Answer:
Every element in a given group has the same number of valence electrons. For elements in the main groups (1-2, and 13-18), the number of valence electrons increases when moving from left to right along any period (row). The noble gases contain a full valence electron shell, which consists of eight electrons.
Explanation:
Hope this helps.
Answer:
Valence Electrons
Explanation:
Say you are looking at a neutrally charged carbon atom, it has 6 electrons. The first electron shell can hold 2 electrons. The next can hold 8, the next can hold 8 and the next can hold ten and so on... Well in the Carbon atom case, it has 6 electrons, 6-2 is 4, so the carbon atom at 4 valence electrons, which actually helps it in making organic molecules, which in turn also helps make something you might have heard of before, organisms, the best example being, humans
What's the study of earth and its atmosphere ?
Answer:
Meteorology is the science dealing with the atmosphere and its phenomena, including both weather and climate
Answer: Meteorology I believe
Explanation:
Formic acid, from the Latin formica, is the acid present in ants sting. What is the
concentration of HCOO" at equilibrium if the initial concentration of formic acid,
HCOOH, is 1.35 M (Kg = 1.7 x 10-4).
For the reaction of deprotonation of formic acid, the concentration of HCOO⁻ at equilibrium is 0.0151 M if the initial concentration of formic acid is 1.35 M.
The reaction of deprotonation of formic acid is the following:
CHOOH + H₂O ⇄ HCOO⁻ + H₃O⁺
At the equilibrium we have:
CHOOH + H₂O ⇄ HCOO⁻ + H₃O⁺ (1)
1.35 - x x x
The acid equilibrium constant for this reaction is:
[tex] K_{a} = \frac{[HCOO^{-}][H_{3}O^{+}]}{[CHOOH]} = 1.7 \cdot 10^{-4} [/tex] (2)
Entering the values of [CHOOH] = 1.35-x, [HCOO⁻] = [H₃O⁺] = x, into equation (2) we have:
[tex] 1.7 \cdot 10^{-4} = \frac{[HCOO^{-}][H_{3}O^{+}]}{[CHOOH]} = \frac{x^{2}}{(1.35 - x)} [/tex]
[tex]1.7 \cdot 10^{-4}(1.35 - x) - x^{2} = 0[/tex]
After solving the above quadratic equation and taking the positive value for x (concentrations cannot be negative), we have:
[tex] x = [HCOO^{-}] = [H_{3}O^{+}] = 0.0151 M [/tex]
Therefore, the concentration of HCOO⁻ at equilibrium is 0.0151 M.
Learn more about the equilibrium constant here:
https://brainly.com/question/7145687?referrer=searchResultshttps://brainly.com/question/9173805?referrer=searchResultsI hope it helps you!
Describing Rock Texture
Which are examples of a phase change? (Select all that apply.)
melting chocolate
frying bacon
baking bread
freezing water
Answer:
It is melting chocolate and freezing water.
Explanation:
If your melting melting chocolate it would turn into a liquid and if you freeze
water then you are turning liquid to a solid.
Melting chocolate and freezing water are the examples of phase change.
What do you mean by phase change?A phase change is a change in the states of matter. For example, a solid may become a liquid. This phase change is called melting. When a solid changes into a gas, it is called sublimation.
A phase transition is the physical process of transition between one state of a medium and another. Commonly the term is used to refer to changes among the basic states of matter: solid, liquid, and gas.
There are eight thermal processes through which matter can attain phase change. They are melting, freezing, evaporation, condensation, sublimation, deposition, ionization, and recombination.
Learn more about phase change:
https://brainly.com/question/30270780
#SPJ2
Explain how conditions in the mantle crate a conventional current
Answer:
As the warmer material rises, it also cools, eventually pushed aside by warmer rising material and sinking back toward the core. Mantle material flows slowly, like thick asphalt or mountain glaciers. While the mantle material remains solid, the heat and pressure allow convection currents to move the mantle material
PLEASE HELP ME WITH THIS I ONLY HAVE 8 MINUTES I will give you extra points . NUMBER 6
Answer:
3 mass instincts. If you look at the scale you can they evenly sometimes line up with a line. Whenever a huge instinct occurred the lines were really high, but whenever they were little instincts on the scale the lines would go down
Explanation:
19. When you cut an apple in half. What type of change has occurred?
A.
Ichemical
C.
temporary
B.
physica
D.
reactive
Answer:
Physical
Explanation:
Nothing has chemically happened and the change is permenant therefore it is physical
convert 5.65 x 10^26 atoms of phosphorus to moles
Answer:
938.54 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
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
[tex]n = \frac{5.65 \times {10}^{26} }{6.02 \times {10}^{23} } \\ = 938.5382[/tex]
We have the final answer as
938.54 molesHope this helps you
Why are iron oxides in rocks evidence for prehistoric photosynthesis? (1 point)
o Iron oxides form when carbon dioxide, a reactant of photosynthesis, is in the atmosphere.
o Iron oxides form when cyanobacteria use carbon dioxide for photosynthesis.
o Iron oxides form when cyanobacteria produce oxygen via photosynthesis.
o Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere.
Answer:
Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere.
Turn on "Show formula". What is the formula of this compound?
Answer:
you can find the answer in this link
https://www.coursehero.com/file/p4kfbhi5/B-Turn-on-Show-formula-What-is-the-formula-of-this-compound-Li2O-C-Turn-on-Show/
how do you use an enchantment table in mine-craft. Please actually answer.
Answer:
You place an enchantment ta ke then you place a weapon or armor and press enchant. I hope this helps
Explanation:
Answer:
Depends on what you need to enchant
Explanation:
You can enchant any tools or armor if you put lapis in the box with a symbol and you have enough exp which will show up next to the enchantment you can enchant those and you can also enchant any normal books that way
The Density equation is:
Answer:
p=m/v
p equals density M equals mass and v = volume
What particles would you find in a nucleus of an atom
Answer:
The nucleus is a collection of particles called protons, which are positively charged, and neutrons, which are electrically neutral. Protons and neutrons are in turn made up of particles called quarks. The chemical element of an atom is determined by the number of protons, or the atomic number, Z, of the nucleus.
Why does the velocity of catalyzed reaction reach maximum at certain
concentration of enzyme?
Answer:
Because the total energy of the enzyme has been used up and actions already complete
Explanation:
Catalyst are substance known to speed up rate of chemical reaction just like taking a short pathway. When velocity of catalyzed reaction reach maximum, at that moment reaction has reach it full potential (there is an equilibrium in reaction). there won't be any changes on further addition, and mostly indicate that Reaction is Complete
How deep is the real pond?
A. 24 cm
B. 63 cm
C. 18 cm
D. 7 cm
Answer:
24
Explanation:
The average size of most ponds is 10′ x 15′ (roughly 150 square feet) with the deepest point being 24″. If you have underwater shelves for plants they usually go 12″ down.
- BRAINLIEST answerer ❤️✌
draw a conclusion a weather balloon carries sensing instruments very high altitudes to detect weather information. a weather balloon is filled near earth's surface with a low density gas. describe what happens to the particles the pressure, and the volume inside the balloon as it rises.
Answer:
im sorry the answer if i did i would
Explanation:
Which is a strong base?
A. HCl
B. NaOH
C. NH3
D. H3CO3
Answer:
c
Explanation:
Answer:
B
Explanation:
If 8.0 g of sulfur dioxide came in contact with a cloud containing 2.2 g of oxygen, indicate the
Limiting Reactant and calculate the theoretical yield (in grams) of sulfur trioxide produced.
Answer:
Limiting reactant= SO₂, Theoretical yield = 9.6g SO₃
Explanation:
The first step is is to find the limiting reactant; you do this using stoichiometry.
The reactant that produces the smallest amount of sulfur trioxide SO₃, is the limiting reactant.
In this problem, SO₂ is the limiting reactant.
Now to find the theoretical yield we will use the smallest value of SO₃.
I have uploaded a picture to better illustrate the problem and hope it helps.
What quantity is needed to convert between the moles of a
given sample of a substance and its mass in grams?
a the molar mass of the substance
b the density of the substance
C the physical state of the substance
ht?
d all of the above
Answer:
d
Explanation:
thanks so much to you welcomeeee for me and my brother in the same situation and he does it for a year of life in your relationship
At this location, it is winter because the North Pole is tilted
Towards the sun
Away from the sun
Answer:
Away from the sun
Explanation:
winter
In the Northern Hemisphere, winter generally begins on December 21 or 22. This is the winter solstice, the day of the year with the shortest period of daylight. Summer begins on June 20 or 21, the summer solstice, which has the most daylight of any day in the year.
6Na(s) + N2(g) --> 2Na3N(s)
Answer:
80.0 g Na and 20.0 g N2.
Explanation:
This means the limiting reactant determines the maximum mass of the product formed.
Reya is a neuroscientist who studies behaviors in mice. She is working on a project in which the mice are given a snack when they push a small button on the wall of their enclosure. At first, the mice don't understand
the connection between thebutton and the snack. In time, they leam to push the button whenever they want a snack. Reya's experiment an example of what type of conditioning?
A. operant
B. classical
C. magical
D. phantom
Answer:
It should be operant.
Explanation:
The mouse is associating a voluntary behavior in order to recieve the outcome, which is the snack.
Please help me!! I will literally pay you if you do my one aleks topic due tomorrow!! I have multiple example problems. It’s same Q different numbers
Answer:
I'll do it if you give brainlyest and some points
Please answer please
Answer:
1k km
Explanation:
The table describes some characteristics of a layer of earth
Which layer is described by the data in the table?
crust
mantle
outer core
inner core
Answer:
crust .......
.........
Explain why “advancing water contact angles are more sensitive to the hydrophobic property of a surface whereas receding water contact angles are more sensitive to the hydrophilic property of a surface”.
Answer: Surface tension has a more complicated effect on capillary pressure: on the one hand, capillary pressure is directly proportional to surface tension. High surface tension liquids, on the other hand, typically have higher contact angles, which lowers capillary pressure.
Explanation: Does this help??
Calculate the heat produced by hydrolysis of 65 kg of ATP (the molecular weight of ATP is 507.18 g/mol).
The heat produced by hydrolysis of 65 kg of ATP is -6.8 kJ.
Let's consider the thermochemical equation for the hydrolysis of ATP.
ATP + H₂O ⇒ ADP + Pi ΔG = -57 kJ/mol
We will convert 65 kg of ATP to moles using its molecular weight (507.18 g/mol).
[tex]65 \times 10^{3} g \times \frac{1mol}{507.18g} = 1.2 \times 10^{2} mol[/tex]
57 kJ of heat are released by the hydrolysis of 1 mole of ATP. The heat released by the hydrolysis of 1.2 × 10² moles of ATP is:
[tex]1.2 \times 10^{2} mol \times \frac{(-57kJ)}{1mol} = -6.8 \times 10^{3} J = -6.8 kJ[/tex]
-6.8 kJ is the heat produced by hydrolysis of 65 kg of ATP.
Learn more: https://brainly.com/question/13056741
Describe how you will separate suspension from colloidal solution?
Answer:Unlike those in a suspension, particles in a colloid do not separate when sitting still. The particles in a suspension may be separated by filtration unlike those in a colloid. Colloids are able to scatter light, but suspensions cannot transmit light
how do you determine the total number of Valence electrons that are used to make a particular lewis structure for a compound or an ion?
Answer:
The number of valence electrons of an element can be determined by the periodic table group (vertical column) in which the element is categorized.
Explanation:
Hope it helps!
What are some key properties of metalloids?
Explanation:
Metalloids have a solid state of matter. In general, metalloids have a metallic luster. Metalloids have low elasticity, they are very brittle. Middleweight are semi conducted elements, and they allow leave the average transmission of heat.