A student mixes a solution of lead (II) nitrate with a solution of potassium iodide and notices the formation of a yellow solid. What is the precipitate? How do you know?
Answer:
Lead (II) iodide
Explanation:
The reaction of lead (II) nitrate, Pb(NO₃)₂ with KI is:
Pb(NO₃)₂(aq) + 2KI(aq) → KNO₃(aq) + PbI₂(s)
This is a typical double-replacement reaction where anions and cations exchange its couple.
All nitrates are solubles, thus, KNO₃ is not the precipitate.
The only possibility of precipitate is PbI₂,
Lead (II) iodide, a yellow and insoluble solid...
Determine the frequency of light with a wavelength of 6.75 x 10 ^7 m
Answer:
4.44 Hz
Explanation:
v = frequency x wavelength = 3 x 10^8 m/s = frequency x 6.75x 10^7 m
frequency , f= [tex]\frac{3*10^8 }{6.75* 10^7}[/tex] =4.44 Hz
Cleaning solutions work faster if it is used straight from bottle rather
than adding water to the solution why?
Answer:
adding water would make the solution less concentrated. Hope this helps :)
Explanation:
The solution would become less concentrated if water was added.
What is solution?A solution is just a uniformly dispersed mixture with one or maybe more solutes in a solvent. solvent.
What is concentrated?
The number of particles existing in a combination is expressed by the concentration of such a chemical substance.
When suitably diluted, this solution will have to be efficient at killing microorganisms. How or when to Sanitize using bleach in a safe way.
To know more about concentration and solution.
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Which sentence would be inappropriate in an informational piece of writing with a formal tone?
A: People find Shakespeare's Pericles, Prince of Tyre boring and annoying because it's possible that he didn't even write the entire play.
B: Thirty-nine plays, a combination of comedies, histories, and tragedies, are attributed to William Shakespeare.
C: William Shakespeare, a poet, and playwright have generally deemed the greatest writer in the history of the English language.
D: Scholars speculate that Hamlet may have been informed by the relationship between Shakespeare and his son Hamnet, who died at eleven years of age.
Answer:
Its a
Explanation:
i took the quiz
The sentence that is inappropriate in an informational piece of writing with a formal tone is "People find Shakespeare's Pericles, Prince of Tyre boring and annoying because it's possible that he didn't even write the entire play." The correct option is A.
What is a formal tone?In academic or professional settings, a formal writing tone is common. This tone emphasizes thoroughness and directness while remaining respectful.
It emphasizes facts and grammatical correctness and uses full words rather than contractions.
The use of standard English, more complex sentence structures, the infrequent use of personal pronouns, and the absence of colloquial or slang terms characterize formal language.
In informal language, nonstandard English forms, colloquial vocabulary, and typically shorter sentence structures are permitted.
"People find Shakespeare's Pericles, Prince of Tyre boring and annoying because it's possible that he didn't even write the entire play," is an inappropriate sentence in a formal informational piece of writing.
Thus, the correct option is A.
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how do we know waves transfer energy
Explanation:
i am sry to lazy to write it
What is physical weathering?
the building up of rock that has been brought from other places
the breaking of rock into smaller pieces from chemical processes
the breaking of rock into smaller pieces from nonchemical processes
the moving of rock from one place to another
Physical weathering is caused by physical processes such as changes in temperature, freezing and thawing, and the effects of wind, rain and waves.
hope this helped
What oxidation half-reaction happens when iron reacts with tin(II) nitrate?
Fe(s) + Sn(NO3)2(aq) → Fe(NO3)2(aq) + Sn(s)
O A. Fe2+ (aq) + 2e → Fe(s)
O B. Sn(s) → Sn2+(aq) + 2e
O C. Fe(s) → Fe2+(aq) + 2e
O D. Sn2+(aq) + 2e → Sn(s)
Answer: Fe(s) —> Fe2+ (aq) + 2e-
Explanation:
If 0.213 moles of argon occupies a volume of 652 mL at a particular temp and pressure, what volume would it occupy if 0.162 moles of argon were added at the same conditions?
Answer:
V₂ = 495.89 mL
Explanation:
Given data:
Initial number of moles = 0.213 mol
Initial volume = 652 mL
Final number of moles = 0.162 mol
Final volume = ?
Solution:
V₁/n₁ = V₂/n₂
By putting values,
652 mL/0.213 mol = V₂ /0.162 mol
V₂ = 652 mL 0.162 mol /0.213 mol
V₂ = 105.62 mL.mol /0.213 mol
V₂ = 495.89 mL
Mixed Naming Worksheet – Ionic, Covalent and Acids
Directions: Be sure to determine what type of compound your substance is – ionic, binary, covalent or an acid. Naming Compounds
1. NO2 - Covalent
2. NaBr - Ionic
3. SiO2 -
4. P2Br4
5. FeSO4
6. SF6
7. HNO3
8. Li2S
9. HCl
10. MgBr2
What is the electrical charge on the nucleus of a carbon-12 atom
Answer:
Neutral carbon-12 (or any carbon atom) has 6 electrons with a total negative charge of 6e- orbiting a nucleus with a total positive charge of 6e+, so that the total net charge is zero. The nucleus is made up of 6 protons, each with a positive charge of e+, and 6 neutrons, each with zero charge.
Explanation:
Answer:
Neutral Carbon-12 Atom
What is Half-Life?
plz help me im fillin out a study guide
Answer:
a game made by valve
Explanation:
its a 10/10 game
What is the oxidation number (charge) of Copper in CuMnO4 ?
ANSWER:
+2
Explanation:
Recognize CuSO 4 as an ionic compound containing a copper ion and a sulfate ion, SO42-. To form an electrically neutral compound, the copper must be present as a Cu2+ ion. The oxidation state is therefore +2.
Microorganisms in the soil decompose waste as a source of energy for growth and release carbon dioxide (CO2). Scientists have observed that as soil temperatures increase (up to 25°C), the amount of CO2 released into the atmosphere from the soil increases. Which explanation about how environmental factors affect the growth of microorganisms is BEST supported by this observation? Group of answer choices An increase in soil temperature decreases microorganism growth because the rate of decomposition decreases. An increase in soil temperature increases microorganism growth because the rate of decomposition increases. An increase in the amount of CO2 in the atmosphere from the soil increases microorganism growth because the rate of decomposition decreases. An increase in the amount of CO2 in the atmosphere from the soil decreases microorganism growth because the rate of decomposition increases.
Answer:
An increase in soil temperature increases microorganism growth because the rate of decomposition increases.
Explanation:
An increase in soil temperature increases microbial activities and the activity of extracellular enzymes that degrade polymeric organic matter within the soil. An increase in the soil microbial activities means that the decomposition rate and microorganism growth would increase. Increase in the activity of extracellular enzymes that degrade polymeric organic matter within the soil also means that more carbon dioxide would be produced and released into the atmosphere.
What is the variable for the equilibrium constant?
Answer:
The constant can be calculated using the ratio of products to reactants when the equation has reached equilibrium. The equilibrium constant is often represented by the variable Keq, which is defined by the equilibrium constant expression
Which of the following can occur after a rock is weathered?
It forms metamorphic rock.
It melts and forms igneous rock.
The sediment can form magma.
It gets compacted and forms sedimentary rock.
Answer:
It gets compacted and forms sedimentary rock.
Explanation:
After a rock is weathered, one thing that can happen is for it to get compacted and form sedimentary rock.
When a rock is weathered, sediments are produced from their erosion. These materials are collected and deposited by agents of denudation. In sedimentary basin, they get compacted, cemented and lithified. The lithified sediment will then form sedimentary rocks.1
2
3
4
6
8
10
Which word equation shows hydrogen reacting with oxygen to form water?
ОООО
oxygen + water → hydrogen
hydrogen + oxygen → water
oxygen + water → hydrogen + water
O hydrogen + water → oxygen
Answer:
hydrogen and oxygen>water
Can someone please answer my last question, ill post more like it for more points :)
Elerium would have 25 protons, 30 neutrons and 24 electrons. What would its mass number be?
Answer:
55
Explanation:
mass number=protons+neutrons
=25+30
=55
Need help fast!!!
_______are organisms that consume other organisms
A) autotrophs
B) heterotrophs
C) producers
D) plants
Answer:
B) heterotrophs
Explanation:
hetero meaning other or different from its own species
Answer:
Answer:
♡ hi fairy ♡
-- the answer is heterotrophs
~ madeline ✧･ﾟ: *✧･ *:･ﾟ✧*
Explanation:
which of the following is not true of hydrogen?
it can form an ion with a +1charge
It can form an ion with a -1 charge.
It is usually found as free hydrogen and not combined with other elements.
It is a colorless, odorless gas.
a. gaining 3 electrons
b. losing 3 electrons
c. gaining 5 electrons
d. losing 5 electrons
Answer: C. Gaining 5 electrons
Explanation: Aluminium has 3 valence electrons to have a full outer shell it would need 5 to become an octet (8).
. A sample of NH₃ gas occupies 57.0 liters at STP. How many molecules of NH₃ is this?
Answer:
15.30 ×10²³ molecules of ammonia
Explanation:
Given data:
Volume of ammonia = 57.0 L
Temperature = standard = 273 K
Pressure = standard = 1 atm
Number of molecules of ammonia = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
1 atm ×57.0 L = n ×0.0821 atm.L/ mol.K × 273 K
57.0 L.atm = n × 22.41 atm.L/ mol
n = 57.0 L.atm/22.41 atm.L/ mol
n = 2.54 mol
Number of molecules of ammonia:
1 mole of gas have 6.022 ×10²³ molecules of ammonia.
2.54 mol ×6.022 ×10²³ molecules / 1 mol
15.30 ×10²³ molecules
What is the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied?
Answer:
A. 0.00420 J/(gi°C)
Explanation:
i got it rigt
The diagram shows what happens when oceanic crust runs into continental crust. What process is being shown in the diagram?
A.
B.
C.
D.
Answer:
B. subduction
Answer:
the contenental crust was b gone beacause of water that fill in the land also the volcano in the under of water will increase
Pls answer this quicklyyy!
Which material has a density most similar to the density of water?
a. Rubber
b. Titanium
c. Ice
d. Egg
e. Granite
f. Titanium
Answer:
c
Explanation:
Please I need help with this homework
PLS ANSWER ITS FOR AN EXAM I DONT HAVE MUCH TIME THANK UUU
Changing a physical property of a sample of matter
A. will not alter its chemical composition if the change is small.
B. will alter its chemical composition if the change is large.
C. always alters its chemical composition.
D. never alters its chemical composition.
Answer:
d. never alters
Explanation:
physical is how it looks, not its chemical makeup... good luck bro :)
Which biome has lost 95-99% of its natural habitat due to farming and ranching?
Grassland biome has lost 95-99% of its natural habitat due to farming and ranching.
What is Grassland biome?
This biome comprises of a lot of open area of grasses and is usually cleared for agricultural activities.
Animals also use it for grazing and ranching purposes which is why it has lost 95-99% of its natural habitat.
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Assignment Summary For this assignment, you will make a scale model—a “core sample”—showing the layers of the Earth: crust, lithosphere, asthenosphere, mantle, outer core, and inner core. Background Information The Earth is composed of six layers with differing thicknesses and properties. The crust forms both land and seafloor. It is thickest under mountains and thinnest under ocean beds. The crust’s thickness ranges from 5 to 70 km thick. The lithosphere consists of the crust plus the upper mantle. It is solid and is about 100 km thick. The asthenosphere is a semisolid layer under the lithosphere. It is about 180 km thick. The lower mantle is 2,250 km thick and is solid, but very hot, rock. The outer core is molten rock and it is 2,266 km thick. Finally, the inner core is 1,210 km thick, and it is solid iron and nickel. Remember that as you go deeper into Earth’s layers, temperature and pressure increase. A core sample is made by drilling into the Earth and pulling out a long cylinder of rock. Geologists analyze these core samples to learn more about Earth’s history and composition. So far, geologists have not yet succeeded in drilling into Earth’s mantle. You will construct a scale model of a core sample. When something is “to scale,” it has a uniform reduction or enlargement. You will calculate how deep each layer should be in centimeters, based on the actual depth of Earth’s layers in kilometers. The percentage of the total for each layer remains the same, but the actual number of units changes.Step 5: Create a typewritten paper describing your model of Earth’s layers. a) Type several paragraphs describing your “core sample” of Earth’s layers in detail. i. Explain what a core sample is. Then, tell whether it is currently possible to take a core sample like the model you’ve created. ii. Compare and contrast the layers in your model, including the significance of the colors. iii. Discuss what it means to create a scale model. iv. Include a table with the values you determined for each layer. v. Discuss the relationships of each layer to the others, including depth. b) Answer the following question in a separate paragraph. i. How does your “core sample” model of Earth’s layers differ from the actual layers of the Earth? c) Make sure your paragraphs include correct sentence structure, punctuation, grammar, and spelling. d) Ask your teacher where you should save your work. Your teacher may also have specific guidelines about the file name you should use.
Answer:
yo I hope this gets you a good grade. I have the same thing due on Nov. 9. did it the same day it was due. good luck. you will need to make the thing yourself.
Explanation:
A core sample is a cylindrical section of a natural substance. Most core samples are made by drilling with special drills into the substance, such as sediments or rock, with a hollow steel tube, called a core drill. The hole made for the core sample is called the "core hole". It is currently not possible to take a core sample like this one.
The difference in these layers is that the farther down you go the hotter and more dense it gets. You need to make the layers different colors so you know which layer is which and, how deep the layer goes.
What it means to make a scale model is to make a model of something and make it a certain amount smaller than the original.(the entire model should be the same amount smaller than the original.)
Starting at the center, Earth has four different layers. They are, from deepest to shallowest, the inner core, the outer core, the mantle and the crust. Except for the crust, no one has ever explored these layers in person. The inner core is a solid metal ball and is extremely dense, it’s made mostly of iron and nickel.the outer core is also made from iron and nickel, just in liquid form. The mantle is Earth’s thickest layer and is made mostly of iron, magnesium and silicon, it is dense, hot and semi-solid (like caramel candy).Earth’s crust is like the shell of a hard-boiled egg. It is extremely thin and cold. The crust is made of relatively light elements, especially silica, aluminum and oxygen.
How does this “core sample” model of Earth’s layers differ from the actual layers of the Earth? Well, this model is much smaller and is Impossible to do in real life. Example, the metal used for making the hollow rods to take these core samples would melt when they get to the mantle much less the inner core.
Which landform represents the boundary between the land and an ocean or a lake?
Group of answer choices
Coastline
Delta
Dune
Glacier
Answer:
coastline
Explanation:
Answer:
coastline
Explanation: