The sample density is 690 kg/m³.
We need to know about the density to solve this problem. Density is a unit that measures how dense an object is. Density can be measured by dividing mass by volume. It can be written as
ρ = m / V
where ρ is density, m is mass and V is volume
From the question above, we know that
m = 1.20 gram
V = 1.73 cm³
By substituting the following parameters, we get
ρ = m / V
ρ = 1.2 / 1.73
ρ = 0.69 g/cm³
Convert to SI unit (kg/m³)
ρ = 0.69 g/cm³
ρ = 0.69 x 10¯³ kg/ 10¯⁶ m³
ρ = 690 kg/m³
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C3H8(g) + 5O2(g) --> 3CO2(g) + 4H2O(g) + 2043.9 kJ
If 512 g of propane are burned in an automobile engine, the amount of energy released (to the nearest tenth) is __________ MJ.
The amount of energy released (to the nearest tenth) is 23.8 MJ
Balanced equationC₃H₈ + 5O₂ --> 3CO₂ + 4H₂O ΔH = 2043.9 KJ
Molar mass of C₃H₈ = (3 × 12) + (8 × 1) = 36 + 8 = 44 g/mol
Mass of C₃H₈ from the balanced equation = 1 × 44 = 44 g
Thus, we can say that:
From the balanced equation above,
44 g of propane were burned to release 2043.9 KJ of energy
How to determine the energy released by burning 512 g of propaneFrom the balanced equation above,
44 g of propane were burned to release 2043.9 KJ
Therefore,
512 g of propane will burn to release = (512 g × 2043.9 KJ) 44 g = 23783.56 KJ = 23783.56 / 1000 = 23.8 MJ of energy
Thus, 23.8 MJ of energy were released from the reaction
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The first-order decomposition of n2o5 at 328 k has a rate constant of 1. 70 × 10-3 s-1. If the initial concentration of n2o5 is 2. 88 m, what is the concentration of n2o5 after 12. 5 minutes?.
Using the first-order decomposition rate constant, the concentration of [tex]N_2O_5[/tex] after 12.5 minutes is found to be 0.805M.
The concentration of just one reactant determines the outcome of a first-order decomposition process. Even if additional reactants are present, the rate is unaffected by their concentration.
Given:
Rate constant of first-order decomposition, k = 1.70 x [tex]10^-^3 s^-^1[/tex]
Initial concentration of [tex]N_2O_5[/tex] = 2.88 M
Time, t = 12.5 min = 750 s
To Find:
Final concentration of [tex]N_2O_5[/tex] = ?
Formula:
By using the Rate law,
-d[A] / dt = k[A]
Calculations:
ln[[tex]N_2O_5[/tex]]t = - kt + ln[[tex]N_2O_5[/tex]]
= - (1.70 x [tex]10^-^3 s^-^1[/tex]) x 750s + ln2.88
= - 1.275 + 1.058
= - 0.217
[tex]e^\(ln[N_2O_5]t[/tex] = [tex]e^\-0.217[/tex]
= 0.805M
Therefore, the concentration of [tex]N_2O_5[/tex] after 12.5 minutes is 0.805 M.
Result:
The concentration of [tex]N_2O_5[/tex] after 12.5 minutes of reaction is found to be 0.805M
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HELP ASAP PLEASE!! GIVING BRAINLIEST!!
1. What information can the atomic emission spectra of a distant star yield for scientists?
A. chemical composition of the star
B. age of the star
C. number of electrons in the star
D. distance to the star
Explanation:
distance of the star ....
Answer:
number of electrons in the star
what’s the main difference between BaBr2 and SO2??
If 0.86 mole of mno 2 and 48.2 g of hcl react, how many grams of h20 will be produced?
11.8 grams of H₂O will be produced.
Balanced chemical equation:
MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O
n(MnO₂) = 0.86 mol; amount of manganese(IV) oxide
m(HCl) = 48.2 g; mass of hydrochloric acid
n(HCl) = 48.2 g ÷ 36.5 g/mol
n(HCl) = 1.32 mol; amount of the acid
From balanced chemical equation: n(MnO₂) : n(HCl) = 1 : 4
Hydrochloric acid is limited reactant.
From balanced equation: n(HCl) : n(H₂O) = 2 : 1
n(H₂O) = 1.32 mol ÷ 2
n(H₂O) = 0.66 mol; amount of the water
m(H₂O) = n(H₂O) × M(H₂O)
m(H₂O) = 0.66 mol × 18 g/mol
m(H₂O) = 11.8 g; mass of the water
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HELP PLEASE ! Where do oil and natural gas come from? Make sure to include information about
the rock cycle, the history of life on Earth, fossils, and how fossils form.
Points !!!!!!!!!!!!
Answer:
Point A, Point B, and Point C
Explanation:
Collinear points means that they share the same line. Points A, B, and C all share the line m.
What three quantities/variables are needed in order to calculate the amount of heat (q) given off or absorbed during a chemical reaction?
Three quantities/variables are needed in order to calculate the amount of heat given off or absorbed during a chemical reaction are the substance, the process and the amount of substance.
When a substance in the same state absorbs heat, its temperature increases.
The amount of heat absorbed is proportional to the amount of the substance and the increase in temperature.
The amount of heat needed to raise the temperature of one gram of substance by 1°C is called the specific heat of that substance.
The specific heat of water is 4.18 J/g°C.
The amount of heat, q, absorbed by a given mass (m) of substance with specific heat, s, when its temperature increases by ΔT is given by the following formula: q = m × s × ΔT.
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PLEASE ANSWER FAST I REALLY NEED IT!!! 50 POINTS
Explain how the properties of matter can be used to explain substances? Describe at minimum of five properties using complete sentences.
Answer: All matter has physical and chemical properties. Physical properties are characteristics that scientists can measure without changing the composition of the sample under study, such as mass, color, and volume (the amount of space occupied by a sample). Chemical properties describe the characteristic ability of a substance to react to form new substances; they include its flammability and susceptibility to corrosion. All samples of a pure substance have the same chemical and physical properties. For example, pure copper is always a reddish-brown solid (a physical property) and always dissolves in dilute nitric acid to produce a blue solution and a brown gas (a chemical property).
Physical properties can be extensive or intensive. Extensive properties vary with the amount of the substance and include mass, weight, and volume. Intensive properties, in contrast, do not depend on the amount of the substance; they include color, melting point, boiling point, electrical conductivity, and physical state at a given temperature. For example, elemental sulfur is a yellow crystalline solid that does not conduct electricity and has a melting point of 115.2 °C, no matter what amount is examined (Figure 1.3.1). Scientists commonly measure intensive properties to determine a substance’s identity, whereas extensive properties convey information about the amount of the substance in a sample.
All matter has physical and chemical properties. Physical properties are characteristics that scientists can measure without changing the composition of the sample under study, such as mass, color, and volume (the amount of space occupied by a sample). Chemical properties describe the characteristic ability of a substance to react to form new substances; they include its flammability and susceptibility to corrosion. All samples of a pure substance have the same chemical and physical properties. For example, pure copper is always a reddish-brown solid (a physical property) and always dissolves in dilute nitric acid to produce a blue solution and a brown gas (a chemical property).
Physical properties can be extensive or intensive. Extensive properties vary with the amount of the substance and include mass, weight, and volume. Intensive properties, in contrast, do not depend on the amount of the substance; they include color, melting point, boiling point, electrical conductivity, and physical state at a given temperature. For example, elemental sulfur is a yellow crystalline solid that does not conduct electricity and has a melting point of 115.2 °C, no matter what amount is examined (Figure 1.3.1). Scientists commonly measure intensive properties to determine a substance’s identity, whereas extensive properties convey information about the amount of the substance in a sample.
Explanation: Read the article and simplify it in your own words.
All but one of the halides will produce a precipitate with _____________.
a) chlorine
b) sodium
c) silver
d) nitrate
e) ammonium
f) hydroxide
All but one of the halides will produce a precipitate with Silver.
What are Halides?In chemistry, a halide (rarely halogenide) is a binary chemical compound made of two elements or radicals, one of which is an atom of a halogen and the other of which is an element or radical that is less electronegative (or more electropositive) than the halogen. These elements or radicals can be combined to form a fluoride, chloride, bromide, iodide, astatide, or theoretically a Tennessee compound. Under the right circumstances, the alkali metals immediately react with halogens to generate halides with the general formula MX (X = F, Cl, Br, or I). The hal- syllable in halide and halite reflects the fact that many salts are halides. At room temperature, all Group 1 metals produce halides, which are white solids.To learn more about Halides, refer to:
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The _______ law of thermodynamics states that energy conversions result in energy lost in a nonuseful form like heat.
The second law of thermodynamics states that energy conversions result in energy lost in a nonuseful form like heat.
The second law of thermodynamics states that although heat can do work, it is not always possible to convert heat completely into other types of energy, because in an energy conversion process an amount of energy is useful and other one is not useful due to the fact that it cannot be transformed.
In general terms, the second law of thermodynamics speaks of the efficiency in the processes of energy conversion and entropy in systems.
What is entropy?Entropy is defined as the degree or amount of disorder or randomness of a system.
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what are 3 main ways thermal energy can be transfered
Thermal energy transfers occur in three ways: through conduction, convection, and radiation. When thermal energy is transferred between neighboring molecules that are in contact with one another, this is called conduction.
The chemical formula:N2 would represent what type of substance
Answer:
it would represent sodium
Write the chemical symbols for three different atomic cations that all have 22 protons.
Three different atomic cations that have 22 protons-
Cr2+Mn3+Fe4+Atomic cations are atoms that have a positive electric charge.
(Chromium) Cr has 24 protons therefore, Cr2+ has = 24 - 2 ⇒ 22 protons.
(Manganese) Mn has 25 protons therefore, Mn3+ has= 25-3 ⇒ 22 protons.
(Iron) Fe has 26 protons therefore, Fe4+ has= 26-4 ⇒ 22 protons.
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Cr²⁺, Mn³⁺ and Fe ⁴⁺ are the chemical symbols for three atomic cations with 22 electrons.
The number of protons inside the nucleus always remains constant.
∴Chemical symbol of three different atomic cation that have 22 electrons-
1. Cr²⁺
2.Mn³⁺
3. Fe⁴⁺
Atomic cation is the ion with positive electric charge on it, it means it should have more protons than electrons.
•Chromium (Cr) has 24 electrons therefore, Cr²⁺ will have = 24- 2 ⇒22 electrons (+2 charge means it will lose 1 electron from its outer shell)
•Manganese (Mn) has 25 electrons therefore, Mn³⁺ will have = 25-3⇒ 22 electrons. (+3 charge means it will lose 3 electrons from its outer shell)
•Iron (Fe) has 26 electrons therefore, Fe⁴⁺ will have = 26-4 ⇒ 22 electrons. (+4 charge means it will lose 3 electrons from its outer shell)
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Your question is incorrect. It should be - Write the chemical symbols for three different atomic cations that all have 22 electrons.
What+were+the+bid+price+(in+$),+asked+price+(in+$),+and+yield+to+maturity+on+a+$1000+par+value+6.25%+may+2030+bond?+what+was+its+(asked)+price+(in+$)+on+the+previous+day?
Its asked price in$ on the previous day is the bid price is the sum a dealer offers to buy a bond at.
What is bid price?A bid price is the sum that a buyer is prepared to pay for a contract, commodity, asset, security, or other item, among other things. It is called a "bid" in many marketplaces and locations.
The "ask" price, which is the amount that sellers are willing to accept an offer, is often reduced by a bid. The bid-ask spread is the difference between the two prices.
Market makers may submit bids on securities on an ongoing basis or in response to a seller's request for a price at which they can sell. Unsolicited bids are those made by a bidder when a seller isn't actively trying to sell, which occasionally happens.
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For unrestrained cube made from linear, isotropic, homogeneous material the temperature increase causes strain in_____ direction(s).
For unrestrained cube made from linear, isotropic, homogeneous material the temperature increase causes strain in (6,0) direction(s).
It is well known that for unrestrained cube made from linear, isotropic, homogeneous material the temperature increase causes strain in (6,0) direction(s). This is due to the fact that the cube is free to expand in all directions, and thus, the strain is evenly distributed throughout the cube. However, it is interesting to note that the strain in the (6,0) direction is actually slightly greater than in the other directions. This is because the (6,0) direction is the direction of the temperature gradient, and thus, the strain is greater in this direction.
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A cubic box has a side length of 5 cm. The mass of the box is 250 g. What is the density? HINT: You were not
given the volume of the box, only the side length).
Answer:
Explanation:
bdbdh
how many helium atoms have the same mass as 1 sulfur
Solid kcn is added to a solution of 0.10 m ag and 0.10 m zn 2 until a precipitate forms. which will precipitate first?
AgCN will precipitate first.
Precipitation in chemistry is the formation of an insoluble chemical by the reaction of two salts or through temperature changes that affect the solubility of the compound. Additionally, the solid that results from a precipitation reaction is referred to as "precipitate."
Precipitation can be a sign that a chemical reaction has taken place, but it can also happen when the concentration of a solute is higher than its solubility. The process of small, insoluble particles aggregating with one another or forming an interface with a surface, such as a container wall or a seed crystal, is the precursor to precipitation and is known as nucleation.
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You are given two metal cubes that look similar. One has an edge of 3. 2 cm long and a mass of 43. 63 g. The other has an edge of 8. 34 cm long and a mass of 683. 5 g. How can you determine if both cubes are made from the same material? select the true statements.
By solving for the density of the two metal cubes, we can determine if both cubes are made from the same material.
Density, denoted by ρ, is a property of any substance that is defined as the ratio between the mass and volume of the substance.
ρ = m/v
where ρ = density
m = mass
v = volume
Solving the density of each cube.
Cube 1 :
ρ = m/v
ρ = m/e^3
ρ = 43. 63 g/(3. 2 cm)^3
ρ = 1.3315 g/cm^3
Cube 2 :
ρ = m/v
ρ = m/e^3
ρ = 683. 5 g/(8. 34 cm)^3
ρ = 1.1783 g/cm^3
If two objects have the same density, then they are made from the same material. Since the density of the two cubes are not equal, then they are not made form the same material.
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What levels of protein structure would be affected if all hydrogen bonding interactions were prevented?.
The levels of protein structure would be affected if all hydrogen bonding interactions were prevented are primary, secondary, tertiary, and quarternary structures.
There are 4 levels of protein structures:
Primary structures: Protein primary structure is the linear sequence of amino acids in a peptide or protein.
secondary structures: Protein secondary structure is the three-dimensional form of local segments of proteins.
tertiary structures: Protein tertiary structure is due to interactions between R groups in the protein.
quarternary structures: Protein quaternary structure is the fourth classification level of protein structure.
The levels of protein structure would be affected if all hydrogen bonding interactions were prevented are primary, secondary, tertiary, and quarternary structures.
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90. A piece of wood sinks in ethanol but floats in
gasoline. Give a range of possible densities for
the wood. Refer to Table 3.6 on page 90.
in order for the wooden to waft in fuel, it needs to have a density much less than the density of fuel and so as for it to sink in ethanol, it must have a greater density than the density of ethanol however ethanol is denser than gasoline therefore if it sinks in ethanol it has to also sink in fuel.
If the wood pressure is much less than the object's weight, the object will sink. So, the piece of timber floats in water whilst located in ethanol it sinks. ethanol is lighter than water so it needs to drift to the floor of the water but this isn't always the actual case. The ethanol in water neither sinks nor floats, alternatively it mixes thoroughly to form a homogenous solution. The purpose of this blending of two solutions is hydrogen bonding between ethanol and water.
Density is a measure of how heavy something is compared to its size. If an item is greater dense than water it will sink while placed in water, and if it's miles much less dense than water it'll float. Density is a functioning asset of a substance and doesn't depend on the amount of substance.
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What is the relationship between the following two compounds?
a. constitutional isomers
b. stereoisomers
c. identical
d. not isomers; different compounds entirely
These are stereoisomers so option b.
constitutional isomers are structural isomers who have specific type of isomers that share the same molecular formula but different bonding structure and patterns. To identify a constitutional isomer the easy way is to count the number of carbon and the degree.
Isomers that have same composition but have different orientation in space is known as stereoisomers. it is of two types diastereomers and enantiomers.
the non-superimposable mirror images are formed by enantiomers.
diastereomers are not mirror images but they are non-superimposable
Here in this figure the given are stereoisomers and it is diastereomer.
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this question was incomplete and there was no figure. i gave attached a fig accordingly answered the question.
Identification of the mistake. of the nucleotides in the gene were changed as indicated in the mistake sequence, what type of mutation would this be? explain.
A silent mutation occurs as there is no change according to the blast alignment of the query and subject sequences.
Both the subject sequence's site 1557 and the query sequence's site 1557 are ‘A’. The double-stranded DNA sequence seen above is the sense (+) strand of the pmoc gene, which is predicted to encode pmoc. On translation of the silent mutation gene, the amino acid sequence for the gene is same - glutamine leucine threonine arginine proline arginine proline threonine glutamine alanine valine glycine alanine.
The protein product is unaffected by silent mutations. A nucleotide change still might code for the exact same amino acid as though it had not undergone mutation. The phenotype of both structure and function is maintained when amino acids are constant.
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How many protons, neutrons, and electrons are there if iron has an atomic number of 26, a mass number of 56, and a charge of +2?
The number of protons in an isotope atom does not change but the number of neutrons does. The iron atom has about twenty-eight isotopes. Such as 45Fe, 46Fe, 47Fe, 48Fe, 49Fe, 50Fe, 51Fe, 52Fe, 53Fe, 54Fe, 55Fe, 56Fe, 57Fe, 58Fe, 59Fe, 60Fe, 61Fe, 62Fe, 63Fe, 64Fe, 65Fe, 66Fe, 67Fe, 68Fe, 69Fe, 70Fe, 71Fe and 72Fe.
Among the isotopes, 54Fe (Observationally Stable), 56Fe, 57Fe, and 58Fe are stable and formed naturally. The remaining isotopes of iron are highly unstable and their half-lives are very short.
Isotope Mass number (A) Atomic number (Z) Neutron number = A – Z
45Fe 45.01458 26 19
46Fe 46.00081 26 20
47Fe 46.99289 26 21
48Fe 47.98050 26 22
49Fe 48.97361 26 23
50Fe 49.96299 26 24
51Fe 50.956820 26 25
52Fe 51.948114 26 26
53Fe 52.9453079 26 27
54Fe 53.9396090 26 28
55Fe 54.9382934 26 29
56Fe 55.9349363 26 30
57Fe 56.9353928 26 31
58Fe 57.9332744 26 32
59Fe 58.9348755 26 33
60Fe 59.934072 26 34
61Fe 60.936745 26 35
62Fe 61.936767 26 36
63Fe 62.94037 26 37
64Fe 63.9412 26 38
65Fe 64.94538 26 39
66Fe 65.94678 26 40
67Fe 66.95095 26 41
68Fe 67.95370 26 42
69Fe 68.95878 26 43
70Fe 69.96146 26 44
71Fe 70.96672 26 45
71Fe 71.96962 26 46
Answer:
Protons: 26
Neutrons: 30
Electrons: 24
Explanation:
4) What is the density of a metal block that has a mass of 270 grams and has a length of 5 cm, width of 3
cm, and a height of 2 cm
Answer:
P=9
Explanation:
Formula: P = M/V
First, we need to find the volume. This can be done by: 5 x 3 x 2 which will give us 30
Now we can plug it in
P= 270/30
P=9!
What do we call the one variable that we change in an experiment?
*
What determines whether a carbon atom's covalent bonds to other atoms are in a tetrahedral configuration or a planar configuration?
The presence or absence of double bonds between the carbon atom and other atoms determines whether a carbon atom's covalent bonds to other atoms are in a tetrahedral configuration or a planar configuration.
The condition of electronic configuration is the one that determines the kinds as well as the number of bonds that a carbon atom will form with other atoms. When two carbon atoms are bonded by a double bond, the particular atom which is joined to the carbon exists in the same plane as the place of carbons. The organic molecules called hydrocarbons consists of only hydrogen and carbon.
Because reason of having four electrons by carbon in its valence shell, it is capable of forming four covalent bonds with that of other atoms. Whenever carbon forms four bonds with other atoms, the resulting molecule thus formed has a shape of tetrahedral. Generally, there are three basic types of covalent bonds which include single bonds, double bonds as well as triple bonds.
A carbon atom's covalent bonds to other atoms are in a planar configuration with the presence or absence of double bonds.
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A calorimeter initially contains 175.0 ml of water at 23.6oc. when 1.23 g na is added to the water, the temperature of the resulting solution rises to a maximum of 44.9oc. the reaction that occurs is:_________
A calorimeter initially contains 175.0 ml of water at 23.6oc. when 1.23 g Na is added to the water, the temperature of the resulting solution rises to a maximum of 44.9oc. the reaction that occurs is-2Na(s)+H2O(l)→2NaOH(aq)+H2(g).
A calorimeter is a tool used in the process of calorimetry, which determines heat capacity and measures the heat produced by chemical reactions or other types of physical changes. Differential scanning calorimeters, isothermal micro calorimeters, titration calorimeters, and accelerated rate calorimeters are a few of the most common types.
Simply put, a simple calorimeter is a metal container with a thermometer placed above a combustion chamber. It is one of the measurement instruments used in the research of chemistry, biochemistry, and thermodynamics.
The enthalpy change per mole of a material A in a reaction between two substances A and B is calculated by adding the components separately to a calorimeter and recording the beginning and final temperatures.
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Assuming the sun's energy is radiated uniformly in all directions, calcualte the total power
Assuming the sun's energy is radiated uniformly in all directions, the total power is (π [tex]r . ^{2}[/tex] * σ[tex]R^{2} T^{4}[/tex])/[tex]r^{2}[/tex]
According to Stefan's law, if the sun were a perfect blackbody, its energy output per second would be:
P=σA[tex]T^{4\left \ }[/tex]
(Where P is energy radiated per second and A is the area of the sun.)
⇒P=σ×4π[tex]R^{2} T^{4}[/tex].............(1)
Assuming r>>r., the strength of this power at the earth's surface is
I= P/4π[tex]r^{2}[/tex]
⇒I= σ×4π[tex]R^{2} T^{4}[/tex]/4π[tex]r^{2}[/tex]
(Inserting the value obtained from equation (1))
⇒I= σ[tex]R^{2} T^{2}[/tex]/[tex]r^{2}[/tex]
Due to its great distance from the sun, the earth only receives a small portion of the energy that is radiated. The earth can be visualized as a little disc with a radius equal to that of the planet.
The disc's surface area is [tex]r .^{2}[/tex] hence the earth's total radiant energy as received is:
PE=π[tex]r. ^{2}[/tex]×I
P E = (π [tex]r . ^{2}[/tex] * σ[tex]R^{2} T^{4}[/tex])/[tex]r^{2}[/tex]
Assuming the sun's energy is radiated uniformly in all directions, the total power is (π [tex]r . ^{2}[/tex] * σ[tex]R^{2} T^{4}[/tex])/[tex]r^{2}[/tex]
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