Answers
Answer:
c. Cl
Explanation:
Related Questions
What is the yearly exposure from wearing a watch with a luminous dial?
Answers
Hope this helps
Which animals/insects look different from their young?
Answers
An atom has 9 protons and 7 electrons. What is its overall charge?
Answers
Answer:
Positive
Explanation:
If an atom has more protons than electrons, its overall charge will be positive. Protons have a positive charge, electrons have a negative charge.
Atoms of which element have the most valence electrons?
O A. Neon (Ne)
O B. Chlorine (CI)
O C. Nitrogen (N)
O D. Oxygen (0)
Answers
Explanation:
neon has 8valence electrons
chroline has 7 valence electrons
nitrogen has 5 valence electrons
oxygen has 6 valence electrons
so neon has the most valence elctrons
Explain why atoms increase in size when the atom gains electrons.
Answers
Hope it helps
PLEASE HELP DUE BY FEB 4TH PLEASE HELP PICTURE IS ATTACHED
Answers
Answer:
4. is the troposphere
5. is the lithosphere
6. is the hydrosphere
7. this would be lithosphere (land), hydrosphere (water), biosphere (living things) and atmosphere (air)
8. this would be the goesphere and atmosphere.
note: hope this helps :)
how many moles of sodium chloride are in a 122 gram sample
Answers
what are ions and how do they work please send me answer
Answers
Answer:
hope it helps
please mark me brainliest
Explanation:
An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule. An atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.
A process that releases heat, such as freezing or condensation is called?
Answers
Answer:
exothermic
Explanation:
An exothermic reaction gives off heat energy. Condensation is the process by which water vapor turns into liquid water. This typically occurs when water vapor molecules come into contact with cooler molecules. This causes the water vapor molecules to lose some energy as heat which is a exothermic reaction.
When water becomes a solid, it releases heat, warming up its surroundings. This makes freezing an exothermic reaction.
2. In the space below, describe why it rains. Include the words that scientists use
when talking about how water changes from liquid to gas and back to liquid
again
Answers
9 of 16
9.
A student drops a ball from 5 feet above the ground. After bouncing once, it only reaches
a maximum height of 4 feet above the ground.
Use energy terms to explain why the ball did not reach its original height after bouncing
once.
A. Some energy was lost
B. Some energy was transferred to the floor and air
C. Some energy disappeared when it hit the floor
D. Some energy was destroyed
Answers
The energy would have been lost to the atmosphere as sound energy or heat energy as the ball hit the floor.
A compound has a percent composition of 24.74% potassium (molar mass = 39.10 g/mol), 34.76% manganese (molar mass = 54.94 g/mol), and 40.50% oxygen (molar mass = 16.00 g/mol).
Assuming that the mass of the compound is 100 g, what is the compound’s empirical formula?
Answers
Answer: KMnO4
Explanation:
BRAINLIST!!
A river flowing through a floodplain shapes the region through the processes of weathering, erosion, and deposition. Which of the following is an example of the river forming a depositional feature?
A.
As the water's speed increases, it scours deep grooves in the muddy river bottom.
B.
As the water flows along the outside edge of a curve, it removes rock and soil from the river bank.
C.
As the water's speed decreases along the inside edge of a curve, sediment is laid down to form a point bar.
D.
all of these
Answers
Answer:
B
as the flows along the outside edge of a curve it removes rock and soil from the river bank
Car 1 has a body made from aluminium and car 2 has a body made from steel. Which car is likely to
have the better fuel economy?
Answers
Answer:
1
Explanation:
Um well if a car is made out aluminum keep in mind the engine = heat and stuff the type of stuff that would burn would cause chemicals/ white flame to form the trioxide aluminum(lll) oxide, Al small 2 O small 3. With Steel this would burn off bits of rust/ion oxide
I could be wrong but thats the best answer i can give sorry mate
Which of the following atoms could an alkaline earth metal (family 2) form an ionic bond with? Sulfur Argon Sodium
Explain your answer. __________________________________________________________
_______________________________________________________________________________
Answers
Answer:
Sulfur (but not argon or sodium.)
Explanation:
In an ionic bond, one atom would completely lose one or more electrons while the other atom would completely gain those electrons.
For that to happen, the first atom needs a strong tendency of losing electrons. The second atom needs a strong tendency of gaining electrons.
Atoms of metals tend to lose electrons. On the other hand, atoms of nonmetals tend to gain electrons.
Alkaline earth metals (IUPAC group [tex]2[/tex]) include elements such as magnesium and calcium. Like many other metals, alkaline earth metal atoms tend to lose electrons. Atoms of elements that form ionic bonds with alkaline earth metal atoms should tend to accept electrons.
Among the choices for the other element in this ionic bond:
Sodium is an alkaline metal. Sulfur is an IUPAC group [tex]6[/tex] non-metal. Argon is a noble gas.Because sodium is a metal, it is unlikely that sodium would accept electrons from alkaline earth metal elements. Rather, sodium might form an alloy (with metallic bonds rather than ionic bonds) when melted and mixed with alkaline earth metals.
Sulfur is a non-metal and is right under oxygen in group [tex]6[/tex] of the periodic table. Like atoms of other nonmetals in that group, sulfur atoms tend to gain electrons and could readily form ionic bonds when mixed with alkaline earth metal elements.
Argon is a noble gas. Noble gas elements are considerably chemically inert. They seldom react with other elements. Even if they do so, they tend to form covalent bonds rather than ionic bonds. In practice, alkaline earth metals such as calcium may even be stored in containers filled with argon to prevent the metal from reacting with oxygen in the air.
Chemical reaction type
Al2(co3) al2o3 +
Answers
Type of reaction : The decomposition reaction
Further explanationGiven
Reaction
Al₂(CO₃)₃ → Al₂O₃ + 3CO₂
Required
Type of reaction
Solution
The decomposition reaction in a chemical reaction shows the decomposition reaction of a compound into its constituent elements or compounds
So 1 compound breaks down into 2 or more compounds
The general formula :
AB ⇒ A + B
Could someone help?
All forces require an input of ______
- mass
- energy
- speed
- atoms
Answers
Answer:
Mass
Explanation:
I majored on Chemistry
Answer:
Mass
Explanation:
All forces require an input of mass
A hydrobromic acid (HBr) solution has a molar concentration of 0.055 M, Calculate the and pH of the solution. (Remember that Kw= 1.0x10-14M2.)
A) [H3O+]= 5.5x10-2M, [OH-]=1.82x10-13M, pH=1.26
B) [H3O+]= 3.8x10-13, [OH-]=2.6x10-2M, pH=12.42
C) [H3O+]= 4.8x10-3, [OH-]=1.6x10-12M, pH=9.2
D) [H3O+]= 1.0x10-8 [OH-]=1.0x10-6M, pH=8.0
E) cannot be calculated with the information given
Answers
Answer: Im not sure but i think its B
Explanation: Its hard to explain so im
not gonna do it
Taking into account the definition of strong acid, pH and pOH, it is obtained that the correct option is option A) [H₃O⁺]= 5.5×10⁻² M, [OH⁻]= 1.82×10⁻¹³ M, pH= 1.26
It is called strong acid, that acid that dissociates completely in solution at constant temperature and pressure. Under these conditions, the concentration of a strong acid is equal to the concentration of hydrogen ions (Hydronium or H₃O⁺). In other words, a strong acid is an acid that completely dissociates into hydrogen ions and anions in solution.
Hydrobromic acid HBr is a strong acid, so a concentration of 0.055 M of the acid generates a H₃O⁺ concentration of the same value. This is:
[HBr]= [H₃O⁺]= 0.055 M= 5.5×10⁻² M
On the other hand, pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance. Mathematically it is calculated as the negative logarithm in base 10 of the activity of hydrogen ions:
pH= -log [H₃O⁺]
Being [H₃O⁺]= 5.5×10⁻² M, the pH in this case is:
pH= -log (5.5×10⁻² M)
Solving:
pH= 1.26
Similarly, pOH is defined as the negative base 10 logarithm of the activity of the OH⁻ ions:
pOH= - log [OH⁻]
The following relationship can be established between pH and pOH:
pH + pOH= 14
Then, being pH = 1.26, the pOH is calculated by:
1.26 + pOH= 14
pOH= 14 - 1.26
pOH= 12.74
Replacing in the definition of pOH:
12.74= - log [OH⁻]
and solving you get:
[OH⁻]= 1.82×10⁻¹³ M
Finally, the correct option is option A) [H₃O⁺]= 5.5×10⁻² M, [OH⁻]= 1.82×10⁻¹³ M, pH= 1.26
Learn more about pH and pOH with this example: https://brainly.com/question/13423425?referrer=searchResults
i need help please this is due today
Answers
Dennis’ speed: 60 ft/0.5 secs = 120 ft per sec
Johnny’s speed: 60 ft/0.45 secs = 133.333 ft per sec
Travis’ speed: 60 ft/0.52 secs = 115.38 ft per sec
Michael’s speed: 60 ft/0.48 secs = 125 ft per sec
As you can see, Johnny’s speed is the fastest at 133.333 ft/sec.
How many elements are in this chemical formula?
2(NH4)2SO4
Your answer
Answers
Answer:
4
Explanation:
Nitrogen (N)
hydrogen (H)
sulfur (S)
oxygen (O)
please answer the (a)
Answers
Answer:
a) 30
b) 45
Explanation:
A company needs a substance for a new product that is a good electrical insulator, is lightweight, and can withstand high pressures. Which type of scientist should the company contact for help? Choose the correct answer.
geophysicist
organic chemist
material scientist
analytical chemist
Answers
The company should contact with a material scientist to better know which materials can provide the needs that they demand. Hence option c is correct.
Who are material scientists ?The chemical composition and structure of many man-made and natural materials are investigated and analyzed by materials scientists. In order to learn more or acquire new information, glass, rubber, ceramic, alloys, polymers, and metals are all explored and investigated.
Using what they have learnt, materials scientists then come up with methods to mix materials, reinforce existing materials, or develop whole new materials with specific features and characteristics for usage in a variety of applications and products.
A materials scientist develops techniques for evaluating certain materials to find out how they react to various environmental factors. They also design laboratory tests to assess the plausibility of methods and processes used to produce novel materials with enhanced properties.
Therefore, the company have to contact a material scientist.
Find more on material science:
https://brainly.com/question/14478715
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The weight of a box having a mass of 100 kg is N.
Answers
Explanation:
weight= mass* 9.8N
100 kg mass weighs about 980 Newtons on Earth.
1. Electronegativities of the elements Be, Mg, Ca, and Sr follow a specific trend within their group. Based on this trend, the atoms of which element will have the least attraction for an electron?
A) Be.
B) Mg.
C) Ca.
D) Sr.
2. Which element has a larger atomic radius than sulfur?
A) Chlorine.
B) Cadmium.
C) Fluorine.
D) Oxygen.
3. Which ion was formed by providing the second ionization energy to remove an electron?
A) Ca2+.
B) N3–.
C) Fe3+.
D) S2–.
4. The most negative electron affinity is most likely associated with which type of atoms?
A) Large nonmetal atoms.
B) Small nonmetal atoms.
C) Large metal atoms.
D) Small metal atoms.
5. Selected properties of antimony (Sb) and iodine (I) are listed in the table below.
Element AtomRadius(pm) 1st IonEnergy(kJ/mol) ElectroAffinity(kJ/mol) Electronegative
Sb 145 ? –103 2.05
I 140 1008 –295 ?
Which predictions can most likely be made?
Sb has a lower ionization energy but a higher electronegativity than I.
Sb has a higher ionization energy but a lower electronegativity than I.
Sb has a lower ionization energy and a lower electronegativity than I.
Sb has a higher ionization energy and a higher electronegativity than I.
6. Which correctly summarizes the trend in electron affinity?
A) It tends to be very high for group 2.
B) It tends to be more negative across a period.
C) It tends to remain the same across periods.
D) It tends to be more negative down a group.
7. Which explains the change in ionization energy that occurs between removing the first and second electrons from an atom?
A) The ionization energy decreases because the ratio of the protons to electrons increases.
B) The ionization energy increases because the ratio of the protons to electrons increases.
C) The ionization energy decreases because the ratio of the protons to electrons decreases.
D) The ionization energy increases because the ratio of the protons to electrons decreases.
8. Which element would most likely have an electron affinity measuring closest to zero?
A) Na.
B) Al.
C) Rb.
D) Ar.
9. Electronegativities of the elements Na, Al, P, and Cl follow a specific trend across the period. Based on this trend, an electron will be most strongly attracted to
A) Na.
B) Al.
C) P.
D) Cl.
10. Which best describes ionization energy?
A) Energy needed to add an electron to a neutral atom in the gas phase.
B) Energy needed to add an electron to a neutral atom in the liquid phase.
C) Energy needed to remove an electron from an atom or ion in the gas phase.
D) Energy needed to remove an electron from an atom or ion in the liquid phase.
Answers
Answer: B D B A C B E D A B
Explanation:
According to kelper, which planet travels the fastest.
1. Earth
2. Jupiter
3. Mercury
4. Neptune
Answers
Fill in the blank with the correct number to balance the equation 4Cr +3O2 -> CR2O3 (enter only a whole number)
Answers
Answer:
The balanced equation is given below:
4Cr + 3O₂ —> 2Cr₂O₃
Explanation:
From the question given above the following equation was obtained
4Cr + 3O₂ —> Cr₂O₃
The equation can be balance as illustrated below:
4Cr + 3O₂ —> Cr₂O₃
There are 4 atoms of Cr on the left side and 2 atoms on the right side. It can be balance by writing 2 before Cr₂O₃ as shown below:
4Cr + 3O₂ —> 2Cr₂O₃
Now the equation is balanced.
Which of the following materials has the highest density?
A. O water vapor
B. O steam
C. O liquid water
D. O ice
Answers
Answer:
Answer is C. liquid water.
Explanation:
I hope it's helpful!
Liquid water has the highest density. Therefore, the correct option is option C among all the given options.
What is density?The density of a substance is defined just like its weight per unit volume. In other words, density is the mass-to-volume ratio or mass for every unit volume. It quantifies how much "stuff" a thing possesses in an unit volume (cubic meter or cubic centimeter).
Density is a measure of how closely stuff is packed together. The density principle was established by the Greek scholar Archimedes, which is simple to compute if one know the equation and its associated units. Lquid water has the highest density.
Therefore, the correct option is option C among all the given options.
To learn more about density, here:
https://brainly.com/question/29775886
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Which of the following would support the theory that electrons are identical for all elements?
Answers
Answer:
what are the following?
Which of the following is a problem caused by acid rain?
1 -is a factor in global warming
2-causes depletion of the ozone layer
3-respiratory problems in humans
4-makes lakes and streams unsuitable aquatic life
Answers
Answer:
1
Explanation:
is a factor in global warming
Answer:
sulfur dioxide from coal fired plants in Tennessee
Explanation:
Got it right on the quiz :)
O energy flowing from the
krill to the blue whale
What is the form of energy that the blue whale consumes when it eats the point
krill that helps it survive?
thermal
radiant
Chemical
Answers
Answer:
thermal
Explanation: