Which statement about Kepler's work is FALSE?
He proposed two laws of planetary motion
He used mathematics to support his work
He described that the orbits of planets are not perfect circles
He described that the Earth is not always the same distance from the sun
Answers
Related Questions
Equivalent weight of reducing agent
C2H2O4.2H2O + O= 2CO2 + 3H2O
Answers
Answer:
im too stoned for this
Explanation:
sorry man
A sample of water is heated from 10 °C to 50 °C using 286 J of energy. What is the mass of water that was heated? help
Answers
Answer:
Mass of water == 1.71 g
Explanation:
Given data:
Initial temperature of water = 10°C
Final temperature of water = 50°C
Energy absorbed = 286 J
Mass of water = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Specific heat capacity of water is 4.18 J/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 50°C - 10°C
ΔT = 40°C
by putting values,
286 J = m × 4.18 J/g.°C × 40°C
286 J = m × 167.2 J/g
m = 286 J / 167.2 J/g
m = 1.71 g
Write a balanced formula equation, complete ionic equation and net ionic equation for each of the following reactions
Answers
Answer: a)Complete ionic equation:
2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS
Net ionic equation:
Fe²⁺ + S²⁻ → FeS
b) Complete ionic equation:
2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃
Net ionic equation:
SO₃²⁻ + Ca²⁺ → CaSO₃
c) Complete ionic equation:
Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄
Net ionic equation:
Ba²⁺ + SO₄²⁻ → BaSO₄
Explanation:
(a) Balanced formula equation:
(NH₄)₂S + FeSO₄ → (NH₄)₂SO₄ + FeS
Complete ionic equation:
2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS
Net ionic equation:
Fe²⁺ + S²⁻ → FeS
(b) Balanced formula equation:
Na₂SO₃ + CaCl₂ → NaCl + CaSO₃
Complete ionic equation:
2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃
Net ionic equation:
SO₃²⁻ + Ca²⁺ → CaSO₃
(c) Balanced formula equation:
CuSO₄ + BaCl₂ → CuCl₂ + BaSO₄
Complete ionic equation:
Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄
Net ionic equation:
Ba²⁺ + SO₄²⁻ → BaSO₄
if a chemical reaction produces hydroxide ion, oh- , what would be the range for the target ph of a buffer solution that would favor ph stabilization under these conditions? explain your answer
Answers
The range for the target ph of a buffer solution that would favours ph stabilization unders this condition in (4.75-4.85).
What is Henderson Hasselback equation ?
The Henderson-Hasselbalch equation, pH = pKa + log([A]/[HA]), can be used to determine the pH of a buffer. The terms "HA" and "A" in this equation stand for the equilibrium concentrations of the conjugate acid-base pair that were employed to make the buffer solution.
What is acetate?
A proton is taken out of the carboxy group of acetic acid to produce acetate, a monocarboxylic acid anion. It performs a function as a Saccharomyces cerevisiae metabolite as well as a human metabolite. The base is a conjugate of an acetic acid. ChEBI. Alternatives to ACETIC ACID
The Henderson Hasselback equation for a suitable acetic acid / acetate buffer-
Ph= Pka + log (salt)/(acid)
(salt) = (acetate)
(acid) = (acetic acid)
now, CH3 COOH dissociates as
CH3COOH ⇔ CH3COOH +H
Pka for CH3COOH = 4.75
If a chemical reaction produced hydroxide ions, then CH3COOH gets consumed and more acetate ions with produces. This leads to change in Ph of the solution as due (CH3C00H-) increases the ph absence increases.
The range for the target ph of a buffer solution that would favours ph stabilization unders this condition in (4.75-4.85)
The buffer capacity is the ability of a given buffer to resist any changes in ph when small amount of acid or base added to it.The buffer capacity of a mixed weak acid( here Acetic acid)-base (NaOH) buffer is much greater when the individual pKa values are in close proximity with each other.
Therefore, The range for the target ph of a buffer solution that would favours ph stabilization unders this condition in (4.75-4.85).
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What is the gravitational potential energy of a box that is 2.9 m off the ground and a mass of 12.5 kg? * 20 points
Answers
Answer:
362,5J
Explanation:
formula for calculating Gravitational Potential Energy is mass×gravitational field strength ×height
12.5×10×2.9=362,5J
1. What is the net equation for the CNO cycle?
2. What is the net equation for the proton-proton chain?
Answers
The net equation for the CNO cycle is given below ,
he net equation for the proton-proton chain .
4 \(^{1} H^{+}\)+ 2 e- → \(^{4} He^{2+}\) + 2 ν
The early phase, also known as the "fast phase," the short phase, often known as the "supergiant phase," and the death phase, also known as the "supernova explosion," are the three main phases in the life of a star.
The Carbon-Nitrogen-Oxygen cycle, or CNO cycle, occurs throughout the main sequence phase.
In this stage, six distinct reactions occurring inside a star cause hydrogen to fuse into helium.
The carbon 12 isotope's nucleus releases gamma rays after engulfing a proton to create nitrogen-13 as the first stage in the chain.
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Draw the Lewis structure for acetamide, CH3CONH2. What are the electron-pair geometry and molecular geometry around the two C atoms? What is the hybridization of each of the C atoms? What orbitals overlap to form the σ and π bonds between carbon and oxygen?
Answers
Lewis structure for acetamide, CH3CONH2. four (4) are the electron-pair geometry and molecular geometry around the two C atom. Sp3d2 is the hybridization of each of the C atoms.
When the valence bond theory failed to accurately predict molecular structure, hybridization was used to explain it. Organic compounds' bond angles have been experimentally found to be near to 109o, 120o, or 180o. The Valence Shell Electron Pair Repulsion (VSEPR) theory states that because electron couples resist one another, the bonds and lone pairs surrounding a core atom are often spaced apart at their greatest angles. The behavior of electrons inside of molecules is modeled using orbitals. Since the hydrogen atom is the only neutral atom for which the Schrödinger equation can be precisely solved, this approximation for simple hybridization is based on atomic orbitals that are similar to those found for that atom. The 2s and 2p atomic orbitals, which are akin to the excited state orbitals for hydrogen, are utilised in heavier elements including carbon, nitrogen, and oxygen. It is believed that hybrid orbitals are combinations of atomic orbitals that are overlaid on one another in different ratios.
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a brass alloy contains 66.3% 66.3 % copper, cu, by mass with the remainder of the alloy being zinc, zn. determine the number of moles of zinc in 48.5 g 48.5 g of the brass alloy.
Answers
The number of moles of zinc in 48.5 g of brass alloy is 0.2518 mol, which was calculated by subtracting the mass of copper from the total mass of the alloy and dividing by the molar mass of zinc.
Molar mass of copper = 63.546 g/molMolar mass of zinc = 65.38 g/molMass of copper in 48.5 g of brass alloy = 48.5 g × (66.3/100) = 32.0265 gMass of zinc in 48.5 g of brass alloy = 48.5 g – 32.0265 g = 16.4735 gNumber of moles of zinc in 48.5 g of brass alloy = 16.4735 g / 65.38 g/mol = 0.2518 mol
The number of moles of zinc in 48.5 g of brass alloy is 0.2518 mol. This was determined by subtracting the mass of copper from the total mass of the alloy and dividing by the molar mass of zinc. This shows that there is a significant amount of zinc present in the alloy, which contributes to its strength and durability.
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Mercury is a convenient liquid to use in a barometer because:
Answers
Mercury is a convenient liquid to use in a barometer because of its high density and low vapor pressure.
Mercury is commonly used in barometers due to its unique properties that make it suitable for this purpose. Firstly, mercury has a high density, which means it is much denser than most other liquids. This property allows the mercury column in the barometer to be relatively short, making the instrument more compact and easier to handle.
Secondly, mercury has a low vapor pressure at room temperature. Vapor pressure refers to the tendency of a substance to evaporate into a gas. In the case of a barometer, it is important that the liquid in the column does not readily evaporate, as it would affect the accuracy of the pressure measurement. Mercury's low vapor pressure ensures that the liquid remains in its liquid state and does not significantly evaporate over time, providing stable and reliable measurements.
Additionally, mercury is highly sensitive to changes in atmospheric pressure, making it an effective medium for measuring and indicating variations in air pressure. The height of the mercury column in the barometer corresponds to the atmospheric pressure, allowing meteorologists and scientists to track changes in weather patterns and make accurate pressure measurements.
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What is a physical property?
O a characteristic of a substance that cannot be measured but can be observed
O a characteristic of a substance that can be measured or observed without changing the chemical identity of the substance
O a characteristic of a substance that cannot be measured or observed by conventional means
O a characteristic of a substance that can be measured or observed only by changing the chemical identity of the substance
Answers
Answer:
B. a characteristic of a substance that can be measured or observed without changing the chemical identity of the substance
Explanation:
The definition of a physical property is " a property (as color, hardness, boiling point) of matter not involving in its manifestation a chemical change."
The only choice that matches this description fully is the second one, or B, so that is the answer.
hope this helps!
50 point answer
A 25.0 g piece of brass at 325 °C
was placed into a sample of water.
The final temperature of the water and brass was 42.0 °C.
What is the heat, q, of the brass?
Answers
The heat of the brass is approximately -2702.75 J.
To calculate the heat (q) of the brass, we can use the equation:
q = m × c × ΔT
where q is the heat, m is the mass of the brass, c is the specific heat capacity of brass, and ΔT is the change in temperature.
First, we need to determine the specific heat capacity of brass. The specific heat capacity of brass varies depending on the composition of the brass, but we can use an approximate value of 0.38 J/g°C.
Given:
Mass of brass (m) = 25.0 g
Change in temperature (ΔT) = 42.0 °C - 325 °C = -283 °C
Now we can calculate the heat of the brass:
q = (25.0 g) × (0.38 J/g°C) × (-283 °C)
q = -2702.75 J
The negative sign indicates that heat is being transferred from the brass to the surroundings (water in this case). Therefore, the heat of the brass is approximately -2702.75 J.
It's important to note that the negative sign does not change the magnitude of the heat, it simply indicates the direction of heat flow. In this case, the brass is losing heat to the water, resulting in a decrease in its temperature and a corresponding increase in the temperature of the water.
So, the heat of the brass is -2702.75 J.
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Answer: -2688.5. I urge you to see what I have to say below, however, as it is very easy to understand how to do this once you get the simple equation down.
Explanation:
An easy way to get these answers down yourself without having to reach out for help is to do this equation:
Mass of the metal * Specific heat of the metal * (Final Temperature - Initial Temperature). Doing that got me the answer.
In this case, 25*0.380*(42-325) will get you the answer, 25 being the mass, 0.380 being the specific heat of the brass, and 42-325 being the final temperature of 42 degrees celsius minus the initial temperature of 325 degrees celsius. Hope this helped so you can do your best in the future.
40. 0% carbon, 6. 7% hydrogen, and 53. 3% oxygen with a molecular mass of 60. 0 g/mol. What is the molecular formula of the unknown compound?
Answers
The molecular formula of the unknown compound is C2H2O2.
To determine the molecular formula of the unknown compound, we need to calculate the empirical formula first and then find the multiple of its subscripts to obtain the molecular formula.
Given:
Percentage of carbon = 40.0%
Percentage of hydrogen = 6.7%
Percentage of oxygen = 53.3%
Molecular mass = 60.0 g/mol
Step 1: Convert the percentages to grams.
Assuming we have 100 grams of the compound:
Mass of carbon = 40.0 g
Mass of hydrogen = 6.7 g
Mass of oxygen = 53.3 g
Step 2: Convert the masses to moles using the molar masses of the elements.
Molar mass of carbon = 12.01 g/mol
Molar mass of hydrogen = 1.008 g/mol
Molar mass of oxygen = 16.00 g/mol
Number of moles of carbon = Mass of carbon / Molar mass of carbon
= 40.0 g / 12.01 g/mol
= 3.332 mol
Number of moles of hydrogen = Mass of hydrogen / Molar mass of hydrogen
= 6.7 g / 1.008 g/mol
= 6.648 mol
Number of moles of oxygen = Mass of oxygen / Molar mass of oxygen
= 53.3 g / 16.00 g/mol
= 3.331 mol
Step 3: Determine the empirical formula by dividing the moles by the smallest value.
Dividing the moles of carbon, hydrogen, and oxygen by 3.331 gives approximately 1 for each element.
So, the empirical formula of the compound is CHO.
Step 4: Determine the multiple of the subscripts to obtain the molecular formula.
To find the multiple, we divide the molecular mass by the empirical formula mass.
Molecular mass = 60.0 g/mol
Empirical formula mass = (12.01 g/mol) + (1.008 g/mol) + (16.00 g/mol) = 29.018 g/mol
Multiple = Molecular mass / Empirical formula mass
= 60.0 g/mol / 29.018 g/mol
= 2.07
Rounding to the nearest whole number, we get 2.
Therefore, the molecular formula of the unknown compound is C2H2O2.
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in the process of baking a cake, the recipe calls for 4 eggs 3 cups of flour 5 teaspoons of baking powder 1/3 pound of butter and 1.5 cups of sugar a baker has the following available 6 dozen eggs 48 cups of flour 45 teaspoons of baking powder 9 pounds of butter and 30 cups of sugar which is the limiting reactant in this process
Answers
Answer: Baking powder
Explanation: 45/5=9 cakeworth’s and the other reactants allow more than 9.
Answer:
Baking Powder
Explanation:
Convert miles per hour to meters per second. Round the answer to the nearest whole number.
65 miles per hour
meters per second.
Answers
Answer: 29 meters per second
Explanation:
65 mph=
65*1609.34 meters per hour=104607 meters per hour
1 hour=60 minutes
1 minute=60 seconds.
1 hour=60*60 seconds
1 hour=3600 seconds.
65 mph=104607/3600 meters per second
65 mph=29.0575 meters per second
29.0575 meters per second ==>29 meters per second
there are two different compounds of phosphorus and fluorine. in pf6 , the mass of fluorine per gram of phosphorus is 4.86 g f/g p . in the other compound, pfx , the mass of fluorine per gram of phosphorus is 2.43 g f/g p . what is the value of x for the second compound?
Answers
The question is about two different compounds of phosphorus and fluorine. In the compound PF6, the mass of fluorine per gram of phosphorus is 4.86 g f/g p. Therefore, the value of x for the second compound is 6.
In the second compound, PFX, the mass of fluorine per gram of phosphorus is 2.43 g f/g p, and we need to find the value of X for this compound. We have to assume that the mass of phosphorus in both compounds is the same. Let's calculate the molar mass of PF6 and PFX:PF6: Molar mass of
PF6 = (1 × Molar mass of P) + (6 × Molar mass of F) = Molar mass of P + (6 × 19) = Molar mass of P + 114.
Molar mass of PF6 = 285.83 g/mol.
Mass of phosphorus in PF6 is 30.97 g/mol.
Mass of fluorine in PF6 is 254.86 g/mol.
PFX: Molar mass of PFX = (1 × Molar mass of P) + (x × Molar mass of F) = Molar mass of P + (x × 19).
The mass of phosphorus per gram in both the compounds is the same.
Therefore, we can equate the mass of fluorine in the two compounds:mass of fluorine in PF6 / mass of phosphorus in
PF6 = mass of fluorine in PFX / mass of phosphorus in PFX.
4.86 g f/g p = mass of fluorine in PFX / (30.97 g/mol)mass of fluorine in PFX = (4.86 g f/g p) × (30.97 g/mol)mass of fluorine in PFX = 150.82 g/mol
Molar mass of PFX = Molar mass of P + (x × 19) = 30.97 + (x × 19)150.82 = 30.97 + (x × 19)x × 19 = 119.85x = 119.85 / 19x = 6.31x = 6 (rounded off to the nearest whole number)
Therefore, the value of x for the second compound is 6.
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Which is not an advantage of using the pyramid of energy? a. It takes into account the rate of production over a period of time. B. Assigning the decomposers and detritivores to a particular trophic level. C. There are no inverted pyramids. D. The input of solar energy can be added. Please select the best answer from the choices provided a b c d
Answers
Pyramid of energy has not an advantage: B. Assigning the decomposers and detritivores to a particular trophic level.
Pyramid of energy is a graphical representation of the amount of energy at each trophic level of a food chain (see the picture below).
The bottom level represents the producers, followed by primary, secondary and tertiary consumers.
The decomposers and detritivores do not have a particular trophic level.
Decomposers break down dead plants and animals into simpler inorganic substances.
Detritivores are organisms, for example a fungus or an earthworm, that are decomposing organic matter.
Decomposers have very important role in the circle of life.
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Answer:
b. Assigning the decomposers and detritivores to a particular trophic level.
Explanation:
earth is one of the planets in the
Answers
Answer:
moon obviously
Explanation:
........
MgCl2 (aq) + K2SO4 (aq) --> 2KCl (aq) + MgSO4 (s)
how many moles of potassium chloride are produced from 4.8 moles of magnesium chloride
Answers
Answer:
\(\boxed {\boxed {\sf 9.6 \ mol \ KCl}}\)
Explanation:
We must use stoichiometry to solve this, which is the calculation of reactants and products in a reaction using ratios.
Let's analyze the reaction given.
\(MgCl_2 _{(aq)} + K_2SO_4 _{(aq)} \rightarrow 2KCl _{(aq)} + MgSO_4 _{(s)}\)
Now, look at the coefficients, or numbers in front of the molecule formulas. If there isn't a coefficient, then a 1 is implied.
We want to find how many moles of potassium chloride (KCl) are produced from 4.8 moles of magnesium chloride (MgCl₂). Check the coefficients for these molecules.
MgCl₂: no coefficient= coefficient of 1 KCl: coefficient of 2The coefficient represents the number of moles. Therefore, 1 mole of magnesium chloride produces 2 moles of potassium chloride. We can set up a ratio using this information.
\(\frac { 1 \ mol \ MgCl_2} {2 \ mol \ KCl}\)
Multiply by the given number of moles of magnesium chloride: 4.8
\(4.8 \ mol \ MgCl_2 *\frac { 1 \ mol \ MgCl_2} {2 \ mol \ KCl}\)
Flip the ratio so the moles of magnesium chloride cancel out.
\(4.8 \ mol \ MgCl_2 *\frac {2 \ mol \ KCl} { 1 \ mol \ MgCl_2}\)
\(4.8 *\frac {2 \ mol \ KCl} { 1 \ } }\)
\(4.8 * {2 \ mol \ KCl}\)
\(9.6 \ mol \ KCl\)
9.6 moles of potassium chloride are produced from 4.8 moles of magnesium chloride.
What is a colligative property related to a decrease in the vapor pressure of a solution?
Answers
One colligative property related to a decrease in the vapor pressure of a solution is **Raoult's law**.
According to Raoult's law, the vapor pressure of a solvent in a solution is directly proportional to the mole fraction of the solvent present. In an ideal solution, the presence of a non-volatile solute lowers the vapor pressure of the solvent. This decrease in vapor pressure is a colligative property known as the **lowering of vapor pressure**.
When a solute is added to a solvent, the solute particles occupy some of the available space at the surface of the solution, reducing the number of solvent particles that can escape into the vapor phase. As a result, the vapor pressure of the solution decreases compared to that of the pure solvent.
The lowering of vapor pressure is a key factor in various practical applications, such as boiling point elevation and freezing point depression, which are also colligative properties related to the presence of solutes in a solution.
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what are the two components of a solution
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A wave has a frequency of 12,000 Hz.
What does this mean?
Select one:
The wave can travel 12.000 meters in 1 second.
The distance between the highest and lowest points of the wave is 12,000 microns.
The distance between the two crests of a wave is 12,000 microns.
In one second. 12,000 crests of this wave pass through a given point.
Answers
A wave with a frequency of 12,000 Hz means that in one second, 12,000 crests of this wave pass through a given point.
Frequency is the number of cycles of a wave that occur in a given amount of time, usually measured in Hertz (Hz). In this case, the wave is oscillating 12,000 times per second, which is a high frequency commonly associated with ultrasound waves and radio waves.
The distance between the two crests of the wave, known as the wavelength, can be calculated using the wave speed and frequency.
However, the given frequency alone does not provide information about the distance or amplitude of the wave.
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The melting point of four different types of solids is tested: ionic,
molecular, network covalent, and metallic. Given the data below,
which is the network covalent compound?
Select one:
-Water, 0°C
-Potassium chloride, 770°C
-Boron nitride, 2973°C
-Lead, 327.5°C
Answers
According to the data given, the network covalent compound is boron nitride.
What is a covalent compound?
Covalent compound is defined as a type of compound which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.
Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent compound involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.
Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.
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The name for a mixture in which all samples are made up of the same
proportions of matter is:
Answers
Answer: homogeneous mixture
Explanation:
If a car travels 150 km in 3.0 hours, the speed is ?
Answers
Answer:
50km per hour.
Part of the speed, distance, time triangle.
To get speed, just divide distance by time. 150/3=50
How does temperature affect reaction rate of enzymes?
Answers
Answer:
Temperature has a significant effect on the reaction rate of enzymes. At low temperatures, the reaction rate is typically slower as the enzymes and substrate molecules move more slowly, reducing the likelihood of successful collisions between them. As the temperature increases, the reaction rate generally increases as well, due to increased enzyme activity and the higher likelihood of successful collisions.
However, at high temperatures, the reaction rate can decrease rapidly as the enzyme's structure becomes denatured or permanently altered, resulting in a loss of enzyme activity. Enzymes have an optimal temperature range, typically between 37°C to 40°C (or 98.6°F to 104°F) for human enzymes, beyond which they become less efficient or inactive.
Therefore, temperature must be carefully controlled when conducting experiments with enzymes. At temperatures close to the optimal range, enzyme activity is highest and the reaction rate is fastest. However, at temperatures outside this range, the reaction rate can slow down or the enzyme can become denatured, leading to a loss of activity.
please help. I was hoping someone could explain it , cause I have no idea what I'm doing PLEASE HELP. ASAP!!!!
Answers
The additional information that is required to obtain the enthalpy of neutralization is the density of the solution.
What is the enthalpy?We know that the enthalpy of neutralization is defined as the heat that is evolved when an acid is neutralized by a base under standard conditions. We can be able to obtain the enthalpy of the neutralization of the acid and the base by performance of some simple chemical calculations.
To carry out this calculations we need the all of the pieces of information that have been listed in the question such as the masses of the solution, the temperature of the solution in the initial and final states and so on.
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You are a scientist and you test a substance to figure out what the substance is for new discoveries. Here are some of the empirical data you collected:
• The substance is a solid at room temperature.
• It melts at 850 °C.
• When you dissolve it in water, it is able to conduct electricity.
What is the most likely bond type that this substance has?
• Nonpolar Covalent
• Ionic
Answers
Based on the empirical data provided, the most likely bond type for this substance is Option D. Ionic.
The fact that the substance is a solid at room temperature suggests that it has strong forces holding its particles together. Ionic compounds typically have high melting points due to the strong electrostatic attraction between positively and negatively charged ions. The substance's melting point of 850 °C further supports the presence of ionic bonds, as this high temperature is required to break the strong bond forces in an ionic compound.
The ability of the substance to conduct electricity when dissolved in water also points to an ionic bond. Ionic compounds, when dissolved in water, dissociate into ions that are free to move and carry electric charge. This mobility of ions allows for the conduction of electricity, a characteristic commonly associated with ionic compounds.
Therefore, based on the solid state at room temperature, high melting point, and the ability to conduct electricity, it is reasonable to conclude that the most likely bond type for this substance is Ionic (option D).
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The question was Incomplete, Find the full content below:
You are a scientist and you test a substance to figure out what the substance is for new discoveries. Here are some of the empirical data you collected:
•The substance is a solid at room temperature.
•It melts at 850 °C.
• When you dissolve it in water, it is able to conduct electricity.
What is the most likely bond type that this substance has?
A. Polar covalent
B. Nonpolar Covalent
C. Metallic
D. lonic
A 2.5-liter sample of a gas has 0.30 mole of the gas. If 0.15 mole of the gas is added, what is the final volume of the gas? Temperature and pressure remain constant.
Answers
Answer:
1.125
Explanation:
I think it is his because if you add 0.30 and 0.15 it adds up to 0.45 so you just multiply 0.45 and 2.5 and then it gives you 1.125. HOPE IT HELPS.
Calcium + magnesium sulfide
Answers
Answer:
Calcium and magnesium sulphide react to form calcium sulphide and magnesium metal.
Explanation:
Ca + MgS → CaS + Mg
The reaction between calcium and magnesium sulfide produces calcium sulfide and magnesium metal. The balanced equation can be given as Ca + MgS → CaS + Mg.
What is balanced chemical equation?
An equation for just a chemical reaction is said to be balanced if both the reactants as well as the products have the same number of atoms and total charge for each component of the reaction. In other words, both side of the reaction have an equal balance of mass and charge.
Conservation of charge as well as mass, equation and reaction balance, etc. The components and outcomes of a chemical reaction are listed in an imbalanced chemical equation, but the amounts necessary to meet the conservation of mass are not specified. The reaction between calcium and magnesium sulfide produces calcium sulfide and magnesium metal. The balanced equation can be given as Ca + MgS → CaS + Mg.
Therefore, the balanced equation can be given as Ca + MgS → CaS + Mg.
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A sample of 140.1 g of a noble gas occupies 40.75 L at 758 mm Hg and 23.0 °C. What is its molar mass? Use 3 significant figures. Identify the noble gas.
Answers
The noble gas with a molar mass of 80.0 g/mol is Krypton (Kr).
To find the molar mass of the noble gas, follow these steps:
1. Convert the given pressure to atmospheres: 758 mm Hg × (1 atm / 760 mm Hg) = 0.998 atm.
2. Convert the given temperature to Kelvin: 23.0 °C + 273.15 = 296.15 K.
3. Use the ideal gas law equation, PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant (0.08206 L atm / mol K), and T is the temperature.
4. Rearrange the equation to solve for n: n = PV / RT.
5. Plug in the given values: n = (0.998 atm × 40.75 L) / (0.08206 L atm / mol K × 296.15 K) = 1.7515 mol.
6. Calculate the molar mass by dividing the mass of the gas by the number of moles: Molar mass = 140.1 g / 1.7515 mol = 80.0 g/mol (rounded to 3 significant figures).
The noble gas with a molar mass of 80.0 g/mol is Krypton (Kr).
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