Which one of the following is not true about transition metals?
A. They typically have low melting points
B. Their compounds frequently exhibit magnetic properties
C. Their compounds are frequently colored
D. They frequently have more than one common oxidation state
Answers
The statement that is not true about transition metals is:
A. They typically have low melting points.
Transition metals generally have high melting points due to strong metallic bonding. The other statements are true: their compounds often exhibit magnetic properties (B), are frequently colored (C), and have more than one common oxidation state (D).
Out of the given options, A is not true about transition metals. Transition metals are characterized by their ability to form stable ions with incomplete d-orbitals. They typically have high melting and boiling points due to their strong metallic bonding. Their compounds often exhibit magnetic properties due to the presence of unpaired electrons in their d-orbitals. Transition metal compounds are also frequently colored due to the absorption of light by electrons in d-orbitals. Additionally, they often have multiple oxidation states due to the availability of multiple d-orbitals for electrons to be gained or lost from.
To know more about transition metals visit:
https://brainly.com/question/29477193
#SPJ11
Related Questions
Action of heat on Zn²+, Pb²+, Fe³+ and hydrated salt
Answers
Answer:
Zinc ions (Zn²+) do not decompose when heated, but hydrated zinc salts can lose water (H2O) molecules when heated, forming anhydrous salts.
Lead ions (Pb²+) can decompose when a lot of heat is added, producing lead oxide (PbO) and oxygen (O2) gas.
Iron ions (Fe³+) can undergo different reactions depending on the conditions. FeCl₃ (hydrated iron (III) chloride), for example can decompose when heated to produce anhydrous FeCl₃ and water vapor. But if Fe(OH)₃ (hydrated iron(III) hydroxide), is heated strongly, it decomposes to form Fe₂O₃ (iron oxide) and water vapor.
The behavior of hydrated salts when heated can vary depending on the specific compound but generally, hydrated salts lose their water (H2O) molecules on heating and become anhydrous salts.
Sam was given the following equation to balance: H₂O → H₂ + O₂. She balanced it as follows: 2HO → H₂ + O₂. What did she do wrong? What is the correct way to balance the equation?
Answers
Answer:
2H2O = 2H2 + O2.Explanation:
2H2O = H2 + O2
this ain't balanced because the value of hydrogen are not the same.
Use the drop-down menus to classify each of the following compounds.
HR: H
HH
H-C-C-O-C-C-H
H-C-C-
-C-C-H
A
H
RETRY
>
-H
>
HH Br
H-C-C-C-H
Answers
Answer:
ester, ether, haloalkane
Explanation:
EDG.2022
What is Decomposition Reaction
Answers
Answer:
Explanation:
Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.
The decomposition reaction can be represented by the general equation:
AB → A + B
Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.
There are different types of decomposition reactions, including:
Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):
CaCO3 → CaO + CO2
Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):
2H2O → 2H2 + O2
Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:
Cl2 → 2Cl
These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.
Answer:
Explanation:
reaction in which a compound breaks down into simpler substances or elements
What is the number of moles in 4.55x10^23 molecules
of NH₂?
Answers
Answer: 0.756 moles
Explanation:
1 mole of NH2 has 6.022 x 10^23 molecules therefore:
(4.55x10^23)/(6.022x10^23)= 0.7555 moles or 0.756 using sig
Which of these statements best describes the relationship between matter, pure substances, and mixtures?
Pure substances can be divided into two groups: matter and mixtures.
Matter can be divided into two groups: pure substances and mixtures.
Mixtures and matter are two of many different types of pure substances.
Pure substances and matter are two of many different types of mixtures.
Answers
The statement which best describes the relationship between matter, pure substances, and mixtures among the following is ''Matter can be divided into two groups: pure substances and mixtures.'' Hence, option (2) is correct
What is Pure substance ?A pure substance is a single kind of matter that cannot be separated into other kinds of matter by any physical means.
Matter can be divided into two groups that is, pure substances and mixtures.
Hence, option (2) is correct which best describes the relationship between matter, pure substances, and mixtures among the given statements.
Learn more about pure substances here ;
https://brainly.com/question/24462192
#SPJ1
a 208 g sample of sodium-24 decays to 13.0 g of sodium-24 within 60.0 hours. what is the half-life of this radioactive isotope?
Answers
Answer:
The half-life of sodium-24 is approximately 12.1 hours.
Explanation:
The half-life of a radioactive isotope is the amount of time it takes for half of a sample to decay. We can use the following equation to calculate the half-life:
N = N0 * (1/2)^(t/T)
where N is the final amount, N0 is the initial amount, t is the time elapsed, and T is the half-life.
In this case, we know that the initial amount (N0) is 208 g, the final amount (N) is 13.0 g, and the time elapsed (t) is 60.0 hours. We can solve for the half-life (T) by rearranging the equation as follows:
T = t / log2(N0/N)
T = 60.0 hours / log2(208 g / 13.0 g)
T = 60.0 hours / 4.97
T = 12.1 hours
Which is not a compound?
Answers
Answer:
water
Explanation:
Which of these compounds has an atom that does NOT obey the octet rule? A. KBr B. CO2 C. ClF3 D. ICl
Answers
The compound that does NOT obey the octet rule is option c) \(ClF_3\).
let's examine each option:
A. KBr: Potassium bromide has both potassium (K) and bromine (Br) atoms following the octet rule, as potassium loses one electron to form a +1 ion, and bromine gains one electron to form a -1 ion.
B. \(CO_2\): In carbon dioxide, the carbon atom is double-bonded to two oxygen atoms. Each oxygen has 6 valence electrons, and carbon has 4. By sharing 2 electrons with each oxygen, carbon achieves an octet, and so do the oxygen atoms.
C. \(ClF_3\): Chlorine trifluoride is the correct answer. In this compound, chlorine has 10 electrons around it - 3 from the bonds with the fluorine atoms and 2 lone pairs. This molecule has an expanded octet, meaning that the chlorine atom does NOT obey the octet rule.
D. ICl: Iodine monochloride has iodine (I) and chlorine (Cl) atoms forming a single covalent bond. Both atoms follow the octet rule in this compound, as they share a pair of electrons to complete their valence shells.
Therefore, the compound with an atom that does NOT obey the octet rule is \(ClF_3\).
Learn more about octet rule here:
https://brainly.com/question/865531
#SPJ11
what is the chemical formula for glucose?
Answers
The Chemical Formula for Glucose is C₆H₁₂O₆.
Glucose(C₆H₁₂O₆). is an organic molecule that is generally a monosaccharide. Glucose is simply called sugar and is highly abundant in nature. It should be noted that monosaccharides are a subcategory of Carbohydrates.
Glucose is generally prepared by plants through the process of photosynthesis by taking up water and Carbon-di-oxide. The stored form of glucose is termed differently depending upon the organism it is stored. In the case of plants, the stored form of glucose is starch or amylopectin whereas in animals it is called glycogen.
It also makes up the wall of plants which is referred to as cellulose, a polysaccharide of glucose.
It is an important source of energy for almost all organisms that are present on the earth.
To know more about monosaccharides, click below:
https://brainly.com/question/27976384
#SPJ1
Answer:
C6H12O6 is the chemical formula of glucose
Which of the following is NOT a true statement?
Two or more atoms held together with bonds make up a molecule..
O Pure Substances are made of only one type of atom.
O At least two types of atoms are required to make a compound.
Mixtures can be made of two elements, two compounds, or an element and a
compound.
Answers
Two or more atoms held together with bonds make up a molecule is not the true statement
Bonds arise from the electrostatic forces between positively charged atomic nuclei and negatively charged electrons and covalent bond is defined as a chemical bond that includes the sharing of electron pair between atoms and the pair of electrons are know as bonding pairs and the stable balance of attractive and repulsive forces between atoms
Know more about bonds
https://brainly.com/question/17614303
#SPJ1
Cosider the sequence 2;5;8
1. 1 prove that none of the terms of the sequence are perfect squares
Answers
3. Determine the pH of each of the following solutions. (Hint: See Sample Problem B.) a. 1.0 x 10-2 M HCI c. 1.0 x 10-MHI b. 1.0 x 10-3 M HNO3 d. 1.0 x 10-M HB
Answers
Answer:
a. pH = 2 b. pH = 3 c. pH = 1 d. Unanswerable
Explanation:
pH = -log[H+] OR pH = -log{H3O+]
and inversely
pOH = -log[OH-]
1. Determine what substance you are working with, (acid/base)
2. Determine whether or not that acid or base is strong or weak.
a. 1.0 x 10^-2M HCl
HCl is a strong acid, therefore it will dissociate completely into H+ and Cl- with all ions going to the H+, therefore, the concentration of HCl and concentration of H+ are going to be equal, meaning we simply take the negative logarithm of the concentration of HCl and that would equal pH
pH = -log[H+]
pH = -log(1.0x10^-2)
pH = 2
b. 1.0 x 10^-3M HNO3
HNO3 like part a, is a strong acid, therefore it would simply require you to take the negative logarithm of the concentration of the compound itself, to find its pH.
pH = -log[H+]
pH = -log(1.0 x 10^-3)
pH = 3
c. 1.0 x 10^-1M HI
Like the previous parts, HI is a strong acid
pH = -log[H+]
pH = -log(0.10)
pH = 1
d. HB isn't an element, nor is it a compound so that would be unanswerable.
Processed foods often contain large amounts of salt, but it is actually sodium (Na) that causes health concerns. If 6 g of salt (NaCl) should be an adult's daily maximum, what would the daily maximum of just sodium (Na) be? Give your answer in milligrams. (2 points)
Answers
The daily maximum of just sodium (Na) should be = 6000 mg
Calculation of adult daily salt consumptionThe adult's daily maximum intake of salt = 6g
The major element of salt that causes health concerns is sodium (Na).
Therefore the quantity of sodium consumed in milligrammes= 6×1000
= 6000 mg
Learn more about salts here:
https://brainly.com/question/20835655
#SPJ1
Calculate the standard potential, ∘, for this reaction from its equilibrium constant at 298 K. X(s)+Y3+(aq)↽−−⇀X3+(aq)+Y(s)=6.90×10−8 X ( s ) + Y 3 + ( aq ) ↽ − − ⇀ X 3 + ( aq ) + Y ( s ) K = 6.90 × 10 − 8
Answers
Answer: The standard potential is -0.141 V
Explanation:
To calculate the Gibbs free energy for given value of equilibrium constant we use the relation:
\(\Delta G=-RTlnK\)
where,
= standard Gibbs free energy = ?
R = Gas constant = 8.314 J/Kmol
T = temperature = 298 K
K = equilibrium constant =
Putting values in above equation, we get:
\(\Delta G=40853J\)
Also \(\Delta G=-nFE^0\)
where n = no of electrons gained or lost = 3
F = Faradays constant = 96500 C
\(E^0\) = standard potential = ?
\(40853=3\times 96500\times E^0\)
\(E^0=-0.141V\)
Thus the standard potential is -0.141 V
Can someone please help me? :(
D. Communication
Answers
Answer:
Cooperation
Explanation:
Those animals are understanding the needs of each other.
Which substance has the strongest attractive forces between its particles? salt sugar or wax, then explain, give evidence, and reasoning for fun.
Answers
In general, substances with strong attractive forces between their particles tend to have high melting and boiling points and are solids at room temperature.
Salt (sodium chloride) is a solid at room temperature and has a relatively high melting point of 801°C. This is due to the strong attractive forces between its ions (positively charged sodium ions and negatively charged chloride ions).
Sugar (sucrose) is also a solid at room temperature but has a much lower melting point of 186°C. This is because the attractive forces between the sugar molecules are not as strong as the forces between the ions in salt.
Wax is a soft solid at room temperature and has a relatively low melting point. The attractive forces between wax molecules are weaker than those in salt or sugar.
So, in terms of the strength of attractive forces between its particles, salt would be the strongest, followed by sugar and then wax.
2. a student beginning this experiment accidentally spilled some t-butyl alcohol on his hands and on the laboratory bench. describe any potential danger this situation might cause and state the proper method of cleaning up from the accident.
Answers
T-butyl alcohol is flammable and an irritant so spilling it on his hands and bench may cause a fire hazard and cause irritation to his hands or eyes.
A tertiary aliphatic alcohol called t-Butyl Alcohol (t-BuOH) is employed in cosmetics as a perfume carrier, alcohol denaturant, and solvent. In 32 different eye makeup, fragrance, and shaving preparation formulations, t-BuOH was listed as an ingredient with amounts between 0.00001% and 0.3%. The acute oral LD(50) in rats was 3.0 to 3.7 g/kg, demonstrating the low acute oral toxicity in animals. Although weight loss was observed and microscopic damage to the liver and kidney, as well as alterations like centrilobular necrosis, vacuolation in hepatocytes, and loss of hepatic architecture, were noted in short-term oral studies in rats, t-BuOH at 2% (w/v) or less in drinking water did not cause gross organ or tissue damage in mice.
Learn more about T-butyl alcohol here:
https://brainly.com/question/14267353
#SPJ4
in an aerosol spray can with a volume of 456 ml contains is 3.18g of propane gas as a propellant If the can is at 23° C and 50 ATM what volume will be the propane occupy at STP
Answers
Answer: Answer:
21.03L
Explanation:
V1 = 456mL = 0.456L
T1 = 23°C = (23 + 273.15)K = 296.15K
P1 = 50atm
V2 = ?
T2 = 273.15K
P2 = 1.0atm
Note : P2 and T2 are at STP which are 1.0atm and 273.15K
To find V2, we have to use the combined gas equation,
(P1 × V1) / T1 = (P2 × V2) / T2
P1 × V1 × T2 = P2 × V2 × T1
V2 = (P1 × V1 × T2) / (P2 × T1)
V2 = (50 × 0.456 × 273.15) / (1.0 × 296.15)
V2 = 6227.82 / 296.15
V2 = 21.029L
Final volume of the gas is 21.03L
Explanation:
Why are subscripts used in an ionic bond?
Answers
Ca(OH)2 + Na2CO3 --> CaCO3 + NaOH
Answers
Answer:
caco3+Na2OH
Explanation:
to balance
why is the methyl red test read immediately after addition of methyl red reagent and the voges-proskauer read up to 60 minutes after addition of vp reagents a and b?
Answers
The reason why the methyl red test is read immediately after the addition of the methyl red reagent, while the Voges-Proskauer test is read up to 60 minutes after the addition of VP reagents A and B, is due to the differences in the chemical reactions taking place in each test.
- If the pH is less than 4.4, it indicates that the organism produces stable acids as a byproduct of glucose fermentation, and the test is considered positive.The color change occurs immediately, so the test can be read right after the addition of the reagent.
- The Voges-Proskauer test is used to detect the production of acetoin, a precursor of 2,3-butanediol, by organisms during glucose metabolism.VP reagents A and B are added to the test tube after incubation. These reagents react with acetoin to produce a red color.
To know more aboutt that methyl visit:
https://brainly.com/question/31490464
#SPJ11
why would 1 3 cyclohexadiene undergo dehydrogenation readily?
a. It is easily reduced. b. Hydrogen is a small molecule. c. 1, 3-Cyclohexadiene has no resonance energy. d. It would gain considerable stability by becoming benzene. e. It would not undergo dehydrogenation.
Answers
The correct answer is d. 1,3-cyclohexadiene undergoes dehydrogenation readily because it would gain considerable stability by becoming benzene. Benzene is a highly stable and aromatic compound that possesses resonance energy due to its delocalized pi-electrons.
Dehydrogenation is a chemical reaction that involves the removal of hydrogen from a molecule. In the case of 1,3-cyclohexadiene, the removal of two hydrogen atoms would result in the formation of benzene. This transformation would result in the formation of a highly stable compound, which has much lower energy than its precursor.
Moreover, 1,3-cyclohexadiene is an unsaturated compound that possesses a double bond between two carbon atoms. This double bond makes the molecule reactive towards dehydrogenation. During dehydrogenation, the double bond is broken, and the two hydrogen atoms that were attached to the carbon atoms are removed. As a result, the molecule undergoes a structural change, and a highly stable compound, benzene, is formed.
In conclusion, 1,3-cyclohexadiene undergoes dehydrogenation readily because it would gain considerable stability by becoming benzene. This transformation is a result of the removal of two hydrogen atoms from the molecule, and it occurs due to the reactivity of the double bond that the molecule possesses.
To know more about dehydrogenation visit:
https://brainly.com/question/23186275
#SPJ11
True or false? The scientific process is linear and always follows the same sequence of steps in the same order.
A) true
B) false
Answers
Answer:
True
Explanation:
If you were to change up the order the answer may be incorrect
The scientific process is linear and most commonly follows the same sequence of steps in the same order. However, it need to follow all the steps for all scientific process. Hence, the statement is false.
What is a scientific process ?A scientific process is a well designed approach to investigate or analyze the problem and to test a relevant hypothesis. The steps included in the scientific process starts from a scientific question.
The question then generates a hypothesis based on the observations and standard data. The testing is conducted with well designed experiment with all practical tools available.
The experimental results are thoroughly evaluated and the reaches with a conclusion. The results are communicated through various journals. This is the general way of a scientific process. But not every scientific strictly need to follow this. Hence, the statement is false.
Find more on scientific process:
https://brainly.com/question/1347425
#SPJ6
Green light has a frequency of 6.01 x 1024 Hz. What is the wavelength?
Answers
Answer:
λ= 4.99 * 10^-17
Explanation:
C= F * λ
F= frequency(Hz)
λ= wavelength(m)
C= 3.0 * 10^8
F= 6.01 * 10^24
λ= ?
3.0 * 10^8= (6.01 * 10^24) λ
***Simplify
λ= 4.99 * 10^-17
the nitrogen bases are held together in the center of the molecule by
Answers
In the DNA ,the nitrogen bases are held together in the center of the molecule by the hydrogen bond.
The nitrogen bases are held together in the center of the DNA molecule by the hydrogen bond. The hydrogen bond that is the H - bond binds the nitrogen bases in between the two strands of the DNA. There are the two hydrogen bonds that is present in between the A and the T and the three hydrogen bond in between the G and the C.
The hydrogen bond in the DNA held together the nitrogen bases in the center of the molecule.
This question is incomplete, the complete question is :
In the DNA ,the nitrogen bases are held together in the center of the molecule by ?
To learn more about DNA here
https://brainly.com/question/11871151
#SPJ4
Which one of the following is not a correct formation reaction? (products are correct)
A) H2(g) + O(g) → H2O(l)
B) H2(g) + Cl2(g) → HCl(g)
C) 6C(graphite) + 3H2(g) → C6H6(l)
D) C(graphite) → C(diamond)
E) 6C(graphite) + 6H2(g) + 3O2(g) → C6H12O6(s)
Answers
Option E is not the correct formation reaction.
What are formation reactions?The correct formation reactions should show the formation of one mole of a compound from its elements in their standard state at a pressure of 1 bar and a temperature of 298 K. The reaction should be balanced and have the correct products.
A) The formation of water from hydrogen and oxygen is a correct formation reaction.
B) The formation of hydrogen chloride from hydrogen and chlorine is a correct formation reaction.
C) The formation of benzene from carbon and hydrogen is a correct formation reaction.
D) The conversion of graphite to diamond is not a correct formation reaction, as it is a transformation process and not a formation of a compound.
E) The formation of glucose from carbon, hydrogen, and oxygen is not a correct formation reaction. The balanced equation for the formation of glucose from its elements would be:
6CO2(g) + 6H2(g) → C6H12O6(s)
Therefore, the correct answer is E.
Learn more about formation reactions
brainly.com/question/28753007
#SPJ11
A high speed train travels 176 miles in 7 hours. What is the speed of the train
in mph? Enter your answer a just a number without units.
Answers
Answer:
25 mph
Explanation:
So we have to find the unit rate, or you could use the DTS triangle, but both say you have to divide, so our equation is:
176 ÷ 7 = 25.14
But I'm going to round that
So the train is traveling at 25 mph
hope this helps:/
How would the concentration of silver ions compare in a 1.0 x 10-16 L saturated solution to a 1.5 x 10-16 L saturated solution?
Answers
A 4.80g piece of magnesium displaces 2.76 mL of water when it is placed in a graduated cylinder. What is the density of magnesium?
Answers
Answer:
6
What do AIA, SAG, AFP and AMA all stand for? Select four options.
American Institute of Architects
American Society of Mechanical Engineers
American Medical Association
Screen Actors Guild
Association for Finance Professionals
Professional Colleges