Answer:
To calculate the number of neutrons, subtract the atomic number (which equals the number of protons) from the mass number.
hope this helps☆☆☆
Which of the following are phase changes? (Select all that apply.)
melting
gases
sublimation
reactions
Answer:
- melting
- sublimation
Explanation:
A phase change is a, well, change between phases. Solid to liquid. Gas to solid. Etc. Gases is a phase, but not a change. Reactions is a change, but not a phase change. This leaves us with melting (solid to liquid) and sublimation (solid to gas).
Have a nice day!
I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)
- Heather
Does ZnS,MnS,NiS and CoS (Group IV Sulphides) dissolve in dil.HCl? And I want to know the reasons
Answer:
..
Explanation:
In a significantly acidic medium, even a soluble sulfide like sodium sulfide will not facilitate precipitation of Fe, Zn, Mn, Co and Ni as their sulfides.
To form a charge of +2 an atom must________electrons.
To form -3 it must ________ electrons.
Multiple choice:
1) gain2 ;lose 3
2) gain3: lose2
3) lose2;gain3
4) lose3; gain2
Answer:
Explanation:
3
which is larger 0.45 mol of a material or 2.75×10^23 of the same material?
Would results of solubility of sugar dissolving in water change if a person used a different solute?
Answer:
If a solute is a solid or liquid, increasing the temperature increases its solubility. For example, more sugar can dissolve in hot water than in cold water. If a solute is a gas, increasing the temperature decreases its solubility. For example, less carbon dioxide can dissolve in warm water than in cold water.
Explanation:
(Total for Question 3-5 marks)
Q4. Carbon monoxide and hydrogen are used in the manufacture of methanol (CH3OH)
The reaction is reversible and can reach a position of dynamic equilibrium.
CO(g) + 2H, (g) = CH OHg) AH = -91 kJ/mol
The reaction is carried out at a pressure of about 100 atmospheres and a temperature of 250°C.
(a) State two features of a reaction that is in dynamic equilibrium.
1
2
Page 9 of 11
Answer:
1. Forward and Backward reaction rate are equal
2. Concentration of reactants and products are the same.
which compound is soluble in excess ammonia solution. A. Copper (II) sulphate B. iron (II) chloride. C.Magnesium chloride. D. Magnesium Chloride
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Question~}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
Solve this question ~
Find the Hybridization of N in compound " NH3 " and determine its shape ~
Let's check Electronic configuration of N in ground state
[tex]\\ \sf\longmapsto 1s^22s^22p^3[/tex]
In exited state[tex]\\ \sf\longmapsto 1s^22s^22px^12py^12pz^2[/tex]
3 p orbitalsIn hydrogen case
[tex]\\ \sf\longmapsto 1s^1[/tex]
1 s orbitalHence Hybridization
[tex]\\ \sf\longmapsto s-p-p-p[/tex]
[tex]\\ \sf\longmapsto sp^3[/tex]
Structure is tetrahedral .
Spare way:-
Bond pairs==3=>Bonding electrons=6Lone pair=1=>Anti bonding electrons=2Hybridization
[tex]\\ \sf\longmapsto \dfrac{1}{2}[\sigma+\sigma *][/tex]
[tex]\\ \sf\longmapsto \dfrac{1}{2}[6+2][/tex]
[tex]\\ \sf\longmapsto \dfrac{1}{2}[8][/tex]
[tex]\\ \sf\longmapsto 4[/tex]
sp3 HybridizationShape-Tetrahedral .⚠️⚠️⚠️⚠️HELPPP⚠️⚠️⚠️⚠️
A 250 kg rock falls off a cliff and comes to a rest on the ground, which is 40m below the cliff. At what point is the rock’s kinetic energy at maximum?
Answer:
at 39m
Explanation:
because thats where gravitational potential energy has been acting on it the most before it hits the ground.
pretty sure btw
Indique cuáles son las unidades de la molaridad *
eq-g/m³
eq-g/L
mol/cm³
mol/L
Answer:
hm
Explanation:
how is the mode of data set defined
it is the middle value of the set
Answer:
No, mode isnt the middle value of a set that is median.
Explanation:
Mode (also known as modal class) is the value that appears most frequently in a data set.
Convert 4.0 moles of krypton into liters of krypton.
Answer:
4.0 moles of krypton converts to 89.6L.
Explanation:
To convert moles to liters, remember that at standard temperature and pressure (STP), 1 mole is equal to 22.4 liters. Multiply your mole value - in this case, 4.0 - by the molar volume constant, 22.4L, to convert moles into liters. 4.0 x 22.4 is equal to 89.6, thus your answer is 89.6L.
We can check this by dividing 89.6 by 4.0, which will give us the molar volume constant 22.4L, proving that this answer is correct.
What is the white solid that quickly forms when the methyl salicylate is added to the sodium hydroxide solution
What are the features that allow you to identify an ionic compound based on its chemical formula
Answer:
first identify the cation and write down its symbol and charge. Then, identify the anion and write down its symbol and charge.
Explanation:
A chemist heats a fixed amount of gas in a sealed glass container. Which law is the chemist most likely
investigating? (1 point)
O Charles's law, by seeing how changes in temperature affect the volume of the gas
O Charles's law, by seeing how changes in temperature affect the pressure of the gas
O Gay-Lussac's law, by seeing how changes in temperature affect the volume of the gas
O Gay-Lussac's law, by seeing how changes in temperature affect the pressure of the gas
The chemist is most likely investigating Gay Lussac's law. To study the changes in temperature affect the pressure of the gas when a fixed amount of gas is heated in a sealed glass container. Therefore, option (D) is correct.
What is Gay Lussac's law?Gay-Lussac's law states that when the volume of the gas is kept constant the pressure of a gas is directly proportional to the absolute temperature.
The mathematical expression of Gay Lussca's law can be written as follows:
P/T = k
It can be also represented as the pressure being directly proportional to the temperature of the gas.
P ∝ T (where V volume of gas is constant)
or
[tex]\frac{P_1}{T_1} =\frac{P_2}{T_2}[/tex]
Where P₁ and T₁ are the initial temperature and pressure of the gas. The P₂ and T₂ are the final temperature and pressure of the gas.
As the container is sealed on heating the volume of the gas will not change. On increasing the temperature the molecules of the gas acquire more and more kinetic energy. So the pressure of the gas will increase.
Therefore, the chemist is investing the Gay-Lussac's law by noticing how changes in temperature affect the pressure of the gas.
Learn more about Gay Lussac's law, here:
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1. What are five examples of observable properties?
what do you put in the turkey cavity when not using stuffing
What happens to the ionizing rate if the steps of ionizing polyprotic acid increases?
Answer:
An acid that contains more than one ionizable proton is a polyprotic acid. The protons of these acids ionize in steps. The differences in the acid ionization constants for the successive ionizations of the protons in a polyprotic acid usually vary by roughly five orders of magnitude.Answer:
What happens to the ionizing rate if the steps of ionizing polyprotic acid increases? Well they have this stepwise ionization process occurs for all polyprotic acids
Explanation:
The gain of electrons by an element or ion in a reaction is called __.
A. fractionation
B. Disproportionation
C. Oxidation
D. Reducing
Answer:
Reduction
Explanation:
took the test
sodium chloride is a compound of sodium and chlorine. which of these elements is the alkali metal and which is the halogen. why
Answer:
Chlorine is a halogen and sodium is an alkali metal.
Explanation:
Salt dissolving in water is an example of what?
chemical change
chemical property
Physical Change
Answer:
chemical change
Explanation:
because chemical chande is a permanent change
Pls help me!! Explain how the N:Z ratio can help predict the type of radiation Zr-85 and Zr-95 emit.
No links pls
Based on N:Z ratio, Zr-85 is expected to decay by positron emission. Zr-95 is expected to emit beta particles in a beta decay.
The N:Z ratio determines the stability of a nucleus. If a nucleus has N:Z ratio >1.5 or <1.0, such a nucleus is unstable and will undergo radioactive decay. The aim of such a decay is to attain a favorable N:Z ratio.
For Zr -85, the N:Z ratio is 1.1 while the N:Z ratio of Zr-95 is 1.4. Zr -85 is expected to decay by positron emission which increases the N:Z ratio. For Zr-95, the nucleus tends to undergo processes that decrease the N:Z ratio such as beta emission.
Learn more: https://brainly.com/question/2192784
reagents that can be used to convert CH3MgBr to CH4 are?
a) H2O
b) CH3-C - - -(triple bond) CH
c) R3CH
d)H2C=CH2
Answer:
reagents that can be used to convert CH3MgBr to CH4 are?
a) H2O
b) CH3-C - - -(triple bond) CH
c) R3CH
d)H2C=CH2
its a) H20
Which is one factor that adds to the greenhouse effect?
a decrease in the amount of dust in the atmosphere
a decrease in the amount of water on Earth’s surface
an increase in gases in the atmosphere that absorb heat
an increase in the amount of solar radiation that reflects into space
Answer:
C
Explanation:
Edge 2022 trust the process
Knowing about the greenhouse effect we have that what intensifies this effect is an increase in gases in the atmosphere that absorb heat.
What is the greenhouse effect?Greenhouse effect is a natural atmospheric phenomenon responsible for the maintenance of life on Earth. Without the presence of this phenomenon, the temperature on Earth would be very low, around -18ºC, which would make the development of living beings impossible.
Thus, the main cause of the greenhouse effect is industrialization. Due to this process, the burning of fossil fuels has intensified in recent centuries. The main products of the combustion reaction of these reagents are the gases mentioned above as the main ones for the greenhouse effect.
See more about greenhouse effect at brainly.com/question/1577730
In the malate-aspartate shuttle, _____ is reduced to _____ in the cytosol. oxaloacetate; malate aspartate; malate malate; aspartate malate; oxaloacetate aspartate; oxaloacetate
The malate-aspartate shuttle enables oxidative phosphorylation by allowing electrons to be moved across the inner membrane in the mitochondrion during glycolysis in eukaryotes.
In this malate-aspartate shuttle, oxaloacetate is reduced to malate in the cytosol.
During this biochemical system process, the cytosolic malate dehydrogenase which is the primary enzyme present in this shuttle system catalyzes the reaction of oxaloacetate and NADH to produce malate and NAD in the cytosol. This system enables oxidative phosphorylation in eukaryotes.Learn more: https://brainly.com/question/17216910
Select the atom that will attract the electron pair (:) more strongly (the atom with the greater electronegativity)
HELP PLEASE
Which does ionic bonding involve?
why do atmospheric carbon dioxide levels fluctuate during the year?
Answer: The amount of CO2 found in the atmosphere varies over the course of a year. Much of this variation happens because of the role of plants in the carbon cycle
Which of the following typically increases the rate of a chemical reaction? А avoiding the use of a catalyst B heating the reaction C increasing the volume of the reaction vessel D decreasing the concentration of the reactants
B: heating the reaction
hope i could help :D
_KOH+_H3PO4=_K3PO4+_H2O
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
The balanced chemical equation for given reaction is ~
[tex] \sf{3KOH + H_3PO_4 \rightarrow K_3PO_4 + 3H_2O}[/tex]