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spin [16.1K]
3 years ago
8

When looking at a chemical reaction, the substance present before the reaction takes place are called the (5) and the substance

produced after the reaction are the (6). We know through the Law of Conservation of (7) that nothing is created or destroyed. This is reflected in a (8) chemical equation, where the atom number of each element on each side of the arrow is (9)-or the same.
Chemistry
1 answer:
faltersainse [42]3 years ago
4 0

Answer:

Explanation:

When looking at a chemical reaction, the substance present before the reaction takes place are called the (5)

REACTANT

and the substance produced after the reaction are the (6).

PRODUCT

know through the Law of Conservation of (7)

MATTER

that nothing is created or destroyed. This is reflected in a (8

BALANCED

chemical equation, where the NUMBER OF  atoms of each element on each side of the arrow is (9)-

equal

or the same.

REMEMBER: WHEN BALANCING EQUATIONS YOU CANNOT CHANGE THE SUBSCRIPTS OF THE COMPOUNDS, YOU CAN ONLY SHOW BY THE COEFFICIENTS HOW MANY MOLECULES YOU HAVE!

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Which ecosystem is the least stable?
Softa [21]

Answer:

tundra bc it has barley any food source and has vary little inhabitants

Explanation:

6 0
3 years ago
What is the net ionic equation for the reaction that occurs when aqueous solutions of koh and zncl2 are mixed?
Mademuasel [1]

Answer:

Net ionic equation:

Zn²⁺(aq)  +   2OH⁻(aq)     →    Zn(OH)₂(s)

Explanation:

Chemical equation:

ZnCl₂ + KOH    →   KCl  + Zn(OH)₂

Balanced chemical equation:

ZnCl₂ + 2KOH    →   2KCl  +Zn(OH)₂

Ionic equation;

Zn²⁺(aq)  + 2Cl⁻(aq)  + 2K⁺(aq)  +  2OH⁻(aq)     →   2K⁺(aq)  + 2Cl⁻(aq)   +Zn(OH)₂(s)

Net ionic equation:

Zn²⁺(aq)  +   2OH⁻(aq)     →    Zn(OH)₂(s)

The K⁺  and Cl⁻  are spectator ions that's why these are not written in net ionic equation. The  Zn(OH)₂ can not be splitted into ions because it is present in solid form.

Spectator ions:

These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.  

5 0
3 years ago
What is the percent by mass of oxygen fe2o3 (formula mass= 160)?
GarryVolchara [31]
30% should be the percentage of oxygen if the total mass of fe2o3 is 160.
5 0
3 years ago
The air in a 2 L balloon at 0.998 atm and 34.0 °C. What will be its pressure if it is brought to a higher altitude where it now
Phantasy [73]

Answer: 0.529 atm

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}

where,

P_1 = initial pressure of gas = 0.998 atm

P_2 = final pressure of gas = ?

V_1 = initial volume of gas = 2 L

V_2 = final volume of gas = 3.5 L

T_1 = initial temperature of gas = 34.0^oC=273+34.0=307.0K

T_2 = final temperature of gas = 12.0^oC=273+12.0=285.0K

Now put all the given values in the above equation, we get:

\frac{0.998\times 2}{307.0K}=\frac{P_2\times 3.5}{285.0K}

P_2=0.529atm

Thus the pressure if it is brought to a higher altitude where it now occupies 3.5 L and is at 12.0 °C is 0.529 atm

4 0
4 years ago
When the metal was placed in the calorimeter, its temperature dropped to the equilibrium temperature. Calculate the change in te
MAVERICK [17]

Answer:

1st one= -79.6

2nd one= -80

3rd one= -81.2

Explanation:

Good luck!

5 0
3 years ago
Read 2 more answers
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