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Atoms
Chemistry
Water
pH and Reactions
Water properties
100
A substance that cannot be broken down into simpler chemical substances.
What is an element?
100
Atoms of the same element that have a different number of neutrons.
What are isotopes?
100
When one or more substances are distributed evenly in another substance.
What is a solution?
100
This measures how acidic or basic a solution is.
What is the pH scale?
100

Ice floats because

solid water (ice) is less dense than liquid water

200

The two subatomic particles of an atom that make up most of the atom's mass

What is a proton and a neutron?

200
The type of bond where atoms SHARE electrons.
What is a covalent bond?
200
Water is a ____________ molecule because it has an unequal distribution of charge.
What is polar?
200
This solution has a pH between 0 and 6.9.
What is an acid?
200

True/False: Because of water's polarity, other substances dissolve more easily in it than any other liquid.

True

300
This is the center of an atom.
What is the nucleus?
300
An atom that has either gained or lost electrons and now has an electrical charge.
What is an ion?
300

The oxygen end of a water molecule has a

slightly negative charge

300
This solution has a pH between 7.1 and 14.
What is a base?
300

This causes water to stick to other polar substances besides other water molecules.

Adhesion

400
These are the two particles that are located within the nucleus.
What are protons and neutrons?
400

From strongest to weakest, what is the strength of the bonds; hydrogen, covalent, ionic

Covalent > Ionic > Hydrogen
400

The hydrogen end of water has a

slightly positive charge

400

The higher the concentration of H+ ions the ..... 

more acidic the solution 

400

In the example using Kool-Aid, these are the solutes and this is the solvent.

What are Kool-Aid packet and sugar (solutes) and water (solvent)?

500
Protons have this charge....and electrons have this charge.
What are positive (protons) and negative (electrons)?
500

Carbon-12, Carbon-13, and Carbon-14 are examples of these.

What are isotopes?

500

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?

What is a hydrogen bond?

500

Basic substances release ______ions  and have a lower number of ____ions

OH-  (hydroxide);  H+ (hydrogen)

500

Why do oil and water not mix together?  explain with polar/nonpolar terms

Polar molecules like polar molecules ( both partially charged). Non-polar like non-polar  (both neutral)