Answer:
B. 2
Explanation:
A double covalent bond is where two pairs of electrons are shared between the atoms rather than just one pair
B
A Double bond is when two atoms share two pairs of electrons with each other. It is depicted by two horizontal lines between two atoms in a molecule
A solenoid is a coil of wire that produces a magnetic field when carrying an electric current. The strength of the magnetic field
produced by a solenoid can be increased in two basic ways: increasing the number of loops in the solenoid or increasing the
amount of current running through the solenoid. A solenoid's magnetic field can be increased to an even greater degree by wrapping
the wire around a material that can be magnetized. Four solenoids are shown below.
000000000000000
Solenoid A
Copper Wire Only
Current: 6 amps
Solenoid B
Copper Wire Only
Current: 8 amps
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ཤགས་
Solenoid C
Copper Wire + Iron Core
Current: 6 amps
Solenoid D
Copper Wire + Iron Core
Current: 8 amps
Based on the strength of the magnetic fields they produce, arrange the solenoids from strongest to weakest.
Solenoid A
Solenoid B
Solenoid C
Solenoid D
Answer: Motion, providing a burst of power that can move a specific part of the device.
Explanation: Hope this helps
Answer:
D > C > B> A
Explanation:
i solved this on study island
Which kind of bond is formed when two atoms share electorons to form a molecule
Answer:
Covalent bond is formed by mutual sharing of electrons between two atoms
Explanation:
A chemist is identifying the elements present in a sample of a sea water. What characteristics of an element's
atoms always determines the element's identity?
A.
B
C.
D
The number of protons
The number of neutrons
The location of valence electrons
The number of valence electrons
Answer:
The number of valence electrons
2. When an atom loses an electron, it becomes a
_a._positive ion.
c. neutral ion.
b. negative ion.
d. neutral atom.
Answer:
A
Explanation:
Atoms of elements can lose or gain electrons making them no longer neutral, they become charged. A charged atom is called an ion. When an atom loses electron(s) it will lose some of its negative charge and so becomes positively charged. A positive ion is formed where an atom has more protons than electrons.
how do enzymes help with digestion
Answer: Digestive enzymes play a key role in breaking down the food you eat. These proteins speed up chemical reactions that turn nutrients into substances that your digestive tract can absorb. Your saliva has digestive enzymes in it
Explanation:
If 250J of energy from the Sun hits the
atmosphere at a certain place, but only 128J
makes it to the surface of the Earth, how much
energy is reflected by the atmosphere?
For the equation BaCl2 + Na2SO4 → BaSO4 + 2NaCl, how many chlorine atoms are on the reactants side and on the products side?
reactants: 1; products: 1
reactants: 1; products: 2
reactants: 2; products: 1
reactants: 2; products: 2
Answer:
The balanced chemical reaction is written as follows:
bacl2 + na2so4 → baso4 + 2nacl
Therefore, the number of chlorine atoms in the reactants side and the products side would be 2 atoms in both sides which should be the case because the number of atoms in each side should have the same number.
Explanation:
Internet
How does a thermometer measure temperature?
What is the Molar Mass of BaCl2?
12. What is the mass number of an atom that has 4 protons, 4 electrons, and 5 neutrons?
Answer:
9
Explanation:
mass number = protons + neutrons
= 4 + 5 = 9
what is the systematic name of NaCl
Answer:
The answer is Sodium chloride.
Na is sodium and Cl is chlorine.
Is corona increasing or decreasing the albedo effect? Explain.
Answer:
corona is increasing
.......
Explanation:
.....
Write the full electron configuration of calcium.
152 2s22p6 352 4s2
Use the electron configuration to predict the most likely oxidation state of calcium?
(Explain your answer please)
Answer: [tex]1s^22s^22p^63s^23p^64s^2[/tex] , oxidation state = +2
Explanation:
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom. The electrons are filled according to Afbau's rule in order of increasing energies.
The electronic configuartion of Calcium with atomic number 20 is :
[tex]Ca:20:1s^22s^22p^63s^23p^64s^2[/tex]
As calcium can easily lose its two valence electrons to attain stability , its oxidation state is +2.
[tex]Ca^{2+}:18:1s^22s^22p^63s^23p^6[/tex]
CaCO3(s)+2H*(aq) →Ca2+ (aq)+H2001+CO262)
Initial
Initial Concentration
Experiment
Massof CaCO3(s) (grams) of Haq) (M)
1
5.00
1.0
2
5.00
2.0
Initial Temperatureof
Reactants (°C)
25.0
25.0
The initial rate of formation of CO2(e) from the chemical reaction represented by the
equation above was studied in two separate experiments. The table above provides the
experimental conditions used. If both experiments are carried out with finely powdered
samples of the solid and 50.0mL of HCl(aq), which experiment, if any, will have the faster
initial rate of formation of CO2(g) and why?
The rate of formation of CO2(g) will be the same because the mass of CaCO3(s) and the volume of
HCl(aq) used will be the same in both experiments.
CO2(g) will be formed at a faster rate in experiment 2 because more H* particles can react per
unit time.
O CO26) will be formed at a faster rate in experiment 1 because the proportion of CaCO3(s)
particles to H* particles will be greater.
The rate of formation of CO2(e) will be the same because the surface area of the solid and the
average kinetic energy of the particles will be the same in both experiments.
Answer:CO2(g) will be formed at a faster rate in experiment 2 because more H+ particles can react per unit time
Explanation:
[tex]CO_2_{(g)}[/tex] will be formed at a faster rate in experiment 2 because more H+ particles can react per unit time. The correct option is C.
What is a chemical reaction?A chemical reaction is a process that transforms one or more substances, known as reactants, to one or more different substances, known as products. Chemical elements or compounds are examples of substances.
Combination, decomposition, single-replacement, double-replacement, and combustion are the five basic types of chemical reactions.
Analyzing the reactants and products of a specific reaction will allow you to categorize it. Some reactions will fall into multiple categories.
If both experimental studies are carried out with finely powdered samples of the solid and 50.0mL of HCl (aq), then [tex]CO{_2_{(g)}[/tex] will be formed at a faster rate in experiment 2 because more H+ particles can react per unit time.
Thus, the correct option is C.
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A stone weighs 105 lb in air. When submerged in water, it weighs 67.0 lb. Find the volume and specific gravity of the stone.
(C)
C21H44 can be cracked to produce ethene.
Cz1H44 — 3C2H4 + C15H32
Relative formula mass (M) of C21H44 = 296
Calculate the mass of C21H44 needed to produce 50.4 kg of ethene.
Answer:
177.3kg C₂₁H₄₄
Explanation:
Based on the chemical reaction:
C₂₁H₄₄ → 3C₂H₄ + C₁₅H₃₂
Where 1 mole of C₂₁H₄₄ produce 3 moles of ethene, C₂H₄.
To solve this question we need to determine the moles of ethene in 50.4kg. 1/3 these moles are the moles of C₂₁H₄₄ that must be added:
Moles Ethene -Molar mass: 28.05g/mol-
50.4kg = 50400g * (1mol / 28.05g) = 1796.8 moles of ethene
Moles C₂₁H₄₄:
1796.8 moles of ethene * (1 mol C₂₁H₄₄ / 3 mol C₂H₄) = 589.93 moles C₂₁H₄₄
Mass C₂₁H₄₄:
589.93 moles C₂₁H₄₄ * (296g / mol) = 177283g =
177.3kg C₂₁H₄₄What is the mass number of 199F?
Answer:
fluorine
Explanation:
hope it helps
What do these words mean ?
a) filtrate
b) residue
I will give him or her brilliant and thank you
I need small and right answer.
Answer:
a) filtrate: a liquid which has passed through a filter.
Explanation:
the other one didnt pop up
If 525 N of force is applied to a 4.5
kg mass, how fast will it accelerate?
Answer:
121.11m/s²
Explanation:
Given parameters:
Force = 525N
Mass = 4.5kg
Unknown:
Acceleration = ?
Solution:
From Newton's second law of motion, we can find the solution to this problem. Using the expression below:
F = m x a
F is the force
m is the mass
a is the acceleration
So'
525 = 4.5 x acceleration
Acceleration = 121.11m/s²
What is the potential energy of a bird sitting in a tree if the bird has a mass of 2Kg and it is 10 meters above the ground?
The potential energy of a bird : 196 J
Further explanationGiven
mass of bird = m = 2 kg
height = h = 10 m
Required
The potential energy
Solution
Potential energy is the energy that objects have because of their position. Usually related to the earth's gravitational force
Can be formulated
PE = m g h
g = acceleration due to gravity ⇒ 9.8 m/s²
Input the value :
PE = 2 kg x 9.8 m/s² x 10 m
PE = 196 J
explain how the removal of thermal energy (heat) from matter affects its particles
Answer:
You can change an object's state of matter by adding or removing thermal energy. When you add thermal energy to an object, these things can happen: Particles move faster
Explanation:
_______________ are filled with special absorbing elements that move up and down between the uranium rods to keep the atoms from getting out of control.
Answer:
The correct answer is - control rods.
Explanation:
Control rods are filled with special absorbing agents such as boron, cadmium, silver, and others to absorb as many neutrons as to control the fission reaction by moving them up and down in between uranium rods.
These control rods are used to prevent the nuclear reaction from getting out of control in the nuclear plant or reactor by absorbing the neutrons and prevent uranium to convert.
10. (a) Describe how the structure of an alloy is different to a pure metal
You can type directly into this text box below: (2)
10. (b) Suggest why coins are not made of pure copper. Do not give cost as a reason.
You can type directly into this text box below: (1)
Grade 5+ 15 marks
Total 27 marks
Um, yea, please help lol
magnesium has two naturally occurring isotopes: magnesium-24 and magnesium-25. if the average atomic mass of magnesium is 24.305 amu, what are the percent abundance's of each isotope?
a. 69.5% and 30.5%
b. 50% and 50%
c. 62% and 38%
d. 0.7% and 0.3%
e. .62% and .38%
Answer:
a. 69.5% and 30.5%
Explanation:
we know there are two naturally occurring isotopes of Mg, Mg-24 and Mg-25.
First of all we will set the fraction for both isotopes
X for the isotopes having mass 25
1-x for isotopes having mass 24
The average atomic mass of Mg is 24.305 amu.
we will use the following equation,
25x + 24 (1-x) = 24.305
25x + 24 - 24x = 24.305
25x- 24x = 24.305 - 24
1x = 0.305
x= 0.305 /1
x= 0.305
0.305 × 100 = 30.5 %
30.5 % is abundance of Mg-25 because we solve the fraction x.
now we will calculate the abundance of Mg-24.
(1-x)
1-0.305 =0.695
0.695 × 100 = 69.5%
69.5% for Mg-24.
If the size of an object decreases, volume does what?
Answer:
I'm pretty sure the volume decreases because the volume is like how much space it takes up. Sorry if im wrong.
How many molecules are contained in 78.41 L of Ne
PLS HELP!!!!! 30 POINTS!!!!
Groups of students weighed three different samples of magnesium sulfate. The samples actually weigh 5.25 grams each. Determine whether each group’s data set is accurate, precise, both, or neither.
Drag the tiles to the correct boxes to complete the pairs.
Answer:
1. accurate but not precise
2. precise but not accurate
3. accurate and precise
4. neither
Explanation:
hope this helps :)
The accuracy is always followed by precision, but a high degree of precision does not imply accuracy. All the accurate results will be definitely precise.
What is accuracy and precision?The accuracy of a determination is defined as the concordance between the result and the true value or most probable value. The precision of a determination is known as the concordance of a series of measurements of the same quantity.
The accuracy expresses the correctness of a measurement while precision of a set of results expresses the reproducibility of a measurement.
Accuracy is related to how close the observed result is to the true value while precision is related to how close the measurements are to each other.
The given measurements are denoted as:
1. Accurate but not precise
2. Precise but not accurate
3. Accurate and precise
4. Neither
Thus accurate results will be precise but precise results may not be accurate.
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List 3 countries known to have poor water quality.
Answer
Ethiopia, Niger, Chad
Exlination-
Calculate the amount of heat released when one bottle (250 g) of water is cooled from 25°C to 30°C. The specific heat of water is 4.18 J/g°C.
Answer: the answer is a
Explanation: glad we have the same troubles Rn hahah
Rolf prepares four solutions using different solutes as shown in the table below.
Which solution is unsaturated?
Solution A
Solution B
Solution C
Solution D
Answer:
Solution A
Explanation:
Correct on Edge Cumulative Review Exam 2021
Have a blessed day
The unsaturated solution is the one where, the amount solute is lower than the solubility at a specific temperature. Hence, the solution A will form an unsaturated solution.
What is unsaturated solution?Unsaturated solutions are those having the lower concentration of solute than the saturation point of the solvent. Whereas, a saturated solution will completely dissolve the solute in its maximum amount and beyond a point the solute cannot be dissolved.
At a specific temperature gradient, if the dissolved solute is equal to the solvent's saturation point it will form a saturated solution. From the given table it is clear that except solution A all solutions have higher amount of solute than the saturation point.
As the solute concentration is higher, the solvent will try to dissolve maximum amount of the solute. Hence, in solution A have only 20 g of solute added but its saturation point is 37 g/100g. THus, the solution forms an unsaturated solution.
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