Answer:
It is a network solid, a lattice of many covalent bonds (like diamond, except that it is black rather than transparent).
Explanation:
Answer:
Network Solid
Explanation:
what are the products of the combustion of a hydrocarbon
Answer:
Carbon dioxide, water, and heat.
Explanation:
Hydrocarbon combustion refers to the type of reaction where a hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat. Hydrocarbons are molecules consisting of both hydrogen and carbon. They are most famous for being the primary constituent of fossil fuels, namely natural gas, petroleum, and coal.
Answer:
carbon dioxide, water vapor, and heat
HELPPPPPPPPPPPPPPPPPPPP MEEEEEEEEEEEEEEEE PLZZZZZ WITHHHHH SCIENCE 13. Evaluate: What type of bonding does a material most likely have if it has a high melting point, is solid at room temperature, and easily dissolves in water?
14. Explain the following statement: All compounds are substances, but not all substances are compounds.
15. Suppose you have a found an unknown substance in a laboratory. It has the formula H2O2 written on the bottle. Is it water? How do you know?
13 An Ionic Bond
these are the characteristics of an ionic bond compounds like NaCl have these characteristics
14 substances could be compounds or elements hence not all substances are compounds
15 It is not water. The chemical composition of water is H2O not H202
(H202 is hydrogen peroxide and is toxic)
How long have people studied chemistry?
A. Since chemicals were discovered
B.Since fire was discovered
C.Since the atom was discovered
D.Since gravity was discovered
Since fire was discovered have people studied chemistry
Chemistry is a science that is dedicated to the study of the following topics:
The structure of matterThe properties of matterThe composition of matterThe transformation of matterIt is one of the oldest sciences in the world because it is considered that it began with the first individuals who manipulated and discovered fire.
Over time it has evolved and many scientists have found different important knowledge such as the states of matter, the chemical elements of the earth, radioactivity, chemical reactions between elements and other knowledge.
According to the above, the correct answer is C. because it mentions the event considered as the beginning of the study of chemistry.
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Answer:
since was fire was discovered
Explanation:
2. Which change occurs when N3+ is changed to an N atom?
Three neutrons are lost.
Three electrons are lost.
Three protons are gained.
ons
Three electrons are gained.
ons
A meteorologist wants to create a visual aid different gases in earths atmosphere which type of chart or graph would best convey the data
Answer:
A pie chart
Explanation:
A pie chart would be the ideal type of chart to create this visual aid. A pie chart is simpler visually and easily understood. It can show data as portions or percentages of a whole. Since what they want is to present the different gases found in Earth's atmosphere, they can show what percentage of the different gases make up the atmosphere.
It is simpler because the size of each portion or "slice" of the pie chart itself can reveal a lot about the data without even reading the numbers.
Answer:
Pie chart
Explanation:
Compound which posses same molecular formula but differ in each other in the structure of carbon chain is ?
Answer:
Two or more compounds are called structural isomers if they possess the same molecular formula but different structural formulas.
Explanation:
The molecular formula of a compound shows the number of atoms of each element in a single molecule. In addition to showing the number of atoms, the structural formula of a molecule shows how the atoms are arranged in that molecule.Two compounds are considered structural isomers if their molecular formulas are the same while they differ in their structural formulas.
For example, the molecular formula [tex]\mathrm{C_4H_{10}}[/tex] represents both butane and methylpropane. However, the two compounds differ in their structural formula. (See the structural formulas in the diagram attached.)
Butane is a straight-chain alkane, whereasMethylpropane is branched.Due to the difference in the structures of structural isomers, there's a good chance that they will show different chemical and physical properties. For example, the melting point of butane is higher than that of methylpropane. The straight-chain shape of butane allows its molecules to be stacked close to each other. That allows for greater intermolecular forces and, therefore, a higher melting point.
A nanotechnology equipment requires 7.40 x 10^18 atoms of potassium. What is the mass of this sample?
Answer:
4.81×10⁻⁴ g K
Explanation:
Convert atoms to moles:
7.40×10¹⁸ atoms K × (1 mol K / 6.02×10²³ atoms) = 1.23×10⁻⁵ mol K
Convert moles to mass:
1.23×10⁻⁵ mol K × (39.1 g K / mol K) = 4.81×10⁻⁴ g K
How are precipitation and temperature different between the polar and tropical climate zones? Explain.
Answer:
Earth has tremendous diversity of its ecosystems. Different regions are referred to as climate biomes to understand patterns of weather, biology, and natural events.
Explanation:
The greatest difference between tropical and polar climates is the difference in temperature. Tropical climates are located near the Equator and receive more sun year-round than anywhere else on Earth, while polar climates are the farthest from the Equator and receive the least sunlight and heat of any part of the globe. This makes the winters of polar climates fierce and the summers short, while practically every day in a tropical climate is hot. While both climates might bring to mind precipitation (such as rain in the tropics and snow at the poles), both can also be quite dry. Antarctica is considered the largest desert in the world, since almost no snow falls toward the center of the continent. Tropical deserts, such as the Namib of Africa, are extremely hot and dry, making it difficult for any life to survive.
Answer: In the polar climate zone, it is very cold and dry, receiving less precipitation every year. The tropical climate zone has very warm and hot temperatures all year round, receiving much rain.
Explanation: I read the lesson and it makes sense
What is the correct way to write 1,550,000,000 in scientific notation?
1.55x 109
1.55 x 1010
15.5x 103
15.5x 10
Answer: a
Explanation:
scientific notation is about how many places passed the decimial place you are moving. therefor in order to get 1,550,000,000 you would move the decimial from 1.55 over nine times to the right
Answer: a.1.55x 109
Explanation:
In the study of Physics and Mathematics, sometimes we see very large or very small numbers. In both cases, the number of digits to write is very large. There is a simple and practical way of writing such numbers without having to write many zeros, this method is known as scientific notation. In the case we use a power of 10:
1,550,000,000 = 1.55x109
What is the molar mass of potassium oxide, K2O?
A. 47.0 g
B. 110.0 g
C. 94.0 g
D. 55.0 g
Answer:
The molar mass of potassium oxide, aka K20 would be option C. 94.0g
Explanation:
The molar mass of potassium oxide (K₂O) is 94.20 g/mol, matching option C (94.0 g).
To find the molar mass of potassium oxide (K₂O), we need to sum the molar masses of the constituent elements.
The atomic mass of Potassium (K) is 39.10 g/mol.Since there are 2 potassium atoms in K₂O, the total mass for potassium is 2 × 39.10 g/mol = 78.20 g/mol.The atomic mass of oxygen (O) is 16.00 g/mol. Summing these values yields: 78.20 g/mol + 16.00 g/mol = 94.20 g/mol.Therefore, the molar mass of potassium oxide (K₂O) is 94.20 g/mol, which is closest to option C (94.0 g).
if a gas has a volume of 2.60 L at a pressure of 1.60atm, what will its new volume be at a pressure of 10.6 atm
Answer:
0.39L
Explanation:
Given parameters:
Initial volume of gas V₁ = 2.6L
Initial pressure on gas P₁ = 1.6atm
Final volume of gas V₂ = ?
Final pressure on gas P₂ = 10.6atm
Solution
Applying Boyle's law which states that "the volume of a fixed mass of a gas varies inversely as the pressure changes if the temperature is constant".
Mathematically;
P₁V₁ = P₂V₂
V₂ = [tex]\frac{P_{1}V_{1} }{P_{2} }[/tex]
V₂ = [tex]\frac{1.6 x 2.6 }{10.6 }[/tex] = 0.39L
Calculate q, the heat released in each reaction.
Use the equation q = cmåt.
(Use c = 4.18 J/g.°C and the total mass, m.)
Record to 2 significant figures.
Reaction 1:
Reaction 2:
RETRY
Answer:
its write for the first person who did it
Explanation:
Answer:
Reaction 1: 3700
Reaction 2: 3200
pt 2
Reaction 1: 0.00823
Reaction 2: 0.00397
pt 3
reaction 1: -450
reaction2: -81
Explanation:
A sample of water with a mass of 123.00 kg is heated from 25 C to 97 C. If the specific heat of water is 1 J-1 kg K-1 then how much energy is required?
Answer:
8,860 J = 8.86 kJExplanation:
The heat energy required to heat a substance may be calculated from the formula:
Q = m × C × ΔTWhere:
m = mass of substance = 123.00 kg of waterC = specific heat = 1 J⁻¹ kg K⁻¹ΔT increase of temperature = 97°C - 25°C = 72°C = 72 K.Then, substitute the numbers in the formula to get:
Q = 123.00 kg × 1 J⁻¹ kg K⁻¹ × 72 K = 8,856 J ≈ 8,860 J or 8.86 kJwhat are the missing coefficents for the following equation? __N2+__H2->__NH3
3,1,2
1,3,2
1,1,2
1,3,3
Answer:
1, 3, 2
Explanation:
N2 + H2 → NH3
I usually find that the best way to systematically balance an equation by inspection is to start with the most complicated-looking formula and then balance atoms in the order:
All atoms other than O and H O H(a) The most complicated formula is NH3.
(b) Balance N.
We have 1 H in NH3, but 2 N on the left. We need 2 N on the right. Put a 1 in front of N2 and a 2 in front of NH3.
1N2 + H2 → 2NH3
(c) Balance H.
We have fixed 6 H on the right, so we need 6 H on the left. Put a 3 in front of H2.
1N2 + 3H2 → 2NH3
The equation is now balanced, and the coefficients are 1, 3, 2.
A sample of helium has a temperature of 450 K. The gas is cooled to 248.9 K at which time the gas occupies 103.4 L? Assume pressure is constant at 3 atm. What was the original volume of the gas
Answer:
[tex]\boxed{\text{163.3 L}}[/tex]
Explanation:
The pressure is constant, so, to calculate the volume, we can use Charles' Law:
\dfrac{V_{1}}{T_{1}} = \dfrac{V_{2}}{T_{2}}
Data:
V₁ = ?; T₁ = 450 K
V₂ = 103.4 L; T₂ = 284.9 K
Calculation:
[tex]\dfrac{ V_{1}}{450} = \dfrac{ 103.4}{284.9}\\\\{ V_{1}} = 450 \times \dfrac{103.4}{284.9}\\\\ = \textbf{163.3 L}\\\text{The original volume of the helium was $\boxed{\textbf{163.3 L}}$}[/tex]
The original volume of the gas is 186.94 Liters
Further Explanation;
Charles' Law Charles's law states that the volume of a fixed mass of a gas is directly proportional to absolute temperature at constant pressure.That is;[tex]V\alpha T[/tex]
[tex]P=kT[/tex], where k is a constant
At different temperatures and pressure then;
[tex]\frac{V_{1} }{T_{1} } =\frac{V_{2} }{T_{2} }[/tex]
In the Question;
We are given
[tex]V_{1} = ?\\T_{1} = 450\\V_{2} = 103.4 l\\T_{2} =248.9K[/tex]
Therefore;
[tex]V_{1} =\frac{V_{2} T_{1} }{T_{2} }[/tex]
[tex]V_{1} =\frac{(103.4 L)(450 K)}{(248.9K)}[/tex]
[tex]V_{1} = 186.94Liters[/tex]
Other Gas laws Boyle's law Boyle's law states that the volume of a fixed mass of a gas is inversely proportional to its pressure at a constant temperature.That is;
[tex]P\alpha \frac{1}{V}[/tex]
[tex]P\alpha \frac{k}{V}[/tex], where k is a constant
Combined gas lawCombined gas law combines both Boyle's law and Charles's law.It states that the volume of a fixed mass of a gas is directly proportional to absolute temperature and inversely proportional to pressure.That is;[tex]\frac{P_{1}V_{1} }{T_{1} } = \frac{P_{2}V_{2} }{T_{2} }[/tex]
Pressure LawPressure Law states that the pressure occupied by a gas is directly proportional to absolute temperature.
Keywords: Combined gas laws, Boyle's law and Charles's law
Learn more about:Boyles’s law: brainly.com/question/1158880Gay-Lussac’s law: brainly.com/question/2438000Charles’s law:brainly.com/question/2438000Combined gas law: brainly.com/question/2441061Level: High school
Subject: Chemistry
Topic: Gas laws
Sub-topic: Charles's law
Why does magnesium oxide have a high melting point?
Please give as much information as possible?
Magnesium oxide is an ionic compound ( because it consists of a metal and a non-metal)
In ionic compounds, electrons from the outer shell exchange between the atoms so that they each get a full outer shell. Once these electrons are exchange, the atoms will become ions. One ion will have a positive charge, and the other ion will have a negative charge. The positive and negative ions then bond strongly together in a lattice structure, due to the electrostatic forces of attraction.
These electrostatic forces of attraction are very strong and require a lot of energy to break, as such the compound will have a high melting point.
__________________________________________
Now lets look at the ionic bonding between magnesium and oxygen:
In the outer shell of Magnesium, there are 2 electrons.
In the outer shell Oxygen, there are 6 electrons.
Magnesium gives it's two electrons to Oxygen, so that the Oxygen now has a full outer shell of 8 electrons. However, since Oxygen gained two electrons, it will form a negatively charged ion with a charge of -2.
Since Magnesium lost the two electrons, it's second shell (which has 8 eletrons) now becomes the outer shell. So Magnesium also now has a full outer shell. But since it has lost two electrons, it becomes a positively charged ion with a charge of + 2.
The positive Magnesium ion and negative Oxygen ion and now strongly attracted to each other, and form a strong ionic compound (magnesium oxide) with a lattice structure.
The electrostatic forces of attraction between the positive Magnesium and negative Oxygen are so strong that a lot of heat and energy are needed to break them.
Therefore magnesium oxide has a high melting point.
Which of these is a property of a substance that is composed of atoms that are held together by ionic bonds
Answer:
It conducts electricity when it is dissolved in water.
Explanation:
It conducts electricity when it is dissolved in water is a property of a substance that is composed of atoms that are held together by ionic bonds.
The property of a substance that is composed of atoms that are held together by ionic bonds. As soon as it is dissolved in water, it conducts electricity.
What are ionic bonds?Ionic bonds are defined as the type of chemical compound connection created by the electrostatic attraction of ions with opposing charges. Ionic bonds are important because they enable the production of particular organic molecules, ionic bonds are significant.
A material's electrical conductivity, or capacity to carry a current, is a measure of how much electrical current it can carry. While electrical conductance is a characteristic of a specific electrical component, electrical conductivity is a quality of the substance itself. How much voltage is needed to for a certain quantity of electric current to flow can be used to determine electrical conductivity.
Thus the property of a substance that is composed of atoms that are held together by ionic bonds. As soon as it is dissolved in water, it conducts electricity.
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What is the classification for this reaction?
SO 3 + H20 - H250 4
How many moles of Fe304 are required to supply enough iron to prepare 0.171 mol Fe203?
Answer:
0.114 moles
Explanation:
Calculate available moles of Fe:
0.171 mol Fe₂O₃ × (2 mol Fe / mol Fe₂O₃) = 0.342 mol Fe
Now calculate moles of Fe₃O₄ needed:
0.342 mol Fe × (1 mol Fe₃O₄ / 3 mol Fe) = 0.114 mol Fe₃O₄
Insecticides help humans compete with insects for a resource. Which resource is most likely to be preserved for humans through the use of insecticides?
Answer:
The correct answer would be Food.
The ideal gas constant, R has several different values that could be used. Which quantity causes these differences?
pressure
temperature
volume
moles
Mark this and return
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Answer:
[tex]\boxed{\text{Pressure and volume}}[/tex]
Explanation:
The measure of R is always the same, but the numbers may differ depending on the units you use.
For example, in SI units, R = 8.314 Pa·m³K⁻¹mol
If your measurement uses different units, you must either convert your units to SI or use a value of R consistent with your units.
If you use bars and litres, R = 0.083 14 bar·L·K⁻¹mol⁻¹.
If you use kilopascals and litres, R = 8.314 kPa·L·K⁻¹mol
If you use atmospheres and litres, R = 0.082 06 L·atm·K⁻¹mol⁻¹.
If you use Torr and cubic centimetres, R = 62 368 Torr·cm³ K⁻¹mol⁻¹.
The only units that don't change are "K⁻¹mol⁻¹".
[tex]\text{The quantities that affect the value of R are }\boxed{\textbf{pressure and volume}}[/tex]
Which substance is less soluble in hot water than in cold water?
A KBr
B NaNO3
C CO2
D Naci
Answer:
CO2
Explanation:
it is a gas and solubable in colder weather/temperature
The solubility of CO2 is lesser at higher temperature than it is at a lower temprature.
Solubility of a gasThe solubility of a gas in water is an exothermic process. This implies that the higher the temperature, the lower the solubility of the gas.
As such, we know that CO2 is the only gas in the list hence the solubility of CO2 is lesser at higher temperature than it is at a lower temprature.
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AgNO3(aq)+Na3PO4(aq) ionic equation
Answer:
3Ag⁺ + 3NO₃⁻ + 3Na⁺ + PO₄³⁻ → Ag₃PO₄(s) + 3Na⁺ + 3NO₃⁻
Explanation:
An ionic equation is a chemical equation where the electrolytes in aqueous solution are expressed as dissociated ions.
For the reaction:
3AgNO₃(aq) + Na₃PO₄(aq) → Ag₃PO₄(s) + 3 NaNO₃(aq)
AgNO₃(aq), Na₃PO₄(aq) and NaNO₃(aq) are dissociated in water thus:
AgNO₃(aq) → Ag⁺ + NO₃⁻
Na₃PO₄(aq) → 3Na⁺ + PO₄³⁻
NaNO₃(aq) → Na⁺ + NO₃⁻
The ionic equation is:
3Ag⁺ + 3NO₃⁻ + 3Na⁺ + PO₄³⁻ → Ag₃PO₄(s) + 3Na⁺ + 3NO₃⁻
I hope it helps!
5. Assuming the temperature is held constant, how could you increase the pressure inside a
container by a factor of 37
Answer:
Decrease the volume or increase the number of moles by a factor of 37.
Explanation:
If the contents are a gas,
pV = nRT
If T is constant
[tex]p \propto \dfrac{n}{V}[/tex]
There are two ways to increase the pressure inside the container.
1. Decrease the volume
If you decrease the volume by a factor of 37, the pressure will increase by the same factor.
2 Increase the number of moles
If you add 36 times the number of moles, you will have 37n moles. Increasing the amount of gas by a factor of 37 increases the pressure by the same factor.
To increase the pressure inside a container by a factor of 37 while keeping the temperature constant, the volume of the gas must be reduced to 1/37th of its original volume, as per Boyle's Law, which states that pressure and volume are inversely proportional.
Assuming the temperature is held constant, to increase the pressure inside a container by a factor of 37, you must reduce the volume of the gas. This is based on Boyle's Law, which states that, for a given mass of gas at constant temperature, the pressure of the gas is inversely proportional to its volume. This means if you want to increase the pressure inside the container, you have to decrease the volume of the container correspondingly.
For instance, if the original pressure of the gas is P, and the volume is V, to increase the pressure by a factor of 37 (making it 37P), you would need to reduce the original volume (V) to V/37. This is because P1*V1 = P2*V2, where P1 and V1 are the initial conditions and P2 and V2 are the final conditions, assuming no change in the amount or temperature of the gas.
How did Bohr propose the particles within atom are arranged
A. Protons and electrons form the nucleus with neutrons orbiting it
B. Protons make up the atoms nucleus with electrons and neurons orbiting it
C. Protons and neutrons from the nucleus of the atom with electrons orbiting it
D. Neutrons make up the atoms nucleus with electrons and protons orbiting it
Answer:
Protons and neutrons form the nucleus of the atom with electrons orbiting it.- C.
The correct answer is C. Protons and neutrons form the nucleus of the atom with electrons orbiting it
Explanation:
Bohr model was proposed by Niels Bohr in 1913 to explain the structure of atoms, in this Bohr stated electrons (particles negatively charge) orbit the nucleus that contains both neutrons (neutral particles) and protons (positively charged particles). Additionally, according to this model electrons were placed in different levels of energy and orbit the nucleus constantly, resembling planets in the Solar System, although the Bohr model was the first one that integrated principles related to energy levels and changes in energy in electrons. Thus, Bohr proposed "Protons and neutrons form the nucleus of the atom with electrons orbiting it".
how many moles of O2 are counsumed if 20 moles of SO2 are Produce
Answer:
20 moles of O₂ are consumed when 20 moles pf SO₂ are produced.Explanation:
1) Balanced chemical equation:
S + O₂ → SO₂2) Mole ratios:
1 mol S : 1 mol O₂ : 1 mol SO₂3) Proportion:
1 mol SO₂ / 1 mol O₂ = 20 mol SO₂ / x4) Solve for x:
x = 20 mol SO₂ × 1 mol O₂ / 1 mol SO₂ = 20 mol O₂.Answer: 20 moles of O₂ are consumed when 20 moles pf SO₂ are produced.
Answer:
Explanation:
25
what are the two products in complete combustion reactions?
Answer:
Carbon dioxide and water i believe. Possibly carbon monoxide.
Explanation:
The two products in the combustion reaction of hydrocarbon or fuel are carbon dioxide and water.
What are the combustion reactions?Combustion reactions involve the oxidation of the hydrocarbon such reactions commonly liberate large amounts of energy with carbon dioxide and water as products.
A hydrocarbon undergoes combustion to form carbon dioxide and small amounts of water but no side products are left behind in the combustion reaction.
Combustion reactions are exothermic redox reactions and usually oxidized fuel. This is often referred to as smoke. The combustion reactions are accompanied by flames but not all combustion reactions result in fires.
The combustion reactions of methane are also known to yield water and carbon dioxide. This chemical reaction can be represented by the chemical equation as follows:
CH₄ + 2O₂ → 2 H₂O + CO₂
The explosion of fireworks is also a combustion reaction as well as a redox reaction, specific ions are present in the fuel to emit a color to the flame.
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How can one tell how much of each reactant will be used in a reaction?
A. The coefficients tell the ratio of grams of reactants used in the reaction
B. The molar masses of the molecules tell how many moles of each reactant are used
C. The molar masses of the molecules tell how many grams of each reactant are used
D. The coefficients tell the ratio of moles of reactants used in the reaction
Answer:
D. The coefficients tell the ratio of moles of reactants used in the reaction
Explanation:
The molar ratio is central to all stoichiometric calculations.
To get the mass of Compound B that reacts with compound A, you must
Convert the mass of A to moles Use the molar ratio from the balanced equation to find the moles of B Convert moles of B to grams.You must get over the "mole hill."
2.00 L of nitrogen gas at a temperature of 210 K are cooled down until the new volume is 1.25 L. If the pressure and number of gas particles do not change, to what temperature was the gas cooled?
131 K
1.19 x 10-2 K
7.62 x 10-3 K
336 K
Please answer ASAP!!
Answer:
131 K
Explanation:
The only variables are volume and temperature, so we can use Charles' Law:
V1/T1 = V2/T2
Data:
V1 = 2.00 L; T1 = 210 K
V2 = 1.25 L; T2 = ?
Calculation:
2.00/210 = 1.25/T2
Multiply each side by the lowest common denominator (210T2)
2.00T2 = 1.25 ×210
2.00T2 = 262.5
T2 = 262.5/2.00 = 131 K
The gas was cooled to 131 K.
Classify each of the following chemical reactions.
S+02 → SOZ
CaCl2 + 2AgNO3 → Ca(NO3)2 + 2AgC1
Zn+CuSO4 → Cu+ ZnSO4
2Na2O → 4Na+02
The chemical reaction has been the formation of product with the reaction of reactants. The chemical reaction has been differentiated as synthesis, decomposition, replacement reaction.
Types of Chemical reactionThe following reaction has been classified as:
[tex]\rm S+O_2\;\rightarrow SO_2[/tex]The reaction has been following the synthesis of the product with a mixture of reactants. Thus, it has been given as the synthesis reaction.
[tex]\rm CaCl_2+2\;AgNO_3\;\rightarrow Ca(NO_3)_2\;+\;2\;AgCl[/tex]There has been replacement of Ca by Ag in calcium chloride and replacement of Ag by Ca in silver nitrate. There has been two replacement. Thus, the reaction has been a double replacement reaction.
[tex]\rm Zn\;+\;CuSO_4\;\rightarrow\;Cu\;+\;ZnSO_4[/tex]The reaction has replacement of Cu by Zn in copper sulfate. It has been a single replacement, thus the reaction has been a single replacement reaction.
[tex]\rm 2\;Na_2O\;\rightarrow\;4\;Na\;+\;O_2[/tex]There has breakdown of the compound for the formation of product. Thus, the reaction has been a decomposition reaction.
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Answer:
synthesis and combustion
double replacement
single replacement
decomposition only
Explanation:
in that order, i got it correct