Answer:
An element with 1only one valence electron is extremely reactive while an element with 8 valence electrons is very stable and does not react most of the times
Explanation:
Valency is the number of electrons in the outermost shell of the atom. It shows the ease with which elements react and combine with each other.
An element can take a maximum of 8 electrons in most of its outermost shells. As a matter of fact, the goal for its stability is to attain a structure with all 8 slots for electrons in its outer shell filled up. The element can either do this by adding or removing electrons.
The ease with which it adds or removes the electrons shows its reactivity. If it has only one electron to lose, (the valence electron) the element will be very reactive because this is relatively easier to do when compared with 2 electrons, three electrons, and so on. An element with 8 electrons in its outer shell is very stable and does not need to react anymore. an example of this is Neon and Argon.
How many electrons are being shared between the two carbon atoms in the covalent compound ethyne? Ethyne has the structure: H−C≡C−H
Answer:
Three lines between the carbon atoms in the Lewis structure represent three covalent bonds. Each covalent bond is a shared pair of electrons, hence there are six electrons being shared between the carbon atoms in ethyne.
The number of electrons that are being shared between the two carbon atoms in the covalent compound ethyne is six.
What are covalent bonds?Covalent bond are formed by the sharing of electrons between two atoms.
In ethyne molecule two carbon atoms are present and between two carbon atoms three covalent bonds are present. And each covalent bond is formed by the sharing of two electrons. So three covalent bonds are formed by the sharing of 6 electrons.
Hence in ethyne 6 electrons are being shared.
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How many molecules are present in 0.93 grams of Fe2O3?
Answer:
5.8125*10^-3
the moles in Fe2O3 are 0.93/(56*2 + 16*3) = 5.8125*10^-3
How many moles are there in 3.9 grams of potassium
Answer:0.025576559594663 mole.
Explanation:
Which statement best describes the relationship between changes in air pressure and wind speeds?
Answer:
air pressure is the air around you that ahs weight and it presses everytime you touch , wind speeds is the amount of wind formedin weather
Explanation:
Answer: The greater the difference in pressure, the faster the winds. When a high- and a low-pressure air mass are far apart, air moves slowly from high to low pressure
Explanation: Hope this helps :)
You have two samples, one is calcite and the other is halite.
How would you differentiate between without using any equipment?
A- Colour
B- Specific gravity
C- Hardness
D- Cleavage
Answer:
c
Explanation:
You can differentiate between calcite and halite without using any measuring equipment based on: C. Hardness.
What is a mineral?A mineral can be defined as a form of naturally occurring, inorganic solid substance that is typically characterized by a crystal structure.
The properties of a mineral.In Science, the properties that can be used to identify and differentiate two or more minerals include the following:
LusterStreakHardnessIn conclusion, hardness is a mineral property that can be used to differentiate between calcite and halite without using any measuring equipment.
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Rain that containing excess of acid is called
Answer:
The rain containing excess of acid I called acid rain
Answer:
acid rain
Explanation:
Thats literally what its called
How many moles are represented by 3.01 x10^24 oxygen atoms?
5.00 mol O₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
3.01 × 10²⁴ atoms O₂
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 3.01 \cdot 10^{24} \ atoms \ O_2(\frac{1 \ mol \ O_2}{6.022 \cdot 10^{23} \ atoms \ O_2})[/tex]Multiply/Divide: [tex]\displaystyle 4.99834 \ mol \ O_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
4.99834 mol O₂ ≈ 5.00 mol O₂
A car accelerates from 20 m/s to 40 m/s in 4 seconds. What is the car’s acceleration?
Answer:
40 - 20 = 20
20/4 = 5m/s
The difference in velocity divided by the rate = acceleration.
What is the role of an electron in an atom?
Electrons live inside the nucleus and carry a neutral charge.
Electrons circle the nucleus and have a positive charge.
O Electrons determine the reactivity of an atom.
Electrons act like a glue to hold the nucleus together
Answer
Electrons live inside the nucleus and carry a neutral charge.
Explanation:
during a heating or cooling process, how are changes in enthalpy and temperature related?
Answer:
answer this and ill answer that
Explanation:
during a heating or cooling process, how are changes in enthalpy and temperature related?
What is the answer, just the letter. No explanation needed
Answer:
Explanation:
f i did this in my class
Answer:
3 rd
Explanation:
yes answer is 3 you can go with it
……….CO + ………H2 --> C8H18 + ……… H2O
Answer:
8CO + 17H2 = C8H18 + 8H2O
8, 17, 1, 8
I need help and if you don’t know you don’t have to tell me!
At Ocean World, Wally the Whale uses 800 Newtons of force to jump out of the water 10 meters into the air. Wally does this trick four times a day. He is able to get 10 meters high in 3.5 seconds. How much work does Wally do each day? What is his
average speed with each jump?
I need to the Force, Distance, time, Average speed and work!
Answer:
i did this assignment today, so u and i might be classmates :3 answer is shown below in 'explanation.'
Explanation:
the roller coaster assignment: force: 160 newtons. distance: 40 m high. time: 10 sec. work: 6400. average speed: 4 km.
for the whale assignment: force: 800 newtons. Distance: 10 meters. time: 3.5 seconds. work: 8,000 J. Average speed: 2.85
for the car: force: 1400 newtons. Distance: 800 m. time: 40 minutes. work: 1,120,000. average speed: 20.
moving company: force: 600. Distance: 80 m. time: 50 min. work: 48,000. average speed: 1.6.
I hope this is correct, bc i got 100% !! :3
Answer: I just added this so you can give the other person brainly
Help out please????
Answer:
B. X= Elements, Y= Compounds
Explanation:
An element is a substance that is made up of only one type of atom. The atoms of an element can combine together chemically to form a molecule but can still exist as an individual atom e.g. Hydrogen atom; H can form molecule H2. Since only one atom makes up an element, its electrons act independently.
Compounds, on the other hand, are substances that are made up of more than one type of atom chemically combined. A compound can only exist as a molecule because it always contains more than one atom bonded together. However, since more than one atom are involved in the chemical bond that holds them together, electrons are shared with other atoms. Example of a compound is H20 containing atoms of hydrogen and oxygen that are chemically combined.
why would a pregnant mother need more calcium than a woman her age that is not pregnant?
Besides building teeth and bones, calcium also keeps your blood and muscles moving and helps your nerves send messages from your brain to the rest of your body. Your body can't make calcium, so you need to get it from food or supplements. While you're pregnant, try to get at least 1,000 mg of calcium every day.
Calcium is a vital mineral. Your body uses it to build strong bones and teeth. calcium is also needed for your heart and other muscles to function properly
energy traveling as electromagnetic waves
Radiant
Thermal
Chemical
Mechanical
Give 2 Examples of gasses
Is carbon Dioxide matter????
Answer:Yes
Explanation: Matter is everything around you.
need help on 1-10. for chemistry
Answer:
guhhh
Explanation:
the substance that can not be further decomposed by ordinary chemical means is
A.water
B.gold
C.sugar
D.air
Neon is used in lighting advertising displays.
Which statement can be applied to an atom of neon?
A The atom has the same electron arrangement as Cl– ion.
B The atom has two more electrons than an atom of oxygen.
C The atom has the same number of outer electrons as an atom of helium.
D The atom has the same number of electrons as a Ca2+ ion.
Answer:
B. The atom has two more electrons than an atom of oxygen.
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 while neon has total number of ten (10) electrons. Therefore, an atom of oxygen 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 with an atomic number of 10.
This ultimately implies that, an [tex] O^{2-} [/tex] atom contains the same number of electrons as an atom of neon.
Hence, a neon atom has two more electrons than an atom of oxygen.
Additionally, Neon is used in lighting advertising displays.
Bones function as levers for the muscle to provide movement of the body. What refers to increasing the angle of the joint, thus moving two bones farther apart?
A) Abduction
B) Adduction
C) extension
D) flexion
Answer:
It would be B
Explanation:
Calculate the number of nitrogen atoms in 20.9 grams of nitrogen.
Answer:
N=5.47×10^23
Explanation:
n=
[tex]n = \frac{m }{ar} [/tex]
N=n×la
What is the name of Br6F10 ?
Answer:
isopropyl alcohol
Explanation:
HOPE IT HELPS YOU
2 points
2.7 x 10-2 grams of Pb(C2H302)4 are dissolved to make 3.5 mL of
solution. What is the molarity?
Your Answer
Answer:
The molarity is 0.0174 [tex]\frac{moles}{liter}[/tex]
Explanation:
Molarity (M) or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution.
[tex]Molarity=\frac{number of moles of solute}{volume of solution}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
In this case, being the molar mass of compound Pb(C₂H₃O₂)₄ equal to 443.38 g / mol, then the following rule of three can be applied: if 443.38 grams are contained in 1 mol, 2.7*10⁻² grams in how many moles they are present?
[tex]amount of moles=\frac{2.7*10^{-2} grams*1 mol}{443.38 grams}[/tex]
amount of moles= 6.09*10⁻⁵ moles
Being 1,000 mL= 1 L, then 3.5 mL= 3.5*10⁻³ L
So:
[tex]Molarity=\frac{6.09*10^{-5} moles}{3.5*10^{-3} L}[/tex]
Solving:
Molarity=0.0174 [tex]\frac{moles}{liter}[/tex]
The molarity is 0.0174 [tex]\frac{moles}{liter}[/tex]
explain why temperature is not as hot during the summer when a city is on a body of water (for example San Diego vs. Imperial Valley).
Answer:
because the water brings a cool breeze when the wind blows
Explanation:
Draw a model to represent the physical property of metals known as ductility, or the ability to be drawn into a wire.
The model that represents the physical property of metals known as ductility can be seen in the image attached below.
Metals are substances that are good conductors of heat and electricity.
The term ductility is a characteristic of metal and it explains the ability of metals to be drawn into wire. it implies that metal materials can be hammered and beaten into tiny sheets of wires.
The model in the image attached below shows how gold which is metal is drawn into wires.
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____33. When an atom undergoes gamma decay, the atomic number of the element
a. remains the same.
b. decreases by one.
c. increases by one.
d. increases by two.
____34. Radioactive materials change into new _______________ during radioactive decay.
a. compounds
b. atoms of the same material
c. elements
d. neutrons
____35. Nuclear fission is the:
a. Production of uranium.
b. Splitting of protons by bombarding them with neutrons.
c. Splitting of atoms by bombarding them with neutrons.
d. Result of neutrons smashing into each other.
____36. During fission:
a. Electrons are released and cause more fission.
b. Protons are released and cause more fission.
c. Uranium is produced.
d. Neutrons are released and cause more fission.
____37. Separating U-235 from U-238 was difficult because:
a. There was so much more U-235 than U-238
b. There was so much more U-238 than U-235.
c. A chain reaction would result.
d. They are chemically identical.
Part IV: True/False
____ 38. The mass of the nucleus is small compared to the mass of the atom.
____ 39. Alpha particles would be harder to turn than Beta particles.
____ 40. Positive charge was spread all throughout the atom in the Rutherford Model.
____ 41. The Manhattan Project was located in New York for most of its duration.
____ 42. The cathode rays produced by Thomson were identical for all filaments.
____ 43. It is possible to know where an electron is and what path it is on.
____ 44. X-rays are produced when fast moving electrons strike phosphor coatings.
Answer: Because only energy is emitted during gamma decay, the number of protons remains the same. Therefore, an atom does not become a different element during this type of decay. Q: The Figure below shows how helium-3 (He-3) decays by emitting a gamma particle.
Answer:
yes
Explanation:
33c 32 c 33d 34a 35 b 36a 37 d
4) Complete the following statement: Different elements...
A) Must have a mass number of at least 18.
B) Have more electrons than protons.
C) Have the same number of protons.
D) Have different numbers or protons.
ANSWER ASAP THIS IS 6TH GRADE SCIENCE! GIVING BRAINLIEST FIVE STARS ANS A HEART!
Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas. Radiation is the transfer of thermal energy through thermal emission.
Answer:
what are you supposed to answer???
Explanation: