Answers
Answer:
Blue- I took the test
Explanation:
Related Questions
Explain why an element with a large atomic radius won't have a high electronegativity
Answers
Explanation:
The larger the radius of an atom, the lesser the electronegativity of the atom. This is because of the screening effect.
Electronegativity of an element is a property that combines the ability of its atom to lose or gain electron. It is mostly expressed as the measure of the relative tendency with which the atoms of the element attract valence electrons in a chemical bond. The larger an atom, the lesser the nuclear charge on the outermost electrons. This weak shielding of these outer shell electrons results in them easily being lost.How long did it take a bike to travel 20 miles in 12.5 mph?
Answers
Answer:
2 hours and 4 mins
The diagram shows different forms of thermal energy transfer.
Which process is making the pot's handle hot?
Answers
Answer:
Conduction
Explanation:
The handle is touching the pot.
And I got it wrong
__________ are composed of two or more covalently bonded atoms.
a). elements
b)molecules
Answers
Write a chemical equation representing the second ionization energy for lithium. Use e− as the symbol for an electron.
Answers
Answer: Li^+ (g) ----> Li^2+ (g) + e^-
Considering the definition of first and second ionization energy, the second ionization energy of lithium is:
Li⁺ → Li²⁺ + 1 e-
In first place, the electrons are attracted to the nucleus and it is necessary to provide energy to start them. Ionization energy is the energy required to remove an electron from a gaseous atom, isolated and in a ground state. The electrons in the last shell, which are the weakest attracted to the nucleus, are always lost. In this way the neutral atom becomes a gaseous cation (ion with a positive charge).
So, in this case, the first ionization energy of lithium is:
Li → Li⁺ + 1 e-
The energy required to remove a second electron is called the second ionization energy and due to the difficulty of removing an electron from a positive particle, its value is greater than the first ionization energy (the volume of a positive ion is less than that of the neutral atom and the electrostatic force is greater in the positive ion than in the atom)
Finally, in this case, the second ionization energy of lithium is:
Li⁺ → Li²⁺ + 1 e-
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How could you draw a model of the element copper to show that it is different from the element gold?
please help me hope you understand helllllllpppppppppppppppppp meeeeeeeeee
Answers
use the periodic table the atomic number of copper is 29 so neutral copper atoms have 29 protons and 29 electrons to estimate the number of neutrons in the atom round the atomic mass to 64 and subtract the atomic number the atomic number is the number of protons. do the same thing for gold and u have your atomic models for each.
What is the importance of gametes?
A. They help to produce proteins for the cell.
B. They are created when a cell splits into two copies of itself.
C. They engage in binary fission.
D. They allow eukaryotes to reproduce.
Answers
Answer:
[tex]\boxed {\boxed {\sf D. \ They \ allow \ eukaryotes \ to \ reproduce}}[/tex]
Explanation:
Gametes are also called sex cells.
There are two types: the sperm (male) and egg (female). Gametes are haploid or contain half of the genetic information. When they unite and fertilize, they combine the two halves of the genome to create a diploid zygote that has one complete set of genetic information.
This process is known as sexual reproduction, the type of reproduction that eukaryotes (organism with cells containing a nucleus with DNA and membrane bound organelles) typically use.
So, based on the information we know above, the best answer choice is D. They allow eukaryotes to reproduce
If the abundance of 85 Rb is 72.2% and the abundance of 87 Rb is 27.8%, what is the average atomic mass of rubidium?
Answers
The average atomic mass of Rubidium : 85.556 u
Further explanationIsotopes are atoms that have the same atomic number but different mass numbers
Each isotope has an abundance which is usually expressed as a percentage
The average relative mass of atoms is obtained by adding the product of the percentage and mass of each isotope
Can be formulated:
[tex]\tt Average~Mass~atom~X=mass~isotope~ 1\times \%1+mass~isotope~2\times \%2+..[/tex]
The abundance of 85 Rb is 72.2% and the abundance of 87 Rb is 27.8%, so
mass isotope 1=85, %abundance=72.2
mass isotope 2=87, %abundance=27.8
The averages atomic mass of Rubidium :
[tex]\tt average~atomic~mass=85\times 0.722+87\times 0.278\\\\average~atomic~mass=61.37+24.186\\\\average~atomic~mass=\boxed{\bold{85.556~u}}[/tex]
0.415 g of an unknown triprotic acid are used to make a 100.00 mL solution. Then 25.00 mL of this solution is transferred to an Erlenmeyer flask and is titrated with 0.1029 M NaOH. The initial burette reading is 1.81 mL; when the titration endpoint is reached, the final burette reading is 39.70 mL. How many moles of triprotic acid are neutralized during the titration? Provide your answer in decimal form (e.g. 0.123) to the correct number of significant figures.
Answers
Answer:
Explanation:
Initial burette reading = 1.81 mL
final burette reading = 39.7 mL
volume of NaOH used = 39.7 - 1.81 = 37.89 mL .
37.89 mL of .1029 M NaOH is used to neutralise triprotic acid
No of moles contained by 37.89 mL of .1029 M NaOH
= .03789 x .1029 moles
= 3.89 x 10⁻³ moles
Since acid is triprotic , its equivalent weight = molecular weight / 3
No of moles of triprotic acid = 3.89 x 10⁻³ / 3
= 1.30 x 10⁻³ moles .
PLZZZ HURRY
Stuart designed and built a water filter in class. He wants to know if it will make water from lakes or streams safe to drink. Which of
the following would it be best for Stuart to measure in an experiment in order to test his design and answer this question?
А. the amount of time required for different volumes of water to pass through his filter
В. the diameter of the largest grain of dust, dirt, or sand that can pass through his filter
C. the amount of bacteria and impurities in water both before and after it passes through his filter
D. the maximum force that can be applied to his filter without breaking it
Answers
Answer:
c or d
Explanation:
C! The amount of bacteria and impurities in water both before and after it passes through his filter!
Explanation:
Although each of these properties of Stuart's filter may be worth testing, the one that will tell him whether his filter can make lake water safe to drink is the amount of bacteria, parasites, and impurities in water both before and after it passes through his filter. Some filters are good at removing impurities, but not bacteria. Other ways of purifying water may kill bacteria but not remove impurities.
What is the main difference between vascular and nonvascular plants? the ability or inability to perform photosynthesis the presence or absence of xylem and phloem the ability or inability to perform cellular respiration the presence or absence of water
Answers
Answer:
Vascular plants are plants found on land that have lignified tissues for conducting water and minerals throughout the body of the plant. Non-vascular plants are plants mostly found in damp and moist areas and lack specialized vascular tissues. Vascular plants are also known as tracheophytes.
Explanation:
Answer:
The correct answer is B. The presence or absence of xylem and phloem.
Explanation:
I did this quiz. :)
In what order do electrons fill orbitals?
A. Before pairing, 1 electron occupies each s and p orbital.
B. Electrons fill orbitals in order of increasing orbital energy.
C. Orbitals s, p, and then d fill in one energy level before starting the
next level.
D. The p orbitals fill before the s orbitals in an energy level.
SUBM
Answers
Answer:B electrons fill orbitals In order of their increasing energy from left to right
Explanation:
c. When 4.46 moles of ethylene, C2H4, burns in oxygen to give carbon dioxide and
water, how many grams of carbon dioxide are formed?
C₂H4 + 30₂
-
2 H2O + 2 CO2
Answers
Answer:
finding believability
The elaboration likelihood model emphasizes the use of __________ persuasion and __________ persuasion methods. A. direct . . . elaborative B. peripheral . . . elaborative C. direct . . . peripheral D. indirect . . . direct Please select the best answer from the choices provided A B C D
Answers
Answer:
It's C, direct and peripheral.
Explanation:
Just took the test
The elaboration likelihood model emphasizes the use of direct persuasion
and peripheral persuasion methods.
This theory involves a dual process which explains how attitudes are
changed in individuals through persuasion. The two methods of persuasion
include:
Direct persuasionPeripheral persuasionThese methods help in the formation of attitude which makes option C the
most appropriate choice.
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Please help! sacrificing my points for this...
which process directly results of this picture?
A.Water erosion
B. Water deposition
C. Wind erosion
D.Wind Deposition.
Answers
Answer:
I think it's B
Explanation:
Well I'm pretty sure it's not C or D. And A is detachment or removal of soil by water, And the picture doesn't look like that. So the only explanation is B
Answer:
I go for B.
Explanation:
Is tissue a element or compound
Answers
Answer:
compound
Explanation:
true or false The atoms in Container A are hydrogen atoms. Hydrogen is a gas. The atoms placed in containers E, F, G, and H will fill the same volume as the volume of Container A.
Answers
Answer:
False
Explanation:
Calculate the mass percent composition of carbon
in
C3H4
Answers
Answer: 90%
Explanation:
So we need to find the molar mass of the entire compound, and the mass of carbon times the number of molecules:
Molar mass: 3*12 + 4*1 = 40
Mass of carbon: 12*3 = 36
36/40 * 100 = 9/10 * 100 = 90%
An analytical chemist weighs out 0.281g of an unknown diprotic acid into a 250mL volumetric flask and dilutes to the mark with distilled water. He then titrates this solution with 0.0700M NaOH solution. When the titration reaches the equivalence point, the chemist finds he has added 48.3mL of NaOH solution. Calculate the molar mass of the unknown acid.
Answers
Answer:
166 g/mol
Explanation:
Step 1: Write the neutralization reaction
H₂A + 2 NaOH ⇒ Na₂A + 2 H₂O
Step 2: Calculate the reacting moles of NaOH
48.3 mL of 0.0700 M NaOH react.
0.0483 L × 0.0700 mol/L = 3.38 × 10⁻³ mol
Step 3: Calculate the reacting moles of H₂A
The molar ratio of H₂A to NaOH is 1:2. The reacting moles of H₂A are 1/2 × 3.38 × 10⁻³ mol = 1.69 × 10⁻³ mol.
Step 4: Calculate the molar mass of H₂A
1.69 × 10⁻³ moles of H₂A have a mass of 0.281 g. The molar mass of H₂A is:
M = 0.281 g / 1.69 × 10⁻³ mol = 166 g/mol
The IR spectrum of a solid can be taken by dissolving it to create a solution. An appropriate solvent is ________because its IR stretches are _______
Answers
Answer:
An appropriate solvent is carbon tetrachloride [tex](CCl_{4} )[/tex] because its IR stretches are not visible in the infrared region.
Explanation:
Non-polar solvents don not show peaks at the IR frequency region because they do not have dipoles which would absorb the infrared light. This makes them suitable solvents in IR Spectroscopy.
Therefore non-polar solvents such as CCl4 or Carbon disulfide are appropriate for the IR spectrum. They also do not interfere with the halide disks used in the spectrometer, as a solvent like water would.
Let me know if you need any other assistance.
How many helium atoms does water (H20) contain?
OA) O
B) 1
C) 2
OD) 3
Answers
Answer:
it's zero
Explanation:
water is composed of hydrogen and oxygen
Determine the mole ratio between N2 and NF3. Question is below..
Answers
Answer:
The mole ratio is --> 1: 2
5 moles of N2
Explanation:
The balanced equation shows us that for every mole of N2, 2 moles of NH3 will be produced.
This also means that in order for 10 moles of NH3 to be produced, 5 moles of N2 need to react
Answer:
The answer is given to you by as04621.
Explanation:
What type of energy drives the turbines that produce electricity from water?
Answers
Answer:
Wind energy
Explanation:
Answer: Wind energy
Explanation:
How many molecules are in 3 grams of NO2?
Answers
Answer:
0.06520959450500399
Explanation:
Answer:
46.0055
Explanation:
Consider a Galvanic cell constructed from the following half cells, linked by a KCl salt bridge: an Fe electrode in 1.0 M FeCl2 solution and a Sn electrode in 1.0 M Sn(NO3)2 solution When the cell is running spontaneously, which choice includes only true statements and no false ones?a) The iron electrode gains mass and the iron electrode is the cathode.b) The tin electrode gains mass and the tin electrode is the cathode.c) The iron electrode gains mass and the iron electrode is the anode.d) The iron electrode loses mass and the iron electrode is the cathode.e) The tin electrode loses mass and the tin electrode is the cathode.
Answers
Answer:
b) The tin electrode gains mass and the tin electrode is the cathode.
Explanation:
Iron(ii) ion, Fe⁺ is higher than tin(ii) ion, Sn²⁺ in the electrochemical series, therefore, tin (ii) iron is preferentially discharged to iron(ii) ion in aqueous solutions.
Also, since oxidation occurs at the anode and reduction occurs at the cathode, in the Galvanic cell constructed from the following half cells, linked by a KCl salt bridge: an Fe electrode in 1.0 M FeCl2 solution and a Sn electrode in 1.0 M Sn(NO3)2 solution, the Fe electrode serves as the anode, while the Sn electrode serves as the cathode.
The Sn²⁺ ions in the aqueous solution of Sn(NO₃)₂ will accept electrons from the Sn cathode and become deposited as neutral Sn atoms. At the anode, neutral Fe atoms will dissolve into the FeCl₂ solution depositing their electrons at the anode, thereby losing mass.
Therefore the correct option is: (b) The tin electrode gains mass and the tin electrode is the cathode.
Which of the following is soluble in water at 25 °C?
Fe(NO3)2
FeCO3
Fe(OH)2
Fes
Fe3(PO4)2
Answers
Answer:
Fe(NO3)2
Explanation:
Out of all the options, the compound that can be dissolved in water is Fe(NO₃)₃.
Fe(NO₃)₃ or Iron Nitrate is capable of being dissolved in water at 25°C. This is in line with its properties as a nitrate because most nitrates are soluble in water at room temperature.
Other properties and uses of Nitrates include:
Contain nitrogen and oxygen Useful in checking water quality Useful in fertilizerIn conclusion, Iron Nitrate is soluble in water at the room temperature of 25°C.
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Perform the following operation
and express the answer in
scientific notation.
5.0x10-5 +2.0x10-4
Answers
Answer:
[tex]2.5[/tex] × [tex]10^{-4}[/tex]
Explanation:
[tex]5+10^{-5} + 2[/tex] × [tex]10^{-4} = 0.5[/tex] × [tex]10^{-4} + 2[/tex] × [tex]10^{-4}[/tex]
[tex]0.5[/tex] × [tex]10^{-4} + 2[/tex] × [tex]10^{-4}[/tex] = [tex]2.5[/tex] × [tex]10^{-4}[/tex]
In the provided issue, the scientific notation-expressed integers 5.0x10-5 and 2.0x10-4 are added, and the solution is 2.5x10^-4.
Thus, first transform the smaller integer to have the same exponent as the larger number in order to complete the addition. In this situation, by shifting the decimal point one position to the right, we rewrite 5.0x10-5 as 0.5x10-4.
The outcome of adding the numbers together is 2.5. Finally, we use the common exponent—in this example, -4—to express the result in scientific notation. The final solution is 2.5x10^-4 as a result. Therefore, by adjusting the exponent and adding the numbers, the final solution, 2.5x10^-4 is obtained.
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True or False:
Carbon forms an incredible variety of substances
because it has eight valence electrons making it a
very stable atom that readily bonds.
Answers
Answer:
true i think but dont take my word for it.✌
According to the electronic configuration, carbon has 4 valence electrons that makes it a very stable atom that readily bonds.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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What is the oxidation state of P in PO43-?
O A. +8
O B. +3
O C. +5
OD. +2
Answers
Answer:
the answer is +5
Explanation:
good luck :)
Which of the following is an organ in the digestive system heart, stomach, intestinal tissue, lungs
Answers
Answer:
stomach
Explanation:
stomach
Answer:
Stomach
Explanation:
The heart and lungs aren't part of the digestive system and intestinal tissue is just tissue, not the organ