Help me will mark brainliest
Matching: Label each of the following reaction or change as chemical or physical.

Question 13 options:

copper plating a nail

cooking an egg

wood burning

water boiling

making Kool Aid

melting sand to make glass

1.
chemical change

2.
physical change

Question 14 (Mandatory) (2 points)
In an ionic bond, electrons are .

Question 14 options:

gained or lost

given to noble gases

moved to inner shells/orbitals

shared

Question 15 (Mandatory) (2 points)
What happens when an acid is mixed with a base?

Question 15 options:

they will neutralize each other

they will form a gas

they will form a stronger acid

they will form a stronger base

Question 16 (Mandatory) (2 points)
How many valence electrons do most atoms need to have in their outer shell to be most stable?

Question 16 options:

8

1

4

6

Question 17 (Mandatory) (2 points)
Metals tend to electrons and become .

Question 17 options:

lose, cations

lose, anions

gain, cations

gain, anions

Question 18 (Mandatory) (2 points)
What does a chemical change always result in?

Question 18 options:

new reactant

increased activation energy

new substance

precipitate

Question 19 (Mandatory) (2 points)
Question 19 options:
Fill in the blank: What is the correct name for the ionic compound Ca2P5?
Question 20 (Mandatory) (2 points)
Which is NOT evidence of a chemical reaction?

Question 20 options:

precipitate formed

melting

bubbles

color change

Question 21 (Mandatory) (2 points)
What happens in a covalent bond between atoms?

Question 21 options:

the smaller atom’s neutrons repel the electrons

the electrons flow in an electric current away from the bonded pair of atoms

electrons are lost by one atom and gained by the other

each atom shares electrons so that they are both stable

Question 22 (Mandatory) (2 points)
The on the left side of an equation must be balanced with the atoms on the right side of the equation.

Question 22 options:

total number of compounds

total number of molecules

free electrons

total number of atoms

Question 23 (Mandatory) (2 points)
Which of the following equations is balanced?

Question 23 options:

H2 + O2 → H2O + O

4H2 + O2 → H2O + O

2H2 + O2 → 2H2O

H2 + O2 → H2O

Question 24 (Mandatory) (2 points)
What is pH?

Question 24 options:

how basic a solution is

how acidic a solution is

the concentration of hydroxide ions in a solution

the concentration of hydrogen ions in a solution

Question 25 (Mandatory) (2 points)
Choose the equation below that is balanced correctly.

Question 25 options:

S8 + 12 O2 à 8 SO3

2 S8 + 3 O2 à 2 SO3

S8 + 24 O2 à 8 SO3

6 S8 + 8 O2 à 6 SO3