Solvents
When two or more substances that are mixed together, but they are not chemically combined they are called a .............
Mixture
What is the product when a solvents dissolves a solute?
Solution
When you leave an ice cube on the counter, it melts into water. Is this physical or chemical change?
Physical change
You not rust forming on the outside of your car, what type of change occured?
Chemical
Balance this equation: H2+O2= H2O
2 H2O
A mixture that contains small, undissolved particles that do not settle out is called..........
Colloid
If a solution contains too much solvent in relationship to the solute it is considered .........
diluted
You are baking chocolate chip cookies as a chemistry experiment. What are the reactants and what is the product.
Reactants: Ingredients
Product: Cookie
What are the 3 indicators that chemical change took place?
1. color change
2. gas production
3. a new substance forms
C+S8= CS
8C+S8= 8CS
Soda is an example of what type of mixture?
Homogenous
What type of a mixture is chicken noodle soup?
Heterogenous mixture
You are snowboarding and use a "hot hands" to warm your hands.
What type of chemical reaction is taking place AND is energy absorbed or released?
Exothermic and Energy is released
What type of reaction is this?
Decomposition
N2+H2=NH3
N2+3H2= 2NH3
You buy hot chocolate and it too hot to drink immediately, so you let it cool. The chocolate mix settles to the bottom of the cup.This is an example of a .........
Suspension
When a scuba diver is deep underwater, the pressure around their body is very high. At this pressure, extra nitrogen gas dissolves into their blood. If the diver swims to the surface too quickly, the pressure suddenly drops and the dissolved nitrogen forms bubbles in their bloodstream—this dangerous condition is called “the bends.”
Question:
Why does rising to the surface too quickly cause nitrogen bubbles to form in the diver’s blood?
A. The lower pressure near the surface makes the dissolved nitrogen come out of the blood too quickly and form bubbles.
B. The diver’s body heats up at the surface, causing nitrogen to melt.
C. The water at the surface has more oxygen, which pushes nitrogen out of the blood.
D. The diver breathes too fast, filling their body with extra nitrogen.
A. The lower pressure near the surface makes the dissolved nitrogen come out of the blood too quickly and form bubbles.
What type of reaction is this:
2Na+Cl2→2NaCl2
Synthesis
You add salt to ice while making ice cream. You notice the ice feels colder. What type of a reaction is this? WHY?
Endothermic, because it is absorbing energy
FeS2+O2=FeO3+SO4
FeS2+4O2=FeO3+2SO4
Lena is helping her science teacher prepare materials for a lab on gas solubility. She notices that when the cafeteria staff opens a cold can of soda, it fizzes only a little. But when they accidentally leave the soda out on the counter and it warms up, it fizzes a LOT when opened.
If Lena wants the soda to keep the MOST gas dissolved, which combination should she choose?
A: Cold and high pressure
B: Cold and low pressure
C: Warm and high pressure
D: Warm and low pressure
A: Cold and High Pressure
Some hot springs contain dissolved carbon dioxide (CO₂) gas. When the water is heated at the surface, bubbles form and rise.
Question:
Why does heating the water cause CO₂ bubbles to appear?
A. CO₂ reacts with minerals to form bubbles.
B. Higher temperature increases gas solubility, so CO₂ dissolves more.
C. Heating the water increases pressure, trapping more CO₂.
D. Higher temperature decreases gas solubility, so CO₂ comes out of the water.
D. Higher temperature decreases gas solubility, so CO₂ comes out of the water.
What type of reaction is this?
AgNO₃ + NaCl → AgCl(s) + NaNO₃
Replacement
3Fe2O6
How many atoms of iron (Fe) and oxygen (O) are found in the molecule?
6 Fe
18 O
Balance this equation NH3+O2=N2+H2O
2NH3+3O=N2+3H2O