Answer:
The attractive force between the sodium and chloride ions has a magnitude of -2.94 x 10⁻⁹ N
Explanation:
An electron is a negatively-charged particle. The charge on an electron is -1.6 x 10⁻¹⁹ C. This is also known as the fundamental unit of charge, e. A proton has the same charge as as electron but its charge is positive.
The charge on the chloride ion is negative and is due to an electron whereas the charge on the sodium ion is positive and is due to a proton.
The magnitude of the force of attraction between two charges is given by the Coulomb's law: F = Kq₁q₂/r²
where K is a constant = 9 x 10⁹ N.m₂.C⁻², q₁ = -1.6 x 10⁻¹⁹ C, q₂ = +1.6 x 10⁻¹⁹ C, r = 0.28 nm = 0.28 x 10⁻⁹ m
F = {(9 x 10⁹ N.m₂.C⁻²) (-1.6 x 10⁻¹⁹ C) (+1.6 x 10⁻¹⁹ C)} / (0.28 x 10⁻⁹ m)²
F = -2.94 x 10⁻⁹ N
Therefore, the attractive force between the sodium and chloride ions has a magnitude of -2.94 x 10⁻⁹ N
Naturally occurring silicon consists of three isotopes with the following isotopic masses and abundances. Isotope Isotopic mass (u) Abundance (%) 2828 Si 27.976926532727.9769265327 92.229792.2297 2929 Si 28.9764947228.97649472 4.68324.6832 3030 Si 29.9737702229.97377022 3.08723.0872 Calculate the average atomic mass of naturally occurring silicon to at least four significant figures.
The question is incomplete, the complete question is;
Silicon has three naturally occurring isotopes with thefollowing masses and natural abundances:
Isotope Mass ({\rm amu}) Abundance (%)
{\rm Si}-28 27.9769 92.2
{\rm Si}-29 28.9765 4.67
{\rm Si}-30 29.9737 3.10
Calculate the atomic mass of silicon.
Answer:
28.09 amu (to four significant figures)
Explanation:
Given that;
Isotope Mass Abundance (%)
Si-28 27.9769 92.2
Si-29 28.9765 4.67
Si-30 29.9737 3.10
So we now have;
Relative atomic mass of silicon;
(27.9769 × 0.9218) + (28.9765 × 0.0471) + (29.9738 × 0.0312)
25.789 + 1.365 + 0.9351 = 28.09 amu (to four significant figures)
The substance krypton has the following properties normal melting point 115.9 K normal boiling point: 119.8 K triple point: 0.72 atm. 115.8 K critical point: 54.3 atm. 209.4 K A sample of krypton at a pressure of 1.00 atm and a temperature of 149.2 K is cooled at constant pressure to a temperature of 107.8 K Which of the following are true?
a) The final state of the substance is a solid
b) One or more phase changes will occur
c) The final state of the substance is a liquid
d) The sample is initially a gas
e) The solid initially present will vaporize.
Answer:
B. One or more phase change occur
C. the final state of substance is liquid
D. the sample initially gas
Explanation:
The pressure p = 1.00 atm
The temperature t = 149.2K
The temperature > 119.8K
119.8K being the normal boiling point.
This shows that the krypton is a gas
After it has cooled the pressure = 1.00 atm
The temperature T dropped to 107.8K
T < 115.9K
The melting point has been put as 115.9K
This is a liquid. The final state of the substance is a liquid. Since the temperature is less than the melting point and the pressure is 1.00 atm
[2071]State and explain Kohlrusch's law.
(2071]Why does the specific conductance decreases and equivalent conductance increase
with dilution of a solution of electrolyte?
ito unit How does it Vary with dilution?
1101
which of the following is NOT a function of the skeletal system?
A. supports the body
B. gives shape to the body
C. enables the body to move
D. yransports nlood throughout the body
Answer:
A yan hehehehe
salamat puso ma ah
1)
If I have 45 liters of helium in a balloon at 25°C and increase the
temperature of the balloon to 55° C, what will the new volume of the
balloon be?
Answer:
52.8 Liters
Explanation:
Gay-Lussacs law states that P1/T1 = P2/T2
if:
P1 = 45T1 (in Kelvins) = 25 + 273.1 =298.1P2= ?T2 = 55 + 273.1 = 328.1then:
45/298.1 = P2/328.1
P2 = 52.8
The new volume of the balloon is 52.8 Liters this can be calculated by using gas laws.
Charles law:Charles law states the volume occupied by a fixed amount of gas is directly proportional to its absolute temperature. It is given by
V₁/T₁ = V₂/T₂
What information do we have?
V₁ = 45 L
T₁ = 25 + 273.1 =298.1 K
T₂ = 55 + 273.1 = 328.1 K
To find:
V₂= ?
On substituting the values:
45/298.1 = V₂/328.1
V₂ = 52.8 L
Thus, the volume of the balloon is 52.8 liters.
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Which of the following is an example of chemical weathering?
plant roots splitting rocks
acid dissolving limestone
water breaking rocks
wind breaking down rock
Answer:
Estoy deprimido y odio la vida. Así que sí
FUСR THE WORLD SAY AND TO 4142-414=? HELPPPPPPPPPPPPP
Answer:
UMMMMMMMMMMM
Explanation:
Answer:
3729
Explanation:
WILL GIVE BRAINLIEST
Answer:
1. True
2. resting position
3. 5 cm
4. Compressions
5. false
6. 7 m
7. true
8. second one has more amplitude
9. True
10. true
Explanation:
Which statement describes a change that occurs during a chemical reaction?
OA. The atoms in a substance start to move faster until they are no longer touching each other.
OB.
Atoms in the original substances are arranged in a different way to make new substances
OC!
The atoms in a substance change their properties so they can become a new substance.
OD.
Atoms in the original substances are changed into different atoms to make new substances,
Answer - B Atoms in the original substances are arranged in a different way to make new substances
PLS HELP GIVING 100 PTS EASY SCIENCE HELP PLS
Answer:
B hope it helps
Explanation:
US
What is the percent of H in
NH3?
(H = 1.008 amu, N = 14.01 amu)
[?]%
Answer:
17.6
Explanation:
Answer is explained above
Directions: Select the words that make the sentence a true statement Below is a food web showing the flow of energy through a marine ecosystem marine mammals tuna fish aquida craba zooplankton amall fishes doad animal material 3 phytoplankton In this ecosystem are considered predators and are their prey
Answer: in this ecosystem tuna fish are considered predators and small fishes are their prey.
Explanation: This is just an easy smart guess why? because the Tuna fish(predator) eat the small fishes(prey) as if what it looks like in the chart.
Im not sure about this question but i hope this helps
Answer:
in this ecosystem tuna fish are considered predators and small fishes are their prey.
Explanation:
A 50.0mL flask filled with a solution of hydrogen peroxide has a total mass of 88.5 g. The mass of the flask is 16.5 g. The density of the hydrogen peroxide solution is
Answer:
1.44 g/mL
Explanation:
total mass is mass of the flask plus mass of the solution
TM = Flask + H2O2
88.5 = 16.5 + x
x = 72.0 gram
density = mass/volume
H2O2 density = 72/50
= 1.44 g/mL
To convert between units, you need to know the relationship between units. For example, one mile equals 5280 feet. This relationship can now be used as a conversion factor, set up as required by the question. For each conversion, choose the correct arrangement of the conversion factor and complete the calculation 1. Convert 7860 feet to miles 7860 feet x (A)
A: 1 mile
B: 5280 feet 7860 feet miles 2. Co 0.5 miles to feet 0.565 miles x (C) TD
C: Choose...
D: Choose 0.565 miles feet
Answer:
1. 7860 Feet = 1.488 miles
A= 1
B= 5280
2. 0.565 miles = 2983.2 feet
C= 0.565
D= 1
Explanation:
1. Convert 7860 feet to miles
1 miles= 5280 feet
1 Feet= 1/ 5280 miles
7860 Feet= 7860 ( 1/ 5280) miles
7860 Feet = 1.488 miles
A= 1
B= 5280
2. Convert 0.565 miles to feet
1 mile= 5280 feet
0.565 miles = 5280 feet * (0.565/1)
0.565 miles = 2983.2 feet
C= 0.565
D= 1
We see that when we have to convert feet into miles we divide the number by 5280 because feet are smaller than miles. Similarly when we have to convert miles into feet we multiply by the given number because miles are greater than feet.
The above method used is called the unitary method but we should always keep in mind that conversion from smaller to bigger units require divsion and from bigger to smaller units require multiplication.
Zack and Frankie were planning a game of flashlight tag on both Friday and Saturday night.
Answer:
oKaY?!
Explanation:
4. What are the freezing and boiling points of water on the Fahrenheit scale? On the
Celsius scale?
the reaction between potassium metal and water produces potassium hydroxide and hydrogen gas.
the correct equation for this reaction is:
A: K + H2O—> KOH + H2
B: K + H2O—>KOH + H
C: 4K + 3H2O—> 4KOH + 2H
D: 2K + 2 H2O—> 2KOH + H2
Answer:
2K + 2H₂O → 2KOH + H₂
Explanation:
The reactants are:
Potassium metal = K
Water = H₂O
The products are:
Potassium hydroxide = KOH
Hydrogen gas = H₂
The reaction equation is given as;
Reactants → Products
2K + 2H₂O → 2KOH + H₂
The reaction is a single displacement reaction
Which chemical used to make explosives is a fertilizer-based explosive, but requires nitric acid as a component to be an explosive compound, and has a wide range of uses, including as a noncorrosive de-icing material for sidewalks?
a. Aluminum nitrate
b. Triacetone triperoxide (TATP)
c. Hexamethylene triperoxide diamine (HMTD)
d. Urea nitrate
Answer:
d. Urea nitrate
Explanation:
Urea nitrate is a fertilizer-based explosive that is produced in one step by reaction of urea with nitric acid. The is an exothermic reaction, therefore, necessary steps and precautions must be taken to ensure safety during the process. The equation of the reaction is given below:
(NH₂)₂CO (aq) + HNO₃ (aq) → (NH₂)₂COHNO₃ (s)
It is as easily-made explosive and can also be used as a catalyst in Diels-Alder reactions of aromatic amines.
In the presence of water, urea nitrate readily decomposes to its original components, urea and nitric acid.
On its own, urea is commonly used as a deicer for sidewalks as it is a noncorrosive de-icing material. However, it is a more costly method of deicing, compared to other methods and it is best used where water runs off into vegetation than into a water-body or a storm drain because of its high-oxygen demand which could result in its reducing the oxygen level of the water body. It It is readily found in nature (in our urine) and is also synthesized artificially. It has a very high nitrogen content, and is most often used as a nitrogen‐based fertilizer.
If a wave is traveling at 36 m/s and has a frequency of 6 Hz, what is its wavelength?
Answer:
wave length=speed*frequency
=36*6
=216 m
Select the correct balanced equation for the double displacement reaction of calcium carbonate and hydrochloric
acid (Rolaids and stomach acid)
CaCO3 + HCL -> CaCl2 + H2CO3
Answer:
B: CaCO3 + 2HCl -> CaCl2 + H2CO3
Explanation:
CaCO3 + HCl -> CaCl2 + H2CO3Count how many elements they are in all molecules for the reactants and for the products.
For the reactants:Ca = 1 element
C = 1 element
O = 3 elements
H = 1 element
Cl = 1 element
For the products:Ca = 1 element
Cl = 2 elements
H = 2 elements
C = 1 element
O = 3 elements
To balance this equation, we need to add 1 more element of Chlorine and Hydrogen. Therefore, we add a 2 to the coefficient of HCl for the reactants side.
Now let us try it.
CaCO3 + 2HCl -> CaCl2 + H2CO3Count how many elements they are in all molecules for the reactants and products.
For the reactants:Ca = 1 element
C = 1 element
O = 3 elements
H = 2 element
Cl = 2 element
For the products:Ca = 1 element
Cl = 2 elements
H = 2 elements
C = 1 element
O = 3 elements
All of the elements are balanced.
So the final answer is B: CaCO3 + 2HCl -> CaCl2 + H2CO3Hope it helped!
C3H8 + 5 O2 → 3 CO2 + 4 H2O
a. 3.80 moles of oxygen are used up in the reaction. How many grams of water are produced?
b. How many grams of oxygen does it take to produce 90.6 grams of Carbon Dioxide?
Answer:
¹/3 C3H8(g) + ⁵/3 O2(g)
Explanation:
The coefficient before every molecule is representative of the number of moles. We can represent it in ration form so as to calculate the question;
C₃H₈(g) + 5 O₂(g) → 3 CO₂(g) + 4 H₂O(l) means;
For every 1 mole of C₃H₈(g) and 5 moles of O₂(g) produces 3 moles of CO₂(g) and 4 moles of H₂O(l).
Therefore to produce 1.00 mole of CO₂(g);
We represent it in ratio;
C₃H₈(g) : CO₂(g)
1 : 3
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We can write:
5/4 = 3,8/x
Solving for x:
x = 3,04 mols of H2O
Calculating the H2O mass:
M H2O = 18 g/mol
n = m/M
Solving for m:
m = 54,72 g of water
****************************
Using the same, but with molar mass:
M CO2 = 44 g/mol => 3 x 44 = 132 g
M O2 = 32 g/mol => 5 x 32 = 160 g
160/132 = x/90,6
solving for x:
x = 109,82 g if CO2
How many parents does asexual reproduction involve?
Answer:
only 1 parent is needed! and the offspring is a identical copy of the parent
What is the definition of an atmosphere? a portion of the electromagnetic spectrum that makes the sky look blue the blanket of gases that surrounds Earth and some other planets an area above Earth that scatters sunlight into all colors of the rainbow
Answer:
the blanket of gases that surrounds Earth and some other planets
Explanation:
The best definition of the atmosphere is that it is a portion of the earth that is a made up of a blanket of gases.
The atmosphere is not peculiar to the earth alone, some other planets also have atmospheric cover. The earth's atmosphere is divided into many different layers. The weather we see and experience on the earth surface is conditioned within the troposphere. This troposphere is the closest layer to the surface.How many grams of iron are needed to produce 3 g of iron(III) chloride?
Answer:
5 its just what i do
Explanation:
What is the relationship between the mass of the boat and the mass of the displaced
liquid?
The mass of the boat is equal to the mass of the liquid which is displaced by placing the boat in the liquid.
What is Archimedes' Principle?
Archimedes' Principle states that the buoyant force of the object is equal to the weight of the water which is displaced by the boat. If the weight of the water that is displaced by the boat is less than that of the weight of the boat, then in this case the boat sinks. Archimedes' principle or the buoyant force is very useful for the calculation of the volume of an object that does not have a regular shape.
The mass of the displaced liquid is always equal to the volume of the liquid multiplied by the density of the fluid. When a boat is placed in the water, the volume of displaced water is equal to the mass of the boat which is placed in it.
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Which macromolecules break apart by hydrolysis?
Answer:
Dehydration synthesis reactions build molecules up and generally require energy, while hydrolysis reactions break molecules down and generally release energy. Carbohydrates, proteins, and nucleic acids are built up and broken down via these types of reactions, although the monomers involved are different in each case.
Explanation:
In the reaction shown below, cobalt ...
Co(s) + Ni (C2H302)2(aq) → Co(C2H302)2(aq) + Ni(s)
A) gains electrons and is reduced
B) loses electrons and is oxidised
C) loses electrons and is reduced
D) gains electrons and is oxidised
B) loses electrons and is oxidised
Its oxidation number is 0 in Co(s) and +2 in Co(C2H302)2(aq), hence it gets oxidised
In the reaction as mentioned below:-
[tex]Co(s) + Ni(C2H302)2aq -- > Co(C2H3O2)2aq + Ni(s)[/tex]
As shown in reaction cobalt losses elections so the reaction is oxidised. Thus, option b is correct.
What is oxidation?Oxidation is a type of reaction in which loss of electrons and gain of protons is takes place during a reaction by molecules, atom or ion. Oxidation takes place when the oxidation state of a molecule, atoms or ion is increased.
The opposite reaction is called as reduction in which gains of electron and loss of protons is takes place . In reduction reaction the oxidation state of molecules, atoms or ion is decreased.
Oxygen has been added to a compound as an older method of oxidation. Although oxygen is typically added to a compound in compliance with the loss of electrons requirements and the oxidation state increase.
Therefore, we can say that in the reaction
[tex]Co(s) + Ni(C2H302)2aq -- > Co(C2H3O2)2aq + Ni(s)[/tex]
As shown in reaction cobalt losses elections so the reaction is oxidised. Thus, option b is correct.
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What is the mass, in grams, of a pure iron cube that has a volume of 3.80 cm?
Answer:
2.66 g of Fe, can be obtained from the reaction
Explanation:
Let's think the reaction:
2Fe₂O₃ + 6CO → 4Fe + 6CO₂
Ratio is 2:4, so If i have x moles of iron (III) oxide, I will produce the double of moles of Fe.
Mass / Molar mass = Mol
3.80 g / 159.7 g/m = 0.0237 moles
0.0237 moles . 2 = 0.0475 moles
Molar mass Fe = 55.85 g/m
Mol . Molar mass = Mass → 0.0475 m . 55.85 g/m = 2.66 grams
Explanation:
matter can undergo chemical reactions and nuclear reactions. which properly is conserved in nuclear reactions?
Answer:change in number of atoms
Explanation:AP3X
air is trasferred from 75 L tank where the pressure is 125 psi and the temperature is 288 K to a tire with a volume. of 6.1 L and a pressure of 25 psi. what is the new temperature ?
Answer:
4.7K
Explanation:
Given parameters:
Initial volume = 75L
Initial pressure = 125psi
to atm gives 8.5atm
Initial temperature = 288K
New volume = 6.1L
New pressure = 25psi
to atm gives 1.7atm
Unknown:
New temperature = ?
Solution:
To solve this problem, we use the combined gas law which is given below:
[tex]\frac{P1 V1}{T1}[/tex] = [tex]\frac{P2 V2}{T2}[/tex]
P, V and T are pressure, volume and temperature
1 and 2 are initial and new states
[tex]\frac{8.5 x 75}{288}[/tex] = [tex]\frac{1.7 x 6.1}{T2}[/tex]
T2 = 4.7K