Chemistry 1
A reaction that feels cold is called what?
An endothermic reaction.
When two or more atoms are joined together chemically they have made a ....(can be the same element)
What is Molecule
Is the water is a saltwater solution the solute or the solvent?
What is solvent?
---------- is known as the universal solvent
What is Water
Water is made of these two elements?
What is hydrogen and oxygen?
What reaction has reactants have more energy than products and they feel hotter?
What is Exothermic?
what chemical reaction do plants do to make food from sunlight?
photosynthesis
A substance formed by chemically combining two or more atoms of different elements is known as
What is Compound
What type of reaction is this:
A + AB ----> AB
a) double replacement
b) decomposition
c) synthesis
Synthesis.
Giving off heat or light is a clue that this type of a change is occuring.
What is a chemical change?
Neon and Argon are examples of
What are Gases
What are the four variables that affect reaction rate?
What is Concentration, Surface Area, Temperature, and Catalysts?
What term refers to anything that occupies space, physical and chemical properties and exists in gas, liquid or solid form
What is Matter
Russian scientist who developed the periodic table
Mendeleev
The elements can be found in the far right group of the periodic table
What are noble gasses?
There are this number of elements on the periodic table of the elements.
What is 118?
What do enzymes do?
Speed a chemical reaction
How does increasing temperature affect the movement of molecules?
What is molecules move faster?
Elements represent unique forms of these little thingies. The building blocks of everything!
What are atoms.
When one chemical changes its state of matter, the change is called
What is Physical Change
The atomic number tells us this.
What is the number of protons?
Type of bonding that forms an electron cloud.
Metallic
Name 4 types of chemical Reactions
Decomposition, synthesis, single replacement, double replacement, combustion
Type of bonding that forms crystal lattice.
Ionic
This is the smallest type of atom.
What is Hydrogen.
What does it mean when we say something is radioactive?
It is unstable...its nucleus is giving off particles or energy
What type of reaction is this?
AB -----> A + B
What is Decomposition?
What is a valence electron?
The number of electrons on the outside of the atom.
What elements are steel made of?
What is C and Fe?
What is the formula for density?
mass/volume
Type of bonding where electrons are shared.
covalent
When a substance gains oxygen, the substance is called:
a) Oxidized, b) magnesiumed, or c) coppered?
What is Oxidized
What type of reaction is this?
CxHy + O2 ----> CO2 + H2O
a) synthesis
b) decomposition
c) combustion
What is combustion?
What is an intermolecular force?
The bonds between atoms.
What are isotopes
Atoms of the same element with different numbers of neutrons
Most of the periodic table is made of what?
metals