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ollegr [7]
3 years ago
11

Which element is this.Its shiny,Is solid at room temperature, has atoms with two valence electrons?A:Lithium B:Strontium C:Alumi

nium D:Silicon
Chemistry
1 answer:
tatyana61 [14]3 years ago
4 0

Answer:

Stronium

Explanation:

It is a metal (and shows classic physical proerties). It also belongs to the second family, meaning it has two valence electrons.

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What evidence supports the law of conservation of energy?
Travka [436]

Answer:

light energy is converted to chemical energy during photosynthesis.

Explanation:

Law of conservation of energy says: Energy can neither be created nor destroyed-only converted from one form of energy to another.

3 0
3 years ago
While both comets and asteroids are found to orbit the sun in our solar system which system which choice correctly explain how t
Alika [10]

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Comets are made of ice, dust, and rocky material. Asteroids are made of rock and metal material.

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thats how they are different from each other

6 0
3 years ago
Calculate the molecules in 9.78 moles of oxygen gas
Hoochie [10]

Answer:

i am quite unsure what you want me to answer but if you explain it to me w ould live to help

Explanation:

7 0
3 years ago
If 0.250 mol of hydrogen gas occupies 0.333L at 20.0c what is the pressure in atmospheres?
maria [59]

Answer: The pressure will be 18.05 atm.

Explanation: Expression for ideal gas equation is :

PV=nRT

where,

P = Pressure of the gas = ? atm

V = Volume of the gas = 0.333L

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R = Universal gas constant = 0.082057\text{ L atm }mol^{-1}K^{-1}

T = temperature of the gas = 20°C = (273 + 20)K = 293K

Putting values in above equation, we get:

P\times 0.333L=0.250mol\times 0.082057\text{ L atm }mol^{-1}K^{-1}\times 293K

P = 18.05 atm

8 0
4 years ago
29. The chemical equation H2 + O2 + H2O represents what type of equation?
slavikrds [6]

Answer:

The chemical equation H2 + O2 + H2O represents what type of equation?

A. A balanced equation

xXxAnimexXX

4 0
2 years ago
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