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amid [387]
3 years ago
10

A star is observed from two positions of Earth in its orbit, in summer and winter. Which of these is the best method to calculat

e the approximate distance of the star from Earth? measure the parallax and use it in calculations measure the red shift of emitted light and use it in calculations use doppler effect to calculate the shift in light traveling from star to Earth in winter use doppler effect to calculate the shift in light traveling from star to Earth in summer
Chemistry
1 answer:
Fantom [35]3 years ago
6 0

Answer:

D. Calculate the variations in the potions of the star due to movement of Earth in its orbit

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Why are prefixes not needed in naming ionic compounds?
Tasya [4]

Answer:

its A

Explanation:

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2 years ago
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What process does the equation represent?
svetoff [14.1K]

The answer is d.)  fission :)

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Ethyne gas combusts with oxygen gas according to the following reaction: Calculate the volume, in mL of CO2 produced when 73 g o
Bezzdna [24]

Answer: Volume of CO2 is 89127 mL

Explanation: The reaction that takes place is: C2H2 + O2 --> CO2 + H2O

The amount of C2H2 that react allow us to predict the amount of CO2 that will be obtained

mol CO2 = 73gC2H2 .\frac{1 mol C2H2}{26gC2H2} . \frac{2mol CO2}{4mol C2H2} = 5,6 mol CO2

26g/1mol is molar mass of C2H2 and 2/4 is the molar relation between CO2 and C2H2 in this reaction. Canceling units, at the end mol of CO2 are obtained

Now with the moles of CO2 and the ideal gases equation is possible to calculate the volumen occupied by the gas.

PV = RnT where P: pressure, V: volume, R: ideal gas constant, n: moles and T: temperature expressed in K (add 273,15 to °C temperature: 37,4°C + 273,15 = 310,55K)

V= RnT/P

V= \frac{0,08206 atmL/molK . 5,6 mol. 310,55 K}{1,6 atm}  =89,127 L

To express volume in mL multiply the L result by 1000 which equals 89127 mL

5 0
3 years ago
I neeeeeeeeed help you within 30 min
sladkih [1.3K]

Answer:

The answers to your question are given below

Explanation:

The equation for the reaction is given below:

2KClO₃ —> 2KCl + 3O₂

The total number of each atoms present in the reactants and products can be obtained by doing a head count as illustrated below:

Reactants >>>>>> Number of atoms

Potassium (K) >>> 2 × 1 = 2

Chlorine (Cl) >>>> 2 × 1 = 2

Oxygen (O) >>>>> 2 × 3 = 6

Products >>>>>>> Number of atoms

Potassium (K) >>> 2 × 1 = 2

Chlorine (Cl) >>>> 2 × 1 = 2

Oxygen (O) >>>>> 3 × 2 = 6

8 0
3 years ago
in carbon dioxide gas, the carbon atom forms two double bonds. what will the geometry of the bonds be
Fudgin [204]

Answer:

Linear geometry

Explanation:

  • In carbon dioxide, the carbon atom forms two double bonds. Each double bond is a group, hence there are two electron groups around the central atom.
  • <u><em>With two bonding pairs on the central atom and no lone pairs, the molecular geometry of CO2 is linear.</em></u>
  • The linear arrangement places the groups 180 degrees apart and it minimizes the repulsion in the molecule,
8 0
3 years ago
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