Answer:
1.25 g C3H8
Explanation:
edge lol
Which element is most likely to have a high thermal conductivity
Copper has the highest thermal conductivity as compared to other metals in the periodic table.
What is thermal conductivity?Thermal conductivity refers to the rate at which heat is transferred by conduction through a unit cross-section area of a material. When a temperature increases at one end it moves to the other end through conduction.
So we can conclude that Copper has the highest thermal conductivity as compared to other metals in the periodic table.
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It is the year 2040, and you are a research scientist. The amount of sunlight that reaches the earth has been drastically reduced due to a major event like pollution, fires, or volcanoes. Farmers are asking you for help to save their failing crops.
calculate the number of moles in positive and negative ions in 1.75 moles of calcium fluoride quizlet
CaF₂ ⇒ Ca²⁺ + 2F⁻
1.75 1.75 3.5
Consider the reaction below.
C₂H4(g) + H₂(g) → C₂H6(g)
Answer:
I don't see a question.
Explanation:
I do see a reaction in which tells us that the C2H4 has a double-bonded C. The additrtion of H2 breaks this bond and provides the two bonding sites needed for the 2 new hydrogen atoms.
H2C=CH2 + H2 → H3C-CH3
Which of the following could have been formed by reacting iron with sulfur?
A. Iron oxide
B. Sulfuric iron
C. Iron sulfide
D. Sulfuric acid
Answer: C
Explanation:
iron sulfide.
Answer:
C. Iron sulfide
Explanation:
Stay safe, stay healthy and blessed
Have a good day
Thank you
Based on the electron configuration of the two
atoms, predict the ratio of metal cationic (+) atom
to nonmetal anionic (-) atom in the compound.
Magnesium 1s²2s²2p63s²
Sulfur 1s²2s²2p63s²3p4
A compound formed between Magnesium and Sulfur is MgS.
What is a cation?Cations are positively-charged ions (atoms or groups of atoms that have more protons than electrons due to having lost one or more electrons).
Magnesium, Mg, is located in period 3, group 2 of the periodic table, and has two electrons on its outermost shell.
On the other hand, sulfur, S, is located in period 3, group 16 of the periodic table, and has six electrons on its outermost shell.
Chemical reactivity is governed by an atom's "desire" to have a stable electron configuration and to have eight electrons in its outermost shell to complete an octet.
In this case, magnesium can complete its octet by giving up those two valence electrons, becoming the magnesium cation.
[tex]Mg^{2+}[/tex], in the process.
Sulfur, which only needs two electrons to complete its octet, will pick up the two electrons coming from magnesium, becoming the sulfide anion,
[tex]S^{2−}[/tex], in the process.
The electrostatic force of attraction will then bring the magnesium cations and the sulfur anions together to form an ionic bond.
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The greatest progress in reducing atmospheric levels of lead pollution resulted from Group of answer choices the switch from lead to graphite in pencils. new types of lead scrubbers on smokestacks that removed lead from the air. the development of new types of batteries that use lithium instead of lead. the elimination of leaded gas.
The greatest progress in reducing atmospheric levels of lead pollution resulted from the elimination of leaded gas.
What is atmospheric lead pollution?Atmospheric lead pollution refers to the presence of lead particles in the atmosphere.
Lead is a pollutant which affects the respiratory system.
Fuels that contains lead when burned releases lead into the atmosphere.
Therefore, the greatest progress in reducing atmospheric levels of lead pollution resulted from the elimination of leaded gas.
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Suppose you use bottles and balloons to run an experiment to measure the amount of metabolism by yeast. One of your bottles has black coffee and yeast, with a balloon sealing the top of the bottle. After 3 hours, you note that the balloon has not inflated at all. What is the most likely reason that it did not inflate
The yeast was not able to metabolize the sugar in black coffee and so, no carbon dioxide was produced.
What is the product of the action of glucose on yeast?Yeast metabolizes sugar or glucose to produce alcohol and carbon dioxide.
The carbon dioxide produced is responsible for the raising action of yeast on dough and for the inflation of the balloon.
In the experiment, the possible reason why the balloon did not inflate is that the yeast was not able to metabolize the sugar in black coffee and so, no carbon dioxide was produced.
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2 attempts left check my work
be sure to answer all parts.
calculate the density of a solid substance if a cube measuring 2.72 cm on one side has a mass of 129 g.
Answer:
6.41 gm / cm^3
Explanation:
cube volume = 2.72 x 2.72 x 2.72 cm^3 = 20.124
Density = mass / volume = 129 g / 20.124 cm^3 = 6.41 gm / cm^3
Describe the characteristics that identify a sample of matter as being a substance.
Answer:
Any characteristic that can be measured, such as an object's density, color, mass, volume, length, malleability, melting point, hardness, odor, temperature, and more, are considered properties of matter.
1. How does the Key change for a weak acid?
2. How would the images change for a weak acid solution of the same concentration? Draw the images and/or
describe with words.
3. Draw the images and/or describe with words a weak acid and a strong acid solution of the greater
concentration? Make any notes that might help you remember.
4. Write the chemical reactions for a weak acid and a strong acid.
5. Is there one type of representation that might be the best one for you to remember information about weak
and strong acids?
6. Make any notes that might help you remember how to compare/contrast the two types.
The weak acid will have fewer ions than the strong acid of similar concentration.
The chemical reactions for a weak acid and a strong acid is given below:
Strong acid: HA → H⁺ + A⁻Weak acid: HA ⇆ H⁺ + A⁻What are strong and weak acids?Strong acids are acids which dissociate completely in solutions. Examples of strong acids are hydrochloric acid and sulfuric acid.
Weak acids are acids which dissociate only partially in solutions. Examples of weak acids are carbonic acid and acetic acid.
Weak acids of a similar concentration to a strong acid have fewer hydrogen ions.
The equation of the dissociation of strong acids and weak acids are given below:
Strong acid: HA → H⁺ + A⁻Weak acid: HA ⇆ H⁺ + A⁻In conclusion, weak acids produce few ions in solution while strong acids fully dissociate into ions in solution.
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How can i calculate the concentration of 2.357g of sodium chloride in 75ml solution
Answer:
See below
Explanation:
Simply : 2.357 g / 75 ml = .03142 gm/ml or 31.42 gm / liter
what is the molecular formula of Ferric Oxide with criss-cross method
Answer: Fe2O3
Explanation: By applying crisscross method, the formula will be Fe2O3.
What volume did a helium-filled balloon have at 18.1 °C and 2.61 atm if its new volume was 59.9 mL at 1.92 atm and 12.5°C?
a. 44.9
b. 63.8
c.43.2
d. 83.0
Answer:
a. V=44.9mL
Explanation:
For a gas undergoing all of these changes, it will be important to combine Boyle's Law and Charles' Law to form the following equation (if it isn't already known):
[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]
Where the Temperatures must be measured in Kelvin.
Recall that to convert Celsius to Kelvin, one must add 273 or use the equation [tex]T_C+273=T_K[/tex].
Thus, [tex]T_1=(18.1+273)[K]=291.1[K][/tex] and [tex]T_2=(12.5+273)[K]=285.5[K][/tex]
To solve for the requested quantity, note that all of the other units match between beginning and end, so we substitute and solve:
[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]
[tex]\dfrac{(2.61[atm])V_1}{(291.1[K])}=\dfrac{(1.92[atm])(59.9[mL])}{(285.5[K])}[/tex]
[tex]\dfrac{(2.61[atm] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----})\bold{V_1}}{291.1[K] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----}}*\dfrac{291.1[K] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----}}{2.61[atm]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----}}=\dfrac{(1.92[atm]\!\!\!\!\!\!\!\!\!\!\!{--})(59.9[mL])}{285.5[K\!\!\!\!\!{-}]}*\dfrac{291.1[K\!\!\!\!\!{-}]}{2.61[atm]\!\!\!\!\!\!\!\!\!\!\!{--}}[/tex]
[tex]V_1=44.928677576[mL][/tex]
Accounting for significant digits, [tex]V_1=44.9[mL][/tex]
classify the following into colloids, suspensions and true solution: soda water,chalk powder,milk,blood,ink,starch solution,sulphur powder in water,egg albumin.
Answer:
Amm is this right (if is it the right so mark me the brainliest pls)
Explanation:
Answer : Solutions- Brine, Soda water. Suspensions- Muddy river water, Chalk water mixture, Milk of magnesia, Smoke in air. Colloids- Milk, Ink, Blood, shaving cream.
What happens to the atomic radius when an electron is gained?
OA. The negative ionic radius is larger than the neutral atomic radius
B. The negative ionic radius is smaller than the neutral atomic radi
C. The negative ionic radius is the same size as the neutral atomic
radius.
D. The negative ionic radius does not follow a trend with the neutra
radius.
When molten magma cools ________ under the surface, it forms _________ igneous rocks.
A. rapidly, extrusive
B. slowly, extrusive
C. rapidly, intrusive
D. slowly, intrusive
which are not oxidative reaction?
(look at the image)
Answer:
Cu²+ e ----> Cu+This is not oxidation as it gain electron .
Oxidation reaction means addition of oxygen or removal of hydrogen
or in other words loss of electrons
Mg ----> Mg²+ + 2e
this is oxidation reaction as Mg loss 2e to become +2
Sn³+ -----> Sn4+ + 2e
this is oxidation reaction as it losses electrons
similarly other are also oxidation.
Hydrogen reacts with an element to form a compound. which element would have the most valence electrons available to react with hydrogen?
Answer:
the element is oxygen
Explanation:
it will react to give H2O
What is periodicity?
the quality of being periodic the tangency to record the intervals
the prediotic of the sun sports cycle
calculate the amount of glucose required to prepare 250g of 5% sugar solution
Answer:
12.5g
Explanation:
1. Percentage of solution = 5.
2. Mass of solution = 250g.
3. = Mass of solute / 250 x 100.
4. = 5 x 250 / 100.
5. = 12.5g.
What was the weakness of the rutherford model of the atom that bohr addressed?
The weakness of the rutherford model of the atom that bohr addressed is that
The energy of the atom is quantized andThe atom does not lose energy as the electon rotates about the nucleusWhat is Rutherford model of the atom?The Rutherford model of the atom proposed by Ernest Rutherford in 1911 shows that the atom is much hollow space with its mass concentrated at the center being surrounded by electrons. It is the planetary model.
What is the Bohr model of the atom?The Bohr model of the atom proposed by Neils Bohr in 1913 suggests that
the energy of an atom is quantized and that it does not lose energy as the electron rotates about the nucleus.What was the weakness of the rutherford model of the atom that bohr addressed?The weakness of the rutherford model of the atom that bohr addressed is that
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A student spilled a bottle of ammonia in one corner of the laboratory. Soon the whole laboratory was felled with pungent irritating small. The students immediately opened the windows and doors and switched on the exhaust fans. After sometime, students got relief. Explain what did actually happen?
Answer: Initially when the student spilled the bottle of ammonia the ammonia gas particles diffused with the particles of air in the room. We know that the rate of diffusion of gases is very high. So the entire room filled up with the pungent smell of ammonia.
When he opened the doors and windows and switched on the exhaust fan, the air from the room along with the ammonia gas diffused with the air outside the room.Moreover, outside air entered into the room so the concentration of ammonia gas in the room air reduced.Due to these reasons the student got relief.
what is the wavelength of a microwave with a frequency of 2450 mhz
Answer:
See below
Explanation:
The way to calculate this
speed of light = wavelength * frequency
3 x 10 ^8 m/s = wavelength * 2450000000 Hz
wavelength = .12245 meters
= 1.2245 x 10^-1 Meters
The wavelength of a microwave with a frequency of 2450 mhz is 1.2245 x 10⁻¹ meters.
What is wavelength?The wavelength is the time period or spatial period between the periodic wave and the distance between two waves. A microwave is a form of electromagnetic radiation.
The frequency of a microwave, f = 2450 MHz
We need to find the wavelength and the period of the microwaves
c = f λ
c = speed of light = 3 x 10 m/sec. 8 c = λf where λ = wavelength, f = frequency. Length
The relation between the wavelength and frequency is given by
The speed of light = wavelength x frequency
3 x 10⁸ m/s = wavelength x 24500 Hz
Wavelength = .12245 meters
1.2245 x 10⁻¹ Meters
Therefore, the wavelength of a microwave with a frequency of 2450 MHz is 1.2245 x 10⁻¹ meters.
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How many moles of hydrogen atoms are contained in one mole of[tex]C_{6}H_{12}[/tex]?
The number of moles of hydrogen atoms contained in 1 mole of c6h12 is 12.
What is hydrogen made of?Hydrogen can be produced from various domestic resources such as fossil fuels, biomass, and the electrolysis of water by electricity. The environmental sustainability and energy efficiency of hydrogen depends on how hydrogen is produced.
Hydrogen is the simplest element. Each hydrogen atom has only one proton. Hydrogen is also the most abundant element in the universe. Stars like the Sun are mainly made of hydrogen. The sun is essentially a giant sphere of hydrogen and helium gas.
Some facts about hydrogen:
Hydrogen is the most abundant element on earth. Hydrogen is an alternative fuel with a very high energy content by weight.The fuel cell can be used to power multiple applications.Fuel cells are a clean way to generate electricity.Fuel cell vehicles are very similar to traditional gasoline vehicles
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I need the answer asap
Answer:
Explanation:
i ned help
A syringe containing 35.0 mL of Xe gas at 298 K has a pressure of 0.980 atm. How many grams of Xe are in the syringe? Report your answer to the nearest 0.001 g
The mass of Xe present in the syringe given the data is 0.183 g
How to determine the mole of Xe Volume (V) = 35 mL = 35 / 1000 = 0.035 L Pressure (P) = 0.980 atm Temperature (T) = 298 KGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?Using the ideal gas equation, we can obtain the mole of Xe as follow:
n = PV / RT
n = (0.98 × 0.035) / (0.0821 × 298)
n = 0.0014 mole
How to determine the mass of XeMole = 0.0014 moleMolar mass of Xe = 131 g/moleMass of Xe = ?Mass = mole × molar mass
Mass of Xe = 0.0014 × 131
Mass of Xe = 0.183 g
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What is the change in freezing
point, ATf, when the 0.195 m
aqueous solution of K2S dissolves
into 3 particles?
-1.09'C is the change in freezing point
“Freezing point depression” depends on the solvent and the molar concentration of the solute.
Sulfide is highly basic, consequently
K2S
completely and irreversibly hydrolyzes in water according to the following equation:
K2S+H2O→KOH+KSH
What is freezing?Freezing, also known as solidification, is a phase transition where a liquid turns into a solid when its temperature is lowered below its freezing point.
the temperature at which a liquid solidifies specifically : the temperature at which the liquid and solid states of the substance are in equilibrium at atmospheric pressure : melting point the freezing point of water is 0° Celsius or 32° Fahrenheit.
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Answer:1.0881
Explanation:
Rank the gases Ar, N2, CH4, and C₂H6 in order of increasing density at STP.
Rank the gases Ar, N2, CH4, and C2H6 in order of increasing density at STP.
ans : CH4
determine the enthalpy change when 7.08g of Ag is obtained. use the abbreviated form of the unit in your answer.
2AgBr(s) -> 2Ag(s) + Br2(l) deltaH = -220kJ
2AgBr(s) ⇒ 2Ag(s) + Br₂(l) ΔH = -220kJ ⇒ for 2 mol Ag
mol Ag = 7.08 : 108 g/mol = 0.065
the enthalpy change = 0.065/2 x -220 kJ = -7.15 kJ
