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erica [24]
3 years ago
5

A combination reaction occures when one element replaces another element in a compound during a chemical reaction

Chemistry
1 answer:
PIT_PIT [208]3 years ago
5 0
That is false.... I hope this is true or false
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Describe the atomic theory of atoms. How does this help us understand differences the three states of matter?
postnew [5]

1) Everything is made up of atoms. 2)Atoms are indivisible and also undestroyable. 3) The combination of 2+ different kinds of atoms creates compounds 4) A chemical reaction happens when atoms are rearranged/moved around.

4 0
2 years ago
Both a siren passing by and radar exhibit the Doppler effect. What is the main
Gemiola [76]

Answer:

D. Radar uses radio, and the siren uses sound waves.

Explanation:

The main difference between the siren passing by and the radar is that radar uses radio waves and siren uses sound waves.

  • Sound waves are mechanical waves which requires a material medium for their propagation.
  • In a vacuum, the sound waves cannot pass through freely.
  • Radar is an electromagnetic wave.
  • It is particular of radio waves origin.
  • Such waves do not require a material medium for their propagation and hence can be transmitted through a vacuum.
5 0
3 years ago
Read 2 more answers
Josh drives her scooter 7 km north. she stops for lunch and then drives 5 km east. what distance does she cover? what was her di
weqwewe [10]

Explanation:

Find the motion diagram attached for the illustration:

Distance is the length of path traveled from the start to the finish. In measuring distance, we wall through the path from start to the finishing point. Distance is a scalar magnitude that has magnitude but no direction.

Displacement is distance that is taken between the start and finishing point. It is a vector quantity that has magnitude and measures direction.

To find the distance;

Distance = 5km + 7km = 12km

Displacement:

 Using pythagoras theorem;

   Displacement = √7² + 5² = 8.6km

 Direction:

    sin(bearing ) = \frac{5}{8.6}  = 0.5814

   bearing = arcSin 0.5814 = 035.6°

Displacement is 8.6km in a direction 035.6°

learn more:

Displacement brainly.com/question/6123316

#learnwithBrainly

6 0
2 years ago
At 1023 K and 1 atm, a 3.00 gram sample of Snoz(s) (gram-formula mass = 151 g/mol) reacts with hydrogen gas to produce tin and w
Blizzard [7]

Answer:

2 moles of Sn are produced when 4 moles of H2(g) are consumed completely

Explanation:

to determine the number of moles of sn (l) produced when 4.0 moles of H2 (g) is consumed completely.

First, find the number of moles of H2 consumed by taking this as limiting reagent.

                                           n = \frac{g}{M.W (g/mol)}

Then find the moles of Sn (l) taking into account the stoichiometric relationship between H2(g) and Sn(l). 2:1

                          SnO_{2} (s) + 2H_{2}(g)  ⇒  Sn(l) + 2H_{2}O(g)

                              mol Sn(l) = \frac{1mol Sn}{2mol H_{2} } . 4 mol H_{2} = 2  mol

∴2 moles of Sn are produced when 4 moles of H2(g) are consumed completely.

4 0
2 years ago
Which is a physical change?
kotykmax [81]

Answer: Strawberries liquefied in a blender

Explanation:

3 0
3 years ago
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