Answer:
2.5×10^20atoms
Explanation:
number of moles= number of particles/Avogadro's constant
number of particles=Avogadro's constant × number of moles
number of particles=(6.02×10^23) × (4.1×10^-4)
number of particles=2.5×10^20
A solution of copper(II) chloride is added to a solution of sodium sulfide.
Write a balanced equation, and explain what type of reaction occurred and/or how you determined that a reaction occurred. Don't use solubility rules.
Answer:
a,morunoxidice
Explanation:
carbon - tranite>plangose ,finite, finite,MARETE
Add coefficients to balance the equation to make water.
H2(g) +O2 (g)H20 (1)
Answer:
2H2+2O2=2H2O
Explanation:
hope this helps
2.3g of lithium chloride in 500cm3 of solution
Answer:
0.109M
Explanation:
Find molarity of the solution:
Molarity is defined as the ratio between the moles of the solute (Lithium Chloride in this case) per liter of solution. To solve this question we have to find the moles of LiCl and its volume as follows:
Moles LiCl -Molar mass: 42.394g/mol-
2.3g * (1mol / 42.394g) = 0.0543 moles
Volume in liters:
500cm³ * (1L / 1000cm³) = 0.500L
Molarity:
0.0543 moles / 0.500L =
0.109M
Is Ca +O2 ?-->CaO balanced ? explain why or why not
Magnesium metal reacts with oxygen according to the equation: Mg(s) + O2(g) → 2MgO2(s)
Which of the following would increase the rate of the reaction?
grinding the magnesium metal into a fine powder
packing the magnesium tightly at the bottom of the container
forming the magnesium metal into the shape of a sphere
forming the magnesium metal into single, large cube
Answer:
Grinding the magnesium metal into a fine powder. I took the test and got it right.
A radioisotope has a half-life of 5 minutes. What fraction of material would remain after
half an hour?
A 3.5L container has a gas pressure of 5.3atm. If the volume is decreases to 1.4L. What will be the new pressure inside the container?
Answer:
your answer for that problem is 34.5
The table below shows the speed of sound waves from musical sound sources at 20°C.
Which conclusion can be made based on the information in the table?
Wave speed and wave lengths can vary inversely to produce the same frequency.
Frequency and wave speed can vary directly to produce the same wavelength.
Wavelengths and frequency can vary inversely to produce the same wave speed.
Frequency and wave speed can vary directly to produce the same wave speed.
Answer:
C
Explanation:
Wavelengths and frequency can vary inversely to produce the same wave speed
Answer:
C) Wavelengths and frequency can vary inversely to produce the same wave speed.
Explanation:
edge
A 3.0 g sample of a gas occupies a volume of 1.00L at 100C and 740 torr pressure. The molecular weight of the
(Give the same ANSWER for the next TWO problems)
gas is
Answer:
94.2 g/mol
Explanation:
Ideal Gases Law can useful to solve this
P . V = n . R . T
We need to make some conversions
740 Torr . 1 atm/ 760 Torr = 0.974 atm
100°C + 273 = 373K
Let's replace the values
0.974 atm . 1 L = n . 0.082 L.atm/ mol.K . 373K
n will determine the number of moles
(0.974 atm . 1 L) / (0.082 L.atm/ mol.K . 373K)
n = 0.032 moles
This amount is the weigh for 3 g of gas. How many grams does 1 mol weighs?
Molecular weight → g/mol → 3 g/0.032 moles = 94.2 g/mol
What is the value for AG at 300 K if AH = 27 kJ/mol and AS = 0.09 kJ/(mol-K)?
O
A. AG = 54 kJ/mol
O
B. AG=-18 kJ/mol
O
C. AG= 0 kJ/mol
O
D. AG = 27 kJ/mol
Answer:
0 kJ/mol
Explanation:
Step 1: Given data
Enthalpy change (ΔH): 27 kJ/molEntropy change (ΔS): 0.09 kJ/mol.KAbsolute temperature (T): 300 KStep 2: Calculate the Gibbs free energy change (ΔG)
We can calculate the Gibbs free energy change using the following expression.
ΔG = ΔH - T × ΔS
ΔG = 27 kJ/mol - 300 K × 0.09 kJ/mol.K = 0 kJ/mol
Since ΔG = 0 kJ/mol, the process in not spontaneous nor non-spontaneous.
Convert from °C to K. 13°C
Answer:
286.15 Kelvin
Explanation:
Answer:
286.15
Explanation:
Hope this helps, if its correct could you mark me as brainliest please?
How would the number of atoms in a 2.02g sample of hydrogen compare to the number of atoms in a 32.00g sample of oxygen
Answer:
Number of atoms is equal.
Explanation:
1 mol of anything contains NA particles.
NA is known as Avogadro's number, 6.02×10²³
We determined the moles of each compound. Both molecules are dyatomic,
H₂ → 2.02 g . 1mol / 2.016 g = 1 mol
O₂ → 32 g . 1mol / 32g = 1 mol
Both have the same amount of moles.
In conclussion, the number of atoms is the same in both samples.
The Lewis diagram for AlF3 is:
:F:
The electron-pair geometry around the Al atom in AlF3 is
There is/are
lone pair(s) around the central atom, so the geometry of AlF3 is
Submit Answer
Retry Entire Group
9 more group attempts remaining
Answer:
25,000 pairs
Explanation:
Ann is studying acid base neutralization reactions and mixes sodium hydroxide and hydrochloric acid. The reactants were clear,
colorless solution and mixing them produces a clear, colorless final solution and the beaker becomes warm. She knows this reaction
forms liquid water and an aqueous salt based on the neutralization rules as shown by the chemical equation. What physical evidence
indicates that there has been a chemical rea
NaOH(aq) + HCl(aq) - NaClaq) + H2 °C)
图 40)
A)
The solution changes color.
B)
Precipitate formation occurs.
C)
The beaker changes temperature.
D)
Gas bubbles form during the reaction.
Answer:C
Explanation:
Got it right in usatestprep
The physical evidence that indicates that there has been a chemical reaction is that the beaker changes temperature and the correct option is option C.
What is Neutralization reaction?
Neutralization is a chemical reaction in which acid and base react to form salt and water. Hydrogen (H⁺) ions and hydroxide (OH⁻ ions) react with each other to form water.
The strong acid and strong base neutralization have a pH value of 7.
The beaker gets warm which indicates that the reaction between acid and base is an exothermic reaction releasing heat energy into the surroundings.
Therefore, The physical evidence that indicates that there has been a chemical reaction is that the beaker changes temperature and the correct option is option C.
Learn more about Neutralization reaction, here:
https://brainly.com/question/28970253
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In the buffer solution CH3COsH(aq) -> H3O+(aq) + CH3CO2-(aq)
A. H3O+ is an acid, and CH3CO2H is its conjugate base.
B. CH3CO2H is an acid, and CH3CO2- is its conjugate base.
C. H3O+ is an acid, and CH3CO2- is its conjugate base.
D. CH3CO2H is a base, and H3O+ is its conjugate acid
In the buffer solution CH₃COOH (aq) ---> H₃O⁺(aq) + CH₃CO₂⁻(aq):
CH₃CO₂H is a base, and H₃O⁺ is its conjugate acid.
Option D is correct.
What is an acid?An acid is described as a molecule or ion capable of either donating a proton, known as a Brønsted–Lowry acid, or forming a covalent bond with an electron pair, known as a Lewis acid.
From the buffer solution above, H₃O⁺ is the conjugate acid because it donates a proton (H⁺) to a base CH₃CO₂H.
In conclusion, A conjugate acid, within the Brønsted–Lowry acid–base theory, is described as a chemical compound formed when an acid donates a proton (H⁺) to a base.
Learn more about acid at: https://brainly.com/question/25148363
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why does solid silver, Ag, conducts electricity while solid silver chloride, AgCl, does not.
Answer: A solid silver, Ag, conducts electricity because it contains ions or electrons while solid silver chloride, AgCl, does not conduct electricity because AgCl does not dissociate to give ions or electrons.
Explanation:
Solid silver (Ag) is considered to be a good conductor of electricity because there are more number of free electrons or movable atoms are present in it.
As electricity is the flow of ions or electrons. So, more is the number of ions or electrons present in a substance more will be its conductivity.
Whereas solid silver chloride is a precipitate that is insoluble in water and therefore, it will not give ions or electrons.
As a result, silver chloride is not able to conduct electricity.
an organism that gains energy by feeding on other organism is a
A. consumer
B. predator
C. prey
D. parasite
F. host
Answer: the answer is A
Explanation:
Answer:
The answer to your question is, A. consumer.
Explanation:
Any organism that 'consumes' other organisms is a consumer
An atom has 23 protons and 24 neutrons. Write both its NAME and it's SYMBOL using isotope notation.
Answer:
Vanadium is the name and the symbol is V #23
Explanation:
help me pass this test my last day of school is may 26 if you don’t mind I have more questions :)
Answer:
equal
Explanation:
Need help. Will pay if needed, or give away points. CHEMISTRY
Answer:
C. So electrons can flow from one electrode to another
Explanation:
An electrochemical cell is any cell in which electricity is produced by reason of a chemical change.
An electrochemical cell consists of two electrodes, these two electrodes are connected using a wire.
Usually, electrons flow from one electrode to another via this wire thereby enabling the electrochemical processes of oxidation and reduction in the cell to proceed effectively.
2. what is the factor in an experiment that a scientist wants to observe, which may change in response to
the manipulated variable; also known as a dependent variable
Why do the two electrons spend their time equally between both hydrogen atoms? In other words, why can’t one hydrogen just take the other’s electron?
Determine the empirical formula of a compound containing 0.57% hydrogen, 72,1% Todine, and 27.3\% oxygen.
Which of the following processes is not an example of physical weathering?
A. acidification
B. abrasion
C. frost action
D. exfoliation
Answer:
acidification
Answer:
I think its A
Explanation:
Hope this helps: )
A pacemaker:
A. sends electrical impulses to a prosthesis, causing it to move
through brain signals.
B. measures the distance traveled with a prosthetic leg.
C. tracks the speed traveled with a prosthetic leg and adjusts
movements accordingly.
D. sends electrical impulses to the heart, causing it to beat more
regularly
SUEMIT
Deforestation is the act of destroying forests so the land can be used for other purposes. Do you think deforestation increases, decreases, or has no effect on the biodiversity of the forest ecosystem? Explain your answer.
Answer:
deforestation decreases biodiversity of the forest ecosystem
Explanation:
Deforestation has to do with the process of felling trees. This process destroys forest ecosystems. Deforestation is normally carried out for the purpose of development.
An ecosystem is a self supporting unit in which living and non living things interact. The different species of plants and animals found in an ecosystem is called biodiversity.
Since organisms in an ecosystem interact among each other and with their non-living environment, destruction of the trees in the forest ecosystem leads to the loss of certain species present in the ecosystem.
For instance, climbers and animals found on tree tops are normal components of a forest ecosystem. When trees are felled and the forest ecosystem is destroyed across the world, these organisms are threatened. This leads to loss of species or loss of biodiversity.
Answer:
Here’s one possible answer:
Deforestation will likely decrease the biodiversity of the forest ecosystem. It reduces the living space and food sources for some of the organisms. Scarcity of space and food may be a threat to the population of those organisms. Over time, some species may die off, leaving fewer species in the forest.
Explanation:
4. Based on their placement on the periodic table, which of the following is more
reactive?
A.Sodium (Na)
B. Magnesium (Mg)
C. Barium (Ba)
D. Neon (Ne)
down there (pls hurry!!)
THIS IS ALSO PAST DUE PLEASE ANYONE HELP BRINLIEST GIVEN
Explain how limiting growth is advantageous for the goldfish’s survival in a home aquarium
Answer:
I dont know what ur answers are but mine are option a and b fish will not out grow the tank and Concentration of waste in the water does NOT become harmful to the fish.
Explanation:
How many moles of SO3 are in 2.4 *10^23 cules?
Answer:
0.4 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
[tex]n = \frac{2.4 {10}^{23} }{6.02 \times {10}^{23} } = \frac{2.4}{6.02} \\ = 0.3986...[/tex]
We have the final answer as
0.4 molesHope this helps you