Matter
I am the same element with the same number of electrons and protons, but a different number of neutrons.
What is an isotope?
The components of a molecule of water.
2 hydrogen atoms and 1 oxygen atom
Capillary action is made possible due to which two properties of water?
cohesion and adhesion
True/False: Water is the only natural substance that can exist in all 3 states of matter at normal temperatures for Earth.
True
Water striders can walk across the surface of calm water. Their feet push the surface of the water down slightly, but they do not break the surface. Why?
A. The insects are light enough so they do not break the hydrogen bonds holding the water molecules together
B The insect’s feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water’s surface.
C. The insects actually use their wings to hover slightly above the water’s surface and they only skim it with their feet.
D. The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next
Answer: A The insects are light enough so they do not break the hydrogen bonds holding the water molecules together
I am the part of the atom that has a negative charge and my mass is 1/1840 of hydrogen
What is an electron?
The hydrogen end of water has a
slight positive charge
True
What property of water describes how plasma (92% water) carries proteins, mineral salts, sugars, hormones, and vitamins?
Universal solvent, polarity (Hydrogen bonding),
Why does ice float?
A. As water freezes, it expands and its density decreases.
B. As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
C. As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
D. As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.
Answer : A. As water freezes, it expands and its density decreases.
In the nucleus of the atom there are protons and ______.
What is neutron?
Which types of compounds dissolve easily in water?
A. Polar and Nonpolar
B. Polar and Ionic
C. Nonpolar and Ionic
D. Covalent and Nonpolar
B. Polar and Ionic
Water is sticking to other water molecules is known as?
Cohesion
The melting point of water is equal to its
freezing point
Water has a high specific heat capacity. This means that it takes a long time to for water to heat up but also a long time to ___ once it's heated.
cool
Positively and negatively charged atoms are known as ____.
What is an ion?
Why are water molecules attracted to each other?
because of polar bonding
What practical applications do isotopes have? (name 2)
What is carbon dating?
What is irradiation in food and cancer cells?
What is radioactive tracing in elements?
Ice floats because
solid water (ice) is less dense than liquid water
Water has a much higher specific heat than most other covalent compounds. What do you predict might happen if water had a low specific heat instead?
A. Flooding would occur and animals would be forced to migrate.
B. Harmful organisms living in water would reproduce at a rapid rate.
C. Organisms that are sensitive to changes in temperature would die.
D. Plants would not have enough water to effectively carry out photosynthesis.
C. Organisms that are sensitive to changes in temperature would die.
This type of bond is a strong bond and occurs when electrons are shared.
What type of bond is formed from the attraction between the positive end of one water molecule and the negative end of another water molecule?
a hydrogen bond
This causes water to stick to other polar substances besides other water molecules.
adhesion
Heat is transferred from the body to water molecules. Because water has a high heat capacity, it requires a lot of heat/energy to evaporate or leave the body in the form of sweat. The transfer of energy allows the body to cool down.
Where will we find that we have warmer winters and cooler summers due to water's high specific heat capacity?
Near the coast