Explanation:
A sulfide ion S²⁻ is formed from sulfur atom.
An ion is an atom that has lost or gained electron.
Sulfur atom is made up of 16 electrons according to its position on the periodic table.
In essence, there are 16 negatively charged particles in an atom of sulfur.
Also, in the neutral or uncharged state, the number of electrons equals to the number of protons.
So, there are 16 electrons and protons in an atom of sulfur.
Every atom tends to be like the noble gases. Noble gases have complete octets. So, for sulfur to have a complete octet, it must gain two more electrons to be isoelectronic with Argon. Now, the number of electrons becomes 18;Charge = Number of protons - Number of electrons
Charge = 16 - 18 = -2
Choose the answer that best completes the passage.
The formation of scientific theories is generally guided by the law of ________, which states that the answer requiring the fewest number of assumptions is more likely to be correct.
a. parsimony
b. ideal gases
c. conservation of mass
d. equivalent exchange
a) parsimony/thriftiness
in the image shown above which type of heat transfer is represented by the number 3?
A-conduction
B-convection
C-latent heat
D-radiation
Answer:
Radiation
Explanation:
Radiation is energy that comes from a source and travels through space or heat energy through the air
I hope this helps u..
PLEASE HELP YOU HAVE TO CLICK THE CORRECT ONES PLEASE IM BEGGING YALL IF I FAIL THIS I FAIL MY GRADE....... Directions: Select each correct image. More than one image may be correct.
The diagrams below show interactions between charged particles. The blue particles are negatively charged, and the red particles
are positively charged.
Which of the diagrams shows a correct interaction between the fields of two charged particles?
Answer:
D
Explanation:
Since the negative particles are going towards the negative section and the positive particles are leaving the positive section. Additionally, opposite charges attract each other and like charges repel each other.
There will be attraction between the opposite charges and repulsion among the like charges. Here the diagram D shows a correct interaction between the fields of two charged particles.
What is a electric field?The electric force acting per unit charge is defined as the electric field. They are generally produced by changing the electric charges or magnetic fields. The electric field strength is expressed in volt per meter (V/m).
E = F/Q
In an electric field it is the electric charge which provides the direction of field. If the charge is negative, then the field is directed towards the charge. A field is directed away from the charge if the charge is negative.
All the electric fields start form a positive charge and end on a negative charge. If two positive charges interact then there will be repulsion between them. But if a positive charge interact with a negative charge then there will be attraction among them.
In diagram D there is an attraction between the opposite charges.
Thus the correct option is D.
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What is the mass in grams of 1.95 moles of water
Answer:
35.1 grams H2O
Explanation:
Using the molar mass of water (18.016 g/mol):
1.95 mol H2O * (18.016 g H2O / 1 mol H2O) = 35.1312 g H2O --> 35.1 g H2O (with sig figs)
How many atoms of Na would be in 2.53 moles of Na?
Answer:
15.24 × 10²³ atoms
Explanation:
Given data:
Number of atoms of Na = ?
Number of moles of Na = 2.53 mol
Solution:
1 mole contain 6.022× 10²³ atoms.
2.53 mol × 6.022× 10²³ atoms / 1mol
15.24 × 10²³ atoms
The number 6.022 × 10²³ is called Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
BONUS: SHOW D.A. SETUP AND CORRECT ANSWER FOR +2 POINTS
A Troy High School senior has a goal of getting accepted at 10 colleges. Her counselor explained that with the excellent grade she received in AP chemistry she would probably be accepted to one school out of every three to which she applied. She immediately realized that for each application she would have to write 3 essays, and each essay would require 2 hours work. Of course writing essays is no simple matter. For each hour of serious essay writing, she would need to expend 500 calories that she could gain from eating her mother's apple pies. Each apple pie contains 1000 calories. How many pies would she have to eat in order to gain acceptance to 10 colleges?
Answer:27
Explanation:
Took the test
Answer:
30 slices of pie
Explanation:
10 colleges = 30 essays
30 essays= 60 hours of work
60 hours = ( 500*60)
30,000 calories expended = 30 slices of pie
I wouldn't recommend eating that much pie.
what is the most reactive alkali metal?
Answer:
Na, soudium
Explanation:
also Fr Francium.
is palladium a metal nonmetal or metalloid
Answer: metal i believe
Explanation:
Answer:
It is a rare and lustrous silvery-white metal
Explanation:
Which need, want value, or interest was most likely involved in the
development of the device shown?
A. A lack of parking spaces for cars
B. A way to read license plates from afar
C. A safe and fair driving environment
D. A well-funded police department
PREVIOUS
Answer: C
Explanation:
What is the name of this molecule?
.A student sets up a controlled experiment to test whether aluminum bats hit baseballs further than wooden bats. After measuring the distance travelled by hundreds of struck baseballs, by both high school and professional players, he concludes that wooden bats hit baseballs further because professional players use wooden bats and hit the ball much further than high school players who use aluminum bats.
Where is the flaw in his approach?
The flaw in his approach or his flaw is that he used professional players and high school players this makes the experiment uncontrolled because the players are at two levels of strength.
What was the experiment done by a student to test aluminum bats hit baseballs further than wooden bats?A student sets up a controlled experiment to test whether aluminum bats hit baseballs further than wooden bats. After measuring the distance travelled by hundreds of struck baseballs, by both high school and professional players.
He concludes that wooden bats hit baseballs further because professional players use wooden bats and hit the ball much further than high school players who use aluminum bats. If aluminum bats were permitted for use in baseball then a lot of teams would begin to use them instead. This would reduce the demand for wooden bats and lead to their prices falling.
Therefore, The flaw in his approach or his flaw is that he used professional players and high school players this makes the experiment uncontrolled because the players are at two levels of strength.
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PLSS HELPPP ILL GIVE 30 POINTS PLSS its for a test plss
SHORT ANSWER QUESTION: Include a Claim, Evidence, Explanation, and Conclusion for full credit.
Cells were obtained from a patient with a viral infection. The DNA extracted from these cells consisted of two forms: double-stranded human DNA and single-stranded viral DNA. The base composition of these two forms of DNA are shown in the image.
Construct an argument based on evidence to determine which form was the viral DNA and which form was the human DNA.
(5 Points)
Answer:
I am sorry but this is cheating you have to come up with your own answer
Explanation:
PLEASE HELP DUE NOW
how many valance electrons do all of the elements under carbon have?
The following is NOT an example of a behavior:
Buying a lottery ticket
Jumping rope
Doing a 60 second plank
Making the decision to buy a lottery ticket
Answer:
making the decision to buy a lottery ticket
Explanation:
all the others are q result of a thought........whereas the last one is actually one of the thoughts
Which material is the medium of ocean waves?
A. Sand
B. Air
C. Rock
D. Water
Answer:
Its D. Water
Explanation:
hope this helps :)
Choose the correct missing coefficient to balance the following equation:
___H2 + O2 ---> 2H2O *
1
2
3
4
Answer:
2
Explanation:
because it helps to balance the equation
Answer:
2
Explanation:
We want to balance the equation. On the right, there are 4 hydrogens, and 2 oxygens. We should have the same amount on the left.
For hydrogens, we want 4. 2 *2 =4,
Therefore, the answer is 2
I hope this helps! :)
Which of the following will have a larger radius than zinc ? Gallium (Ga) Magnesium (Mg) Aluminum (Al) Strontium (St)
Answer:
Strontium (St)
Explanation:
The atom that will have a larger radius than zinc is strontium, Sr.
Atomic radius is defined as the half of the inter-nuclear distance between two covalently bonded atoms of non-metallic elements or half of the distance between two nuclei in the solid state of metals.
Across the period atomic radii decreases progressively due to the increase in nuclear charge. Down a group atomic radii increase progressively due to the successive shells of electrons being added. Since strontium satisfies the criteria, it has the larger atomic radius.Considering the definition of atomic radius, the atom that will have a larger radius than zinc is strontium, Sr.
The atomic radius represents the distance between the nucleus and the valence shell, which is the outermost shell. By means of the atomic radius it is possible to determine the size of the atom.
But the size of the atom or atomic radius is not an easy parameter to determine, since the electrons are not located in defined orbits, at fixed distances from the nucleus, but rather move chaotically in areas of space where the probability of finding the electron is greater than 90%.
Therefore, the atomic radius is considered as half the distance that separates two neighboring nuclei.
By increasing the atomic number of the elements in a group, that is, by going down in a group, the number of occupied levels is increased. Consequently, the atomic radius increases.
On the other hand, the atomic radius decreases as you advance through a period. This is due to the fact that when advancing in a period, while the number of electron shells remains the same, the positive charge of the nucleus increases due to the increase in the atomic number, that is, the number of protons, which have a positive charge. This causes the electrons to move closer to the nucleus, thus decreasing the radius.
In summary, in the groups, the atomic radius increases with the atomic number, that is to say downwards, while in the periods it decreases with increasing Z, towards the right.
Since strontium satisfies the criteria explained previously, it has the largest atomic radius.
Finally, the atom that will have a larger radius than zinc is strontium, Sr.
Learn more:
https://brainly.com/question/4302027?referrer=searchResultshttps://brainly.com/question/11371316?referrer=searchResultsHow does the strength
of the force effect the
velocity of the object?
Answer:
nertial mass is a measure of how difficult it is to change the velocity of an object. Example. Calculate the force needed to accelerate a 22 kg cheetah at 15 m/s².
Explanation:
how many moles of H2O will be required to make 17.6 moles of O2
Answer:
1 mole
Explanation:
A mole of water molecules contains 2 moles of hydrogen atoms and 1 mole of oxygen atoms.
Which group/family contains elements with the smallest radius within the same period?
Answer:
Halogens
Explanation:
From the given choices, the halogens will have the smallest radius within the same period.
The size of an atom is estimated by the atomic radius. This is taken as half of the inter-nuclear distance between two covalently bonded atoms of non-metallic elements or half of the distance between two nuclei in the solid state.
Across a period in the periodic table, atomic radii decrease progressively from left to right. Down a group from top to bottom, atomic radii increase progressively due to the addition of successive shells.Since halogen is the right most group from the choices given, it will have the smallest radius.
Which of the following could be the rate equation for a first order reaction? please help this is timed
Rate = k[A] = first order reaction
Further explanationGiven
Rate law
Required
A first-order reaction
Solution
The rate law : equation for the rate of chemical reaction
For reaction
aA + bB ⇒ C
The rate : r = k[A]ᵃ[B]ᵇ
The sum of exponents(a+b) is the reaction order
From the choice :
a. a+b = 2, second order reaction
b. a+b = 3, third order reaction
c. a+b = 4, fourth order reaction
d a+0 = 1, first order reaction
Name the salts formed:
1. Magnesium + Nitric Acid
2. Calciuni + Hydrochloric acid
3. Zinc + Sulfuric acid
4. Iron + Sulfuric acid
5. Copper + Nitric Acid
Answer:
1)magnesium nitrate +hydrogen
2)calcium chlorine+hydrogen
3)zinc sulfate +hydrogen
Explanation:
hope it helps
what is the electron configuration of Zn+
A. [Ar] 3d10
B. [Ar] 4s2 3d10
C. [Ar] 4s2 3d9
D. [Ar] 4s1 3d10
Answer:
A.
Explanation:
Its [Ar] 3d¹⁰4s²
How many moles of water are needed in order to produce 218 g of calcium
hydroxide?
Cacz + 2H2O -------> CH2 + Ca(OH)2
0.59 moles
111 moles
30 moles
0.15 moles
Answer:
-------> CH2 + Ca(OH)2
0.59 moles
111 moles
30 moles
0.15 moles
How many liters of air must react with 2500 mL of hexane in order for combustion to occur completely. The percentage of oxygen in air is 20.9%.
Answer:
118750 ml
Explanation:
The chemical equation for complete combustion of hexane is given as;
2C6H14 + 19O2 → 12CO2 + 14H2O
From the equation of the reaction;
2 mol of C6H14 reacts with 19 mol of O2
2 ml of C6H14 reacts with 19 ml of O2
2500 mL of C6H14 would react with x ml of O2
2 = 19
2500 = x
x = 2500 * 19 / 2 = 23750 ml
Since oxygen is 20% of air;
23750 = 20 / 100 * (Volume of air)
Volume of air = 23750 * 100 / 20 = 118750 ml
can someone answer this question on electrolysis please
37 POINTS for the BRAINLIEST
Answer:
There are two electrodes in an electrolysis solution: the positive and the negative electrode. The reaction that happens at each electrode is different. ... Positively charged ions (metals and hydrogen), are attracted to the negative electrode (the cathode), where they receive electrons (a process known as oxidation).
Explanation:
A half equation is used to represent the reaction that happens at an electrode during electrolysis . It shows what happens when ions gain or lose electrons .
hope this helps ^^
science help me please :))
Answer:
There will be 2 nitrogen and 2 oxygen atoms in the product.
Explanation:
In a chemical reaction, atoms are neither created or destroyed, which means if there are 2 nitrogen atoms in the reactants, there will be 2 nitrogen atoms in the products. Similarly, if there are 2 oxygen atoms in the reactants, there will be 2 oxygen atoms in the products.
Let me know if this helps!
True or False. If a fire destroyed all of the grass in a grassland, this would NOT affect the biodiversity of this ecosystem.
Answer:
This is false
Answer:
100% false
Explanation:
common sense
What does this quote mean to you?
"You may need to fight a battle more then once to win."
Explanation:
I think it means that even if you dont succeed at something the first time you do it doesn't mean you sould give up.
A sample of water contains 5.24 x 1022 molecules. How many moles are in this sample?
Answer:
0.087 moles of water
Explanation:
Given data:
Number of molecules of water = 5.24×10²² molecules
Number of moles of water = ?
Solution:
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules of water
5.24×10²² molecules × 1 mol / 6.022 × 10²³ molecules
0.87×10⁻¹ mol
0.087 mol