Answer:
I think it's false but not sure
The atoms of platinum and silver are identical. This statement is false.
What is platinum ?Platinum is a chemical element which is represented by the symbol Pt. Its atomic number is 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal.
The elements silver and platinum have the same properties in terms of ductility, malleability, and conductivity of heat and electricity.Platinum is more ductile than gold, silver or copper.
Both metals silver and platinum appear silver. They have gray undertones, unlike white gold which has a warmer, yellow undertone, instead platinum is much brighter and shinier and silver is a duller, gray appearance.
Thus, The atoms of platinum and silver are identical. This statement is false.
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Calculate the molecular mass of the element
They give:H=1,AI=27,S=32,0=16,Cu=64,P=31,Mg=24,N=14,Na=23
Answer:
Cu3 (PO4)2
3×64 + 2×(31+ 4×16)
192 + 2×(31+64)
192 + 2×(95)
192+190
=382g
how many grams and moles of gold are present in 8.09 x 10^28 atoms of gold?
Answer:
Explanation:
how many grams and moles of gold are present in 8.09 x 10^28 atoms of gold?
there are 6.02 x 10^23 molecules or atoms in 1 mole
of a compound or element
8.09 x 10^28 /(6.02 x 10^23) = 1.34 x 10^5 moles of Au
1 mole of gold (see periodic table for #79) 197 g
so 1.34 x 10^5 moles of Au weigh
197 x 1.34 x 10^5 = 2.64 x 10^7 g
your little gold treasure is worth
Gold Price Per Gram $59.87 x 2.64 x 10^7=
$$$$ 1.58 x 10^9
=$ 1,580,000,000
The coefficients in a balanced chemical equation directly represent moles of reacting substances. true or false
The statement "The coefficients in a balanced chemical equation directly represent moles of reacting substances." is true.
What is a balanced equation?A balanced equation is one in which there is an equal number of atoms present on both sides of the reaction. When the atoms of elements in the reaction equal the atoms of elements or compounds in the products. The number of moles is similar before and after the reaction.
The chemical equation is the mathematical representation of any reaction, the number written on the front of the element or compound represents the number of atoms of the element present in the reaction. These numbers are called the coefficient of the chemical equation.
Thus, the statement is true, because the coefficients tell the mole of reacting substance.
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How are polypeptides and proteins similar?
A. They are both made of amino acids.
B. They are both polysaccharides.
O C. They are both nucleic acids.
D. They are both made of carbohydrates.
Answer is A
Answer:
The answer is A.
Explanation:
They are both made of amino acids.
Help with Complex Ions!
Determine the [Ag+] present in solution at equilibrium when the complexing agent ammonia is added to a 0.025 M solution of AgNO3 to result in a [NH3]eq = 0.15 M.
Solubility constant (Ksp) for Ag(NH3)2 2+ is 1.7 * 10^7.
The concentration of [Ag+] present in the solution is 6.53 × 10⁻⁸ M
From the given information, the equation for the reaction between silver ion and ammonia can be represented as:
Ag⁺ + 2NH₃ ↔ [Ag(NH₃)₂]⁺
Given that the solubility constant (Ksp) for the product formed = 1.7 × 10⁷.
The solubility constant for this reaction can be expressed as:
[tex]\mathbf{Ksp = \dfrac{[Ag(NH_3)_2]^+}{[Ag^+][NH_3]^2} }[/tex]
where;
concentration of ammonia = 0.025 Mconcentration of silver nitrate = 0.15 M[tex]\mathbf{1.7 \times 10^7 = \dfrac{0.025}{(x)(0.15)^2}}[/tex]
[tex]\mathbf{1.7 \times 10^7 = \dfrac{1.1111}{x}}[/tex]
[tex]\mathbf{x = 6.54 \times 10^{-8} \ M}[/tex]
Therefore, we can conclude that the concentration of [Ag+] = x = 6.54 × 10⁻⁸ M.
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Correct measurement for solubility
Answer:
g/100g
Explanation:
grams per 100 g of solvent or short term g/100g
Answer:
grams of solute per milliliters of solution
Explanation:
ur welcome
The substances on the left side of a chemical equation are called the:
Select one:
a.
Ingredients
b.
Reactants
c.
Components
What is the oxidation half-reaction for 2Mg + O2 + 2Mgo?
A. O2 + 4e + 202-
B. 202- → 02 + 4e
C. Mg2+ + 2e → Mg
O D. Mg → Mg2+ + 2e
Answer:
OPTION C is correct
When magnesium burns, it combines with oxygen (O2) from the air to form magnesium oxide (MgO) according to the following equation: 2Mg(s) + O2(g) → 2MgO(s) Magnesium oxide is an ionic compound containing Mg2+ and O2− ions whereas Mg(s) and O2(g) are elements with no charges.
14. Write a statement that makes a claim about arrangements of electrons and properties
within a family of elements.
i dont know
Explanation:
What is the relationship between temp./color and magnitude
(STARS)
Answer:
The surface temperature of a star determines the color of light it emits. Blue stars are hotter
hope this helps :)
Does the sound wave above experience a change in pitch or loudness? Why? (PLS HELP 60 ILL PNTS AND ILL GIVE BRAINIEST!!
Answer:
Explanation:
Amplitude, or the size of the wave height, affects the loudness. Larger the amplitude, the louder the volume. Period, or the time it takes for the wave to complete one round, determines the pitch. Shorter period (or higher frequency) means higher pitch.
What is the agent that causes frost wedging?
Answer:
Freeze wedging is caused by the repeated freeze-thaw. Frost wedging occurs as the result of 9% expansion of water when it is converted to ice. Cracks filled with water are forced further apart when it freezes.
Which type of dry-chemical fixed application method introduces a concentration of agent into a closed area
Actuating mechanism is the dry-chemical fixed application method which
introduces a concentration of agent into a closed area.
The actuating mechanism is commonly used in piping systems and
involves the transport of a control member in automatic or remote control
systems.
The closed system makes manual navigation very difficult which is why the
actuating mechanism in automatic systems are usually used to make it less
tedious and accurate.
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Choose the statement that is TRUE. Question 26 options: Outer electrons efficiently shield one another from nuclear charge. All of the answers are true Valence electrons are most difficult of all electrons to remove. Core electrons effectively shield outer electrons from nuclear charge. Core electrons are the easiest of all electrons to remove.
The statement which is true is Core electrons effectively shield outer
electrons from nuclear charge.
Core electrons are those which are in close proximity with the nucleus. The
core electrons repel the outer electrons farther away from the nucleus to
shield it from nuclear charge.
The valence electrons are usually found in the outermost part of the shell
and they are the easiest to remove due to the fact that they have to achieve
a stable octet configuration which makes them easily removed during
chemical reactions.
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Answer: core electrons effectively shield outer electrons from nuclear charge
Explanation:
How many moles of iron are in 50.0g of iron? How many iron atoms are in 59.0g of iron?
Answer:
[tex]50.0 \div 59.0 = 10[/tex]
right
PLEASE HELP
If an atom has a negative charge, it has ___ protons than electrons.
A) More
B) Less
C) The same amount
Answer:
less
Explanation:
An electron has a charge of -1 so if there are more electrons than protons the overall charge of the atom is going to be negative
Find the volume v of the solid obtained by rotating the region bounded by the given curves about the specified line. Y = 8x3, y = 0, x = 1; about x = 2.
The volume v of the solid obtained is 15.08
By using the cylindrical shell method to find the volume v of the solid which can be expressed by the formula;
V = 2πrh drThen, it is paramount to determine the radius and height of the shell.
From the given information;
The cylindrical shell formed by the rotation about the line x = 2Let consider the radius to be 2 - xThe circumference = 2π(2 - x)The height = 8x³Then, the volume v of the solid can be estimated by using the cylindrical shell method as follows;
[tex]\mathbf{V = \int ^1_0 2 \pi (2-x) (8x^3) \ dx}[/tex]
Open brackets;
[tex]\mathbf{V = 2 \pi \int ^1_0 (16x^3 -8x^4) \ dx}[/tex]
Taking the integral form;
[tex]\mathbf{V = 2 \pi \Big [ \dfrac{16x^4}{4}-\dfrac{8x^5}{5} \Big]^1_0}[/tex]
Solving the terms in the bracket
[tex]\mathbf{V = 2 \pi \Big [ \dfrac{16(1)^4}{4}-\dfrac{8(1)^5}{5} -0\Big]}[/tex]
[tex]\mathbf{V = 2 \pi \Big [ 4-\dfrac{8}{5} \Big]}[/tex]
[tex]\mathbf{V = 2 \pi \Big [ \dfrac{20-8}{5} \Big]}[/tex]
[tex]\mathbf{V = 2 \pi \Big [ \dfrac{12}{5} \Big]}[/tex]
[tex]\mathbf{V = \dfrac{24\pi}{5}}[/tex]
[tex]\mathbf{V =15.08}[/tex]
Therefore, we can conclude that the volume v of the solid obtained is 15.08
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does anyone know how to find the electron configuration of an element without using a periodic table?? group and period is already given
What is the unabbreviated electron configuration for Barium?
Answer:
[Xe] 6s2
Explanation:
hope it helps Electron configuration
How do you find the frequency of a recorder?
Answer:
Modern recorders are most commonly pitched at A=440 Hz, but among serious amateurs and professionals, other pitch standards are often found. For the performance of baroque music, A=415 Hz is the de facto standard, while pre-Baroque music is often performed at A=440 Hz or A=466 Hz.
Explanation:
a. What are the half-reactions for the redox reaction CuCl2 + Zn → ZnCl2 + Cu? Label the oxidation
reaction and the reduction reaction. (1 point)
PLS HELP 100 points
The oxidation half equation is Zn ------> Zn^2+ + 2e while the reduction half equation is Cu^2+ + 2e------> Cu.
A redox reaction is a reaction in which there is a loss/gain of electrons. The specie that gives out electrons experiences an increase in oxidation number while the specie that gains the electrons experiences a decrease in oxidation number.
For the reaction; CuCl2 + Zn → ZnCl2 + Cu
The oxidation half equation is;
Zn ------> Zn^2+ + 2e
The reduction half equation is;
Cu^2+ + 2e------> Cu
The chloride ion is excluded because its oxidation number does not change from left to right in the reaction.
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If you have 1 mol xe and 1 mol f₂, how many moles of xef₄ can you create in the following chemical reaction? xe (g) 2 f₂ (g) → xef₄ (g).
The number of moles of XeF4 that can be created would be 0.5 moles.
From the equation of the reactiobn:
Xe (g) 2 F₂ (g) ---> XeF₄ (g)
The mole ratio of Xe to F2 is 1:2. Hence, in the presence of 1 mole Xe and 1 mole F2, F2 would be limiting the reaction.
This means that the amount of F2 would determine the amount of XeF4 that would be produced from the reaction.
The mole ratio of F2 to XeF4 according to the equation is 2:1. This means that for every 1 mole of F2 introduced into the reaction, 0.5 moles of XeF4 will be produced.
In this case, 1 mole of F2 is introduced. Thus, the mole of XeF4 that would be produced would be:
1/2 = 0.5 moles.
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what element is 1s2 2s2 2p3
what happens to the size of the an atom when it becomes an negative ion?
Answer
The negative ion is larger than the original atom.
Explanation:
This means that with fewer electrons but the same number of positive protons, the size of the ionic radius will decrease.
I hope this helped!
What is the molarity of Na+ ions in a 0.02M sodium phosphate solution?
Answer:
.06 M NA+
Explanation:
You go from (.02M Na3PO4 / 1) x (3 mole Na+ / 1 mole Na3PO4) = .06 M Na+
An element Argon has atomic number 18. Deduce the electronic configuration of the elements and suggest the group to which this element belong.
Answer:
8th or 0th group known as Noble gases
asap help for brainlst
List the 7 diatomic elements in the periodic table.
Question 5 options:
All alkaline earth metals- Be, Mg, Ca, Sr, Ba,Ra.
All elements in the periodic table are diatoms.
H2, N2, O2,F2, Cl2, Br2, I2
All group 16 elements-O, S, Se, Te, Po.
Answer:
Group 2A (or IIA) of the periodic table are the alkaline earth metals: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). They are harder and less reactive than the alkali metals of Group 1A. The name comes from the fact that the oxides of these metals produced basic solutions when dissolved in water, and they remained solids at the temperatures available to the ancient alchemists. Like the Group 1A elements, the alkaline earth metals are too reactive to be found in nature in their elemental form.
The alkaline earth metals have two valence electrons in their highest-energy orbitals (ns2). They are smaller than the alkali metals of the same period, and therefore have higher ionization energies. In most cases, the alkaline earth metals are ionized to form a 2+ charge.
The alkaline earth metals have much higher melting points than the alkali metals: beryllium melts at 1287ºC, magnesium at 649ºC, calcium at 839ºC, strontium at 768ºC, barium at 727ºC, and radium at 700ºC. They are harder metals than the Group 1A elements, but are soft and lightweight compared to many of the transition metals.
Salts of the Group 2A metals are less soluble in water than those of Group 1A because of the higher charge densities on the 2+ cations; nevertheless, many Group 2A salts are at least moderately soluble. Some Group 2A salts bond strongly to water molecules, and crystallize as hydrates; among these are Epsom salt, MgSO4·7H2O, and gypsum, CaSO4·2H2O.
Explanation:
Answer:
H2, N2, O2, F2, Cl2, Br2, I2
Explanation:
The 7 diatomic elements in the periodic table are Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine and Iodine.
What is a substrate.
Answer:
A substrate is a molecule acted upon by an enzyme. A substrate is placed into the active site of the enzyme, or the area that permits weak bonds to be formed between the two molecules
Explanation:
Hope it helps:)
Sort the following elements in order from least reactive to most reactive.
A - Sb
B - S
C - F
D - As
Sorting the chemical elements in order from least reactive to most reactive, we have:
1. Fluorine (F).
2. Arsenic (As).
3. Antimony (Sb).
4. Silicon (S).
Given the following chemical elements:
Antimony (Sb).Silicon (S).Fluorine (F).Arsenic (As).Reactivity can be defined as a chemical property which determines how readily a chemical element bonds with other chemical elements, in order to form a new chemical compound.
Generally, the ability of a chemical element to bond with other chemical elements is largely (highly) dependent on the number of valence electrons it has in the outermost shell of its atomic nucleus.
As a general rule, chemical elements that are having fewer number of valence electrons are the most reactive while those having higher valence electrons are least reactive.
Also, chemical reactivity decreases down a group on the periodic table.
Based on the periodic table, the valency for the given chemical elements are:
Antimony (Sb): 5 valence electrons.Silicon (S): 4 valence electrons.Fluorine (F): 7 valence electrons.Arsenic (As): 5 valence electrons.In conclusion, sorting the chemical elements in order from least reactive to most reactive, we have:
1. Fluorine (F).
2. Arsenic (As).
3. Antimony (Sb).
4. Silicon (S).
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I have to answer questions about science
Answer:
What Questions?
Explanation:
What Questions?
Answer:
Explanation:
What is the Questions frist ?