Answer: Bubbles, burning, odor, color change, and rusting.
Explanation: Chemical changes are changes to something that is irreversible.
2. If a student drops a 2.3 g piece of magnesium into a flask of hydrochloric acid, this reaction occurs: Mg + 2HCl MgCl2 + H2
How many liters of hydrogen can be produced at a pressure of 2 atm and a temperature of 298 K?
1.2 L of hydrogen can be produced at a pressure of 2 atm and a temperature of 298 K.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
Step 1: Write the balanced equation
Mg + 2 HCl ⇒ MgCl₂ + H₂
Step 2: Calculate the moles corresponding to 2.3 g of Mg
The molar mass of Mg is 24.31 g/mol.
2.3 g × 1 mol ÷24.31 g = 0.095 mol
Step 3: Calculate the moles of H₂ produced
0.095 mol Mg × 1 mol H₂ ÷ 1 mol Mg = 0.095 mol H₂
Step 4: Calculate the volume occupied by the hydrogen
We will use the ideal gas equation.
P × V = n × R × T
V = n × R × T÷P
V = 0.095 mol × (0.0821 atm.L/mol.K) × 298 K÷2 atm
V = 1.2 L
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if the maximum temperature for a particular day is 20°c and the minimum temperature is 10°c, the daily mean would be:
The daily mean, given the data from the question is 15 °C
Data obtained from the questionMaximum temperature = 20 °CMinimum temperature = 10 °CMean = ?How to determine the daily meanMean = Sumation of data / Number of data
Mean = (20 + 10) / 2
Mean = 30 / 2
Mean = 15 °C
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What is the independent variable for boiling temperature of water as salt is adddd
The independent variable is the different amounts of salt that will be added to the water.
What is a variable?A variable is any characteristic, number, or quantity that can be measured or counted.
The independent variable is the different amounts salt that will be added to the water (what is done by the scientist).
The dependent variable is the boiling temperature of the water (what is being measured).
HYPOTHESIS: If salt is added to water then, the boiling temperature is lowered.
Hence, the independent variable is the different amounts of salt that will be added to the water.
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Which of the following is a double replacement reaction?
K2S + CoCI2 -> 2KCI + CoS
Ca + 2H2O -> Ca (OH)2 + H2
CaO + H2O -> Ca(OH)2
2KCIO3 -> 2KCI + 3O2
The reaction that exemplifies a double replacement reaction is as follows: K2S + CoCI2 -> 2KCI + CoS, which is option 1.
What is a double replacement reaction?A double replacement reaction is a type of reaction in which two elements are substituted in the reacting compounds.
In the reaction given as follows:
K2S + CoCI2 -> 2KCI + CoS
Pottasium replaces cobalt in Cobalt chlorideSulfur replaces chlorine in Cobalt chlorideTherefore, the reaction is a type of double replacement reaction.
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Find the total surface area of the rectangular prism in the figure. A) 174 cm^ 2 B) 522c * m ^ 2; 348c * m ^ 2 D) 432c * m ^ 2
[tex]\huge\textbf{Hey there!}[/tex]
[tex]\huge\textbf{Better understanding of the lesson}[/tex]
[tex]\text{Formula for finding the area of rectangular prism: \boxed{\mathsf{2(wl + hl + hw) = a}}}\\\text{Whereas, \bf l = \underline{length}, w = \underline{width}, h = \underline{height.}, and a = \underline{area}}[/tex]
[tex]\huge\textbf{Now, let's solve for the given equation}[/tex]
[tex]\mathsf{a = 2\times(8\times6 + 9\times6 + 9\times8)}[/tex]
[tex]\mathsf{a = 2\times(48 + 54 + 72)}[/tex]
[tex]\mathsf{a = 2(48) + 2(54) + 2(72)}[/tex]
[tex]\mathsf{a = 96 + 108 + 144}[/tex]
[tex]\mathsf{a = 204 + 144}[/tex]
[tex]\mathsf{a = 348}[/tex]
[tex]\huge\textbf{Therefore, your answer is: \boxed{\mathsf{348\ cm^2}}}\huge\checkmark[/tex]
[tex]\huge\textbf{Good luck on your assignment \& enjoy}\\\huge\textbf{your day!}[/tex]
~[tex]\frak{Amphitrite1040:)}[/tex]
the aria ""batter my heart"" from doctor atomic has musical influences from which era?
The aria ""batter my heart"" from doctor atomic has musical influences from the era of Renaissance.
Why is batter my heart attributed to to Renaissance era?The Renaissance era can be regarded as the era around 14th century and batter my heart was produced around the 13/14th century.
The batter my heart was among the Sicilian school of court poets, that was very famous which emphasizing the importance of the heart.
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An electrolytic cell differs from a voltaic cell because.
Find the ratio of the volume divided by the
temperature for the first data pair. Use significant
figures.
V/T=0.72/276= 0.002 ✓
COMPLETE
Now do the same computation for all six pairs of
values. What is the average of all six fractions V/
T?
From the pair of values given, the ratio of the volume to the temperature for the first data pair is, 0.0026 cm³/K
What is a Ratio?A ratio is a comparison between two quantities showing how much one quantity differs from another.
From the data given, the first data pair is as follows ;
Temperature = 276 KVolume = 0.72 cm³Ratio of volume to temperature = volume / temperature
Ratio = 0.72 / 276
Ratio = 0.002608 cm³/K
The significant figure's rule for division is the least number of significant figures used in the operation.
The least significant figure of the values given is 2.
Therefore, the ratio of the volume to the temperature for the first data pair is 0.0026 cm³/K
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Answer:
0.0026
Explanation:
edge 2022 it's the same answer for both parts
blocks on the periodic table will not list a(n):
Blocks on the periodic table will not list a mass number of elements in this scenario.
What is Periodic table?This table comprises of elements in order of their atomic number which determines their chemical properties.
It contains the atomic number but however doesn't contain the mass number of the elements.
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How many xenon atoms are contained in 2. 36 moles of xenon?.
Answer:
14.212 x 10^23 atoms
Explanation:
Xenon is a noble gas and is MONOTOMIC so
EACH mole is an Avagadro's Number of atoms
2.36 * 6.022 x 10^23 atoms =
What is the chemical formula for acetic acid?
CH3COOH
Explanation:
hope I helped
if you get the answer right mark me as brainlyst
Please help ASAP
Is there any evidence that a reaction has occurred? (One or more answers may be true.)
a. No, there is no change in the solution.
b. Yes, because H2SO4 is being added.
c. Yes, a precipitate formed.
d. Yes, there is a change in conductivity.
3. Why did the solution change from blue to yellow (what chemical reaction happened)?
Answer:
it was more acidic
Explanation:
changing the pH of the solution and making it more acidic results in the color of the solution changing it from blue to yellow
solution is Bromothymol blue
in a ph below 6 it turns yellow because
a ph below 6 is acidic
a ph above 7.6 its blue because
a ph above 7.6 is basic
Bromothymol blue is made in a basic solution, so it starts out as blue, thus the name 'blue'. It changes to yellow in acidic conditions
labxchangeorg
wikipedia
studycom
0.467 mol NaCl are needed to
create a 0.875 m solution using 534
g of water. How many grams of
sodium chloride are required to
make the solution?
Answer:
27.4 gram is the solution it's simple dude...
Explanation:
don't be afraid of huge question they confuse you you need not to be confused
now see simple solution
molality is denoted by m
so
m= moles of solute / mass of solvent in kg.
i hope your know the meaning of solute and solvent....
so moles are given 0.467
and molar mass is given 58.44
so just take out the gram means
by applying formula
58.44×0.467
it will give 27.4 grams simple.....
what will happen when a wax candle burned in air with limited oxygen?
Answer:
The molecules of carbon dioxide are heavier than air. When a result, as they descend over the flame and candle, they push the oxygen and other air molecules out of the path. The oxygen can no longer react with the wax when it is pushed away from the wick. The flame is put out as a result.
Answer:
if the candle is burned in air with limited oxygen supply the candle will go out of fire as the oxygen is reducing....
Explanation:
Hope It Helps!!!
How many moles are present in 6.5 x 1024 atoms of Ba?
10.8 moles are present in 6.5 × 10²⁴ atoms of Barium (Ba). Details on how to calculate number of moles can be found below.
How to calculate number of moles?The number of moles of a substance can be calculated by dividing the number of atoms in the substance by Avogadro's number.
According to this question, 6.5 × 10²⁴ atoms of Ba are present, the number of moles is calculated thus:
no of moles = 6.5 × 10²⁴ ÷ 6.02 × 10²³
no of moles = 1.08 × 10¹
no of moles = 10.8moles
Therefore, 10.8 moles are present in 6.5 × 10²⁴ atoms of Barium (Ba).
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Help!!!!!!!!!!!!!!!!
Answer:
the mixture two is the Heterogeneous solution and the mixture 1 (sugar solution) is true solution
Explanation:
Heterogeneous solutions are solutions with non-uniform composition and properties throughout the solution. A solution of oil and water, water and chalk powder and solution of water and sand, etc.
True solution
The sugar solution is a mixture of sugar and water which is a true solution. True Solution is a homogeneous mixture of two or more materials with a particle size of less than 10-9 m or 1 nm dissolved in the solvent.
A solute is a substance to be dissolved.
The solvent is the one in which solute is dissolving.
In the sugar solution sugar is the solute and water is the solvent.
Answer:
Explanation:
your cool
Please answer one question. thanks so much if u do
What is the substance produced by a chemical reaction called?
a) Reactant
b) Product
c) Resultant
d) Reagent
e) Summation
What kind of chemical reaction involves oxygen and another substance producing water and carbon dioxide?
a) Synthesis reaction
b) Decomposition reaction
c) Combustion
d) Single displacement
e) Photochemical reaction
What does a catalyst do to a chemical reaction?
a) Stops the reaction
b) Starts the reaction
c) Speeds up the rate of reaction
d) Slows down the rate of reaction
e) None of the Above
Answer:
b) Product
c) Combustion
c) speeds up the rate of reaction
Explanation:
the substance produced by a chemical reaction is called a product (b)
Combustion (c) reactions are involving oxygen and "another substance" [and hydrocarbons] to produce carbon dioxide and water.
A catalyst acts to speed up the rate of a reaction (c)
> note how it "speeds up" reaction: , it [a catalyst] lowers the pressure or temperature needed to start one--but it isn't used/consumed in the reaction
So, the answers are: b, c, c
hope this helps!!
what is the sum of the mass of each kind of atoms of elements in the formula of the compound?
The formula mass of a substance is the sum of the average atomic masses of each atom represented in the chemical formula and is expressed in atomic mass units. The formula mass of a covalent compound is also called the molecular mass.
as a nail approaches the south pole of a magnet, what happens to its magnetic domains?
A. The north poles of the domains point toward the magnet.
B. The south poles of the domains point toward the magnet.
C. The domains spin, but end up in no particular pattern.
D. The domain remain unaffected by the magnet.
The domain remain unaffected by the magnet is the right answer.
What happens to its magnetic domains?Both the north poles and the south poles of the domains point toward the magnet so the domains is unaffected by the magnet as the nail approaches to the south pole of a magnet.
So we can conclude that the domain remain unaffected by the magnet is the right answer.
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Answer. The domain remain unaffected by the magnet
How many moles of h+ ions are present in 2.8 l of 0.25 m hydrobromic acid solution?
0.7 mol of H⁺ ions are present in 2.8 l of 0.25 m hydrobromic acid solution.
Hydrobromic acid is a strong acid, we can assume that all acid molecules dissociate completely to yield H+ ions and dissociated anion.
The equation for the dissociation of HBr :Hbr (s) → H⁺ (aq) + Br⁻ (aq)
moles H⁺ = ([tex]2800ml[/tex]) ( [tex]\frac{1L}{1000ML}[/tex]) ([tex]\frac{0.25 mol Hbr}{L}[/tex]) ( [tex]\frac{1 mol H}{1 mol Hbr}[/tex])
= 0.7 mol
Therefore, 0.7 mol of H⁺ ions is present.
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What is the wavelength of an electromagnetic wave that has a frequency of 7.80 * 10 ^ 14 Hz in a vacuum? (The speed of light in a vacuum is 3.00 * 10 ^ 8 m/s.)
A. 1.22 * 10 ^ - 15 * m
B. 3.85 * 10 ^ - 7 * m
C. 2.34 * 10 ^ 23 * m
D. 2.60 * 10 ^ 6 * m
Answer:
B.) 3.85 x 10⁻⁷ m
Explanation:
To find the wavelength, you can use the following formula:
wavelength = speed of light / frequency
Since you have been given both the speed of light and frequency, you can plug these values into the equation to find wavelength.
wavelength = speed of light / frequency
wavelength = (3.00 x 10⁸ m/s) / (7.80 x 10¹⁴ Hz)
wavelength = 3.85 x 10⁻⁷ m
Explain one way in which facilitated diffusion is the same as simple diffusion.
Answer:
they both transport molecules along or down the concentration gradient of the solute and tdo not require energy from an outside source.
How many liters of a 0.80 M
solution can be made with 2.0 mol
KNO3?
Answer: 2.5
Explanation: you devide mol solute which is 2.0 and the L solution which is 0.80M, and after you divide the two you get 2.5
i also had this question <3
The molarity is an important method to calculate the concentration of a solution. The volume of potassium nitrate of 0.80 molarity and 2.0 mol moles is 2.5 L.
What is molarity?The molarity of a solution is defined as the number of moles of the solute present per litre of the solution. It is mainly employed in calculating the molarity of a binary solution. It is represented as 'M' and unit is mol L⁻¹.
The equation used to calculate the molarity is given as:
Molarity = Number of moles of the solute / Volume of the solution in litres
Here molarity = 0.80 M
Number of moles = 2.0 mol
Then the volume of the solution = Number of moles of the solute / Molarity
Volume = 2.0 / 0.80 = 2.5 L
Thus the volume of the solution is 2.5 L.
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What are distilled chemicals used for and what are the environmental impacts?
Answer:
Cryogenic distillation is the commercially viable separation; however, it consumes over 20 Gigajoules of energy for every ton of ethylene produced. This energy consumption is associated with significant greenhouse gas emission and depletion of non-renewable energy resources
Explanation:
hope it's helpful to you
10.00 g of LiCl is dissolved in water to make 1.00 L of "Solution A". Then, 100 mL
of solution A were diluted to a volume of 500 mL of "Solution B". What is the
molarity of solution B? (Report your answer to four places past the decimal point.
Moodle is looking for a number only, no units.)
0.47 M is the molarity of solution B if 10.00 g of LiCl is dissolved in water to make 1.00 L of "Solution A".
Define the molarity of a solution.Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.
[tex]Molality = \frac{Moles \;solute}{Solvent \;in \;kg}[/tex]
Moles of LiCl
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
[tex]Moles = \frac{10.00 g}{42.394 g/mol}[/tex]
Moles = 0.2358824362
[tex]Molality = \frac{0.2358824362}{0.5 L}[/tex]
Molarity = 0.4717648724 M =0.47 M
Hence, 0.47 M is the molarity of solution B.
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54.0 g Al reacts with 64.0 g O2 to
form Al2O3 according to the equation.
4A1+30₂ → 2Al2O3
Al: 26.98 g/mol Al2O3: 101.96 g/mol
How many grams of Al2O3 form
from 54.0 g Al?
[?] g Al₂O3
Answer:
102 g Al₂O₃
Explanation:
To find the mass of Al₂O₃, you need to (1) convert grams Al to moles Al (via molar mass), then (2) convert moles Al to moles Al₂O₃ (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles Al₂O₃ to grams Al₂O₃ (via molar mass). It is important to arrange the ratios in a way that allows for the cancellation of units. The final answer should have 3 sig figs to reflect the given values.
Molar Mass (Al): 26.98 g/mol
Molar Mass (Al₂O₃): 101.96 g/mol
4 Al + 3 O₂ ---> 2 Al₂O₃
54.0 g Al 1 mole 2 moles Al₂O₃ 101.96 g
-------------- x ----------------- x ----------------------- x ---------------- = 102 g Al₂O₃
26.98 g 4 moles Al 1 mole
Answer: 102 for 54.0 and 136 for 64.0
Explanation:
□ 4. In a closed container, the temperature is increased by 50%. Which of the following will happen to the gas inside the container?
O It will remain unchanged.
The molecules will move more slowly.
The molecules will exert less pressure on the container walls
O The molecules will move more quickly.
Answer: The molecules will move more quickly.
Explanation:
As temperature increases, the kinetic energy of the particles increases, causing them to move more quickly.
work out the size of resistance.
Answer:
Step 1: Identify the resistivity (ρ) , length (L), and radius (r) of the wire. Step 2: Calculate the cross-sectional area of the wire using the formula for the area of a circle: A=πr2 A = π r 2 . Step 3: Calculate the resistance (R) of the wire using the formula for resistance: R=ρLA R = ρ L A
Which of the following best describes a mixture? A. A substance that results when another substance is separated into its component parts B. A substance composed of two or more elements chemically combined C. A substance that results when two or more substances combine physically but not chemically D. A particle consisting of two or more atoms chemically combined
Answer: C. A substance that results when two or more substances combine physically but not chemically
