1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
bezimeni [28]
2 years ago
10

How is an echo formed?

Chemistry
2 answers:
mojhsa [17]2 years ago
5 0

Answer: B

Explanation: echos cannot be made from light waves so C and D are out, and sound waves cannot travel into a surface. Also echos is sound waves bouncing that’s why in an empty room without furniture there’s an echo.

Finger [1]2 years ago
3 0

Answer:

It is none. Echo is formed when sound waves hit a hard surface.

Explanation:

You might be interested in
Identify the correct net ionic equation for the reaction that occurs when solutions of Pb(NO3)2 and NH4Cl are mixed.
Pie

Answer:

Pb2+(aq) + 2Cl–(aq) ----> PbCl2(s)

Explanation:

The net ionic equation shows the main reaction that takes place in a system. Hence, a net ionic equation focusses only on those species that actually participate in the reaction.

For the reaction between Pb(NO3)2 and NH4Cl , the net ionic equation is;

Pb^+(aq) + 2Cl^-(aq) ---> PbCl2(s)

7 0
3 years ago
In which material are the particles arranged in a regular geometric pattern?
Illusion [34]
 I think only solids arrange in a regular geometric pattern, so i2
6 0
3 years ago
Prove how the Law Conservation of Mass and Enery apply to Cellular Respiration​
snow_lady [41]

Answer:

mass and energy is reused when those things happen

7 0
3 years ago
Do all colors of light have the same energy?
icang [17]
No, darker colors like purple and blue have higher wave frequency which transmit more energy.
6 0
3 years ago
Which of the following below is the complete ionic equation of the reaction: Calcium nitrate and sodium sulfide solutions react
3241004551 [841]

To find the net ionic equation we must first write the balanced equation for the reaction. We must bear in mind that the reagents Ca(NO3)2 and Na2S are in the aqueous state and as product we will have CaS in the solid state, since it is not soluble in water and NaNO3 in the aqueous state.

The balanced equation of the reaction will be:

Ca(NO_3)_{2(aq)}+Na_2S_{(aq)}\rightarrow CaS_{(s)}+2NaNO_{3(aq)}

Ca(NO3)2(aq) + → Ca(aq) + 2Na(s)NO3Now, c(aq)ompounds in the aqueous state can be written in their ionic form, so the reaction will transform into:Na2S +

Ca_{(aq)}^{2+}+2(NO_3)_{(aq)}^-+2Na_{(aq)}^++S_{(aq)}^{2-}\operatorname{\rightarrow}CaS_{(s)}+2Na_{(aq)}^++2NO^-_{3(aq)}

So, the answer will be option A

5 0
1 year ago
Other questions:
  • The small intestine shown below contains lymphatic vessels but no capillaries. Which nutrient will be absorbed by this small int
    11·2 answers
  • For the reaction A+B+C→D+E, the initial reaction rate was measured for various initial concentrations of reactants. The followin
    7·1 answer
  • The most common carbonate rock is A) dolomite. B) halite. 35) C) limestone. D) calcite.
    13·1 answer
  • In electroplating, how should the object that will be plated be connected in the electrolytic cell?
    7·1 answer
  • Which of the following is not true in regard to noble gases? A. These elements have full outermost shells. B. These elements are
    11·2 answers
  • PLSSS help with this question ​
    10·2 answers
  • 11. If two substances react and the temperature of the mixture decreases, the reaction
    5·1 answer
  • The density (g/L) of CO2 gas at STP ( 273 K, 1.00 atm) is
    7·1 answer
  • Water molecules tend to be ________ because they are held together by __________ bonds.
    6·1 answer
  • Draw the structure of the product formed when HBr reacts with 2‑methyl‑2‑butene or 2‑methylbut‑2‑ene in the presence of organic
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!