Answer:
When aluminum is placed in an acid it may initially appear not react. This is because a layer of aluminum oxide form on the surface of the aluminum due to prior reaction with the air and acts as a protective barrier ....Aluminum react with dilute acid to give aluminum chloride and hydrogen gas..
You have a 0.7 M solution. Your job is to produce 50 mL of a 0.4 M solution.
A. How much of the 0.7 M solution do you need to start with? (Show your work.)
B. How many moles of solute were in the 0.7 M solution? (Show your work.)
C. How much water do you need to add to the previous amount of the 0.7 M solution to dilute it to
0.4 M? (Show your work.)
D. A student decides to put double the amount of water calculated in Part C. Describe what effect this
will have on the overall concentration of the resulting solution. Justify your answer.
Answer: A. 28.6 ml of the 0.7 M solution we need to start with.
B. There are 0.02 moles of solute were in the 0.7 M solution.
C. Amount of water to be added is 21.4 ml
D. The resulting solution will have concentration of 0.28 M
Explanation:
According to the dilution law,
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = molarity of stock solution = 0.7 M
[tex]V_1[/tex] = volume of stock solution = ?
[tex]M_1[/tex] = molarity of diluted solution = 0.4 M
[tex]V_1[/tex] = volume of diluted solution = 50 ml
Putting in the values we get:
[tex]0.7\times V_1=0.4\times 50[/tex]
[tex]V_1=28.6ml[/tex]
A. 28.6 ml of the 0.7 M solution we need to start with.
B. Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n = moles of solute
[tex]V_s[/tex] = volume of solution in ml
[tex]0.7=\frac{n\times 1000}{28.6}[/tex]
[tex]n=0.02[/tex]
Thus there are 0.02 moles of solute were in the 0.7 M solution.
C. Amount of water to be added = (50-28.6 ) ml = 21.4 ml
D. If water added is [tex]2\times 21.4=42.8 ml[/tex]
[tex]0.7\times 28.6=M_2\times 71.4[/tex]
[tex]M_2=0.28M[/tex]
If volume of concentrated solution will be more , the resulting solution will have lesser concentration of 0.28 M
When I cut it a gas will irritate my eye. Sometimes when I'm cooking you might see me cry.
Answer:
Explanation:
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ONION
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IF MY ANSWER IS CORRECT THEN MARK ME AS BRAINLIST
Which of the following is a scientific question? O A. How can I make a peach cobbler? O B. What chemicals cause most plants to be green? C. What is the best color for my room? O D. Do black dogs make better pets than brown dogs?
Which pair of elements are in the same period on the periodic table?
А
Lithium & Sodium
B
Hydrogen & Potassium
C
Boron & Silicon
D
Sulfur & Argon
which of the following is an example of a longitudinal wave
Answer:
Examples of longitudinal waves include: sound waves. ultrasound waves. seismic P-waves.
Explanation:
Look carefully at the list of objects and order them from smallest to largest.
• ant
• atom
• cell
• dust particle
ping pong ball
.
Answer:
atom
cell
dust particle
ant
ping pong ball
Explanation:
:) hope this helps! :)
What is the molar mass of Sn(CO3)2?
Answer:
The molar mass and molecular weight of Sn(CO3)2 is 238.728.
Explanation:
Molar mass of any molecule can be calculated by adding mass of all individual atoms that comprises the compound. The Molar mass of [tex]Sn(CO_{3})_{2}[/tex] is 238.72g/mol.
What is molar mass?Molar mass is defined as mass of one mole of a molecule or compound. It's SI unit is g/mole. The other term that is used for molar mass is molecular weight, formula unit mass. Molar mass is extensive property as it depends on the mass of individual atoms that constitutes the molecule.
Mass of tin= 118.71 g.mol
Mass of Carbon=12g/mol
mass of Oxygen= 16g/mole
Molar mass of [tex]Sn(CO_{3})_{2}[/tex] = 1×mass of tin+2×mass of carbon+6×mass of oxygen
substituting all the values we get
Molar mass of [tex]Sn(CO_{3})_{2}[/tex] = 1×118.71+2×12g/mol+6× 16g/mole
Molar mass of [tex]Sn(CO_{3})_{2}[/tex] =118.71 +24+66
Molar mass of [tex]Sn(CO_{3})_{2}[/tex]=238.72g/mol
Therefore the Molar mass of [tex]Sn(CO_{3})_{2}[/tex] is 238.72g/mol
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The most familiar elements are typically the most elements
Answer:
The most familiar elements are the elements found in nature, such as sodium, carbon, oxygen, ect...
Explanation:
Scientist use alternative ways to seek out if a fault is active which one isn't include
Answer:
Geologists commonly consider faults to be active if there has been movement observed or evidence of seismic activity during the last 10,000 years. Active faulting is considered to be a geologic hazard - one related to earthquakes as a cause.
Explanation:
Plz mark brainliest thanks
A rectangle has a volume of 395cm3. It has a mass of 147g. What is its density? *
The density of a rectangle : ρ = 0.372 g/cm³
Further explanationGiven
The volume of rectangle : 395 cm³
Mass : 147 g
Required
The density
Solution
Density is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
Input the value :
ρ = 147 g : 395 cm³
ρ = 0.372 g/cm³
Can someone please help me !!
5 meters= 0.005
3 grams= 300millgrams
7 meters= 700 cm
60 milligrams=6e-5
2.5 meters=2500
4.5 centimeter= 4.5e-5km
How can mixtures best be described?
Answer:
things that are mixed together
1. We sometimes use words differently in a
science setting than we do in our daily lives.
Examples of this are force, work, and energy.
(a) Use a dictionary to explain the difference
between how each of these words is used
in daily conversation and how each is
used in science and technology. You may
also want to go to the Internet for help.
Go to Nelson Science o to Nelson Science
(b) Do these differences in meaning make
it easier or harder to learn science and
technology? Explain.
(c) Are the words mass and weight part of this
same problem? Explain. How should the
terms be used?
Answer:
work can be the operation or function of something but it can also be the energy transfer that occurs when an object is moved or in everyday life it means to do something (specific thing). I don't know all of them by the way.
Explanation:
the differences in meaning sometimes makes it easier and sometimes makes it harder to learn science and technology. sometimes the everyday meaning might somehow be related to the science meaning which helps you grasp everything better while sometimes the meaning is so far fetched it makes it harder to know what you are learning. hope this helps
What is the process of separating liquids by boiling points?
Answer:
Fractional distillation (often shortened in high school to just distillation)
Explanation:
Some elements have different boiling points and can be separated by boiling one element out and condensing it. This is how sodium acetate is made, for example.
Hope this helped!
K,Cro, + Pb(NO), - PbCro, * 2KNO,
If 25.0 grams of K,Cro, reacts to produce 20 grams of PbCroy, what is the
percent yield of PbCro?
Answer:
Percent yield = 47.6 %
Explanation:
Given data:
Mass of K₂CrO₄ react = 25.0 g
Mass of PbCrO₄ produced = 20 g
Percent yield of PbCrO₄ = ?
Solution:
Chemical equation:
K₂CrO₄ + Pb(NO₃)₂ → PbCrO₄ + 2KNO₃
Number of moles of K₂CrO₄:
Number of moles = mass/molar mass
Number of moles = 25.0 g/ 194.19 g/mol
Number of moles = 0.13 mol
Now we will compare the moles of K₂CrO₄ and PbCrO₄ .
K₂CrO₄ : PbCrO₄
1 : 1
0.13 : 0.13
Mass of PbCrO₄: Theoretical yield
Mass = number of moles × molar mass
Mass = 0.13 mol × 323.2 g/mol
Mass = 42.0 g
Percent yield:
Percent yield = ( actual yield / theoretical yield )× 100
Percent yield = (20 g/ 42.0 g ) × 100
Percent yield = 47.6 %
Is oatmeal cookie an element compound or mixture
Answer:
oatmeal with raisins is a heterogeneous mixture. The raisins may be solid, but turn the bowl over and you will see the mixture as a whole most definitely acts like a liquid. Mud puddles are a heterogeneous mixture.
Explanation:
Answer:
An oatmeal cookie is a heterogeneous mixture, which contains multiple distinct components
How does light energy move from one place to another?
Answer:
yes light can move from a large space to another at a speed of 186,400 miles (300,000 km) per second.
Explanation:
lights does not need any material to carry its energy along which means I can move really fast
Answer:
yes light can move from a large space to another at a speed of 186,400 miles (300,000 km) per second.
Explanation:
lights does not need any material to carry its energy along which means I can move really fast
Explanation:that should help uuu
An atom contains 8 protons, 8 neutrons and 10 electrons. A second atom
contains 9 protons, 10 neutrons and 10 electrons. What can be said about
these two atoms?
A. Both atoms are neutral
B. The atoms are isotopes of each other
C. Both atoms are ions
D. these atoms cannot exist in nature
Answer:
both atoms are ions
Explanation:
what’s the answer to this question pls help
Solving and balancing chemical equations
6. Would you describe each of these temperatures as warm, hot, or cold?
b. 60 °C
a. 100 K
c. 250 K
d. 25 °C
e.
300 K
f. -100 °C
g. 400 K
Answer:
b: Hot
a: Cold
c: Cold
d: Warm
e: Warm
f: Cold
g: Hot
Explanation:
:)
how can you describe energy? ( make it understandable )
Question: What is a mole ratio and why is it
useful?
will give the brainliest to the best answer
Answer: A mole ratio is a conversion factor that relates the amounts in moles of any two substances in a chemical reaction. The numbers in a conversion factor come from the coefficients of the balanced chemical equation
HOPE THIS HELPS
How are chemical reactions used in art
Answer:
Chemistry reactions are used in art for the following processes;
1) Analog photography
The photographic paper used in analog photography react when exposed to light such that the image on the film stains the photopaper
A series of chemicals are further used to develop the images now carried on the paper and water is used to rinse of the chemicals after the other chemical processes are complete
The photopaper, now bearing the developed photo is hung for it to be dried
2) Paint used for painting consists of several chemicals, including, minerals that serve as pigment, oils that serve as carrying agent, a thinner to prevent the paint from turning to solid
An artist therefore combines different chemicals for a given paint task
3) In the sculpting process
An original sculpture is produced by the artist with the aid of clay or plaster, from the original sculpture, on which wax coatings and chemicals are used to make a replica mold.
Copies of the sculpture can then be made by pouring material into the mold
Explanation:
Twenty students ride a school bus that has a mass of 2500 kg and moves with a speed of 4.25 m/s. the driver has a mass of 75.0 kg. (a) What is the magnitude of the momentum of the bus and its passengers if the average mass of each student is 125 kg? (b) If eight students get off from the bus, what must be the speed of the bus to maintain its original momentum?
please heelpp im begging youu...T^T
Answer:
The new velocity would have to be 5.29 m/s.
Explanation:
2500 kg (bus) + 75 kg (driver) + 2500 kg (students) = 5075 kg
Substituting into the formula:
P = 4.25 m/s x 5075 kg
P= 21,568.75 kg m/s
As I mentioned, since there are two factors that determine momentum, we can still have the same momentum if we change the numbers around. If we subtract eight of the twenty students, the mass would change by 1000 kg.
8 x 125 kg = 1000 kg
Subtract 1000 kg from the initial mass, 5075 kg, and you get 4075 kg.
To maintain the same number on momentum, we would have to increase the number for velocity. We could find that value by doing the following:
21,568.75 kg m/s = (v) (4075 kg)
Divide both sides by 4075 kg, and we discover what the new velocity would have to be:
21,568 kg m/s /4075 kg = (v) (4075 kg) /4075 kg
5.29 m/s = (v)
Can you seperate Oxygen molecules from Hydrogen in water?
does anyone have the 2020 paper for chemistry
Answer:
Erm.......... can you clarify what "paper", you just said "paper" there's a lot.
Explanation:
How many grams are equal to 413 kg in scientific notation
Answer:
[tex]4.13[/tex] x [tex]10^{2}[/tex] = 413 kg
Explanation:
4.13 x 10 = 41.3 then we multiply 41.3 by 10 agian = 41.3 x 10 = 413
so, we multiplied ten two times that = [tex]10^{2}[/tex]
= 4.13 x [tex]10^{2}[/tex]= 413 kg
Given that 1 kilogram = 1000grams, the value of 413 kilograms in grams, using scientific notation is 4.13 × 10⁵g.
How many grams are equal to 413 kg in scientific notation?Note that;
1 kilogram = 1000grams
Given that;
Mass in kilograms = 413kgMass in grams = ?Since, 1 kilogram = 1000grams
413 kilograms = ( 413 × 1000 )grams
413 kilograms = ( 413000 )grams
413 kilograms = 4.13 × 10⁵ g
Given that 1 kilogram = 1000grams, the value of 413 kilograms in grams, using scientific notation is 4.13 × 10⁵g.
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What family contains the most
reactive nonmetals: halogen or alkali?
How are subduction zones related to megathrust earthquakes
Answer:
Subduction zone megathrust faults host Earth’s largest earthquakes, along with multitudes of smaller events that contribute to plate convergence. An understanding of the faulting behavior of megathrusts is central to seismic and tsunami hazard assessment around subduction zone margins. Cumulative sliding displacement across each megathrust, which extends from the trench to the downdip transition to interplate ductile deformation, is accommodated by a combination of rapid stick-slip earthquakes, episodic slow-slip events, and quasi-static creep. Megathrust faults have heterogeneous frictional properties that contribute to earthquake diversity, which is considered here in terms of regional variations in maximum recorded magnitudes, Gutenberg-Richter b values, earthquake productivity, and cumulative seismic moment depth distributions for the major subduction zones. Great earthquakes on megathrusts occur in irregular cycles of interseismic strain accumulation, foreshock activity, main-shock rupture, postseismic slip, viscoelastic relaxation, and fault healing, with all stages now being captured by geophysical monitoring. Observations of depth-dependent radiation characteristics, large earthquake slip distributions, variations in rupture velocities, radiated energy and stress drop, and relationships to aftershock distributions and afterslip are discussed. Seismic sequences for very large events have some degree of regularity within subduction zone segments, but this can be complicated by supercycles of intermittent huge ruptures that traverse segment boundaries. Factors influencing variability of large megathrust ruptures, such as large-scale plate structure and kinematics, presence of sediments and fluids, lower-plate bathymetric roughness, and upper-plate structure, are discussed. The diversity of megathrust failure processes presents a suite of natural hazards, including earthquake shaking, submarine slumping, and tsunami generation. Improved monitoring of the offshore environment is needed to better quantify and mitigate the threats posed by megathrust earthquakes globally.
Explanation:
