Answer:
D. [tex] O^{2-}[/tex]
Explanation:
In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.
Oxygen has a total number of eight (8) electrons and as such the [tex] O^{2-}[/tex] is able to gain (receive) two (2) more electrons in order to have the same electron arrangements as the noble gas i.e an atom of neon that has a total number of ten (10) electrons.
Hence, [tex] O^{2-}[/tex] contains the same number of electrons as an atom of neon.
1. Salt has the chemical formula NaCl because it is made up of atoms of Sodium (Na) and Chlorine (CI).
Which statement most accurately describes this compound in relation to the elements it is made of?
A. When sodium and chlorine chemically combine they create a substance with completely different
properties
B. Salt has similar properties to the sodium and chlorine it is made of
C. Once salt is formed the sodium and chlorine atoms no longer exist, only salt atoms
D. Salt can easily be separated back into sodium and chlorine atoms through physical means
Answer:
A
Explanation:
When Na atom chemically combine with with Cl atom to form NaCl both atoms loose their chemical properties due to the fact that Na atom transfer an electron to cl atom. after transfer of electron Na atom become Na ion (cation) and Cl atom become Cl ion (anion)
How does energy
change from
potential to
kinetic?
Answer:
An object has potential energy, stored energy, when it is not in motion. Once a force has been applied or it begins to move the potential energy changes to kinetic energy, or motion energy.
Good luck, hope this helped!
how is all the “stuff” around us matter is because it is made up of atoms?
Answer:
Matter is the Stuff Around You
Matter is everything around you. Atoms and compounds are all made of very small parts of matter. ... Matter is defined as anything that has mass and takes up space (it has volume).
Explanation:
hope it was helpful
Which states of matter can form solutions?
A. Gas-liquid
B. Solid-solid
C. Solid-liquid
D. All of the above
Answer:
c
Explanation:
spongebob cheese pants
Answer:
I believe D
Explanation:
im not super sure but I'm pretttyyy sure
Use the following to answer questions. Which of the following is/are not characteristic of an ionic compound?
I. Metal bonded to a nonmetal
II. Conducts electricity when dissolved in water
III. Called a ‘salt.’
IV. High melting point
V. Lattice structure
VI. Electrons are shared between elements
Group of answer choices
VI only
II, IV, and VI
I and III
II and V
Answer:
VI only
Explanation:
(ii) I cannot make the payment today.
(Use 'made' without changing the tense)
Answer:
I made the payment today.
Explanation:
Helpppppp i hate chemistry
I will give brainiest who helps me with the correct answer
I promise
5. Name the compound which contain Strontium, Fluorine, and Oxygen.
Options:
Strontium fluorate
Strontium fluoride
Strontium chlorate
Strontium fluorine
Here is the electron configuration for Argon. What does the coefficient 3 in 3s2 tell us?
Ar: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
The coefficient 3 represents the electron shell
Further explanationIn an atom there are levels of energy in the shell and sub shell
This energy level is expressed in the form of electron configurations.
Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is
• s: 2 electrons
• p: 6 electrons
• d: 10 electrons and
• f: 14 electrons
Charging electrons in the sub shell uses the following sequence:
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.
Argon is a noble gas element with the symbol Ar with atomic number 18 and mass number 40
Electron configuration: [Ne] 3s²3p⁶
The coefficient 3 represents the electron shell, which is denoted as the quantum number n
This shell consists of 3 sub shells namely 3s, 3p and 3d which have a maximum of 18 electrons (3s = 2 electrons, 3p = 6 electrons and 3d = 10 electrons)
In a warehouse, the workers sometimes slide boxes along the floor to move them. Two boxes were sliding toward each other and crashed. The crash caused both boxes to change speed. Based on the information in the diagram, which statement is correct? In your answer, explain what the forces were like and why the boxes changed speed.Box 1 has more mass than Box 2. Box 1 and Box 2 are the same mass. Box 1 has less mass than Box 2
Answer:
There is no friction because of the mass.
Explanation:
The bigger box ran out of force to move so it hit the smaller box. (im in 7th grade and have the answer key)
HELLPPP PLEASE. 50PTS
ITS URGENT
Ella wants to construct an electrochemical cell using the following materials :
1.Salt water (as electrolyte)
2.Copper strip
3.Zinc Strip or Aluminum foil
4.Voltmeter and/or LED (to confirm the passage of electric current)
5.Two beakers
6.Insulated wires
Questions
1.If Ella can't find the copper strip can she use copper wire?
2. Are there any other materials she will need? If so state them.
3. What can she use as a substitute for insulated wire.
4.Write a step to step procedure on how she can construct an electrochemical cell using the given materials listed above.
Answer:
1. Yes, it will have the same effect.
2. No, she will not need anything else.
3. Bare wires.
4. Fill the two beakers up with electrolyte. Connect the two terminals with the wire and put electricity through. Connect the voltmeter to the circuit. And finally, put the two terminals into the two beakers.
Explanation:
Hope this helped!
Need help please ! if someone can answer any of these that would be great !!
Answer:
NH4 ClBa Br2Al4 C3Na2 OK3 PO4Ca F2Li3 NBa CO3Al2 (SO4)3Mg (NO3)2Li2 SNa2 SO4Ca (HCO3)2Ag CH3 COOZn (OH)2Explanation:
Here are all of them- your picture had #1-13, but here's #1-15!Magnesium reacts with hydrochloric acid to produce hydrogen gas and magnesium chloride. What
volume of hydrogen gas is theoretically produced in cubic millimeters, if 4.9 g magnesium reacts
with excess hydrochloric acid? The reaction is taking place at 101.5 kPa pressure and 20°C.
using PV=mRT/Mr
V=(4.9×8.31×(273+20))/(24.3×101.5×10^3)
=4.84×10^-3 m^3
=4.84×10^6 mm^3
The mass of an object can vary with the object’s location true or false
Answer:
true
Explanation:
I just did it
What does temperature measure in a sample of matter? A.The exact speed of the particles B.The average kinetic energy of the particles C.The average number of particles D.The exact atomic number of the particles
Plz answer
Answer: its B. The average kinetic energy of the particles.
Don’t trust the person above
Explanation:
I took the quiz and i got it right
A Temperature is a unit used to represent hotness or coolness on any of a number of scales, including Fahrenheit and Celsius. The direction that heat energy will spontaneously flow depends on temperature. The average kinetic energy of the particles is indicated by temperature. The correct option is B.
Temperature and heat are connected but distinct concepts. The average kinetic energy of a substance's particles is measured by its temperature. The kinetic energy of an object increases with its temperature. A sort of energy connected to motion is called kinetic energy.
The average kinetic energy of the particles in a substance is measured by temperature. The overall kinetic energy of the particles in a substance is measured by its thermal energy. The temperature and thermal energy of a substance increase with particle mobility.
Thus the correct option is B.
To know more about temperature, visit;
https://brainly.com/question/23411503
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Directions: Read through each scenario and identify the independent variable, dependent variable, and the control.
Question 1
1 pts
Rob is in charge of waxing the floor at the local mall. He wants to test a new brand of floor wax called
Squeaky Clean. Rob waxes 20 floor tiles with Squeaky Clean and 20 tiles with the original wax brand.
After one week he counts the number of scratches on the floor. What is the independent variable?
number of floor scratches
brand of floor wax
20 tiles with original brand wax
Answer:
The correct answer is - brand of floor wax.
Explanation:
The independent variable is the variable or the factor in an investigation which is manipulated or change in the experiment and affects the dependent variable and produces a various result.
In this investigation, there are different brands of the floor was are the independent variable as they are changed to see the effect on the scratches on the floor on 20 tiles for each brand.
I WILLL GIVE YOU BRAINLYESTTT PLEASE HELPPPP
Answer:
10.99s
Explanation:
Given parameters:
Speed of the fly = 9.1m/s
Distance flown = 100m
Unknown:
Time taken to fly this distance = ?
Solution:
Speed is distance divided by the time;
Mathematically;
Speed = [tex]\frac{distance}{time}[/tex]
Time = [tex]\frac{distance}{speed }[/tex]
Insert the parameters and solve;
Time = [tex]\frac{100}{9.1}[/tex] = 10.99s
suppose that you are comparing several objects. is it correct to say that the object with the largest volume has the largest mass? explain your reasoning, and include an example. help!! asap!!
Answer:
No
Explanation:
It is not correct to say that an object with the largest volume has the largest mass.
Mass and volume are not directly related. In fact, the relationship between them can be direct or inverse.
Mass is the amount of matter in a substance. Volume is the space a body occupies.
A balloon and a stone for example is a typical one. A balloon has more volume but far lesser mass compared to a stone. A stone, gravel sized has low volume but more massive than a balloon.Therefore, it is wrong to say a balloon has more mass because it has more volume.
how is a solute and a solvent different
What igneous rock is non-vesicular and glassy in texture and has a mafic composition?
Answer:
igneous rock
Explanation:
An animal cell placed in a hypertonic solution will shrink in a process called crenation. An animal cell placed in a hypotonic solution will swell and potentially burst in a process called hemolysis. To prevent crenation or hemolysis, an animal cell must be placed in an isotonic solution such as 0.9% (m/v) NaCl or 5.0% (m/v) glucose. This does not mean that a cell has a 5.0% (m/v) glucose concentration; it just means that 5.0% (m/v) glucose will exert the same osmotic pressure as the solution inside the cell, which contains several different solutes. A red blood cell is placed into each of the following solutions. Indicate whether crenation, hemolysis, or neither will occur.
Solution A: 3.21% (m/v) NaCl
Solution B: 1.65% (m/v) glucose
Solution C: distilled H2O
Solution D: 6.97% (m/v) glucose
Solution E: 5.0% (m/v) glucose and 0.9%(m/v) NaCl
Drag each solution to the appropriate bin.
Answer:
Solution A: 3.21% (m/v) NaCl ⇒ CRENATION
Solution B: 1.65% (m/v) glucose ⇒ HEMOLYSIS
Solution C: distilled H₂O ⇒ HEMOLYSIS
Solution D: 6.97% (m/v) glucose ⇒ CRENATION
Solution E: 5.0% (m/v) glucose and 0.9%(m/v) NaCl ⇒ CRENATION
Explanation:
Isotonic solution = 0.9% (m/v) NaCl or 5.0% (m/v) glucose
Crenation will occur if the solution has a concentration higher than 0.9% (m/v) NaCl or 5.0% (m/v) glucose (hypertonic solution). This will occur in the following solutions:
Solution A: 3.21% (m/v) NaCl > 0.9% (m/v) NaCl
Solution D: 6.97% (m/v) glucose > 5.0% (m/v) glucose
Solution E: 5.0% (m/v) glucose and 0.9%(m/v) NaCl (the addition of the 2 components exceeds the osmotic pressure permitted).
Hemolysis will occur if the solution has a concentration lower than 0.9% (m/v) NaCl or 5.0% (m/v) glucose (hypotonic solution). This is the case of:
Solution B: 1.65% (m/v) glucose < 5.0% (m/v) glucose
Solution C: distilled H₂O = 0% glucose/0% NaCl < 0.9% (m/v) NaCl or 5.0% (m/v) glucose
The tundra is characterized by _____.
extremely cold temperatures
high rainfall
long growing seasons
high temperatures
Answer:
Tundra are cold bioms. They include poler bears wolfs rabbits etc
Explanation:
How did the substance oxygen change the world??
Answer: The atmosphere of Earth wasn't always full of oxygen. ... An accidental mutation would some day change the world forever as these organisms would become able to feed off of the sunlight around them, and produce oxygen in a process known as photosynthesis. This oxygen, which none of these organisms could use, was toxic.
Easy Chemistry/ Help
Antacids relif hyperacidity. why? plz help me!!!!
List the 5 signs of a CHEMICAL REACTION
Is it necessary to prepare sodium extract to detect nitrogen in urea ?
Answer:
I think No
Explanation:
Please help meee! It would be awesome if you can!
Answer:
3) the north Pacific Ocean
Explanation:
Maritime polar air is defined officially as: Maritime polar (mP) air masses are cool, moist, and unstable. Some maritime polar air masses originate as continental polar air masses over Asia and move westward over the Pacific, collecting warmth and moisture from the ocean
Basically it's the North Pacific Ocean because of the higher latitude and colder air temperature
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Answer:
fsdafdsafdsafdsafdasfsagfd
Explanation:
Please help me how do i solve this
Answer:120
Explanation:2gfdxxfgngfnf
A bridge usually has expansion joints. They allow the bridge to become slightly longer when it experiences thermal expansion. Look at the
diagram of the bridge joint.
When the weather becomes cool, the "teeth" of the joint move away from each other. When the weather becomes warm, they move toward each
other. Which statement is true about the particles that make up the bridge?
A When the sides of the joint are close together, the particles have more kinetic energy than they do when the sides are farther apart.
B. When the sides of the joint are far apart, the particles have more kinetic energy than they do when the sides are closer together
C. The particles contain the same amount of kinetic energy no matter how much the bridge has expanded.
D. The kinetic energy of the particles changes, but the amount it changes does not depend on the temperature of the bridge,
Answer:
I need help please!!!!!!!!!!!!!!
Explanation: