Number of neutrons=41, and it is metalloid
Further explanationGroup 14⇒valence electron = 4(ns²np²)
Period 4⇒n=4
So electron configuration of the element :
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p² = 32 electron=atomic number
The element with atomic number 32, which is in period 4 and group 14 is Ge-Germanium
There are seven elements that can be classified as metalloids, namely boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), and polonium (Po).
While the mass number: 73
So the number of neutrons = mass number-atomic number
[tex]\tt 73-32=41[/tex]
if you are given one element name and % by mass, how do you find the other element in the compound? give example plz
The percentage of elements in the compound is determined from the number of elements in the compound
Further explanationProust states the Comparative Law that compounds are formed from elements with the same Mass Comparison so that compounds have a fixed composition of elements
[tex]\tt \%A~in~A_xB_y=\dfrac{x\times Ar~A}{MW~A_xB_y}\times 100\%[/tex]
[tex]\tt \%B~in~A_xB_y=\dfrac{y\times Ar~B}{MW~A_xB_y}\times 100\%[/tex]
Example
% Lithium (Li) in Li₂CO₃(lithium carbonate)
Ar of Li = 6.941 g/mol
MW of Li₂CO₃ = 73.891 g/mol
[tex]\tt \%Li=\dfrac{2.Ar~Li}{MW~Li_2CO_3}\times 100\%\\\\\%Li=\dfrac{2\times 6.941}{73.891}\times 100\%=18.79\%[/tex]
Si un elemento químico tiene un numero atomico z=12, y es un atomo neutro (igual cantidad de electrones y protones), ¿Cual es la configuracion electronica esperada?
Answer:
1s² 2s² 2p⁶ 3s²
Explanation:
La configuración electrónica muestra la secuencia de llenado de electrones en los orbitales de los subniveles guiada por algunos principios.
El número máximo de electrones en los orbitales de los subniveles es dos para el subnivel s (un orbital); seis para el subnivel p (tres orbitales); diez para el subnivel d (cinco orbitales) y catorce para el subnivel f (siete orbitales). Esto indica que el número máximo de electrones en un orbital es dos.
Se sabe que un elemento químico que tiene un número atómico Z = 12 y es un átomo neutro es Magnesio (Mg). Sin embargo, dado que tiene el mismo número de protones y electrones; La configuración electrónica esperada se puede escribir como:
1s² 2s² 2p⁶ 3s²
When metal atoms bond with nonmetal atoms, what will the non metal atoms do?
Answer:
Ionic bonding involves the transfer of electrons from a metal atom to a non-metal atom until the outer shells of their resultant atoms are similar to that of a noble gas. The metals lose electrons and form cations while the non-metals accept the electrons and form anions.
When a chemical bond forms between metal and nonmetal atoms, the nonmetal atom accepts electrons from the metal atom to reach a stable state.
A bond that forms between metal and nonmetal atoms is called an ionic bond. In ionic bonding, the metal atom, the cation, donates electrons to the nonmetal atom, the anion.
Thus, both electron donor and acceptor are able to reach an octet state through donation/acceptance of electrons and an ionic bond is formed as a result.
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How would the strength of an electromagnet change if a copper core was
used to replace its iron core?
O A. It would decrease.
B. It would stay the same.
C. It would increase.
D. It would vary unpredictably.
SUBMIT
Answer:
C
Explanation:
Answer: decrease I believe
Explanation:
Just because if you replaced copper with iron it gets stronger
A person is pushing a box across a table. The measured forces on the box are 10N, 14N, -7N, -10N.
Which force is represented by -7N?
force of friction
normal force
force of gravity
push force
Answer:
a
Explanation:
The force acting downwards or opposite to normal force which reduces the movement is indicated with a negative sign. Hence, the force of -7N is frictional force.
What is force?Force is an external agent acts on a body to change it from the state of rest or motion. There are various forces such as frictional force, magnetic force, gravitational force etc.
Frictional force is the resistive force which make the object resistive in motion. Thus it is indicated with a negative sign. Gravitational force is the force by which an object attracts other objects into its centre of mass.
Hence, gravitational force also making the body resistive to motion. Here, -10 N is the gravitational force acting on the box and it experience a force of -7N which also resists its force in the opposite direction of the normal force.
Hence, -7N is the force of friction acting on the body.
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Describe the evidence of changes in organisms in the Cambrian Era that are reflected in the fossil record.
Answer:
Morphology and phylogenetics revealed by fossils. Perhaps the strongest evidence to support the Cambrian evolutionary explosion of animal forms is the first clear appearance, in the Early Cambrian, of skeletal fossils representing members of many marine bilaterian animal phyla
Explanation:
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Which of the following is important to gbellringer #13. Which of the following is important to generating heat?
A. Friction
B. Chemical reactions
C. Sunlight
D. All of the above
Answer:
D.) All of the above
Explanation:
Every answer is possible of creating heat.
* Good luck
What is the purpose of coating a plastic record with metal before electroplating is done?
Answer:
i hope it helps
Explanation:
The purpose of preparing the surface before beginning to plate another metal onto it is to ensure that it is clean and free of contaminants, which may interfere with the bonding. Contamination often prevents deposition and lack of adhesion. Normally this is done in three steps: cleaning, treatment and rinsing. Cleaning usually consists of using certain solvents such as alkaline cleaners, water, or acid cleaners in order to remove layers of oil on the surface. Treatment includes surface modification which is the hardening of the parts and applying metal layers. Rinsing leads to the final product and is the final touch to electroplating. Two certain methods of preparing the surface are physical cleaning and chemical cleaning. Chemical cleaning consists of using solvents that are either surface-active chemicals or chemicals which react with the metal/surface. In physical cleaning there is mechanical energy being applied in order to remove contaminants. Physical cleaning includes brush abrasion and ultrasonic agitation.
This is Bohr's Model of:
A. Oxygen
B. Magnesium
C. Sulfur
Answer:
I think it's C
Explanation:
What happens at the cathode
Answer:
At the cathode in an electrolytic cell, ions in the surrounding solution are reduced into atoms, which precipitate or plate out on to the solid cathode. The anode is where oxidation takes place, and the cathode is where reduction takes place. The anode is defined as the electrode where oxidation occurs. The cathode is the electrode where reduction takes place. ... At the cathode, the metal ion in the solution will accept one or more electrons from the cathode, and the ion's oxidation state will reduce to 0. This forms a solid metal that deposits on the cathode.
What is a molecular formula
True or False-- Siblings (brothers and sisters) may or may not have the same combination of traits.
Answer:
True
Explanation:
Hope it helped. :)
Answer:
definitely true
Explanation:
everyone is different
SOMEONE HELP ME PLEASEEEE!!!
What is the outermost layer of the Earth called?
Answer:
the outermost layer called Crust
An object with a mass of 3.2kg has a force of 16.3 newtons to the right and 6.7 newtons to the left applied to it. What is the resulting acceleration of the object?
Answer:
3m/s²
Explanation:
Given parameters:
Mass of object = 3.2kg
Force to the right = 16.3N
Force to the left = 6.7N
Unknown:
Acceleration of the object = ?
Solution:
To solve this problem, we use newtons second law of motion;
Net force = mass x acceleration
Net force on object = Force to the right - Force to the left
Net force = 16.3N - 6.7N = 9.6N
So;
9.6 = 3.2 x a
a = [tex]\frac{9.6}{3.2}[/tex] = 3m/s²
can you solve this 2+__=9 (constants) and __+__9 (variables)
Answer:
2+7=9(constant)
6.5+2.5=9(variable)
The equilibrium constant Kc for the reaction below is 0.00584 at a certain temperature. Br2(g) ⇌ 2Br(g) If the initial concentrations are [Br2] = 0.0345 M and [Br] = 0.0416 M, calculate the concentrations of these species at equilibrium.
Answer:
Explanation:
Given that:
The chemical equation for the reaction is:
Br2(g) ⇌ 2Br(g)
Initially 0.0345M 0.0416M
[tex]Q_C = \dfrac{[Br]^2}{[Br_2]} = \dfrac{(0.0416)^2}{(0.0345)}= 0.05016[/tex]
[tex]Q_C =0.05016 >>> K_c(0.00584)[/tex]
Thus, the given reaction will proceed in the backward direction
The I.C.E table is as follows:
Br2(g) ⇌ 2Br(g)
I 0.0345 0.0416
C +x -2x
E (0.0345+x) (0.0416 -2x)
[tex]K_c = \dfrac{[Br]^2}{[Br_2]} = \dfrac{(0.0416-2x)^2}{(0.0345+x)} = 0.00584[/tex]
= 0.00173056 - 0.0832x - 0.0832x + 4x² = 0.00584 (0.0345 +x)
= 0.00173056 - 0.166x + 4x² = 2.0148× 10⁻⁴ + 0.00584x
= 0.00173056 - 2.0148× 10⁻⁴ - 0.166x - 0.00584x + 4x²
= 0.00152908 - 0.17184x + 4x²
Solving by using Quadratic formula
x = 0.03038 or 0.0126
For x = 0.03038
At equilibrium
[Br₂] = (0.0345 + 0.03038) = 0.06488 M
[Br] = (0.0416 -2(0.03038)) = - 0.01916 M
Since we have a negative value for [Br], we discard the value for x
For x = 0.0126
At equilibrium
[Br₂] = (0.0345 + 0.0126) = 0.0471 M
[Br] = (0.0416 -2(0.0126)) = 0.0164 M
The half-life of cobalt-60 is 5.26 years. If a sample originally contained 220 grams of this isotope, how many grams would be left after 10.52 years?
Answer:
Question Answer
The half-life of cobalt-60 is 5.26 years. How many half-lives have passed in 10.52 years? 2
12.5% of a radioactive sample are left. How many half-lives have passed? 3
After 3 half-lives, how much of a 400 gram sample of radioactive uranium remains? 50g
Explanation:
Oil of vitriol is a substance that humankind has known of for
thousands of years! Today the substance is known by it's
scientific name sulfuric acid and has the molecular formula
H2SO4.
What is the molar mass of H2SO4?
g/mol
Answer: 98.08 g/mol
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What is an atom? In your own words
What is at the center of an atom?
An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across
The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged)
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Angela is a serious basketball player, but lately she has been struggling. First, her legs started getting tired halfway through practice. Next, her bones started aching. This week, she feels like she can’t even take a full breath.
Angela goes to see Dr. Chao. “I feel like my whole body is falling apart. How can there be so many different things going wrong with me at the same time?” Angela asks. Dr. Chao does a physical exam and asks Angela to take a few deep breaths. “Actually,” the doctor responds, “there’s only one small thing wrong with your lungs. Fortunately, there is a medicine that will improve all your symptoms right away.”
How can a problem in Angela’s lungs cause problems all over her body?
Answer:
Because the entire body functions off of the air given to the body through the lungs.
How to test for ionic and covalent substances
Answer:
An easy way of determining the type of bond within a molecule is to look for the type of compound involved.
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To take a weighted average of all the naturally occurring isotopes of an element in order to arrive at an average
atomic mass, you would
o multiply the mass of each isotope by the decimal fraction representing its abundance naturally, then add all these products
together.
O use the isotope with the largest mass.
O use the isotope with the most average mass.
o add all the masses of all of the isotopes, then divide by the number of isotopes.
Answer:
o multiply the mass of each isotope by the decimal fraction representing its abundance naturally, then add all these products together.
Explanation:
To find the average atomic mass of an atom, take the weighted average of all naturally occurring isotopes of an element and sum them together.
The average atomic mass is determined from the geonormal abundances of the isotopes.Average mass of all isotopes = summation of all the mass of isotopes of the element x abundance of the isotope.
The abundance of the isotope is usually taken as a decimal fraction.
What is iron's atomic mass? (round to tenths )
HELP!
Suppose 4.0 grams of H2 were used? How many grams of water would be produced?
Answer:
36g
Explanation:
Given parameters:
Mass of H₂ = 4g
Unknown:
Mass of water produced = ?
Solution:
The reactants in this experiment are hydrogen and oxygen gas. The product formed will be water, H₂O.
Now write the reaction equation first;
2H₂ + O₂ → 2H₂O
Find the number of moles of Hydrogen gas;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of H₂ = 2(1) = 2g/mol
Number of moles = [tex]\frac{4}{2}[/tex] = 2moles
From the balanced reaction equation;
2 moles of H₂ will produce 2 moles of H₂O
So, mass of H₂O produced;
Mass of H₂O = number of moles x molar mass
Molar mass of H₂O = 2(1) + 16 = 18g/mol
Mass of H₂O = 2 x 18 = 36g
We can see from the calculations that the use of 4g of hydrogen produces 36 g of water.
We know that water is produced from the equation;
2H2(g) + O2(g) ----> 2H2O(g)
Number of moles of hydrogen = 4 g/2 g/mol = 2 moles of hydrogen
From the reaction equation, we can see that 2 moles of hydrogen yields 2 moles of water.
Hence, If we use 4g of hydrogen, we end up with 2 moles of water.
Mass of water = 2 * 18 g/mol = 36 g
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When baking it is best to use which of the following types of butter
Answer:
unsalted butter
Explanation: because it lets the real natural flavor come through.
A farmer has a bucket of fertilizer that will help her plants grow. She
followed instructions on the fertilizer bucket, which say to change the phase from a
liquid to a solid before adding it to the plants. What happened to the molecules of
fertilizer when it changed phase?
Explanation:
The molecules of the fertilizer after the phase change are more reactive compared to when in solid phase.
These molecules in liquid are more free to move about and not fixed as in a solid. This causes the liquid fertilizer to react faster compared to the solid. The solid molecules are in a fixed shape. In the liquids, they slide on top of one another and are free to move better.A force of 49 Newtons is applied to a rock, which causes it
to be lifted 2 meters in 5 seconds. How much power is
exerted during this time?
Answer:
19.6Watts
Explanation:
Given parameters:
Force applied = 49N
Distance = 2m
Time = 5s
Unknown:
Power = ?
Solution:
Power is the rate at which work is being done;
Power = [tex]\frac{Work done }{time}[/tex]
Work done = force x distance = 49 x 2 = 98J
So;
Power = [tex]\frac{98}{5}[/tex] = 19.6Watts
What is the formula of phosphorus atoms and calcium atoms?
Answer:
Calcium phosphate chemical formula is given as Ca3(PO4)2.
Explanation:
Answer:
Calcium Phosphate is written as Ca3(PO4)2.
Explanation:
How would one convert 36 yd to centimeters 2.54 cm = 1 in)?
Answer:
D
Explanation:
A P E X
D is the correct process to convert 36 yds to centimetres 2.54 cm = 1 in.
What are centimetres?A metric unit of length, equal to one-hundredth of a metre.
To convert a yard measurement to a centimetre measurement, multiply the length by the conversion ratio. The length in centimeters is equal to the yards multiplied by 91.44.
D is the correct process to convert 36 yds to centimetres 2.54 cm = 1 in.
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