Answer:
C
Explanation:
the gray moths were able to hide better in the smoky air then cream colored moth and were able to stay alive.
Answer:
C
Explanation:
During the industrial revolution the grey moths could blend in more and have more camouflaged then the crème colored moths, that being said they had a better chance of reproduction and became more populated afterwards. hope this helps! :)
Explain how atoms organize to create larger structures?
Answer:
First of all they are super tiny particles of neutrons, electrons and protons. Then they come together to organize a structure of atom. Atoms come together to form a molecule and smaller molecules work together to form macromolecules. Thus, how they organize and form building blocks of a substance.
Hope it helps!<3
Which set of terms best defines what affects kinetic energy and potential energy, respecrively
Which electromagnetic waves have the shortest wavelength?
O A. Microwaves
O B. Radio waves
C. Gamma rays
O D. X-rays
Answer:
Gamma Rays
Explanation:
Each section of the electromagnetic (EM) spectrum has characteristic energy levels, wavelengths, and frequencies associated with its photons. Gamma rays have the highest energies, the shortest wavelengths, and the highest frequencies.
I looked it up
What is required to cause change in matter
Answer:
Adding or removing energy from matter causes a physical change as matter moves from one state to another. For example, adding thermal energy (heat) to liquid water causes it to become steam or vapor (a gas). And removing energy from liquid water causes it to become ice (a solid). ... Most liquids contract as they freeze.
Explanation:
have a nice day
Which reaction takes place in a nuclear fission reactor?
C+HN
2 Put He → Cm
OCO+ He-Cot 'n
o U+ nKr+Ba+3'n
Answer:
The reaction that takes place in a nuclear fission reactor is answer D.
Explanation:
Step-by-step explanation:
Nuclear fission reactions involves the process by which large atomic nuclei are bombarded with energetic particles and release of an enormous amount of nuclear energy, which mainly ends up as heat energy.
So now, consider the nuclear reaction from D, after the uranium nucleus absorbs the neutron its split into two smaller nuclei (often radioactive themselves), Krypton and Barium and releases more neutrons (or energy).
55. Which Element has a larger radius- Rb or I?
Rb has larger radius.
What happens after condensation to cause precipitation?
A
The sun heats water on the Earth's surface.
B
Water is absorbed into the ground.
C
Clouds fill with moisture and get too heavy.
D
Excess water runs downhill.
Answer:
The answer is c, Clouds fill with moisture and get too hravy
Which of the following statements is true?
Electrons have a positive charge.
Protons and neutrons are found in the nucleus.
Electrons and protons are found in the nucleus.
All shells can hold up to eight electrons.
Answer:
2/ Protons and neutrons are found in the nucleus.
Explanation:
A system performed 145 kJ of work on the surroundings and absorbed 105 kJ of heat from the surroundings. What is the change in energy of the system?
Answer:
250 kJ
Explanation:
Step 1: Given data
Work performed by the system (w): 145 kJ (By convention, when the system performs work on the surroundings, w > 0)Heat absorbed by the system (q): 105 kJ (By convention, when the system absorbs heat from the surroundings, q > 0)Step 2: Calculate the change in the internal energy of the system
The internal energy of a thermodynamic system is the energy contained within it. We can calculate the change in the internal energy (ΔE°) using the following expression.
ΔE° = q + w
ΔE° = 105 kJ + 145 kJ = 250 kJ
1 carbon atom mixed with 1 oxygen atom what is the formula
Answer:
carbon mono oxide CO
Explanation:
as both are in 1:1 ratio so CO is formed
Need help please? Thanks youu
Answer:
A
B
E
Explanation:
"Fission is the splitting of a heavy, unstable nucleus into two lighter nuclei
and fusion is the process where two light nuclei combine together releasing vast amounts of energy"
a process that releases energy is respiration
Which terms describe a substance that has a low melting point and poor electrical conductivity?
(1) Metallic and lustrous
(2) Dull and brittle
(3) Brittle and lustrous
(4) Metallic and dull
Please I have a D in chem and grades close tomorrow ;-;
Which of the following polyatomic lons will form an lonic compound with a single sodium lon?
co₂2-
нсо3^1-
S04^2-
S03^2-
Find the pH of the solution obtained when 0.027 L of 0.063 M benzylamine, C7H7NH2, is titrated to the equivalence point with 0.048 M hydrochloric acid. Kb for benzylamine is 4.7×10-10.
Answer:
pH = 3.12
Explanation:
C7H7NH2 + HCl ---> C7H7NH3+Cl-
moles of C7H7NH2 = 0.027 x 0.063 = 1.7 x 10^-3 mol
moles of C7H7NH2 = moles of HCl at equivalence point
1.7 x 10^-3 = 0.048 x V
V = 0.035 L
volume of HCl = 0.035 L
so C7H7NH3+Cl- salt formed = 1.7 x 10^-3 moles
salt concentration = moles / total volume
= 1.7 x 10^-3 / (0.027 + 0.035) = 0.027M
this salt formed from weak base strong acid . so pH <7
pH = 7 - 1/2 [pKb + logC]
pH = 7 -1/2 [9.33 + logC]
pH = 3.12
Phosphorus trichloride, PCl3, is commonly used in the chemical industry as a source of phosphorus in various reactions. Indicate the electron pair geometry and the molecular geometry of the PCl3 molecule. Electron pair geometry: T-shaped tetrahedral trigonal planar trigonal pyramidal trigonal bipyramidal Molecular geometry: tetrahedral trigonal pyramidal trigonal bipyramidal trigonal planar T-shaped
Answer:
Electron pair geometry - tetrahedral
molecular geometry- trigonal pyramidal
Explanation:
According to Valence Shell Electron Pair Repulsion Theory, the shape of a molecule is determined by the number of electron pairs around the central atom in the molecule. Lone pairs distort a molecule away from its expected geometry based on VSEPR. This is why the electron pair geometry differs from the actual molecular geometry.
PCl3 has four regions of electron density, three substituents and one lone pair hence its electron pair geometry is tetrahedral. However, the three substituents are arranged in a trigonal pyramidal geometry(its molecular geometry).
Someone took the last cookie from the cookie jar last night. The last person to leave the scene is the culprit. Who was it? Highlight the guilty culprit based on the clues provided.
What is the hydrogen ion molarity of a solution with a pH of 10.16
The hydrogen ion molarity : 6.918 x 10⁻¹¹ M
Further explanationpH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.
pH = - log [H⁺]
So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.
A solution whose value is different by n has a difference in the concentration of H⁺ ion of 10ⁿ.
pH of solution = 10.16
the [H₃0⁺] of the solution :
[tex]\tt pH=-log[H_3O^+]\\\\10.16=-log[H_3O^+]\\\\(H_3O^+]=10^{-10.16}=6.918\times 10^{-11}[/tex]
15 points! Answer only if you can please!
1. Have you ever grabbed the handle of a hot metal pan? Why did it feel hot to you?
2. What would happen if a person who is wearing a heavy winter jacket were to place a thermometer inside the jacket next to his or her skin? What would happen if we took the same jacket, after it had been hanging in a closet, and placed a thermometer inside?
3. How do you think the transfer of thermal energy causes unpopped popcorn kernels to pop?
Answer:
1. Yes
2. it would be the same i guess
3. because it travels to popcorn kernels with its heat and makes it pop'
did i get it right?
Explanation:
Argon (Ar) is an element in group 18. Argon is _____.
a gas highly reactive
a metalloid
a good conductor of heat
Answer:
c
Explanation:c
it is a good conducter
19.
Caustic soda is 20 M NaOH and is olluted for household use. What is the household concentration of 10
mL of the concentrated solution is diluted to 500 ml?
(A) 0.4 M N OH
(B) 400 M NaOH
(C) 4 M NaOH
(D) 20M NaO
Answer:
(A) 0.4M NaOH
Explanation:
The 20M NaOH caustic soda is diluted from 10mL to 500mL, that is:
500mL / 10mL = Is diluted 50 times.
That means we can solve the new concentration of the diluted solution dividing the stock concentration (20M) 50 times:
20M / 50 = 0.4M NaOH is the concentration of the diluted NaOH solution.
Right answer is:
(A) 0.4M NaOHWhat mass of dinitrogen monoxide, N2O, contains the same number of molecules as 3.00 g of trichlorofluoromethane, CCl3F?
Answer:
0.9612 g
Explanation:
First we calculate how many moles are there in 3.00 g of CCl₃F, using its molar mass:
3.00 g CCl₃F ÷ 137.37 g/mol = 0.0218 mol CCl₃FNow, we need to calculate how many grams of N₂O would have that same number of molecules, or in other words, the same amount of moles.
Thus we calculate how many grams would 0.0218 moles of N₂O weigh, using the molar mass of N₂O :
0.0218 mol N₂O * 44.013 g/mol = 0.9612 g N₂OThe mass of dinitrogen monoxide is 0.9612 g
The calculation is as follows:The number of moles are there in 3.00 g of CCl₃F, using its molar mass:
= 3.00 g CCl₃F ÷ 137.37 g/mol
= 0.0218 mol CCl₃F
Now the mass should be
=[ 0.0218 mol N₂O × 44.013 g/mol
= 0.9612 g N₂O
Learn more: https://brainly.com/question/5763151?referrer=searchResults
What is the degree of oxidation of a simple substance
Answer:
The oxidation state of a free element (uncombined element) is zero. For a simple (monoatomic) ion, the oxidation state is equal to the net charge on the ion. For example, Cl– has an oxidation state of -1. When present in most compounds, hydrogen has an oxidation state of +1 and oxygen an oxidation state of -2
What is the structural formula of CF2Br2
Answer:
Dibromodifluoromethane
Explanation:
Write balanced equations for the reaction of Mg(OH)2 with stomach acid (HCl). Express your answer as a chemical equation. Identify all of the phases in your answer.
Answer:
Mg(OH)₂(s) + 2HCl(aq) ----> MgCl₂(aq) + 2H₂O(l)
Explanation:
Magnesium hydroxide is a white solid that is sparingly soluble in water. It is a basic hydroxide, therefore it neutralizes acids to form salt and water.
Magnesium hydroxide commonly used as an antacid, for example milk of magnesia, because it reduces stomach acid, and increases water in the intestines which may induce bowel movements. It also relieves indigestion, sour stomach, and heartburn. Magnesium hydroxide is also used as a laxative to relieve occasional constipation.
The equation for the reaction between magnesium hydroxide and stomach acid, HCl, is as follows:
Mg(OH)₂(s) + 2HCl(aq) ----> MgCl₂(aq) + 2H₂O(l)
How much did one drop of HNO3 cause the pH of water to change?
Answer:
-4
Explanation:
It went from a 7 to a 2 and 7-2 is 4, so it changed by 4 and it went down by 4.
One drop of HNO3 will cause the pH of water to change from 7 to 3
What is effect of addition of acid to pH of a water?
The pH of a solution is the negative logarithm of the hydrogen ion concentration of the solution.
pH = - log[H⁺]At equilibrium, the pH of water = 7
The concentration of hydrogen ions is 10⁻⁷ M
If 0.1 mL (about one drop) of 1.0 M HNO3 is added to 100 mL of water: the volume of solution is 100.1 mL and the concentration of solution is calculated thus:
C₁V₁ = C₂V₂
C₂ = C₁V₁/V₂
C₂ = 0.1 * 1/100.1
C₂ = 9.99 * 10⁻⁴ M
Hydrogen ion concentration, [H⁺] = 9.99 * 10⁻⁴ M
pH = - log(9.99 * 10⁻⁴)
pH = 3
Therefore, one drop of HNO3 will cause the pH of water to change from 7 to 3
Learn more about pH at: https://brainly.com/question/13557815
what is protein denaturation
Answer:
Denaturation is a process in which proteins or nucleic acids lose the quaternary structure, tertiary structure, and secondary structure which is present in their native state, by application of some
Explanation:
Which isomer of 1-bromo-2-tert-butylcyclohexane reacts faster when refluxed with potassium tert-butoxide?Draw the structure of the expected major product from the faster reacting compound.
Answer:
See explanation and image attached
Explanation:
The reaction of 1-bromo-2-tert-butylcyclohexane with potassium tert-butoxide is an elimination reaction that occurs by E2 mechanism.
The E2 reaction proceeds faster when the hydrogens are in an antiperiplanar position at an angle of 180 degrees.
This is only attainable in the trans isomer of 1-bromo-2-tert-butylcyclohexane. Hence trans 1-bromo-2-tert-butylcyclohexane reacts faster with potassium tert-butoxide
What is the frequency of this wave?
1
2
3
4
What is a solute?
A material that is dissolved in another material.
O A material in which another material is dissolved.
An area of space surrounding the nucleus.
O Chemical formulas on the left side of an equation.
Justin is making a snack. He toasts a piece of bread and first peanut butter and jelly on it. Then he cut an apple into several slices and adds these to his plate. Next Justin mixes a scoop of lemonade powder into a glass of water mixes it in Dad's ice. How many chemical changes occurred in this scenario? 1 2 three or four
Answer:
2
Explanation:
Toasting bread and lemonade powder in water are chemical changes. Pb&j on bread and cutting apple are physical changes.
Answer:
b
Explanation: