Assuming that the student measured the mass of the elements using a balance and the volume using a graduated cylinder, we can use the following formula to calculate the density:
Density = mass / volume
Let's say the masses of the elements were 10.23 grams, 20.0 grams, and 21.5 grams, and the volumes were 10 mL, 20 mL, and 25 mL respectively.
Then, the densities would be:
Density of element 1 = 10.23 g / 10 mL = 1.023 g/mL
Density of element 2 = 20.0 g / 20 mL = 1.0 g/mL
Density of element 3 = 21.5 g / 25 mL = 0.86 g/mL
What is density?
Density is a physical property of matter that describes how much mass is contained in a given volume of a substance. It is defined as the amount of mass per unit volume, and is typically measured in grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³).
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how many hydrogen atoms are in 2 moles of h2o?
Answer:
1 mole = 6.022×10^23 atoms. 1 water molecule = 2 Hydrogen atoms + 1 oxygen atom. So, 1 mole H2O = 1.2044×10^24 hydrogen atoms. Therefore 2 mole H2O will have 2.4088×10^24 hydrogen atoms.
Explanation:
The temperature of an object increases by 38.1 °C when it absorbs 3647 J of heat. Calculate the heat capacity of the object.
The heat capacity of an object is defined as the amount of heat required to raise its temperature by 1 degree Celsius (or 1 Kelvin). It is denoted by the symbol "C" and has units of J/°C (Joules per degree Celsius) or J/K (Joules per Kelvin).
We can use the formula for heat capacity to calculate its value for the object:
[tex]C = \dfrac{Q}{\Delta T}[/tex]where:
Q is the amount of heat absorbed by the object andΔT is the change in temperature of the object.Substituting the given values, we get:
[tex]C = \dfrac{3647 \: J }{ 38.1\: ^{\circ}C}[/tex]Note that the units of temperature must match (either Celsius or Kelvin) in order for the calculation to be correct. Since the given change in temperature is in Celsius, we can use Celsius for the units of heat capacity as well.
Dividing, we get:
[tex]C = 95.8 \: J/^{\circ}C[/tex]Therefore, the heat capacity of the object is 95.8 J/°C. This means that it requires 95.8 Joules of heat to raise the temperature of the object by 1 degree Celsius (or Kelvin).
[tex]\rule{200pt}{5pt}[/tex]
What is the IUPAC name for the compound shown?
The IUPAC name of the compound is 3-Ethyl-2,2-dimethylhexane.
IUPAC namingIUPAC naming is a systematic method of naming chemical compounds according to a set of rules established by the International Union of Pure and Applied Chemistry. It ensures that each compound has a unique and unambiguous name based on its molecular structure.
From the image:
The longest chain has 6 carbonThe compound is an alkane, thus, the principal chain is a hexaneThere are 2 methyls (CH3) on the second carbonThere is 1 ethyl (C2H5) on the third carbon.Thus, the IUPAC name of the compound is 3-Ethyl-2,2-dimethylhexane.
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What could be the effects of polluting the water in a small mountain stream?
(A) the pollutants could hurt the fish living in the stream
(B) the pollutants could hurt the vegetation growing along the stream
(C)the pollutants could hurt the organisms living in the lake that the stream feeds into
(D)all of the above
Answer:
Explanation:
The pollutants can cause algae to grow quickly. These 'blooms' of algae may produce toxins that harm other life in the river. When the algae die and decay, this uses up much of the oxygen in the stream. Without enough oxygen in the water, invertebrates and fish will suffocate .
Answer:
D, all of the above.
Explanation:
Pollutants have many bad effects on living beings around. All of stated in the answer options makes sense.
Which statement best describes the law of conservation of mass?(1 point)
A) Reactants in a chemical reaction rearrange to form a new substance or substances.
Not college level lol
B) Reactants and products cannot escape from a closed system.
C) Matter cannot be created or destroyed in a chemical reaction.
D) Chemical symbols are used to show atom balance before and after a reaction.
Lesson name) Balanced Chemical Equations Quick Check.
According to one acid-base theory, a molecule acts as an acid
when the molecule
(1) accepts an H+
(2) accepts an OH-
(3) donates an H+
(4) donates an OH-
The Brnsted-Lowry acid-base hypothesis states that when a molecule gives a proton (H+ ion) to another molecule, it behaves as an acid. As a result, the right response is (3) donates an H+.
According to one acid base theory, what is an acid?The Arrhenius theory states that acid is a chemical that causes water to create hydrogen ions. Base is a chemical that causes water to form hydroxide ions.
What underlies acid-base titration's basic premise?A neutralisation reaction takes place during the acid-base titration. Here, the concentration of a particular base or acid is ascertained by neutralisation against an acid or base of known concentration. This kind of titration begins with a drop of an indicator, which changes colour to show the endpoint.
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What is the percent of O in
Ca(С2H302)2?
(Ca = 40.08 g/mol, C = 12.01 g/mol,
H= 1.01 g/mol, O = 16.00 g/mol)
40.5%
Explanation:
Ca×1 = 40
C×4 = 48
H×6 = 6
O×4 = 64
64÷158×100% = 40.5%
0.0002844 moles of water to individual water molecules.
One litre (L) of water (H2O) weighs 1,000 g and has a molar mass of 18 grammes (g). The term "mole" is frequently used to refer to a molecular weight. Hence, 55.6 moles more water are present in 1 litre of water.
How are moles transformed into molecules and mass?How do you translate mass into moles using a formula. By dividing the number the molecules by Avogadro's number, one can determine the number of moles inside a given number of substance molecules. When dividing the mass even by formula mass given in g/mol, one can determine the number de moles in a given quantity of substance.
How are H2O molecules calculated?Using the periodic tables, we can calculate the atomic mass of a elements. We find that hydrogen has an atomic weight of 1, whereas that for oxygen is 16. To calculate the molecular weight of a single water molecule, we add the contributions from each atom, which equals 2(1) + 1(16) Or 18 gram/mole.
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Which of these is not a sign of a chemical reaction?
1. The material dissolves
2. Heat is released
3. A gas is given off
A chemical reaction is known by;
2. Heat is released
3. A gas is given off
How do you know a chemical reaction?A change in color may indicate that a chemical reaction has occurred. For example, when iron is exposed to air and moisture, it rusts and turns from silver to reddish-brown.
If a gas is produced during a reaction, it can indicate that a chemical reaction has occurred. For example, when baking soda is mixed with vinegar, carbon dioxide gas is produced, which causes bubbles to form.
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For the following diagram, select all statements that are true. (Picture provided)
According to given Information:
The energy change of the reaction is -20kJ is true statement, This is exothermic reaction.
What is exothermic?Exothermic meaning that the products of the reaction have lower energy than the reactants.
The negative value of the energy change (-20kJ) indicates that energy is released during the reaction.
What is energy change?Energy change refers to the difference in energy between the products and reactants of a chemical reaction. If the energy change is positive, it means that energy is absorbed by the reaction and the reaction is endothermic.
If the energy change is negative, it means the energy is released by the reaction and the reaction is exothermic. The magnitude of the energy change provides information about the amount of energy that is released or absorbed during the reaction
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The acid should be handled with great care why?
Acids have a strong tendency to corrode. Acid splashing on our flesh can result in severe burns and skin irritation. Therefore, when managing acids, we should exercise caution.
Should one manage strong acids with caution?Although acids and bases are frequently used in a wide range of industrial applications, it's essential to keep in mind that they are hazardous waste and should be handled carefully.
How should laboratory chemicals be handled?When working with concentrated acids or acid solutions, put on chemical splash goggles, chemical-resistant mittens, and a chemical-resistant apron. In a fume cover, work with concentrated acids. In accordance with your requirements, purchase diluted acid solutions. It is safer and simpler to manage, store, and use diluted solutions.
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calculate the mole fraction of HCl in a 9.8% (by mass) aqueous solution. the density of the solution is 1.03 g/mL
The mole fraction of HCl in the given solution is 0.051.
What is the mole fraction of the HCL?To calculate the mole fraction of HCl in the given solution, we need to first find the mass of HCl and water present in the solution.
Let's assume we have 100 g of the solution, so 9.8 g of it is HCl, and 90.2 g is water.
Next, we need to find the moles of HCl present in the solution.
To do this, we divide the mass of HCl by its molar mass.
The molar mass of HCl is 36.46 g/mol (1.01 g/mol for hydrogen + 35.45 g/mol for chlorine).
moles of HCl = 9.8 g / 36.46 g/mol = 0.269 mol
The moles of water can be calculated using its molar mass which is 18.015 g/mol.
moles of water = 90.2 g / 18.015 g/mol = 5.005 mol
The total number of moles in the solution is the sum of the moles of HCl and water.
total moles = 0.269 mol + 5.005 mol = 5.274 mol
The mole fraction of HCl can now be calculated by dividing the moles of HCl by the total number of moles.
mole fraction of HCl = 0.269 mol / 5.274 mol = 0.051
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What physical property of matter can be measured using the triple beam balance?
A
volume
B
mass
C
height
D
length
SUBMIT ANSWER
Answer:
B) Mass- I searched it up
Electrochemical cells generate electricity from which of the following? Select all that apply.
electron transfer
flow of electrons
dissolving an ionic compound
redox reactions
By a redox reaction that involves the transfer of electrons, often through the dissolution of an ionic substance, electrochemical cells produce electricity from the flow of electrons.
What fuels the production of energy by electrochemical cells?In electrochemistry, redox or oxidation-reduction reactions, in which electrons travel from one element to another, can produce electricity. Redox processes involve the transfer of electrons from one substance to another.
In what element are electrochemical cells made?Batteries use a very significant class of oxidation and reduction reactions to produce useable electrical energy. Using solutions of respective sulphates, copper and zinc metals can be combined to create a straightforward electrochemical cell.
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Please help :) almost due
The substance is lithium (Li).
Lithium has an atomic number of 3, which corresponds to the number of protons in its nucleus.The atomic masses or mass numbers of the three isotopes of lithium are 6, 7, and 8, respectively. This indicates that the number of neutrons in the nuclei of these isotopes varies.The three isotopes of lithium, 6 Li, 7 Li, and 8 Li, all have three protons in common, but have varying numbers of neutrons in their nuclei, resulting in distinct atomic weights.Isotopes
Isotopes are atoms of the same element with variable numbers of neutrons but the same number of protons in their nucleus.
Hence, although having different atomic masses, they have the same atomic number.
The physical characteristics of an element's isotopes can differ from their chemical characteristics because of their varied atomic masses.
Isotopes include, for instance:
Carbon: There are three isotopes of carbon: carbon-12, carbon-13, and carbon-14. While Carbon-14 is a radioactive isotope, Carbon-12 and Carbon-13 are stable isotopes.There are three isotopes of hydrogen: hydrogen-1 (also known as protium), hydrogen-2 (sometimes known as deuterium), and hydrogen-3 (also known as tritium). Tritium is a radioactive isotope, whereas protium and deuterium are stable isotopes.Three oxygen isotopes are oxygen-16, oxygen-17, and oxygen-18. The most prevalent isotope is oxygen-16.learn more about isotopes here
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converting moles to mass in grams using dimensional analysis
1. 0.0728 mol to Silicon
2. 5.5mol of H2O
3) 0.0728 of Ca(H2PO4)2
Answer:
Explanation:
1) 0.0728 x (28.086 g Si/ 1mole Si) =2.04 g Si
2) 5.5 mol H20 x (18g H20/1mole H20) = 99 g H2O
3) 0.0728 moles Ca(H2PO4)2 x ( 234 g/ 1mole) = 17.04 g Ca(H2PO4)2
550.0 mL of air is at 20.0 °C. What is the volume at 60.0 °C?
At 60.0 °C, the air has a volume of 1650.0 mL.
At constant pressure, the volume of a gas is directly proportional to its temperature.This means that when the temperature increases, the volume of the gas also increases.
At 20.0 °C, the volume of the air is 550.0 mL.
Using the formula [tex]V2 = V1 *\frac{ T2}{T1}[/tex], where the initial volume and temperature are V1 and T1, respectively, and the end volume and temperature are V2 and T2, respectively.
we can calculate the volume of the air at 60.0 °C.
[tex]V2 = 550.0 mL * (\frac{60.0 \°C}{20.0 \°C})[/tex]
V2 = 1650.0 mL
Therefore, the volume of the air at 60.0 °C is 1650.0 mL.
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Bromophenol blue is another common acid-base indicator which changes color from yellow in acidic solution to blue in basic solution. The pH values for this indicator are in a range of approximately 3.0 to 4.6. Instead of using phenolphthalein in the CH3COOH-NaOH titration, if bromophenol blue was used, would the calculated molarity of acetic acid be higher, lower, or the same? Explain.
Answer:
It would be higher
Explanation:
If bromophenol blue was used instead of phenolphthalein in the CH3COOH-NaOH titration, the calculated molarity of acetic acid would be higher. This is because the pH range for bromophenol blue is lower than that of phenolphthalein (approximately 3.0 to 4.6 compared to 8.2 to 10.0). Therefore, the endpoint of the titration (where the indicator changes color) would occur at a lower pH for bromophenol blue, indicating that more NaOH has been added to neutralize the acetic acid. This would result in a higher calculated molarity of acetic acid.
A percent composition analysis yields 52.1% carbon, 13.2% hydrogen, and 34.7% oxygen. What is the empirical formula for the compound?
O:C:H ratio is 34.8/16/52.2/12/13/0/1 = 2.17/4.35/13/0 = 1:2/6. Hence, C2H6O is the empirical formula (option D).
What purposes does hydrogen serve?Fuel cells may produce heat and energy from hydrogen. Although transportation and utilities are expanding businesses, fertilizer manufacturing and petroleum refining still use hydrogen most frequently today.
Can hydrogen be burned as fuel?According to the 1992 Energy Policy Act, hydrogen qualifies as an alternative fuel. The ability of hydrogen to power fuel cell technology in zero-emission vehicles, the potential for home consumption, and the high efficiency and quick filling time of fuel cells all contribute to the interest in hydrogen as such an alternative transportation fuel.
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When a protonated epoxide is attacked by water, the nucleophile attacks from the ___________ in an __________ process.
When a protonated epoxide is attacked by water, the nucleophile attacks from the "top" or "front" of the epoxide ring in an "S_N2" substitution nucleophilic bimolecular process.
What is protonated epoxide ?
A protonated epoxide is a molecule that contains an epoxide ring (a three-membered ring consisting of two carbon atoms and one oxygen atom) that has been protonated, or had a hydrogen ion (H+) added to it.
The protonation of an epoxide ring can occur in the presence of an acidic medium, such as a strong acid like sulfuric acid (H2SO4) or hydrochloric acid (HCl).
In acidic conditions, the lone pair of electrons on the oxygen atom of the epoxide ring can interact with the positively charged hydrogen ion, resulting in the formation of a protonated epoxide.
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Convert 675000 to scientific notation
Answer:
To convert 675000 to scientific notation, we need to express it in the form a × 10^n, where a is a number between 1 and 10 (but not 10 itself), and n is an integer.
Starting with 675000, we can divide by 10 repeatedly until we get a number between 1 and 10.
675000 ÷ 10 = 67500 (one division by 10)
67500 ÷ 10 = 6750 (two divisions by 10)
6750 ÷ 10 = 675 (three divisions by 10)
Now we have a number between 1 and 10 (namely, 6.75), and we know that we divided by 10 three times, so the exponent is -3.
Therefore, we can express 675000 in scientific notation as:
6.75 × 10^5
(Note that we could also express it as 6.75 × 10^2 × 10^3, but this is not in standard scientific notation, which requires the coefficient to be between 1 and 10.)
What is another example, in real life, where we can prove that gases exist even though we can not see them? Explain why you believe this is a good example.
Well, us human being rely on [tex]o_{2}[/tex] (oxygen). We human beings breathe this in every day because we need it to survive. This is a good example because it explains how humans don't see [tex]o_{2}[/tex] but use it every day.
How many milliliters of 9.89 M nitric acid solution should be used to prepare 3.50 L of 0.200 m HNO3? _____mL
Answer: Therefore, 70.7 mL of 9.89 M nitric acid solution should be used to prepare 3.50 L of 0.200 M HNO3.
Explanation:
To prepare 3.50 L of 0.200 M HNO3, we need to calculate the amount of HNO3 required and then determine the volume of 9.89 M nitric acid solution needed to prepare this amount of HNO3.
The amount of HNO3 required can be calculated using the formula:
amount of HNO3 (in moles) = volume of solution (in liters) x concentration of HNO3 (in moles per liter)
Substituting the given values:
amount of HNO3 = 3.50 L x 0.200 mol/L = 0.700 mol
Now, we can use the amount of HNO3 and the concentration of the nitric acid solution to calculate the volume of the nitric acid solution needed:
volume of nitric acid solution = amount of HNO3 (in moles) / concentration of nitric acid solution (in moles per liter)
Substituting the given values:
volume of nitric acid solution = 0.700 mol / 9.89 mol/L = 0.0707 L
Finally, we can convert the volume to milliliters:
volume of nitric acid solution = 0.0707 L x 1000 mL/L = 70.7 mL
Therefore, 70.7 mL of 9.89 M nitric acid solution should be used to prepare 3.50 L of 0.200 M HNO3.
Regenerate response
What do the dark areas in the large cells
represent? Explain your reasoning.
Answer:I think your talking about the chromatin
Explanation: There dark
For the following chemical reaction:
In the laboratory, a chemist mixed aqueous barium chloride with aqueous potassium oxide which produced solid barium oxide and aqueous potassium chloride
A. Write the complete balanced chemical equation, including phase labels.
B. Identify the type of reaction that has occurred.
C. Identify the indicator that tells you a chemical reaction has occurred.
A. The balanced chemical equation with phase labels is: BaCl2 (aq) + K2O (aq) → BaO (s) + 2KCl (aq)
B. This is a double displacement or metathesis reaction, as the cations and anions of the reactants switch places to form new compounds.
C. The indicator that a chemical reaction has occurred is the formation of a solid (BaO) and the disappearance of the reactants (BaCl2 and K2O) as they react to form products (BaO and KCl).
What is balanced chemical equation?A balanced chemical equation is a representation of a chemical reaction using chemical formulas of the reactants and products, and coefficients to indicate the relative numbers of each.
The coefficients are used to balance the equation such that the number of atoms of each element in the reactants is equal to the number of atoms of the same element in the products.
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Mass of 8.46x10^24 atoms of fluorine is 266.95g.calculate the atomic mass of fluorine
Answer:
The atomic mass of fluorine is 18.9984 g/mol.
Explanation:
1. Calculate the number of moles of fluorine:Mass of 8.46x10^24 atoms of fluorine = 266.95gOne mole of fluorine contains 6.022x10^23 atoms. Therefore, the number of moles of fluorine = 8.46x10^24 / 6.022x10^23 = 14.05 moles
2. Calculate the atomic mass of fluorine:Atomic mass of fluorine = mass of one mole of fluorine= 266.95g/14.05 mol= 18.9984 g/mol Therefore, the atomic mass of fluorine is 18.9984 g/mol.
How many significant figures are in 6.07×10^14
Answer:3
Explanation: counting from left to right there is 3 sig figs.
42 grams of nitrogen gas react with
13 grams of hydrogen gas. What is the
limiting reactant and how many grams of
ammonia will be produced?
N2 + 3H22NH3
A) H2; 74 grams NH3 produced
B) H2; 4.3 grams NH3 produced
C) N2; 3.0 grams NH3 produced
D) N2; 51 grams NH3 produced
Answer:
d
Explanation:
Nitrogen is the limiting reactant.
42 g N2x (1mole N2/28 g N2) X (2 moles NH3/ 1mole N2) X (17 grams NH3/1mole NH3) = 51 g
13 g H2 x (1 mole H2/2 g H2) X (2 moles NH3/3moles H2) X (17 g NH3/1mole NH3) =73.66g
since 51 is smaller than 73.66 and it started with N2 that is why N2 is the limiting reactant)
The Kp for the reaction A (g) ⇌ 2 B (g) is 0.0110. What is Kp for the reaction 2 B (g) ⇌ A (g)?
The pressure of a gas will ? when the volume is decreased and will ? when the absolute temperature is decreased.
Answer:
Explanation:
Pressure and volume are indirectly related.
Pressure and temperature are directly related.
so first ? is increase
2nd ? is decrease