Go With the Flow
This process is when particles move from an area of high concentration to low concentration.
Diffusion
This process is mechanical: air moves in and out of the lungs.
Breathing
This metal burns with a bright white flame when heated in oxygen.
Magnesium
Rutherford discovered that atoms have a small, dense, positively charged ...
Nucleus
A reaction that releases heat is called…
Exothermic
In the diffusion demo, which diffused faster: food colouring in warm water or cold water?
Warm Water
This chemical process happens in cells and releases energy.
Respiration
Sodium reacts with water to produce this
Sodium Hydroxide
Electrons have this electrical charge.
Negative
In an endothermic reaction, the temperature of the surroundings usually does this.
Decrease
Gas exchange happens in these tiny air sacs in the lungs.
Alveoli
Name the muscle that contracts to help you inhale.
Diaphragm
Magnesium reacts with hydrochloric acid to produce hydrogen and this compound.
Magnesium Chloride
The “plum pudding model” described electrons embedded in a sphere of ______ charge
Positive
Combustion of hexane produces these two products.
Carbon dioxide and Water
During gas exchange, which gas diffuses into the blood and which gas diffuses out?
Oxygen into the blood and carbon dioxide out
Where does aerobic respiration take place inside cells?
Mitochondria
Place these metals in order of reactivity (most to least): iron, zinc, magnesium.
Magnesium → Zinc → Iron
This force holds electrons close to the nucleus.
Electrostatic attraction
Some reactions produce multiple products instead of one pure substance. This symbol indicates multiple products in an equation.
The “+” sign
Explain why diffusion is important for respiration in humans.
Oxygen must diffuse into the blood for aerobic respiration, and carbon dioxide must diffuse out as waste?
State the word equation for aerobic respiration.
glucose + oxygen → carbon dioxide + water
Why should only very small pieces of sodium or potassium be used in water demonstrations?
The reaction is extremely vigorous and can be dangerous
What does charging by friction do to an object’s electrons?
It transfers electrons, giving the object a positive or negative charge
Explain why an impure mixture forms when products of a reaction are in the same phase.
The products mix together and cannot be separated by the reaction alone