Answer:
Explanation:
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Please help me, Thank you!
Answer:
2
Explanation:
The atom shown in the image has 2 core electrons.
Electrons are the negatively charged particles within an atom. Therefore the total number of electrons surrounding the nucleus in the given specie is 7.
So;
We have 2 core electrons
And 5 valence electrons
The core electrons are the inner orbital electrons.
The valence electrons are the outermost electrons.
what are the parts of a chemical change
Answer:
These include decomposition, synthesis, displacement, acid-base, combustion, oxidation-reduction, electrochemical
Answer:
Chemical Reaction Parts:
These include decomposition, synthesis, displacement, acid-base, combustion, oxidation-reduction, electrochemical, and myriad others.
Explanation:
Seven Things That Indicate a Chemical Change Is Occurring
Gas Bubbles Appear. Gas bubbles appear after a chemical reaction has occurred and the mixture becomes saturated with gas. ...
Formation of a Precipitate. ...
Color Change. ...
Temperature Change. ...
Production of Light. ...
Volume Change. ...
Change in Smell or Taste. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input.
A solution is saturated in CO2 gas and KNO3 at room temperature. What happens when the solution is warmed to 75°C?
solid KNO, precipitates out of the solution
gaseous CO2 bubbles out of the solution
solid KNO, precipitates out and gaseous CO2 bubbles out
nothing happens; both CO2 and KNO3 remain in solution
Answer:
gaseous CO2 bubbles out of the solution
Explanation:
We already know that the dissolution of a gas in water is exothermic. Hence, when the temperature of a solution containing a gas is increased, the solubility of the gas decreases and the gas bubbles out of the solution.
Similarly, the dissolution of KNO3 in water is endothermic. This implies that the solubility of the solid increases with increasing temperature.
Thus the solid becomes more soluble at 75°.
When the solution is warmed to 75°C ; ( B ) gaseous CO₂ bubbles out of the solution
When a solution is saturated with CO₂ ( gas ) and KNO₃ ( s ) has its temperature increased above the room temperature to about 75°C the solubility of the gas CO₂ will decrease, because the solubility of gas in a solution decreases with an increase in temperature while the solubility of a solid increases with increase in temperature.
Since the solubility of the gas decreases the gas will escape as bubbles ( CO₂ bubbles ).
Hence we can conclude that When the solution is warmed to 75°C ; ( B ) gaseous CO₂ bubbles out of the solution.
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If a 10 kg stone falls from a height of
30 m, what is the velocity of the stone
as it hits the ground?
Answer:
26.32 because z easy
Explanation:
Answer:
26.32 because z easy
Explanation:fds
Answer:
26.32 becfdseefdause z easy
Explansefdsefdsefdsenfuystyegfsvfgvsfhs76ieu4fguyhgvrykes4rjehrfgehg4fuebecause z easy
Explanasetion:sf
26.32 because z easy ef
Explanation:
Answer:ds
26.32 because z easy
Explanation:
hbdshfiushyAnswer:
26.32 because z easy
Explanation:
Answer:
26.32 because z easy
Explanation:fds
Answer:
26.32 becfdseefdause z easy
Explansefdsefdsefdsenfuystyegfsvfgvsfhs76ieu4fguyhgvrykes4rjehrfgehg4fuebecause z easy
Explanasetion:sf
26.32 because z easy ef
Explanation:
Answer:ds
26.32 because z easy
Explanation:
hbdshfiushy
2. Which pair of elements would have the greatest difference in electronegativities? *
Answer:a
Explanation:
Using the expression Ka=[H+][A−][HA] , explain how to determine which solution has the lower pH , 0.10MHF(aq) or 0.10MHC2H3O2(aq) . Do not perform any numerical calculations.
Answer:
0.10MHF(aq)
Explanation:
Given that:
[tex]K_a = \dfrac{[H^+][A^-]}{HA}[/tex] , to find the solution with a lower pH between 0.10MHF(aq) or 0.10MHC2H3O2(aq).
Recall that:
The higher the Ka value, the higher the ionization, hence more formation of protons in the solution. Also, higher H⁺ in solution results in a lower pH value.
Since HF have a higher Ka value, then HF solution will have a lower pH.
The acidity and alkalinity measure of a substance based on hydroxyl or hydrogen ion released is called pH. It is measured based on the pH scale that tells about the acidity and basicity of the substance.
0.10 M [tex]\rm HF[/tex] (aq) has lower pH.
The pH can be explained as:The acid dissociation constant ([tex]\rm K_{a}[/tex]) is given by,
[tex]\rm K_{a} = \dfrac{[H^{+}][A^{-}]}{[HA]}[/tex]
The value [tex]\rm K_{a}[/tex] of can be used for determining the lower and higher pH.When the [tex]\rm K_{a}[/tex] value is high then the ionization of the substance will be higher resulting in the release of more protons in the solution.When [tex]\rm H^{+}[/tex] is high then the pH will be lower and the solution will be more acidic.The [tex]\rm K_{a}[/tex] value of [tex]\rm HF[/tex] is more compared to the [tex]\rm HC_{2}H_{3}O_{2}[/tex] resulting in lower pH and more acidity.Therefore, 0.10 M [tex]\rm HF[/tex] (aq) has lower pH.
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What are all the elements in a column called? NO LOOKING IT UP and if u do put it in ur words
Answer:
There have been seven horizontal rows of elements are called phases in the periodic table of elements. Groups, or families, are called vertical columns of elements. Metals, – anti, and metals are the most common ways of classifying the periodic table.
Explanation:
Which of the elements has the same Lewis dot structure as calcium (Ca)?
A.Barium (Ba)
B.Potassium (K)
C.Germanium (Ge)
D.Argon (Ar)
Answer:
[tex]\boxed {\boxed {\sf A. \ Barium (Ba)}}[/tex]
Explanation:
Lewis dot structures illustrate the valence electrons in an element.
Valence electrons are the outermost electrons in an atom that bond with other atoms by accepting or releasing electrons. The groups, or columns, of the Periodic Table have the same number of valence electrons.Calcium is in group 2.
The other elements in this group are:
Beryllium, Magnesium, Strontium, Barium, and RadiumSo, all these elements have the same lewis dot structures because they have the same number of valence electrons.
Based on the answer choices, choice A is correct.
How might the information on melting point, boiling point, and flammability be useful to materials scientists
The information on melting point, boiling point, and flammability might be useful to materials scientists as:
What is Melting point?The temperature for the pure substance at which the liquid and solid phase exist in equilibrium condition
What is Boiling point?The temperature at which the vapour pressure of the liquid is equal to the atmospheric pressure.
What is flammability?Flammability is the ability of a substance such as solid, liquid and gases to ignite in air if source of ignition is applied.
Material scientist apply the knowledge of physical and chemical properties of different compounds to synthesize new product or improve existing ones.
Hence to know the knowledge about melting point, boiling point, flammability might be necessary conditions for material scientist.
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Which of the following is not a unit of volume? (A) L (B) mL (C) m3 (D) cm2
HELP PLS IT DUE TODAY!!!!!
Answer: Choice D) cm^2
This is the same as saying "square cm". This is a unit of area, and not a unit of volume. Consider a 1 cm by 1 cm square. It's area is 1 square cm. As another example: a rectangle with sides 7 cm by 14 cm has area 14*7 = 98 cm^2.
Much like how 5*5 = 5^2, we apply this idea to the units which is why cm*cm = cm^2.
The ability of iron to conduct electricity is a physical property of iron. *
True
False
Answer:
True
Explanation:
A physical property is a property that can be measured without changing the chemical composition of the substance.
The chemical composition of iron does not change when it conducts electricity so conductivity is a physical property.
Hope that helps.
Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, the given statement is true.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.
A physical property is a property that can be measured without changing the chemical composition of the substance. So, ability of iron to conduct electricity is a physical property of iron
Therefore, the given statement is true.
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When an electron moves from a lower energy level to a higher energy level, the atom:
A. absorbs light
B. gives off light
C. becomes a new isotope
Answer:
A. absorbs light
Explanation:
For an electron to move from a lower energy level to a higher energy level, energy needs to be added to the atom.
In most cases this required energy will be light: The electron of the atom will absorb the energy of the light and move to a higher energy level.
When said electron comes back to the lower energy level, the atom will conversely give off light.
Which of the following is a necessary product of a combustion reaction?
A. A precipitate
B. Heat
C. A hydrocarbon
D. Oxygen
Answer:
B. Heat
Have a nice day everyone!
To solve such this we must know the concept of combustion reaction. Therefore, heat is a necessary product of a combustion reaction. The correct option is option B.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Combustion reaction is a reaction in which a substance, basically hydrocarbons burns in presence of oxygen to produce carbon dioxide and water and heat in huge amount.
Therefore, heat is a necessary product of a combustion reaction. The correct option is option B.
Learn more about the chemical reactions, here:
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I need help please help me !
Answer:
the rust formed because of the water sitting in sied a metal bowl for long time but they can fix this if they get filters
Explanation:
hi someone help me pls
Answer:
c
Explanation:
chemical change results from a chemical reaction where nothing is change example of chemical changes burning, cooking, rotting and rusting
Answer:
IM LOOKING FOR POINTSSSSS
Explanation:
PLS HELP
S
S
S
S
S
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How many moles are in 3.63 x 1023 atoms of Mn?
Answer:
0.603 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.63 \times {10}^{23} }{ 6.02 \times {10}^{23} } = \frac{3.63}{6.02} \\ = 0.60299...[/tex]
We have the final answer as
0.603 molesHope this helps you
A chef is cooking with a 2000-gram stainless steel skillet. Stainless steel has a specific heat capacity of 0.450 J/(g *oC). How much heat energy is required to raise the temperature of the skillet from 25oC to 125oC?
Group of answer choices
44,000 Joules
90,000 Joules
22,500 Joules
855 Joule
Answer:
Q = 90,000 J
Explanation:
Given data:
Mass skillet = 2000 g
Specific heat capacity = 0.450 J/g.°C
Energy required to raise temperature = ?
Initial temperature = 25°C
Final temperature = 125°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 125°C - 25°C
ΔT = 100°C
Q = 2000 g × 0.450 J/g.°C × 100°C
Q = 90,000 J
13. Think about the noble gases.... *
Answer:
Its C - He
Explanation:
An ionic bond is a bond that forms between
A. ions with opposite charges
B. atoms with neutral charges
C. one atom's nucleus and another atom's electrons
D. the electrons of two different atoms
Answer:
A. ions with opposite charges
Explanation:
Ionic bond, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.
what is the mass of of 3.20 X 10^23 particles of Co2?
Answer:
Mass = 23.36 g
Explanation:
Given data:
Number of particles of CO₂ = 3.20 ×10²³
Mass of CO₂ = ?
Solution:
1 mole contain 6.022×`10²³ particles,
3.20 ×10²³ particles × 1 mol / 6.022×`10²³ particles
0.531 mol
Mass of CO₂:
Mass = number of moles × molar mass
Molar mass = 44 g/mol
Mass = 0.531 mol× 44 g/mol
Mass = 23.36 g
The photo shows a frozen juice pop on a hot day.
Which detail could be added to the photo to model the thermal energy
transfer that is taking place?
A. Arrows pointing from the juice pop to the sun
B. Arrows pointing from the persons hand to the juice pop
C. Circles with arrows on the top of the juice pop
D. Arrows pointing from the sun to the juice pop
Answer:
C! Hope this helps !:)
Explanation:
Answer:
Arrows pointing from the sun to the juice pop
Explanation: Trust I got it right
What shapes do s, p, d represent?
In addition or subtraction, the result carries the same number of decimal places as the quantity carryi
the fewest decimal places.
How many moles of oxygen are required to produce 12 moles of water?
Answer:
6 moles of Oxygen required
Answer:
6
Explanation:
I hope this helps with your question :)
What is the percent abundance of Pt-196, if the average atomic mass of platinum is 195.16 and platinum has only four naturally
occurring isotopes?
A)
8%
B)
25%
33%
D)
50%
The answer is 25%
Which is true of scientific questions?
A. Few scientific questions lead to useful investigations.
B. Scientific questions are answered by doing experiments.
C. Many scientific questions are too complex to be tested.
D. Scientific questions are biased by the opinions of scientists.
BRAINLIEST !!! HELP PLZ
Answer:
Hcl Answer
Explanation:
may be this helpful!
During ________________________, a new nuclear membrane forms around eachgroup of chromosomes.
Answer:
Telophase
Explanation:
I looked up the ending lol!hope this helps
Which describes a similarity between abiotic and biotic Which describes a similarity between abiotic and biotic factors?
A.They may include things that were once living.
B.They are both necessary for organisms to survive.
C.They are not usually important parts of the environment.
D.They can be easily replaced if they are used or destroyed.factors?
option A is correct.biotic is a nother word for living
Answer:
option A would be the correct answer for the question below.
Explanation:
Which describes a similarity between abiotic and biotic factors?
What is oxydation number of s for H2S ? ( hydrogen sulphide )
Answer:
the oxidation number is zero because H=+1. S=-2
Explanation:
so two hydrogen and one sulphur so total no is zero
