CHEMISTRY HIGH SCHOOL

Hunter wants to measure the weight of a dumbbell.he should A. use a beaker with water and record the weight in N.
B. use a scale and record the weight in CM.
C.use a beaker with water and record the weight in CM.
D. use a scale and record the weight in N.

Answers

Answer 1
Answer: He should use a scale and record the weight in N. The beaker is used for liquid measurement and the scale is used for measuring sold things. A dumbbell is not a liquid material that is why the need of the scale will give it the accurate measurement that Hunter wants to know.
Answer 2
Answer:

Answer:

use a scale and record the weight in N.

Explanation:

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If a substance goes from the gas phase to the liquid phase, was it heated or cooled

Answers

when a substance goes from 1 state of matter to a another state of matter, the process is a change of state. What i found out is that it can be heated, whenever the substance goes to another phase i mostly heard, and reasearched that it goes to heated.

Formed when chemicals in the air get into rain and up the acidity levels

Answers

Acid Rain is formed when chemicals in the air get into rain and up the acidity levels!!!!!!

Hope this helps guys!

Answer:

yes acid rain

Explanation:

Most metals are in the liquid state at room temperature.

Answers

that statement is False.

Most metals are in the solid state at room temperature. The only metal that is in liquid state in the room temperature is Mercury, (Hg)

Which equation is a decomposition reaction?a. Li2CO3 ---> Li2O + CO2

b. Zn + HCl ---> ZnCl2 + H2

c. Na2O + CO2 ---> Na2CO3

d. C6H12O6 + O2 ---> CO2 + H2O


please help asap

Answers

Answer : (a) Li_2CO_3\rightarrow Li_2O+CO_2 is a decomposition reaction.

Explanation :

(a)Li_2CO_3\rightarrow Li_2O+CO_2 is a decomposition reaction.

  • Decomposition reaction : It is a type of chemical reaction in which a single compound decomposes into two or more compounds.

(b)Zn+2HCl\rightarrow ZnCl_2+H_2 is a displacement reaction.

  • Displacement reaction : It is a type of reaction in which a most reactive element displaces the least reactive element in a compound.

(c)Na_2O+CO_2\rightarrow Na_2CO_3 is a combination reaction.

  • Combination reaction : It is a type of reaction where two or more compounds combine to form a single compound.

(d)C_6H_(12)O_6+6O_2\rightarrow 6CO_2+6H_2O is a combustion reaction.

  • Combustion reaction : It is a type of reaction where a hydrocarbon react with the oxygen to produced carbon dioxide and water.

Therefore, option (a) is a decomposition reaction.
The reaction in which reactant breaks down into more than one constituents is called decomposition reaction. So option A. Li2CO3 ---> Li2O + CO2  is correct. 

student has calibrated his/her calorimeter and finds the heat capacity to be 14.2 J/°C. S/he then determines the molar heat capacity of aluminum. The data are: 25.5 g Al at 100.0°C are put into the calorimeter, which contains 99.0 g H2O at 18.6°C. The final temperature comes to 22.7°C. Calculate the heat capacity of Al in J/mol·°C.

Answers

Answer:

24.03 J/mol.ºC

Explanation:

For a calorimeter, the heat lost must be equal to the heat gained from water plus the heat gained from calorimeter, which has the same initial temperature as the water.

-Qal = Qw + Qc (minus signal represents that the heat is lost)

-mal*Cal*ΔTal = mw*Cw*ΔTw + Cc*ΔTc

Where m is the mass, C is the specific heat, ΔT is the temperature variation, al is from aluminum. w from water and c from the calorimeter. Cw = 4.186 J/gºC

-25.5*Cal*(22.7 - 100) = 99.0*4.186*(22.7 - 18.6) + 14.2*(22.7 - 18.6)

1971.15Cal = 1699.10 + 58.22

1971.15Cal = 1757.32

Cal = 0.89 J/g.ºC

The molar mass of Al is 27 g/mol

Cal = 0.89 J/g.ºC * 27 g/mol

Cal = 24.03 J/mol.ºC

How many milliliters of hydrogen gas are produced by the reaction 0.020 mol of magnesium with excess of hydrochloric acid at STP?

Answers

The reaction of magnesium and hydrochloric acid is a single displacement reaction. The reaction is expressed as Mg + 2HCl= MgCl2 + H2. There is a one is to one correspondence of Mg and H2. Hence there is also 0.02 mol of H2. Using PV=nRT where T is 273 K, P is 1 atm and R is 0.0821 L atm/mol K, volume is equal to 0.4483 L or 448.3 mL.

Answer: The answer is D

Explanation:
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