As water changes state, the mass of the sample changes.
What happens when water molecules change from liquid to gas?The hydrogen bonds between water molecules completely dissolve when the heat is increased during the boiling process, allowing water molecules to escape into the air as gas.
The potential energy decreases as that of the liquid cools, which causes the molecules to begin to move more slowly. Ice is created when the molecules of water adhere to one another at a temperature of about 0°C. The molecules are still moving despite being in this solid state; we can't see it.
Water's molecular structure never changes, even though it can transition from a liquid state to a solid or gas state and back again.
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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:
What does the term “combining capacity” mean?
Answer:
Its valency
The number of valence electrons of an atom gives us an idea of the combining capacity. The number of valence electrons of an atom gives us an idea of the combining capacity.
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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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. 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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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
Your lab supervisor tells you to heat a chemical until it is 165 degrees* F . What should your thermometer (which measures in C) read when it reaches the correct emperature ?
Answer:
73.8888 repeated
Explanation:
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.
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
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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suppose 2 pints of a 19% alcohol solution is mixed with 8 pints of a 90% alcohol solution. what is the concentration of alcohol in the new 10-pint mixture
If we suppose 2 pints of a 19% alcohol solution is mixed with 8 pints of a 90% alcohol, then the amount of alcohol is calculated as 92.8%
What is molarity?A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration.
Molarity (M) is the amount of a substance that is present in a certain volume of solution.
Molarity is defined as the moles of a solute per liters of a solution which can further be formulated as:
M= Moles of the solute/ volume of solution.
Herein we have
0.19 (2 pints) + 0.90 (8 pints) = 9.28 pints
So, the concentration is:
9.28 pints / 10 pints × 100% = 92.8%.
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A beaker contains a mixture of sand and salt. A student adds water to dissolve the salt. Which processes can be used to separate out the sand and salt?
Filtration and evaporation are used to separate sand and salt mixture.
Separation of salt and sand mixture is as follows :-
The mixture of salt and sand is separated by filtration followed by an evaporation processes.Filtration is used to separate sand from a combination of sand and salt solution Sand is left on the filter paper as a residue after filtering. By boiling the filtrate left on filter paper , common salt may now be produced. Boiling causes all of the water to evaporate, leaving salt behind . This is known as evaporation.In other words, based on the fact that salt is soluble in water, while sand is not. So, you used the difference in solubility to separate a mixture of sand and salt.
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Answer: Filtration to collect the sand and distillation to collect the salt.
Explanation:
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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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 the name for NaCl?
Answer: Sodium Chloride
Explanation:
Na= sodium Cl= Chloride
Answer
is Nacl
Explanation:
NacI
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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.115km=_______cm
Please I need help!
Explanation need
Answer:
online it says .115km equals 11500cm
13. In a science experiment, the
manipulated or changed.
dependent
stipulated
independent
none of the above
variable is the one that is
Answer:
In a science experiment, the
manipulated or changed.
= Independent variable
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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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. How do molecules move during passive transport?
In passive transport, substances move from an area of higher concentration to an area of lower concentration in a process called diffusion. A physical space in which there is a different concentration of a single substance is said to have a concentration gradient.
In passive transport, substances move from an area of higher concentration to an area of lower concentration in a process called diffusion. A physical space in which there is a different concentration of a single substance is said to have a concentration gradient.
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.
How many 325 mg aspirin tablets can be made from 875 g of aspirin?
Answer: 35/13
Explanation:
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.
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
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Which two elements make up this mixture, element C and B element C, and an element D and C or element B And D?
The speed limit on a many u.s. highways is 70 miles per hour. convert this speed to kilometers per day.
The speed limit on a many highways is 70 miles per hour. this speed to kilometers per day is 2703.69 km / day.
The speed limit on u.s highways is given as,
speed = 70 miles per hour or 70 mile / h
we have to convert it in kilometers per day,
so,
1 miles = 1.609344 kilometers
and, 1 day = 24 hours
therefore, in 1 hour = 1/ 24 day
applying above values, we get,
70 mile per hour = ( 70 × 1.609344 ) kilometers × 24 / day
70 miles per hour = 112.65408 kilometers × 24 / day
70 miles per hour = 2703.698 kilometers per day
Hence,The speed limit on a many highways is 70 miles per hour. this speed to kilometers per day is 2703.69 km / day.
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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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When 50. 08 g of 1. 00 m naoh at 23 °c is added to 50. 22 g of 1. 00 m hcl at 23 °c, the resulting temperature of the mixture is 29. 7 °c. Is the reaction endothermic or exothermic?.
When 50.08 g of 1.00 M NaOH at 23°C is added to 50.22 g of 1.00 M HCl at 23°C, the resulting temperature of mixture is 29.7°C, then the reaction is exothermic.
An exothermic reaction is a reaction which results in the energy release from a system. Energy is emitted, so there is a decrease in the energy. Thereby, the change in enthalpy is negative.
The amount of heat gained or lost by a sample in a reaction is calculation by using the equation,
q = mcΔT
where,
q = heat energy lost or gained
m = mass of the sample,
c = specific heat
ΔT = change in temperature
Given data :
mass = 50.08 g
c = 4.18 J/gK
ΔT = 29.7°C - 23°C = 6.7 K (we won't change celsius into kelvin as we're calculating the change)
Putting the values,
q = 50.8 x 4.18 x 6.7 = 1422.74 J
We know,
Molality = moles of solute
mass of solute
Moles = molality x mass
= 1.00 M x 50.22 g = 50.22 mol
To calculate change in enthalpy -
ΔH = - 1422.74 J = - 28.33 kJ/mol
50.22 mol
The energy of the product is lower than energy of reactant, it is an exothermic process. Enthalpy change is negative for exothermic reaction.
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Metals participate in two types of single-displacement reactions. A reactive metal can displace _____ gas either from water or from an aqueous acid. A _____ reactive metal can also displace the ion of a _____ reactive metal from solution.
A reactive metal can displace HYDROGEN gas either from water or from an aqueous acid.
A MORE reactive metal can also displace the ion of a LESS reactive metal from the solution.
A more reactive metal (one that forms positive ions more easily) can displace a less reactive metal from a compound. This is called a displacement reaction. Metal can only displace another metal from a compound if it is located above it in the reactivity series.
As a result, the more reactive metal enters the solution as a cation, whereas the less reactive metal's cations are converted to metal. So more reactive metals displace less reactive metals from their salt solutions.
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which of these is a risk of consuming a nonrewable resource at a high rate
One of the risks of consuming a nonrenewable resource at a high rate is that the resource could be depleted quickly. Option A.
What are nonrenewable resources?Nonrenewable resources are natural resources that are naturally replenished or are replenished at a much slower pace than they are being consumed.
Nonrenewable resources are unique from renewable resources in that the latter are replenished at a much faster rate than they can ever be consumed.
Examples of nonrenewable resources include mineral deposits, crude oil deposits, etc. Examples of renewable resources include solar energy, wind energy, etc.
Thus, if nonrenewable resources are consumed at a high rate, it greatly increases the risk of depletion quickly.
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The options to pick from are:
A.) The resource could be depleted quickly.
B.) The resource could be consumed very quickly.
C.) The resource could be replenished very slowly.
D.) The resource could be replenished quickly.
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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