Describe what happens inside a CD
player when you listen to an audio CD.

The thing that happens inside a CD player when you listen to an audio CD is that laser beam turns on and scans along a track with the photocell from the CD's center.

The electrical conductivity of a semiconductor material is between that of a conductor, such as metallic copper, and that of an insulator, such as glass.

A small photoelectric cell and a smaller laser beam (called a semiconductor diode laser) are found inside your CD player (an electronic light detector). When you hit play, the disc is rotated at a high speed by an electric motor (not visible in this figure) (up to 500rpm).

The laser beam turns on and scans along a track with the photocell from the CD's center to its edge (in the opposite way to an LP record). As the laser/photocell scans from the center to the periphery of the disc, the motor gradually slows it down (as the track number increases, in other words).

Hence laser beam turns on and scans along a track with the photocell from the CD's center.

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If the mass of the products of a chemical reaction was 100 g, what was
the mass of the reactants? Explain. -

Convert from: 689 m =____mm*

(Metric Conversion chart)

A. 68,900 mm
B. 689,000 mm
C. 0.689 mm
D. 0.000689 mm​

how do we make our natural resources last for generations to come?

The specific heat of liquid H2O is 4.184 J/g°C. If 32.7 grams of water are heated from
12 °C to 77 °C, how much energy is required?

Look at picture
ASAP please will mark as brainlist don’t got much time

Choose the words or phrases that correctly complete the paragraph.

Mia decided to research the hydrosphere for a class project. She is focusing on the ways the ocean varies in salinity, temperature, and depth. As you descend into the ocean, the water temperature
Choose-increases, heats,lose force,decreases(for both)
, while the water pressure
Choose...
.

Under what conditions would pressure affect the reaction rate?
O A. If the reaction requires the use of a catalyst
B. If the reaction takes place between a solid and a liquid
C. If the reaction is between two liquids
O D. If the reaction occurs in the gas phase

What is the compound name for Bel?

Something that helps us to understand things that are too large or too small are called A. atoms B. molecules C. models D . compounds

Is warm water or cold water more dense

BCL PART
<
10 of 25
Fill in the coefficients with the correct numbers to create a balanced equation,
Al + _ Brg _M1Brz
0 1,21
2,3,2
4,6,4
34,3

advantages of solar energy

PLS HELP ASAP Solar energy causes most of the water ___________________ on Earth’s surface?

please help me on this question

CuCl2 + NaNO3 -------> Cu(NO3)2 + NaCl

How many atoms are in 100g H2O ?

please help im failing

Energy in a chemical reaction can be identified as which of the following?

A.) Heat
B.) Light
C.) ∆H
D.) 2,000Kj
E.) All of the above

Conductivity is the
1.ability of a solute to dissolvein a solven
2. ability of substances to allow electrons to flow
3. ability of particles to disperse evenly into another substance
4.inability of particles to disperse evenly into another substance

The apparatus which cools the gas is called a ______. This changes a gas into a liquid.

Calculate AH for the following reaction.
C2H4(g) + H2(g) → C2H6(g)
(ΔHf° for C2H4(g) = 52.5 kJ/mol; ΔHf° for C2H6(g) = -84.7 kJ/mol)
a. -137.2 kJ
b. -32.2 kJ
c. 32.2 kJ
d. 137.2 kJ

what happens if i give all my points on my next question?

Chemical bonds release energy when they break apart, and take in energy when they form. How does this observation help explain the energy released by burning wood?

1) El CO2 que los astronautas exhalan se extrae de la atmósfera de la nave espacial por reacción con KOH según la reacción: CO2 (g) + 2 KOH (l) → K2CO3 (s) + H2O (l) a) Cúantos gramos de CO2 se pueden extraer con 500 g de KOH ? b) Cuántos gramos de agua se producen? 2) Cuando se hacen reaccionar hidrógeno y nitrógeno se produce amoniaco, un fertilizante benéfico para las plantas. ¿Cuántos moles de hidrógeno se requieren para que reaccionen con 12.75 moles de nitrógeno? La reacción es la siguiente: N2 + 3 H2 → 2NH3 3) El propano (C3H8) es usado como combustible en los hogares, reacciona con el oxigeno para producir dióxido de carbono (CO2) y agua (H2O) mediante la siguiente reacción: C3H8 + 5 O2 → 3 CO2 + 4 H2O a) Si se queman 2 Litros de propano (C3H8) calcula los litros de CO2 que se emiten a la atmósfera.

what are the resulting elements and compounds of a chemical reaction called?

i need the answer in 2 minutes.

What is the formula for tricarbon heptafluoride?
C2F3
CF7
C3F7
C773

help please asap. chem sucks

Two rabbit species, X and Y, live in an Arctic environment that is also populated by wolves. Species x turns white in the winter and
brown in the spring. Species y stays brown all year. The population of species X has slowly been increasing over the population of
species Y. What is most likely causing this population change?

cell are the blank unit of all living organisms​

A prescription is written for 500 mL of a 7% NaCl solution. The technician has a 50% NaCl solution. What volume of
50% NaCl is required for the 7% solution?
mL

80 foot-pounds of work is needed to move the sofa in Tyler's apartment. Which of the following statements is true?