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Varvara68 [4.7K]

3 years ago

7

1. Draw a wave with a longer wavelength and the same amplitude as the wave shown. Then draw a second wave with a larger amplitud

e and the same wavelength as the wave shown.

2 answers:

velikii [3]3 years ago

7 0

Answer:

Sound traveling

Explanation:

fgiga [73]3 years ago

7 0

Sound traveling is because it’s a longer wavelength

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Make the conversion indicated ineach of the following:

Citrus2011 [14]

Explanation:

(a) The length of a soccer field, 120 m (three significant figures), to feet.

1 m = 3.28084 feet

$120 m=120\times 3.3 feet=396 feet$

(b) The height of Mt. Kilimanjaro, at 19,565 ft the highest mountain in Africa, to kilometers

1 feet = 0.0003048 km

$19,565 feet=19,565\times 0.0003048 km=5.963412 km$

(c) The area of an 8.5 ×11-inche sheet of paper in $cm^2$ .

Area of the sheet = 8.5 inches × 11 inches = 93.5 $inches^2$

$1 inch = 2.54 cm$

$93.5 inches^{2}=93.5\times (2.54)^2 cm^2=603.2246 cm^2$

(d) The displacement volume of an automobile engine, 161 $inch^3$ , to liters.

$1 inch^3 = 0.0163871 L$

$161 inch^3=161\times 0.0163871 L=2.63832 L$

(e) The estimated mass of the atmosphere, $5.6\times 10^{15} tons$ , to kilograms.

1 ton = 907.185 kg

$5.6\times 10^{15} tons=5.6\times 10^{15}\times 907.185 kg$

$=5.08023\times 10^{18} kg$

(f) The mass of a bushel of rye,32.0 Ib, to kilograms

1 lb = 0.453592 kg

$32.0 lb =32.0\times 0.453592 kg=14.515 kg$

(g) The mass of a 5.00-grain aspirin tablet to milligrams.

(1 grain = 0.00229 oz)

Mass of 5 grains = 5 × 0.00229 oz = 0.01145 oz

1 oz = 28349.5 mg

$0.01145 oz=0.01145\times 28349.5 mg=324.601775 mg$

4 0

3 years ago

What is the temperature if 2L of 3moles HCl react with 2atm?

swat32

Answer:

$T=16K=-256.8\°C$

Explanation:

Hello!

In this case, according to the gas laws, we would be able to assume HCl can be modeled as an ideal gas for this calculation purpose; in such a way, we use the following equation to compute the temperature:

$PV=nRT\\\\T=\frac{PV}{nR}$

In such a way, we plug in moles, volume and pressure to obtain:

$T=\frac{2atm*2L}{3mol*0.08206\frac{atm*L}{mol*K}}\\\\T=16K=-256.8\°C$

Best regards!

8 0

3 years ago

Using table 9.4, calculate an approximate enthalpy (in kj) for the reaction of 1.02 g gaseous methanol (ch3oh) in excess molecul

Tanya [424]

<u>Given:</u>

Mass of methanol = 1.02 g

<u>To determine:</u>

Enthalpy for the reaction of 1.02 g of methanol with excess O2

<u>Explanation:</u>

Balanced equation-

2CH3OH(g) + 3O2(g) → 2CO2(g) + 4H2O(g)

The reaction enthalpy is given as:

ΔHrxn = ∑nH°f(products) - ∑nH°f(reactants)

where n = number of moles

H°f = standard enthalpy of formation.

ΔHrxn = [2H°f(CO2(g)) + 4H°f(H2O(g))] - [2H°f(CH3OH(g)) + 3H°f(O2(g))]

= [2(-393.5) + 4(-241.8)]-[2(-201.5) + 3(0)] = -1351.2 kJ

Now, 1 mole of CH3OH = 32 g

The calculated ΔHrxn corresponds to 2 moles of CH3OH. i.e.

The enthalpy change for 64 g of Ch3OH = -1351.2 kJ

Therefore, for 1.02g gaseous methanol we have:

ΔH = 1.02 * -1351.2/64 = -21.5 kJ

Ans: The enthalpy for the given reaction is -21.5 kJ

6 0

3 years ago

2) Will all atoms behave exactly the same when the temperature is changed?

Butoxors [25]

no...the atoms will not behave the same

as when temperature is increased, the atoms vibration and kinetic energy will also be increased....they come in excited state...

where as when temperature is reduced ,atoms kinetic energy slows down....

7 0

3 years ago

In order to change a solid to a liquid or a liquid to a gas, what is needed?

AfilCa [17]

Latent heat, also called the heat of vaporization, is the amount of energy necessary to change a liquid to a vapour at constant temperature and pressure. The energy required to melt a solid to a liquid is called the heat of fusion

6 0

3 years ago