which statement is generally true about CaCaI2 ?
Explanation:
"Its bonds are formed by large differences in electronegativity" is the statement among the choices given in the question that is generally true about CaCl2.
what are your thoughts on Galileo's idea about motion? i need the answer pls
Answer:
Galileo believed that a projectile is a combination of uniform motion in the horizontal direction and uniformly accelerated motion in the vertical direction. If it is not impeded, it will continue to move even without an applied force
Which statement best describes how forces are important to chemistry?
A. Forces are transferred when atoms form ions.
B. Forces are released during chemical reactions.
C. Forces determine the extent of a reaction.
D. Forces hold atoms and molecules together.
Answer:
D
Explanation:
What is the molarity of 2 moles of a compound dissolved in 4 L of water?
A. 2 M
B. 0.5 M
C. 4M
D. 1 M
Answer:
[tex]\boxed {\boxed {\sf B. \ 0.5 \ M}}[/tex]
Explanation:
Molarity is a measure of concentration in moles per liter. The formula for calculating molarity is:
[tex]molarity= \frac{moles \ of \ solute}{ liters \ of \ solution}[/tex]
There are 2 moles of a compound or the solute. There are 4 liters of water or the solution.
moles of solute= 2 mol liters of solution = 4 LSubstitute the values into the formula.
[tex]molarity = \frac{ 2 \ mol}{ 4 \ L}[/tex]
Divide.
[tex]molarity= 0.5 \ mol /L[/tex]
1 mole per liter is equal to 1 Molar, so the solution's molarity of 0.5 mol/L is equal to 0.5 M.
[tex]molarity = 0.5 \ M[/tex]
The molarity of the solution is 0.5 Molar and choice B is correct.
what is meant by reactive elements
Answer; relative elements are most reactive elements and compounds may ignite spontaneously or explosively. They generally burn in water as well as the oxygen in the air
Explanation:
Answer:
Reactive elements are the elements which are ready to gain electrons because they have incompletely filled outermost shell.
Hope its helpful!
Please mark me as brainlist.
what is the formula of water
Answer:
The formula of water is H20
career in chemistry list ten
Explanation:
Chemistry Teacher.
Chemical Engineer.
Forensic Scientist.
Geochemist.
Biochemists
Pharmacologist
Analytical Chemist
Envionmental chemist
Water Chemist
Catalysis
5. The tradition of giving teachers an apple goes back to 19th century Denmark, where
teachers didn't earn enough for food. So, parents would send their children to school
with an extra snack for the teacher. Would current stdents' grades increase if they
brought in treats for their teachers?
Make a hypothesis help plz
Answer:
The apple, that innocent bud of an Americana autumn, has pulled off one of the greatest cons of all time. As students across the country prepare to greet a new school year and teacher with a polished bit of produce, the apple cements its place in the patriotic foods pantheon despite its dodgy past.
Answer:
If students brought an extra snack for their teachers it doesn't necessarily mean their grades would increase, but it's not impossible. A lot of teachers today might view it as being something like a suck-up. However, I do know that there are teachers who might be touched by such gestures and give the students extra attention, with this their grades might improve with the extra attention.
Explanation:
Umm yeah change the wording this is the best i got right now and good luck on whatever you're doing right now ig
plz solve the question and send the answer
I will give u branist n like u and even follow u back plz help me
Answer:
P¹V¹/T¹=P²V²/T² here
P²= 1.25- atm
V²=?
T²=345K
P¹=0.75-atm
V¹=120
T¹=295K
So V²= (0.75 x120/295)x(345/1.25)
Volume of the gas V²= 84.20- ml
Answer:
Solution given:
at first
volume[tex]V_{1}=120.0ml[/tex]
pressure [tex]P_{1}=0.75atm[/tex]
temperature [tex]T_{1}=22+273=295°K[/tex]
after increasing temperature and pressure
volume[tex]V_{2}=xml[/tex]
pressure [tex]P_{2}=1.25atm[/tex]
temperature [tex]T_{2}=70+273=343°K[/tex]
now
By using Combined gas equation[tex]\frac{P_{1}V_{1}}{T_{1}}=\frac{P_{2}V_{2}}{T_{2}}[/tex]
substituting value
[tex]\frac{0.75*120}{295}=\frac{1.25*x}{343}[/tex]
0.305=5x/1372
Doing criss cross multiplication
5x=0.305*1372
x=418.46/5
x=83.69ml
x=84ml
the volume will be 84ml
What is Spontaneous ion
Why are the highest oxidation state of the transition metal stabilised in the oxide and fluoride compond?
Answer:
Following are the solution to the given question:
Explanation:
Its maximum oxidation zone is exceptionally stable and has the greatest ability to charge density, while fluoride and oxide ions are the largest particles with the largest durability of charge.
Or it might be assumed as oxygen and fluorine are the system particle atoms that have the highest electron number of metals.
Pls help!!! I will mark you as brainliest if you answer the question!!
PLS GUYS!!! HELP!!!!!!!!!!
1 — Element D and A ( Which are Sodium and aluminium )
2 — ( 2 + 8 + 3 = 13 electrons total ) Element A Because it's atomic number is 13.
3 — Element E Is stable. ( Which is Argon )
( Note, Elements which has 8 election on its outermost cell is stable. ( Helium is exception which is a noble gas but have 2 electrons in outermost cell )
4 — Element F , which is hydrogen. ( Hydrogen is the only element to not have any neutron )
5 — Element D ( Which is sodium )
6 — The element F ( Which is hydrogen ) Don't contain any neutron.
________________________________
which of the following statements is true about alkali?
A) bases that soluble in water
B) shows a pH value less than 7
C) Ionises in water to form hydroxonium ions
D) Reacts with carbonate salt to release carbon dioxide gas
Answer:
it should be letter c
Explanation:
I hope this help
Substances that contain a transition metal can be oxidizing. The greater the number of oxidation of this metal, the greater the oxidizing character of the substance. In an industrial process in which the use of an oxidizing agent is necessary, only five substances are available: CaO, FeO, Cu₂O, Cr₂O₃ and KMnO₄.
The substance that should be used in this process, as it has a greater oxidizing character, is:
a) Cr₂O₃
b) Cu₂O
c) CaO
d) FeO
e) KMnO₄
Place These Bodies Of Our Solar System In Proper Order Of Formation
1.The Sun
2.Outer Planets
3.Planetesimals
4.Inner Planets
5. Solar Nebula
How many liters are in 4.5 moles of CO2 gas at STP? Pls help :)
Answer:
Explanation:
NCO 2= 4,5
VCO2= 4,5* 22,4=100,8
Which option describes the structure of the electron shells in a neutral carbon atom? (1 point)
O The inner shell is complete with four electrons. The outer shell is incomplete with two electrons.
O The inner shell is incomplete with three electrons. The outer shell is incomplete with three electrons.
O The inner shell is complete with three electrons. The outer shell is incomplete with three electrons.
O The inner shell is complete with two electrons. The outer shell is incomplete with four electrons.
Answer:
The inner shell is complete with two electrons. The outer shell is incomplete with four electrons.
Explanation:
There can only be 2 electrons on the first (inner) shell, so it would be complete with two and there needs to be 8 electrons on the outer shell for it to be complete, so it would be incomplete with 4.
Hope this helps :)
Answer:
(Question 1) Metallic bonds are responsible for many properties of metals, such as conductivity. Why is this possible?
(Answer) The bonds can shift because valence electrons are held loosely and move freely.
(Question 2) Between which types of elements do ionic bonds occur, and how do electrons act within the bond?
(Answer) metals and nonmetals, electrons transferred
(Question 3) Which kind of bond would occur between sodium (Na, Group IA) and chlorine (Cl, Group VIIA)?
(Answer) ionic
(Question 4) Why is carbon said to provide a “backbone” in many molecules?
(Answer) Carbon atoms can form chains and branches with each other, and other atoms can attach to these.
(Question 5) Which option describes the structure of the electron shells in a neutral carbon atom?
(Answer) The inner shell is complete with two electrons. The outer shell is incomplete with four electrons.
Explanation:
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22.4l of ammonia is reaxts with 1.406 mole of oxygen to produce NO and h2o .1.what volume of no is produced at ntp
Answer:
The volume of NO is 22.4L at STP
Explanation:
Based on the reaction:
2NH3 + 5/2O2 → 2NO + 3H2O
2 moles of NH3 react with 5/2 moles of O2 to produce 2 moles of NO.
To solve this question, we need to find the moles of each reactant in order to find the limiting reactant as follows:
Moles NH3 -Molar mass: -17.01g/mol-
Using PV = nRT
PV/RT = n
Where P is pressure = 1atm at STP
V is volume = 22.4L
R is gas constant = 0.082atmL/molK
T is absolute temperature = 273.15K
1atm*22.4L/0.082atmL/molK*273.15K = n
n = 1.00 moles of NH3
For a complete reaction of 1.00 moles of NH3 are needed:
1.00 moles NH3 * (5/2moles O2 / 2moles NH3) = 1.25 moles of O2
As there are 1.406 moles of O2, the limiting reactant is NH3
The moles of NO produced are the same than moles of NH3 because 2 moles of NH3 produce 2 moles of NO. The moles of NO are 1.00 moles
And as 1.00moles of gas are 22.4L at STP:
The volume of NO is 22.4L at STPDescribe how methane is
formed in terms of chemical bonding
Blood test can be used to check a person's blood glucose and hormone levels. The tabular column given below shows the result of two blood tests carried out on three people to check their blood glucose levels. Person 1 is healthy.
A:- Compare the glucose levels of person 1 with the glucose levels of person 2 after fasting for 12 hours.
B:- Compare the glucose levels of person 3 with the glucose levels of person 1, 2 hours after drinking 75g glucose.
C:- Person 3 cannot be produce the hormone that control blood glucose levels. State the hormone that person 3 cannot produce.
( THE ORDER OF THE PHOTO IS:- person 1, and person 2, and person 3)
Pls it is urgent
Answer:
Explanation:
1) person 2 had a slightly higher blood glucose level than person 1 after fasting 12 hrs (0.2mmols)
2) person 3 has a much higher blood glucose level than person 1 after taking glucose (5.6mmols)
3) insulin
in order to decrease the freezing point of 500. g of water to 1.00° c how many grams of ethylene glycol (C2H602)must be added (KF=1.86°C kg solvent)
Answer:
if wrong sorry ok????
Three Balanced equations for Ammonium salt+Alkali=Salt+water+carbon dioxide
Answer:
NH₄Cl (aq) + NaOH (aq) -> NaCl (aq) + H₂O (l) + NH₃ (g)
(NH₄)₂CO₃ (aq) + 2KOH (aq) -> K₂CO₃ (aq) + 2H₂O (l) + 2NH₃(g)
NH₄NO₃ (aq) + LiOH (aq) -> LiNO₃ (aq) + H₂O (l) + NH₃ (g)
Explanation:
The gas liberated when an alkali reacts with an ammonium salt is NH₃ (ammonia), not CO₂.
Isobutane (C4H10) is one of the components of natural gas. Which equation
shows the balanced combustion reaction for isobutane?
A. C4H10 + O2 + 4CO2 + H2O + heat
B. C4H10 + O2 + CO2 + H2O + heat
C. C4H10 + O2 + 4C02 + 5H20 + heat
D. C4H10 +6.502 → 4002 + 5H20 + heat
SUBMIT
Answer:
D. C₄H₁₀ + 6.5O₂ → 4CO₂ + 5H₂O + heat
Explanation:
The reaction of the combustion of isobutane with oxygen is presented as follows;
C₄H₁₀ + 6.5O₂ → 4CO₂ + 5H₂O + heat
In the above reaction, the number of elements on the reactant side are;
4 carbon, C, atoms, 10 hydrogen, H, atoms, and 13 oxygen, O, atoms
The number of elements on the product side of the above chemical reaction are;
The number of carbon atoms, C = 4
The number of hydrogen atoms, H = 10
The number of oxygen atoms, O = 13
Therefore, the number of atoms on the reactant side of the chemical equation are equal to the number of atoms on the product side, and the combustion reaction for isobutane is balanced.
Hurry PLEASEEE
How many grams are 1.20 x 10^°25molecules of
calcium iodide?
Please show work!:)
Predict with a reason, what would happen to a packet of potato chips that is packed with air when it is taken to o high mountain.
Explanation:
If you bring an unopened bag of potato chips aboard an airplane you'll notice that the bag puffs up as the plane ascends to a higher altitude explain why this happens using the information and terminology you learned in this module
I'm having trouble understanding what "the difference in energy between the products and reactants from the surroundings" means. Can you help explain what this means? please
Answer:
The energy change in a chemical reaction is due to the difference in the amounts of stored chemical energy between the products and the reactants. This stored chemical energy, or heat content, of the system is known as its enthalpy.
Explanation:
Due to the absorption of energy when chemical bonds are broken, and the release of energy when chemical bonds are formed, chemical reactions almost always involve a change in energy between products and reactants. By the Law of Conservation of Energy, however, we know that the total energy of a system must remain unchanged, and that oftentimes a chemical reaction will absorb or release energy in the form of heat, light, or both.
A Questic
Is the following reaction feasible at 340K? Mg + ZnO -> MgO + Zn Enthalpy Data: Mg: 0 kJ/mol ZnO: -348 kJ/mol MgO:-602
kJ/mol Zn: 0 kJ/mol Entropy Data: Mg: 33 J/K mol ZnO: 44 J/K mol MgO: 42 J/K mol Zn: 27 J/K mol
A. No, it is not feasible because the Gibbs free energy change is negative.
OB. Yes, it is feasible because the Gibbs free energy change is negative.
C. No, it is not feasible because the Gibbs free energy change is positive.
D. Yes, it is feasible because the Gibbs free energy change is positive.
Answer:
No, it is not feasible because the Gibbs free energy change is positive
Explanation:
∆Hreaction= (-602 KJ/mol) - (-348 KJ/mol) = -254 KJ/mol
∆Sreaction = (42 + 27) J/Kmol - (33 + 44) J/K = -8J/Kmol
From;
∆G = ∆H - T∆S
∆G = 254 × 10^3 J/mol - [340K × (-8 J/Kmol)]
∆G = 2.57 × 10^5 J/mol
Note that when the change in free energy is positive, a reaction is non spontaneous. Only a reaction that has a negative change in free energy is spontaneous.
Answer:
B. Yes, it is feasible because the Gibbs free energy change is negative.
Explanation:
I passed the exam 100/100
the pH value of 0.1 mol dm-3 of acid U is 1. Which statement is true about acid U?
A) slightly soluble in water
B) reacts only with a weak alkali
C) the degree of ionization in water is high
D) has a low concentration of hydrogen ions
Answer:
the degree of ionization in water is high
Explanation:
The term pH is defined as the negative logarithm of hydrogen ion concentration.
Hence;
pH = -log[H^+]
The pH scale shows the degree of acidity or alkalinity of a solution. A solution of pH 1 is a strong acid. A strong acid dissociates completely in solution.
Hence, acid U has a high degree of ionization in water.
hii pls help me to balance the equation and state the symbols thanksss
Answer:
I DID HOW I KNOW . I HOPE IT WILL HELP YOU :D
cho hỗn hợp gồm alcl3 và fecl3 trình bày cách tách từng muối riêng ra khỏi hỗn hợp
Answer:
ném NaOH vào thì th AlCl3 tan hết còn lại kết tủa Fe(OH)3 lần.
Lọc kết tủa riêng phần dung dịch tan riêng
Rồi Cho HCl vô lại là xong
Explanation:
