Answer: The transition elements are in the d-block, and in the d-orbital have valence electrons. They can form several states of oxidation and contain different ions. Inner transition elements are in the f-block, and in the f-orbital have valence electrons.
Explanation:
Transition metals are elements that have partially filled the d-orbital while in f-block elements the electron is filled in the f-orbital.
What are transition metals and f- block elements?Transition elements or transition metals are elements that have partially filled d-orbitals. An element that has the ability to produce cations with an incompletely filled d-orbital or an element having a d-subshell that is incompletely filled with electrons.
Any element which belongs to the d-block of the modern periodic table or is present in group 3 to 12 is considered to be a transition metal.
The f-block elements are those in which the f-orbital gets filled up by electrons. The f-block elements have electrons 1 to 14 in their f-orbital, and 0 to 1 in their d-orbital.
The f-block element is classified into two series one lanthanides and other actinides corresponding to the filling of electrons in 4f and 5f orbitals respectively. The f- block elements are placed at the bottom of the modern periodic table.
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Explain why this crossing could result in white hedgehogs even though brown is dominant
Answer:
Because The white gene is the recessive gene and the brown gene is the dominant gene hence all the offspring being brown instead of white :)
Explanation:
Thank me later!
chemistry semester 2
Which item isn't a resource?
food
shelter
temperature
available mates
Answer:
temperature
Explanation:
hope this helps
10 g of a radioactive substance was placed in an air tight container 50 years ago. When the container was opened, only 2.5 g remains. What was the half life of this material?
Answer:
25 years.
Explanation:
From the question given above, the following data were obtained:
Original amount (N₀) = 10 g
Time (t) = 50 years
Amount remaining (N) = 2.5 g
Half-life (t½) =?
Next, we shall determine the number of half-lives that has elapse. This can be obtained as follow:
Original amount (N₀) = 10 g
Amount remaining (N) = 2.5 g
Number of half-lives (n) =?
N = 1/2ⁿ × N₀
2.5 = 1/2ⁿ × 10
Cross multiply
2.5 × 2ⁿ = 10
Divide both side by 2.5
2ⁿ = 10 / 2.5
2ⁿ = 4
Express 4 in index form with 2 as the base.
2ⁿ = 2²
n =2
Thus, 2 half-lives has elapsed.
Finally, we shall determine the half-life of the radioactive substance. This can be obtained as follow:
Time (t) = 50 years
Number of half-lives (n) = 2
Half-life (t½) =?
n = t / t½
2 = 50 / t½
Cross multiply
2 × t½ = 50
Divide both side by 2
t½ = 50 / 2
t½ = 25 years.
Thus, the half-life of the radioactive substance is 25 years.
35 points plz be fr will mark brainliest
Answer:
6. solar eclipsis
7. drive less fuel efficient vehicles
Explanation:
these are the only questions i get but i still hope this helps :)
show the formation of oxygen molecule
Answer: H2o
Explanation:
because oxygen is in the air
what was the name of yesterday's supermoon
Answer: May's full moon or Flower moon
Explanation:
1. Write a balanced chemical equation, including physical state symbols, for the combustion of liquid dodecane into gaseous carbon dioxide and gaseous water.
2. Suppose 0.22 kg of dodecane are burned in air at a pressure of exactly and a temperature of 17.0°C. Calculate the volume of carbon dioxide gas that is produced. Round your answer to significant digits.
Answer: [tex]2C_{12}H_{26}(l)+37O_2(g)\rightarrow 24CO_2(g)+26H_2O(g)[/tex]
2. 369 L
Explanation:
1. Combustion is a chemical reaction in which hydrocarbons are burnt in the presence of oxygen to give carbon dioxide and water.
The balanced chemical reaction is:
[tex]2C_{12}H_{26}(l)+37O_2(g)\rightarrow 24CO_2(g)+26H_2O(g)[/tex]
2. To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{220g}{170.3g/mol}=1.29moles[/tex]
According to stoichiometry :
2 mole of dodecane produces = 24 moles of carbon dioxide
Thus 1.29 moles of dodecane produces = [tex]\frac{24}{2}\times 1.29=15.5 moles[/tex] of carbon dioxide
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 1 atm
V = Volume of gas = ?
n = number of moles = 15.5
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]17^0C=(17+273)K=290K[/tex]
[tex]V=\frac{nRT}{P}[/tex]
[tex]V=\frac{15.5\times 0.0821L atm/K mol\times 290K}{1atm}=369L[/tex]
Thus the volume of carbon dioxide gas that is produced is 369 L
Why might calcium also be called the calcium of citric acid
Calcium also be called the calcium of citric acid because calcium citrate malate contains the calcium salt of citric acid and malic acid.
What is citric acid?Citric acid is an organic compound with a chemical formula [tex]HOC(CO_2H)[/tex].
Calcium citrate malate is a water-soluble calcium supplement. It is the calcium salt of citric acid and malic acid with variable composition.
Hence, calcium is also called the calcium of citric acid.
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True or false water molecules are polymers
6 The final process in the formation of sedimentary rock is - A. cementation B. melting C.cooling
Answer:
A. cementation
Explanation:
( it deleted my answer)
what statement best explains how life functions a unicellular organism are carried out?
Answer:
C). The structures in the cell work together to perform its life functions.
Explanation:
Unicellular organisms are characterized as organisms that are able to perform all the life functions through a single-cell. The third statement correctly elaborates how 'single-celled organisms carry out these life functions by cooperatively employing the structures lying inside the cell.' The first option is incorrect as it talks about multi-cells which doesn't even exist in unicellular organisms. While the second option is wrong because there are no tissues formed of single-cell. The last option is incorrect as the specialized cells perform different life functions in multi-cellular organisms. Thus, option C is the correct answer.
Answer:
The structures in the cell work together to perform its lifefunctions.
Explanation:
What is the maximum number of covalent
bonds that a carbon atom can form?
A. 1
B. 2
C. 3
D. 4
Answer:
D. 4
Explanation:
Answer and Explanation: Carbon can form a maximum of four covalent bonds. Carbon can share up to four pairs of electrons, therefore, the carbon atom fills its outer energy level and achieves chemical stability.
Help please thank you
Answer:
It’s probably plants seed and raise crops for their food
Explanation:
Answer:
I would say b
Explanation:
A hunter would go out to hunt and gathers handle crops or find crops so b.
DOES ANYONE KNOW THESE?? :(
Answer and Explanation:
9. Gas particles are always in constant and C. Random motion.
10. In a sample of a gas, most of the volume is B. Empty Space.
11. Which state of matter has constant shape and volume?
A. Solid
12. A solid is a state of matter that has a B. Definite Volume and Definite Shape.
13. In which state of matter are particles packed together in fixed positions?
B. Solid
#teamtrees #PAW (Plant And Water)
what is conductor?
give two examples.
Answer:
Conductor is any material tht allows he flow of electrons or electric current . Ex: Metals like iron and copper.
Hope im right!!
Answer:-
Examples of conductors include metals, aqueous solutions of salts (i.e., ionic compounds dissolved in water), graphite, and the human body. Examples of insulators include plastics, Styrofoam, paper, rubber, glass and dry air.Aldehydes and ketones are converted into alkenes by means of a direct nucleophilic addition called the Wittig reaction.
a. True
b. False
Answer:
The given statement- Aldehydes and ketones are converted into alkenes by means of a direct nucleophilic addition called the Wittig reaction, is True.
Explanation:
The Wittig reaction converts aldehydes and ketones into alkenes through a simple nucleophilic addition. A triphenylphosphorine ylide, also known as a phosphorane, reacts with an aldehyde/ketone to produce an oxaphosphetane, a four-membered cyclic intermediate. Instead of being isolated, the oxaphosphetane decomposes spontaneously to release triphenylphosphine oxide and an alkene.
In an SN2 reaction, triphenylphosphine, a good nucleophile, reacts with a primary alkyl halide, followed by deprotonation of the carbon with a solid base, such as butyllithium, to form the ylide. In the product alkene, the carbonyl carbon and the carbon initially bound to the halogen become two carbons with a double bond.
The Wittig reaction's true worth lies in its ability to produce an alkene with a predictable structure, as the C=C bond forms exactly where the C=O bond did in the reactant, with no isomers (other than E/Z isomers) forming.
Hence , the correct option is (A) True.
Why is it that the higher the molecular mass of the alkane, the higher the boiling point? Refer to intermolecuar forces and energy.
Answer:
Higher melting and boiling points signify stronger noncovalent intermolecular forces. Consider the boiling points of increasingly larger hydrocarbons. More carbons means a greater surface area possible for hydrophobic interaction, and thus higher boiling points.
sea stars have radial symmetry .what does this mean?
Answer: Echinoderms usually have five appendages (arms or rays), but there are some exceptions. Radial symmetry means that the body is a hub, like a bicycle wheel, and tentacles are spokes coming out of it (think of a starfish).
Explanation:
Answer:
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Explanation:
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g Imagine that you found a piece of carved wood that has been embedded in glacial ice. The mass of the wood is 50 grams, and 30% of the mass is carbon. The 14C/12C ratio of the wood was measured by mass spectrometry, and found to be 20 % of the 14C/12C ratio found in CO2 in modern air. You may assume that the half life of 14C is 5700 years. Which is the best estimate of the age of the wood
Answer:
13414 years
Explanation:
From;
0.693/ t1/2 = 2.303/t log No/N
t1/2 = half life of C-14
t = age of the sample
No= initial amount of C-14
N = present amount of C-14
From the question, N = 0.2 No
Hence;
0.693/5700 = 2.303/t log No/0.2No
1.2 * 10^-4 = 2.303/t log 1/0.2
1.2 * 10^-4 = 1.6097/t
t = 1.6097/1.2 * 10^-4
t = 13414 years
if you understand please help me x
Answer:
1. Percentage yield is 64.75%
2. Atom economy is 48.39%
Explanation:
1. Determination of the percentage yield
Experimental yield = 24.8 g
Theoretical yield = 38.3 g
Percentage yield =?
Percentage yield = Experimental yield /Theoretical yield × 100
Percentage yield = 24.8 / 38.3 × Percentage yield = 2480 / 38.3
Percentage yield = 64.75%
2. Determination of the atom economy.
The balanced equation for the reaction is given below:
6CO₂ + 6H₂O —> C₆H₁₂O₆ + 6O₂
Next, we shall determine the mass of CO₂, H₂O and C₆H₁₂O₆ from the balanced equation.
Molar mass of CO₂ = 12 + (16×2)
= 12 + 32
= 44 g/mol
Mass of CO₂ from the balanced equation = 6 × 44 = 264 g
Molar mass of H₂O = (2×1) + 16
= 2 + 16
= 18 g/mol
Mass of H₂O from balanced equation = 6 × 18 = 108 g
Molar mass of C₆H₁₂O₆ = (6×12) + (12×1) + (6×16)
= 72 + 12 + 96
= 180 g/mol
Mass of C₆H₁₂O₆ from the balanced equation = 1 × 180 = 180 g
Next, we shall determine the total mass of the reactants. This is illustrated below:
Mass of CO₂ = 264 g
Mass of H₂O = 108 g
Total mass of reactants =?
Total mass of reactant = Mass of CO₂ + Mass of H₂O
Total mass of reactant = 264 + 108
Total mass of reactant = 372 g
Finally, we shall determine the atom economy. This can be obtained as follow:
Mass of desire atom (C₆H₁₂O₆) = 180 g
Total mass of reactants = 372 g
Atom economy =.?
Atom economy = mass of desire atom / total mass of reactant × 100
Atom economy = 180/372 × 100
Atom economy = 48.39%
Determine the amino acid sequence of a polypeptide from the following data:
Complete hydrolysis of the peptide yields Arg, 2 Gly, Ile, 3 Leu, 2 Lys, 2 Met, 2 Phe, Pro, Ser, 2 Tyr, and Val. Treatment with Edman's reagent releases PTH-Gly.
Carboxypeptidase A releases Phe.
Treatment with cyanogen bromide yields the following three peptides:
1. Gly-Leu-Tyr-Phe-Lys-Ser-Met
2. Gly-Leu-Tyr-Lys-Val-Ile-Arg-Met
3. Leu-Pro-Phe
Treatment with trypsin yields the following four peptides:
1. Gly-Leu-Tyr-Phe-Lys
2. Ser-Met-Gly-Leu-Tyr-Lys
3. Val-Ile-Arg 4. Met-Leu-Pro-Phe
Solution :
1. It is given that when Edman's reagent is used, it releases PTH-Glycin. The degradation of Edmans is used for the amino acids to sequencing of the peptide/protein and is also removes N terminal amino acid and thus gives us the PTH amino acid product.
Therefore, the first amino acid is Glycine.
2. The Carboxypeptidase A releases the C terminal amino acid, and therefore the last amino acid is Phe.
3. The Cyanogen Bromide helps to chop after the Med residue, therefore the sequence is 1 - 2 - 3 or 2 - 1 - 3.
4. The trysin chops after the basic amino acid - Arg and the Lys unless followed by Proline and so the sequence of the peptide is 1 - 2 - 3 4.
How does a duckling become a bigger and stronger adult duck?
A. Body repair
B. Warmth
C. Growth
D. Motion
Answer:The correct answer is C.
Explanation: I had it on a quiz
Answer: the answer is C growth
Explanation: body repair, motion and warmth are not the answer the reason why is because body repair is when the body repairs it’s self if it’s hurt and motion is when animals use the energy from the food they eat to move and warmth helps animals to get warm so they don’t get to cold so the answer would be growth .
A sample of hydrogen gas occupies
1.0 L at 760 torr in a balloon. If the
temperature is kept constant, which
expression represents the volume of
hydrogen gas in liters when the
pressure is raised to 860 torr?
A 860 + 760
B 860 – 760
C 860 / 760
D 760 / 860
When the pressure of a sample of hydrogen gas increases from 760 torr to 860 torr, the expression D 760 / 860 represents the volume of hydrogen gas in liters.
What does Boyle's law state?Boyle's law is a law stating that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature.
A sample of hydrogen gas occupies 1.0 L at 760 torr in a balloon. We can calculate the volume when the pressure is increased to 860 torr using Boyle's law.
P₁ × V₁ = P₂ × V₂
V₂ = (P₁/P₂) × V₁
V₂ = (760 torr/860 torr) × 1.0 L = 0.88 L
where,
P₁ and V₁ are the initial pressure and volume.P₂ and V₂ are the final pressure and volume.When the pressure of a sample of hydrogen gas increases from 760 torr to 860 torr, the expression D 760 / 860 represents the volume of hydrogen gas in liters.
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What is the solubility of 80 grams of magnesium chloride (MgCl2) dissolved into 150 cm3 of water?
A. 533.33g/dm3
B. 12g/dm3
C. 12000g/dm3
D. 1.88g/dm3
Answer:
A
Explanation:
Antacids are used to treat acid reflux by neutralizing stomach acid, which is hydrochloric acid. Calcium carbonate, sodium bicarbonate and aluminum hydroxide are common main ingredients found in various brands of antacids. The brand Tums has calcium carbonate as the main ingredient to neutralize stomach acid. Write a balanced equation to show how Tums will neutralize stomach acid, and answer the following questions based on this reaction.
Answer: [tex]CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2[/tex]
Explanation:
Neutralization is a chemical reaction in which acid and base combine to form salt and water. Acids donate[tex]H^+[/tex] and bases donate [tex]OH^-[/tex] in water which combine to form water molecules.
The chemical reaction between calcium carbonate and hydrochloric acid forms calcium chloride , water and carbon dioxide.
The balanced chemical equation is:
[tex]CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2[/tex]
Which of the following processes is endothermic?
Any combustion reaction
Bonds being made in the products
Bonds being broken in the reactants
Nitric oxide gas, NO(g), can be oxidized in air to
produce nitrogen dioxide gas, NO2(g):
2 NO(g) + O2(g) → 2 NO2(g)
Determine the enthalpy change for this reaction
using any of these thermochemical equations:
02(g) →20(g)
AH = +495 kJ
Hope this helps!!
Thank You!
What properties makes it possible for substances to be separated using crystallisation
I need help please
I got stuck and now confused
Answer: Triels, Tetrels, Pnictogens and Chalcogens
Explanation:
Between the Transition metals and the Halogens lies Groups 13, 14, 15 and 16.
Group 13 are also known as Triels and consist of elements like Boron and Aluminium.
Next up is Group 14 also known as the Tetrals and they consist of elements like Carbon, Silicon and Tin.
The Group 15 elements are known as Phictogens and consist of Nitrogen, Phosphorus and Arsenic.
Finally we have the Chalcogens or Group 16 elements such as oxygen, Sulfur and Selenium.