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3 years ago

Both a siren passing by and radar exhibit the Doppler effect. What is the main

Chemistry

2 answers:

Gemiola [76]3 years ago

5 0

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.

Likurg_2 [28]3 years ago

3 0

Answer: c is the correct answer

Explanation:

I’m smrt

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A sample of matter was given the following description: The sample of the pure substance is blue in color with an octahedral sha

Alexeev081 [22]

Answer:

A crystalline solid

Explanation:

Most solids form with a regular arrangement of their particles because the overall attractive interactions between particles are maximized, and the total intermolecular energy is minimized, when the particles pack in the most efficient manner. The regular arrangement at an atomic level is often reflected at a macroscopic level. Liquids dont use to have this kind of arrangements or shapes.

5 0

3 years ago

What is the theoretical yield of sodium oxide (Na₂O) in grams when 20.0g of calcium oxide (CaO) reacts with an excess amount of

ad-work [718]

Answer:

22.1g

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

CaO + 2NaCl —> Na2O + CaCl2

Next, we shall determine the mass of CaO that reacted and the mass of Na2O produced from the balanced equation.

This is illustrated below:

Molar mass of CaO = 40 + 16 = 56g/mol

Mass of CaO from the balanced equation = 1 x 56 = 56g

Molar mass of Na2O = (23x2) + 16 = 62g/mol

Mass of Na2O from the balanced equation = 1 x 62 = 62g

From the balanced equation above,

56g of CaO reacted to produce 62g of Na2O.

Finally, we can determine the theoretical yield of Na2O as follow:

From the balanced equation above,

56g of CaO reacted to produce 62g of Na2O.

Therefore, 20g of CaO will react to produce = (20 x 62)/56 = 22.1g of Na2O.

Therefore, the theoretical yield of Na2O is 22.1g

6 0

3 years ago

Read 2 more answers

Choose a generic equation showing how a weak base ionizes water.

FinnZ [79.3K]

Hi!

The generic equation showing how a weak base ionizes water is the following:

B(aq) + H₂O(l) ⇄ BH⁺(aq) + OH⁻(aq)

A base is described as weak when its dissociation is difficult and isn't complete. Weak Bases are chemical compounds that accept protons from water, to form the conjugate acid and the OH⁻ ion. The pH of the solution of a weak base is higher than 7. Some weak bases include ammonia (NH₃), Aluminum Hydroxide (Al(OH)₃) and Sodium Acetate (CH₃COONa).

Have a nice day!

4 0

3 years ago

A geologist finds a mineral sample alongside a swift flowing river. She determines the mineral is a type of Quartz. Which is tru

Minchanka [31]

I would say d or b sorry im not that good

8 0

3 years ago

Read 2 more answers

An organic synthesis to make the pain reliever acetaminophen is supposed to produce 280 kg of product but instead produces 70 kg

Irina-Kira [14]

Answer: 75%

Explanation:

The following information can be gotten from the question:

Waste = 70kg

Theoretical yield = 280kg

Therefore, the actual yield will be the difference between the theoretical yield and the waste which will be:

= 280kg - 70kg = 210kg

The percent yield will now be:

= Actual yield / Theoretical yield × 100

= 210/280 × 100

= 3/4 × 100

= 75%

4 0

3 years ago