The volume of 0.500 m stock solution of NaNO3 needed to produce 1.000 l of 0.0755 m solution of NaNO3 through dilution is 151 ml.
Dilution is defined as the process of decreasing the concentration of solute in a solution by adding more solvent. The relationship between the initial and final concentration and volume of a solution is represented by the equation below.
C1V1 = C2V2
where C1 = concentration of stock solution
V1 = volume of stock solution needed for the dilution
C2 = desired concentration of solution
V2 = desired volume of solution
Given:
C1 = 0.500 m
C2 = 0.0755 m
V2 = 1.000 l = 1000 ml
Use the equation to solve for the volume of stock solution needed for the dilution.
C1V1 = C2V2
(0.500 m) V1 = 0.0755 m(1000 ml)
V1 = 151 ml
volume of stock solution needed for the dilution = 151 ml
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evidence suggests that living things have changed over time some fossils of long dead organisms show what certain species looked like long ago genetic testing also provides evidence to support the relationship between extinct and modern organisms does this information support a low or a theory
A major unifying concept in biology is evolution. "Nothing in biology makes sense except in the light of evolution," Theodosius Dobzhansky once said.
Numerous branches of biology provide proof of evolution:
Anatomy: Because a physical characteristic was present in the following common ancestor, species may have similar physical characteristics (homologous structures).
the study of molecules. The genetic code and DNA show how life has a common ancestor. Comparing species' DNA can reveal how closely related they are.
Biogeography : Evolution and geological change are reflected in the global distribution of creatures as well as the distinctive characteristics of island species.
Fossils : The existence of species that are related to modern species but are now extinct is documented through fossils.
Direct perception: in creatures with brief life cycles, small-scale evolution can be seen directly (e.g., pesticide-resistant insects).
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How many moles are there in a 3.56g sample of copper (Cu)?
A)1 mole
B)226 moles
C)0.0560 mole
D)17.8 moles
Which is an example of poor safety practices when working outdoors?
O A. Cleaning up your trash
B. Wearing gloves when working with soil
C. Wearing a helmet in dangerous areas
OD. Eating a plant to test it
Answer:
A poor safety practice would be to eat a plant to test it.
Explanation:
D. Eating a plant to test it.
→ You shouldn’t eat a random plant without knowing what it is or without washing it.
hopefully this helps you ^^
Answer:
D. Eating a plant to test it
Explanation:
Cleaning up, wearing gloves and a helmet are safe when working outdoors. Eating certain plants can be harmful, especially if you're not familiar with it.
Which two elements make up this mixture, element C and B element C, and an element D and C or element B And D?
How many 325 mg aspirin tablets can be made from 875 g of aspirin?
Answer: 35/13
Explanation:
Use the factor label method and determine the number of grams of water present in 55.89g of CoCl•6H2O
The mass (in grams) of water, H₂O present in 55.89g of CoCl•6H₂O is 29.82 g
How to determine the mass of water, H₂OWe can obtain the mass of water in 55.89 g of CoCl•6H₂O as illustrated below:
Molar mass of CoCl•6H₂O = 58.9 + 35.5 + 6[(2×1) + 16] = 94.4 + 6[18] = 202.4 g/molMolar mass of water, H₂O = (2×1) + 16 = 18 g/molMass of CoCl•6H₂O = 55.89 gMass of water, H₂O =?Mass of water = (6H₂O / CoCl•6H₂O) × total mass
Mass of water = [(6 × 18) / 202.4] × 55.89
Mass of water = [108 / 202.4] × 55.89
Mass of water = 29.82 g
From the calculation made above, we can conclude that the mass of water in the 55.89 g of CoCl•6H₂O is 29.82 g
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Relative to other substances, water tends to resist changes in temperature. Why?.
Water is highly cohesive. Its molecules tend to resist increases in their motion.
Explanation:When water is heated, some of the energy is used to disturb the hydrogen bonds between neighboring molecules.
Water is abundant. Large bodies of water resist changes in their temperature simply because they are massive objects.
Water is highly cohesive. Its molecules tend to resist increases in their motion.
Due to its extreme density, water can absorb a lot of heat with only a small change in temperature, much like all other dense materials.
Water is very sticky. If water is bonded to another substance, the molecules will tend to "stay put" and resist increases in motion.
Pure water does not resist temperature change.
The hydrogen bonds between water molecules give water the ability to hold heat better than many other substances.
As the temperature rises, the hydrogen bonds between water continually break and reform, allowing for the overall temperature to remain stable, although increased energy is added to the system.
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Relative to other substances, water tends to resist changes in temperature because it's highly cohesive.
What is cohesion?The linguistic concept of cohesion describes the way that a sentence's or a text's structure and content are connected to produce meaning.
The gravitational force that draws molecules of a given material together.
Solids, it is the most powerful, followed by liquids and gases, which are less powerful.
The interactions of water molecules with one another and with other objects, such as leaves or even you, are described by the two water properties of cohesion and adhesion.
Both cohesion and adhesion refer to how much water prefers to attach to itself and other objects.
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Lithium is the least dense metal know with a density of 0.53 g/cm³. What is the volume occupied by 1.20x10³ grams of lithium
Answer:
2264.15 cm³Explanation:
The formula for finding the volume of an object given it's mass and density is given by
[tex]volume = \frac{mass}{density} \\ [/tex]
From the question
mass = 1.2 × 10³ grams
density = 0.53 g/cm³
We have
[tex]volume = \frac{1.2 \times {10}^{3} }{0.53} = 2264.1509\\ [/tex]
We have the final answer as
2264.15 cm³
Hope this helps you
If you omit baking soda from a recipe, the final product's texture isn't as light and fluffy as you would expect it to be. What does that tell you about the state of at least one of the products from the reaction?
If you omit baking soda from the recipe, the product's texture isn't as light and fluffy, it is because baking soda is a salt that rises the dish.
What is baking soda?Baking soda is sodium bicarbonate, and it is the bicarbonate of soda. It is a salt of sodium and bicarbonate. Its chemical formula is NaHCO3.
It is used as an antacid, and it is also used in baking dishes, such as cakes, biscuits, etc. Baking soda is sued in baking because it rises the cakes and makes it fluffy and soft.
Thus, not using baking soda will make the dishes hard and the dish will not rise.
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2. A lamp weighs 78 pounds; this would be how many kilograms?
a pound is 0.45359237 kilograms if you do it out or you could round it to 0.45
so 78 pounds is 35.3802049 kilograms, or you could round it to 35.38
if you liked my answer, please rate thanks and award brainliest
hope this helped :)
A continental polar air mass moves into an area. based on the characteristics of this type of air mass, which changes are most likely to happen in the area?
The change that is likely to occur is that :
The temperature will decrease and humidity will increase.
What is a continental polar air mass?Continental Polar air masses are air masses that are cold and dry due to their continental source region.
When a continental polar air mass moves into an area, the following will happen:
The temperature will decrease and humidity will increase.maritime polarmaritime tropicala warmer air mass moves into the area and rises.maritime polarContinental air masses are characterized by dry air near the surface while maritime air masses are moist.
Continental polar air masses are also characterized by cold, dry, and stable but they are not as cold as the artic air masses.
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the contents of a truck containing 400 crates of avocados are correctly insured for $2000. How many avocados are in an average selection of 12 crates, if an average avocado weighs 0.4 pound and the value of avocados is $0.30 per pound?
The number of avocados in an average selection of 12 crates is 500 avocadoes.
What is the total number of avocadoes in the truck?The total number of avocadoes in the truck is determined from the correct insurance value f the avocadoes.
The total number of avocadoes in the truck is calculated as follows:
Weight of one avocado = 0.4 pound
Value of avocado per pound = $0.30
Value of one avocado = $0.30 * 0.4
Value of one avocado = $0.12
Value of one crate of avocado = $2000/400
Value of one crate of avocado = $5
Number of avocadoes per crate = 5/0.12 41 avocadoes
Number of avocados in an average selection of 12 crates = 5/0.12 * 12
Number of avocados in an average selection of 12 crates = 500 avocadoes
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an atom of an element has 15 protons and 16 neutrons what is the proton number
Answer: I assume you mean the atomic number.
The atomic number would be 31.
acetanilide has a solubility of 1.00 g/185 ml in 25 0c water and 1.00 g/10 ml in 100 0c water. if 250 mg of acetanilide was dissolved in 2.5 ml of water, how much acetanilide would remain in solution when the solution was cooled to 25 0c?
The remaining acetanilide when the solution was cooled to 25°C is 13.513 mg.
What happens in the crystallization process?
The solid compound is dissolved in the solvent at elevated temperatures during the crystallization process, and the crystallized product is obtained by slowly cooling the solution.
Given that,
The solubility of acetanilide at 100°C is 1 g per 10 mL of water. Thus, to dissolve 250 mg of acetanilide at a high temperature, that is 100 °C, we need 2.5 mL of water. At 25°C after the re-crystallization there will be some dissolved acetanilide, which can be calculated as- 185mL of water is needed to dissolve 1g or 1000mg of acetanilide at 25°C. Thus, in 2.5 mL of water, there will be
(2.5×1000)/185 = 13.5135 mg of acetanilide.
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what is net ionic equation for the reaction shown below? AgNO3(aq)+NaCl(aq)=AgCl(s)+NaNO3(aq)
The net Ionic equation for the reaction is
Ag⁺+ Cl⁻→ AgCl
The symbolic depiction of a chemical reaction using symbols and equations is known as a chemical equation.Spectator ions are ions that are present on both sides of chemical reactions but do not take part in the reaction itself. The spectator ions on both sides of the equation are cancelled in the net chemical reaction.Steps for writing net ionic equation:
write the balanced chemical equation.Split soluble compounds into ions.cross out the spectator ions on the both side of the ionic equation.Write the remaining substances as net ionic equation.Balanced Chemical equation:
AgNO₃(aq) + NaCl(aq) → AgCl(s) + NaNO₃(aq)
Splitting
Ag⁺ + NO³⁻ + Na⁺ + Cl⁻ → AgCl + Na⁺ + NO³⁻
Net Ionic Equation
Ag⁺+ Cl⁻→ AgCl
Na⁺ and NO³⁻ are spectator ions, hence they are not included in the net ionic equation. Because it exists in solid form, AgCl cannot be separated into ions.
Therefore, net ionic equation is
Ag⁺+ Cl⁻→ AgCl
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Which element has 3 valence electrons and 3 energy levels?
Answer:
aluminum has 3 energy levels and 3 valance electrons
Michael wanted to see what kitchen cleaner worked best for cleaning her counters. She used Lysol, Clorox, Pine-Sol, and just water. For each cleaner, he put 5 mm of grape juice on the counter, sprayed the cleaner, and wiped it with one paper towel. What is the independent variable in this scenario?
The independent variable is simply given as type of kitchen cleaner. Option B
This is further explained below.
What is the independent variable?Generally, The definition of an independent variable is precisely the same as its name.
It is a variable that is independent of the other factors that you are attempting to measure and does not change as a result of those variables.
For instance, the age of a person may be considered an independent variable.
In conclusion, The kind of kitchen cleaner is the only information provided for the independent variable. Alternative B
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CQ
Michael wanted to see what kitchen cleaner worked best for cleaning her counters. He used Lysol, Clorox, Pinesol, and just water. For each cleaner, he put 5 milliliters of grape juice on the counter, sprayed the cleaner, and wiped with one paper towel. What is the independent variable?
answer choices
amount of grape juice
type of kitchen cleaner
how well the grape juice stain was removed from the counters
the time it took to clean the counter top
.115km=_______cm
Please I need help!
Explanation need
Answer:
online it says .115km equals 11500cm
Suppose you have 100. 00 ml of a solution of a dye and transfer 2. 00 ml of the solution to a 100. 00ml volumetric flask. After adding water to the 100. 00 ml mark, you take 5. 00 ml of that solution and again dilute to 100. 00 ml. If you find the dye concentration in the final diluted sample is 0. 000158 m, what was the dye concentration in the original solution.
Using the dilution formula, the dye concentration in the original solution was 0.158 M.
What was the dye concentration in the original solution?The dye concentration in the original solution is determined from the dilution formula as follows:
M₁V₁ = M₂V₂Where M₁ = initial concentration
V₁ = original volume
M₂ = final concentration
V₂ = final volume
For the final dilution:
M₁ = M₂V₂/V₁
M₁ = 0.000158 * 100/5
M₁ = 0.000316 M
For the first dilution:
M₁ = M₂V₂/V₁
M₁ = 0.00316 * 100/2
M₁ = 0.158 M
Therefore, the dye concentration in the original solution was 0.158 M.
In conclusion, the dye concentration in the original solution is obtained using the dilution formula.
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Examine the table for the densities of various substances above. If a student has an unknown substance with a mass of 51.3 g and a volume of 4.5 ml. A milliliter is equivalent to a cubic centimeter. Which statements can be supported by the information given here? Select ALL that apply.
Answer:
maby all of them vote from I'll pay get did you
A 5. 00 gram sample of lead and a 3. 20 g sample of iron are placed into 367 ml of water. What will be the new volume level of water in units of ml? the density of lead is 11. 34 g/cc and the density of iron is 7. 874 g/cc. Do not enter ""ml"" as part of your answer.
The new volume level of the water is 357.84 ml.
The mass of the lead sample = 5 gm
The mass of the iron sample = 3.2 g
The volume of the water = 367 ml
The density of lead = 11.34 g/cc
The density of iron = 7.874 g/cc
[tex]Density = \frac{Mass}{ Volume}[/tex]
[tex] Volume = \frac{ Mass}{Density}[/tex]
The volume of the lead is,
[tex]Volume = \frac{Mass \: of \: lead}{ Density \: of \: lead}[/tex]
[tex] \frac{5}{11.34} [/tex]
= 0.441 ml
The volume of lead is 0.441 ml.
The volume of the iron is,
[tex]Volume = \frac{Mass \: of \: iron}{ Density \: of \: iron}[/tex]
[tex] = \frac{3.2}{7.874} [/tex]
= 0.406 ml
The volume of iron is 0.406 ml.
The new volume level of the water sample is,
New volume = Original water volume + Volume of lead + Volume of iron
= 367 + 0.441 +0.406
= 367.84 ml
The new volume level of the water is 357.84 ml.
Therefore, the new volume level of the water without the unit is 357.84.
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Need help with chemistry homework use the density of palladium (d = 12.1 g/cm3) to determine the volume in cubic centimeters of a sample that has a mass of 44.1 ounces. (1 ounce = 28.35 grams)
The volume of the palladium is 103.3 cubic centimeters.
What is the palladium density?Palladium is a metal in Periodic Table Group VIII with the atomic number 46, atomic weight 106.4, and density 12 Mg/m3. It has a melting point of 1552 C and a boiling point of 3980 C.Density is the number of things (people, animals, plants, or objects) in a given area. To calculate density, divide the number of objects by the area measurement. A country's population density is the number of people divided by its area in square kilometers or miles.We know that;
1 ounce = 28.35 grams
44.1 ounces = 44.1 ounces * 28.35 grams/1 ounce
= 1250.23 g
Density = mass/volume
volume = mass/Density
volume = 1250.23 g/12.1 g/cm3
volume = 103.3 cubic centimeters
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The palladium has a volume of 103.3 cubic millimeters.
What is density?A substance's density is determined by how much mass or amount there is per unit of volume.
Mass divided by volume is the formula for density.
On the periodic table, density varies from element to element and is influenced by external factors like temperature and atmospheric pressure.
1 pound equals 28.35 grams.
1 ounce = 28.35 grams, thus 44.10 ounces equals 1250.23 grams.
Mass/volume = Density.
Volume = Mass / Density.
For example, volume = 1250.23 g times or 12.1 g per cubic centimeter.
Volume = 103.3 cubic centimeters
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A piece of metal is placed in a clear solution. Bubbles form and the metal disappears. The mass of the final solution is less than the mass of the
first solution and the metal. Is this an exception to the law of conservation of mass? Explain.
Metals on reaction with acids liberate Hydrogen gas. This is the reason why bubbles are formed in the solution.
When the metals reacts with acids the mass of the metal will decreases with the liberation of hydrogen gas . This can acts as a exception for law of conservation of mass.
What is law of conservation mass?The law of conservation of mass determines that in a chemical reaction mass can neither be created nor destroyed. For instance , the carbon atom in coal as carbon dioxide when it is burned. The carbon atom transforms from a solid structure to a gas but its mass doesn't changes.
Does mass increase or decrease after a chemical reaction?The principle states that the mass of matter, in a closed system, will always be the same no matter what type of change can happens to the matter. Whether it's a change in state, or dissolving, or a chemical reaction, or any combination , the amount of mass will not be change.
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using the results of our calculations in class (you do not need to rederive these relationships, just use them!), what is the maximum radius of an atom that will just fit into a octahedral hole site in fcc ni without distorting the structure?.... the octahedral hole site of bcc fe
The radius of the atom that just fits into the octahedral site is 0.414 times the radius of Fe.
What is the radius ratio rule?The ratio of a cation's lower ionic radius to its greater ionic radius (anion) is known as the radius ratio.
What is the importance of this rule?This rule aids in figuring out how ions are arranged in distinct crystal formations. It aids in determining an ionic crystal structure's stability.
According to the limiting radius ratio,
= 0.414
R = radius of an atom
r = radius of Fe
Hence, the radius of the atom that just fits into the octahedral site, R = 0.414 ×r
R= 0.414 times radius of Fe(r)
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A cube of gold-colored metal with a volume of 54 cm3 has a mass of 980 g. The density
of gold is 19.3 g/cm3. Is this sample of metal pure gold?
Answer:
A gold-colored metal with a volume of 59 cm3 and a mass of 980 g will have a density of 16.61 g/cm3 instead of 19.3 g/cm3
Recall that the density of a substance is the ratio of its mass and that of its volume.
In other words; density = mass/volume
In this case, the mass of the gold-colored metal is 980 g while the volume is 59 cm3
density of the metal = 980/59
= 16.61 g/cm3
Thus, the density of the gold-colored metal is 16.61 g/cm3, instead of 19.3 g/cm3
Explanation:
oxygen forms a number of compounds with sulfur, many of which are quite reactive. one such compound is 57.20 % by mass s . calculate the number of grams of oxygen present in a sample of this compound that contains 56.00 grams of s .
The grams of oxygen present in a sample of this compound that contains 56.00 grams of S = 41.9g of oxygen.
Calculation of quantity of OxygenThe compound contains the following:
Sulphur = 57.20%
Oxygen = 100 - 57.20 = 42.80%
If 57.20% of the sample contains 56g of Sulphur, then 42.80% of the sample will contain X.
Make X the subject of formula,
X = 42.8 × 56/57.20
X= 1712/57.20
X= 41.9g of oxygen
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Which family on the periodic table has the highest effective nuclear charge
O Halogens
O Noble gases
O Alkaline earth metals
Alkali metals
The noble gases family on the periodic table has the highest effective nuclear charge as compared to other groups in the periodic table.
What does greatest effective nuclear charge mean?A higher effective nuclear charge leads to greater attractions to the electrons which results in pulling of electron closer to the nucleus which causes in a smaller atomic radius of the atom. When we move down the group, the number of shells or orbits increases, so there is a greater distance between the nucleus and the outermost shell. Effective nuclear charge increases when we move from left to right in the periodic table due to the increasing of atomic charge and shielding effect. Due of a same number of shielding electrons across a period, the valence electrons are pulled more strongly by the protons present in the nucleus. Effective nuclear charge increases when we move from left to right in the periodic table while on the other hand, effective nuclear charge decreases down the group in the periodic table.
So we can conclude that the noble gases family on the periodic table has the highest effective nuclear charge as compared to other groups in the periodic table.
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A block has a density of 1.73g/mL. What is the block’s density in mg/L
The formula when converting g/mL to mg/L is to multiply the mass / volume value by 1e+6
When we do this we come up with 1,730,000
This however, should be written as either 1.73⋅10^5 or 1.73E+5.
a 8.638.63 g sample of calcium sulfide was decomposed into its constituent elements, producing 4.804.80 g of calcium and 3.833.83 g of sulfur. which of the statements are consistent with the law of constant composition (definite proportions)?
An 8.638.63 g sample of calcium sulfide was decomposed into its constituent elements and the statement is that every sample of calcium sulfide will have 44.4% mass of sulfur.
Law of Constant compositionAccording to the law of definite proportions, which is also known as the law of constant composition, pure compound samples always contain the same elements in the same mass proportion.
Stoichiometry in chemistry is also based on this concept and also the law of multiple proportions.
Every sample of a given chemical composition will consist of the same elements in the same combination or ratio.
The statements and percentage can be calculated asIt is given that,
an 8.638g sample was decomposed into its constituents.
It is producing a total of 4.804g calcium and 3.833g of sulfur.
The mass ratio of Ca: s = 4.804/3.833
=1.253
⇒ mass of calcium = 40.078
mass of sulfur = 32.068
Total mass of CaS = 72.146 grams
mass percentage of Ca = 40.078/72.146 x 100
=55.56%
mass percentage of S = 32.068/72.146 x 100
=44.44%
Thus, in each kind of sample the mass percentage of calcium along with sulfur in every sample is equal to 100%.
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Complete Question
A 8.63 gg sample of calcium sulfide was decomposed into its constituent elements, producing 4.804 g of calcium and 3.833 g of sulfur.
Which of the statements are consistent with the law of constant composition (definite proportions)?
A) Every sample of calcium sulfide will have 3.36 g of calcium.
B) The mass ratio of Sto Ca in every sample of calcium sulfde is 0.80.
C) The ratio of calcium to sulfur will vary based on how the sample was prepared.
D) Every sample of calcium sulfide will have 44.4% mass of sulfur.
E) The mass percentage of calcium plus the mass percentage of sulfur in every sample of calcium sulfide equals 100%.
. if you are presented with the structure a carbon-containing compound, or trying to draw one yourself, what is the rule about the number of covalent bonds to carbon that are normally found in these structures?
The number of covalent bonds formed by carbon is four.
What kind of bond does carbon form?Covalent bonds are formed between carbon atoms and atoms of other elements or carbon. Carbon compounds come in a wide variety, with atom counts ranging from one to thousands.
Since carbon has four valence electrons, it can create four covalent bonds to reach its full outer energy level. The most stable configuration of electrons is at the maximal outer energy level.
Covalent bonds formed between carbon atoms can be single, double, or triple bonds. One pair of electrons is shared by two carbon atoms to form a single bond. They share two pairs of electrons in a double bond and three pairs in a triple bond.
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