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Gala2k [10]
3 years ago
8

What new evidence led scientists to change their minds about the geocentric model?

Chemistry
1 answer:
IRISSAK [1]3 years ago
3 0

Galileo disproved the Ptolemaic theory, sanctioned for centuries by the Church, which held the Earth to be the central and principal object in the universe, about which all celestial objects orbited.

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What is the number of millimoles of H+ in 1.653 mmol of oxalic acid dehydrate?Remember that oxalic acid is diprotic.
Anastaziya [24]

Answer: 3.306 mmol

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

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

where,

Molarity

n= moles of solute  

V_s = volume of solution in ml

C_2O_4H_2.2H_2O\rightarrow C_2O_4^{2-}+2H^++2H_2O

According to stoichiometry:

1 mole of C_2O_4H_2 gives 2 moles of H^+

1.653 mmol of C_2O_4H_2 gives =\frac{2}{1}\times 1.653=3.306mmo of H^+

Thus number of millimoles of H^+ are 3.306

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3 years ago
HELP PLEASE ILL GIVE 25 pointsWhich of the following practices could help reduce erosion of water banks? a. buffer strips b. nat
o-na [289]

Answer:A

Explanation:

4 0
4 years ago
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I need help with my chemistry homework. SHOW WORK
AysviL [449]
<h2>d=density, m=mass, v=volume</h2>

1. 17.2kg=17200g

so knowing that d=m/V, use V=m/d to calculate the volume

v=17200/5.75

and then devide by 1000 to convert cm3 to dm3 and the answer will be in dm3

2. d=m/v

v=0.5l

m=425g

so use the formula and you will get d=425/0.5=850g/l

3. use d=m/v again, but not before rewriting the formula for volume: m=vd and  convert dm3 to cm3

1dm3=1000cm3

so 0.987dm3 =987 cm3

now m=987cm3 * 10.5g/cm3 and the answer will be in grams

6 0
3 years ago
Indicator paper can be used to measure the _________________ of a solution. indicators are substances that are different _______
Ede4ka [16]

sorry, but im just learning some chemistry myself so i only know that the 1st blank is: Ph

hope you can find what the other 2 blanks are

3 0
3 years ago
The flask contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.200 M NaOH. It requires 14.
iren2701 [21]

M₁V₁=M₂V₂

M₁ x 10 = 0.2 x 14

M₁ = 0.28

7 0
2 years ago
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