Zn(s) + 2HCl(aq) → ZnCl2(aq) +H2(g)
What type of reaction is shown?
A: Precipitation
B: Neutralization
C: Single replacement
D: Double replacement
Answer:
C: Single replacement
Explanation:
How are the input and output forces of the parts of a complex machine related?
what mass of oxygen reacts when 84.9 g of iron is consumed in the following reaction: Fe+O2= Fe2O3
Answer:
36.385 grams of oxygen reacts when 84.9 grams of iron.
Explanation:
[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
Moles of iron = [tex]\frac{84.9 g}{56 g/mol}=1.5160 mol[/tex]
According to reaction, 4 moles of iron reacts with 3 moles of oxygen gas.
Then 1.5160 moles of iron will react with:
[tex]\frac{3}{4}\times 1.5160 mol=1.1370 mol[/tex] of oxygen gas
Mass of 1.1370 moles of oxygen gas:
[tex]1.1370 mol\times 32 g/mol=36.385 g[/tex]
36.385 grams of oxygen reacts when 84.9 grams of iron.
Which graph best demonstrates the general relationship between mass and temperature, similar to the trend of thermal energy absorbed by your sand and water samples
The graph that best demonstrates the general relationship between mass and temperature, similar to the trend of thermal energy absorbed by sand and water samples, is the first graph on the left.
The first graph on the left shows a negative correlation between mass and temperature, indicating that as mass increases, the temperature decreases.
This relationship often reflects how larger masses require more thermal energy to achieve the same temperature increase, which is a typical trend observed in thermal energy absorption experiments with different materials like sand and water.
The other graphs (middle and right) show no correlation and a positive correlation respectively, which do not align with the expected trend.
How many moles of glucose are present in 1.0 L of a 2.5 M solution of glucose in water?
How does fluorine react with ethene?
1. By substituting hydrogen with fluorine.
2. By breaking a carbon double bond and adding fluorine.
3 By removing hydrogen because of fluorine’s attraction to hydrogen’s nucleus.
4. Fluorine and ethene do not react spontaneously.
Option 3: By removing hydrogen because of fluorine's attraction to hydrogen's nucleus.
The reaction of ethene and halogen generally breaks the carbon-carbon double bond and substitution of halogen on carbon takes place, this is known as halogenation reaction. This is in the case of reaction of ethene with chlorine, bromine and iodine. In the case of fluorine, due to high electronegativity it get attracts to the nucleus of hydrogen and form hydrogen fluorine gas. Therefore, halogentaion reaction do not take place in the case of ethene and iodine.
Ethene explosively reacts with fluorine to form carbon and hydrogen fluoride gas. The reaction is as follows:
[tex]CH_{2}CH_{2}+2F_{2}\rightarrow 2C+4HF[/tex]
if the mass of an object on earth is 40 kilograms its mass on the moon is 64 kilograms but what eould be the weight on the moon
The weight of an object with a mass of 40 kilograms on the Moon would be 66.8 Newtons, as weight is calculated by multiplying the mass by the lunar gravitational acceleration of 1.67 m/s².
If the mass of an object on Earth is 40 kilograms, and assuming that mass does not change regardless of location, this mass would remain the same on the Moon. However, since weight is a measure of the force of gravity on an object, it will vary depending on the gravitational pull of the body it is on. The gravitational acceleration on the Moon is 1.67 m/s². Therefore, on the Moon, the weight of a 40 kg object would be calculated as follows:
Weight on the Moon = mass × moon's gravitational acceleration
Weight on the Moon = 40 kg × 1.67 m/s²
Weight on the Moon = 66.8 N (Newtons)
So, if an object has a mass of 40 kilograms, its weight on the Moon would be 66.8 Newtons.
If you wanted to determine the temperature of a star which measurement would you maker
To determine a star's temperature, measuring its absorption spectrum or emission spectrum is best, as the Doppler shifts within the lines of the spectrum hint at the star's temperature. Option C, D is correct.
The colors and spectral classes obtained from these spectra can help estimate the star's temperature. The spectrum of a star reveals the specific wavelengths of light that the star emits or absorbs.
The emission spectrum reveals the wavelengths of light a star emits, which we can use to estimate the star's temperature. Similarly, by analyzing the absorption spectrum, which consists of dark lines superimposed on the continuous spectrum of the star, temperature can also be inferred.
The absorption spectrum is specifically of interest because the precise measurement of the width of absorption lines allows for determining the temperature; these Doppler shifts in the absorption lines are prominent and easier to detect, compared to shifts in the continuous spectrum.
Hence, C. D. is the correct option.
The complete question is:
If you wanted to determine the temperature of a star which measurement would you maker ?
A) Refraction
B) Doppler shift
C) emission spectrum
D) absorption spectrum
if a minerals breaks into cubes when struck with a rock hammer, which property of mineral is being measured
a.) streak
b.) cleavage
c.) hardness
d.) color
The element that has the most important effect on the weldability of common gray cast iron is? A. copper B. Carbon C. Steel D. Sulphur
The correct option is b i.e, Carbon significantly affects the weldability of common gray cast iron due to its high content and impact on microstructure, leading to potential brittleness and cracking during welding.
The element that has the most important effect on the weldability of common gray cast iron is notably carbon. Gray cast iron contains a high percentage of carbon, typically between 2.5% and 4.0%, which forms large graphite flakes within an iron matrix. These graphite flakes give gray cast iron its characteristic properties, such as good machinability and vibration damping, but they also create challenges during welding because they can lead to brittleness and cracking in the heat-affected zone.
Carbon's presence in high concentrations impacts the microstructure of the iron, making the weldability more complex compared to other elements like copper, steel, or sulfur. This is primarily because excessive carbon can lead to the formation of hard and brittle phases during cooling, which complicates the welding process.
I need one last question to finish up, please help!
besides the major types of radioactive decay there are two others: positron emission and electron capture.
-compare and contrast positrons with electrons
-explain how positron emission works and how it causes transmutations
-explain how electron capture works and how ir causes transmutations
-compare the transmutations caused by positron emissions and electron capture
Positron emission = emission of a positron and a neutrino when a proton is convert into a neutron. The total number of particles in the nucleus doesn't change, -1 proton +1 neutron
It's a spontaneous reaction for some nucleus.
eg:
Positron = e+
Neutrino=ve
O-15 --> N-15 + e+ +ve
Electron capture= A nucleus absorb an electron while a proton is convert in a neutron and emit a neutrino. The total number of particles in the nucleus doesn't change, -1 proton +1 neutron
eg:
Al-26 +e- --> Mg-26 + ve
Electron capture and positron emission are two mechanisms to explain the decay of some unstable isotopes. Electron capture is usually observed when the energy difference between the initial and final state is low. Mainly because of the larger amount of kinetic energy need for the expulsion of two particles with the positron emission mechanism.
The water in a 150-mL flask is poured into a beaker that contains 600 mL of ethyl alcohol. Which substance is the solvent in this mixture?
water because it is a very polar compound
ethyl alcohol because it has a lower density than water
ethyl alcohol because it has a much larger volume than water
water because it has dissolved in ethyl alcohol
Ethyl alcohol is the solvent in this mixture because it is the substance present in a larger volume and has dissolved the water.
The substance that is the solvent in a mixture is the one that makes up the majority of the solution and is responsible for dissolving the other substance (solute). In this case, the water is poured into the beaker containing ethyl alcohol, and it's mentioned that there are 600 mL of ethyl alcohol in the beaker.
Therefore, ethyl alcohol is the solvent in this mixture because it is the substance present in a larger volume and has dissolved the water. Water is the solute in this case, as it has been added to the ethyl alcohol. The fact that water is a polar compound is not relevant in determining which substance is the solvent; the solvent is typically the substance in greater quantity in the solution.
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a test tube full of sulfur dioxide gad was turned upside down in a beaker of water and universal indicator.after a few minutes the water hae risen up the test tube why does the water rise up the test tube
How much heat do you need to raise the temperature of 150 g of ice from -30°C to -15°c?
The heat needed to raise the temperature of 150 g of ice from -30°C to -15°C is 4704 Joules. This uses the fact that the heat absorbed by ice in its solid state is constant (0.50 cal/g °C), and the principle that heat calculations rely on mass, specific heat capacity, and the change in temperature.
Explanation:In the question, the student needs to find out the amount of heat required to raise the temperature of 150 g of ice from -30°C to -15°C. The task only involves heating ice, while keeping it in solid form as the raised temperatures are still below 0°C. To find the required heat, we can use the formula q = mcΔT, where 'q' is heat, 'm' is mass, 'c' is the specific heat capacity and 'ΔT' is the change in temperature. From the available information, ice absorbs heat at a constant rate of 0.50 cal/g °C. We have to translate this into the SI unit for heat (Joules) as: 1 cal = 4.184 J. Therefore, the specific heat of ice in SI units is: 0.50 cal/g °C * 4.184 J/cal = 2.092 J/g °C.
Substitute the given values into the formula: q = 150 g * 2.092 J/g °C * 15 °C = 4704 J. Therefore, 4704 Joules of heat is needed to raise the temperature of 150 g of ice from -30°C to -15°C.
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oxidation-reduction reactions occur because of the competition between particles for
Redox reactions are due to competition between particles for electrons. These reactions involve the back-and-forth transfer of electrons, with accompanying energy shifts. Major contributors to the process are co-enzymes like NAD and FAD.
Explanation:Oxidation-reduction reactions, also known as redox reactions, occur because of competition between particles for electrons. This process involves the transfer of electrons from one compound (the donor) to another compound (the recipient). When an electron is passed from a donor molecule, it undergoes oxidation. The recipient molecule, on the other hand, goes through a process called reduction, meaning it gains an electron.
Utilization of the transferred electrons involves the release and absorption of energy. Commonly, these reactions occur in a series, meaning a molecule that is reduced (gains an electron) is subsequently oxidized (loses the electron), passing on both the electron and the absorbed energy to the next molecule. Over time, this results in an accumulation of energy that is further used for various metabolic functions.
Some major contributors to this process are coenzymes like nicotinamide adenine dinucleotide (NAD) and flavin adenine dinucleotide (FAD). These coenzymes accept and transfer high-energy electrons between compounds in pathways, thereby playing a crucial role in redox reactions.
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Mineral base lubricants are used what type of mobile AC system
WILL MARK BRAINLIST
Just need a small paragraph for each heading.
Which is a sustainable practice?
wind farms
clear cutting
flood irrigation
overfishing
Answer:
wind farmsExplanation:
Identify whether each element is a halogen, a noble gas, or nonmetal only. Astatine (At): Nitrogen (N): Krypton (Kr): Chlorine (Cl): Sulfur (S):
Answer:
Astatine and chlorine are halogens onlyNitrogen and sulphur are non metals onlyKrypton (Kr) is noble gas onlyExplanation
Answer:
Astatine are halogens only
Nitrogen are non metals only
Krypton (Kr) is noble gas only
Chlorine (Cl): halogen
Sulfur (S) non metals only
Explanation:
For the Redi experiment , Match the experiment to it’s description?
Which is a correct description of the enthalpy of a reaction?
A.The enthalpy of a reaction is the same as each intermediate reaction. B.The enthalpy of a reaction does not depend on the intermediate reactions. C.The enthalpy of a reaction depends on the intermediate reactions. D.The enthalpy of a reaction is always positive.
The enthalpy of a reaction does not depend on intermediate reactions but on the initial and final states, determining the overall enthalpy change as per Hess's law. Option B is correct.
The correct description of the enthalpy of a reaction is that it does not depend on the intermediate reactions. Enthalpy is a state function, which means it only depends on the initial and final states of the system, not on the path or intermediate reactions taken to get from one to the other.
This is analogous to climbing a mountain; the total altitude change is the same regardless of the path taken to reach the summit. Therefore, the enthalpy change of a chemical reaction can be determined using Hess's law, which states that the total enthalpy change during a reaction is the sum of the enthalpy changes for each step of the reaction process.
Hence, B. is the correct option.
The strongest bases are hydroxides
A. ? noble gases
B. ? group 1 and group 2 metals
C. ? transition metals
D. ? halogens
The strongest bases are hydroxide will be group 1 and and group 2 metals.
What is base?A base that totally dissociates in such an aqueous solution is referred to as a strong base.
What is group 1?The elements which have one valence electrons placed in group 1 in the periodic table.
The hydroxides were basic by nature, and so as they move down the group, basic strength rises. This is caused by the weaker M-O bond in MOH, which can break to produce OH- ions in solution, as well as the low ionization energies of certain metals. The basic intensity of the hydroxides grows as the ionization energy drops down the group.
The strongest bases are hydroxide will be group 1 and and group 2 metals.
Therefore, the correct answer will be option (B).
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The strongest bases are the hydroxides of group 1 and group 2 metals, like NaOH and Ba(OH)2, as they fully dissociate in water. Hence, the correct option is B.
The strongest bases are known to be the hydroxides of group 1 and group 2 metals in the periodic table. Hydroxides of alkali metals (group 1) such as lithium hydroxide (LiOH), sodium hydroxide (NaOH), potassium hydroxide (KOH), rubidium hydroxide (RbOH), and cesium hydroxide (CsOH) are strong bases because they completely dissociate into their respective cations and hydroxide ions (OH-) when dissolved in water. Additionally, hydroxides of heavier alkaline earth metals (group 2), like calcium hydroxide (Ca(OH)2), strontium hydroxide (Sr(OH)2), and barium hydroxide (Ba(OH)2), are also considered strong bases due to their full ionization in aqueous solutions. These substances are classified as strong electrolytes because of their ability to completely dissociate and contribute to electrical conductivity in solutions.
A 103.8g sample of nitric acid solution that is 70.0% HNO3 contains by mass
The 103.8g nitric acid solution that is 70.0% HNO3 contains approximately 72.66g of HNO3.
Explanation:The student is asking about the mass of HNO3 (nitric acid) in a given solution. Given that the solution is 70.0% HNO3, this means that 70.0% of the total mass of the solution is due to HNO3. To calculate the actual mass of HNO3 in the solution, we need to multiply the total mass of the solution (103.8g) by the percentage of HNO3 (70.0%).
Mathematically, this is (103.8g) x (70.0/100), resulting in a mass of approximately 72.66g HNO3. Therefore, this 103.8g sample of nitric acid solution contains approximately 72.66g of HNO3.
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how many moles of nh3 can he produced from the reaction of 38 g of n2
in the induced fit model of enzymes, a substrate associates itself with which part of an enzyme?
What evidence did Campbell find for the cure of cancer
Which of the following best describes sublimation?
A: A solid melting to a liquid
B: A solid melting to a liquid, which then evaporates
C: The movement of gaseous particles so that they fill the space they occupy
D: A solid forming a gas
Sublimation is best described as a solid converting to a gas. Sublimation occurs when a substance moves directly from the solid to the gas phase without first passing through the liquid phase.
What is sublimation?Sublimation occurs when a substance moves directly from the solid to the gas phase without first passing through the liquid phase. Sublimation an endothermic phase transition occurs at pressures and temperatures below a chemical's triple point in the phase diagram. Sublimation is the process by which a substance moves directly from the solid to the gas state without passing through the liquid state.According to physics, sublimation is the process of converting a substance from solid to gaseous state without it becoming liquid. At typical atmospheric pressure and temperature, the evaporation of dry ice, which is frozen carbon dioxide, is an example.To learn more about sublimation, refer to:
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Amines and amides are derivatives of:
1. nitrogen gas
2. ammonia
3. nitrous oxide
4. aldehyde
Answer: The correct answer is : 2) Ammonia
Amine :
These are organic compound which are derivatives of ammonia (NH₃) gas . In Amine one or more Hydrogen atom in ammonia are replaced by carbon atom.
The general structure of ammonia as bond between N and carbon . Number of carbons may vary from 1 to 4 .(Image attached )
Example : CH₃-NH₂ , CH₃-NH-CH₃
2) Amides :
These are organic compound in which the Hydroxyl (OH) group of carboxylic acid (COOH) is replaced by amino group (NH₂) . SO they are derivatives of carboxylic group but since they also have amino group , so they can be said as derivatives of ammonia . (image attached )
Example : CH₃-CO-NH2 , CH₃-CO-NH-CH₃ .
Hence it can be said that Amine and Amide are derivaties of ammonia (NH₃)
Amines and amides are derivatives of ammonia. They are formed by a process called substitution in which hydrogen atoms from the ammonia molecule are replaced by other functional groups.
Amines and amides are derivatives of ammonia. These molecules are both derived from ammonia by a process called substitution, where one or more of the hydrogen atoms in ammonia is replaced by other functional groups. For example, in an amine, one or more of the hydrogen atoms is replaced by an alkyl or aryl group. In an amide, one of the hydrogens in ammonia is replaced by a carboxyl group. This substitution leads to the properties that make amines and amides unique.
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Read the following passage: The movement of tectonic plates buries a rock deep inside Earth. Intense heat and pressure change the mineral composition of the rock and transform it into Rock A. Rock A melts and comes out to the surface of Earth during a volcanic eruption. The molten rock cools rapidly to form Rock B. Which statement is most likely correct? Rock B may have fossils. Rock A may have shiny, glassy surface. Rock A is composed of layers of sediments. Rock B has a fine grainy texture and small crystals.
The answer is D
hope this isnt too late
The movement of tectonic plates buries a rock deep inside Earth. Intense heat and pressure change the mineral composition of the rock and transform it into rock as rock A is composed of layers of sediments. Rock B has a fine grainy texture and small crystals.
What are minerals?Minerals are defined as a chemical compound which has a well -defined composition and possesses a specific crystal structure.It occurs naturally in the pure form.
If a compound occurs naturally in different crystal structure then each structure is considered as a different mineral.The chemical composition of a mineral varies depending on the presence of small impurities which are present in small quantities.
Some minerals can have variable proportions of two or more chemical elements which occupy equivalent position in the crystal structure.It may also have variable composition which is split into separate species.
Physical properties of minerals include color,streak, luster,specific gravity and cleavage.
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Identify the missing coefficient in the balanced equation and classify the type of reaction. 2Cl2 + 2KI ⟶ _____KCl2 + I2
Answer:
2; Single Displacement
Explanation: