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Chemistry Test#2

QuestionAnswer
Parts of an atom protons, electrons, and neutrons
Takes up mass of an atom. neutrons and protons
electrons take up what in the atom? volume
What does the Atomic # tell you? How many prontons and electrons a atom has
How do you find how many neutrons there are in a atom? Atomic #- atomic mass
Each element has a diffrent what? Protons and atomic number
Atom that have charge are called what? ions
What are positive ions called? Catious
What are negative ions called? anions
Groups on the Periodic Table have what? similar properites
Periods on the Peridic Table have what? range from metals to non-metals
What does a period tell you? # of energy levels
What does a group number tell you? # of valence electrons
What is a stable element? outlet
What are metals that combine with non-metals called? ionic bond
what are nonmetals combined with nonmetals called? covalent bond
What is a reactant? the starting substances in a chemical equation.
What is a product? The ending substances in a chemical equation.
What does the arrow mean in a chemical equation? to "yield"
Chemical reactions are when substances interact chemically, and the bonds between the reactants are broken down and re-arrangred to form a _________________. new substance called products
Chemical reactions ALWAYS obey the law of what? Conservation of Mass
What is the law of Conservation of Mass? Matter is neither created or dystroyed but it is instead re-arranged
The number of valence electrons in an element affects the reactivity of that element. Which element has the fewest electrons listed? A. berllium (Be) B. sodium (Na) C. oxygen (O) D. neon (Ne) sodium
The element Krypton is a gas that shows almost no chemical activity. To find another element with similar properties, what should a student look for on the Periodic Table of the Elements? A. an element in the same group B. an element in the same period an element in the same group
What is an accurate statement in describing the chemical equation shown below? 2H2(g)+O2(g)->2H2O(g)+energy energy is being released
The number of neutrons in an atom is found by....? subtacting the atomic# from the mass#
The diagrams show part of the Periodic Table. The shaded areas repersent a general trend in the number of valence electrons and the darker shading indicates more valence electrons. Which one is it. Geting darker from left to right. -> | | | ||||||||||
Maganese has an atomic# of 25 and an atomic mass of 55 amu. How many ->PARTICLES<- are found in its nucleus? 55
Changing the subscript on an element within a correctly written chemical formula.... changes the formula so that it no longer represents that compound.
When sodium hydroxide reacts with copper nitrate solution, the reaction vessel needs to be kept on ice to slow down the reaction. What best describes the reaction? an exothermic reaction that releases energy
During exercise, muscle cells break down glucose (C6H12O6) to provide energy This chemical reaction is represented by the following chemical equation. C6H12O6 + 6O2 -> 6CO2 +energy (glucose) Oxygen Carbon dioxide Howdoesconservatio The mass on each side of the equation is the same.
2Mg+O2 -> 2MgO In the equation above, what is the coeffcient of the oxygen molecule? 1
What property is the same for every atom of an element? the number of neutrons
An element is identified by: the type of atom
The diffrence between the atomic# of an element and the element's atomic mass is the number of... neutrons
Created by: rhammock15
 

 



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