Please help!!
The diagram shows the electron configuration of an atom of an element for the electrons in the s and p orbitals.
What is the group number of the element in the periodic table?
A) 1
B) 2
C) 13
D) 15
Answer:
15
Explanation:
because since the outer shell has 5 electron then add 5 and 10 to get 15
i. Write the dissolution reaction of BaF2, including all states. (0.5 points)
BaF2←>Ba2+(aq)+2F-(aq)
ii. Write the expression for Ksp for BaF2. (0.5 points)
iii. Write the Ksp expression as an algebraic equation, using the variable x to represent concentrations. (1 point)
iv. Find the solubility of BaF2 by solving the equation you wrote in part iii. (0.5 points)
Answer:
See Explanation
Explanation:
i) The equation of the dissolution of BF2 is;
BaF2(s)⇄Ba2+(aq)+2F-(aq)
ii) Ksp =[Ba2+] [2F-]^2
iii) Let the concentration/solubility of [Ba2+] and [2F-] be x
Ksp = [x] [2x]^2
Ksp = 4x^3
iv) x =∛Ksp/4
i have a quiz yall help
How many moles are in a 18 L tank of nitrogen gas at STP?
Answer:
12
Explanation:
i feel like its 12 because moles are medium sized but are they adult moles or baby moles or growing moles
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.803moles of nitrogen gas are there in a 18 L tank of nitrogen gas at STP.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
number of moles of any ideal gas =given volume ÷Volume occupied by one mole of a ideal gas at STP
Volume occupied by one mole of a ideal gas at STP=22.4L
given volume of nitrogen gas= 18 L
substituting all the given values in the above equation we get,
number of moles of nitrogen gas =18 L ÷22.4L
number of moles of nitrogen gas =0.803moles
Therefore, 0.803moles of nitrogen gas are there in a 18 L tank of nitrogen gas at STP.
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What is the mass in grams of 4.8 moles of Calcium Hydroxide?
Answer:
355.2 grams
Explanation:
m = M×n= (40 + 2(16+1))×4.8= 355.2 (g)
A sample of gas has a volume of 12.0 L and a pressure of 2.00 ATM. If the pressure of gas is increased to6.00 ATM, what is the new volume of the gas
Answer:
4L
Explanation:
Which organelles appear to be associated with the nucleus of the animal cell
Answer:
The nucleus is surrounded by the endoplasmic reticulum, which is covered in spots by ribosomes.
Explanation:
When the animal cell divides, the nucleus breaks up, and the nuclear envelope falls apart.
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Can you help me please with my chemistry homework?
How are these two formulas called?
Thank youu
These are structural formulas of constitutional isomers of hexene, an alkene.
Both are acyclic, six-carbon chains, and they differ only in the position of the double bond. As constitutional isomers, both structures have the same molecular formula.
The first structure is of hex-1-ene (or 1-hexene).
The second structure is of (3E)-hex-3-ene [or (3E)-3-hexene].
Both structures have the molecular formula C₆H₁₂.
I hope I answered your question. Please feel free to let me know otherwise.
how many atoms are in 1.6g C? Answer in units of atoms.
(no answer choices were given)
Answer:
6.022 ×10(index 23) / 7.5 = 0.8293 ×10(index 23)
Explanation:
molar mass of C = 12gmol
therefore in 12g of C there is one mole or an amount of 6.022 ×10(index 23)
∴12g/6.02210(index 23) ×1.6g
HELPP asap I’ll mark you as brainlister!!!!!!
is Tungsten carbide an elementary substance
or compound?
Answer:
Tungsten carbide (chemical formula: WC) is a chemical compound (specifically, a carbide) containing equal parts of tungsten and carbon atoms.
Answer:compound
Explanation:
Write a nuclear equation for each description below.
Stronitum-84 combines with an alpha particle, creating sodium-25 and a daughter nucleus. 4 pts
Answer:
Sr-84 + He-2 -> Na-25 + Pm-61
Explanation:
calcium phosphate consists of two ions chemically bonded together. What are charges of each ion?
Answer: Ca^2+ and P^3-
Explanation:
What is the net ionic equation for the following reaction?
Rb2CrO4(aq) + 2AgClO(aq) --> 2RbClO(aq) + Ag2CrO4(s)
Group of answer choices
Rb+(aq) + ClO-(aq) --> RbClO (s)
2Rb+(aq) + CrO42+(aq) --> Rb2CrO4 (s)
Ag+(aq) + ClO-(aq) --> AgClO (s)
2Ag+(aq) + CrO42+(aq) --> Ag2CrO4 (s)
If the sun output of solar radiation increased by 20% how would this impact the temperature of earth's mantle
Answer:
The temperature will not be affected directly
Explanation:
The solar radiation has a direct effect on the outer surface and inner part of the earth but an increase by 20% of the solar radiation will not cause the temperature of the Earth's mantle to increase because the factors that heat up the Earth's mantle are : Friction between core materials that sink into the center of the planet and Heat from decay of radioactive materials
Because the triple beam balance is zeroed before it is put into use, it measures
A.
volume
B.
weight
C.
the effects of gravity
D.
mass
A student placed a solid in a liquid, which produced the results shown in the following diagram.
solid: 20°C
OOO
gas bubbles
liquid: 20°C
1
2
Which of the following MOST likely took place?
A. a chemical reaction
chemical
o
O B. a phase change
C. a nuclear reaction
D. a destruction of mass
The most likely to take place when a solid is placed in a liquid at room temperature ( i.e. 20°C ) is ; ( A ) A chemical reaction
Although your question lacks the required diagram a general answer is provided within the scope of your question
When a solid at 20°C is placed inside a liquid also at 20°C in the laboratory the emergence of gas bubbles shows that there has been a chemical change between the solid and liquid reactant ( i.e. a chemical reaction has taken place ).
Hence we can conclude that what is most likely to have taken place in this situation is a Chemical reaction.
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Can you build a fire on the moon? Why or why not?
Answer:
No.
Explanation:
We can't build a fire on the moon, because moon's atmosphere lacks oxygen.
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No lightning of a fire on the surface of the moon is impossible..
[tex] \huge \green {reasons - }[/tex]
surface of the moon lacks oxygen which is important for the formation of fire.Surface of the moon doesn't have wind which disables the fire to burn rapidly.Science, please help and thank you!!
Calculate the calories of heat required to melt 35.0 g of ice.
Answer:
35.0g of ice at 0 degrees
Explanation:
The greater the difference in EN (electronegativity) between the intramolecular bonding of two atoms, the bond will experience more ionic behavior. A. True b. False
2. A chef fills a 100 ml container with a 83.5 g of cooking oil.
What is the density of the oil?
Density (ρ) = 835 kilogram/cubic meter
Steps:
ρ =
m
V
=
83.5 gram
100 milliliter
= 0.835 gram/milliliter
= 835 kilogram/cubic meter
In this chemical equation which of the following identifies the reactant(s)?
Answer:
2na+o2
Pls mark as brainliest
Answer:
A
Explanation:
2NA + 02
These are your reactants, which are always on the left side of the chemical equation.
hope this helped mark brainliest pls xx
The half-life of 3H (H-3) is 12 years. About how long does it take for 127/128 of a sample of that radionuclide to decay? (Hint: this means only 1/128 are left)
A: 7 years
B:11.9 years
C:84 years
D:12.1 years
Answer:
i do believe its 7
Explanation:
Answer:84
Explanation:
Which is the formula for a binary ionic compound composed of
iodine and sodium?
a Ina
b Either INa or Nal is acceptable.
С
lodine and sodium do not form a binary ionic
compound.
d Nal
Answer:
D. Nal
Explanation:
Took a K12 test and it was correct! :3 Hope this helps!
transmutation occurs during which type of radioactive decay
Explanation:
Transmutation, conversion of one chemical element into another. A transmutation entails a change in the structure of atomic nuclei and hence may be induced by a nuclear reaction (q.v.), such as neutron capture, or occur spontaneously by radioactive decay, such as alpha decay and beta decay (qq. v.).
is an example of a solution that contains a dissolved substance
Answer:
An aqueous solution is water that contains one or more dissolved substances. The dissolved substances in an aqueous solution may be solids, gases, or other liquids.
The urinary bladder is a muscular organ of the excretory system that collects urine excreted by the kidney. How does the nervous system help the urinary system in excretion?
Explanation:
it helps in when the kidney has used the needful nutrients been taken then the unwanted waste product it sends it to the nervous system then the nervous system passes the waste product to the bladder in form of urine
How many atoms are needed to react with 50 grams of O2 gas
Answer:
3 moles
Explanation:
3 moles atoms are needed to react with 50 grams of O2 gas.
Perform the following operation
and express the answer in
scientific notation.
3.60x10-12 + 3.60x10-11
Answer:
3.60X10^-12 is equal to 0.360X10^-11 (move decimal one place left)
Now you can add 3.60X10^-11 and 0.360X10^-11:
3.60X10^-11 + 0.360X10^-11 = 3.96X10^-11
You're really just adding 3.60 to 0.36 since the "X10^-11" is the same for both.
type of ions do acids give off? hydroniumm hydrogen heliumhy dronium and hydrogen
Answer:
Substances that give H + 1 ion when dissolved in water are called acids
Explanation: