Answer:
the moon gets infront of the sun
Answer:
A solar eclipse happens when the moon moves in front of the Sun as seen from a location on Earth. During a solar eclipse, it gets dimer and dimmer outside as more and more of the Sun is covered by the Moon. During a total eclipse, the entire Sun is covered for a few minutes and it becomes very dark outside. The temperature outside also drops.
Which symbol in a chemical equation separates the reactants from the products?
Answer:
The arrow symbol in a chemical equation separates the reactants from products. A chemical reaction is process in which chemical changes leads to the formation of products from reactants.
Explanation:
Which of the following most likely causes the rate of a chemical reaction to increase?
Answer:
Adding heat to the reaction or increasing pressure
Explanation:
Increasing temperature or pressure will result in chemical reaction rates to speed up.
A procedure involving removal of the coronal portion of an exposed vital pulp is a
Answer:
ExplanaPulpotomy is a vital pulp therapy in which the coronal portion of the pulp is removed surgically and the remaining radicular pulp is preserved intact. Over the remaining radicular pulp tissue, a suitable material is placed which has the potential to protect the pulp from further insult and initiate healing and repairtion:
Answer:
preserve of the vitality of the remaining portion of the pulp within the root of the tooth. Also referred to as root canal therapy
Explanation:
Sonar uses ____________ waves to tell how ____________things are in the water.
If we combine the reaction of an acid protonating water and the reaction of its conjugate base deprotonating water, the net reaction after canceling common terms is:______
a. The acid-base reaction between the acid and its conjugate base.
b. The synthesis of a complex between the acid and its conjugate base.
c. The autoionization of water
d. None of the above
Answer:
C
Explanation:
The net reaction after canceling common terms should be considered as the autoionization of water.
What is autoionization of water?Since acids and bases should be react with each other, this shows that water could be react with itself. Here the sound should be stranged. Also, the water molecules should be exchanged the protons to the small extent.
hence, The net reaction after canceling common terms should be considered as the autoionization of water.
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Mechanical Energy
At what point on the rollercoaster is
the kinetic energy the highest?
A. point A
B. point B
C. point C
D. cannot be determined
with the information provided.
Answer:
Point C
Explanation:
Remember that kinetic energy is energy a object has when it's in motion so the higher the speed, the higher the kinetic energy is. In this case we have a roller coaster, as the roller coaster goes up the tracks it's kinetic energy is low because it slows down as it climbs to the top of the hill. Then as it sits on top of the hill it's kinetic energy is little to none before it goes down the hill because the roller coaster isn't in motion. As when the roller coaster goes down the hill it's speed increases meaning the kinetic energy increases which means option C or "point C" is your answer.
Hope this helps.
The ion formed by an atom of sulfur when it gains two electrons is called a:
Do not answer cation or anion
Answer:
sulfide ion
Explanation:
however, when non-metalic elements gain electrons to form anions the end of their name is change to "-ide".foe example, a flourin atom gains one electronto become a flouride ion(F`) and sulfur gains two electrons to become a sulfide ion(s^2)
Which fossil fuel is made when plants from swamps are covered, pressed, and heated for millions of years? A Coal B Petroleum C Natural Gas D Nuclear
Answer:
A: COAL
Explanation:
Coal was created hundreds of millions years ago. When prehistoric plant life died and sank to the bottom of the swamp and was covered by layers of sediment.
Sodium is a soft metal with a relatively low work function. Light corresponding to 476 kJmol−1 was shone on the sodium metal, and the electrons detected had a velocity of 9.57×105ms−1. What is the work function of sodium metal based on this data? The mass of an electron is 9.11×10−31kg.
Based on the data given, the work function of sodium metal is equal to [tex]7.91 \times 10^{-19}\;Joules[/tex].
Given the following data:
Mass of an electron = [tex]9.11\times10^{-31}\;kg[/tex].Photo electric work function = 476 kJ/mol.Velocity of electrons = [tex]9.57\times10^{5}\;m/s[/tex]Avogadro constant = [tex]6.02 \times 10^{23}[/tex]
To determine the work function of sodium metal based on this data:
Mathematically, the photoelectric effect is given by the formula:
[tex]K.E = hf - BE_i[/tex]
Where:
K.E represents the maximum kinetic energy of the ejected electron.f is photon frequency.h is Planck constant ([tex]6.626 \times 10^{-34}\;J.s[/tex]).[tex]BE_i[/tex] is the work function of the material.However, since we were given the photo electric work function of light that was shone on the sodium metal, we would calculate the work function of sodium metal as follows:
[tex]\phi = \frac{Photo \;electric\; work \;function}{Avoadro's\;number}[/tex]
[tex]\phi = \frac{476 \times 10^3}{6.02 \times 10^{23}} \\\\\phi = 7.91 \times 10^{-19}\;Joules[/tex]
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Which of these observations are not explained by kinetic-molecular theory?
X When a gas is heated, it expands.
o At very low temperatures, gases expand less for a given pressure change than they do at high
temperatures.
If the volume of a gas decreases, its pressure increases at constant temperature,
When gas is added to a rigid container, the pressure inside the container increases
RETRY
Intra
Answer: At very low temperatures, gases expand less for a given pressure change than they do at high temperatures.
Explanation:
Answer:
above me is righttttttt
each substance in a solution mixture is visible to the naked eye? True or False
Just enough 0.500 M HCl is added to 30.0 mL of 2.5 M NH3 to reach the equivalence point. The Kb of NH3 = 1.8 X 10-5
Write the balanced equation for this reaction.
What volume of 0.500 M HCl solution was added?
What is the molarity of the salt produced from the neutralization reaction?
What is the pH of the solution at the equivalence point?
a.NH₃+HCl⇒NH₄Cl
b.volume HCl=150 ml
c. pH=4.82
Further explanationReaction
NH₃+HCl⇒NH₄Cl
The equivalence point⇒mol NH₃=HCl
Titration formula :
M₁V₁n₁=M₂V₂n₂(n=acid base valence, NH₃=HCl=1)
mol NH₃
[tex]\tt 2.5\times 30=75~mlmol[/tex]
mol HCl=75 mlmol
Volume HCl :[tex]\tt \dfrac{75}{0.5}=150~ml[/tex]
Volume total :
[tex]\tt 150+30=180~ml[/tex]
molarity of salt(NH₄Cl)mol NH₄Cl=mol NH₃=75 mlmol=0.075 mol
[tex]\tt M=\dfrac{0.075}{0.180}= 0.42[/tex]
pH of solutionDissociation of NH₄Cl at water to find [H₃O⁺]
[tex]\tt NH_4+H_2O\rightarrow NH_3+H_3O^+[/tex]
ICE at equilibrium :
0.41-x x x
Ka(Kw:Kb)= 10⁻¹⁴ : 1.8.10⁻⁵=5.6.10⁻¹⁰
[tex]\tt Ka=\dfrac{NH_3.H_3O}{NH_4}=\dfrac{x^2}{0.41}[/tex]
[H₃O⁺]=x :
[tex]\tt \sqrt{5.6.10^{-10}\times 0.41}=1.515.10^{-5}[/tex]
pH=-log[H₃O⁺]
[tex]\tt pH=5-log~1.515=4.82[/tex]
208
11- Predict the basicity of H2SO4 in the following reaction.
NaOH + H2SO4 – NaHSO4 + H20
Answer:
1
Explanation:
1 hydrogen is displaced from H2so4 in the reaction
Draw the Lewis structure with the lowest formal charges for ClF2+ . Include nonzero formal charges and lone pair electrons in the structure.
Answer:
See explanation
Explanation:
The formal charge is obtained from;
Formal Charge = Valence electrons on atom - [number of bonds - lone pair electrons]
The correct structure of ClF2+ is the structure attached to this answer (image obtained from quora) in which the formal charge on fluorine is zero and the formal charge on chlorine is + 1. This is the correct structure because the chlorine is more electronegative than fluorine as expected.
The Lewis structure is a representation that shows electrons' distribution around each of the atoms composing a molecule. In the attached files you will find the Lewis structure for ClF2+.
----------------------
The Lewis structure is a representation that shows electron pairs in bonds between the atoms that compose the molecule. It also shows the solitary electron pairs that remain for each atom.
Structure
There is always a central atom and terminal atoms.
The central atom is surrounded by the terminal ones.
The central atom forms many bonds with terminal atoms.
When the molecule is composed of many atoms of the same element and a single atom of a different element, this last one is the central atom, and the others are terminal ones.
Usually, hydrogen and oxygen atoms are terminal, and carbon atoms are central.
Usually, the electropositive atoms are central, while the electronegative atoms are terminal.
Bonds
Bonds between atoms might be represented either as points or using a line. Two points equal a single line.
A pair of electrons represent one single bond.
Electrons pairs that are not involved in the bond are placed around the belonging atom.
Electrons
When adding the valence electrons of each atom we get the total number of electrons in the molecule.
The valence value is the number of electrons placed in the last energetic level of the atom.
When drawing the Lewis structure of an ion, the entire structure is between square brackets, and the charge is written as an exponent in the upper right corner, outside the brackets.
So let us analyze the exposed example, ClF2+
1) Cl and F have 6 electron pairs and a single one. 7 electrons in total each.
2) Since there are two F and one Cl, then Cl is the central atom and F are the terminal ones.
3) Valence electrons: 7e⁻ F + 7e⁻ F + 7e⁻ Cl = 21 electrons
Since the ion has a possitive charge, there are 20 electrons.
4) Electron pairs:
Each F needs to form bonds with Cl. Each bond requires two electrons.
Since there are two bonds, four electrons are required.
The 16 remaining electrons must be placed as 8 solitary pairs. Each atom needs a maximum of 8 electrons.
Each F will get 3 pairs maximum to get the 8 e⁻.Cl will get 2 pairs to get the 8 e⁻.
5) The ion is between brackets, and the charge is written as an exponent in the upper right corner.
You will find the image in the attached files.
-----------------------
You can learn more about the Lewis structure
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Is this chemical equation balanced? yes or no
Mg + 2O ---> 2MgO
Answer:
yes
Explanation:
So the balanced equation is 2 Mg + O 2 2 MgO.. ... Example: 2Mg + O2 -> 2MgO Magnesium and oxygen combine to form the compound magnesium oxide.
Thus, to balance the O2 we put a 2 in front of the MgO. However, now there are 2 Mg's in the products and only one Mg in the reactants. To balance the Mg we then put a 2 in front of the Mg in the reactant. All atoms are now balanced in the reaction
Answer:
Yes.
Explanation:
Oxygen has 2 atoms, and so does Magnesium.
Hope this helped! Have a good night!
What is the reason for the trend in Electron Affinity? Select all that apply.
A. number of protons in the nucleus
B. number of energy levels around the nucleus C. number of neutrons in the nucleus
D. larger atomic mass number
E. number of valence electrons.
Answer:
i think it a and d
Explanation:
Which is an advantage of using gymnosperms as decorative outdoor plants around homes and businesses?
Most of them do not grow very tall.
Most of them stay green all year.
All of them produce colorful flowers,
All of them have sharp needle-like leaves.
Answer:
i just took the test the correct answer is "most of them stay green all year"
Explanation:
Answer:
its B :)
Explanation:
cuz im mr beast
a single covalent bond is made up of
Answer:
In chemistry, a single bond is a chemical bond between two atoms involving two valence electrons. That is, the atoms share one pair of electrons where the bond forms. Therefore, a single bond is a type of covalent bond.
Explanation:
(copied from Google)
If 19.2 grams of O2 reacts with iron to form iron oxide how much iron was used in the reaction? use the equation 4Fe + 3O2 — 2Fe2O3 to help
Answer:
44.8g
Explanation:
The reaction equation is given as:
4Fe + 3O₂ → 2Fe₂O₃
Given:
Mass of O₂ = 19.2g
Unknown:
Amount of iron used =?
Solution:
To solve this problem, we adopt the mole concept.
Since we know the mass of O₂;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of O₂ = 2(16) = 32g/mol
Number of moles = [tex]\frac{19.2}{32}[/tex] = 0.6moles
From the balanced reaction equation;
4 moles of Fe will react with 3 moles of O₂
0.6moles of O₂ will react with [tex]\frac{0.6 x 4}{3}[/tex] = 0.8mole of Fe
Mass of Fe = number of moles x molar mass
= 0.8 x 56
= 44.8g
An object with the mass of 2300 g has a force of 6.2 Newton's applied to it. What is the resulting acceleration of the object?
Answer:
[tex]\boxed {\boxed {\sf a\approx 2.7 \ m/s^2}}[/tex]
Explanation:
Force is equal to mass times acceleration.
[tex]F=m*a[/tex]
By dividing both sides by m, we rearrange the formula for a (acceleration).
[tex]\frac{F}{m} =a[/tex]
The force is 6.2 Newtons, but we can convert the units to make the problem easier later on.
A Newton is equal to 1 kg*m/s², so 6.2 N is equal to 6.2 kg*m/s².The mass is 2300 grams, but we need to convert it to kilograms.
To convert grams to kilograms, divide by 1,0002300 g/1000= 2.3 kg[tex]F= 6.2 \ kg*m/s^2\\m=2.3 \ kg[/tex]
Substitute the values into the formula.
[tex]a=\frac{6.2 \ kg*m/s^2}{2.3 \ kg}[/tex]
Divide. Note that the kilograms or "kg" will cancel each other out (this is why we converted the units).
[tex]a=\frac{6.2 \ m/s^2}{2.3 \ }[/tex]
[tex]a=2.69565217 \ m/s^2[/tex]
Round to the nearest tenth. The 9 in the hundredth place tells us to round up to 2.7
[tex]a\approx 2.7 \ m/s^2[/tex]
The acceleration is about 2.7 meters per second squared.
the number of elements in 2CH4
Answer:mnedd kfj
Explanation:
fr rb r
Which are the products in the equation CH3SH + 4O2 → CO2 + SO2 +2H2O? Check all that apply. CH3SH O2 CO2 SO2 H2O
To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. Therefore, the products are carbon dioxide, sulfur dioxide and water.
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.
The other characteristic of balanced equation is that physical state should be written with each compound or molecule on reactant and product side. Physical state should be written in brackets. s means solid, l means liquid, g means gas.
The balanced equation is
CH[tex]_3[/tex]SH + 4O[tex]_2[/tex] → CO[tex]_2[/tex] + SO[tex]_2[/tex] +2H[tex]_2[/tex]O
The products that are formed in the given reaction are carbon dioxide, sulfur dioxide and water.
Therefore, the products are carbon dioxide, sulfur dioxide and water.
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show is a pedigree chart. the chart shows that sally is carrier for red-green color blindness
Answer:
you cant post pictures on brainly answers.... can you?
Explanation:
a solution is made by dissolving 25g of nacl in 300g of water. What is the mass percentage
Answer:
0.83 bar
That is
23/300*100
=0.83 bar
Calculate the mass of butane needed to produce 60.6 g of carbon dioxide.
Answer:
You take the mass of carbon dioxide, 56.8g, divide by its molar mass, 44.01g/mol, to produce the moles of carbon dioxide. This is multiplied by the molar ratio of butane/CO2, (2/8) = 1/4, which gives the moles of butane required to produce the carbon dioxide.
Explanation:
go to google
What neutral element will have the electron configuration 1s22s22p63s23p1?
Select one:
a. aluminum
b. boron
c. carbon
d. silicon
Answer:
a. aluminum
Explanation:
Given electronic configuration:
1s² 2s² 2p⁶ 3s² 3p¹
The number of electrons can be determined from adding the powers or superscripts.
Since we are dealing with a neutral element, the number of electrons and protons are the same. So we can determine the atomic number which is the number of protons.
Number of electrons = 2 + 2 + 6 + 2 + 1 = 13
The element with atomic number 13 is aluminum.
The given electronic configuration adds up to 13 which is the atomic number of aluminium.Thus, the correct option is A.
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable. Aluminium has the given electronic configuration.
Thus, the correct option is A.
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When elements bond together or when bonds of compounds are broken and form a new substance
A. Fireworks
B. Chemical Reaction
C. Chemical Change
D. Energy
Which of the following is extrusive? A. Lava. B. Magma. C. Laccolith. D. Batholith.
Answer:
I think its C if I'm wrong plz forgive me
Answer:
the other answer is incorrect
Explanation:
If I start with 0.0350 L of a 12.0 M hydrochloric acid solution, and dilute it with water to a new volume of 1.20 L, what is the new concentration?
Answer:
0.35 M
Explanation:
Using the formula; C1V1 = C2V2
Where;
C1 = concentration of initial solution
C2 = concentration of final solution
V1 = volume of initial solution
V2 = volume of final solution
Based on this question, I start with 0.0350 L of a 12.0 M hydrochloric acid solution, and dilute it with water to a new volume of 1.20 L. This means that:
C1 = 12.0 M, V1 = 0.0350 L, V2 = 1.20 L, C2 = ?
Hence, C1V1 = C2V2
12 × 0.0350 = C2 × 1.20
0.42 = 1.2C2
C2 = 0.42/1.2
C2 = 0.35 M
How does the wind pattern during the day compare with the wind pattern at night?