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3 years ago

5

Pls i need this for finals and fast

1 answer:

topjm [15]3 years ago

8 0

Answer:C

Explanation: Because the oldest fossils are in deeper layers

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Brad is swimming in the ocean on a hot sunny day. He finds the water to be much colder than the sand on the beach, but even thou

Novay_Z [31]

This is due to a physical property called specific heat capacity; the heat capacity of sand is lower than that of water.

The specific heat capacity is known as the amount of energy needed to raise the temperature of 1 g of a substance 1 degree celsius.

Also, the specific heat determines who quickly the temperature of material will raise or fall when it gains or loss heat energy

Furthermore, the specific heat of water is one of the most specific heats of the substances. Therefore, liquid water requires more heat energy to increase its temperature than sand.

So, it is always found that the water is cooler than sand and also water losses its energy slower than sand that the sand be cooler faster than water after sunset.

8 0

4 years ago

A cube of copper metal has a density of 8.96 g/cm3. The cube has a mass of 29.54 g. The atomic radius of a copper atom is 1.28 a

hichkok12 [17]

Answer:

The answer to your question is: 3.745 x 10 ²³ atoms

Explanation:

Data

density = 8.96 g/cm³

mass = 29.54 g

atomic radius = 1.28 A° 1.28 x 10⁻¹⁰ m

Volume of a cube

density = mass / volume

volume = mass / density

volume = 29.54 / 8.96

volume = 3.29 cm³

Volume of a copper atom

volume = (4/3) πr³

volume = (4/3) π (1.28 x 10 ⁻⁸)³

= 8.784 x 10 ⁻²⁴ cm³

Number of atoms = 3.29 cm³ / 8.784 x 10 ⁻²⁴ cm³

= 3.745 x 10 ²³ atoms

8 0

4 years ago

A solution has a pH of 4.20. Using the relationship between pH and pOH, what is the concentration of OH−?

frez [133]

Answer : The concentration of $OH^-$ ion is, $1.58\times 10^{-10}M$

Solution : Given,

pH = 4.20

First we have to calculate the pOH.

As we know that,

$pH+pOH=14$

$pOH=14-pH$

$pOH=14-4.20$

$pOH=9.8$

Now we have to calculate the concentration of $OH^-$ ion.

$pOH=-\log [OH^-]$

$9.8=-\log [OH^-]$

$[OH^-]=1.58\times 10^{-10}M$

Therefore, the concentration of $OH^-$ ion is, $1.58\times 10^{-10}M$

4 0

3 years ago

Read 2 more answers

Convert 15.5m³ to mL

ziro4ka [17]

Answer:

Explanation:

1.55e+7

3 0

1 year ago

If a balloon containing 3000 L of gas at 39°C and 99 kPa rises to an altitude where the pressure is 45.5 kPa and the temperature

ludmilkaskok [199]

$\tt =3000~L\times \dfrac{289}{312}\times \dfrac{99}{45.5}$

<h3>Further explanation</h3>

Given

3000 L of gas at 39°C and 99 kPa to 45.5 kPa and 16°C,

Required

the new volume

Solution

Combined with Boyle's law and Gay Lussac's law

$\tt \dfrac{P_1.V_1}{T_1}=\dfrac{P_2.V_2}{T_2}$

T₁ = 39 + 273 = 312

T₂ = 16 + 273 = 289

Input the value :

V₂ = (P₁V₁.T₂)/(P₂.T₁)

V₂ = (99 x 3000 x 289)/(45.5 x 312)

or we can write it as:

V₂ = 3000 L x (289/312) x (99/45.5)

3 0

3 years ago