Answer:
lol you have an aot profile pic
When a 0.4500 g sample of impure potassium chloride was dissolved in water and treated with an excess ofsilver nitrate, 0.8402 g of silver chloride was precipitated. Calculate the percentage KCl in the original sample.
Answer:
97.78% KCl in the original sample
Explanation:
The % of KCl in the original sample would be as follows:
[tex]97.78[/tex]%
Given that,
Amount of sample of impure Potassium Chloride [tex]= 0.4500 g[/tex]
Amount of Silver Nitrate precipitated [tex]= 0.8402g[/tex]
Now,
Molarity of KCl = [tex]74.5 g/mol[/tex]
Minimum moles required for reaction [tex]= 0.0059 mol[/tex]
Final number of moles [tex]= 0.0059 mol[/tex]
So,
Concentration = Number of moles * Molarity
[tex]= 0.0059 mol * 0.74.5 g/mol\\= 0.440g[/tex]
Therefore,
% of KCl in the original Sample = Weight of Pure KCl/Weight of Impure KCl
[tex]= 0.440/0.450[/tex] × [tex]100[/tex]
[tex]= 97.78[/tex]%
Thus, [tex]97.78[/tex]% is the correct answer.
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explain how you would obtain pure water from tap water.Your answer must include reference to the principles involved under the topic separating mixture
Answer:
Simple distillation
Where in your cells does cellular respiration occur?
Mitochondria
cytoplasm
nucleus
golgi bodies
Answer:
Mitochondria
Explanation:
The enzymatic reactions of the cellular respiration begin in the cytoplasm, but most of the reactions occur in the mitochondria.
Answer:
Cellular respiration is the multi-step process that creates energy from nutrients and food molecules. It begins in the cytoplasm of the cell, with the mitochondria functioning as the main organelle where the rest of the process continues and finishes. During respiration, glycolysis occurs in the cytoplasm of the cell.
Explanation:
Why are ocean currents important to coastal regions?
Answer:
Warm and cold ocean currents can affect the climate of an area along the coast if the winds blow in from the ocean. Warm ocean currents heat the air above the water and carry the warm air to the land, increasing the temperature of the coastal region.
Explanation:
Ocean currents are important to coastal regions for a number of reasons.
What are the importance?Distribute heat. Ocean currents distribute heat around the globe, which helps to moderate the climate in coastal regions. For example, the Gulf Stream brings warm water from the Gulf of Mexico to the coasts of Europe, which helps to keep Europe's climate warmer than it would be otherwise.
Transport nutrients. Ocean currents transport nutrients from the ocean's depths to the surface, which supports marine life. For example, the California Current brings nutrients from the deep ocean to the surface, which supports a rich marine ecosystem off the coast of California.
Diversify marine life. Ocean currents help to diversify marine life by transporting different species to different parts of the ocean. For example, the Kuroshio Current brings warm water from the western Pacific Ocean to the eastern Pacific Ocean, which has helped to diversify the marine life in this region.
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Which of the following is the best hypothesis?
O A. Why does salt water boil at a higher temperature than
pure water?
O B. Americans use too much salt when they cook.
O C. If I add salt to water, it will cause the boiling point to increase.
D. It's better to cook pasta in salt water than in pure water.
13 Apply Place a check mark in the box to indicate
which type of mutation is being shown.
Original sequence
deletion insertion substitution
deletion insertion substitution
deletion insertion substitution
Answer:
A. ✔️Substitution
B. ✔️Insertion
C. ✔️Deletion
Explanation:
In A, the type of mutation that is shown is Substitution. In B, the type of mutation shown is Insertion and in C, the type of mutation shown is Deletion.
Mutation refers to the change in the DNA sequence. This occurs in an organism. In gene mutation, the structure of DNA molecule changes and produces a different allele of a gene. While in chromosome mutation, there is the change in the structure or number of the whole chromosomes in a particular cell.
Actually, mutations can take place both in prokaryotic cell and in eukaryotic cell.
In genetics, there are: Substitution, Insertion and Deletion mutations.
Substitution mutation is an exchange of one base for another. Insertion mutation is simply addition of one or more nucleotide pairs in a DNA sequence while Deletion mutation refers to the situation in which a sequence of DNA is left out when there is DNA replication.
Answer:
A. Substitution
B. Insertion
C. Deletion
Explanation:
A. There is a replacement in C G there is A T.
B. There is one more base.
C. There are 8 base there should be 9.
______elements that have a longer half-life are more _______ than those that have a shorter half-life.
Answer:
Radioactive elements
Stable
Explanation:
Radioactive elements that have a longer half-life are more stable than those that a shorter half-life.
Half-life is the time taken for half of a radioactive element to decay by half of its original composition.
Now, if a substance have a long half-life, it is more stable and takes time to break down. For atoms with a short life, they are highly unstable and breaks down readily and easily.
(02.01 LC)
Which landform represents a large area of thick ice that moves slowly?
Answer:
Glacier
Explanation:
Which of the following best describes a vacuum?
Hot
Cold
Shiny
Empty
Answer:
hot
Explanation:
Answer:
The Answer is (Empty)
. Which of the following statement is FALSE about gas particles? a. Gases expand to fill their container. b. Gases increase in movement when temperature increases Gases are in constant rapid motion. d. Gas particles are packed tightly together. please hurry
Answer:
D
Explanation:
Match the term (exothermic) with the correct definition.
energy goes into the chemical and cool downs the surrounding area.
energy leaves the chemical and cools down the surrounding area
energy leaves the chemical and heats up the surrounding area
Answer:
energy leaves the chemical and heats up the surrounding area
Explanation:
6. Write the full symbol for an atom with 1 proton, 2 neutrons, and 0 electrons.
Answer:
The element hydrogen has the simplest atoms, each with just one proton and one electron. The proton forms the nucleus, while the electron orbits around it.
Explanation:
Using the following thermochemical equation, calculate how much heat is associated with the decomposition of 4.00 moles of NH4Cl.
NH3(g) + HCl(g) è NH4Cl(s) ΔH = -176 kJ
A) 5000
B) 740
C) 407
D) 704
Answer:
D
Explanation:
[tex]4 \times - 176 = - 704[/tex]
Answer:
D - 704
Explanation:
The balanced thermochemical equation relates the energy change to moles, not grams, so we first convert the amount of NH4Ck to moles and then use the thermochemical equation to determine the energy change:
4.00 mole NH4Cl x (-176 ÷ 1 mole NH4Cl)
= -704
Earth's atmosphere blocks short wavelengths of the electromagnetic spectrum. Which telescopes must be places in orbit around Earth in order to observe short-wavelength radiation?
Answer: gamma-ray telescopes
Explanation:
this is the answer because the question is asking what telescope must be
placed to observe SHORT-WAVELENGTH radiation. Gamma-rays have very short wave-lengths so therefore it would be gamma-ray telescopes. visible, infrared, and radio all have long wave-lengths, so we can instantly eliminate them.
The Earth's atmosphere is known to be able to blocks all X-rays from space. telescopes must be places in orbit around Earth in order to observe short-wavelength radiation is gamma-ray telescope.
X-rays is known to have high energy that are in reflecting telescope. Gamma rays from space is commonly blocked by the Earth's atmosphere as the radiation is lethal.
Gamma-ray telescope is known to be an instrument that is created to detect and resolve gamma rays from space. that is beyond Earth's atmosphere.This rays are able too be detected by the optical flashes that they emit when interacting with the material in a particular defined instrument.
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formula equation is more informative than a word equation why
Answer:
yes
Explanation:
this is because the formula equation shows the details on how they solved the equation
What element is represented in this model of the atomic number is 3
This is science
Answer:
lithium because it has an atomic number of three(you could have just googled which element has the atomic number 3)
collectiveness leads to a good society? how
Answer:
A good society has a transparent talk, they share all matters related to the society, hence everyone knows what's going on. This is why collectiveness leads to a good society.
If my answer helped, kindly mark me as the brainliest!!
Thank You!!
A student asks a serious of questions about a wave. The answer to which question will allow the student to determine whether the wave is electromagnetic or mechanical?
Answer:
Does the wave require a medium in order to travel?
Explanation:
The question whose answer would determine whether the wave in question is mechanical or electromagnetic would be if the wave requires a medium in order to travel or otherwise.
A mechanical wave would require a medium in order to transport its energy from one place to another, that is, travel. On the other hand, an electromagnetic wave does not require any medium in order to travel, that is, it can travel through vacuums or empty spaces. Light and sound waves are typical examples of electromagnetic and mechanical waves respectively.
1. How many times will a mole of paperclips (think giant paperclip chain) stretch around the equator of the
earth? (1 paperclip = 0.030 m, Earth's circumference = 4.00 x 10m)
What are the common characteristics among acidic compounds? Basic?
Answer:
turns blue litmus red
reacts with metal
increase hydrogen concentration
helpppppppp meeeeeee
Answer:
Synthesis
General Formulas and Concepts:
Chemistry - Reactions
Synthesis Reactions: A + B → AB Decomposition Reactions: AB → A + B Single-Replacement Reactions: A + BC → AB + C Double-Replacement Reactions: AB + CD → AD + BCExplanation:
Step 1: Define RxN
RxN: NH₃ + H₂SO₄ → (NH₄)₂SO₄
Step 2: Identify
Combining 2 compounds to form 1.
NH₃ + H₂SO₄ → (NH₄)₂SO₄
A + B → AB
It is a Synthesis Reaction.
The density of red wine is 1.01g/cm3 and the density of olive oil is 0.92g/cm3.A salad dressing that consisted of these two ingredients was left sitting too long.The ingredients separated in the bottle ,which ingredient is which layer? Explain.
Answer:
The olive oil will be on top of the vinegar, this is because the density is more
Explanation:
since vinegar has a higher density than oil it will sink to the bottom of the bottle. subsequently oil will raise up. thus oil higher layer vinegar lower layer! :) . concentration in g/L....what u are given is 5.4g and 50ml
so first change the ml into L
50ml = 0.050L
now... 5.4g/0.050L = 108g/L
resolve in significant figures is 1.1 x 10^2 g/L
b. molarity = mol/L
L = 0.050 (calculated from above)
now we only have to convert the grams (5.4g) into mols
there are three elements in sucrose ( C = carbon, H = hydrogen
and O = oxygen)
look at the periodic table and find their molar mass (atomic weight)
Carbon = 12.0g/mol
Hydrogen = 1.00g/mol
Oxygen = 16.0g/mol
Sucrose contains 12 carbons, 22 hydrogens, and 11 oxygens
So the total molar mass of sucrose =
Carbon - 12 x 12.0 = 144
Hydrogen - 22 x 1.00 = 22
Oxygen - 11 x 16.0 = 176
Total = 144 + 22 + 176 = 342g/mol
Now u have 5.4grams of sucrose to change to mols u:
5.4 grams x 1 mol/ 342grams
in other words 5.4 grams / 342 grams leaving u with mols
= 0.0158 mols
now your concentration in molarity will be:
0.0158 mols / 0.050L = 0.32M (two significant figures)
and the unit is M which stands for mol/L
c. you are given 7M (aka mol/L)
you are given 100ml which equals 0.1L
7 mol/L x 0.1L = 0.7mol
all u have left to do is change the 0.7 mol back into grams
to do that we do the opposite of what we did in part b
in part b u took grams and changed it into mols
here we are taking mols and changing it back into grams
from part b we calculated the total molar mass = 342g/mol
so:
0.7 mol x 342 g/mol = 239.4grams
resolve into significant figures = 2 x 10^2 grams
Farmers use conservation practices such as crop rotation to insure that their crops are sustainable. Crop rotation is the process of moving crops to a new location to get the nutrients from the soil needed for that specific crop to grow. What conclusion can be drawn if farmers do not use soil conservation practices such as crop rotation?
A.
If farmers do not use soil conservation practices, the topsoil, which contains weathered rocks, will not be fertile to promote plant growth because of loss of nutrients from the soil.
B.
If farmers do not use soil conservation practices, the topsoil, which contains weathered rocks, will be fertile to promote plant growth because of the loss of nutrients from the soil.
C.
If farmers do not use soil conservation practices, the topsoil, which contains humus, will not be fertile to promote plant growth because of the loss of nutrients from the soil.
D.
If farmers do not use soil conservation practices, the topsoil, which contains humus, will be fertile to promote plant growth because of the loss of nutrients from the soil.
Answer:
C. If farmers do not use soil conservation practices, the topsoil, which contains humus, will not be fertile to promote plant growth because of the loss of nutrients from the soil.
Explanation:
The top soil is rich in humus and not weathered materials. It is not close to the bedrock. Rather, the topsoil is rich in organic matter and it is present as humus in the soil.
If crop rotation is not being practiced, the soil's nutrients would be highly depleted without replenishing them back. With crop rotation the top soil can be made more fertile when it is left uncultivated for a period of time. Instead of heavily relying on a single piece of land, crops can rotated on a timed basis so that soils will have enough time to restore their nutrients.1. H2SO4, sulfuric acid, contains three different types of atoms: hydrogen (H), sulfur (S), and oxygen (O). Each of these atoms represents a different . Since the three types are combined in a fixed ratio, this means that H2SO4 is a(n) molecule. 2. The smallest unit of matter that retain all of the physical properties of that type of matter is a(n) atom. 3. is anything that occupies space and/or has any substance. 4. If two or more atoms are bonded together, they form a(n) . 5. The scientific study of matter is called . 6. Within a plant, water (H2O) and carbon dioxide (CO2) can be combined (using the energy of sunlight) to produce glucose (C6H12O6) and oxygen (O2). If you were to write out this chemical reaction, water and carbon dioxide are each an example of a(n) while glucose and
Answer:
The blanks can be completed with words in the following sequence
1) elements
compound
2) atom
3) matter
4) compound
5) chemistry
6) reactants
product
Explanation:
In H2SO4, atoms of hydrogen, sulphur and oxygen represent different elements that are combined to form the compound.
The smallest indivisible unit of matter that still retains all the properties of matter is an atom. Matter is anything that has weight and occupy space.
Atoms combine in fixed ratios to form compounds. Chemistry studies matter scientifically and pays specific attention to the changes that matter undergoes.
Considering the reaction of photosynthesis, water and carbon dioxide combine to give glucose so the water and carbon dioxide are reactants while the glucose is the product of the reaction.
What else is produced during the combustion of butane, C4H10?
2C4H10 + 13O2 8________ + 10H2O
Answer:
CO2
Explanation:
What is the oxidation state of Hg in Hg2Cl2?
Answer:
+1
Explanation:
Electrochemistry. In oxidation–reduction (redox) reactions, electrons are transferred from one A redox reaction is balanced when the number of electrons lost by the reductant Hg(l)∣Hg2Cl2(s)∣Cl−(aq) ∥ Cd2+(aq)∣Cd(s).
As is evident from the Stock number, mercury has an oxidation state of +1. This makes sense, as chlorine usually has an oxidation state of -1.
The oxidation state of Hg in Hg₂Cl₂ compound is +1 as both subscripts of elements are eliminated.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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Given the balanced equation representing a reaction:
4Al(s) + 3O2(g) → 2Al2O3(s)
Which type of chemical reaction is represented by this equation?
Answer:
The equation is already balanced.
The type of chemical reaction is oxidation
Explanation:
Oxidation is the addition of oxygen to a substance
Answer:
This type of reaction is a synthesis reaction
Explanation:
What liquid is the most vicious ?
A) water
B) skim milk
C)salt water
D) pancake syrup
Please help me It would mean everything!!
1. high
You are correct.
Cold region have more air pressure because air is denser.
A solution that has a high concentration of hydrogen ions has what type of pH?
7
14
13
2
Answer:
2
Explanation: