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Verizon [17]
3 years ago
6

What did Democritus think that matter was made of?

Chemistry
1 answer:
soldi70 [24.7K]3 years ago
5 0
Democritus believed matter was made up of small particles. He introduced the idea of the atom
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Enthalpy is the change in energy. A cold pack will react endothermically and enthalpy will be positive and a heat pack will have negative enthalpy. You cannot determine which has more change in enthalpy unless you measure the temperature change. Eg. a heat pack went from 25c to 35c will have greater change in enthalpy then a cold pack going from 25 to 20c because the net temperature difference is greater
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Jailah needs a replacement for lithium for a science experiment. She tries silicon, but it does not work. Using what you know ab
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3. Two people are playing tug of war. One person pulls to the right with 32 N of force. The other person pulls to the left with
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The net force = -5 N

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<h3>Further explanation </h3>

Net force : the sum of all forces acting on an object

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The direction of the force (horizontal motion) is to the right (+32 N), and to the left (-37 N), so the net force :

\tt \sum F=F~right-F~left\\\\\sum F=32-37\\\\\sum F=-5~N

5 0
2 years ago
A student needs to prepare 100. mL of 0.612 M Cu(NO3)2 solution. What mass, in grams, of copper(II) nitrate should the student u
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Answer: 11.5 grams

Explanation:

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Molarity=\frac{n\times 1000}{V_s}

where,

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n= moles of solute  

V_s = volume of solution in ml = 100 ml

Now put all the given values in the formula of molarity, we get

0.612=\frac{n\times 1000}{100ml}

n=0.0612moles

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Therefore, the mass of copper (II)nitrate required is 11.5 grams

3 0
3 years ago
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