Answer:
Ball with thingies around it
Identify the group of elements with the same outermost energy level
a)H, He
b)N, P, As, Bi
c)Rb, Sr, Y, Zr
d)B, Si, As, Te, At
Answer:
A
Explanation:
b) N, P, As, Bi
Elements in the same group all have the same number of valence electrons and therefore similar chemical properties. Valence electrons help in predicting chemical reactions.So all the atoms of a given element have the same energy levels because they have the same numbers of electrons and protons.N, P, As, Bi for this group of elements, all these elements belongs to same group i.e. group 15. Group 15 has total 5 valence electrons.Electronic configuration = ns²np³All these elements will have same outermost energy level.Learn more:
brainly.com/question/371590
Which pair of elements has the most similar properties?
A) N and P
B) K and He
C) I and CA
D) Li and B
Answer:
So, the elements with similar properties to sodium (Na) are all of those elements in the same Group.
Explanation:
The ones "most" similar would be the ones closest in mass as well. Those would be Lithium (Li) and Potassium (K).
Answer:A) N and P
Explanation:
N and P, because they are in the same group on the periodic table. This is because they both have 3 valence electrons, and properties of elements are dependent partly on the number of valence electrons they have.
A sample of silver has a mass of 21 grams
and a volume of 2 cm3. What is the density
of silver?
Answer:
[tex]density \: of \: the \: silver = \frac{mass}{volume} = \frac{21}{2} \\ = 10.5 \: gram {(cm)}^{ - 3} [/tex]
10.5 gram(cm)^-3 is the right answer.Explanation:
recall that density is equal to mass/volume :21÷2= 10.5g/cm3
What is the main function of the muscular system is to allow the of the body
Answer:
The muscular system is composed of specialized cells called muscle fibers. Their predominant function is contractibility. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement. Nearly all movement in the body is the result of muscle contraction.
[tex]\huge\star{\underline{\mathtt{\red{A}\pink{N}\green{S}\blue{W}\purple{E}\orange{R}}}}\star[/tex]
The muscular system is composed of specialized cells called muscle fibers.
Their predominant function is contractibility. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement.
Nearly all movement in the body is the result of muscle contraction.
NEED HELP WIT 6th grade science homework PLZ HELP
Answer:
the answer is it results in a change of temperature in both objects
why did modern's say atoms are divisible
!!PLEASE HELP!! Will give brainliest and like and rate 5 stars!! please help me i don't know how to do this. Please balance the equation and say what type of reaction it is (synthesis, decomposition, single replacement, double replacement, or combustion).
Answer:
The equation is already balanced. It is a double replacement.
Explanation:
The equation is balanced since there are the same amounts of each element on both sides. A double replacement is when AB + CD = AD + CB. In this case, Ag (A) reacts with CL(D) and Na (C) reacts with NO3 (B).
What is the atomic mass of aluminium?
The temperature of a substance is a measure of the
1.
average kinetic energy of its particles
2.
average potential energy of its particles
3.
ionization energy of its particles
4.
activation energy of its particles
Answer:
1. average kinetic energy of its particles
Explanation:
The temperature of a substance is a measure of the average kinetic energy of its particles.
The average kinetic energy of the particles of a substance is directly proportional to its temperature. This is one of the premise of the kinetic theory of gases.
When thermal energy is supplied to a substance, the molecules gains kinetic energy. As the kinetic energy increases so also the temperature of the substance. So, we see that kinetic energy and temperature are connected through the thermal energy acquired by the substance.what gas is formed when zinc reacts with dilute hydrochloric acid
Answer:
Hope it helps.
Explanation:
When zinc reacts with hydrochloric acid it produces zinc chloride and hydrogen gas.
CH4 + 202 → CO2 + 2H2O
How many grams of O2 needed to react with 2 moles of CH4?
100 g O₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
BracketsParenthesisExponentsMultiplicationDivisionAdditionSubtractionLeft to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[RxN - Balanced] CH₄ + 2O₂ → CO₂ + 2H₂O
[Given] 2 mol CH₄
[Solve] x g O₂
Step 2: Identify Conversions
[RxN] 1 mol CH₄ → 2 mol O₂
[PT] Molar Mass of O - 16.00 g/mol
Molar Mass of O₂ - 2(16.00) = 32.00 g/mol
Step 3: Stoichiometry
Set up conversion: [tex]\displaystyle 2 \ mol \ CH_4(\frac{2 \ mol \ O_2}{1 \ mol \ CH_4})(\frac{32.00 \ g \ O_2}{1 \ mol \ O_2})[/tex]Multiply/Divide: [tex]\displaystyle 128 \ g \ O_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 1 sig fig.
128 g O₂ ≈ 100 g O₂
Mass of O₂= 128 g
Further explanationGiven
Reaction
CH₄ + 20₂ → CO₂ + 2H₂O
2 moles of CH₄
Required
Mass of O₂
Solution
In a chemical equation, the reaction coefficient shows the mole ratio of the compounds involved in the reaction, reactants or products
From the equation, mol ratio of CH₄ : O₂ = 1 : 2, so moles O₂ :
= 2/1 x moles CH₄
= 2/1 x 2
= 4 moles
Mass of O₂ :
= mol x MW
= 4 x 32 g/mol
= 128 g
How many moles of Al2O3 are formed from the reaction of 6.38 mol O2 and 9.15 mol Al?
Answer:
The number of moles of Al2O3 formed is about 4.25 moles
Explanation:
this is simple, I just want to check my answer for this
What is the correct FORMULA for Aluminum borate?
Answer:
I think it's K2Al2B2O7
Aluminum Borate or Aluminum Boron Oxide is AlBO₃
on reaction:
BO₃⁻³ + Al⁺³ ==> AlBO₃
wood is A)element B)compound C)mixture
How many grams is 5.4x10 to the 23 molecules of al2o3?
Answer:
91.49 grams
Explanation:
No of molecules = no of moles × Avogadro's number
No of moles = No of molecules / Avogadro's number
Number of moles = 5.4×10^23/6.02×10^23
Number of moles = 0.897 moles of Al2O3
Number of moles = mass in gram / molar mass
Mass in gram = number of moles× molar mass
Mass in gram = 0.897× 102
91.49 grams
What might happen if the strong force didn’t exist
Answer:
d
Explanation:
Write down a question about yeast fermentation that can be answered through scientific investigation.
Explanation:
Alcoholic fermentation converts one mole of glucose into two moles of ethanol and two moles of carbon dioxide, producing two moles of ATP in the process. The overall chemical formula for alcoholic fermentation is: C6H12O6 → 2 C2H5OH + 2CO
Answer:
1. If you leave yeast fermentation out for 3 days what happens?
2. If you put yeast fermentation out in the sun will it still work?
Explanation:
These can be answered through scientific investigation.
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help meeeeeeee??????????
Answer:
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Explanation:
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Please actually try when you answer. If you don't know the answer, don't answer and say that, I don't give a flip if you don't know the answer. How does a cell at the end of the first phase of the cell cycle differ from a cell at the end of the second phase?
Answer:
See the answer below
Explanation:
Knowing that the cell cycle has two phases
the first phase which is the interphase; andthe second phase, the m phaseA cell at the end of interphase would have grown in volume and have a doubled amount of DNA compared to the same cell at the end of m phase. Such a cell would also have more biochemical contents than its counterpart at the end of m phase.
The interphase is divided into;
G1 phase,S phase; andG2 phaseA cell at the end of m phase undergoes massive growth and development at the G1 phase, doubles its DNA at the S phase through replication, and synthesizes proteins at the G2 phase before hopping into the m phase again.
Although no blueprints of the pyramids have been found, what evidence suggests humans, not aliens, built the pyramids?
What happens to the P on ATP when it leaves the ATP molecule?
Answer: ATP is the energy currency molecule which is required for cellular processes.
Explanation:
When the cell require metabolic energy to perform a particular a task. From the ATP or adenosine triphosphate molecule one of three phosphate molecule gets displaced and liberates the resulting molecule becomes adenosine diphosphate or ADP. The phosphate molecule is used by the cell to perform different cellular and metabolic functions as a source of metabolic energy. The phosphate is released by the hydrolysis of the phosphoanhydride bond with the other phosphate group.
What is the Chemical Formula and Net Ionic Equations for all three solutions.
Answer:
See answer below
Explanation:
As you are asking for chemical formula and ionic equation, then, I will assume that after the station #3 below, are the solutions you are requiring.
You are also not specifing if you want for example, result of solution 1 + solution 3. If you need that, please post that on another question.
Now for the chemical formula, you need to identify the elements in all 3 solutions, and also the type of compound.
1. Solution 2 Potassium Iodide:
In this case we have Potassium on one side, and Iodine on the other side, the symbol for those are K and l. As Potassium have the +1 oxidation state, cause is the only one that it can have, when it's next to an halide like chlorine or bromine, it will form a binary salt. The halides, usually work with the lowest oxydation state. In the case of Iodide it will be -1, so, the formula will be:
KI
And the net ionic equation will be the chemical equation that shows how the charges and atoms are balanced. In this case it would be:
K⁺ + I⁻ ------> KI
2. Solution 1 and 3, Lead (II) nitrate and Sodium carbonate:
In this case I will work with both, because both of the solution are tertiary compounds. In this cases, we have two tertiary salt, The Sodium symbol is Na, and is working with it oxydation state +1. Carbonate is an anion and have the formula CO₃ working with the oxydation state -2. Lead can work with oxidation state +2 and +4. It's symbol is Pb. Nitrate is NO₃ and works with oxydation state -1 instead.
The chemical formula and ionic equation for both will be:
Lead(II) nitrate: Pb(NO₃)₂
Sodium Carbonate: Na₂CO₃
And the net equations:
Lead nitrate: Pb²⁺ + 2NO₃⁻ ------> Pb(NO₃)₂
Copper sulfate: 2Na⁺ + CO₃²⁻ -------> Na₂CO₃
Hope this helps
What amount of ice must be added to 250 g of water at 15°c to cool the water to 0°c and have no ice left
Answer:
[tex]\mathbf{m= 47 \ g}[/tex]
Explanation:
The heat needed to melt ice [tex](q_1)[/tex] + heat needed to cool water [tex](q_2)[/tex] = 0
[tex]m\Delta H_{fusion} + mc \Delta T = 0[/tex]
[tex]m \times 333.55 J g^{-1} + 250 \ g \times 4.184 \ Jg^{-1 \ 0 } \times (-15.0 \ ^0 C) = 0[/tex]
[tex]m \times 333.55 J g^{-1} =15690[/tex]
[tex]m=\dfrac{15690 \ J }{333.55 J g^{-1} }[/tex]
[tex]\mathbf{m= 47 \ g}[/tex]
1. 32.5grams of NaOH (sodium hydroxide) reacts an excess of CO2 (carbon dioxide).
2NaOH(s) + CO2(g) → Na2CO3(s) + H2O(1)
a.
What is the theoretical yield of Na2CO3 in grams? Answer: 43.1g Na2CO3
b.
If 16.45 g of Na2CO3 is formed, what is the percent yield? Answer: 38.2%
a. 43.1 g
b. 38.2%
Further explanationGiven
32.5 grams of NaOH
Required
The theoretical yield of Na₂CO₃
The percent yield
Solution
Reaction
2NaOH(s) + CO₂(g) → Na₂CO₃(s) + H₂O(l)
mol NaOH :
= mass : MW
= 32.5 : 40 g/mol
= 0.8125
mol Na₂CO₃ from the equation :
= 1/2 x mol NaOH
= 1/2 x 0.8125
= 0.40625
a.
Mass Na₂CO₃ :
= mol x MW Na₂CO₃
= 0.40625 x 106 g/mol
= 43.0625≈43.1 g
b. % yield = (actual/theoretical) x 100%
%yield = 16.45/43.1 x 1005
%yield = 38.17%≈38.2%
What is the weight of the water that is displaced by a floating object compared to the weight of the object?
Answer:
The amount of fluid displaced is directly related (via Archimedes' principle) to its volume. In the case of an object that sinks (is totally submerged), the volume of the object is displaced. In the case of an object that floats, the amount of fluid displaced will be equal in weight to the displacing object.
Explanation:
wikipedia
15. On some occassions, more than half of the moon is dark.
O
a. True
O b. False
what is a brine solution ?
Answer:
the aqueous solution of Naclis known as brine
EASY POINTS GIVEN! WILL MARK BRAINLIEST:)
Answer:
faxs
Explanation:
Answer:
the first oneeeeeeeee
Calculate the mass of 3 moles of CCI4
Answer:
So one mole of ccl4 contains 152 grams. it implies that 3 moles of ccl4 contains 152 * 3 grams. it is equal to 456. grams.
Explanation:
Hope this helps
4.Identify each substance in the following word equation as a reactant or a product
limestone heat lime + carbon dioxide
5.What is the difference between an exothermic and endothermic reaction?
Explanation:
4. limestone heat lime + carbon dioxide
The reactants in this expression above is limestone
The products of the reaction is carbon dioxide and lime
Reactant is the species that gives the product and it is usually found on the left hand side of the expression.
The product is the substance on the right hand side of the expression that forms through the experiment.
Heat is used to facilitate the reaction.
5. An exothermic reaction is a reaction in which heat is given off.
An endothermic reaction is a reaction in which heat is absorbed in the process.
An exothermic reaction is always warmer after the reaction whereas an endothermic reaction is colder at the end of the reaction.
