We have that
the Carbon isotopes represents a pair of isotopes
12C, 14COption B
From the question we are told
Which of the following represents a pair of isotopes?
A. Ca+2, Be+2 B. 12C, 14C C. Fe+2, Fe+3 D. 7N, 8OGenerally
Isotopes
This is defined as variant forms of an element with variant atomic mass but same proton number
Therefore
the Carbon isotopes represents a pair of isotopes
12C, 14C
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Which is not an example of an element ?
Answer:
include all compounds.
Answer:
CO2 is a pure compound
Explanation:
Element non examples include all compounds, which are substances made when two different types of atoms form a chemical bond. Any material made by mixing elements is no longer an element. Anytime you see a chemical formula with more than one element symbol in it, it's an element non example.Pure elements are Substances which are made up of only one kind of atom. Air is a mixture of element and compound whereas alcohol in water is a mixture of compounds. CO2 is a pure compound and not an element.
pls help me i have to turn this in in less than 15 min.
Answer:
Last one
Explanation:
Answer:
Boiling point!
Explanation:
Distilled water is capable of being heated beyond the normal boiling point due to absence of dissolved impurities which provide nucleating points at the normal boiling point.
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True/False The atoms of a gas are the most tightly packed of the 3 states of matter.
Answer:
false
Explanation:
because solid is the most tightly packed out of gas and liquid .
When does the shape of a molecule affect its polarity?
A. When the molecule contains ionic bonds
B. When the molecule contains polar bonds
C. When the molecule contains hydrogen bonds
D. When the molecule contains nonpolar bonds
Answer:
B When the molecule contains polar bonds.
Explanation:
AP-EXpert
The shape of a molecule affect its polarity, when the molecule contains polar bonds because polarity depends on polar bonds.
What is the effect on polarity?The polarization of a molecule greatly depends on the shape of the molecule. The net dipole moment occurs only due to the uneven distribution of electrons between the two atoms.
So we can conclude that the shape of a molecule affect its polarity, when the molecule contains polar bonds because polarity depends on polar bonds.
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how does tungsten most common isotope relate to the average atomic mass of the element
Answer:
It has the most quantitative effect on the average atomic mass of the element.
Explanation:
Tungsten's most common isotope will have the most quantitative effect on the average atomic mass.
The most common isotope of tungsten will represent its most abundant isotope.
The proportion by which each element occurs in nature is the geonormal abundance. The geonormal abundance is used to calculate the average atomic mass.The isotope with the most geonormal abundance will have the highest effect on the average atomic mass of an element.
Which surface will most likely cause a rolling ball to slow down?A.grassB.iceC.tile
Answer:
grass
Explanation:
ice and tile are smooth and without any bumps or large ridges, unlike grass which is spiky and flexible. grass will most likely slow down a ball that is rolling, unlike answer choices B and C.
Answer:
grass
Explanation:
ice and tile are bothe a flat surface where grass has texture
Based on the oxidation states of the atoms in this reaction, answer the questions. 4Fe(0) + 3O2(0) → 2Fe2(3+)O3(2-) How many electrons does the iron half-reaction lose? How many electrons does the oxygen half-reaction gain? What is the total number of electrons that are moved in this oxidation-reduction reaction?
Answer:
Twelve electrons
Explanation:
If we look at the product side, we will notice that iron lost twelve electrons and oxygen gained twelve electrons.
Hence, we have 4Fe^3+ and 2O3^2- showing twelve electrons lost/gained.
Answer:
How many electrons does the iron half-reaction lose?
12
How many electrons does the oxygen half-reaction gain?
12
What is the total number of electrons that are moved in this oxidation-reduction reaction? 12
Explanation:
Will give.brainliest.
the pH scale describes the negative log of the percent _____
ion in a solution
Answer:
The pH of a solution is the negative logarithm of the hydrogen-ion concentration. The pH of pure water or any neutral solution is thus 7.00.
Explanation:
Answer:
hydrogen concentration
Explanation:
Mary discovered that the cell membrane of a bacteria acts like a fence because it keeps some things in and other things out.
A. Observation
B. Analogy
C. Inference
Mary walked into her room where her little son was playing, found a broken window, and thought immediately that her son had broken it.
A. Observation
B. Analogy
C. Inference
Mary noticed that her counter top was warm to the touch.
A. Observation
B. Analogy
C. Inference
Mary noticed that the side walk was wet and thought that it may have been that the sprinklers had been on recently.
A. Observation
B. Analogy
C. Inference
Mary counted and recorded 20 heart beats in 10 seconds.
A. Observation
B. Analogy
C. Inference
The lecturer compared the human eye to a camera lens.
A. Observation
B. Analogy
C. Inference
Answer:
1. B
2. C
3. A
4. C
5. A
6. B
Explanation:
An analogy can be defined as a cognitive process which typically involves comparing things having similar characteristics or features for the purpose of explanation or clarification. An observation can be defined as a process which typically involves carefully monitoring something for the purpose of understanding and clarity. An inference can be defined as a cognitive process which involves reaching a conclusion or forming an opinion based on sets of evidence or reasoning.1. Mary discovered that the cell membrane of a bacteria acts like a fence because it keeps some things in and other things out: this is an analogy because there's a comparison between the cell of a bacteria and a fence.
2. Mary walked into her room where her little son was playing, found a broken window, and thought immediately that her son had broken it: this is an inference because she immediately thought her son broke it.
3. Mary noticed that her counter top was warm to the touch: this is an observation which was based on an evidence of touch.
4. Mary noticed that the side walk was wet and thought that it may have been that the sprinklers had been on recently: this is an inference because it was based on her thoughts.
5. Mary counted and recorded 20 heart beats in 10 seconds: this is an observation because she actually counted her heart beats.
6. The lecturer compared the human eye to a camera lens: this is an analogy because it was a comparison between a human eye and a camera lens.
3. An object has a mass of 20.0 grams and a volume of 5.0 cubic centimeters. Give the
density
density= mass/ volume
d= 20/5
d= 4 g/cm^3
What are two things with the same volume but different masses?
Answer:
an ice cube and paper cube with the same dimensions
Explanation:
an example is an ice cube and a cube with the same dimensions made of paper. these have the same volume, but different masses because the particles are packed differently and in different amounts.
I don't understand how and why some transition metals form more than one ions eg: copper forms two. PLS EXPLAIN. I WILL GIVE YOU BRAINLIEST.PLS EXPLAIN PROPERLY AND IN FULL DETAIL. I AM IN YEAR 9.
THANKYOU
USE COPPER OXIDE IONS AS AN EXAMPLE.
7-8 POINTS
Answer:because some have more radiation than others causing mutations and there for either decreasing or increasing the amount of ions
copper is a acidic metal in general therefor it will most likely erode faster than any other metal making it hard to determan the number of ions in general the metal will have basicly what I’m trying to say is there is no solid answer as many metals can change there ions for no given reason
Explanation:
I need help please answer
Where do the glucose molecules that our cells need come from?
Answer:
glucose molecules that our cells need from is plants
How can two objects of different masses have the same temperature but different amounts of thermal energy?
Leann is learning about chemical reactions. She wants to create a model of a chemical reaction, so she is examining the information that she should include. What are the different components that she should include in her model? Choose the three that apply.
A. the kinds of atoms that form during a reaction
B. the kinds of molecules involved in the reaction
C. the kinds of elements that make up a molecule
D. whether the molecules are products or reactants
E. whether the products have more mass than the reactants
Which of these particles is the smallest?
A.a proton
B.a nucleus
C.an electron
D.an atom
Answer:
an atom. It is the smallest thing known to man kind
Explanation:
Answer:
C
Explanation:
so basically, we can eliminate some answer choices right away.
an atom (answer choice D) is made up of all the other answer choices, so that is the largest (not the answer).
a nucleus (answer choice B) is made up of protons (answer choice A) and neutrons which means it is not the smallest either (not the answer).
now, we are left with a proton and an electron. electrons are much smaller than protons, so they are usually not included in an element's atomic mass. therefore, an electron is the smallest out of these answer choices.
Why are some isotopes stable and others not stable
Answer: Many elements have one or more isotopes that are radioactive. These isotopes are called radioisotopes.
Answer:
Many elements have one or more isotopes that are radioactive. The isotopes are called radioisotopes
NEED ANSWER ASAP!! I would really aprecitate it! Please.
Explanation:
Positron..............Write the orbital notation for element 53.
Answer:
Its complete electron configuration is 1s22s22p63s23p64s23d104p65s24d105p5.
Explanation:
Pesticides are a type of wastewater
pollutant.
True
False
Find the average atomic mass of smithium ?
Answer:
google friend tell me
Explanation:
You will have to look up the isotopic distribution of lithium nuclei. ALL lithium nuclei have 3 positively charged nuclear particles, protons, i.e. Z = 3 . These 3 particles give rise to the element's identity. If you take the weighted average of ALL lithium nuclei, we get an average mass of 6.941 g⋅mol−1
At $2.186/gallon, how many pennies would it cost to buy 125 L of gasoline? (1 gallon =
128 oz, 1 oz= 29.6 mL)
PLS HELPPPP
Answer : The cost of pennies to buy 125 L of gasoline would be, $71.92
Explanation :
As we are given that the cost to buy gasoline is $2.186/gallon.
Now we have to determine the cost to buy 125 L of gasoline.
First we have to convert 125 L into gallon.
Conversion used:
(1 gallon = 128 oz, 1 oz= 29.6 mL, 1 mL = 0.001 L)
As, 1 L = 1000 mL
So, 125 L = 125000 mL
and,
As, 29.6 mL = 1 oz
So, 125000 mL = [tex]\frac{125000mL}{29.6mL}\times 1oz=4222.9oz[/tex]
and,
As, 128 oz = 1 gallon
So, 4222.9 oz = [tex]\frac{4222.9oz}{128oz}\times 1\text{ gallon}=32.9\text{ gallon}[/tex]
Now we have to determine the cost to buy 125 L of gasoline.
As, the cost of 1 gallon of gasoline = $2.186
So, the cost of 32.9 gallon of gasoline = $2.186 × 32.9
= $71.92
Therefore, the cost of pennies to buy 125 L of gasoline would be, $71.92
The heat required to raise the temperature of 12g of water from 16 C to 21 C is:
What is the correct electron configuration for the ion K+?
1s22s22p63s23p6
1s22s22p63s23p64s1
1s22s22p63s23p64s2
1s22s22p63s1
Answer:
1s22s22p63s23p6
Explanation:
The electronic configuration of K is 1s22s22p63s23p64s1.To form K+1 we remove electron. Thus the electrons configuration of K +1 is 1s22s22p63s23p6.
Hence answer is option A
How many atoms are in 1.9 g C? Answer in units of atoms.
Answer:
9.5E22
Explanation:
(1.9/12.011)×6.02E23
what is a group that does not change and represents a normal pattern of response
Answer:
Constant
Explanation:
Trust
What do you do if your friends hate you ex that you secretly dating again and you promised not to date him again but you i love him?
Answer:
this is what I personally feel.
Explanation:
it depends on ex . If he is a a hole ,not trustworthy, or is a negitive person,Then yeah i understand what they are coming from. Another is that is also on your end. if you keep going back to a person that is on you . if he isnt treating you right, then listen to them !! . Youll find someone that knows your worth :) . I hope this helped . have a nice day <3
Newton’s third law of motion included which terms?
The change of state in which a solid becomes a liquid is called ______. a liquefaction b melting c condensation d sublimation
What happens when the number of particles in an atom is changed
Answer:
When the number of particles, though in this case I think you mean (electrons), changes in an atom....it become an ion. Ions are atoms that were chnaged by losing or gaining an electron. If an atom gains an electron it will have a negative charge. If an atom loses an electron it will have a positive charge. Hope this was helpful!!
Explanation:
