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3 years ago

Has an asteroid hit Earth in the past

Chemistry

2 answers:

solniwko [45]3 years ago

7 0

—-Yes, I believe so—-

Brrunno [24]3 years ago

6 0

Yes

Explanation:

On 15 February 2013, an asteroid entered Earth's atmosphere over Russia as a fireball and exploded above the city of Chelyabinsk during its passage through the Ural Mountains region.

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What are the chemical properties properties of spray paint?

melisa1 [442]

There is acetone, xylene, and toluene in spray paint

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4 years ago

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Water is made of two [Blank] atoms and one [Blank] atom. (please fill in the blanks)

natima [27]

Two [hydrogen] atoms and one [oxygen] atom

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3 years ago

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PLEASE HELP

sergeinik [125]

Answer : The correct chemical reactions are,

$C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O$

$2CO+O_2\rightarrow 2CO_2$

Explanation :

Law of conservation of matter : It states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.

The balanced chemical reaction always follow that law of conservation of matter.

Balanced chemical reaction : It is defined as the number of atoms of individual elements present on reactant side must be equal to the number of atoms of individual elements present on product side.

(a) The given chemical reaction is,

$CH_4+2O_2\rightarrow CO_2+H_2O$

This reaction is an unbalanced chemical reaction because in this reaction the number of atoms of oxygen and hydrogen are not balanced on both the side. So, it will not obey the law of conservation of matter.

(b) The given chemical reaction is,

$H_2+O_2\rightarrow H_2O$

This reaction is an unbalanced chemical reaction because in this reaction the number of atoms of oxygen are not balanced on both the side. So, it will not obey the law of conservation of matter.

(c) The given chemical reaction is,

$C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O$

This reaction is a balanced chemical reaction because in this reaction number of atoms of individual elements present on reactant side are equal to the number of atoms of individual elements present on product side. So, it obey the law of conservation of matter.

(d) The given chemical reaction is,

$2CO+O_2\rightarrow 2CO_2$

This reaction is a balanced chemical reaction. So, it obey the law of conservation of matter.

(e) The given chemical reaction is,

$4P+O_2\rightarrow P_4O_{10}$

This reaction is an unbalanced chemical reaction because in this reaction the number of atoms of oxygen are not balanced on both the side. So, it will not obey the law of conservation of matter.

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3 years ago

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A solution of saturated pbi2 is found to contain 2.7 ✕ 10−3 m iodide ion. calculate the ksp of pbi2

BigorU [14]

When the compound PbI₂ dissolves, it dissociates as follows;
PbI₂ --> Pb²⁺ + 2I⁻
Molar solubility is the number of moles dissolved in 1 L of solution
A saturated solution is when the maximum amount of solute is dissolved in the solution.
Molar solubility of Iodide when solution is saturated is 2.7 x 10⁻³ mol/L, then solubility of Pb²⁺ is (2.7 x 10⁻³ mol/L) / 2 = 1.35 x 10⁻³ mol/L
ksp is the solubility product constant that can be calculated as follows;
ksp = [Pb²⁺][I⁻]
ksp = (1.35 x 10⁻³ mol/L) x (2.7 x 10⁻³ mol/L)²
= 1.35 x 10⁻³ x 7.29 x 10⁻⁶
= 9.8 x 10⁻⁹

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4 years ago

4. Which change to a DNA molecule would have the least effect on an organism?

Sav [38]

Answer: Change in a single nitrogen base in the DNA sequence will not have any significant effect on the organism.

So A

Explanation:

This is known as point mutation and it does not have any significant change in the protein and it is least harmful type of DNA mutation.

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4 years ago