which terms are used to identify pure substance
Answer:
Physical properties of a substance are characteristics that can be observed without altering the identity of the substance. Color, odor, density, melting temperature, boiling temperature, and solubility are examples of physical properties. Physical properties can be used to identify a pure substance.
Explanation:
water is always subject to the law of
Answer:
motion
Explanation:
i just know things
What happens to the pressure if the gas volume is cut in half while n and I are
held constant?
Answer: You can use Boyle's law, which states that pressure is inversely related to volume when other variables are held constant. If the final pressure of a gas is half of the initial, the volume must double if temperature is to remain the same.
Explanation:
What is the mole fraction of sodium chloride in a solution containing 0.23 moles of NaCl and 5.5 moles of water?
Answer:
0.040
hope this helps :)
Explanation:
NaCI=mol NaCI/mol NaCI+mol H2O
NaCI=0.23 mol/0.23 mol+5.5 mol
NaCI=0.23 mol/5.73 mol=0.040
How many inches/second are in
1.73 meters/minute?
A. 68.1 in./s
B. 0.0288 in./s
C. 1.14 in./s
D. 2.64 in./s
Answer:
1.73 meters / minute = 1.14 inches / second
Explanation:
The number of inches present in 1.73 meters/minutes is equal to 1.14 inches/seconds.
What is conversion factor?Conversion factor is a quantity which is get multiplied or divided with an any other given quantity to convert the given quantity into any other quantity.
Given quantity = 1.73 m/min
We know that, 1 meter = 39.37 inches
1.73 m/min = 1.73 × 39.37 = 68.11 inches/min
Also we know that, 1 min = 60 min to convert the above quantity into sec we should divide that by 60 as:
68.11 inches/min = 68.11 / 60 = 1.135 inches/sec (1.14)
Hence the required quantity is 1.14 in./s.
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PLEASE ANSWER SOON THIS IS DUE IN LIKE, 5-10 MINS
Which pair have the same electron configuration? You may use the periodic chart
Cl- and Ar
Cl and Ar
Cl- and Ar-
Cl+ and Ar
Two substances each have a
temperature of 23 degrees Celsius.
After they are combined the
temperature rises to 27 degrees
Celsius. What evidence proves a
chemical reaction occurred?
In going across a row of the periodic table, protons and electrons are added and ionization energy generally increases. In going down a column of the periodic table, protons and electrons are also being added but ionization generally decreases. Explain.
Answer:
Explanation:
Ionization energy:
It is the minimum amount of energy required to remove the electron from isolated gaseous atom to make the ion.
As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell.
When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required. Where as,
When we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
As the size of atom increases the ionization energy from top to bottom also decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.
Ill mark brainleist please helppp
Answer:
rusting, cooking and burning wood
Which Respiratory organ is responsible for giving oxygen to the bloodstream?
-Bronchi
-Trachea
-Alveoli
-or Larynx?
Answer:
I think that it is Trachea
Why are scientists now more excited about sound levitation than they had been previously?
SELECT AN ANSWER
Sound levitation was previously only a theory and has only now been done experimentally.
By using sound levitation at the right frequency, scientists can break objects like glass.
The cost of sound levitation has decreased dramatically over the past decade.
Research has shown scientists can control the movement of liquids with sound without touching the liquid
Answer:
Acoustic tractor beams use the power of sound to hold particles in mid-air, and unlike magnetic levitation, they can grab most solids or liquids even small insects. For the first time engineers have shown it is possible to stably trap objects larger than the wavelength of sound in an acoustic tractor beam. This discovery could enable the manipulation of drug capsules or micro-surgical implements within the body. The discovery could even lead to levitating humans.
Explanation:
Two scientists write a paper detailing their research and conclusions and submit it to a scientific journal. Several
months later, the publisher sends them back the paper. Many comments from several fellow scientists are attached.
Which step will the authors of the paper most likely take next?
They will change their research to a different topic and start all over again
O They will alter the data to match the results that their peers were expecting.
O They will incorporate the suggestions from their peers and resubmit the paper.
They will sue the journal for delaying their research and not printing the paper
Answer:
C
Explanation:
I just took the test
Answer: They will incorporate the suggestions from their peers and resubmit the paper.
Explanation:E 2022
explain all ways your atom and symbol for it would change if you removed 2 electrons from the atom
Each atom/element has an electron configuration
The electron configuration shows the energy level of the electron
Each electron configuration has 4 quantum numbers, namely n, l, ml, and ms
n = the principall = the angular momentum / azimuthal ml = the magnetic ms = the electron-spinWe make an example of the element Mg which is in group 2 with the atomic number 12
Electron configuration of Mg: [Ne] 3s² or 1s² 2s² 2p⁶ 3s²
if Mg removes 2 electrons then Mg will form a positive ion (cation) Mg²⁺
This cation is included in the monatomic ion because it is formed from one element (in contrast to the polyatomic ion, which is formed from two or more elements such as SO₄²⁻, ClO₃⁻)
Electron configuration of Mg²⁺ : 1s² 2s² 2p⁶
So atoms can be positively or negatively charged depending on removing or attracting electrons
Which of the following distinguishes an element from all other elements?
Its number of protons.
O
Its color in solid form.
o
Its phase at room temperature.
Its group in the Periodic Table.
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Answer:
Explanation:
The second best answer is its group on the periodic table.
That answer depends on the actual reason. The number of protons determines which element you are talking about.
Molecules are
Group of answer choices
2 elements bound together
2 atoms bound together
2 or more atoms mixed together
2 or more atoms bound together
What are the three was main States of matter?
Answer:
liquid, solid, gas
Explanation:
Solid, Liquid and gaseous
There are 5 states of matter
1.) Solid
2.) Liquid
3.) Gaseous
4.) Plasma
5.) Bose Einstein
the First three are main
Use two analogies to describe quantized change.
Answer:
See explanation
Explanation:
1) A flight of stairs because there is a specific number of steps one may take at a particular time. That is, the number of steps that can be taken at a given time is not continuous.
2) The gear system of a car: The gear system of a car can only take whole number integer values. It is not continuous and only one level of gear can be attained at a given time.
The two analogies that I used to describe quantized change are;
- Notes on a Piano
- Digital Clock
Quantized change is simply means that the change is definite under certain restrictions such as the gears in our cars. This means that change comes in discreet amounts.
The 2 analogies that I can use to describe it are as follows;
1) Notes on a Piano; When we are turn on a piano, the notes on the piano are fixed and as such we can only play the notes that the keys can hit.
2) Digital clock; The representation of time in digital clocks is in terms of numbers which can be said to be discrete variables.
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The simple representation of a compound showing the ratio of elements is the___ formula.
Answer:
Chemical formula
Explanation:
because chemical formulas use chemical elements , symbols , and numbers to present information about the chemical proportions.
Which of the following is a result of intermolecular forces
A. Hydrogen bonds
B. Electronegativity
C. Double bonds
D. Covalent bonds
An element has a shiny metallic appearance and is both ductile and malleable. In which section of the diagram would the element most likely be found?
A.
1.
B.
2.
C.
3
D.
4
Answer:
Section 2 on the diagram (Option B)
Explanation:
These metals can be shiny, ductile, malleable, and are good conductors of heat and electricity.
An empty truck and a fully loaded truck are next to each other at a traffic light. When the light turns green, the lighter truck increases speed more quickly. Which of these best explains the situation?
Answer:
Newton's Second Law
Explanation:
Newton's second law of motion states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
(I'm going to assume this is an option, but please let me know if it's not!)
Can someone help me answer this ASAP!! thank you!
The molecular geometry of molecules is given serially as, tetrahedral,trigonal,tetrahedral,tetrahedral,linear,linear.
What is molecular geometry?Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.
It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.
They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.Neutron and electron diffraction techniques provide information about the distance between nuclei and electron density.
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How do molecules move in gas
Answer:
They become fast that they don't touch each other
Explanation:
That's it sorry that I can't help any further
How much space would one mole of grass take up?
Answer:
If there's a grass area in the shape of a square and one side is 8 metres how much would it cost to fill the grass with fresh gravel at $5/metre
What type of energy results from the burning of wood or gasoline?
electric
nuclear
chemical
Answer:Electric
Explanation: Its right.
Chemical energy results from the burning of wood or gasoline. Therefore, option (C) is correct.
What is chemical energy?Chemical energy is described as the energy which is stored in the chemical bonds formed in the chemical compounds. It is liberated during the chemical reaction and produces heat as a side-product which is known as an exothermic reaction.
Examples of chemical energy are biomass, natural gas, batteries, petroleum, and coal. When chemical energy is released from a compound, it is transformed into a completely new substance.
While burning wood or fuel, the chemical energy in the wood or gasoline is liberated as heat because of the chemical reaction of oxygen in the air and wood. This kind of chemical reaction is known as a combustion reaction. Combustion reaction converts the chemical energy stored in the wood into light energy and heat.
Therefore, in the burning of wood or gasoline, chemical energy is emitted.
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A mass spectrometer has determined the mass and abundances of all isotopes of an unknown element. The first isotope has a mass of 38.96amu (93.28%) and the second a mass of 40.96amu (6.72%). Calculate the average atomic mass and identify the unknown element, WRITE ONLY THE SYMBOL FOR YOUR ANSWER.
Answer:
I believe it is Potassium (K)
Explanation:
I did the math on a calculator and it was the closest atomic mass to potassium.
2. Which part of the scientific method involves making an educated guess?
Conclusion
hypotheisis
experiment
Resulsts
Answer:
The part of the scientific method that involves making an educated guess is the "hypothesis".
Explanation:
Which particle matters the most when it comes to stable atom protons or neutrons?
Answer:
Protons
Explanation:
Protons are worth 1, while neutrons are neutral and are worth zero.
Consider a wooden chair and a balloon. What do these two
objects always have in common?
A.Both are made of the same number of atoms.
B.Both have the same mass number.
C.Both are made of the same kind of atom.
D.Both are made of atoms.
Answer:
D)
Explanation:
It is the most realistic
What is found in the outer region of the electron cloud
