13. Which are the simplest pure substances that cannot be broken down into any other substances?
Answers
Answer:
Elements
Explanation:
Each kind of atom is an element. Elements are pure substances that cannot be broken down into simpler substances by ordinary chemical means.
Answer:
Elements
Explanation:
Elements such as those on the periodic table are unable to be broken down into simpler forms.
Mixtures (both homogenous and heterogenous) are made of multiple elements making it able to be physically broken down back to its original elements.
Compounds are also made up of multiple elements, however it must go through a chemical separation process in order for it to be broken down into its original elements.
Matter is a broad term of any substance. So it could both be a combination or a single element making it incorrect for this question.
Related Questions
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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
Answers
Answer:
hydrogen and oxygen>water
What is the electrical charge on the nucleus of a carbon-12 atom
Answers
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 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?
Answers
Answer:
A. 0.00420 J/(gi°C)
Explanation:
i got it rigt
a. gaining 3 electrons
b. losing 3 electrons
c. gaining 5 electrons
d. losing 5 electrons
Answers
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).
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.
Answers
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.What is Half-Life?
plz help me im fillin out a study guide
Answers
Answer:
a game made by valve
Explanation:
its a 10/10 game
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.
Answers
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 is an example of a chemical change?
A.
freezing water
B.
boiling water
C.
baking a cake
D.
felling a tree
E.
breaking a glass pane
Answers
Answer:
D
Explanation:
Which landform represents the boundary between the land and an ocean or a lake?
Group of answer choices
Coastline
Delta
Dune
Glacier
Answers
Answer:
coastline
Explanation:
Answer:
coastline
Explanation:
Need help fast!!!
_______are organisms that consume other organisms
A) autotrophs
B) heterotrophs
C) producers
D) plants
Answers
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:
Determine the pressure exerted by 0.352 mol of oxygen gas in a 1.75 L container at room temperature (25 degrees Celsius). Show all your work!
Answers
Answer:
P = 4.92 atm
Explanation:
Given data:
Number of mole of oxygen = 0.352 mol
Volume of gas = 1.75 L
Temperature = 25°C
Pressure exerted by gas = ?
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
Now we will convert the temperature.
25+273 = 298 K
P × 1.75 L = 0.352 mol × 0.0821 atm.L/ mol.K ×298 K
P = 8.61 atm.L / 1.75 L
P = 4.92 atm
Please I need help with this homework
Answers
how do we know waves transfer energy
Answers
Explanation:
i am sry to lazy to write it
Which biome has lost 95-99% of its natural habitat due to farming and ranching?
Answers
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.
Read more about Grassland biome here https://brainly.com/question/12604224
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The diagram shows what happens when oceanic crust runs into continental crust. What process is being shown in the diagram?
A.
B.
C.
D.
Answers
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
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?
Answers
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...
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
Answers
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
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
Answers
Answer:
c
Explanation:
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.
Answers
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.
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
Answers
4. Phosphorus Tetrabromide
5. Iron(II) sulfate
6. Sulfur hexafluoride
7. Nitric acid
8. Lithium sulfide
9. Hydrogen chloride
10. Magnesium bromide
I think that’s what it is,sorry if I’m wrong.
What is the oxidation number (charge) of Copper in CuMnO4 ?
Answers
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.
Can someone please answer my last question, ill post more like it for more points :)
Answers
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.
Answers
Cleaning solutions work faster if it is used straight from bottle rather
than adding water to the solution why?
Answers
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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GIIVNG BRAINLYY!!!! Universal indicator is an acid/base indicator that can be added to a solution to determine its pH. Universal indicator turns solutions different colors based on its pH. A student adds universal indicator to a solution, and the solution turns the color shown below. The solution must be what? view the attachment
Answers
Answer:
When universal indicator is added to a solution, the color change can indicate the approximate pH of the solution. Acids cause universal indicator solution to change from green toward red. Bases cause universal indicator to change from green toward purple.
Explanation:
The universal indicator turns the solution in red color then the solution must be strongly acidic. Therefore, option (B) is correct.
What is a universal indicator?A universal indicator can be described as a pH indicator made of a solution of various compounds that exhibits many smooth color changes over a wide range of pH values to indicate the acidity or basicity of the solution.
The chemical indicator is a substance that indicates the color change, or the presence/ absence of a threshold amount of a chemical species, such as an acid or base in a solution.
There are many kinds of indicators such as Universal indicator, methyl orange, litmus, phenolphthalein, and bromothymol blue. They are utilized to tell the acidity and basicity of the solution by color change.
In an acidic medium, the universal indicator will show colors such as red, orange, yellow, orangish-yellow, etc. In the basic medium, the universal indicator will change its color to blue-violet or purple. In a neutral medium, it will show green color.
Therefore, the given color is red so the solution is strongly acidic as it has a very low pH value.
Learn more about the universal indicator, here:
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Determine the frequency of light with a wavelength of 6.75 x 10 ^7 m
Answers
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
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.
Answers
Answer:
d. never alters
Explanation:
physical is how it looks, not its chemical makeup... good luck bro :)
which phrase best describes a scientist? a. a person who is highly educated b. a person who learns about the world by observing it. c.a person who understands how the world behaves. d. a person who is extremely knowledgeable about the world
Answers
Answer:
B
Explanation:
None of the other responses doesn't seem right. A is to broad someone can be a scientist and might not be highly educated. C not every scientist studies this field so no. Same goes for D
Answer:
B
Explanation:
. A sample of NH₃ gas occupies 57.0 liters at STP. How many molecules of NH₃ is this?
Answers
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 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)
Answers
Answer: Fe(s) —> Fe2+ (aq) + 2e-
Explanation: