Answer:
Periodic table
Explanation:
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The concentration of [OH-] -hydroxide ion : 1.2 x 10⁺⁴ M
Further explanationH₂O ionization reaction
2 H₂O ⇌ OH− + H₃O⁺
The water equilibrium constant (Kw) is the product of concentration
the ions:
Kw = [H₃O +] [OH-]
Kw value at 25° C = 10⁻¹⁴
It is known [H₃O +]=8.4 x 10⁻¹¹ M
then the concentration of [OH-] -hydroxide ion :
[tex]\tt 10^{-14}=8.4\times 10^{-11}\times [OH^-][/tex]
[tex]\tt [OH^-]=\dfrac{10^{-14}}{8.4\times 10^{-11}}=1.19\times 10^{-4}\approx 1.2\times 10^{-4}[/tex]
why are there more hours of daylight during the summer
Answer:
Because of daylight savings
Answer:
because during the summer is when the earth is tilted a certain one. But because in different places they get summer at a different time the earth tilts differently for the places around the world.
Explanation:
1. Determine the number of significant figures in the following measurements.
a. 38.7 g 3 significant figures
b. 3 486 002 kg 7 significant figures
c. 0.00013 cm
d. 0.001400 g/L
e. 9 740 000 nm/s
Answer:
2 and 4 and 3
Explanation:
in c. leading 0's are never significat. Numbers 1-9 are always significant.
d. leading 0's are never significant. numbers 1-9 are always significant. ending 0's are only significant when there is a decimal.
e. numbers 1-9 are always significant. 0's are not significant because there is no decimal.
Electronegativity difference of F and Cl:
ionic
covalent
Answer: Electronegativity difference of F and Cl: 1.0 and is covalent
Explanation:
Answer:
1.0, covalent
Explanation:
Electronegativity difference of N and H:
0.9
covalent
Electronegativity difference of F and Cl:
1.0
covalent
Which two properties of an object are directly related to its thermal energy?
A. Velocity and weight
B. Mass and weight
C. Velocity and temperature
D. Mass and temperature
Answer:
The answer is C
Explanation:
If we assume the sum of energy that could be obtained by absolutely transforming a unit of length, m. It is compared to the speed of light in this connection. In this case, the whole mass of the electron becomes force. In this, depending on the relation of Einstein, each electron can generate 510 keV, which is why only the option of "c" is right.
dose someone like to talk and will you help me to, if not we can talk
Answer:
wsppp
Explanation:
Answer:
hi.. (:
Explanation:
Which of these is a physical property? boiling point ,flamability, reactivity , toxicit
Answer:
Boiling point.
Explanation:
Flammability, reactivity and toxicity are all chemical properties!
This represents the composition of a substance expressed as a percent.
Answer:percent composition
Explanation:
what is the molar mass of tin (II) sulfate?
Answer:
214.77 g/mol
Explanation:
Tin(II) sulfate
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Tin(II) sulfate
Tin(II) sulfate crystallizes in an heavily distorted barium sulfrate structure.
Unit cell of tin(II) sulfate.
Names
Other names
Stannous sulfate
Identifiers
CAS Number
7488-55-3 ☑
3D model (JSmol)
Interactive image
ChemSpider
21106484 ☑
ECHA InfoCard 100.028.457 Edit this at Wikidata
EC Number
231-302-2
PubChem CID
62643
UNII
0MFE10J96E ☑
CompTox Dashboard (EPA)
DTXSID20884389 Edit this at Wikidata
InChI[show]
SMILES[show]
Properties
Chemical formula SnSO4
Molar mass 214.773 g/mol
Appearance white-yellowish crystalline solid
deliquescent
Density 5.15 g/cm3
Melting point 378 °C (712 °F; 651 K)
Boiling point decomposes to SnO2 and SO2
Solubility in water 33 g/100 mL (25 °C)
Structure[1]
Crystal structure Primitive orthorhombic
Space group Pnma, No. 62
Lattice constant
a = 8.80 Å, b = 5.32 Å, c = 7.12 Å[2]
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamond
010
Flash point Non-flammable
Lethal dose or concentration (LD, LC):
LD50 (median dose) 2207 mg/kg (oral, rat)
2152 mg/kg (oral, mouse)[3]
Related compounds
Other anions Tin(II) chloride, tin(II) bromide, tin(II) iodide
Other cations Lead(II) sulfate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Tin(II) sulfate (SnSO4) is a chemical compound. It is a white solid that can absorb enough moisture from the air to become fully dissolved, forming an aqueous solution; this property is known as deliquescence. It can be prepared by a displacement reaction between metallic tin and copper(II) sulfate:[4]
Sn (s) + CuSO4 (aq) → Cu (s) + SnSO4 (aq)
Tin(II) sulfate is a convenient source of tin(II) ions uncontaminated by tin(IV) species.
Plants contain three types of tissue. Describe the function of each. What are the tissues made of?
Each plant organ (roots, stems, leaves) contains all three tissue types: ... Vascular tissue is made of two specialized conducting tissues: xylem and phloem. Xylem tissue transports water and nutrients from the roots to different parts of the plant, and also plays a role in structural support in the stem
PLEASE MARK ME AS BRAINLIEST
A balloon holding a 3.0 L volume of gas at sea level is suddenly
released by the child holding it. The balloon travels upwards until the
pressure around the balloon is 0.60 atm. Assuming isothermal
conditions, the new volume inside the balloon would be
Answer:
If you know your gas laws, you have to utilise a certain gas law called Charles' Law:
V
1
T
1
=
V
2
T
2
V
1
is the initial volume,
T
1
is initial temperature,
V
2
is final volume,
T
2
is final temperature.
Remember to convert Celsius values to Kelvin whenever you are dealing with gas problems. This can be done by adding 273 to whatever value in Celsius you have.
Normally in these types of problems (gas law problems), you are given all the variables but one to solve. In this case, the full setup would look like this:
2.75
291
=
V
2
318
By cross multiplying, we have...
291
V
2
= 874.5
Dividing both sides by 291 to isolate
V
2
, we get...
V
2
= 3.005...
In my school, we learnt that we use the Kelvin value in temperature to count significant figures, so in this case, the answer should have 3 sigfigs.
Therefore,
V
2
= 3.01 L
Explanation:
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Answer:
6L im not completly sure but i wouldnt risk it
Explanation:
Which has a lower freezing point oxygen or ethanol
Answer:
Oxygen
Explanation:
i REALLY think it is
Which equation shows the correct relationship between mass, force, and acceleration?
A
equation 1
B
equation 2
C
equation 3
D
equations 1, 2, and 3
The acceleration on an object is proportional to the resultant force and inversely proportional to the mass of the object
Further explanationNewton's 2nd law explains that the acceleration produced by the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object
∑F = m. a
[tex]\large {\boxed {\bold {a = \frac {\sum F} {m}}}[/tex]
F = force, N
m = mass = kg
a = acceleration due to gravity, m / s²
Newton's equation shows that the greater the net force applied to an object, the greater the acceleration, conversely the greater the mass of the object, the smaller the object's acceleration.
You can use this principle to choose the available answer options, because the questions are not complete
Explain why iodine will not displace bromine from seawater.
Blonde hair is a dominant trait. (True or flase)
Answer:
False
Explanation:
Answer:
false
Explanation:
D. liquid
18. Which one is the oxidizing agent in the following reaction?
CuO + H2 cu + H2O
A. Cuo
B. H2
C. Cu
D. H2O
Answer: H2O
Explanation: The given balanced chemical reaction is,
This reaction is a reversible reaction.
The rate of forward reaction will be,
The rate of backward reaction will be,
And at equilibrium the rate of reaction is equal to the rate of backward reaction divided by the rate of forward reaction.
Help ASAP.................
Sebastian has a beaker of 100 ml of water and a beaker of 500 ml of water. He is trying to
determine how the boiling point will be affected by the different amounts of water. He knows
that boiling point is a physical property of matter. What can he conclude about the boiling
point of the 2 beakers of water?
A. The 2 beakers of water will have different boiling points because the boiling point of water
is a physical property and the property is independent of the amount of water.
B. The 2 beakers of water will have the same boiling points of 100 degrees Celsius because
the boiling point of water is a physical property and the property is independent of the
amount of water.
C. The 2 beakers of water will have different boiling points because the boiling point of water
is a physical property and the property is dependent of the amount of water.
D. The 2 beakers of water will have different boiling points of 100 degrees Celsius and 500
degrees Celsius because the boiling point of water is a physical property and the property
Answer:
The 2 beakers of water will have different boiling points because the boiling point of water is a physical property and the property is independent of the amount of water.
Explanation:
Got 100 on my test
Why does the s orbital fill before the p orbitals?
A. The s orbital is lower in energy than the p orbital.
B. The s orbital holds fewer electrons than a p orbital.
C. The s orbital belongs to a different energy level than the p orbital.
D. The s orbital is higher in energy than the p orbital.
Answer: A. The s orbital is lower in energy than the p orbital
Explanation: Just did test
The S-Orbital fill before the p-orbital Because, The s-orbital is lower in energy than the p-orbital. Hence, Option (A) is correct.
What is Afbau principle?The aufbau principle, from the German Aufbauprinzip, also called the aufbau rule, states that in the ground state of an atom or ion, electrons fill subshells of the lowest available energy, then they fill subshells of higher energy.
For example, the S subshell is filled before the P subshell is occupied.
Therefore, The S-Orbital fill before the p-orbital Because, The s-orbital is lower in energy than the p-orbital. Hence, Option (A) is correct.
Learn more about Energy here ;
https://brainly.com/question/1932868
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What is the density of an object, and what is an example of density?
a ridged steel tank filled with 62.7L of nitrogen gas of 85.0L atm
The final gas pressure : 175.53 atm
Further explanationMaybe the complete question is like this :
A ridged steel tank filled with 62.7 l of nitrogen gas at 85.0 atm and 19 °C is heated to 330 °C while the volume remains constant. what is the final gas pressure?
The volume remains constant⇒Gay Lussac's Law
When the volume is not changed, the gas pressure in the tube is proportional to its absolute temperature
[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]
P₁=85 atm
T₁=19+273=292 K
T₂=330+273=603 K
[tex]\tt P_2=\dfrac{P_1\times T_2}{T_1}\\\\P_2=\dfrac{85\times 603}{292}\\\\P_2=175.53~atm[/tex]
How many moles of KCl are contained in this solution?
0.486 L of a 2.0 M KCl solution
Answer:
0.972mol
Explanation:
Given parameters:
Volume of Solution of KCl = 0.486L
Molarity = 2.0M
Unknown:
Number of moles of KCl in solution = ?
Solution:
To find the number of moles of KCl in this solution, use the expression below;
Number of moles = molarity x volume
Insert the parameters and solve;
Number of moles = 0.486 x 2 = 0.972mol
Boiling Point is the __________. *
temperature at which a liquid boils and turns to a gas
temperature at which a liquid boils and turns to a solid
temperature at which a liquid becomes warm
temperature at which a liquid freezes
Cations have positive charges. Anions have negative charges. What force draws the two together?
Answer:
electrostatic attraction
Explanation:
Electrostatic attraction refers to the electrostatic force of long-range interaction occurring between the attractive electrostatic adsorption in aqueous solution with differently charged particles or uncharged particles.
Answer: Electrostatic attraction.
Explanation:
Which of the following would be considered a compound?
He
CI
NaCl
B
Answer:
NaCl
Explanation:
because He which is helium gas its an element alone,
Cl which is chlorine is a single element,
B which is Boron and its a single element,
but NaCl which is simply called table sugar is the combination between Na, sodium and Cl, chlorine , so its called a compound not an element.
Atoms and elements are examples of
Answer:
A particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons. An element is a substance that is made entirely from one type of atom. For example, the element hydrogen is made from atoms containing just one proton and one electron.
Draw the best Lewis structure of [(CH3)3O]+; fill in any nonbonding electrons. Calculate the formal charge on each atom other than hydrogen. Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons and any nonzero formal charges.
Answer:
Following are the solution to this question:
Explanation:
For [tex][(CH_3)_3O]^{+}[/tex]
Please find the attachment.
Calculating the formal charge[tex]= ve^{-} - (nb +\frac{b}{2})[/tex]
[tex]ve^{-} = valence\ electons\\\\nb=non \ bonding \ electrons\\\\b= bonding \ electrons[/tex]
Formal charge on [tex]C \ of \ CH_3 \ \ \ \ (1)[/tex]
[tex]= 4- (0+\frac{8}{2})\\\\= 4- (0+4)\\\\=4-4\\\\=0[/tex]
Similarly, the formal charge on all carbons atoms is = 0
The formal charge on O atom:
[tex]=6-(2+\frac{6}{2})\\\\=6-(2+3)\\\\=6-5\\\\=+1[/tex]
5) Titanium (11) oxide is produced from its elements
HELPPPP!!! I NEED HELP WITH SCIENCE
Answer:
Both are chemical changes.
Explanation:
They are chemical changes because when when you melt the sugar to make caramel a new substance is formed. The same with cookies. You don't start out with cookies, you start out with dough. And then when you cook the dough a new substance is formed which is the cookies.
16. Analysis of a sample of a covalent compound showed that it contained 14.4% hydrogen and 85.6% carbon by mass. What is the empirical formula for the compound?
Answer:a
Explanation: