Answer: The number of bonds that an element can form is determined by the number of electrons in its valence shell. Similarly, the number of electrons in the valence shell also determines ion formation.
Explanation:
What makes metals, in particular, good conductors of electricity?
A.
the ability of electrons to flow throughout the metal
B.
the absence of charged particles
C.
the high temperatures required to break metallic bonds
D.
the presence of positive and negative ions
Answer:
the answer is A(the ability of electrons to flow through out the metal)
*20 points for anyone who can solve this!*
If the temperature of the water inside of the pressure cooker is greater than 104°C, and the water is still a liquid, then the pressure inside of the pressure cooker must be...
A) less than 1 atm
B) equal to 1 atm
C) greater than 1 atm
What is the value of delta Hrxn for this equation:
NH3(g)+2O2(g)⟶HNO3(g)+H2O(g)
Based on the molar bond enthalpies:
N−H 390
O−O 142
O=O 502
O−H. 464
N−O 201
Answer:
The ΔHrxn for the above equation = 179 kJ/mol
Explanation:
The reaction bond enthalpies are for the reactant;
3 × N-H = 3 × 390 = 1,170 kJ/mol
2 × O=O = 2 × 502 = 1004 kJ/mol
The reaction bond enthalpies are for the product;
3 × N-O = 3 × 201 = 603 kJ/mol
3 × O-H = 3 × 464 = 1,392 kJ/mol
The ΔHrxn for the above equation is therefore;
ΔHrxn = 1,170 + 1,004 - (603 + 1,392) = 179 kJ/mol
The value of [tex]\rm \Delta H_r_x_n[/tex] of the reaction can be 179 kJ/mol.
[tex]\rm \Delta H_r_x_n[/tex] of the reaction can be given by the change in the energy for the bond formation and the energy for the dissociation of the bonds.
The energy for the dissociation of bonds are :
3 N-H bonds = 3 [tex]\times[/tex] 390
3 N-H bonds = 1170 kJ/mol
2 O-O bonds = 2 [tex]\times[/tex] 142
2 O-O bonds = 1004 kJ/ mol.
The total energy for the dissociation of bonds = 1170 + 1004 kJ/mol
The total energy for the dissociation of bonds = 2174 kJ/mol
The energy for the formation of bonds are :
3 N-O bonds = 3 [tex]\times[/tex] 201
3 N-O bonds = 603 kJ/mol
3 O-H bonds = 3 [tex]\times[/tex] 464
3 O-H bonds = 1392 kJ/mol
The total energy for the formation of bonds = 603 + 1392
The total energy for the formation of bonds = 1995 kJ/mol
[tex]\rm \Delta H_r_x_n[/tex] of the reaction = energy for the dissociation of bonds - energy for the formation of bonds
[tex]\rm \Delta H_r_x_n[/tex] of the reaction = 2174 - 1995 kJ/mol
[tex]\rm \Delta H_r_x_n[/tex] of the reaction = 179 kJ/mol.
The value of [tex]\rm \Delta H_r_x_n[/tex] of the reaction can be 179 kJ/mol.
For more information about the [tex]\rm \Delta H_r_x_n[/tex] of the reaction. refer to the link:
https://brainly.com/question/23081977
11. Apply Concepts You weigh a spoonful of baking soda and 10 mL of vinegar. Then you mix them together. You see that there is quite a bit of fizzing. You weigh the products after the reaction and find there is mass missing. Does the loss of mass disprove the law of conservation of mass? If not, how could you prove it? Please help I have to turn this in before midnight on canvas before its locked.
Answer:
The loss of mass does not disprove the law of conservation of mass because the evaporated fizz goes into the air. Same with lakes when there is a big body of water, but it slowly starts to look like a smaller body of water. This is because the water evaporates, but the mass is not destroyed it is just being coverted into gas.
Explanation:
How many miles of sodium chloride are produced when 2.9 grams of sodium iodide reacts? __ mol NaCl
2 Nal(s) + Cl2(g) = 2 NaCl(s) + l2(g)
**Report your answer to the correct number of significant digits!
Answer: I am trying 0.88 if it is correct then I will edit this to say that!
Explanation:
Sort the vocabulary word below. Make sure you have come to live session or watched the 5.03 recording. These words will be important to know for the rest of this unit.
Question 1 options:
This is a flow of electrons (such as the flow of electrons in a wire to light up a lamp).
These stop the electricity from flowing (think rubber and glass).
This is slowing the flow of electrons (the current) and where some of the electrons' energy gets converted into heat.
These allow electricity to flow easily through them (think copper and aluminum).
1.
Electric Current
2.
Resistance
3.
Conductor
4.
Insulator
(Sorry it's such a long question!)
Answer:
Electric Current
This is a flow of electrons (such as the flow of electrons in a wire to light up a lamp).
Insulator
These stop the electricity from flowing (think rubber and glass).
Resistance
This is slowing the flow of electrons (the current) and where some of the electrons' energy gets converted into heat.
Conductor
These allow electricity to flow easily through them (think copper and aluminum).
Water dissolves salt by the process of __ breaking down salt into ions forming a(n) __ solution which conducts electricity.
A. ionization, electrolyte
B. ionization, nonelectrolyte
C. dissociation, electrolyte
D. dissociation, nonelectrolyte
Answer:
b
Explanation:
B.................................................................
Precise measurements are highly reproducible, even if the
measurements are not near the correct value.
TRUE
FALSE
True because you can be precise with the same measurements but they can be not the correct area so
it should be TRUE
Vinegar, CH3COOH can be used to remove limescale deposits.
Describe how vinegar can remove limescale deposits with the aid of a
balanced equation.
The reaction between acids in acetic acid in vinegar reacts with bases of calcium carbonate to form calcium acetate salts
Further explanationCalcium can form deposits on the surface of equipment in contact with water in the form of CaCO₃
vinegar which contains acetic acid can break the bonds between Calcium and Carbonate that form calcium acetate
CaCO₃ + 2CH₃COOH = Ca(CH₃COO)₂ + H₂CO₃
CaCO₃ + 2CH₃COOH = Ca(CH₃COO)₂ + H₂O + CO₂
I need help please and give me an explanation
nobody answers anymore but it's worth a shot, i will give branliest tho.
1. when Sodium reacts violently with water is it a physical or chemical change?
2. Ethanol is clear, is that a physical or chemical change?
solid particles deposit at the base of a vessel why?
Answer: solid particles deposit at the base of the vessel because they are heavy compared to the liquid particles.
Explanation:
8.00x1019 molecules HCN to grams
Answer:
g HCN = MW HCN g/mole HCN * [8.00E19 molecules/6.022E23 molecules/mole HCN] = ??
EmForm = CaxPy
moles Ca = 0.66g / atwt Ca g/mole = ??
moles P = (1.00-0.66)g / atwt P g/mole = ??
x/y = moles Ca / moles P = ?? (express as ratio of two numbers; if both are not intergers multiply each by the same number that make them integers. This ratio gives the empirical formula.
Ca3P2
Plug and SOLVE
Name the following covalent molecules:
SeF
Answer:
do you mean DeF?
Explanation:
what element is Column 1, period 3
Answer:
Sodium (Na)
Explanation:
The element on the periodic table at Column (group) 1, period 3 is Sodium (Na)
What is the energy of a microwave photon that has a frequency of 9.86 x 1012 Hz?
Answer:
6.533 × 10^-21J
Explanation:
The energy of the microwave photon can be calculated using:
E = hf
Where;
E = energy of photon (J)
h = Planck's constant (6.626 × 10^-34 J/s)
f = frequency (9.86 x 10^12 Hz)
Hence, E = hf
E = 6.626 × 10^-34 × 9.86 x 10^12
E = 65.33 × 10^(-34 + 12)
E = 65.33 × 10^(-22)
E = 6.533 × 10^-21J
The energy of the microwave photon is
6.533 × 10^-21J
What is formed when two liquids are combined but do not mix?
Answer:immiscible
Explanation:
When two liquids combine to form a new liquid, we call the liquids “miscible.” When two liquids do not mix together and instead form layers, we call them “immiscible.” The chemical properties of the liquids will determine if they will mix or not.
Summary
How do different materials respond to heat?
Answer:
Conductors easily absorb heat and An insulator does not conduct heat well
Explanation:
The bottom number on the periodic table is called?
Answer:
Atomic mass
Explanation:
Atomic mass ===>Mole weight ....the weight in grams of one mole of the element
13. How many moles of sodium hydroxide are needed to neutralize 50grams of sulfuric acid?
2NaOH H2SO4 → Na2SO4 + 2H2O
Answer:
1.02mole
Explanation:
The reaction equation is given as:
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O
Given:
Mass of H₂SO₄ = 50g
Unknown:
Number of moles of NaOH = ?
Solution:
To solve this problem, we first find the number of moles of the acid given;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of H₂SO₄ = 2(1) + 32 + 4(16) = 98g/mol
Now;
Number of moles = [tex]\frac{50}{98}[/tex] = 0.51mole
From the balanced reaction equation:
1 mole of H₂SO₄ will be neutralized by 2 mole of NaOH
0.51 mole of H₂SO₄ will be neutralized by 2 x 0.51 = 1.02mole of NaOH
Which best explains the statement "It has no definite volume”?
Its atoms can widely spread out.
Its atoms stay closely packed.
It’s highly viscous.
It’s highly crystalline.
Answer:
D
Explanation:
Which accurately labels the lysosome?
W
X
Y
Z
Answer:
The correct answer is X.
Explanation:
Lysosomes are heterogeneous structures present in animal cells which are bound by single membranes. They are of varying shape and size and contains hydrolytic enzymes inside it.
Lysosomal membrane has H⁺ ATPase which pumps H⁺ into the membrane through ATP hydrolysis. This pumping of H⁺ makes the internal pH of lysosome acidic.
Lysosome contains many hydrolytic enzymes like protease, lipase, nuclease, therefore, lysosome protects the cell from pathogens by engulfing it and hydrolyze it by its hydrolytic enzymes.
The process by which substance comes from outside cell and broken down through lysosome is called heterophagy.
3. What type of particles move to create electicity?
Electrical energy is caused by moving particles that have a negative or positive charge. These charged particles are called electrons. The faster the electrons are moving, the more electrical energy they carry. Electrical energy commonly moves through a wire in an electrical circuit.
[tex]\huge\boxed{Electrons.}[/tex]
_____________________________________Explanation...Electrons are particles that move to create electricity. In other words, they are responsible for electric currents. Thus, the answer should be Electrons.
_____________________________________[tex]\boxed{Hope\;i\;helped!}\\\\\\\huge\boxed{Thanks,Plip.}[/tex]
Which of the following statements is true concerning what happens when cold milk is poured into hot coffee?
The cold milk transfers its cold to the coffee, cooling the coffee down.
The cold milk transfers its heat to the coffee, warming the coffee up.
The warm coffee absorbs the cold from the milk, cooling the coffee down.
The warm coffee transfers its heat to the milk, cooling the coffee down.
Answer:
The cold milk transfers its cold to the coffee, cooling the coffee down.
Hope This Helps!
Answer:
The cold milk transfers its cold to the coffee, cooling the coffee down.
Explanation:
Somebody knows a good explanation for quantic numbers in chemistry???
Answer:
No I don't.
Explanation:
LOL!!
The chart shows the time, initial velocity, and final velocity of three riders.
A 4-column table with 3 rows. The first row labeled rider has entries Gabriella, Franklin, Kendall. The second row labeled time with entries 10 seconds, 8.5 seconds, 6 seconds. The third column labeled initial velocity has entries 55, 50, 53.2. The fourth column labeled final velocity has entries 32, 50, 67.
Which best describes the riders' final velocities ?
Gabriella is speeding up at the same rate that Kendall is slowing down, and Franklin is not accelerating.
Gabriella is slowing down at the same rate that Kendall is speeding up, and Franklin is not accelerating.
Gabriella and Franklin are both slowing down, and Kendall is accelerating.
Gabriella is slowing down, and Kendall and Franklin are accelerating.
Answer:
Gabriella is slowing down at the same rate that Kendall is speeding up, and Franklin is not accelerating.
Gabriella is slowing down at the same rate that Kendall is speeding up, and Franklin is not accelerating. Hence option B is correct.
What is acceleration?Acceleration is defined as the speed at which an object's velocity changes over time. The rate at which an item changes its velocity is known as acceleration, a vector quantity. If an object's velocity is changing, it is accelerating. Acceleration can be expressed as
Acceleration = Displacement / Time
Velocity is defined as the pace at which an item changes position while moving in one direction, as seen from a certain point of view and as measured by a specific unit of time. Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path.
Thus, Gabriella is slowing down at the same rate that Kendall is speeding up, and Franklin is not accelerating. Hence option B is correct.
To learn more about acceleration, refer to the link below:
https://brainly.com/question/12550364
#SPJ6
Did the chemical reaction absorb or release energy? How do you know?
Answer:
Explanation:
All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Endothermic reactions absorb energy, and exothermic reactions release energy. The law of conservation of energy states that matter cannot be created or destroyed.
The chemical reaction absorbs energy by comparing the energy received when bonds in the reactants are broken with the energy released when bonds in the products are formed. Exothermic is refers to chemical reactions that release the energy.
What is chemical reaction ?The term chemical reaction is defined as a process that leads to the chemical transformation of one set of chemical substances to another.
If heat is absorbed during the reaction,then the change in enthalpy is positive and if heat is released, then the change in enthalpy is negative.
All chemical reactions contain energy. But, not all chemical reactions release energy. In some chemical reactions, the energy is absorbed rather than released.
Thus, The chemical reaction absorbs energy by comparing the energy received when bonds in the reactants are broken with the energy released when bonds in the products are formed.
To learn more about the chemical reaction, follow the link;
https://brainly.com/question/3461108
#SPJ5
The density of 25.0 g of silver is 10.5 g/cm^3. What's the density of 95.5 g of silver?
Answer:
10.5g/cm³
Explanation:
Since the density of the silver is 10.5g/cm³, any pure sample of silver will have the same value as the density of silver.
Density is the mass per unit volume of a substance.
It is an intrinsic property of matter and does not depend on the amount of matter it contains. Every unique sample of an element or substance will have the same density no matter how big or small they are. So, despite an increase in mass for the given substance, the density will still be the same.The total number of electrons in the outer shell of a sodium atom is?
A. 1
B.2
C.8
D.18
Answer:
1
Explanation:
outershell atoms of an element are also known as valency of that element
so the valency and number of elctron in the outershell of a sodium atom is +1.
hope this will help
mark me as brilliant
ASAP NEED HELP, WILL MARK BRAINLEST, WHEN ASKING A QUESTION I REPEAT DO NOT ASK IT IN THE ANSWER SECTION, THANKS FOR READING. (btw: You have to draw it, then take a picture or screenshot the answer as it cannot be answered via text)
Answer:
Look at the images/files below :) Hope it helps Have a great day!
Explanation:
Answer:
Its F S E F Hope this helped :D