Answer:
B
Explanation:
Because the atomic mass is the mass of a single atom of a chemical elements
substance in which two or more atoms are bonded together.
molecule(s)
two or more atoms touching means they are connected as molecules which also make up compounds
Which of the following elements will lose electrons to form an
ion? Check all that apply.
Р
Fe
Pb
Se
Elements that will loose electron as so that ion can be formed are; Fe and Pb.
Fe ( iron ) and Pb ( Lead) are both metals and metals will always loose electron so that they can turn to postively charged ion, and this ion is regarded as Cation.Phosphorus (P) is a non- metal, it will only gain electron and turn to a negatively charged ions, this ion is regarded as Anion.Therefore, Metals usually lose electron while non- metals accept the electron.
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Most of Earth's atmosphere is made up of nitrogen gas. Nitrogen can also
exist as a solid, liquid, or plasma. Four samples of nitrogen are each in a
different state but have the same mass. Which statement about the relative
amounts of thermal energy in the samples is true?
O A. The sample of solid has more energy than the sample of gas.
B. The sample of liquid has more energy than the sample of solid.
C. The sample of plasma has less energy than the sample of gas.
D. The sample of liquid has less energy than the sample of solid.
The sample of the liquid has more energy than the sample of solid. Hence, option B is correct.
What is thermal energy?Thermal energy refers to the energy contained within a system that is responsible for its temperature.
The particles in the liquid are the same as in the solid but they have more energy. To melt solid energy is required to overcome the attraction between the particles and allow them to pull them apart. The energy is provided when the solid is heated up.
Hence, option B is correct.
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Which method of heat transfer allows you to fry an egg in a frying pan on the stove?
Answer:
Conduction
Explanation:
Answer:
Conduction is correct
Explanation:
PLEASE HELP!! I WILL MARK THE 1st ONE BRAINLIEST!
Answer:
2 3 and 6
Explanation:
how many grams of diazine (N2H2) are there in 2.55 mol of the compound
Answer:
76.5g is present in 2.55mol of diazine
Explanation:
no. of mole equals mass over molar mass
molar mass of diazine equals 30g/mol.. then substitute to get the mass in grams which is 76.5g
What type of compound is disulfur dichloride?
a. organic compound
b. acid (ionic compound)
c. covalent compound
d. ionic compound
Answer:
Covalent compound
Explanation:
It is formed by covalent bonds, in which the atoms share a pair of valence electrons
What is the final concentration of a solution prepared by diluting 35.0 mL of 12.0 M HCl to a final volume of 1.20 L
Answer: The final concentration of a solution is 0.350 M
Explanation:
According to the dilution law,
[tex]C_1V_1=C_2V_2[/tex]
where,
[tex]C_1[/tex] = concentration of concentrated acid solution = 12.0 M
[tex]V_1[/tex] = volume of concentrated acid solution = 35.0 ml
[tex]C_2[/tex] = concentration of diluted acid solution= ?
[tex]V_2[/tex] = volume of another acid solution= 1.20 L = 1200 ml
( 1L=1000ml)
Putting in the values:
[tex]12.0\times 35.0=C_2\times 1200[/tex]
[tex]C_2=0.350M[/tex]
The final concentration of a solution prepared by diluting 35.0 mL of 12.0 M HCl to a final volume of 1.20 L is 0.350 M
An ice cube melts in the hot sun. Is this exothermic or endothermic and
why?
Answer:
Endothermic
Explanation:
In order to melt the ice cube, heat is required, so the process is endothermic. Endothermic reaction In an endothermic reaction, the products are higher in energy than the reactants. Therefore, the change in enthalpy is positive, and heat is absorbed from the surroundings by the reaction.
A cyclist traveled 2 miles in 10 minutes. What is the average speed of the cyclist?
Group of answer choices
Answer:
about 6 min
Explanation:
Pls Help! 100 Points!!!!!
Which of the following correctly compares the radii of F and F−?
A) F has a smaller radius than F− because an additional electron causes greater repulsion in F−.
B) F has a larger radius than F− because an additional electron causes greater repulsion in F.
C) F has a smaller radius than F− because F− has an additional energy shell.
D) F has a larger radius than F− because F has an additional energy shell.
F has a smaller radius than F− because F− has an additional energy shell correctly compares the radii of F and F−. The correct option is C.
Thus, Compared to oxygen, fluorine is a stronger electronegative element. The outermost electrons of fluorine are gripped by the nucleus more tightly than oxygen because fluorine has a high electronegativity.
It takes more energy to remove the outermost electron of fluorine than it does to remove the outermost electron of oxygen. Fluorine has a higher ionization energy than oxygen as a result.
An atom's energy is determined by how much energy it gains or loses as a result of chemical processes that result in electron loss or gain. Exothermic reactions are those in which energy is released, and endothermic reactions are those in which energy is absorbed.
Exothermic reactions produce negative energy, which is why energy is given a negative sign.
Thus, F has a smaller radius than F− because F− has an additional energy shell correctly compares the radii of F and F−. The correct option is C.
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Please help I need a answer to both
Hi , I’m really sorry because I just have the first question... so here it is :
So it is 0.52 mol .
Have a nice day .
Hello I was wondering if anyone knew how to draw the molecular geometry of fentanyl. I already did the Lewis structure.
Answer:
i dont
Explanation:
Unsanitary meat processing, poisonous additives, and false claims about the efficacy of drugs (i.e., "snake oil") resulted in the original Food
and Drugs Act and Meat Inspection Act in 1906.
True or False
which of these is a cost of using paper grocery bags
Answer:
15 cents where im from
Explanation:
Question 1 of 7
Which sentence correctly explains the change that occurs when ice melts?
Ice melting is a physical change, and the state of the substance remains the same.
Ice melting is a physical change, and the mass of the substance remains the same.
оо оо
Ice melting is a chemical change, and the state of the substance remains the same.
Ice melting is a chemical change, and the mass of the substance remains the same.
Answer:
Explanation:B ice melting is a phiyscal change and the mass of the substance remains the same
Answer:
b
Explanation:
Predict and write the charges and symbols of the monatomic ions formed by the following atoms: bromine rubidium
Answer: The monoatomic ions formed by bromine and rubidium are [tex]Br^-[/tex] and [tex]Rb^+[/tex] respectively.
Explanation:
When an atom accepts an electron negative charge is created on atom and is called as anion. When atom loses an electron positive charge is created on atom and is called as cation.
The atomic number of bromine and rubidium is 35 and 37 respectively. So, the number of electrons is equal to 35 and 37 respectively. Bromine will gain one electron and rubidium will lose one electron to attain stable electronic configuration to form [tex]Br^-[/tex] and [tex]Rb^+[/tex] respectively.
[tex]Br:35:1s^22s^22p^63s^23p^64s^23d^{10}4p^5[/tex]
[tex]Br^-:36:1s^22s^22p^63s^23p^64s^23d^{10}4p^6[/tex]
[tex]Rb:37:1s^22s^22p^63s^23p^64s^23d^{10}4p^63s^1[/tex]
[tex]Rb^+:36:1s^22s^22p^63s^23p^64s^23d^{10}4p^6[/tex]
10 The rate of the reaction between hemoglobin (Hb)
and carbon monoxide (CO) was studied at 20°C.
The following data were collected with all
concentration units in u mol/L. (A hemoglobin
concentration of 2.21 u mol/L is equal to
2.21 x 10 mol/L.)
[Hblo [CO),
Initial Rate
(u mol/L) (u mol/L) (u mol/Ls)
2.21
1.00
0.619
4.42
1.00
1.24
4.42
3.00
3.71
(a) Determine the orders of this reaction with
respect to Hb and CO.
(b) Determine the rate law.
(c) Calculate the value of the rate constant.
(d) What would be the initial rate for an
experiment with [Hb]o =3.36 u mol/L
[CO] =2.40 4 mol/L?
Answer:cookie
Explanation:
The table below shows the average seasonal relative humidity during the summer in four locations:
Relative Humidity
Location Average Seasonal Relative Humidity (%)
A
76
81
с
60
D
98
B
Which location is most likely to experience frequent summertime storms? (3 points)
Location A
Ob
Location B
Oc
Location C
Od
Location D
Answer:
C
Explanation:
It’s the lowest to create storms
Plzzzz answer quick
An excited electron of hydrogen emits the least energy when it drops from 1 point
quantum levels *
Level 4 to level 2
level 5 to level 1
level 2 to level 1
O level 2 to level 5
Answer:
sorry to do this but I really needed some points to ask my question from someone else so that's why I am doing so really sorry and thank you for free points
The number of atoms of any element in the given chemical formula is the number that is written on the foot of the symbol of that element. Therefore, the correct option is option C.
What is atom?Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound.
Atom consists of electron, proton and neutron. The total mass of atom is inside the nucleus. Inside the nucleus proton and neutron is there. So calculate mass of an atom, total mass of all protons is added to the total mass of neutron. Electrons revolve around the nucleus.
If an electron of hydrogen gets excited and drops from energy level 2 to level 1 to release least energy. The level shows the energy levels.
Therefore, the correct option is option C.
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Solid nickel reacts with aqueous lead (II) nitrate to form solid lead. What is the net ionic equation for this reaction? • Hint: In this reaction, nickel exhibits its most common oxidation state of +2. • Be sure to include the charge for each ion in the net ionic equation. Provide your answer below: (s) + (aq) → *(n)
Answer:
Pb²⁺(aq) --> Ni²⁺(aq)
Explanation:
The equation of the reaction is given as;
Ni(s) + Pb(NO₃)₂(aq) --> Pb(s) + Ni(NO₃)₂(aq)
In writing the ionic equation, we break the aqueous compound into ions. The solid and liquid compounds are ignored.
We have;
Pb²⁺(aq) + NO₃²⁻(aq) --> Ni²⁺(aq) + NO₃²⁻(aq)
Canceling the spectator ions;
Pb²⁺(aq) --> Ni²⁺(aq)
Answer:
Ni(s)+Pb2+(aq)→Ni2+(aq)+Pb(s)
Explanation:
The complete ionic equation of this reaction is
Ni(s)+Pb2+(aq)+2 NO−3(aq)→Ni2+(aq)+2 NO−3(aq)+Pb(s)
The nitrate ions are spectator ions and can be removed from the equation, giving us
Ni(s)+Pb2+(aq)→Ni2+(aq)+Pb(s)
A mixture of 80.0 g of oxygen and 80.0 g of helium has a total
pressure of 0.1800 atm. What is the partial pressure of each gas?
Answer:
Partial pressure of O₂ = 0.0198 atm
Partial pressure of He = 0.1584 atm
Explanation:
Given data:
Mass of oxygen = 80.0 g
Mass of helium = 80.0 g
Total pressure = 0.1800 atm
Partial pressure of each gas = ?
Solution:
First of all we will calculate the number of moles.
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 80.0 g/ 32 g/mol
Number of moles = 2.5 mol
Number of moles of helium:
Number of moles = mass/molar mass
Number of moles = 80.0 g/ 4 g/mol
Number of moles = 20 mol
Total number of moles = 20 mol + 2.5 mol = 22.5 mol
Mole fraction of O₂ = 2.5 mol/ 22.5 mol = 0.11
Mole fraction of He = 20 mol / 22.5 mol = 0.88
Partial pressure:
Partial pressure of O₂ = 0.11× 0.1800 atm = 0.0198 atm
Partial pressure of He = 0.88 × 0.1800 atm = 0.1584 atm
7) If the mass of an object is 20 g and its volume is 25 L. What is the density of this object? 1 8) What is the difference between accuracy and precision? Copy and paste a picture of something that accurate but not precise and also something that is precise, but not accurate. 9) What is the formula for percent error?
this is due under 30 mins, please help
Answer:
Accuracy is the closeness of a measured value to the accepted or exact value. The precision of a tool is the smallest unit of measure the tool provides. The smaller the units a tool can measure, the more precise the tool. A measurement can be precise and not be accurate.
Explanation:
What is the relationship between pressure and temperature
Answer:
The Pressure Temperature Law. This law states that the pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature. With an increase in temperature, the pressure will go up.
Explanation:
which of the elements below has a smaller atomic radius. element1: 1s2 2s2 2p4 element2: 1s2 2s2 2p5
Answer:
both are same give different number
As a sample's temperature increases, which two factors also increase?
A. Particle speed
O.B. Particle boiling point
C. Particle kinetic energy
D. Particle size
Help please
Answer:
speed
energy
Answer:
particle speed and particle energy
Explanation:
i just took the quiz on a p e x
A student is conducting an experiment to see which material, when placed in a closed circuit, will still allow a light bulb to light up. With which material would the student have success?
A.sulfur
B.copper
C.glass
D.wood
The student would have success in experiment with using copper in a closed circuit as it allows conduction and is a good conductor of electricity.
What is conduction?Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.
In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .
When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:
1) heat conduction
2) electrical conduction
3)sound conduction
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A 7-kg bowling ball is rolled down a lane while a 10-kg cart remains at rest. Which has the greatest inertia?
Im sorry but I have the same question tell me when you figure it out please
what can chemically be broken down into a simpler substance
Answer: ea sports
Explanation:
A compound is a substance that contains two or more elements chemically combined in a fixed proportion. However, it is not an element because it can be broken down into simpler substances – carbon and hydrogen. ... Recall that the components of a mixture can be separated from one another by physical means.
Gustavo and Beatriz are pushing on a door in opposite
directions. If the door does not move, the forces are
The net force in this scenario would be Answer: balanced and zero
Answer:
Correct
Explanation:
Balanced forces are always zero!
Answer:
Balanced
Zero
Explanation: