Answer:
Flame test is one of the chemical tests that can be used to identify a metal or metaloid
in an ionic compound.
Explanation:
Flame test is guided by a principle that when an unknown metal is heated, heat of the flame converts the metal ions into atoms which become excited and emit visible light.
To carry out flame test in a laboratory the following instruments are required:
--> a wire loop
--> Bunsen burner
--> the chemical compound under observation
--> protective wears.
The procedure involves the following steps:
--> turn on the Bunsen burner and adjust the barrel of the burner roll the flame is blue.
--> using a clean wire loop deep into a beaker containing hydrochloric acid.
--> to ensure that the loop is clean, it will give the same blue colour of the flame when heated.
--> deep the loop in the acid again and then use it to pick few grains of the metal.
--> place the wire loop in the side of the flame and observe the colour of the flame.
Result of flame tests of some metallic ion will show the following:
--> sodium ion will give yellow colour flame
--> potassium ion will give lilac colour flame
--> calcium ion will give orange-red colour flame
Look at the dots around each symbol and the energy levels from the resources above;
Answer the questions in the text entry option for this assignment.
Copy and paste questions and respond in complete sentences.
Include a space between each question.
Be specific with your responses for each question. Assume your reader has no knowledge of the subject and you are teaching them via your answers.
Please answer the following questions:
Why does Na have only one dot?
Why do none of these diagrams show more than 8 dots?
What relationship do you notice between the dots in these two charts?
The number of dots that hydrogen and helium have in their dot diagram is the same as the number of electrons shown for them on the Periodic Table. Why? (Hint: Octet Rule (Links to an external site.))
Hello! Here's the answer I was able to come up with:
Why does Na have only one dot?
Sodium, or Na, has only one valence electron. (This makes the atom tend to participate in ionic bonding and "give" its single valence electron to an atom like chlorine.)
Why do none of these diagrams show more than 8 dots?
It is physically impossible for an atom to have more than 8 electrons in its valence layer, according to the Octet Rule.
What relationship do you notice between the dots in these two charts?
The dot diagram for each element represents the number of electrons each element will have in its outermost, or valence, shell. (2-8-8)
The number of dots that hydrogen and helium have in their dot diagram is the same as the number of electrons shown for them on the Periodic Table. Why?
An atom can have a maximum of two electrons in its innermost layer. Hydrogen and helium have only one and two electrons, respectively, so they don't have enough electrons to actually have more than one layer. Therefore, their outermost layer is, in fact, their only layer. This is why the number of dots that hydrogen and helium have in their dot diagram is the same as the number of electrons shown for them on the Periodic Table.
Don't copy this word for word! You will most likely be in trouble for plagiarism. Instead, rewrite these ideas in your own words, or paraphrase. Good luck, and I know you can do it! ♥
8. Write the notation of an atom 'X', if the mass number is A and the atomic number is Z.
Answer:
[tex]^A_ZX[/tex] is the notion of an atom 'X', if the mass number is A and the atomic number is Z
Explanation:
The symbol of the element is "X"
The notion comprises of symbol of element "X" in the center.
On the upper left side of the symbol mass number "A" is kept and on the lower left side of the symbol, atomic number "Z" is kept.
Thus, notion will be
[tex]^A_ZX[/tex]
what happens when
limestone is heated
Answer:
When limestone is heated strongly, the calcium carbonate it contains absorbs heat (endothermic ) and decomposes to form calcium oxide. Calcium oxide (also known as quicklime) is a key ingredient in the making of cement and is also used to make certain types of plaster.
Explanation:
Limestone heated
When limestone is heated strongly, the calcium carbonate it contains absorbs heat (endothermic ) and decomposes to form calcium oxide. ... Calcium oxide (also known as quicklime) is a key ingredient in the making of cement and is also used to make certain types of plaster.
Burning Limestone
Burning limestone, which is calcium carbonate, gives you quick lime, calcium oxide. Mixed with water this produces slaked lime, calcium hydroxide. ... This is soft when first mixed, but with time absorbs carbon dioxide from the atmosphere and hardens as it reverts back to calcium limestone.
Limestone exposed to heat and pressure.
Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism. ... Under the conditions of metamorphism, the calcite in the limestone recrystallizes to form a rock that is a mass of interlocking calcite crystals.
Why are metals so strong and hard ?
Answer:
Metals are tough because of an effect called plasticity
Explanation:
if you want to know more go to this site
https://en.wikibooks.org/wiki/A-level_Physics_(Advancing_Physics)/Metals#:~:text=Metals%20are%20tough%20for%20the,This%20effect%20is%20called%20plasticity.
Answer:
The strength of metal depends upon the status of its molecular bonding in the lattice. Stronger the forces stronger will be the metal.
please help! I have an exam tomorrow, How do valence electrons affect how elements behave?
Answer:
Hi, valence electrons are the number of electrons present in the outermost shells of atoms of elements, they affect how sharing or transfer of electrons takes place when the atoms go into any reaction.
they also determine the oxidation state of the atom.
for example, hydrogen has one electron in its outermost shell. therefore in any reactions it tends to loose that electron or gain one more to become stable.
the reason why elements go into reactions is to become stable (to have a complete duplet or octet structure).
As you know, each shells aside from the first has maximum of 8 electrons. so for a element like chlorine which have 7 electrons in the valence shell will gain one electrons in reactions to become stable(have a complete octet structure)
valence electrons also classifies elements( metal or non-metal)
if an element have 1, 2 or 3 valence electron(s), it is likely to be a metal
if an element have 4 or 5, it can be a non-metal or a metalliod (semiconductor)
if an element have 6 or 7, it is likely to be a non-metal
if an element have 8, it is a noble/inert gas
this also explains why noble gases do not react since they already have a duplet structure, they do not need to go into reaction.
good lucks on your exams.
Answer:
The number of electrons in an atom's outermost valence shell governs its chemical properties. ... This tendency is called the octet rule, because the atoms have eight valence electrons. METALS. The most reactive metallic elements are metals from Group 1 (e.g., Na or K ) or Group 2 (e.g., Mg or Ca )
hope this helps.
what do we call the lines around the nucleus of an atom?
Explanation:
As you know, electrons are always moving. They spin very quickly around the nucleus of an atom. As the electrons zip around, they can move in any direction, as long as they stay in their shell. Any direction you can imagine — upwards, downwards, or sidewards — electrons can do it. Electrons are constantly spinning in those atomic shells and those shells, or orbitals, are specific distances from the nucleus. If you are an electron in the first shell, you are always closer to the nucleus than the electrons in the second shell.
Answer:
Electrons
Explanation:
Electrons orbit around the nucleus.
Is Octisalate (C15H22O33) ionic or covalent?
Name the following compounds:
Answer:
why
Explanation:
why don't we need to answer, did you already found the answers
Is this answer right ?
Answer:
YESExplanation:
Explanation
#KEEPSTUDYINGYes because it released the most amount of heat overall!!! well done xx
Consider the reaction H2(g) + I2(g) Double headed arrow. HI(g) with an equilibrium constant of 46.3 and a reaction quotient of 525. Which direction will the system shift to?
Answer:
The reaction shifts to the left.
Explanation:
Equilibrium constant (K) = 46.3
Reaction Quotient (Q) = 525
The relationship between Q and K with their implications are given as;
K = Q (No net reaction)
K > Q (Reaction shifts to the right)
K < Q (Reaction shifts to the left)
Since in this question, Q (525) > K (46.3)
The reaction shifts to the left.
An ionic compound that conducts electricity is called an ______
Answer:
Electrolyte
hope it helps and your day will be full of happiness
Consider a buffer solution that is 0.50 M in NH3 and 0.20 M in NH4Cl. For ammonia, pKb=4.75. Calculate the pH of 1.0 L of the solution upon addition of 30.0 mL of 1.0 M HCl to the original buffer solution.
Express your answer to two decimal places.
***will mark Brainliest for right answer ***
The pH of the solution is 9.56.
Given:
Mol of NH₃ = 0.50
Mol of [tex]NH_4^+[/tex] = 0.20 to start (NH₄Cl dissolves completely)
Molarity = 1.0 M
30.0 mL of 1.0 M HCl is 0.0300 mol of HCl.
This will react with the NH₃ to produced 0.030 mol of [tex]NH_4^+[/tex] .
Henderson-Hasselbach equation:This equation is used to calculate pH. It is an approximate equation that shows the relationship between the pH or pOH of a solution and the pKa or pKb and the ratio of the concentrations of the dissociated chemical species
pH = pKa + log(base/acid)
pKa = 14 - pKb
pKa= 14 - 4.75
pKa= 9.25
pH = 9.25 + log(0.47/0.23)
pH = 9.56
Thus, the pH of the solution is 9.56.
Find more information about pH here:
brainly.com/question/22390063
How does the rate law show how concentration changes affect the rate of
reaction?
A. The rate is expressed as the sum of the concentrations of
reactants raised to some power.
B. The rate is expressed as the difference between the
concentrations of reactants.
C. The rate is expressed in terms of concentrations of the reactants
raised to some power.
D. The rate is expressed as a ratio of the concentrations of reactants
raised to some power.
SUBMIT
Answer: C
Explanation: I just did it
The rate law show how concentration changes affect the rate of
reaction. The correct statement is "The rate is expressed in terms of concentrations of the reactants raised to some power".
So, the correct option is C.
What is the rate law?The rate law is a mathematical expression which give relation between rate of reaction to the concentration of reactant.
Let suppose the reaction, A + B → C
Rate law is written as, rate = [A]n[B]m
Where, n and m is order of reaction which determine by experimental.
To learn more about rate law here.
https://brainly.com/question/4222261
#SPJ2
can someone answer the 4 questions? (4 is optional) it would really help me out thanks
Answer:
1)Energy converter is the transformation of one form of energy into another form .It is more specifically that the term energy conversions refers to the process through which energy is changed into forms that are useful to humans .For 100 of years humans have used an array of devices and systems for this purpose.
2) The three energy converters that you or your family use regularly are
Electric Iron Electric BulbElectric generator3)The three kinds of power plants that produce electricity in Ontario are
Nuclear Power PlantsHydroelectric Power PlantsGeothermal Power Plants4)A power plant is an industrial facility that generates electricity from primary energy most of the power plants use one more generators that convert mechanical energy into electrical energy in order to supply power to the electrical grid for society's electrical needs.
may be this was ur answer for ur question u wanted
20. How many atoms of Lithium (Li) are in the REACTANTS side of the
equation?
Answer:
2 atoms
Explanation:
The reactants side is the left side of the arrow. Li represents lithium and there is a 2 next do it which indicates that there are 2 lithium particles or atoms
Convert 0.0000000166 mm to scientific notation?
Answer:
0.0000000166 mm = 16.6×10^-9 mm
This will be the scientific notation.
chemical equation Water decomposes into hydrogen and oxygen.
Water is a chemical compound also known as H2O and is composed of two hydrogen atoms (H) and one oxygen atom (O).
2 H2O → 2 H2 + O.
Sorting and separating are ways to classify matter using _______ properties. Your answer
I need help on this :/
Answer:
Physical
Explanation:
Hope this helps :)
15. What is the molar mass of H2CO3?
(atomic mass: C = 12.01, H = 1.01, 0 = 15.99)
Answer:
62.00
Explanation:
H2 means that there are two moles of hydrogen so multiply the atomic mass by two (1.01 × 2 = 2.02)
C only has one mole sp leave 12.01 alone
And multiply oxygen by 3 because there are three moles of oxygen (15.99 × 3 = 47.97)
Add them all together!
2.02 + 12.01 + 47.97 = 62.00 for molar mass
Who is responsible for the impacts of overfishing?
Answer:
Japan, China, the U.S., Indonesia, Chinese Taipei and South Korea have been named by Pew Charitable Trusts on a “shame list” of countries responsible for overfishing tuna in the Pacific. According to Pew, the “Pacific 6” are responsible for 80 percent — 111,482 metric tons in 2011 — of the annual catch of bigeye tuna.
Hope it will help you
Give me lil reasoning so I know your not lying for points
:(
(I’ll mark you as brainlister )
A STACK OF BOOKS WEIGHED 5 KILOGRAMS. ONE BOOK, WHICH WEIGHED 1,000 GRAMS, WAS
REMOVED FROM THE STACK HOW MUCH DID THE REMAINING BOOKS WEIGH?
Answer:
the remaining books weigh 4 kilograms or 4000 grams
2A → B + C The above reaction is run and it is found that a plot of the natural log of the concentration versus time is linear. This indicates that the reaction is ...
Answer:
zero order reaction
Explanation:
The seem to be a reaction is zero order as the data only fits to zero order integrated rate law.
Integrated rate law:
[A] = [A]_0 – kt
Here y = [ A] and slope is -k , so when we plot concentration of A with respect to t then we get the equation in the form of line
y = mx + c
So the answer Zero order in [A]
Which molecule will undergo only London dispersion forces when interacting with other molecules of the same kind? a.HCl b.C2H5OH c.NH3 d.CH4
Answer:
CH4
Explanation:
London dispersion forces are a type of force acting between atoms and molecules that are normally electrically symmetric; that is, the electrons are symmetrically distributed with respect to the nucleus. They are part of the van der Waals forces(Wikipedia). It is a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles. This force is sometimes called an induced dipole-induced dipole attraction(Chem Purdue).
If we consider HCl, C2H5OH and NH3, we will discover that they all have polar bonds. Consequently, dipole - dipole interaction as well as hydrogen bonds exist between their molecules.
CH4 is nonpolar. Being a nonpolar molecule, the only possible intermolecular interaction forces between its molecules is the London dispersion forces.
which horizon has the least weathered rocks? How do you know?
Answer:
C: The C horizon is a subsurface horizon. It is the least weathered horizon. Also known as the saprolite, it is unconsolidated, loose parent material. The master horizons may be followed by a subscript to make further distinctions between differences within one master horizon.
Explanation:
PLEASE HELP I WILL MARK YOU BRAINLIEST How many moles of FeCl2 do you need to react 5 moles of Cl2?
Answer:
1. Ok, so you have a 1:1 ratio of FeCl2 to FeCl3, which is shown by the fact that if you react 2 moles of FeCl2 you get 2 moles of FeCl3. So therefore, if you react 4 moles of FeCl2, you'd form 4 moles of FeCl3.
2. You have a 1:2 ratio of Cl2 to FeCl2, for every 1 mole of Cl2, you need 2 moles of FeCl2, so therefore, for 7 moles of Cl2, you need 2x7moles = 14 moles
3. 1:1 ratio. So you start with 2.28moles.
4. 1:2 ratio of Cl2 to FeCl2, so therefore to get from FeCl2 to Cl2 you need to divide by 2. Therefore, you need 3.25moles / 2 = 1.625 moles
Explanation:
pls mark branliest
A 1.0L buffer solution contains 0.100 molHC2H3O2 and 0.100 molNaC2H3O2. The value of Ka for HC2H3O2 is 1.8×10−5. Calculate the pH of the solution upon the addition of 10.0 mL of 1.00 MHCl to the original buffer.
Express the your answer to two decimal places.
***will mark Brainliest for right answer ***
Create a timeline to show how atomic structure was developed over the centuries?
Answer A`bousi
Explanation:
How can sand be classified as individual evidence?
Answer:
Individual Characteristics are properties of physical evidence that can be attributed to a common source with a high degree of certainty. Examples of individual evidence include anything that contains nuclear DNA, toolmarks, and fingerprints.
Explanation:
According to the diagram below, which of the following factors keeps Earth in motion around the sun?
Planet
Gravity
Inertia
Sun
Actual
orbit
Answer:
gravity
Explanation: