilibrium constant expression for the dissociation reaction of KHT can be written as follows:
Kc = [H+] [HC₄H₄O₆⁻]/ [KHT]
As we know, KHT dissociates into two moles of bitartrate ion (HC₄H₄O₆⁻) and one mole of hydrogen ion (H+). So, after the dissociation of KHT, the concentration of the bitartrate ion (HC₄H₄O₆⁻) will be double that of the hydrogen ion (H+).
Therefore, the concentration of hydrogen ion (H+) will be equal to the square root of the concentration of bitartrate ion (HC₄H₄O₆⁻).
Hence, Kc = [H+]²[HC₄H₄O₆⁻]/ [KHT] = [HC₄H₄O₆⁻]²/ [KHT]
This is the reason why the equilibrium constant of the dissociation of KHT is equal to the square of the bitartrate concentration.
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Plz help!
What is 1 item that is an element?
Give an example of how the 1 item is an element
Answers
Answer:
its a
Explanation:ok
Answer the questions about the following reaction. 4al(s) + 3o2(g) 2al2o3 (s) how many molecules of o2 are used in the reaction? how many oxygen atoms are required? how many moles of al2o3 are formed? what is the mole ratio of al to o2?.
Answers
The mole ratio of Al to O2 is 4:3
The reaction is 4Al(s) + 3O2(g) -> 2Al2O3(s)
Four molecules of O2 are used in the reaction.
Twelve oxygen atoms are required in the reaction.
2 moles of Al2O3 are formed in the reaction.
The mole ratio of Al to O2 is 4:3, meaning that 4 moles of Al react with 3 moles of O2 to form 2 moles of Al2O3.
It is important to note that these ratios refer to the stoichiometry of the reaction, which is a measure of the relative amounts of reactants and products involved in a chemical reaction. The stoichiometry of a reaction is a fundamental concept in chemistry and is used to predict the amount of products that will be produced from a given amount of reactants, as well as to understand the underlying mechanisms of chemical reactions.
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