Answer:
Important
Explanation:
How can a soda can and illumine foil be the same mass?
Answer:
Foil is made from the same material as soda cans (aluminum), but since it's most often contaminated with food waste or combined with plastic (like with yogurt tops), there's no guarantee you can recycle it with your aluminum cans.
Explanation:
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which of the following is most acidic oxide?
a.Na2O
b.Al2O3
c.P2O5
d.SO3
And why it is most acidic oxide?
-i effect required here
Let's see which oxide shows more -i effect
Na-Group 1 Al-Group 15P-Group 15S -Group 16P lies below Al
And -i effect increases down the group so acidity increases
P_2O_5 is more acidichow many moles are in 2.5g of n2
Answer:
0.089
Explanation:
n= m/M = 2.5/14 = 5/28 mol
ok done. thank to me :>
What is a chemical bond?
A. An intramolecular force holding 2 atoms together
B. An attractive force between 2 molecules
C. A gravitational force holding electrons in their orbits
D. An electrostatic force between a proton and an electron
A chemical bond is an electrostatic force between a proton and an electron. Hence, option D is correct.
What is a bond?A chemical bond is what holds atoms together in molecules.
A chemical bond is what holds atoms together in molecules.
Bonds arise from the electrostatic forces between positively charged atomic nuclei and negatively charged electrons (the positions of which in space are determined by quantum mechanics).
Hence, option D is correct.
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HELP PLEASE GIVING OUT BRAINLIEST AND A LOT OF POINTS!!
why do we use acid during the detection of halogens
Answer:
Nitric acid decomposes sodium cyanide and sodium halide. else, they precipitate in test and misguide the result. Therefore, dilute nitric acid is added before testing halogens to expel all the gases if evolved.
germanium has a cubic closest packed structure as a solid. assuming that germanium has an atomic radius of 159 pm, calculate the density of solid germanium.
Answer: Germanium has a cubic closest packed structure as a solid. Assuming that germanium has an atomic radius of 159 pm, calculate the density of solid germanium. __________ g/cm3 b.) Germanium has a face-centered cubic unit cell. The density of germanium is 5.32 g/cm3. Calculate a value for the atomic radius of germanium. ___________pm c.) You are given a small bar of an unknown metal X. You find the density of the metal to be 12.0 g/cm3. An X-ray diffraction experiment measures the edge of the face-centered cubic unit cell as 3.89 Å (1 Å = 1 ✕ 10−10 m). Identify X.
Explanation:
The density of Germanium is equal to 5.30g/cm^3
Data Given;
atomic radius = 159pmFor a cubic closest packed = 4r
[tex]4r = \sqrt{2a} \\ a = \frac{4}{\sqrt{2} }r\\ a = \frac{4}{2}*159*10^-^1^0\\ a = 4.50*10^-^8cm[/tex]
Density of the cubeThe density of the cube is given as the ratio between the mass and volume. But in this case, we have a formula
[tex]d = \frac{Zm}{Na^3}\\ d = \frac{4*72.64}{6.023*10^2^3*9.09*10^-^2^3}\\ d = 5.30 g/cm^3[/tex]
NB;
Z = number of facem = molar massN = Avogadro's constanta = side lengthThe density of the cube is equal to 5.30g/cm^3
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how would you distinguish a simple microscope from a compound one
Answer:
A simple microscope employs a concave mirror. A compound microscope employs a plane mirror at one side and a concave mirror at the other. It contains only one adjustment screw to move the limb up and down for focusing on the object.
Answer:
D po
Explanation:
Sana nakatutulong
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1. A substance which takes the shape and volume of its container is a?
Solid
Liquid
Gas
Crystal
Answer:
Liquid
Explanation:
Liquid
Answer:
Gas
Explanation:
Gas takes the shape and volume of its container because it doesn't have a definite shape or volume.
Liquid is wrong because it takes the shape of its container, but has a definite volume.
Gas is wrong because it has a definite shape and volume.
Crystal is definitely wrong.
Which group has the maximum number of valence electrons attainable?
Answer:
group 18
Explanation:
Elements with the most valence electrons are in group 18
what is solubility?
Answer:
the ability to be dissolved, especially in water.
Explanation:
what is the function of the lungs
Answer:
the lungs are part of the respiratory system
Explanation:
Allows you to talk and to smell
Oxygen to the cells in your body
and helps you breathe
Answer:
Your lungs are part of the respiratory system, a group of organs and tissues that work together to help you breathe. The respiratory system's main job is to move fresh air into your body while removing waste gases.
Explanation:
Main functions of the lungs : -
Inhalation and Exhalation Are Pulmonary Ventilation - That’s Breathing External Respiration Exchanges Gases Between the Lungs and the Bloodstream.Internal Respiration Exchanges Gases Between the Bloodstream and Body TissuesAir Vibrating the Vocal Cords Creates SoundOlfaction, or Smelling, Is a Chemical Sensationthe electron configuration of an element describes _____.
Answer:
here
Explanation:
This is the electron configuration of the element carbon.
How does collision theory relate temperature to the rate of a reaction?
Answer:
Explanation:
The collision theory explains why reactions occur between atoms, ions, and molecules. With the increase in temperature, there is an increase in the number of collisions. Increasing the concentration of a reactant increases the frequency of collisions between reactants and will, therefore, increase the reaction rate.
Will this reaction occur?
Ca+AlCl3 —>
A.Yes
B.No
Answer:
A.Yes
Explanation:
(Total for Question 3-5 marks)
Q4. Carbon monoxide and hydrogen are used in the manufacture of methanol (CH3OH)
The reaction is reversible and can reach a position of dynamic equilibrium.
CO(g) + 2H, (g) = CH OHg) AH = -91 kJ/mol
The reaction is carried out at a pressure of about 100 atmospheres and a temperature of 250°C.
(a) State two features of a reaction that is in dynamic equilibrium.
1
2
Page 9 of 11
Answer:
1. Forward and Backward reaction rate are equal
2. Concentration of reactants and products are the same.
please help me get this done
Answer:
I believe tha answer is travels at the same speed of light
Explanation:
hope this helps
what is the number of electrons in a potassium atom
Answer:
19 electrons, that's what I say
3. What must you have when you pray?
Answer:
when you pray you will feel a peace and happiness in your heart
A student graphed the position of a cart during a 7-second time interval.
Which statement best describes the cart?
A.
The cart was stationary except for a short burst of acceleration of 0.5 m/s².
B.
The cart accelerated at a constant rate of approximately 0.8 m/s².
C.
The cart was stationary with a velocity of 0 m/s for the entire 7 seconds.
D.
The cart moved at a constant velocity of 0.5 m/s for the entire 7 seconds.
The cart accelerated at a constant rate of approximately 0.8 m/s². Option (B) is correct.
Option B is the best description based on the graphed position data during the 7-second time interval. The cart's acceleration can be determined by analyzing the shape of the position-time graph.
If the cart was stationary, the position-time graph would be a horizontal line (option C). If the cart moved at a constant velocity, the graph would be a straight line inclined at a constant angle (option D).
However, the graph likely shows a curved line, indicating changing position over time. This suggests that the cart experienced acceleration. To further confirm, calculate the acceleration:
Acceleration (a) = Δv / Δt,
where Δv is the change in velocity and Δt is the change in time.
Given the time interval is 7 seconds, and the initial and final velocities are likely different, you can calculate the average acceleration. If the average acceleration is approximately 0.8 m/s², then option B is correct.
The graphed data aligns with the scenario of constant acceleration, supporting option B.
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Regina found an accelerant at the crime scene. What did she MOST likely find?
A.
a stash of unused bullets
B.
a bottle of luminol
C.
a container of gasoline
D.
a soda can filled with ashes
Answer:
c
Explanation:
mostly it used in movies in the crime scence
Accelerants are flammable solvents such as kerosine, turpentine, gasoline etc. Therefore, the accelerant obtained from the crime scene here, is gasoline.
What are accelerants?Accelerants are substances that can combine, blending, or disturb another substance, causing the speed of a natural or artificial chemical process to increase. Accelerants are important in chemistry because they can speed up most chemical reactions.
Accelerants change a chemical bond, accelerate a chemical process, or restore organisms to homeostasis. Accelerants are not always catalysts because they can be consumed by the process.
Flammable gases or solvents such as gasoline, diesel, butane gas, kerosine, turpentine etc are examples of accelerants. Therefore, among the given substances , gasoline is the accelerant.
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Imagine yourself making a nice cup of tea on a cold winter day. You begin by boiling some water in a kettle. Next, you add the steaming liquid to your cup. Then, you open a tea bag and repeatedly dunk it into the water. You pour a dash of milk and drop a few sugar cubes into the cup, stirring the solution with a spoon. Finally, you squeeze a bit of lemon into your tea mixture. However, before you have time to stir the lemon juice into your tea, the liquid forms clumps. In other words, your tea has curdled!
Based on the scenario, answer the questions below.
Which of the four indicators of a chemical change is described in the paragraph above?
What makes the tea with milk and lemon curdle?
Name some of the chemical substances in the tea mixture. (You will need to conduct some research on your own to do this.)
Which chemicals could have reacted to cause the curdling?
What is the value of c?
56.70
Due to the lack of information provided, the best I can give you is this:
In Chemistry, the letter c most commonly refers to specific heat, which is present in the ratio J/g°C.
Hope it helps :)
describe the motion and arrangement of particles in a solid, a liquid, and a gas.
Answer:
gas vibrate and move freely at high speeds. liquid vibrate, move about, and slide past each other. solid vibrate (jiggle) but generally do not move from place to place.
Hopefully this helped!
for a molecule to exhibit hydrogen bonding the h must be covalently bonded to a?
Answer:
: fluorine, oxygen, or nitrogen.
Explanation:
Hydrogen bonding occurs only in molecules where hydrogen is covalently bonded to one of three elements: fluorine, oxygen, or nitrogen.
Hydrogen bonding occurs only in molecules where hydrogen is covalently bonded to one of three elements: fluorine, oxygen, or nitrogen. These three elements are so electronegative that they withdraw the majority of the electron density in the covalent bond with hydrogen, leaving the H atom very electron-deficient. The H atom nearly acts as a bare proton, leaving it very attracted to lone pair electrons on a nearby atom.
In the chloroplast, energy in sunlight is passed around different chlorophyll molecules until it reaches a specific chlorophyll molecule that can transfer energy in sunlight to an energized electron. This chlorophyll molecule is called the accessory pigment. electron-carrier molecule. nucleus. photoelectric point. reaction center.
Answer:In the chloroplast, energy in sunlight is passed around different chlorophyll molecules until it reaches a specific chlorophyll molecule
Explanation:
Answer: In the chloroplast, energy in sunlight is passed around different chlorophyll molecules until it reaches a specific chlorophyll molecule
Can someone help me with this chemistry question?
Answer:
B no. is the answer because
Explanation:
acids increase the hydrogen ion concentration, which provides more ionsan acid comes in contact with a metal, the acid steals free electrons away. That loosens the bonds holding metal atoms in place, so the metal dissolves. That's a chemical change, so the ability of acids to dissolve metals is a chemical propertyWhen a strong acid is neutralized by a strong base there are no excess hydrogen ions left in the solution. The solution is said to be neutral as it is neither acidic nor alkaline. The pH of such a solution is close to a value of 7; the exact pH value is dependent on the temperature of the solution.So this can probably be the the answer
Hope my answer helps
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What do all atoms in a period (horizontal rows) have in common?
Answer:
All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons.
hope this helps
Explanation:
Elements in the same period are those that are in a single horizontal line from left to right. They do not share the same type of chemical reactivity as seen in groups. They only real thing that these elements share in common is the same principal quantum number, or main energy shell.
how does the molecular geometry change if you replace a bond with a lone pair?
Answer:
The overall molecular shape (the molecule geometry) changes because of the lone pairs repulsion, but the electron geometry does not change because whether an atom or a lone pair is added there's still two electrons being added.
Explanation:
hope that helps :D
Answer:
Un par solitario o par de electrones no compartidos es un par de electrones de valencia que no se encuentra formando un enlace, ni compartido con otros átomos. Cuando un átomo se agrupa con otros para formar una molécula, sus electrones más externos -también conocidos como electrones de capa de valencia- dejan de pertenecer únicamente al átomo del que provienen, pasando a pertenecer a la molécula formada. Los orbitales atómicos de valencia dejan de existir como tales y pasan a formar orbitales moleculares con características diferentes a las originales. Como los pares solitarios se encuentran en la capa más externa de los átomos, cuando estos átomos forman moléculas pasan a formar parte del conjunto de electrones de valencia de la molécula. De esto se deduce que los pares solitarios son, de hecho, un subconjunto de los electrones de valencia de la molécula a la que pertenecen.
Explanation:
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How much heat is required to change 235 g of iodine at 25 degrees celsius into vapor at 198 degrees celsius? The melting point is 113.5 degrees celsius and the boiling point is 185.4 degrees celsius.
Answer:
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