Answer:
By putting the rice in water
Explanation:
Which of the following pictures correctly shows the structure of hydronium ion?
Answer: The first picture
Explanation:
The structure of hydronium ion is correctly represented in the first structure where there are three hydrogen atoms and one oxygen atom.
What is an ion?An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each other resulting in the formation of ionic bond.
Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.
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1. Calculate the amount of energy absorbed when 10 g water at 86 C turns completely to steam vapor at 100C
2. Calculate the amount of energy released when 10 g water at 72 C freezes completely at 0C
Answer:
The amount of energy absorbed when 10 g water at 86 C turns completely to steam vapor at 100 C is 584.76 J
The amount of energy released when 10 g water at 72 C freezes completely at 0 C is 3,012.48 J
Explanation:
Sensible heat is the amount of heat that a body can receive without affecting its molecular structure. If the molecular structure does not change, the state (solid, liquid, gas) does not change. Since the molecular structure does not change, a change in temperature is observed.
In other words, the heat that produces a change in the temperature of a substance without any changes in its physical state (phase change) is called sensible heat.
The equation that allows calculating this type of heat exchange is:
Q = c * m * ΔT
where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the change in temperature.
1. In this case, you know:
c= 4.184 [tex]\frac{J}{C*g}[/tex]m= 10 grΔT=Tfinal - Tinitial= 100 C- 86 C=14 CReplacing:
Q= 4.184 [tex]\frac{J}{C*g}[/tex] *10 g*14 C
Solving:
Q= 584.76 J
The amount of energy absorbed when 10 g water at 86 C turns completely to steam vapor at 100 C is 584.76 J
2. In this case, you know:
c= 4.184 [tex]\frac{J}{C*g}[/tex]m= 10 grΔT=Tfinal - Tinitial= 0 C- 72 C= -72 CReplacing:
Q= 4.184 [tex]\frac{J}{C*g}[/tex] *10 g*(-72) C
Solving:
Q= -3,012.48 J
The amount of energy released when 10 g water at 72 C freezes completely at 0 C is 3,012.48 J
How many total atoms are in the formula 2H2SO4
Answer:
In 2H2SO4, the number of hydrogen atoms is (1,2,4,8) the number of sulfur atoms is (1,2,4,8) and the number of oxygen atoms is (1,2,4,8)
Explanation:
I've done this problem before, but I did it a month or so back so I'm not 100% sure but I'm pretty sure this is the correct answer. Hope this helps!
Answer:2 hydrogen atoms 1 sulfur atom 4 oxygen atom
hope I helped!
Make a claim describing the relationship between Force and distance.
Answer:
A force is described as any influence that causes an object to undergo a change. Distance refers to how far an object travels over a period of time. The greater the force that is applied on an object the further distance that object will travel.
I need help with this, I'm not understanding.
Answer:
C. 5 grams
Explanation:
The ratio is 2:1, which means everything on the right (B) will be half of the left (A). Since 10 is on the left, and half of 10 is 5, C is the answer
What do you look for when trying to identify a formula and/or compound name as ionic?
Answer:
Ionic compounds are named with the cation first and the anion last. The same convention is used when writing their chemical formulas.
Explanation:
TIME FOR SOME MORE STUPID QUESTIONSSSSS lol
What color is glass o.o
Answer:
ORANGE WAIT NO IM COLOR BLIND
Explanation:
With some manipulation, the Rydberg equation can be rewritten in the form
E=constant×(1nf2−1ni2)
which allows you to calculate the energy of the emitted light. Express this constant in terms of the constants h, c, and RH using relationships between wavelength and energy as well as the Rydberg equation from the introduction.
Express the constant in terms of h and c, and RH.
Please help me with this question?
Answer:
attached below is the detailed solution
answer : value of constant = 2.18 * 10^-18 J
Explanation:
Express the constant in terms of h and c and RH
attached below is the detailed solution
Constant = [tex]h_{C} R_{H}[/tex]
= ( 6.626 * 10^-34 ) * ( 3 * 10^8 ) * ( 1.097 * 10^7 )
= 2.18 * 10^-18 J
The Planck equation and the light speed allow us to find the results for the transformation of the Rydberg equation are:
[tex]E = A ( \frac{1}{n_1^2}\frac{x}{y} - \frac{1}{n_2^2} )\\A= R_H \ h \ c \\A = 2.18 \ 10^{-18} j[/tex]
The Rydberg equation is an empirical expression that explains the wavelength of the emissions.
[tex]\frac{1}{\lambda } = R_H ( \frac{1}{n_1^2} - \frac{1}{n_2^2} )[/tex]
Where λ is the wavelength of the emitted radiation, is the Rydberg constant, n₁ and n₂ are integers with n₁ <n₂
It is asked to write the Rydberg equation for the energy.
Let's use the Planck relation.
E = h f
The light speed is related to the wavelength and frequency of radiation.
c = λ f
Where E is the energy, h the Planck constant, c the speed of light, λ the wavelength and f the frequency.
Let's substitute.
E = [tex]\frac{hc}{\lambda}[/tex]
[tex]\frac{1}{\lambda} = \frac{E}{hc}[/tex]
Let's substitute in the Rydberg equation.
[tex]\frac{E}{hc} = R_H ( \frac{1}{n_1^2} - \frac{1}{n_2^2}) \\E = R_H \ h \ c \ ( \frac{1}{n_1^2} - \frac{1}{n_2^2} )[/tex]
We can write is an constant of the form.
A = [tex]R_H h c[/tex]
The value of the constant is :
A = 1,097 10⁷ 6,626 10⁻³⁴ 3 10⁸
A = 2.18 10⁻¹⁸ J
In conclusion, using the Planck equation and the light speed we can find the results for the transformation of the Rydberg equation are
[tex]E = A ( \frac{1}{n_1^2} - \frac{1}{n_2^2} )\\ A = R_H h c\\[/tex]
A = 2.18 10⁻¹⁸ J
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What are examples of evaporation?
Answer:
Boiling water
Explanation:
The water evaporates from the pot
Answer:
Drying Clothes under The SunWet FloorsDrying of Wet HairWater from the Ocean getting evaporatedWhen you get out of the shower, the water on your body evaporates as you dry. If you leave a glass of water out, the water level will slowly decrease as the water evaporates.Sweating
What element would have this electron configuration:
1s22s22p 3s 3p 4s 3d
Answer:
you need to put a choice if you want help add the possible answers
Explanation:
Once upon a time, I was traveling from Kaunas Lithuania to Klaipeda to see Egle, the queen of serpents. Being the queen of serpents, she has certain magical powers. In exchange for some sand, salt, and iron, she will grant my wish. I put all three things in my bottle together and traveled. During my travels, the salt, sand, and iron got mixed up. No big deal right? Wrong. Egle wants each thing separated before she will grant my wish.... Am I just out of luck completely?
Please write your response and explain your reasoning.
Answer:
No
Explanation:
Fortunately, in this scenario, you are not out of luck. Each of these components has a unique trait that would allow you to easily separate them. For starters, you can separate all of the Iron with a strong magnet since iron has a magnetic field while sand and salt do not. Next, you can separate the salt and sand by adding water since salt will dissolve in the water leaving only the sand which is not soluble. Once the sand is removed you would simply need to distill the water/salt mixture which would separate the salt from the water. Now you have all three components separated and can get your wish.
Describe the overall structure or order of the scientific process.
Answer:
Explanation:The scientific method is an empirical method of acquiring knowledge that has characterized the development of science since at least the 17th century. It involves careful observation, applying rigorous skepticism about what is observed, given that cognitive assumptions can distort how one interprets the observation. It involves formulating hypotheses, via induction, based on such observations; experimental and measurement-based testing of deductions drawn from the hypotheses; and refinement (or elimination) of the hypotheses based on the experimental findings. These are principles of the scientific method, as distinguished from a definitive series of steps applicable to all scientific enterprises.[1][2][3]
Though diverse models for the scientific method are available, there is in general a continuous process that includes observations about the natural world. People are naturally inquisitive, so they often come up with questions about things they see or hear, and they often develop ideas or hypotheses about why things are the way they are. The best hypotheses lead to predictions that can be tested in various ways. The most conclusive testing of hypotheses comes from reasoning based on carefully controlled experimental data. Depending on how well additional tests match the predictions, the original hypothesis may require refinement, alteration, expansion or even rejection. If a particular hypothesis becomes very well supported, a general theory may be develope
The number of shovels and cost per 1000 kg for
Ca(OH)2
Answer:500
Explanation:
Which option is an example of a chemical change?
A spreading peanut butter
B cutting bread
C digesting a sandwich
D stirring jelly
Answer:
Digesting a sandwich because it cant be reversed.
What is the pH of a solution that has the same number of hydrogen ions as hydroxide ions?
0
1
7
14
Answer:7
Explanation:
Answer:
its c
Explanation:
Pls help me here, thanks in advance
Answer:
What's the problem???
An intravenous solution contains 2.5 mEq/L of magnesium ions. How many moles of magnesium are in 750 mL of this solution?
Answer:
.9375 x 10⁻³ moles .
Explanation:
2.5 mEq / L of Magnesium ion
2.5 x 10⁻³ Eq / L
= 2.5 x 10⁻³ / 2 mole / L [ 1 mole = 2 Eq ]
= 1.25 x 10⁻³ mole / L
1 L contains 1.25 x 10⁻³ mole
750 mL = .75 x 1.25 x 10⁻³ mole
= .9375 x 10⁻³ mole .
So 750 mL contains .9375 x 10⁻³ moles .
Which of the following has a higher electronegativity oxygen or selenium?
Answer:
Between oxygen and selenium, oxygen is more electronegative because of more ionisation energy and small size
Explanation:
You are standing at position X. Choose the diagram that shows your position when you perceive a sound lower than the actual pitch of the siren.
Answer:
The answer is the second picture.
Explanation:
When you perceive a sound lower than its actual pitch, then you must have been further from the actual position.
What is pitch of a sound?
The pitch of a sound is a perceptual property of sounds that allows sound of similar frequencies to be distinguished.
Pitch is the quality of sound, that makes it possible to judge sounds as "higher" and "lower" in the sense associated with musical notes.
Thus, when you perceive a sound lower than its actual pitch, then you must have been further from the actual position.
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Which describes a homogeneous mixture?
A solvent dissolves in a solute to make a solution.
A solute dissolves in a solvent to make a solution.
A solution dissolves in a solute to make a solvent.
A solution dissolves in a solvent to make a solute.
Answer: ik im late but I got b
Explanation:
A homogeneous mixture can be described as the solute uniformly dissolving in a solvent to make a solution. Therefore, option (B) is correct.
What is a homogeneous mixture?A mixture can be described as a combination of two or more substances that are not chemically combined with each other. Mixtures can be categorized into two kinds homogeneous mixtures and heterogeneous mixtures.
A homogeneous mixture can be defined as one whose whole composition is uniform throughout the entire mixture. It can be the type of mixture where the entire composition is constant throughout that make up the mixture and is distributed uniformly.
A homogeneous mixture can be described as a gaseous, liquid, or solid mixture that has equal proportions of its components throughout the sample. In a homogeneous mixture, there is only one phase of matter observed.
Some examples of Homogeneous Mixtures are Air Rainwater, Vinegar, Dishwashing detergent, Steel, Sugar water, a Cup of Coffee, etc.
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Match each description to a type of radiation Drag each item to the appropriate bin.
Answer:
Explanation:
Beta radiations:
mass 1/200 , charge -1, medium penetration
Beta radiations are result from the beta decay in which electron is ejected.
The mass of beta particle is smaller than the alpha particles.
They can travel in air in few meter distance.
These radiations can penetrate into the human skin.
The sheet of aluminum is used to block the beta radiation
Properties of alpha radiation:
mass 4 amu, charge +2, least penetration
Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4 and atomic number less than 2 as compared to parent atom the starting atom.
Alpha radiations can travel in a short distance.
These radiations can not penetrate into the skin or clothes.
These radiations can be harmful for the human if these are inhaled.
These radiations can be stopped by a piece of paper.
Gamma radiations:
mass 0, charge 0, deepest penetration
Gamma radiations are high energy radiations having no mass.
These radiations are travel at the speed of light.
Gamma radiations can penetrate into the many materials.
These radiations are also used to treat the cancer.
Lead is used for the protection against gamma radiations because of its high molecular density.
The lead apron are used by the person when treated with gamma radiations.
is gasoline a heterogeneous mixture o
Distinguishing Between Pure Substances and Mixtures
Pure substances can be either elements or compounds. Mixtures can be either homogeneous or heterogeneous. ... Gasoline is thus a blend of different compounds, so it is a mixture.
Which of the following is a physical change ?
• burning a piece of paper
• lighting a match
• chopping a piece of wood
• a rusting nail
Chopping a piece of wood
Physical changes are changes affecting the form of a chemical substance but not it's chemical composition.
Answer:
rusting nail: Rusting would only be a physical change if iron molecules remained pure iron throughout the process. Yeah your correct a physical change is anything seen or felt like changing the temperature of water a chemical change can also be seen also like if a iron nail rusts the nails iron atoms were chemically changed by oxygen.
lighting a match: Breaking a match in two pieces is an example of a physical change. Lighting a match and letting is burn is an example of a chemical change. Chemical reactions cause chemical changes. In a chemical reaction two or more substances, called the reactants, form different substances called products.
burning a piece of paper: Burning of paper is not a physical change. It is chemical change as ash is formed in the process which is new compound and oxides of carbon are also released during the process. By the definition of chemical change, we come to know that during chemical change a new substance must form. These changes are irreversible in nature.
chopping a piece of wood: The chopping of wood is a physical change because as stated previously, any physical change can include cutting, bending, sharpening, etc. When a piece of wood is being cut, it undergoes one of these processes. The chopping of wood doesn't alter the chemical structure of the actual wood.
So Its chopping piece of wood!
Hope this helps!!identify the element in the following period and group period 2 and group 17
Answer: I looked at the periodic table and the element that lines up between the two is F which is Fluorine.
Explanation: I hope this helps!
The element in period 2 of group 17 is fluorine.
What is fluorine?
Fluorine is the most chemically reactive and electronegative of all the elements. It is a single-valent toxic gaseous halogen that is pale yellow-green in color. Even with the noble gases krypton, xenon, and radon, fluorine easily combines with the majority of other elements to generate new compounds.
Glass, metals, and even water, as well as other materials, burn with a brilliant flame in a jet of fluorine gas because it is so reactive. The fluoride ion F- is the most frequent form of fluorine in aqueous solutions. Fluorides are substances that contain fluoride along with a positively charged partner.
Fluorine is indirectly utilized in the manufacturing of uranium, low friction polymers like teflon, and halons like freon. Fluorochlorohydrocarbons are widely utilized in refrigeration and air conditioning.
Therefore, the name of the element is fluorine.
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The table below shows the average seasonal relative humidity during the summer in four locations:
Relative Humidity
Location Average Seasonal Relative Humidity (%)
A 76
B 81
C 60
D 98
Which location is most likely to experience frequent summertime storms?
Location A
Location B
Location C
Location D
Answer:
the answer is B
Explanation:
because its asking you the frequent summertime storms
hope it helps you
Answer:
b is your answer i'm sure of it :)
Explanation:
have great day :)
Choose the coefficient for blank 1 (in front of Rb)
___ Rb + ___ P --> ___ Rb3P
options:
3
1
4
2
Answer:
3
Explanation:
Step 1: RxN
Rb + P → Rb₃P
Step 2: Balance RxN
We will need 3 Rb's on both sides.
3Rb + P → Rb₃P
Which types of reactions would result in the formation of precipitate?
Answer:
Double Displacement Reaction
Explanation:
A double displacement reaction is a type of chemical reaction in which the reactant ions exchange places to form new products. Usually, a double displacement reaction results in precipitate formation.
Does changing the number of neutrons affect the atomic number?
Answer:
awsdxcvawsd
Explanation:
Answer:If you change the number of neutrons in an atom, you get an isotope of the same element. The addition of a neutron can make an atom radioactive. When you change the number of protons in an atom, you will change the atom from one element to a different element.
Explanation:
What type of heat transfer happens in the Outer Core?
Which has a higher electronegativity phosphorus or sodium
Answer:
sodium
Explanation: