Chemistry

Acids will turn litmus paper to what color?  
Red

The electrolyte is a solution of water and _________
Sulfuric acid

Which of the following refers to a measure of the quantity of an element or compound?  
Mole

When the charge of an atom becomes unbalanced, the charged atom is called _______   
an ion

Which of the following type of reactions in which bonds within a compound are disrupted by heat or other energy to produce simpler compounds or elements? 
Decomposition or analysis

What do you call the elements in the first two groups in the periodic table?
Light metals

It is the number of protons in the nucleus of an atom
Atomic number

What do you call the electrons in the last orbit or shell of an atom?
External electrons

What is the smallest part of matter?
Particle

Which of the following groups in the periodic table the most strongly electronegative elements?
Group VIA

Adding more solute to an already saturated solution will cause the excess solute to settle to the bottom of the container. What is this process called?
Precipitation

Reactions generally proceed faster at high temperatures because which of the following?
The molecules collide more frequently and the activation energy is less.

Which component of an atom has no electric charge?
Neutron

What is the maximum number of electrons that can be accommodated in the valence shell of an atom?
8

Which of the following refers to the measure of the amount of negative ions in the water?  
Alkalinity

How are metals containing atoms with less than four valence electrons classified?
a conductor

Sublimation is a direct change from
solid to gaseous phase

What term refers to the attraction between like molecules?
Cohesion

Halogens fall under what group in the periodic table?
Group VIIA

What do you call the bonding that occurs in inert gases and other elements with full shells, primarily due to attraction between dipole structures?
Van der Waals

What refers to the negatively charged component of an atom?
Electron

During a complete or partial neutralization of acids, what is the ionic compound formed?
Salt

What type of bond results in form the sharing of electrons by two atoms?  
Covalent bond

Which of the following elements and compounds is unstable in its pure form?
Sodium (Na)

What do you call materials that do not conduct electric current?
Insulator

The opposite of alkali:
Acid

The amount of electricity a battery can produce is controlled by
the strength of the acid

Which one refers to the number of gram-moles of solute per liter of solution?
 Molarity

If an atom contains more than four valence electrons, the material is classified as _______
Insulator

Applying a greater pressure causes pure solvent to leave the solution. What is the name of this process?
Reverse osmosis

What type of bonding occurs in metals when metal atoms lose electrons and he metallic ions are attracted to a “sea” of delocalized electrons?
Metallic bonding

Which of the following elements is NOT radioactive?
Cobalt

Which of the following refers to nucleic acid that stores genetic information?
DNA

During chemical reactions, bonds between atoms are broken and new bonds are usually formed. What do you call the starting substance?
Reactants

What do you call solutions having the same osmotic pressure?
Isotonic solutions

What is the term used to describe hydrocarbons containing single covalent bonds between carbon atoms?
Alkanes

Which of the following will occur if a substance is oxidized?
it loses electrons

Another name for dielectric?
Insulator

Which of the following refers to the change from gaseous to liquid phase?
Condensation

One of the following statements is wrong. Which one?
The mass of an electron is heavier than that of a proton
A deuteron is
a nucleus containing a neutron and a proton

Which one is the positively charged ion?
Cation

What do you call a substance that dissociates in solutions to produce positive and negative ions?
Electrolyte

What refers to the number of gram equivalent weights of solute per liter of solution?  
Normality

Which of the following has the characteristics of both metals and non-metals?
Metalloids

What term is regularly used to refer to a negatively charged ion?  
Anion

What type of reaction has two compounds as reactants and two compounds as products?
Double displacement

How much is the pH content of a base
Between 7 and 14

During chemical reactions, bonds between atoms are broken and new bonds are usually formed. The ending substance is called ________
Products

What type of reaction has one element and one compound as reactants?
Single displacement

Which is not a state of matter?
Dew

Diamond is
a pure carbon

When different phases (solid, liquid or solid and gas) are present in a heterogeneous mixture, the method of separation used is ________
Filtration

What is the conversion of liquid into gaseous state?  
Evaporation

What refers to the property of the substance which changes when the amount of the substance changes?
Extensive property

If a property of a substance does not change when the amount of the substance changes, it is a/an __________ property.  
Intensive

Mixtures can be classified as:
heterogeneous and homogeneous

The properties of solids depend on both:
their chemical composition and their structure

All gaseous mixtures are
homogeneous

Elements are composed of how many types of atoms?
4

The mass of proton is approximately how many atomic mass unit (amu)?
1

What is the neutral atom?  
an atom with electrons the same number as protons

What type of bonding in which electrostatic attraction is predominant?
ionic bonding

What term refers to the passage of an electric current through an electrolyte caused by an external voltage source?
Electrolysis

When all of the atoms of a molecule are the same, the substance is called
a compound

What is formed when acids will react with active metals?
Hydrogen

How much is the pH content of an acid?
Between 0 and 7

What is a substance that speeds up a chemical reaction without itself undergoing a chemical change?
Catalyst

The condition of a liquid electrolyte is measured in terms of its
Specific gravity

Which is NOT a part of an atom?  
Ion

How does all B families and group VIII in the periodic table named?
Transition metals

The device which measures the acid content of the cell is called ________
Hydrometer

The vertical columns in the periodic table are called
Groups

An atom that loses some of its electron or accepts extra electrons from another is called
Ion

In a copper atom, the valence ring contains:
One electron

In which of the following is energy removal being applied?
Changing water to ice

Which of the following is added to the drinking water distributions system for disinfection?
Chlorine

What do you call a substance that cannot be decomposed any further by a chemical reaction?
Element

Which of the following is the strongest type of bonds?
Covalent

What do you call hydrocarbons containing carbon to carbon double bonds?
Alkenes

The air we breathe is an example of
a mixture

What is the atomic number of helium?
2

Element with the least atomic number is
Hydrogen

What is the symbol of silver?
Ag

“P” is the symbol of what element?
Phosphorous

The atomic number of Germanium is  
32

An idea put forth for testing is called
hypothesis

How many elements are there all in all?
 112

Which of the following are found in the nucleus of an atom?  
Protons and neutrons

What element is known as the lightest metal?
Lithium

Bases will turn litmus paper to what color?
Blue

Which of the following is the atomic number of silicon?
14

“At the same pressure and temperature, equal volumes of all gases contain equal number of molecules”. This is known as
Avogadro’s Law

Which of the following refers to the number of protons and neutrons in the nucleus of an atom?
Atomic weight

What is the smallest subdivision of an element or compound that can exist in a neutral state?
Molecule

The formula for Dinitrogen Pentoxide is
N2O5

The elements if Group 0 in the periodic table are called _________
Noble gases

The smallest whole unit of an element?
Atom

Which of the following groups in the periodic table the most weakly electronegative elements?
Group IA

miscellaneous Questions (C14 Past board: Excel)

ECE Board Exam April 2001
Refers to one of the commonly used search engine in the enternet service.
Excite

ECE Board Exam November 1999
Refers to a major advantage in the selection of a guided tube.
High power

ECE Board Exam April 1999
Where does the headquarters of the Asia Pacific Telecommunity (APT) based?
Bangkok

ECE Board Exam NOvember 1998
One of the commonly used domain in the internet service.
.com

ECE Board Exam April 1998
What is the equivalent of decimal 51 in binary?
110011

ECE Board Exam April 1997
What is the impedance in ohms of a transformer marked for 25V, 4W, when the secondary is correctly loaded?


ECE Board Exam November 1997
Thesmaller the f rating, the _______ light that lens can take in.
more

ECE Board Exam November 1997
An area in the memory used to temporary storage of information, on "Last in First out" basis.
Stack

ECE Board Exam November 1999
Resonant frequency of a class-C amplifier in a communication circuit is dependent on
L and C tank circuit

ECE Board Exam April 1999
Who is the main chairman of the Presidential Communication on Y2K compliance in the country?
Amable Aguiluz

ECE Board Exam November 1998
What is the typical number of bits in a static memory location?
8

ECE Board Exam November 1997
Halo is also called
flare

ECE Board Exam April 2001
What electronic instrument or device can show both the fundamental and harmonics frequencies of a receiver carrier?
spectrum analyzer

ECE Board Exam November 1999
Find the sum of the following binary number 11 and 111 in decimal.
10

ECE Board Exam April 1999
One of the common search engine used in internet services.
Lycoos

ECE Board Exam April 1998
This refers to an area in the memory used for temporary storage of information on the basis of "Last in First out"
Stack

ECE Board Exam November 1999
When one Boolean operation has a result which is negative of another, the two operation are said to be ________
inverse

ECE Board Exam April 1998
Find the products of the following binary number 100 and 101
10100