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Brut [27]
3 years ago
9

Match the era on the left with its characteristic on the right.

Chemistry
1 answer:
Troyanec [42]3 years ago
4 0

Answer:

Mesozoic - the era before the current one

Cenozoic - the current era

Paleozoic - when life first flourished

Precambrian - the first era

Explanation:

The Precambrian is the earliest part of Earth's history, the first era. It's named like this because it preceded the Cambrian - the first period of the Phanerozoic eon, which is the current geologic eon. It lasted from the beginning of Earth (about 4.6 billion years ago) to the beginning of the Cambrian Period (about 541 million years ago).

Paleozoic is an era that lasted from about 541 to about 252 million years ago. During this time, life began to flourish.

Mesozoic is an era that lasted from about 252 to 65 million years ago. It's the era that took place before the current one - the Cenozoic.

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6 0
3 years ago
What is the electron configuration for thallium (iii) ion and charge?
svetlana [45]
The electronic configuration of thallium lll ion is 4F^14 5D^10 and it has a charge of +3.
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3 0
3 years ago
At STP, which gas sample has a volume of 11.2 liters?
Natasha2012 [34]

Answer:

0.500 moles of CO2 has a volume of 11.2 L at STP (option B)

Explanation:

Step 1: Data given

Volume of a gas at STP = 11.2 L

STP: Pressure = 1 atm  and temperature = 273 K

Step 2: Calculate volume

p*V= n*R*T

V = (n*R*T)/p

⇒with V = the volume of the gas = TO BE DETERMINED

⇒with n = the number of moles of the gas

⇒with R = the gas constant = 0.08206 L*atm/mol*K

⇒with T = the temperature = 273 K

⇒with p = the pressure of the gas = 1 atm

A ) 0.250 mole of NH3

V = (0.250 * 0.08206 * 273) / 1

V = 5.6 L

B ) 0.500 mole of CO2

V = (0.500 * 0.08206 * 273) / 1

V = 11.2 L

C ) 0.750 mole of NH3

V = (0.750 * 0.08206 * 273) / 1

V = 16.8 L

D) 1.00 mole of CO2

V = (1.00 * 0.08206* 273) / 1

V = 22.4 L

0.500 moles of CO2 has a volume of 11.2 L at STP (option B)

3 0
3 years ago
Is weathering a physical or chemical change, and why?
kumpel [21]
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7 0
3 years ago
The two isotopes of chlorine are 35/17 cl and 37/17cl. which isotope is the most abundant
Natalka [10]

The most abundant is 35/17 Cl

explanation

This is  because Chlorine  35/17 is the one close to the average atomic mass of chlorine which is  35.46 u making it to be the most abundant.

average atomic mass of chlorine is 35.46 + or- 0.02


7 0
3 years ago
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