Answer:
B
Explanation:
hope it helps
the basic fact that determines molecular shapes is that
Answer:
The shape of a molecule is mostly determined by repulsion among the pairs of electrons around a central atom.
What is the balanced, net ionic equation for the reaction shown below. Identify the spectator ions.
Sr(NO3)2 (aq) + H2SO4 (aq) → SrSO4 (s) + 2HNO3 (aq)
Answer:
i need an aswer for this question too
Explanation:i think the balanced net equation is s0sr4 but thats probably wrong lol
How does Bone Marrow Donor Program work?
Name some diseases that can be cured by bone marrow transplant.
What is Donors’ Registry Program?
noooooooooooooooooooooo
Word Equation for Magnesium reacting with Iron Chloride
Answer:
3Mg+2FeCl3------------3MgCl2+ 3Fe
How many formula units are in 0.0022 mol of NaCl (it’s urgent plz)
Answer:
1.204 × 10²¹ unitsExplanation:
The number of formula units can be found by using the formula
N = n × L
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 0.002 × 6.02 × 10²³
We have the final answer as
1.204 × 10²¹ unitsHope this helps you
10.00g of hydrated sodium sulfate decomposes to form 4.40g Na(2)SO(4).xH(2)O -> NaSO(4) + xH(2)O of anhydrous sodium sulfate on heating. What’s the formula mass of hydrated sodium sulfate and the value of x?
please help i have no clue!
X=10
Explanation and workout is in the photo attached with this answer
The formula mass of hydrated sodium sulfate is Na₂SO₄.10H₂O. The value of x is equal to 10.
What is the mole concept?A mole is the amount of substance containing the same number of elementary entities as the number of atoms present in a pure sample of any element.
A mole is also described as the amount of a substance that contains 6.022×10²³ fundamental entities of the given substance.
The mole concept is a convenient method of representing the amount of a substance.
Given, the mass of the hydrated sodium sulfate = 10.0g
The mass of the anhydrous sodium sulfate is produced = 4.40g
Mass of the water evaporated as water on heating = 10.0 - 4.40 = 5.6g
The number of moles of water = 5.6/18 = 0.31 mol
Similarly, the number of moles of sodium sulfate = 4.4/142.04 = 0.031 mol
The ratio of the number of the moles of the sodium sulfate and water:
[tex]\frac{n(H_2O)}{n(NaSO_4)}=\frac{0.31}{0.031} = 10[/tex]
Therefore, the ten moles of water will be evaporated for the one mole of sodium sulfate. Therefore, the formula mass is Na₂SO₄.10H₂O.
Learn more about the mole concept, here:
https://brainly.com/question/22540912
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4NaCl + 2SO2 + _____H2O + _____O2 → _____Na2SO4 + 4HCl
Which numbers balance this equation?
- 1,2,4
- 1,2,2
- 2,1,2
- 2,1,4
The numbers that balance the following equation: 4NaCl + 2SO2 + H2O + O2 → Na2SO4 + 4HCl is 2, 1, 2.
BALANCING EQUATION:
Balancing a chemical equation means to make sure that the number of atoms of each element on both sides of the equation are equal. According to this question, the following chemical reaction are given: 4NaCl + 2SO2 + H2O + O2 → Na2SO4 + 4HCl Some of the coefficients (numbers) have been placed there while some are missing. The equation that includes the missing coefficients (numbers) to balance the equation is:4NaCl + 2SO2 + 2H2O + O2 → 2Na2SO4 + 4HCl
Learn more at: https://brainly.com/question/21049751?referrer=searchResults
Answer:212
Explanation:yeah
distance from the nucleus to the outermost electron orbital
Identify what the conjugate acid/base would be. FOR KOH?
Answer: As K+ is a very weak conjugate acid of KOH, hence it has no ability to react with either OH– ion or with water molecules ions.
Explanation: Name of Molecule Potassium hydroxide
Chemical formula KOH
pH value 12 to 13
Conjugate acid K+
density is 6g/mL and volume is 40 mL what is the mass
Answer:
240g
Explanation:
Using the equation m=pV, where m=mass, p=density, and V=Volume
m=(6)(40)=240
m=240
Which contains more atoms, 10. 00 g of aluminum or 10. 00 g of lead? Can you explain without using mathematical conversions?.
Explanation:
divide the weight in grams by the atomic mass from the periodic table, then multiply the result by Avogadro's number..
Hope this works!!
How are exo- and endothermic reactions different? Give an example of each.
Answer:
In simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system. A popular example of an endothermic chemical reaction is photosynthesis.
(i searched in g o o gle)
What occurs as potassium nitrate is dissolved in a beaker of water, indicating that the process is endothermic?
(1) The temperature of the solution
decreases because heat was
released.
(2) The temperature of the solution increases because heat was absorbed.
(3) The solution changes color.
(4) The solution gives off a gas.
Calculate the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy.
Q = mcΔT
The specific heat of water is 4.18 J/g°C.
Taking into account the definition of calorimetry, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.
In first place, calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of heat that a body can receive or give up without affecting its molecular structure. If the molecular structure does not change, the state (solid, liquid, gaseous) does not change. Since the molecular structure does not change, a change in temperature is observed.
In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
Q= 1800 J c= 4.18 [tex]\frac{J}{gC}[/tex] m= 5 g ΔT= ?Replacing in the expression to calculate heat exchanges:
1800 J= 4.18[tex]\frac{J}{gC}[/tex]× 5 g× ΔT
Solving:
1800 J ÷ (4.18[tex]\frac{J}{gC}[/tex]× 5 g)= ΔT
ΔT= 86.12 C
In summary, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.
Learn more:
brainly.com/question/11586486?referrer=searchResults brainly.com/question/24724338?referrer=searchResultsWater is continuously changing state and moving from place to place in the water cycle. This diagram shows these processes and movements. (Bro there's no science AHHHH)
Answer: bro- i have no idea wat science that is but heres the water cycle-
Which phrase describes properties of a solid?
O A. Changing shape and fixed volume
B. Changing shape and volume
c. Fixed shape and volume
D. Fixed shape and changing volume
Please help I’ll give brainlist jut fast please!!!
Answer: fixed shape and volume
Explanation:
i took the quiz so its right
Câu 1: Trình bày phương pháp hóa học nhận biết
a. 3 dung dịch: HCl , Na2SO4 , NaCl.
b. 3 dung dịch:NaOH , NA2CO3 , NaCl.
c. 4 dung dịch:HCl , H2SO4 , NaCl , Na2SO4.
Viết phương trình phản ứng xảy ra (nếu có)
Answer:
c
Explanation:
beacause Câu 1: Trình bày phương pháp hóa học nhận biết
suitable electrolytes for fuel cells
Answer:
Alkaline fuel cells use an alkaline electrolyte such as potassium hydroxide or an alkaline membrane that conducts hydroxide ions rather than protons.
Explanation:
OR USE GATORADE AND POWERADE. BE A MAN.
Help I need them fast pls
Answer:
answer
Explanation:
Ionic bond is a type of chemical bond that attract between oppositely charged ions.
Help with this question which I attached a picture of
[tex]\huge\underline\mathtt\colorbox{cyan}{A. Element L}[/tex]
Explanation:
Because the unidentified element has exactly the same Bright-Line Spectra of wavelength in nanometeres as does element L.
[tex]\huge\bold{\purple{\bold{⚡BeBrainly⚡}}} [/tex]
Identify what the conjugate acid/base would be. FOR H3PO4?
What is the formula for titanium (I) dichromate?
Use proper capitalization.
Enter subscripts as big numbers. For example: Water is entered H2O
What is the pH range for an acid?
0-7
7-14
7
0
Explanation:
If the pH is between 0 and 7, then we have an acid.
If the pH is between 7 and 14, then we have an alkaline base.
If pH = 7, then it's neutral.
Answer:
0-7
Explanation:
Any substance that has a pH of less than 7 is acidic - 0 is a strong acid whereas 6 is a weak acid. A pH of 7 means that the substance is neutral. Anything above pH 7 is alkaline, pH 8 is a weak alkaline and pH 14 is a strong alkaline.Hope this helps!
what is the absolute entropy of a system with only one possible arrangement of its atoms?
A piece of copper alloy with a mass of 85.0 g is heated from 30. °C to 45 °C. In the process, it absorbs 523 J of energy as heat. What is the specific heat of this copper alloy?
plz help me and answer this xx
Answer:
410.196 J/[kg*°C].
Explanation:
1) the equation of the energy is: E=c*m*(t₂-t₁), where E - energy (523 J), c - unknown specific heat of copper, m - mass of this copper [kg], t₂ - the final temperature, t₁ - initial temerature;
2) the specific heat of copper is:
[tex]c=\frac{E}{m*(t_2-t_1)}; \ => \ c=\frac{523}{0.085*(45-30)}=\frac{523}{1.275}=410.196[\frac{J}{kg*C}].[/tex]
Look at the Recording station detector on the upper left side of the Gizmo. What happens when the seismic waves hit the recording station?
Answer:
I don’t know what recording station you’re referring to but, When seismic waves reach the seismograph, a graphical record, or seismogram, is produced
Explanation:
The seismic waves hitting the recording station has been resulted in the seismograph, that has been evident of the earthquake.
The seismic wave has been the radiation, with the result of the movement of the earth surface. The movement has been result in the earthquake.
The intensity of the earthquake has been measured by seismograph on the Richter scale. The seismic wave results in the movement of the leads to the production of the seismograph.
The seismic waves hitting the recording station has been resulted in the seismograph, that has been evident of the earthquake.
For more information about earthquake, refer to the link:
https://brainly.com/question/1296104
how many moles are present in 10.0 grams of sodium hydroxide
Answer:
0.25
Explanation:
no.of moles =10/40
I really need help. Forgot to do m assingment and it's due tomorrow
Answer:
im only good at math
Explanation:
When a substance is heated ,the kinetic energy of its molecules
Answer:
When a substance is heated ,the kinetic energy of its molecules also increase.
Explanation:
K.E is directly proportional to T
8 Fe + S8 → 8 FeS, how many moles of iron (Fe) are needed to react with 8.49 moles of sulfur (S8)?
Based on the balanced equation, the mole ratio of Iron to Sulphur is 8 to 1.
This means that for every mole of sulfur, 8 moles of iron is needed for the reaction.
∴ since the moles of Sulfur = 8.49 moles
⇒ moles of Iron = 8.49 moles × 8
= 67.92 moles