Answer:
A) The acceleration due to gravity for any object, including 1 washer on the string, is always assumed to be 10 m/s2.
B) The mass of 3 washers, when converted to kg, is 0.0147 kg.
C) The applied force of 3 washers will increase the applied force on the car to 0.147 N.
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Answer:
physical
Explanation:
The zinc (which was already silver) coated the penny. The NaOH dissolved the zinc. (that was what made the water murky) And small pieces of zinc adhered to the penny (coated) It was a physical change because no NEW color was created.
Answer:
The pressure in the container is 52.2 atm
Explanation:
Step 1: Data given
Volume of container = 250 mL = 0.250 L
Mass of oxygen gas (O2) = 16.00 grams
Temperature = 45.0 °C = 318.15 K
Molar mass of oxygen gass = 32.0 g/mol
Step 2: Calculate the moles of oxygen gas
Moles O2 = mass O2 / molar mass O2
Moles O2 = 16.00 grams / 32.00 g/mol
Moles O2 = 0.500 moles
Step 3: Calculate the pressure in the container
p*V = n*R*T
⇒with p = the pressure of the oxygen gas = TO BE DETERMINED
⇒with V = the volume of the container = 0.250 L
⇒with n = the moles of O2 gas = 0.500 moles
⇒with R = the gas constant = 0.08206 L*Atm/mol*K
⇒with T = the temperature = 318.15 K
p = (n*R*T)/V
p = (0.500 mol * 0.08206 L*atm/mol*K * 318.15 K) / 0.250 L
p = 52.2 atm
The pressure in the container is 52.2 atm
Answer:
14. B 15. D 16. C 17. B
Explanation:
The spontaneous reaction that occurs when the cell operates is shown below:
⇒
We need to select the correct option from the list below for the following questions.
(A) Voltage increases. (B) Voltage decreases but remains > zero. (C) Voltage becomes zero and remains at zero. (D) No change in voltage occurs. (E) Direction of voltage change cannot be predicted without additional information.
14. A 50-milliliter sample of a 2-molar solution is added to the left beaker.
If a 50-milliliter sample of a 2-molar solution is added to the left beaker, the voltage decreases but its value remains greater than zero. The correct option is B
15. The silver electrode is made larger.
If the silver electrode is made larger, no change in the value of the voltage since we don't have the idea of the initial value. The correct option is D.
16. The salt bridge is replaced by a platinum wire.
If the salt bridge is replaced by a platinum wire, there will be no passage of electrons because electrons can't pass through a platinum wire. Therefore, the voltage will be zero and remains at zero. The correct option is C.
17. Current is allowed to flow for 5 minutes.
If current is allowed to flow for 5 minutes, the voltage decreases but its value remains greater than zero. The correct option is B.