A 45.2 g sample of Silver at 101.0 ºC is dropped into 300.0 g of water at 30.6 ºC. What is the final temperature of the water?
Answer:
Final temperature of water = 31.2° C
Explanation:
Let the final temperature of water be T degrees
Concept: By energy conservation law
Heat lost by the silver = heat gained by water
Heat lost be silver Q1 = m1c1ΔT1
Q1 = 45.2/1000Kg×2.36J/KgK×(101-T)
Heat gained by water Q2 = m2c2ΔT2
Q2 = 300/1000Kg×4.186J/KgK(T-30.6)
Since, Q1=Q2
⇒ 45.2/1000Kg×2.36J/KgK×(101-T) = 300/1000Kg×4.186J/KgK(T-30.6)
Solving we get T = 31.2° C
Therefore, final temperature of water = 31.2° C
Mark drove 14 miles EAST and then 23 miles WEST. His displacement from where he started would be
Answer:
9 miles west
Explanation:
hope this helps
What is the frequency of an X-ray that has a wavelength of 1.5 x 10 -9 m? The speed of electromagnetic radiation is 3.0 x 10 8 m/s. [v = λƒ]
Answer:
2.0x10¹⁷ Hz is the frequency of the X-ray
Explanation:
We can find the frequency of a wave of energy from the wavelenght and its speed using the formula:
v = λƒ
Where v is speed (For electromagnetic radiation = 3.0x10⁸m/s)
λ is the wavelength in meters = 1.5x10⁻⁹m
And f is the frequency in s⁻¹ = Hz
Replacing:
3.0x10⁸m/s = 1.5x10⁻⁹m*ƒ
3.0x10⁸m/s / 1.5x10⁻⁹m = f
f =
2.0x10¹⁷ Hz is the frequency of the X-ray
What is the pOH of a solution with [OH-] = 1.4 x 10-13?
O A. -13.15
B. 14.00
C. 12.85
D. 13.15
Answer:
C. 12.85
Explanation:
just did
1.Peptide bond formation is accomplished as the amine nitrogen of the an-tRNA in the ____ carries out a _____ of the amino acid bound to the _____. a.A site, nucleophilic attack on the carbonyl carbon, tRNA of the P site b.P site, nucleophilic attack on the carbonyl carbon, tRNA of the A site c.A site, acidophilic attack on the carbonyl carbon, tRNA of the P site d.A site, electrophilic attack on the carbonyl carbon, tRNA of the P site e.P site, electrophilic attack on the carbonyl carbon, tRNA of the A site
Answer:
A
Explanation:
A site, nucleophilic attack on the carbonyl carbon, tRNA of the P site
what is the name of this molecule?
A. 2-pentyne
B. cis-2-pentene
C. 3-methylpentane
D. Pentane
As the compound has alkyne as the functional group the correct option is A.
Functional group is defined as a substituent or a group of atoms or an atom due to which chemical reactions are carried out. Each functional group will react in the same way regardless to the parent carbon chain to which it is attached.This helps in prediction of chemical reactions.
The reactivity of functional group is increased by making modifications in the functional group .Atoms that are present in functional groups are linked to each other by means of covalent bonds.They are named along with the organic compounds according to IUPAC nomenclature.
As the compound has alkyne as the functional group the correct option is A.
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Solution A: pH of 10
Solution B: pH of 7
Solution C: pH of 5
Which list has the solutions placed in order of increasing H+ concentration?
Answer:
I think it’s C,B,A
Explanation:
Bacteria live on skin of humans. The bacteria receive food and shelter form human beings. Most bacteria are harmless and pose little or no threat to humans. This is an example of
Answer: symbiotic relationship
Explanation:
How many moles of gallium chlorate, Ga(ClO3)3, must react in order to produce 674 kJ of energy according to the following reaction? 2 Ga(ClO3)3 à 2 GaCl3 + 9 O2 DH = - 130.4 kJ
Answer:
10.3 mol Ga(ClO₃)₃
Explanation:
Let's consider the following balanced thermochemical equation.
2 Ga(ClO₃)₃(s) ⇒ 2 GaCl₃(s) + 9 O₂(s) ΔH = - 130.4 kJ
According to the balanced thermochemical equation, 130.4 kJ of heat are released when 2 moles of gallium chlorate react. The number of moles of gallium chlorate that must react to produce 674 kJ of energy is:
674 kJ × 2 mol Ga(ClO₃)₃/130.4 kJ = 10.3 mol Ga(ClO₃)₃
Thermochemical equations are chemically balanced equations that take into account both the energy change and the physical states of all reactants and products. Energy is a reactant in an endothermic process, whereas it is a product in an exothermic reaction. Here the moles of Ga(ClO₃)₃ is 10.3 mol.
Let's consider the following balanced thermochemical equation.
2Ga(ClO₃)₃(s) ⇒ 2GaCl₃(s) + 9O₂(s) ΔH = - 130.4 kJ
According to the balanced thermochemical equation, 130.4 kJ of heat is released when 2 moles of gallium chlorate react. The number of moles of gallium chlorate that must react to produce 674 kJ of energy is:
674 kJ × 2 mol Ga(ClO₃)₃ / 130.4 kJ = 10.3 mol Ga(ClO₃)₃
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Which of the following is NOT a unit of energy?
a)joules
b)celsius
c)calories
d)kilocalorie
Answer:
Degree Celsius
____CO + ____H2 ----> ____C8H18 +____H2O
Select the correct structure that
corresponds to the name.
1,5,5-trichloro-2-pentyne
A. CICH2CH2C=CCH(CI)2
B. CICH2C=CCH2CH(CI)2
C. both
Answer:
Its (b)
Explanation:
After studying abroad in boston, I have discovered everything that there is to know about chemistry, and I have come to the conclusion that B is the correct answer.
[tex]CICH_2C=CCH_2CH(CI)_2[/tex] the correct structure that corresponds 1,5,5-trichloro-2-pentyne. Hence, option B is correct.
What is pentyne?The parent name of the alkyne comes from the IUPAC name for the alkane of the same number of carbon atoms, except the ‐ ane ending is changed to ‐ yne to signify the presence of a triple bond.
[tex]CICH_2C=CCH_2CH(CI)_2[/tex] the correct structure that corresponds 1,5,5-trichloro-2-pentyne.
Hence, option B is correct.
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The estimate obtained from a sample of which size is likely to be closest to
the actual parameter value of a population?
O A. 15
B. 30
C. 85
D. 50
the closest value is C, 85.
hope it helps!!!!
85 is the estimate value that is obtained from a sample of which size is likely to be closest to the actual parameter value of a population. Therefore, the correct option is option C.
What is population?A population is the entire set of people in a group, whether that group is a country or a collection of people who share a certain trait. A population is the group of people where a statistical sample has been collected in statistics. Hence, a population is any collection of people who have something in common.
A statistically substantial chunk of a population, rather than the full population, may also be referred to as a sample. For this reason, the standard deviation, meaning standard error, of a statistical study of a sample from the full population must be disclosed. Only a population-wide analysis would have zero standard deviation. 85 is the estimate value that is obtained from a sample of which size is likely to be closest to the actual parameter value of a population.
Therefore, the correct option is option C.
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A scientist is measuring the pressure that is exerted by each of the following gases in the atmosphere: carbon dioxide,
oxygen, and nitrogen. Which term most likely describes what she is measuring?
O final pressure
O atmospheric pressure
O combined pressure
O partial pressure
Answer:
D. Partial pressure
Explanation:
Partial pressure is the individual pressure exerted by each gas present in a gaseous mixture. As he is measuring the pressure of each gas in the atmosphere separately, so PARTIAL PRESSURE is the exact term for his measurement.
At STP what is the density of a gas that has a gram molecular mass of 32 grams?
Answer:1.4 g/L
Explanation:
One mole of very substance at STP contains a volume of 22.4 liters. Density can be found by dividing the mass by volume . The density of the gas with a molecular mass of 32 grams is 1.42 g/l.
What is density?Density of a substance is the measure of its mass per volume. It represents how much denser it is in a given volume. Density depends on the molecular weight, bond type, volume, temperature and pressure.
STP is defined as the condition of standard temperature and pressure. 293 K and 1 atm pressure are considered to be the standard conditions. At STP, the volume of one mole of every substances contains 22.41 liters.
It is given that the molecular weight of the gas is 32 g/mol. Thus its density in one mole can be calculate as follows:
Density = mass/ volume.
= 32 g/ 22.4 L
= 1.42 g/L.
Hence, the density of the gas at STP with molecular mass of 32 g is 1.42 g/L.
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7. Which type of electromagnetic radiation can be dangerous to living things?
a. Radio waves
b. Visible light
c. Gamma rays
Which type of reaction does an element replace an ion in a compound, forming a new compound and new element?
a
Synthesis
b
Decomposition
c
Single Replacement
d
Double Replacement
e
Combustion
Answer:
The answer is c . Single Replacement
Explanation:
A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound.
HELPPPP ASAPP 10 POINTS
5 points
How many moles are in 3.5 L solution with a concentration of 2.5 M?
O 8.75 moles
O .71 moles
1.4 moles
help me with bellwork
Answer:
1. PE
2. KE
3. PE
4. KE
5. KE
6. PE
7. KE
8. KE
9. PE
10. PE
Explanation:
Think about it this way, potential energy is stored energy while kinetic energy is active energy.
Complete the nuclear reaction.*
[tex] \boxed {_{-1}^0e} [/tex]
Explanation:
[tex]\huge _{53}^{125}I\rightarrow _{54}^{125}Xe+\boxed {_{-1}^0e} [/tex]
A nebula is often made up of hydrogen and helium gases.
True
False
Answer:
Nebulae are made of dust and gases—mostly hydrogen and helium. ... Eventually, the clump of dust and gas gets so big that it collapses from its own gravity. The collapse causes the material at the center of the cloud to heat up-and this hot core is the beginning of a star.
Explanation:
Hope this helps
2A1 (s) + 3C12 (g) --> 2AlCl3 (s) (balanced)
When 72 grams of aluminum react, the actual yield is 125.5 grams, what is the percent yield?
i got a few mins left
Answer:
32.3%
Explanation:
Percent yield is defined as:
Actual yield (125.5g) / Theoretical Yield * 100
To find theoretical yield we have to find the moles of aluminium. As 2 moles of Al produce 2 moles of AlCl3, the moles of Al = Moles AlCl3.
With these moles we can find the mass assuming a 100% of yield (Theoretical Yield) as follows:
Moles Al = Moles AlCl3 (Molar mass Al = 26.98g/mol)
72g Al * (1mol / 26.98g) = 2.67 moles AlCl3
Mass AlCl3 (Molar mass: 133.34g/mol)
2.67 moles AlCl3 * (133.34g / mol) = 355.8g AlCl3
Percent Yield = 125.5g / 355.8g * 100 =
32.3%Which of the following statements is FALSE? *
a.Smog is a phenomenon brought about by natural events.
b.Forest fires may be caused by human activities or by natural events.
c.Volcanic eruptions may contribute large amounts of pollutants to the atmosphere.
d.Under normal condition, the greenhouse effect maintains a temperature that support life on Earth.
Answer:
A:smog is a phenomenon brought about by natural events
Explanation:
false because of how phenomenon it is smog did not bought phenomenon and natural events!!
DOES THIS HELPFUL?
If you want 370 mL of 2.3 M AgNO3 solution, how many grams of AgNO3 do you need?
dont use that link its bad
Which term is used to describe the maximum amount of a product that can be produced by a given amount of reactant? (5 points) a Catalytic reactant b Excess reactant c Limiting reactant d Theoretical yield
Answer:
d Theoretical yield
Explanation:
I took the test :)
Theoretical yield term is used to describe the maximum amount of a product that can be produced by a given amount of reactant
What is Theoretical yield?The theoretical yield is just the maximum mass of a product that a chemical reaction can produce.
Theoretical yield the amount of product produced by a perfect (theoretical) chemical reaction, not the amount that will receive from a laboratory reaction. The balanced chemical equation can be used to calculate theoretical yield, the limiting reactant's mass and relative formula mass, as well as the product's relative formula mass.
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proper significant figure: 27.01 + 14.369
Answer:
put the bigger number on top then addExplanation:
41.369
What is the pOH of a solution that has a pH of 2
Hey guys, about to submit my draft for business and chemistry.
What are some things I can do to spice it up and make it better (little adjustments) that can have a big impact when the teacher is reading it?
Answer:
so u can put on hot sauce to spice it up
and give it to ur teacher
It's fruitfull to add some more information and some acquired knowledge...
Hope it is helpful !
what is zinc chemical formula?
Answer:
Zn+2
Explanation:
I'm sorry if its wrong but have a good one!