Question

I2 + Na2S2O3 → NaI + Na2S4O6

Balance the equation, if necessary.
A) balanced
B) I2 + Na2S2O3 → 2NaI + Na2S4O6
C) I2 + 2Na2S2O3 → 2NaI + Na2S4O6
D) 2I2 + 2Na2S2O3 → 2NaI + Na2S4O6
8)
Once out in space, the space shuttle needs to ________________ to keep going in the same direction at the same speed.
A) turn off its engines
B) continue to fire its engines
C) fire its engines intermittently
D) gradually slow the engines down
9)
Substance Number of Calories of Heat
1 0
2 100

The substances in the table are combined, and Substance 2 loses 50 calories of heat. How many calories of heat will Substance 1 eventually gain?
A) 10
B) 25
C) 50
D) 100
10)
What would be the result of an alpha particle coming into a magnetic field?
A) The alpha particle will stop moving.
B) The alpha particle will reverse its direction.
C) The alpha particle will be deflected in a curve path.
D) The alpha particle will continue to travel in a straight line.
11)
According to the law of conservation of energy,
A) an object loses most of its energy as friction.
B) the total amount of energy for a system stays the same.
C) the potential energy of an object is always greater than its kinetic energy.
D) the kinetic energy of an object is always greater than its potential energy.
12)
Which of these is true for a fission reaction?
A) It is an endothermic reaction.
B) A heavy nucleus splits into two smaller nuclei.
C) Two light nuclei combine to form a single heavier nucleus.
D) It is an interaction between valence electrons of an atom.
13)
Which would be best categorized as heat transfer by convection?
A) Wearing a white shirt to stay cool on a summer day.
B) Noodles rising and falling in a pot of boiling water
C) Touching a metal spoon that is sitting in a pot of boiling water
D) Using a heating blanket to get warm
14)



If there are 50 grams of U-238 on day zero of radioactive decay, how much will there be after 4.5 billion years?
A) 0.0 grams
B) 10 grams
C) 25 grams
D) 50 grams
15)



Refraction or the bending of waves takes place when a light wave changes
A) color.
B) frequency.
C) intensity.
D) speed.
16)
Br-79
Br-81
_______ are different forms of a single element.
A) Atoms
B) Elements
C) Ions
D) Isotopes
17)
A satellite orbiting above the earth needs no power source to keep orbiting the earth. The best explanation for this involves the law of inertia. Simply put the law of inertia states
A) for every force on an object that object exerts an equal and opposite force back.
B) a body in motion will continue in motion unless acted upon by an outside force.
C) the net force equals the mass times the acceleration of and object.
D) energy cannot be created or destroyed on changed forms.
18)



Which phrase can accurately be placed in the middle, within both circles?
A) has a pH of 7
B) dissolves metals
C) ionizes in water
D) turns red litmus paper blue
19)
Lakes and ponds which have limestone or calcium carbonate are affected less by acid rain than those which have granite. This is because
A) granite solutions are basic and neutralize the acid rain.
B) granite solutions are neutral and are not affected by acid rain.
C) calcium carbonate solutions are basic and neutralize the acid rain.
D) calcium carbonate solutions are neutral and are not affected by acid rain.

Answer 1

The balanced chemical reaction will be,

i2 + 2 Na2S2O3 = 2 NaI + Na2S4O6

Step-by-step explanation:

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

1/34/24/2/34/34//56/mn4n4

The given unbalanced chemical reaction is,

43ju89349t47235./4/5

This chemical reaction is an unbalanced reaction because in this reaction, the number of atoms of iodine, sulfur and oxygen are not balanced.

454325.43,532.4,523

In order to balanced the chemical reaction, the coefficient 2 is put before the and .

24.534.5,345.35,32

Thus, the balanced chemical reaction will be,

i2 + 2 Na2S2O3 = 2 NaI + Na2S4O6