Answer:
The charge carriers can be electrons, as in metals, or positive and negative ions in the case of ionic (or electrolytic) conductors. In a crystalline solid, the potassium and chlorine atoms are ionically-bonded within a crystalline matrix that prevents them from easily moving.
Explanation:
Science Experiment : What can you fit in your mouth?
Answer:
u got a me off guard and thought sum else, lol but um a marble?
Explanation:
At what temperature can 10g of Cez(SO4)3 be dissolved in 100g of water?
A.10
B.20
C.60
D.40
a piece of tin foil has a volume of 0.645 ml to the 3rd if a piece measures 10.0 mm by 12.5 m what is the thickness of the foil
Explanation:
Fundamentally the aluminum foil is a rectangular prism. It has a length, a width, and a thickness.
The volume of a rectangular prism is expressed as
[tex]V = l * w * h[/tex]
If we know the volume and two of the three dimensions, we can rearrange the equation to solve for the thickness.
[tex]h = V/(l*w)[/tex]
But we should also be sure to confirm our units.
A liter is defined as 1000 cm^3. Therefore a mL is equal to 1 cm^3.
You should convert the units of measure given in the problem statement such that the units are aligned. For example, 10.0mm will be 1 cm and 12.5m will be 1250 cm. This will give you a height in cm.
Why burning gasoline in a lawnmower is not physical change
Answer:
Burning gasoline in a lawnmower is a chemical change.
Explanation:
Here, a combustion reaction takes place. Freezing water to make ice cubes, melting gold to make jewellery and boiling water for soup are examples of physical change since, only a change in physical state takes place.
Which interactions and processes contribute to the dissolution of ionic compounds in water?
If we place 15 moles of NaN3, how many
grams of NaN3 do you have before the
reaction?
Answer:
25.8 g C6H12O6
Explanation:
I need help on these chemistry problems
Answer:
15. 2.5 M
16. 2.5 moles
17. 0.128 M
18. 56 g
Explanation:
15. Determination of the molarity of NaOH.
Mole of NaOH = 2.5 moles
Volume = 1 L
Molarity =?
Molarity = mole /Volume
Molarity of NaOH = 2.5 / 1
Molarity of NaOH = 2.5 M
16. Determination of the number of mole of solute.
Volume = 1 L
Molarity = 2.5 M
Mole of HCl =?
Molarity = mole /Volume
2.5 = mole of HCl /1
Mole of HCl = 2.5 moles.
17. Determination of the molarity of Na₂S
We'll begin by calculating the number of mole in 20 g of Na₂S. This can be obtained as follow:
Mass of Na₂S = 20 g
Molar mass of Na₂S = (23×2) + 32
= 46 + 32
= 78 g/mol
Mole of Na₂S =?
Molar = mass / molar mass
Mole of Na₂S = 20 / 78
Mole of Na₂S = 0.256 mole
Finally, we shall determine the molarity of Na₂S. This can be obtained as follow:
Mole of Na₂S = 0.256 mole
Volume = 2 L
Molarity of Na₂S =?
Molarity = mole /Volume
Molarity of Na₂S = 0.256 / 2
Molarity of Na₂S = 0.128 M
18. Determination of the mass of solute.
We'll begin by calculating the number of mole solute (CH₄) in the solution. This can be obtained as follow:
Volume = 1 L
Molarity of CH₄ = 3.5 M
Mole of CH₄ =?
Molarity = mole / Volume
3.5 = mole of CH₄ / 1
Mole of CH₄ = 3.5 moles
Finally, we shall determine the mass of the solute (CH₄). This can be obtained as follow:
Mole of CH₄ = 3.5 moles
Molar mass of CH₄ = 12 + (4×1)
= 12 + 4
= 16 g/mol
Mass of CH₄ =?
Mole = mass /Molar mass
3.5 = Mass of CH₄ / 16
Cross multiply
Mass of CH₄ = 3.5 × 16
Mass of CH₄ = 56 g
***Question in photo***
Is the entropy positive or negative in this question?
Answer:
Enthalpy change is negative
Entropy change is Positive
Explanation:
2. How do the ancient Greek model and Ptolemy's model differ?
Answer:
Greek's Model used stars while Ptolemy did not use stars.
Explanation:
The Greek model had stars as part of the system and they revolved around the Earth. Ptolemy's model did not include the stars, but it did include the moons that revolves around the planets.
1s2 2s2 2p6 3s2 3p6 4s2 3d 10 4p6 5s2 4d7 element electron configuration?
Answer:
antimony
Explanation:
The representation of the electrons in the shell is called electronic configuration.
The correct answer is antimony
The shell is as follows:-
SPDFThese are the shells in which electrons are filled.
The total number of electrons is 2+2+6+2+6+2+10+6+2+7= 45
After calculating the electrons, the total number of electrons is 45 which is the atomic number of antimony.
Hence, antimony is the correct option.
For more information, refer to the link:-
https://brainly.com/question/15804584
Which of these factors does not affect the climate?
1. Proximity to Water
2. Ocean Currents
3. Latitude
4. Puddles
5. Global Winds
6. Elevation
Answer:
id say 4
Explanation:
hope this is right!
-Jules
What is the percent composition of silicon dioxide, SiO2 ? (Atomic masses : O = 16 . 0 Si =28 .1
Answer:
60.1 i think
Explanation:
4. Which of the following elements should be the best conductor of electric current?
Aluminum
Nitrogen
Helium
Phosphorus
Answer:
Aluminium
Explanation:
Answer:
aluminum because all the other three are not metals or conductors
Explanation:
Element X has two naturally occurring isotopes, 65X (isotopic mass 65.0457 amu, abundance 20.53%) and 67X (isotopic mass 66.9704 amu, abundance 79.47%). Calculate the atomic mass of element X.
Answer:
66.5753 amu
Explanation:
From the question given above, the following data were obtained:
Isotope A (⁶⁵X):
Mass of A = 65.0457 amu
Abundance of A = 20.53%
Isotope B (⁶⁷X):
Mass of B = 66.9704 amu
Abundance of B = 79.47%
Atomic mass of X =?
The atomic mass of X can be obtained as follow:
Atomic mass = [(mass of A × A%)/100] + [(mass of B × B%)/100]
= [(65.0457 × 20.53)/100] + [(66.9704 × 79.47)/100]
= 13.3539 + 53.2214
= 66.5753 amu
Therefore, the atomic mass of X is 66.5753 amu.
Element X, with an atomic mass of 66.58 amu, has 2 naturally occurring isotopes, ⁶⁵X (65.0457 amu, 20.53%) and ⁶⁷X (66.9704 amu, 79.47%).
What is the average atomic mass?The average atomic mass (atomic mass) of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance.
Element X has 2 isotopes:
⁶⁵X with an isotopic mass of 65.0457 amu and an abundance of 20.53% (0.2053).⁶⁷X with an isotopic mass of 66.9704 amu and an abundance of 79.47% (0.7947).We can calculate the average atomic mass of X using the following expression.
mX = m⁶⁵X × ab⁶⁵X + m⁶⁷X × ab⁶⁷X
mX = 65.0457 amu × 0.2053 + 66.9704 amu × 0.7947
mX = 66.58 amu
Element X, with an atomic mass of 66.58 amu, has 2 naturally occurring isotopes, ⁶⁵X (65.0457 amu, 20.53%) and ⁶⁷X (66.9704 amu, 79.47%).
Learn more about atomic mass here: https://brainly.com/question/6200158
What was a key discovery in the advancement me up early information transfer
Answer:
The transfer was essential to understand the mutation and the possibility of new, more resistant strains in microorganisms.
Explanation:
the transfer of microorganisms is based on the transfer of genetic data through conductive pathways that penetrate the membranes, called pili or genetic bridges.
These mutated genes with higher resistance are transmitted and resistance is generated in entire populations and even species.
What are advantages of specialization
Answer:
ACE
Explanation:
Defined skill set: When we say advantages it is seen that it can be visualized during the early stages of one’s career.
Upward growth: Having a specific skill or being specialized in that work would also bring growth in that division. ...
Good package: A job specialization means a person is knowing how to do that work and complete it.
The position of hydrogen is controversial in mendeleevs periodic table?
A living thing must respond to the environment, has needs, grows, must be 1 point
able to reproduce, breathes/respirates, and is made of one or more cells. *
True
False
if you move 60 meter in 10 seconds, what is your speed
the answer was S=d/t = 60/10 = 6m/s, I'm sorry for getting it wrong the first time I answered ^^
4. How many moles of oxygen gas are needed to react completely with
3.0 moles of C2,H6.?
Hey there!:
Mole ratio :
2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O
2 moles C₂H₆ -------------------- 7 moles O₂
3.0 moles C₂H₆ ------------------ moles O₂ ??
moles O₂ = 3.0 x 7 / 2
moles O₂ = 21 / 2
moles O₂ = 10.5 moles of O₂
Hope this helps!
answer this I hope you can see it
Answer:
Explanation:
Dry I can't c it
How many moles are equal to 13.25 g of water, H2O?
Answer:
0.736 moles
Explanation:
mole = mass/molecular mass
mole of H2O = 13.25/18.0
mole of H2O = 0.736
15. In the chemical equation H2O2(aq) → H2O(0) + O2(g), the O2 is a
Answer:
oxygen
if it's helpful ❤❤
A book is resting on a table. The mass of the book is 10 kg. The acceleration of gravity
is 9.8 m/s2. Calculate the force the book exerts on the table.
Answer:
98N
Explanation:
fg=mg
=(10)(9.8)
=98N
NO(g) and O2 (9) react to form NO2(9). The rate law of the reaction is rate = k[NO]° [02]. If the reaction occurs in a single elementary step that is a three-body molecular collision, then which of the following is the equation for the elementary step?
Answer:
B, 2NO + O2 --> 2NO2
Explanation:
The exponents in the rate law for an elementary step are equal to the stoichiometric coefficients of the particles in the equation for the elementary step. Therefore, the elementary reaction must be between two NO molecules and one O2 molecule.
The elementary reaction of the three-body molecular collision is 2NO + O2 -----> 2NO2
The rate of reaction refers to how fast or slow a reaction occurs. The rate equation for an elementary reaction involves the concentration of the species raised to the power of their respective molar coefficients.
We are told that the rate law of the reaction is given as; Rate = k[NO]^2 [O2]. This implies that the single elementary step that is a three-body molecular collision, is represented by the equation; 2NO + O2 -----> 2NO2.
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I need help asap please help me
Answer:
the answer is the third one the beak
A 1.00-L flask was filled with 2.00 moles of gaseous and 2.00 moles of gaseous and heated. After equilibrium was reached, it was found that 1.21 moles of gaseous was present. Assume that the reaction
SO2 + NO2 ⇌ SO3 + NO
occurs under these conditions. Calculate the value of the equilibrium constant, K, for this reaction.
Answer:
2.35
Explanation:
A 1.00-L flask was filled with 2.00 moles of gaseous SO₂ and 2.00 moles of gaseous NO₂ and heated. After equilibrium was reached, it was found that 1.21 moles of gaseous NO was present. Assume that the reaction
SO₂ + NO₂ ⇌ SO₃ + NO
occurs under these conditions. Calculate the value of the equilibrium constant, K, for this reaction.
Step 1: Calculate the molar concentrations
Since the reaction takes place in a 1.00 L flask, the molar concentrations are:
[SO₂]i = 2.00 M
[NO₂]i = 2.00 M
[NO]eq = 1.21 M
Step 2: Make an ICE chart
SO₂ + NO₂ ⇌ SO₃ + NO
I 2.00 2.00 0 0
C -x -x +x +x
E 2.00-x 2.00-x x x
Step 3: Calculate the concentrations at equilibrium
The concentration of NO at equilibrium is 1.21 M. Then, x = 1.21.
[SO₂]eq = 2.00-1.21 = 0.79 M
[NO₂]eq = 2.00-1.21 = 0.79 M
[SO₃]eq = x = 1.21 M
[NO]eq = x = 1.21 M
Step 4: Calculate the value of the equilibrium constant, K, for this reaction
K = [SO₃] × [NO]/[SO₂] × [NO₂]
K = 1.21²/0.79² = 2.35
What is the mass of 4.42 cm3 of platinum? The density of platinum is 22.5 g/cm3. (Sig Fig rules + units)
Answer: 99.45 g
Explanation: we have 22.5 g of Platinum in every 1cm3 of Platinum so if we take 4.42 cm3 of Platinum we will have 4.42 × 22.5 g = 99.45 g of Platinum
Which of the following is most likely to produce heat energy?
A
Momentum
B
Convection
C
Interaction
D
Magnetism
Answer:
B.Convection
the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
Answer:
B.
Explanation:
QUESTION 5
How many molecules are in 5.47E0 moles of carbon dioxide?
Answer:
6.02 x 10²³molecules
Explanation:
From the problem statement, we have been given the number of moles of the carbon dioxide to be 5.47°;
Any number raised to the power of 0 is 1,
So,
The number of carbon dioxide is 1
From mole concept;
1 mole of any substance contains 6.02 x 10²³molecules
The number of molecules in the carbon dioxide is 6.02 x 10²³molecules
