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nikdorinn [45]
3 years ago
15

Hydrogen and oxygen react to form water. At an atomic level, how do we know that a chemical reaction has occurred

Chemistry
1 answer:
makkiz [27]3 years ago
3 0

Answer:  Bubbles are evidence that a chemical reaction took place because cause formation of a precipitate. Bubbles are evidence that a chemical reaction took place because they indicate the formation of gas as a new product.

Explanation:

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Can someone help me with number 4? Please and thank you
kipiarov [429]

Answer:

1st Blank: <em>1 Co</em>

2nd Blank:<em> 2 Na2S</em>

3rd Blank:<em> 4 Na</em>

4th Blank:<em> 1 CoS2</em>

Explanation:

<em>Trust me</em>

6 0
3 years ago
Find mass of 3 moles of water​
EleoNora [17]

Answer:

54 g

Explanation:

1 mole of water = H2O

mass of 1 mole of H2O= mass of h2 + mass of o

= 2× mass of h +mass of o

= 2×1+16 =18 g

1 mole of water = 18g

3moles of water = 18×3g= 54g

6 0
3 years ago
Magnesium is a metal with two elections in its outermost energy level. When it becomes an ion, what happens to its valence elect
Law Incorporation [45]

Answer:

The answer to your question is Mg loses its valence electrons and acquire a positive charge (Mg⁺²).

Explanation:

Valence electrons are important for an element to attach to another one, metals lose these electrons while nonmetals gain electrons to complete the octet rule.

Magnesium is a metal that loses these electrons so when it becomes an ion Magnesium will have a positive charge  Mg⁺².

3 0
3 years ago
The gas phase reaction, A2 + B2 ----&gt;2AB, proceeds by bimolecular collisions between A2 and B2 c,o(\'e'9 molecules. The rate
Varvara68 [4.7K]

Answer:

The reaction rate becomes quadruple.

Explanation:

According to the law of mass action:-

The rate of the reaction is directly proportional to the active concentration of the reactant which each are raised to the experimentally determined coefficients which are known as orders. The rate is determined by the slowest step in the reaction mechanics.

Order of in the mass action law is the coefficient which is raised to the active concentration of the reactants. It is experimentally determined and can be zero, positive negative or fractional.

The order of the whole reaction is the sum of the order of each reactant which is raised to its power in the rate law.  

Thus,  

Given that:- The rate law is:-

r=k[A_2][B_2]

Now, [A'_2]=2[A_2] and [B'_2]=2[B_2]

So, r'=k[A'_2][B'_2]=k\times 2[A_2]\times 2[B_2]=4\times k[A_2][B_2]=4r

<u>The reaction rate becomes quadruple.</u>

5 0
3 years ago
The mass number of an atom is the number of
sergeinik [125]

Answer:

protons plus neutrons

Explanation:

jsut the definition

6 0
2 years ago
Read 2 more answers
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