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Diano4ka-milaya [45]
3 years ago
10

What must be true for a car to move forward at a constant speed? The forward fore of the car is....?

Chemistry
1 answer:
4vir4ik [10]3 years ago
4 0
Constant. you have to continuously apply the same amount of force to achieve constant velocity 
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Answer:

1)Around 450 B.C., the Greek philosopher Democritus introduced the idea of the atom.

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An ionic bond will form between ?​
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5 0
3 years ago
Read 2 more answers
How many molecules of CaCl2 are equivalent to 75.9 g CaCl2
sergij07 [2.7K]
First, you need to find:
One mole of CaCl_{2} is equivalent to how many grams?

Well, for this you have to look up the periodic table. According to the periodic table:
The atomic mass of Calcium Ca = 40.078 g (See in group 2)
The atomic mass of <span>Chlorine Cl = 35.45 g (See in group 17)
</span>
As there are two atoms of Chlorine present in CaCl_{2}, therefore, the atomic mass of CaCl_{2} would be:

Atomic mass of CaCl_{2}  = Atomic mass of Ca + 2 * Atomic mass of Cl

Atomic mass of CaCl_{2} = 40.078 + 2 * 35.45 = 110.978 g

Now,

110.978 g of CaCl_{2} = 1 mole.
75.9 g of CaCl_{2} = \frac{75.9}{110.978} moles = 0.6839 moles.

Hence,
The total number of moles in 75.9g of CaCl_{2} = 0.6839 moles

According to <span>Avogadro's number,
1 mole = 1 * </span>6.022 * 10^{23} molecules
0.6839 moles = 0.6839 * 6.022 * 10^{23} molecules = 4.118*10^{23} molecules

Ans: Number of molecules in 75.9g of  CaCl_{2} =  4.118*10^{23} molecules

-i


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2 years ago
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How to solve 5 and 6
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Check the picture, I balanced the ions with greater charges first, then I balanced the water last

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