Answer:
An element with 1only one valence electron is extremely reactive while an element with 8 valence electrons is very stable and does not react most of the times
Explanation:
Valency is the number of electrons in the outermost shell of the atom. It shows the ease with which elements react and combine with each other.
An element can take a maximum of 8 electrons in most of its outermost shells. As a matter of fact, the goal for its stability is to attain a structure with all 8 slots for electrons in its outer shell filled up. The element can either do this by adding or removing electrons.
The ease with which it adds or removes the electrons shows its reactivity. If it has only one electron to lose, (the valence electron) the element will be very reactive because this is relatively easier to do when compared with 2 electrons, three electrons, and so on. An element with 8 electrons in its outer shell is very stable and does not need to react anymore. an example of this is Neon and Argon.
I really need the help in anyway...
Answer:
What substance changed physically under all three condition? Copper Wire
What substance changed chemically under all three condition? Steel Wool
What evidence indicates a chemical reaction is occurring? New gases are produced; A phase change has occurred; A color change
Select the three answers that are examples of a chemical reaction. The mixing of an acid and base shows an increase in temperature; after baking bread there is a new odor or smell; when hair is bleached it changes to a lighter color
Which data supports this inference? Baking soda dissolving; A gas formed, creating bubbles
Which experiment best shows evidence of energy being released in a chemical reaction? Heat and light are given off when paper is burned
Which experiment likely resulted in the formation of a precipitate? Two solutions are mixed together and a yellow solid forms
The BEST evidence for a chemical reaction is the formation of a new substance.
Explanation:
2. When heat and light are being given off, energy is being released. Paper burning is a chemical reaction b/c when paper is burnt, it is a new substance and the act can't be undone.
3. When a yellow solid forms, that solid is the participate.
4. You will for sure have a chemical reaction if a new substance is created.
5. Copper wire changed physically b/c the copper wire can be returned to its original condition in all of these situations and no new substance was formed. Steel Wool changed chemically b/c it can't be returned to its original state under any condition and new substances were formed every time.
6. New substances formed indicate a chemical reaction. A color change also is an indication of a chemical reaction.
7. When a substance can't be turned into its original position or a new substance is produced, a chemical reaction occurred.
Write a balanced molecular, ionic, and net ionic equation for the following reaction. Assume the reaction occurs in
aqueous solution.
Na2Co3(aq)+FeCl,(aq) to
FeCo3(s) + NaCl(aq)
balanced:
Ionic Equation:
Net Ionic Equation:
Answer: The balanced molecular equation is:
[tex]Na_2CO_3(aq)+FeCl_2(aq)\rightarrow 2NaCl(aq)+FeCO_3(s)[/tex]
The ionic equation is:
[tex]2Na^+(aq)+CO_3^{2-}(aq)+Fe^{2+}(aq)+2Cl^-\rightarrow 2Na^+(aq)+2Cl^-(aq)+FeCO_3(s)[/tex]
The net ionic equation:
[tex]Fe^{2+}(aq)+CO_3^{2-}(aq)\rightarrow FeCO_3(s)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The balanced molecular equation is:
[tex]Na_2CO_3(aq)+FeCl_2(aq)\rightarrow 2NaCl(aq)+FeCO_3(s)[/tex]
Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.
The ionic equation is:
[tex]2Na^+(aq)+CO_3^{2-}(aq)+Fe^{2+}(aq)+2Cl^-(aq)\rightarrow 2Na^+(aq)+2Cl^-(aq)+FeCO_3(s)[/tex]
The ions which are present on both the sides of the equation are sodium and chloride ions. and hence are not involved in net ionic equation.
The net ionic equation:
[tex]Fe^{2+}(aq)+CO_3^{2-}(aq)\rightarrow FeCO_3(s)[/tex]
what is the percent composition of a mixture of 5.12g of O and 1.54g of N
Answer:
no lo sé bb 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100
LEVEL 1
Codes Answers
Answer:
That would be codes unregonizable
Explanation:
Zora wants to dissolve a solute in a solvent quickly. Which best describes what she should do?
decrease the pressure
decrease the surface area
shake it repeatedly
place in a refrigerator
Answer:
C shake it repeatedly
Explanation:
i think thats the answer if not sorry hope it helps you.
Answer:
C.
Explanation:
Between the two elements Neon (Ne) and Silicon (Si) which is more stable explain your reasoning?
Answer:
Neon is a gas and silicon is a solid i solved this for my chemistry teacher dr Thomas project this week
Explanation:
gasses are naturally less stable then non metalloids
Please answer correctly nobody answers questions like this on brainly. BTW ITS STEM.
Which of the following choices describes an accurate relationship?
Descriptive research typically follows from explanatory research
Experimental research may lead to understanding descriptive research
Case study research typically follows from descriptive research
Observational research may lead to understanding explanatory research
Answer:
I believe your answer is B. Experimental research may lead to understanding descriptive research.
Generally, experimental research is a trial and error method that tests the hypothesis of descriptive research. Descriptive research being the theoretical or studied characters of a topic.
Please let me know if I had this wrong, and I'll do some extra research for you.
Martha ran 420 m, and Cole ran 60 m less than Martha. The distance Kate ran is right in the middle of Martha and Cole's distances. How far did Kate run?
Answer:
390 m
Explanation:
Martha ran 420 m
Cole ran 60 m less than Martha = 420 m - 60 m = 360 m
The distance Kate ran is right in the middle of Martha and Cole's distances
Kate distance = (420 + 360) / 2 = 780 / 2 = 390 m
What is the chemical formula for nickel (III) oxide, I know the answer but can someone explain how you would get it?
Answer:
the answer is d.
1. Write the symbols for each element.
2. Find the charge for each element using the Periodic Table. Write it above each element. (because there is a (III) after nickel, the charge of nickel is +3. oxygen is in group 16, which means it has a -2 charge.)
3. See if the charges are balanced (if they are you're done!)
- when you criss cross (getting Ni2O3, the charges are canceled out, so the equation is balanced.
if you still need help or if this is confusing, look up How to Write the Formula for Nickel (III) oxide by Wayne Breslyn on YT.
Answer:
D.) Ni2O3
Explanation:
edge 2021 (just needed the daily answer)
The diagram shows a position (person) on Earth at 3:00 a.m. What is likely to happen to that position (person) in 12 hours? Select the best answer.
A. It will remain stationary.
B. It will rotate and be in the sun.
C. It will rotate and return away from the sun.
B.It will rotate and be in the sun.
_____ grams = 9.3 kilograms
Answer:
9300 grams = 9.3 kilograms hope it helps
Study the image. Warm and cold air fronts with points labeled 1 through 4. 1: cold air entering from the left and moving down. 2: clouds with rain. 3: warm air entering from the right and moving up. 4: warm air entering from the top left and moving down toward the clouds. Warm and cold air fronts with points labeled 1 through 4. 1: cold air entering from the left and moving down. 2: clouds with rain. 3: warm air entering from the right and moving up. 4: warm air entering from the top left and moving down toward the clouds. At which point is cool air circulating beneath warm air? 1 2 3 4
Answer:
1
Explanation:
Warm and cold air fronts with points labeled 1 through 4, cold air entering from the left and moving down. Therefore, the correct option is option 1.
What is air?The term "air" is used to refer generally to the concoction of gases that composes the Earth's atmosphere. Nitrogen makes up the majority of this gas (78%), with oxygen, water vapor, argon, carbon dioxide, and trace gases also present.
There is no color or smell in pure air. Dust, pollen, and spores are common airborne contaminants; additional pollutants are alluded to as "air pollution." Since there isn't air in space, the so-called air on another planet, like Mars, would have different manufacturer. Warm and cold air fronts with points labeled 1 through 4, cold air entering from the left and moving down.
Therefore, the correct option is option 1.
To know more about air, here:
https://brainly.com/question/7671110
#SPJ6
hhhhhhhhhhhheeeeeeeeeeelllllllllllllppppppp
Answer:i dont even know myself :p
Explanation:
6. A car is driving in a large circle at a constant speed of 20 miles per hour. Is the car accelerating? How do you know?
The car is not accelerating, because the car is driving at a constant speed of 20 miles per hour.
You are planning to buy a car. The cool blue car gets 24 miles to the gallon, while the hip red gets 14 km to the liter. Which car gets the better gas mileage?
When developing a product such as cookware specific heat well as health cost and ease of use our important factors to consider one of the materials tested which is the best suited for cookware and why explain based on safety/health cost specific heat and ease of use
Answer:
In short, the thermal conductivity of a material is how readily that material absorbs and transmits (releases) energy. When the fire or heating element of a range comes in contact to a pan, the energy from the heat source is transmitted to the pan. This increases the internal kinetic energy of the pan (commonly called "heating up"). The heated material then transmits the energy to nearby materials that are at a lower average molecular kinetic energy level (at a lower temperature than the material). The higher the thermal conductivity of the material, the faster it will heat up and also, the faster the heated area will spread to unheated areas of the same piece of material.
For example, if we placed a large sheet of stainless steel (fairly low thermal conductivity as cooking materials go) on a burner and turned on the burner, the area directly under the burner would get hot while the rest of the sheet slowly heats up. The burner imparts heat quickly only to the region of steel directly over it. The rest of the pan heats up from the conduction of the heat from that spot. When the outer edges of the sheet have reached a hot temperature, the spot directly over the burner would be extremely hot. The figure below shows an example of the temperature of the sheet of steel over a gas burner. The hottest parts are shown in white, hot is red and cool is blue.
Explanation:
No explanation hope i'm not wrong
Whats the correct answer ??
Answer:
creo que es R no se puede ser
Home can use ____to distribute warm air from a sunroom
Answer:
Solarpannels? I honestly don't know I'm just trying to be helpful.
Which family group on the peirodic table has the most elements
a. metals
b. nonmetals
c. trainsiton elements
d. metalloids
Answer:
C. Transition metals
Explanation:
Out of the answers transition metals have the most elements on the periodic table.
HELP !!!!!!!!!!!!! PLEEEAAAAASSSSSSEEEE
Why does heating an object increases its thermal energy?
Answer:
the average kinetic energy of its particles increases. When the average kinetic energy of its particles increases, the object's thermal energy increases. Therefore, the thermal energy of an object increases as its temperature increases.
Part 1)
One reaction that produces hydrogen gas can be represented by the unbalanced chemical equation- Mg(s) + HCl(aq) −→ MgCl2(aq) + H2(g).
What mass of HCl is consumed by the reaction of 3.15 mol of magnesium?
Answer in units of g.
Part 2) What mass of MgCl2 is produced? Answer in units of g.
Part 3) What mass of H2 is produced? Answer in units of g.
Answer:
Part 1: 229.95g
Part 2: 598.5g
Part 3: 12.6g
Explanation:
Note: I learned this last week. Answer not sure.
Pls tell me if i got it right or wrong.
Mg + HCl - > MgCl2 + H2
First, balance the equation.
There is only 1 H and 1 Cl at the left side. BUT there are 2 Cl and 2 H at the right side. So you can add a 2 in front of HCl to balance it.
Mg + 2HCl - > MgCl2 + H2
Formula 1: (n= m/mr)
n = moles, m= mass, mr = molecular mass
Formula 2: (n= v/24)
v = volume
Part 1
What mass of HCl is consumed by the reaction of 3.15 mol of magnesium?
Ratio of
(look at the number in front of each)
2HCl : Mg
2 : 1
(3.15 x 2) : 3.15 moles
6.3 moles : 3.15 moles
So 2HCl has 6. 3 moles
Now use formula 1 (n = m/mr)
Calculate molecular mass of HCl
Check your periodic table
mr of HCl =(1 + 35.5) = 36.5
6.3 = m/36.5
m = 229. 95grams
Part 2
What mass of MgCl2 is produced? Answer in units of g.
Ratio of
2HCl : MgCl2
(1 +35.5) : (24+35.5x2)
36.5: 95
229.95g :?
229.95g : 598.5g
m = 598.5g
Part 3
What mass of H2 is produced? Answer in units of g.
2HCl : H2
36.5 : 2
229.95g :?
229.95g : 12.6g
m = 12.6g
help please.
4. Two unknown elements react to a form a single compound. Element 1 is shiny, malleable, and conductive. Element 2 is a non-conductive gas. When they react, what would you expect to be true about the compound produced? (AKS 2a DOK 3)
a.The compound will probably have properties of both elements like a metalloid.
b.The compound will probably have high boiling points and melting points and will be conductive in solution.
c.The compound will probably have low boiling and melting points and will not be conductive in solution.
d.The compound will probably have high boiling and melting points and will not be
Answer:
this is my old account and these still dont have answers
Explanation:
which part of a star does the star’s energy come from?
Answer:
For most of its active life, a star shines due to thermonuclear fusion of hydrogen into helium in its core, releasing energy that traverses the star's interior and then radiates into outer space. At the end of a star's lifetime, its core becomes a stellar remnant : a white dwarf , a neutron star , or, if it is sufficiently massive, a black hole .
Explanation:
Answer:
its nuclear fusion
Explanation:
Ground water, the largest source of fresh water, is stored in bodies of rock and or sediment
a. porosity
b. sediment
c. particles
d. aquifers
i dont even know what this means
Gas
% of Volume
7.
N
78
Oz
21
Ar
.9
CO2
.04
Ne
1.0018
He
.00052
CHA
.00017
Kr
.00011
H2
.00006
Using the chart above, which gases make up the majority of the Earth's atmosphere?
HELP ASAP
Answer:
this would be the .04 it is very simple
Explanation:
need helped for this
tot Which of the following is not a property of water?
O A. ability to moderate temperatures
O B. ability to adhere to other substances
O c. ability to contract upon freezing
O D. ability to dissolve a wide variety of substances
What is the mass of 5.50 mol of iron
Answer:
306g
Explanation:
[tex]m=5.5*56=308g[/tex]
Answer:
307.45
Explanation:
atomic mass of iron is 55.9 grams
mass = atomic mass × number of moles
= 5.5 × 55.9
= 307.45
HNO3 + KOH → ____ + _____
Answer:
HNO3 + KOH → _KNO3___ + __H2O___
Explanation:
It's balanced
hope it helps