Answer:
1. D. cal......
2.A. iron
3. D
4.2.44j/g°C A
5,Lf=334J/g B
Explanation:
1: Which of the following is the abbreviation for a unit of energy? A. K / B. °C/ C. W / D. cal...............
calorie is the unit of energy
#2: A 200 g block of a substance requires 1.84 kJ of heat to raise its temperature from 25°C to 45°C. Use the table attached to identify the substance. A. iron/ B. aluminum/ C. gold/ D. copper.....................
Q=mcdt
1840=0.2*C*(45-25)
C=460J/KgK
if the specific heat capacity is the above then he substance is iron
#3: In a calorimeter, the temperature of 100 g of water decreased by 10°C when 10 g of ice melted. How much heat was absorbed by the ice? A. 418 kJ / B. 100 kJ / C. 10 J / D. 4.18 kJ .................
Q=mcdT
Q=0.1*10*4180
Q=4180j. answer D
.#4: The amount of heat needed to raise the temperature of 50 g of a substance by 15°C is 1.83 kJ. What is the specific heat of the substance? A. 2.44 J/g-°C / B. 2.22 J/g-°C / C. 2.13 J/g-°C / D. 2.05 J/g-°C ................
Q=mcdT
1830=50/1000*C*15
C=2440j/kg/k
change it to j/g°C
2.44j/g°C A
#5: In a calorimeter, 3.34 kJ of heat was absorbed when 10 g of ice melted. What is the enthalpy of fusion of the ice? A. 6.68 J/g / B. 334 J/g / C. 6.68 kJ/g/ D. 334 kJ/g
Q=mLf
Lf=enthalpy of fusion
3340/10=Lf
Lf=334J/g B
Enthalpy of fusion quantity of heat to convert 1 unit mass of a solid to liquid without any noticeable change in temperature.
The mass of 11.9 moles of chromium (Cr) is equal to 618.8 g.
A mole is a standard unit that is utilized to calculate a given count of particles. The particles counted are usually chemically identical entities, individually distinct.
A mole is used to calculate a huge number of quantities of atoms, molecules, ions, or other particular particles. The quantity amount of substance can be described as a measure of elementary entities of a given substance in a sample.
The number of units present in one mole is equal to 6.023 × 10 ²³ which is known as Avogadro’s constant.
Given, the number of moles of chromium = 11.9 moles
The mass of one mole of chromium = 52 g
Then, the mass of 11.9 moles of chromium = 11.9 × 52
The mass of 11.9 moles of chromium (Cr) = 618.8 g
Therefore, 618.8 grams is the mass of 11.9 moles of chromium (Cr).
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The reaction PCl5 + 4H2O -> H3PO4 + 5HCl involves 5 moles of HCl and 4 moles of water. Thus, for every mole of HCl produced, 0.8 moles of water is consumed. Hence, in this scenario, 2.76 moles of water would have been consumed to produce 3.45 moles of HCl.
In the balanced equation, PCl5 + 4H2O -> H3PO4 + 5HCl, you notice that 4 moles of water react with PCl5 to produce 5 moles of HCl. This means for every mole of HCl produced, 0.8 moles of water would have been consumed (4 moles / 5 moles).
So, if the reaction results in 3.45 moles of HCl, we can calculate the number of moles of water that reacted by multiplying the moles of HCl by 0.8. This gives us 2.76 moles of water.
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By creating a proportion based on the balanced chemical equation, it is determined that 2.76 moles of water reacted with PCl5 to produce 3.45 moles of HCl.
To determine how many moles of water reacted if 3.45 moles of HCl are produced, we refer to the balanced chemical equation:
PCl5 + 4H2O → H3PO4 + 5HClAccording to the equation, for every 5 moles of HCl produced, 4 moles of water are needed. Therefore, you can set up a proportion to calculate the moles of water:
Solving for x gives you the number of moles of water that reacted:
x = (3.45 moles HCl × 4 moles H2O) / 5Thus, x = 2.76 moles of H2O.
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Specialized cells are generally found only in multicellular organisms.
A multicellular organism can be described as an organism that contains more than one cell, in contrast to a unicellular organism. Multicellularity has been independently at least 25 times in eukaryotes and in some prokaryotes, like myxobacteria, cyanobacteria, and actinomycetes.
All species of animals, plants, and most fungi are multicellular organisms, whereas a few organisms are partially uni- and partially multicellular, such as slime molds and social amoebae.
Multicellular organisms develop in many ways such as by cell division or by aggregation of many single cells. Colonial organisms can be defined as identical individuals joining together to form a colony.
Unicellular organisms are divided, and the daughter cells failed to separate which results in a conglomeration of identical cells in one organism, which could develop specialized tissues.
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Answer:
Specialized cells are found only in multicellular organisms.
Explanation:
Or organisms are made up of more than one cell.
The question pertains to the concept of specific heat capacity. Using the formula 'q = mcΔT' where 'q' is the heat transferred, 'm' is the mass of the substance, 'c' is the specific heat and 'ΔT' is the temperature change, we can calculate how much heat a block of iron would release when it cools.
To solve your question, we need to understand the concept of specific heat capacity, which is an intensive property that depends only on the type of substance absorbing or releasing heat. The specific heat capacity (c) of a substance, commonly called its "specific heat," is the quantity of heat required to raise the temperature of 1 gram of the substance by 1 degree Celsius. The specific heat of iron is :
0.449 J/g°C
To calculate the amount of heat released, we need to use the formula for heat transfer as follows: q = mcΔT where:
In this case, the mass of iron is 1.49 kg or 1490 g, the specific heat capacity of iron is 0.449 J/g°C, and the change in temperature is 155°C - 22°C = 133°C.
By multipying these values in the formula we get: q = 1490g x 0.449 J/g°C x 133°C. Therefore, the block of iron would release calculated amount of Joules of heat as it cooled from 155°C to 22°C.
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b. The oxidation state is the rate of oxygen production.
c. The oxidation state is the number of electrons an atom or ion has gained or lost with respect to its neutral state.
d. The oxidation state is the rate at which a redox reaction approaches its charge neutrality.
Answer:
Ethyleneoxideisthechemicalagentsusedforsterilization.
Ethylene oxide is the chemical agent used for sterilization amongst those listed in the question. This gas sterilizes by disrupting the DNA of microorganisms. Other agents listed, such as chlorine, alcohol and phenolics are generally considered disinfectants, not sterilants.
Out of the chemical agents listed, ethylene oxide is the one commonly used for sterilization. Ethylene oxide is a gas that sterilizes by penetrating and disrupting the DNA of microorganisms, preventing them from reproducing. It is frequently used to sterilize medical and laboratory equipment, particularly items that cannot be sterilized by high heat such as plastic, electrical equipment, and delicate instruments.
While chlorine, alcohol, and phenolics can kill many microorganisms, they are generally considered disinfectants rather than sterilants because they may not kill all types of bacteria, viruses, fungi, and spores. Soap is typically used for cleaning, not specifically for its antimicrobial properties.
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