3 years ago

Moseley's changes to the periodic table were based mainly on what part of the scientific process

Chemistry

1 answer:

ale4655 [162]3 years ago

6 0

I believe the answer is observation of the elements

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It has been proven that North America is moving west about 2 cm per year. How many kilometers wouldn’t move in 5000 years

Viefleur [7K]

0.1 km

2cm/year * 5000 yrs = 10000 cm

1cm= .01 m

1km = 1000 m

so the answer is 0.1 km

7 0

3 years ago

What is the mass of bromine gas if it has a pressure of 720 mmHg, volume of 25mL and a temperature of 18.3 degrees Celsius

Annette [7]

Answer:

Mass = 0.158 g

Explanation:

Formula used,

P V = n R T

Or,

n = P V / R T

Putting values,

n = 0.948 atm . 0.025 L / 0.0821 L.atm.K⁻¹.mol⁻¹ . 291.45

n = 0.00099 mol

Note: we have changed pressure from mmHg to atm, volume from mL to L and temperature from C to K)

Also,

Mass = n . Molecular Mass

Mass = 0.00099 mol × 159.808 g/mol

Mass = 0.158 g

7 0

2 years ago

Which explains why carbon is a component of so many elements?

murzikaleks [220]

Carbon is a component of so many elements because <span>It can form stable compounds with other elements and also bond with them.</span>

5 0

3 years ago

WILL OFFER BRAINLIEST IF YOU CAN ANSWER THIS

AleksAgata [21]

Answer:

Explanation:

Thats the correct anwers

5 0

3 years ago

Dinitrogen pentoxide is used in the preparation of explosives. If 7.93 mol of

Tpy6a [65]

The volume of O₂ produced: 84.6 L

<h3>Further explanation</h3>

Given

7.93 mol of dinitrogen pentoxide

T = 48 + 273 = 321 K

P = 125 kPa = 1,23365 atm

Required

Volume of O₂

Solution

Decomposition reaction of dinitrogen pentoxide

2N₂O₅(g)→4NO₂(g)+O₂ (g)

From the equation, mol ratio N₂O₅ : O₂ = 2 : 1, so mol O₂ :

= 0.5 x mol N₂O₅

= 0.5 x 7.93

= 3.965 moles

The volume of O₂ :

$\tt V=\dfrac{nRT}{P}\\\\V=\dfrac{3.965\times 0.082\times 321}{1.23365}\\\\V=84.6~L$

5 0

3 years ago