3 years ago

Why is earth often referd as a blue planet ?

1 answer:

3 0

The earth is often referred as a blue planet because the hydrosphere looks blue and it covers 3/4 of the earths surface. So the answer is D

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When a radioactive atom emits an alpha particle, the original atom's atomic number decreases by four.

solniwko [45]

Ya it is true, alpha particle is actually helium atom with no electrons !
He2+ and it has mass of 4 u ....So that is correct !

5 0

4 years ago

How do i balance C6H12O6+O2 > H2O+CO2

xenn [34]

Answer:

C6H12O6+6O2

Explanation:

c=6

H=12

O=6+2=8

C=1*6=6

H=2*6=12

O=2+1=3-->O=6(2)+6=18

6+?=18

?=12

5 0

3 years ago

The first periodic table of elements was created in 1955. True or false

DaniilM [7]

I believe the answer is false

5 0

3 years ago

A pressure cooker contains 5.68 liters of air at a temperature of 394 K. If the absolute pressure of the air in the pressure coo

Arturiano [62]

Answer:

Explanation:

We shall find out volume of air at NTP or at 273 K and 10⁵ Pa ( 1 atm )

Let it be V₂

$\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}$

$\frac{2\times 10^5\times 5.68}{394} =\frac{10^5\times V_2}{273}$

V₂ = 7.87 litres

22.4 litres of any gas is equivalent to 1 mole

7.87 litres of air will be equivalent to

7.87 / 22.4 moles

= .35 moles .

7 0

3 years ago

Why is water considered a pure substance and not a mixture?

Minchanka [31]

Water is made of only one molecule which can be chemically separated into hydrogen and oxygen. The answer is D.

5 0

3 years ago

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