49. What is the Atomic Mass of Magnesium on the Reaction Side of this chemical equation? Mg + Cl2 MgCl2 ? g 719 95.3g
Answer:
[tex]molar \: mass = 24g[/tex]
find the pH of
2.1 x 10-3 [HCI]
Answer: pH = 2.68
Explanation: pH = - log[H3O^+] .
HCl reacts with water : HCl + H2O -> Cl^- + H3O^+
So [H3O^+] = c(HCl) = 0.0021 M
pH = - log(0.0021) = 2.68
3. Which of the following affects the angle at which the sun's rays hit Earth?
a. weather
b. latitude
c. sea level
d. wind
Answer:weather
Explanation:
II. The student then takes a 1.00 M stock
solution of table sugar
(sucrose, C12H22011) and mixes 0.305 L
of stock solution with additional
distilled water to create a dilute
solution with a total volume of 1.25 L.
• Explain how the student can
determine the molarity of the
resulting solution. Show a valid
calculation for the final molarity.
Answer:
0.244 M.
Explanation:
From the question given above, the following data were obtained:
Molarity of stock solution (M₁) = 1 M
Volume of stock solution (V₁) = 0.305 L
Volume of diluted solution (V₂) = 1.25 L
Molarity of diluted solution (M₂) =?
The molarity of the diluted solution can be obtained by using the dilution formula as illustrated below:
M₁V₁ = M₂V₂
1 × 0.305 = M₂ × 1.25
0.305 = M₂ × 1.25
Divide both side by 1.25
M₂ = 0.305 / 1.25
M₂ = 0.244 M
Thus, the molarity of the diluted solution is 0.244 M
What is the universe made of? Astronomers face an embarrassing conundrum: they don't know what 95% of the universe is made of.
Answer:
I think u understand this answers
For a lake in Michigan, researchers have determined that largemouth bass feed on smaller fish, which in turn feed on zooplankton. In 2016, there was 600,000 kg of zooplankton in the lake. In 2017, an accidental runoff of insecticide near the lake caused a 50 percent decline of the zooplankton population in the lake. Assuming 10 percent trophic efficiencies, what is the expected decline in largemouth bass?
(a) 1,000 mg.
(b) 1,500 kg.
(c) 2,000 kg.
(d) 3,000 kg.
Answer:
the expected decline in largemouth bass is 3,000 kg.
Option d) 3,000 kg is the correct answer.
Explanation:
Given the data in the question;
In 2016, there was 600,000 kg of zooplankton in the lake.
In 2017, an accidental runoff of insecticide near the lake caused a 50 percent decline of the zooplankton population in the lake.
Now,
The remaining mass of zooplankton after the 50% decline will be;
⇒ 600,000 kg zooplankton × 50%
⇒ 600,000 × 50/100
⇒ 300,000 kg of zooplankton
Now, with 10 percent trophic efficiency; smaller fish directly feed on zooplankton; decline in smaller fish mass will be;
⇒ 300,000 kg × 10%
⇒ 300,000 × 10/100
⇒ 30000 kg
Finally, with 10 percent trophic efficiency, largemouth bash directly feed on smaller fish, so the expected decline in mass of largemouth bash will be;
⇒ 30000 kg × 10%
⇒ 30000 kg × 10/100
⇒ 3,000 kg
Therefore, the expected decline in largemouth bass is 3,000 kg.
Option d) 3,000 kg is the correct answer.
why does methane exist as a gas and nonane exist as liquid
Answer:
Molecular weight
Explanation:
The difference in the physical state of nonane vs methane at STP. Methane is a very small molecule with a molecular weight of 16 g/mol. It exists as a gas at standard temperature and pressure. Nonane is a much larger molecule with a molecular weight of 128.2 g/mol. It exists as a liquid at standard temperature and pressure.
All gasses at STP are Made of small molecular weight molecules. The smaller a molecule, the more movement the individual atoms have. The increased movement of smaller molecules allows them to have more space between individual molecules. The increased molecular motion and space between molecules is one of the main differences between a gas versus a liquid or solid. The larger nonane molecules have less molecular motion and so are can be closer together and so exist as a liquid instead of a gas.
The equation shows neutralization of an acid and a base to produce a salt and water
Answer:
tRUE??
Explanation:
An electrochemical cell is made up of an Zn2+/Zn half-cell and an Ag+/Ag half-cell. If the mass deposited at the silver electrode is 0.50 g, calculate the mass lost at the zinc electrode.
Answer:
hi how are you doing today Jasmine
Is vinegar acidic, alkaline or neutral?
Answer:
Substances over 7 are categorized as basic, with 7 being the neutral point. Water has a pH level of 7. Substances with pH levels under 7 are categorized as acidic. Vinegar is acidic.
Explanation:
You can change it a little if you want. Hope this helps!
Vinegar is acidic. The only vinegar that has alkaline is apple cider vinegar, but all types of vinegar are acidic.
Explain how to identify a conjugate acid and a conjugate base in an acid base reaction.
Answer:
- Identify the acid and base in the reaction.
- What is left of the base after the reaction is known as the conjugate acid, while what is left of the acid after the reaction is known as the conjugate base.
Explanation:
Types of acids and bases:
When we are looking at conjugate acid and base, the type of acid and base we should focus on are Brønstead acid and base.
Brønsted acid: proton donor
Brønsted base: proton acceptor
Do note that proton here refers to hydrogen ion, H⁺.
Other types of acids and bases includes arrhenius acid/base and Lewis acid/base.
Definition:
Conjugate acid is what remains of the acid when a Brønsted acid donates a proton, while conjugate base is the newly formed protonated species when a Brønsted base accepts a proton.
Example:
Let's look at an example of a Brønsted acid-base reaction:
NH₃(aq) +H₂O(l) ⇌ NH₄⁺(aq) +OH⁻(aq)
Here, the base is NH₃ and the acid is H₂O.
NH₄⁺ is the conjugate acid, while OH⁻ is the conjugate base.
Note:
For a Brønsted acid- base reaction, whether a substance behaves as an acid or a base depends on what it is reacting with. Although H₂O behaves as an acid in this example, it behaves as a base when reacting with HCl.
27.5 mL of a 0.235 M potassium hydroxide solution is required to completely react with 35.0 mL of a sulfuric acid solution. Provide the balanced chemical equation for this reaction and determine the concentration of the sulfuric acid solution.
Answer: The balanced equation is [tex]2KOH + H_{2}SO_{4} \rightarrow K_{2}SO_{4} + 2H_{2}O[/tex] and the concentration of the sulfuric acid solution is 0.184 M.
Explanation:
Given: [tex]V_{1}[/tex] = 27.5 mL, [tex]M_{1}[/tex] = 0.235 M
[tex]V_{2}[/tex] = 35.0 mL, [tex]M_{2}[/tex] = ?
Formula used to calculate the concentration of the sulfuric acid solution is as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]
Substitute the values into above formula as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}\\0.235 M \times 27.5 mL = M_{2} \times 35.0 mL\\M_{2} = \frac{0.235 M \times 27.5 mL}{35.0 mL}\\= 0.184 M[/tex]
The given chemical equation for given reaction is as follows.
[tex]KOH + H_{2}SO_{4} \rightarrow K_{2}SO_{4} + H_{2}O[/tex]
Number of atoms on reactant side are as follows.
K = 1H = 2[tex]SO_{4}[/tex] = 1O = 1Number of atoms on product side are as follows.
K = 2H = 2[tex]SO_{4}[/tex] = 1O = 1To balance this equation, multiply KOH by 2 on reactant side and multiply [tex]H_{2}O[/tex] by 2. Hence, the equation can be rewritten as follows.
[tex]2KOH + H_{2}SO_{4} \rightarrow K_{2}SO_{4} + 2H_{2}O[/tex]
Now, number of atoms on reactant side are as follows.
K = 2H = 4[tex]SO_{4}[/tex] = 1O = 2Number of atoms on product side are as follows.
K = 2H = 4[tex]SO_{4}[/tex] = 1O = 2Since, there are same number of atoms of both reactant and products. Therefore, the equation is now balanced.
Thus, we can conclude that the balanced equation is [tex]2KOH + H_{2}SO_{4} \rightarrow K_{2}SO_{4} + 2H_{2}O[/tex] and the concentration of the sulfuric acid solution is 0.184 M.
In an aqueous chloride solution cobalt(II) exists in equilibrium with the complex ion CoCl42-. Co2 (aq) is pink and CoCl42-(aq) is blue. At Low Temperature the pink color pre-dominates. At High Temperature the blue color is strong. If we represent the equilibrium as:
CoCl4^2-(aq) <--> Co2+(aq) + 4Cl-(aq)
We can conclude that:___.
1. This reaction is:___.
A. Exothermic
B. Endothermic
C. Neutral
2. When the temperature is decreased the equilibrium constant, K:____.
A. Increases
B. Decreases
C. Remains the same.
3. When the temperature is decreased the equilibrium concentration of Co2:______.
A. Increases
B. Decreases
C. Remains the same.
Answer:
1. This reaction is (A) Exothermic .
2. When the temperature is decreased the equilibrium constant, K: (A) Increases
3.When the temperature is decreased the equilibrium concentration of Co2: (A) Increases
Explanation:
[tex]CoCl4^2-(aq) <--> Co_2+(aq) + 4Cl^-(aq)[/tex]
1. The pink color predominates at low temperatures, indicating that the commodity is preferred.
This is a reaction that is exothermic.
2. As the decrease in the temperature , the equilibrium constant , K ;
equilibrium constant = [tex]\frac{product}{reactant}[/tex] =[tex]\frac{[CO^2^+][Cl^-^4]}{CoCl^2^-_4}[/tex]
As the temperature drops, the concentration of[tex]Cl^-[/tex] and [tex]CO^2^+[/tex] rises, and K rises as well , thus it increases .
3. The equilibrium concentration of [tex]CO^2^+[/tex] decreases as the temperature decreases:
When the temperature is lowered, the equilibrium shifts to the right , that is it increases.
A ______ is a hole where the steam looks a lot like a smoke
A DRY ICE is hole were the steam looks a lot a smoke
Why do scientists track virus mutations and how might tracking these variants be helpful in preventing and treating the virus?
Answer: they do this because if they do they can easily find new viruses to stay safe from
Explanation: i took test on it recentley
Burning fossil fuels provides a main source of energy in many parts of the world. Which is a disadvantage of using fossil fuels?
What are the reactants and products of a redox reaction, neutralization reactions, and precipitation reactions?
Answer:
Precipitation reactions are ones in which at least one of the reactants is in the aqueous phase (i.e., dissolved in water), and a solid forms on the product side which was not present on the reactant side. If all the reactants are solid, then a solid product forming should not be called a precipitate. To be called a precipitate, an insoluble product must form from within solution, either from a solid and solute interacting, or from an interaction strictly between solutes.
Explanation:
This equation is not balanced. Click on the coefficient we should change first.
help ASAP
Answer: The coefficient we should change first is for [tex]NO_{3}[/tex].
Explanation:
The given reaction equation is as follows.
[tex]Al + Ni(NO_{3})_{2} \rightarrow Al(NO_{3})_{3} + Ni[/tex]
Here, number of atoms present on reactant side are as follows.
Al = 1Ni = 1[tex]NO_{3}[/tex] = 2Number of atoms present on the product side are as follows.
Al = 1Ni = 1[tex]NO_{3}[/tex] = 3To balance this equation, multiply Al by 2 and [tex]NO_{3}[/tex] by 3 on reactant side. Also, multiply [tex]Al(NO_{3})_{3}[/tex] by 2 and Ni by 3 on the product side.
Hence, the equation can be rewritten as follows.
[tex]2Al + 3Ni(NO_{3})_{2} \rightarrow 2Al(NO_{3})_{3} + 3Ni[/tex]
Now, number of atoms present on reactant side are as follows.
Al = 2Ni = 3[tex]NO_{3}[/tex] = 6Number of atoms present on product side are as follows.
Al = 2Ni = 3[tex]NO_{3}[/tex] = 6Since, the atoms on both reactant and product side are same. Hence, it is now a balanced chemical equation.
Thus, we can conclude that the coefficient we should change first is for [tex]NO_{3}[/tex].
Directions: Decode the words using the clue. The definition of each word is
also given to help you identify the words.
D
F
н
K
X
L
Y
N
P
R
$
V
N
1. ZBYRPHYRF - smallest particle in a chemical element or compound
Anger
Answer:
cause it has more
space between molecules.
O C. Ice has a higher density than li
Explanation:
Steven placed an ice cream scoop under hot water before scooping ice cream. Which describes how the ice cream scoop was affected
Answer: Okay so i don't know how i can explain this but.. OK so Steven placed an ice cream scoop right? and put it under hot water so i would say it would make the ice cream scoop hot? and then using it to scoop the ice cream i could say it would be a melting affection i think
Explanation:
im am so sorry pls forgive me is i am wrong i tried my best so at least give me a like for effort.. i hope u have a great day :)
Someone please help!
Answer:
Warm Springs temperature
Explanation:
Question 8 of 10
Why is it important for scientists to use the scientific method?
A. The scientific method helps scientists get accurate,
repeatable results.
B. Experiments would not produce any data without the
scientific method.
C. Scientists would not ask questions if the scientific
method were not used.
D. Using the scientific method means that the results
will support the hypothesis.
(02.02 LC) The two main types of weathering are Select one:
a. mechanical and physical
b. physical and kinetic
c. chemical and physical
d. chemical and acidic
Answer:
d
Explanation:
Answer:
c. chemical and physical
Explanation:
hope this helps! :)
What is the major function of the cell membrane?
Answer:
The plasma membrane, or the cell membrane, provides protection for a cell. It also provides a fixed environment inside the cell, and that membrane has several different functions. One is to transport nutrients into the cell and also to transport toxic substances out of the cell.
This equation is not balanced. Click on the coefficient we should change first.
help
please
2H2 + O2 = 2H2O is a neutralization or non-neutralization reaction? And explain why..
How many grams are in 2.0 x 10-5 moles of uranium?
If I have 18 liters of gas at a pressure of 88 atm, what will be the final pressure of the gas if the volume of the gas is decreased to 12 liters under constant pressure ? Show calculations.
Answer: You meant in constant temperature?
Because temperature is not mentioned at the beginning.
I suppose temperature remains constant, otherwise
there is no enough data for solving the problem
Explanation: According Boyle´s law in constant temperature
pV = constant. So p1V1 = p2V2 and pressure p2 = p1V1 /V2
= 88 atm · 18 l / 12 l = 132 atm.
If I have 18 liters of gas at a pressure of 88 atm, the final pressure of the gas if the volume of the gas is decreased to 12 liters under constant pressure is 132atm.
HOW TO CALCULATE PRESSURE?The pressure of gas at constant temperature can be calculated using Boyle's law equation as follows:
P1V1 = P2V2
Where;
P1 = initial pressure (88atm)P2 = final pressure (?atm)V1 = initial volume (18L)V2 = final volume (12L)The final pressure of the gas can be calculated as follows:
88 × 18 = 12 × P2
1584 = 12P2
P2 = 1584 ÷ 12
P2 = 132atm
Therefore, have 18 liters of gas at a pressure of 88 atm, the final pressure of the gas if the volume of the gas is decreased to 12 liters under constant pressure is 132atm.
Learn more about Boyle's law at: https://brainly.com/question/1437490
What sort of fossils would be expected to be found in Antarctica from more recent times, after it had moved much closer to the South Pole?
Answer:
Antarctic Peninsula, is one of the most important fossil sites on Earth.
hope this helps you ☺️☺️
Fossils that would be expected to be found in Antarctica from more recent times, after it had moved much closer to the South Pole is Antartica peninsula.
What are fossils?Fossils are the preserved remains, impression, or trace of any once-living thing from many years ago. Examples of the fossils include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants.
There are four different types of fossils-
Mold fossils
Cast fossils
Trace fossils or Ichnofossils
True form fossils
Imprints, tracks, and trails can also become fossilized and are called Trace fossils. Dinosaur footprints or worm burrows are the examples.
Living things when get decomposed from the so many years ago and become dirt and rocks are fossils.
Therefore, Fossils that would be expected to be found in Antarctica from more recent times, after it had moved much closer to the South Pole is Antartica peninsula.
Learn more about Fossils, here:
https://brainly.com/question/14988327
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Question 3 of 20 :
Select the best answer for the question.
3. The atomic number of niobium (Nb) is 41. What's the electron configuration for Nb?
O A. [Ar] 3s 4p?
O B. [Kr] 5s? 5p
O C. [Kr] 4d45s
O D. (Ne) 4d
Answer:
[Kr] 4d4 5s1
Explanation:
Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 electrons in the atomic structure. The chemical symbol for Niobium is Nb. Neutron Number and Mass Number of Niobium Mass numbers of typical isotopes of Niobium are 93.
Name of Element : Niobium
Atomic Weight : 92.9
Atomic Number : 41
Group : Transition Elements
Electron Configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d3