10 questions
When logs burn in a fireplace, a chemical reaction is occurring. What is true about this reaction?
[Slide 17]
The reaction is endothermic because it absorbs energy (heat & light) from it surroundings.
The reaction is exothermic because it releases energy (heat & light) into its surroundings.
The reaction involves an ionic compound made up of a metal and nonmetal.
The reaction does not change break apart or change chemical bonds.
Which chemical formula below shows a covalent compound? (Hint: Nonmetal + Nonmetal)
[Slide 9]
MgO
NaCl
HBr
CO2
Which chemical formula below shows an ionic compound? (Hint: Metal + Nonmetal)
[Slide 9]
N2O
NaCl
C6H12O6
CO2
Which type of chemical bond is formed when electrons are shared to help atoms reach octet?
[Slide 11 + 12]
Covalent Bond
Ionic Bond
Only protons are shared in chemical bonds.
Only neutrons are shared in chemical bonds.
Which equation below is balanced to follow the Law of Conservation of Mass?
[Slide 37]
Which of these substances below can be classified as a pure substance?
[Slide 50]
Which substance below would be considered a homogeneous mixture?
[Slide 49 + 50]
Soda
Fruit Salad
Chicken Noodle Soup
Cheeseburger
Which substance below is considered an acidic solution?
[Slide 54]
Vinegar (pH= 2.5)
Bleach (pH = 11)
Water (pH= 7)
Seawater (pH = 8)
How many atoms of oxygen (O) are represented in the chemical formula shown here?
[Slide 27]
2 oxygen atoms
4 oxygen atoms
1 oxygen atom
0 oxygen atoms
A strip of red litmus paper is dipped in an unknown solution. The red paper instantly turns a dark blue color.
What do we know about the solution?
[Slide 56]
The solution is an acid.
The solution is a base.
The solution is neutral.