In Lei's experiment, one step of the procedure requires her to bring some water to a boil. Lei should use OC.a Bunsen burner and a balance.
Because it can operate with a variety of gases, has a single flame, and allows for adjustable heat output, the Bunsen burner is crucial in laboratories. Scientists utilize a variety of beakers in the lab. Scientists mix and track the responses of various compounds within them.
The following are three general safety guidelines when using a Bunsen burner: Never leave the lab with the burner on and never leave open flames unattended. Once the gas has been used up, turn it off. Before handling the burner, allow it to cool. Before leaving the lab, make sure the main gas valve is closed.
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A+75%+antifreeze+solution+is+to+be+mixed+with+a+90%+antifreeze+solution+to+get+360+liters+of+a+85%+solution.+how+many+liters+of+the+75%+and+how+many+liters+of+the+90%+solutions+will+be+used?
240L of 90% solution is used to make solution.
Let, the quantity of 75% antifreeze solution be x and 90% antifreeze solution be y.
360 is the total quantity of the mixture
x + y = 360 (1)
Also the final solution is 85% solution
75 % of x + 90% of y = 85% of 360
0.75x + 0.90y = 0.85 × 360
0.75x + 0.90y = 306
75x + 90y = 30600 (2)
by solving equation 1 and 2 we get
15y = 3600
y = 240
Therefore, 240L of 90% solution is used to make solution.
Any material that lowers water's freezing point is an antifreeze, and it works to prevent ice from forming and shield systems from its negative consequences. Radiators in car cooling systems are protected by antifreezes, including ethylene glycol or propylene glycol, which are frequently added to water.
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Answer:
240L of 90% solution is used to make solution.
Let, the quantity of 75% antifreeze solution be x and
90% antifreeze solution be y.
360 is the total quantity of the mixture
x + y = 360
(1)
Also the final solution is 85% solution
75% of x + 90% of y = 85% of 360
0.75x + 0.90y = 0.85 × 360
0.75x + 0.90y=306
75x + 90y = 30600
(2)
by solving equation 1 and 2 we get
15y = 3600
y=240
Therefore, 240L of 90% solution is used to make
solution.
antifreeze, and it works to prevent ice from forming
Any material that lowers water's freezing point is an and shield systems from its negative consequences. Radiators in car cooling systems are protected by antifreezes, including ethylene glycol or propylene glycol, which are frequently added to water.
What+is+the+molar+fraction+of+25%+w/w+acetic+acid+solution?+(density+=+1.05kg/l,+mw+=+60
The molar fraction of 25% w/w acetic acid solution is 4.375 M.
What is a molar fraction?The mole fraction, commonly known as the molar fraction (xi or I is a unit of measure for the amount of a constituent (represented in moles), ni, divided by the sum of all constituent amounts in the mixture (also stated in moles, ntot).
The Mole Fraction is the product of the molecular weight of one component divided by the molecular weight of the entire combination. When two components with reactive natures are combined, it is quite helpful.
The unit of molar fraction is Moles/liter.
Density of solution = 1.05 kg/L
= 1.05 g/ml
The molar fraction is
M = 25 × 1.05 × 10/60
= 4.375 M
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An acidic solution has a ph value of _______, a neutral solution has a ph value of _______, and a basic (alkaline) solution has a ph value of _______.
An acidic solution has a ph value of 0 - 6, a neutral solution has a ph value of 7, and a basic (alkaline) solution has a ph value of 8 - 14.
According to Arrhenius, an acid is a substance that releases hydroxonium ion (H3O+) as its only positive ion when dissolved in water. In other words, they are proton donors. They also turn litmus paper red, have a wet feeling and a sour taste.
A base is a substance that releases hydroxide ion (OH-) as its only negative ion when dissolved in water, according to Arrhenius. They are proton acceptors and turn litmus paper blue. They have a slippery feeling and a bitter taste.
To determine whether a solution is acidic or basic, ph indicators like litmus paper, phenolphthalein and methyl orange are used, but they do not give an exact ph value. To specifically know how acidic or basic a solution is, the ph scale is used. It comprises of a range of numbers from 0 - 14, with 0 being the most acidic and 14 being the most basic. Neutral substances like water have ph value of 7. Acidic solutions have a ph range from 0 - 6, while basic solutions have ph values from 8 - 14.
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3.00g of Cacl^2 is dissolved in 100.0mL of Water. What is the mass percentage of Cl- in the solution?Use the filling values to calculate: MM of Ca = 40.078 g/mol MM of Cl = 35.45 g/mol Density of Water: 1.00g/mL
The mass percentage of Cl⁻ in the solution produced when 3.00g of CaCl₂ is dissolved in 100.0mL of water is 1.86 %.
What is the total mass of the given solution?The total mass of the solution which is produced when 3.00g of CaCl₂ is dissolved in 100.0mL of water is determined as follows:
mass of CaCl₂ = 3.0 g
mass of water = density * volume
mass of water = 1.00 g/mL * 100.0 mL
mass of water = 100.0 g
mass of solution = (100.0 + 3.0) g
total mass of solution = 103.0 g
molar mass of CaCl₂ = (40 + 35.5 * 2) g/mol
molar mass of CaCl₂ = 111 g/mol
mass percentage of Cl⁻ in CaCl₂ = 71/111
mass of Cl⁻ present in 3.0 g of CaCl₂ = 71/111 * 3 = 1.92 g
mass percentage of Cl⁻ in the solution = 1.92/103 * 100%
mass percentage of Cl⁻ in the solution = 1.86 %
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substances are either elements or mixture
true
false
Answer:
False
Explanation:
Substances are of two types: Pure substances and mixtures. Pure substances include elements (made up of single kind of atoms), compounds (atoms of different element in fixed proportion). Substances are of three types: elements, compounds and mixtures.
Which are the initial main products of reaction of benzyl isopropyl ether (phch2och(me)2) in concentrated hydriodic acid (hi)?
Initial main byproducts of the reaction between concentrated hydro iodic acid and benzyl isopropyl ether are isopropyl alcohol and benzyliodide.
What are ethers?
Any organic compound in the family known as ethers has an oxygen atom bound to two alkyl or aryl groups. Ethers and alcohols share structural similarities, and water shares structural similarities with both ethers and alcohols. While both hydrogen atoms are replaced by alkyl or aryl groups in an ether, just one hydrogen atom of a water molecule is replaced by an alkyl group in an alcohol.
The initial stage in the hydrophilic acid cleavage of ethers will be a pre-equilibrium protonation of the ether's oxygen.The resonance-stabilized benzyl cranium ion and isopropyl alcohol will then be produced when the powerful nucleophile iodide ion displaces isopropyl alcohol from the main group.It is feasible for the hydroid acid and isopropyl alcohol to react further to produce the specified isopropyl iodide.Thus, Initial main byproducts of the reaction between concentrated hydro iodic acid and benzyl isopropyl ether are isopropyl alcohol and benzyliodide.
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In a water molecule, why are the electrons more highly attracted to and spend more time around the oxygen atom, giving it a partially negative charge?.
Answer:
Oxygen has more protons than hydrogen and water's shared electrons are drawn to it.
Explanation:
choose:
1) Positive ion of metal .... active than its atom.
a/ more
b/ less
c/ equally
d/ none is correct
and please tell me why.
Answer:
It is more active
Explanation:
This atom attracts all the elecrons of the atom forming energy levels in form of orbits
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P2O5 was found to have a ph of 2.0 . Give reasons for this observation
It is because the traditional definition of a strong acid is based on the simplicity of proton (hydrogen ion) donation in aqueous solution.
Which acid is formed by P2O5?The chemical compound phosphorus pentoxide has the molecular formula P4O10 (with its common name derived from its empirical formula, P2O5). The anhydride of phosphoric acid is this white, crystalline solid. When P2O5 is dissolved in water, it produces H3PO4, or phosphoric acid (3H2O + P2O5 2H3PO4).
Why is it called P2O5 as diphosphorus pentoxide?Phosphorus pentoxide has a molecular formula of P4O10, but its empirical formula is P2O5. But the name of the compound, not its molecular formula, was derived from its empirical formula. The official name for all of this substance is diphosphorus pentoxide.
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Sometimes when performing a crystallization, one solvent alone will not work and you have to use a solvent-pair. Will the solvent pair hexane and diethyl ether work? why or why not?.
Answer:
k
Explanation:
k7
Mixtures:
(A) Have specific compositions
(B) do not have specific compositions
(C) are made from liquids
(D) are made from one substance
The true statement about mixtures is that they do not have specific compositions (option B).
What is a mixture?Mixture is a substance made up of two or more chemical components that are not chemically linked.
This further means that the constituents of a mixture maintain or keep their individual chemical identities because there is no breaking of bonds.
As opposed to mixtures, compounds are made up of constituents that are chemically bonded to one another, hence, possess a definite composition.
Examples of mixtures are as follows:
Sugar and waterSalt and waterAir (mixture of gases)Salt and sugarSand and waterOil and waterTherefore, the true statement about mixtures is that they do not have specific compositions.
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How much more average Kinetic Energy do molecules have at 50°C compared to 25°C?
The kinetic energy is 0.5177 × 10⁻²¹ J more at 50°C compared to 25°C.
The average kinetic energy of a molecule is directly proportional to the absolute temperature of a gas.
KE = ( 3/2 ) ( R / Nₐ ) T
Where T is the temperature of the molecule, R is the gas constant, and Nₐ is Avogadro's number.
Now, R = 8.314 J/mol.K
Avogadro's number, Nₐ = 6.022 × 10²³ atoms/ mol
The average kinetic energy at 50° C is:
T = 50° C = 323 K
KE₁ = ( 3/2 ) × ( R / Nₐ ) × T₁
KE₁ = ( 3 × 8.314 × 323 ) / ( 2 × 6.022 × 10²³ )
KE₁ = 668.90 × 10⁻²³ J
KE₁ = 6.6890 × 10⁻²¹ J
The average kinetic energy at 25°C is:
KE₂ = ( 3/2 ) × ( R / Nₐ ) × T₂
KE₂ = ( 3 × 8.314 × 298 ) / ( 2 × 6.022 × 10²³ )
KE₂ = 617.13 × 10⁻²³ J
KE₂ = 6.1713 × 10⁻²¹ J
Now,
The average kinetic energy of the molecules at 50° C compared to 25° C is:
KE = KE₁ - KE₂
KE = 6.6890 × 10⁻²¹ - 6.1713 × 10⁻²¹
KE = 0.5177 × 10⁻²¹ J
Hence, the average kinetic energy is 0.5177 × 10⁻²¹ J more at 50° C compared to 25° C.
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calculate the relative molecular mass of sodium trioxonitrate (V) NaNO3 [Na = 23,O=16,Ca= 40, H=1,N= 14]
The relative molecular mass of sodium trioxonitrate, NaNO₃ is 85 g/mol.
What is molecular mass?The molecular mass of a substance is the sum of all atomic masses of all atoms in a molecule. It is measured in Dalton.
The compound is NaNO₃ and the atomic mass of all atoms are given below:
Atomic Mass of sodium (Na) = 23 g
Atomic Mass of nitrogen (N) = 14 g
Atomic Mass of oxygen (O) = 16 g
Now add the atomic masses of atoms of the molecules:
Molecular mass of = 23 +14 +16(3) = 85 g/mol.
Thus, the relative molecular mass of sodium trioxonitrate is 85 g/mol.
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How many grams of sodium iodide, nai, must be used to produce 95.6 g of iodine, i2?
95.6g I2 is produced by 2*150*95.6/254 g NaI = 112.91g of NaI.(sodium iodide)
What is sodium iodide?
A metal iodide salt with a Na (+) counterion is sodium iodide. It is an iodide salt and an inorganic sodium salt. A water-soluble ionic compound having a crystal lattice is sodium iodide. Although it can be used as a supplement for complete parenteral nutrition, sodium iodide is more frequently applied in veterinary medicine.
2*150 grams of Sodium Iodide NaI must be used to produce 254 g of Iodine I₂
For the formation of Iodine from NaI , the reaction is the follows:
2NaI(aq) + Cl₂ → I₂ + 2 NaCl
To calculate how many grams of NaI are needed to produce 95.6 g of Iodine, we use a conversion factor to go backward from grams of iodine to grams of sodium iodide.
Thus, 254g I2 is produced by 2*150 g NaI
95.6g I2 is produced by 2*150*95.6/254 g NaI = 112.91g of NaI.
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Which answer best describes the process for calculating the molarity of a solution where 4.8 g of nano2(aq) is dissolved in 150. ml of h2o(l)?
The process for calculating the molarity of a solution:
1) Calculate the number of moles of solute by multiplying mass of solute and the inverse of molar mass.
2) Calculate the molarity of the solution by multiplying number of moles of solute and the inverse of solution volume.
n(NaNO₂) = m(NaNO₂) × 1/M(NaNO₂); multiplying mass of solute and the inverse of molar mass.
n(NaNO₂) = 4.8 g ÷ 69 g/mol
n(NaNO₂) = 0.0695 mol; the number of moles of solute
c(NaNO₂) = n(NaNO₂) × 1/V(NaNO₂);
c(NaNO₂) = 0.0695 mol ÷ 0.150 l
c(NaNO₂) = 0.463 mol/l; the molarity of the solution
Missing options:
1) Calculate the number of moles of solute by multiplying number moles of solute/mass of solute and molar mass/the inverse of molar mass.
2) Calculate the molarity of the solution by multiplying molarity of solute/number of moles of solute and solution volume/the inverse of solution volume.
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An aqueous solution of isopropanol (mm = 60.10 g/mol) has a molality of 10.01 m and a density of 1.180 g/ml. what is the molarity of isopropanol in the solution?
Molarity of isopropanol in the solution is found to be 0.0196M
The concentration of the solute in a solution is its molarity. It also goes by the name "molar concentration." The moles of solute per litre of solution is measured as molarity. The letter M serves as its symbol.
The amount of moles of solute in a kilogram of solvent is known as molality. The letter m stands for it.
Given:
Molecular mass of isopropanol, mm = 60.10g/mol
Molality, m = 10.01m
Density, d = 1.180g/ml
To find:
Molarity, M = ?
Formula:
M = (m x d) / 1 + (m x mm)
Calculations:
M = (10.01 x 1.180) / 1 + (10.01 x 60.10)
M = 11.8118 / 602.601
M = 0.0196M
Result:
The molarity of isopropanol in the aqueous solution is found to be 0.0196M.
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Helpppppppppp!!! the law of conservation of mass states that during a chemical reaction, mass/matter is not __________________________ or ________________________. because of this law, there must be exactly the same number and kind of _____________________ on each side of a chemical equation. to check if an equation is balanced or not, simply count the number of atoms of each element on the reactant side of the equation and check to see if there are the same number of atoms of each element on the ______________________ side of the equation. if so, it is balanced.
Answer: created, destroyed, element, product
Explanation: The law of conservation of mass states that matter can neither be created nor destroyed but is transferred from one form to another. In other words, the mass of one element at the beginning of the reaction must be equal to the mass of the element at the end of the reaction.
So...the law of conservation of mass states that during a chemical reaction, mass/matter is not CREATED or DESTROYED and because of this law, there must be exactly the same number and kind of ELEMENTS on each side of a chemical equation.
To check if an equation is balanced or not, simply count the number of atoms of each element on the reactant side of the equation and check to see if there are the same number of atoms of each element on the PRODUCT side of the equation. If so, it is balanced.
A block of metal occupies a volume of 16.4 mL and has a mass of 59.6 grams. What is the density of the block?
Answer:
3.63 g/mL (3 s.f.)
Explanation:
Density is the amount of substance per unit volume, and can be calculated by dividing the mass by the volume.
Given: mass= 59.6 g, volume= 16.4 mL
Density of block
= 59.6 ÷16.4
= 3.63 g/mL (3 s.f.)
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Answer:
The density calculator will help you estimate the relationship between the weight and volume of an object.
Explanation:
which gas dissolves in water
Answer:
Oxygen and Carbon dioxide
8th grade science
Which statements describe kinetic and potential energy? CHECK ALL THAT APPLY.
O Energy can be stored in the position of an object.
O Energy is not present in a moving object.
O Energy can be stored in the position of the particles that make up a substance. O Energy exists as movement of the particles of a substance.
O Energy is greater in faster-moving particles than in slower-moving particles. O Energy is lower in objects with greater mass than in objects with less mass.
Answer:
A and D is what I got hopes this helps
An atom has an atomic number of 56. Answer the following questions about this element. What is the element's symbol? If it has a charge of 1+, how many electrons does it have? What is the name of the group, or family, is it in? PLS HELP ASAP
An barium, group 2A family atom has an atomic number of 56
Barium is a chemical element with the symbol Ba and atomic number 56 it is fifth element in group two and is a soft, silvery alkaline earth metal because of its high chemical reactivity, barium is never found in the nature as a free element, element symbol are Ba and when If it has a charge of 1+ then barium has 56 electron then 56-1=55 electron are present barium are present in group 2A in the periodic table and called alkaline earth metal
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How many moles are in 2.66 ml of isopentyl alcohol? (molar mass = 88.148 g/mol; density = 0.8104 g/ml)
Density = 0.8104 g/ml
⇒ mass/volume = 0.8104 g in 1ml volume.
Number of moles = Mass (g) / Molar mass (g/mol)
⇒ No. of moles =0.8104/88.148 = 9.1936 x 10^-3 mole in 1 ml volume
So, in 2.66 ml of isopentyl alcohol,
No. of moles = 2.66 x 9.1936 x 10^-3 = 24.454976 x 10^-3 mole
What is the Mole concept?The mole idea is a useful way to indicate how much of a substance there is. Any measurement can be divided into two components: the magnitude in numbers and the units in which the magnitude is expressed. The particles that are often counted are chemically identical but individually separate entities. The constituent particles of a solid, however, remain stable and bound in a lattice structure, albeit they may be separated without losing their chemical identity. The mole is nevertheless used to describe the number of atoms linked together rather than a count of molecules in other instances, such as diamond, where the entire crystal is effectively one single molecule.To learn more about the Mole concept, refer to:
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Structure is achieved when a protein folds into a compact, three-dimensional shape stabilized by interactions between side-chain r groups of amino acids.
Tertiary structure is achieved when a protein folds into a compact, three-dimensional shape stabilized by interactions between side-chain r groups of amino acids.
What is the structure of proteins?
A secondary amine (in proline), a molecule with the amino group (NH 2) attached to the alkyl side chain, and an amino acid with five carbon atoms (glutamic acid), are also found in proteins. Aspartic and glutamic acids both have two carboxyl groups (COOH), making them dicarboxylic acids.
When a protein folds into a small, three-dimensional shape that is stabilised by interactions between side-chain r groups of amino acids, this is known as tertiary structure.
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Inside of complex 1, fmnh2 transfers electrons to an fe/s complex. when this reaction occurs, ____. fmnh2 gets reduced. fe/s gets oxidized. fmnh2 gets oxidized. fadh2 gets reduced.
Inside of complex 1, fmnh2 transfers electrons to an fe/s complex. when this reaction occurs, FMNH, gets oxidized. So, the correct option is (c).
Either complex I or II is where electrons can enter the electron transport chain. The NADH, which is created in three processes of the citric acid cycle, is where these electrons originate from. As an illustration, consider the reaction in step 8 where NAD+ is reduced to NADH and L-malate is oxidized to oxaloacetate. Two hydrogen (H+) ions and two electrons are taken away from the substrate in the oxidation half-reaction.
The NAD+ molecule takes both of those electrons as well as one of the H+ ions during the reduction half-reaction. The inner mitochondrial membrane, the intermembrane space, and the other H+ ion are all traversed by the other H+ ion from the matrix. Through the matrix, NADH diffuses before being bound by complex I of the electron transport chain.
Complex I of the electron transport chain binds NADH as it diffuses across the matrix. The coenzyme flavin mononucleotide (FMN) in the complex takes both of NADH's electrons. By transferring the electrons, FMN is reduced to FMNH2 (reduced form of flavin) and NADH is oxidized back to NAD+.
Several proteins in Complex I have iron-sulfur (FeS) centers. These proteins are now receiving the electrons that were used to convert FMN to FMNH2.Two Fe-S centers are required to accept the two electrons required to regenerate FMN mononucleotide since each Fe-S center can only transmit one electron.
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What+is+the+molar+fraction+of+25%+w/w+acetic+acid+solution?+(density+=+1.05kg/l,+mw+=+60)
25% weight-to-weight acetic acid solution has a molar fraction of 4.375 M.
What is molar fraction?
The mole fraction is one of many ways to indicate the concentration of the solution. A mole fraction is a unit of concentration. The ratio of solute to solvent in a solution is measured using a unit called the mole fraction, which is symbolised by the letter "X."
X is a molar fraction representation. The mole fraction is defined as: moles of solute/total moles of solvent if the solution contains only components A and B. As a result, the mole fraction of each component added together is always equal to one.
The fact that the acetic acid is specified as 25% should be noted.
1.05 kg/L or 1.05 g/ml of solution density is equal to d.
Given the density, the molar fraction of a 25% weight-averaged acetic acid solution will be:
M = 25 × 1.05 × 10/60
= 4.375 M
Therefore, 4.375 M is the molar fraction of a 25% weight-to-weight acetic acid solution.
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Find out the solubility product of calcium sulfite ca(so3)2 if its solubility in water is found to be 1.18*10^-4m.
The equilibrium solubility of Ca (So3)2 is
Ca (So3)2 ⇋⇋ Ca2 + 2(SO3)
The Ksp (Solubility product) expression looks like this:
Ksp = [Ca2+] [SO3-]2
Ca (So3)2 generates 1 mol of Ca2+ whereas 2 mol of SO3– per mol.
[Ca2+] = 1.18*10^-4 M
[I–] = (2) × 1.18*10^-4 M
So, [I–] = 2.36 × 10^-4M
On Replacing these values in the Ksp equation.
Ksp = (1.18*10^-4M) (2.36 × 10^-4M)2
So, Ksp = 2.7848 x 10^-8 M2
What is a Solubility Product?The solubility product constant, abbreviated Ksp, is a condensed equilibrium constant that describes the equilibrium between a solid and its associated ions in a particular solution. Its value reveals how much a substance can dissociate in water. The substance is more soluble the higher the solubility product constant. The sum of the ion concentrations for a particular salt results in the Ksp expression. The saturated solutions of relatively low solubility ionic substances are described using the solubility product constants. The dissolved and dissociated ionic component and the undissolved solid are in a dynamic equilibrium state in a saturated solution.
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151 grams of SO2 is equal to how many moles
Answer:
151 g SO₂ × [1 mol SO₂/64.06 g SO₂] = 2.36 mol SO₂
Explanation:
Chemistry
Which molecule has 9 carbon atoms?
OA. Propane
OB. Cyclopentane
C. Cyclononane
O D. Butyne
Answer: C)
Explanation:
cyclononane
Dr. Johnson studies the physics of fireworks at the instant that they explode.
Which of the following technologies would be most useful in this research?
OA. microscope
OB. digital camera
OC. light detector
OD. video camera
Reset
Submi
Answer:video camera
Explanation:
I have an object with a mass of 14g and a volume of 2 mL. What is the density of the object?
7g/mL
Explanation:Density is a measure of mass per volume.
Density Formula
The density formula is [tex]\displaystyle D=\frac{m}{V}[/tex] where m is the mass in grams (g) and V is the volume in milliliters (mL). The way I learned the formula was that the m over the V looks like a heart when written out.
We can plug the mass and volume we were given to solve for density.
D = [tex]\frac{14g}{2mL}[/tex][tex]\frac{14}{2}[/tex] equals 7. So, the density must be 7 grams per milliliter (g/mL).
Density Units
The units for density are important. You will not get the correct answer if you do not include your units. There are multiple ways to express density, but it is most common to have g/mL.
Additionally, density should always have the volume measurement in the denominator. This means that density will never be written in mL/g.
