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4.) If you change the 2 in front of 2O2 to a 3, what will be the change in the results on the right side of the equation?
A.) There are now 3CO2 molecules
B.) Nothing changes in the equation
C.) There is an extra O2 molecule left over
D.) There are now 3H2O molecules

5.) Which procedure could be used to demonstrate that matter is conversed during a physical change?
A.) Find the mass of a cup of water. Boil the water. Find the mass of the water that remains.
B.)Find the mass of a raw egg. Cook the egg. Find the mass of the cooked egg.
C.) Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
D.) Find the mass of an apple. Cut the apple and remove the core. Find the mass of the remaining apple.

6.) One molecule of bromine (Br2) and two molecules of potassium chloride (KCI) combine in a reaction. How many atoms are in the products?
A.) three
B.) six
C.) four
D.) two

From the equation shown in question 4 , there will be an extra molecule of O2 left over because the number of atoms of each element on the right hand side of the reaction equation must be the same as the number of atoms of the same element on the left hand side of the reaction equation. This is what makes a balanced reaction equation.

The procedure that could be used to demonstrate that matter is conversed during a physical change is to find the mass of a piece of ice, let the ice melt then find the mass of the liquid water.

In the reaction; 2KCl + Br2 ------> 2KBr + Cl2, there are six atoms present in the product according to the balanced reaction equation shown.

Learn more: https://brainly.com/question/9743981

Аноним Аноним · Answer 2 · 2021-11-03T08:09:21+01:00

Answer:

see below

Step-by-step explanation:

1. There is an extra O2 molecule left over.

2. Covalent bonds tend to be less polar than ionic bonds.

3. PH3

4. replacement

5. Potassium is more reactive than hydrogen.

6. Each carbon atom would share one pair of electrons with hydrogen and three pairs with the other carbon atom.

7. H2SO4 + 8HI → H2S + 4I2 + 4H2O

8. 2, 1, 2

9. Nitrogen and oxygen have an electronegativity difference of 0.5, so the bond is polar covalent, with oxygen pulling the electrons toward it.

10. Sodium donates an electron to chlorine.

11. selenium (Se)

12. bond type

13. six

14. K

15.indicator

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