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pashok25 [27]
3 years ago
11

If you know the mass of an object you can calculate its weight with the formula

Chemistry
1 answer:
Vikki [24]3 years ago
3 0
Answer: True

The formula of weight is w = mg, where m is the mass and g is the acceleration of gravity. If you want to calculate an object's weight, you need to know the two components: mass and gravity. 

You only need to know the mass of the object because the acceleration of gravity is ALWAYS (assuming the object is on Earth) 9.8 m/s^2. 
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Phoenix [80]

Answer: A: PbCl2

Hope dis helps!

8 0
3 years ago
What is the total amount of heat released when 94.0 g water at 80.0 °C cools to form ice at −30.0 °C?
Wewaii [24]

Answer:

The total amount of heat released  is  68.7 kJ

Explanation:

Given that:

mass of water = 94.0 g

moles of water = 94 / 18.02 = 5.216

80⁰C   ------>  0⁰C  -------->    -30⁰C

Q1 = m Cp dT

      = 94 x 4.184 x (0 - 80)

     = -31463.68 J

     = -31.43 kJ

Q2 = 6.01 x 10^3 x 5.216

    = - 31348.16 J

   = -31.35 kJ

Q3 = - 94 x 2.09 x 30

    = - 5893.8 J

   = -5.894 kJ

Total heat = Q1 + Q2 + Q3  = -31.43 kJ  + (-31.35 kJ  ) + (-5.894 kJ )  = -68.7 kJ

Total heat released = -68.7 kJ

Note that the "negative sign" simply indicates heat released, therefore no need to put it in the answer.

6 0
3 years ago
Identify the type of error in the following scenario. SCENARIO: A group is trying to find the volume of a given liquid. To do th
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Answer:

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5 0
3 years ago
Chemical bonds are likely to form when_____
Viefleur [7K]

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Explanation:

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Protozoan infection is not likely to be transmitted by:
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Hi! 

The answer is breathing.

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Breathing
is not considered to be likely to transmit protozoan infection because protozoans rarely develop in the respiratory tract.
6 0
3 years ago
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