how did the occurrence of the supernova help support galileo's view that earth was not the center of the universe

1 answer:

3 0

The supernova of 1604 was observed in Padua on 10 October 1604 but on account of cloudy weather Galileo did not see it until a few days later. The supernova created great excitement and Galileo, who taught mathematics and astronomy at the University, was asked to give three public lectures that were attended by a large audience. In this paper we show how Galileo explained the nature of parallax in order to demonstrate that the new star was well beyond the Moon. We also consider his attempt to determine the nature of the star, and the amusing pamphlet that he penned to lampoon professional philosophers who denied that new stars could appear in the heaven
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A student performs a titration on 25.0 mL of 0.500M HCL(aq) which is placed in an Erlenmeyer flask. Two drops of indicator are a

Leviafan [203]

Answer:

The unknown NaOH base has a concentration of 0.636M

Explanation:

Step 1: the balanced equation

NaOH + HCl → NaCl + H2O

This means for 1 mole of NaOH consumed there is 1 mole of HCl needed to produce 1 mole of NaCl and 1 mole of H2O

Step 2: Calculate moles of HCl used

Number of moles = Concentration * volume = 0.5M * 25*10^-3 L =0.0125 moles

Step 3: Calculate moles of NaOH

Since the mole ratio for HCl and NaOH is 1:1 this means we have 0.0125 moles of NaOH for 0.0125 moles of HCl

Step 4: Calculate Concentration of the unknown NaOH base

Concentration = Number of moles / Volume

Volume of NaOH = 24.64-5 =19.64 mL = 0.01964 L

Concentration = 0.0125/0.01964 = 0.636 M

The unknown NaOH base has a concentration of 0.636M

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3 years ago

How many moles of oxygen are necessary to completely react with propane (C3H8) to produce 16.3 mol of water according to the fol

velikii [3]

The balanced chemical reaction is expressed as:

C3H8 + 5 O2 -> 3 CO2 + 4 H2O

We are given the amount of water produced. We use this amount for the calculations. We do as follows:

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Hope this answers the question. Have a nice day.

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Fiesta28 [93]

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matrenka [14]

Answer:
The pressure increases to 3.5 atm.

Solution:
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For initial and final states of a gas the equation is,

P₁ / T₁ = P₂ / T₂
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Data Given;
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Putting values in eq. 1,

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garik1379 [7]

Is reaction a choice?

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