2018-02-26 05:27
In studying the laws of gases there are different variables that we need to consider. These are the volume, pressure, temperature, and the number of moles. Volume is the amount o… Read More
Blog Directory > Education Blogs > Science Concepts and Questions (K to 12) education Blog >
2018-02-06 15:01
Pressure is defined as force that is applied in a given area, P = F/A. Gases exert pressure on the surface in which they are in contact because the molecules of gases are always… Read More
2018-02-03 14:53
We learned from elementary the three phases of matter, the solid, liquid and gas. We also learned the different simple properties of solid, liquid and gas. We knew that solid has… Read More
2018-01-08 14:17
Molar mass is the mass in grams of 1 mole of a substance . It can be calculated by summing all the masses of all the atoms present in a compound. For an element, the molar mass i… Read More
2017-12-16 14:33
Mole, which is symbolized n, and has a unit mol is the counting unit for number of atoms, ions or molecules. One mole is the amount of substance (either in atoms, ions or molecules) as… Read More
2017-12-03 09:24
Intermolecular forces are attractive forces between molecules. This forces are responsible for the non-ideal behavior of gases at high pressures and low temperatures. This… Read More
2017-11-25 09:59
Molecular geometry is the three-dimensional arrangement of atoms in a molecule. This is also called molecular shape. To determine the molecular geometry of molecule you have to k… Read More
2017-09-05 16:34
Bond Polarity is used to describe the sharing of electrons between atoms in covalent bonding. A polar covalent bond is a bond in which there is unequal sharing of electrons between ato… Read More
2017-08-19 15:43
Covalent bond is another type of bond that involves the sharing of valence electrons between nonmetal atoms forming a molecule. Covalent compounds are the compounds that contains only… Read More
2017-07-26 14:34
Ionic bond is a type of chemical bond that exist between metal and nonmetal forming an ionic compound which involves transfer of electrons. Metals having low in ionization energy… Read More
2017-07-24 13:53
Chemical bond is an attraction that hold atoms together forming molecule and formula unit. There are three general types of bonds: the ionic, covalent and metallic. Ionic bond refers t… Read More
2017-07-24 04:25
To know more about the different elements in the periodic table, you need to know the different properties of the elements and their trends. We need to recall that Periodic Table of E… Read More
2017-07-19 03:02
What is valence electrons?Valence means last, therefore valence electrons are the electrons located at the highest energy level. Valence electrons are the one responsible for chemical… Read More
2017-07-02 15:29
Electron configuration is the arrangement of electrons in successive sublevels and orbitals. To determine the electron configuration of the elements electron distribution mnemonics is… Read More
2017-06-24 10:54
Based from the flame test, Neils Bohr compared the model of an atom with that of the solar system. The nucleus of an atom is comparable to the sun the center of the atom and the energy level… Read More
2017-06-17 15:26
We know that atom is composed of three fundamental particles, the proton, electron and neutron. And that the protons and neutrons are located inside the nucleus and electrons are found… Read More
2017-06-12 14:44
Chemical formula shows the kind and number of atoms present in molecules or ionic compounds. Knowing the formula of a compound, you can determine the number of atoms and kinds of atoms prese… Read More
2017-06-04 14:58
Circulatory system is the life support structure that delivers oxygen and nutrients to the cells of the different parts of the body and also transport waste away from the body. It is c… Read More
2017-05-31 16:21
Respiratory system is composed of different organs in our body that are responsible for breathing. Breathing is a process of taking in oxygen and expelling carbon dioxide from our body. &nbs&hell…Read More
2017-05-29 16:12
Colligative properties of solution are properties of solution that depend on the amount of solute present in the solution and not on the nature of solute particles. These are the vapor… Read More
2017-05-22 15:42
Concentration is defined as the amount of solute present in a given amount of solvent. It can be expressed qualitatively and quantitatively. The qualitative way of expressing the… Read More
2017-05-16 15:43
Dissolution is a process whereby solute is attracted to the solvent forming a solution. Dissolution can either proceed faster or slower depending on the different situations. &nb&hell…Read More
2017-05-16 14:51
Solubility is defined as the maximum amount of solute that will dissolve in a given amount of solvent at a specific temperature. A solution which contains the maximum amount of solute… Read More
2017-05-14 05:06
Mixtures are around us. We encountered them everyday. Mixtures are either homogeneous and heterogeneous. The homogeneous mixture is what we called solution. Some exam… Read More
2017-05-02 15:45
Between the period of 1800 and 1900, there were more than half of the elements known today were already discovered. And there were elements that are found to have similar physical and… Read More
2017-05-01 15:57
All atoms contain the three fundamental particles of matter, the proton, electron, and neutron. But how do the atoms differ from one another? Each element has its unique number o… Read More
2017-04-29 16:12
Atom is considered the smallest particles of matter, according to Dalton's Atomic Theory, but it was found by some scientists that atom has still subatomic particles called the electro… Read More
2017-04-27 15:48
As you learned from my previous post that matter is anything that occupies space and has mass. It means what we can see around us are matter. It can be living matter or nonliving… Read More
2017-04-27 13:13
Matter is anything that occupies space and has mass. We have different kinds of matter. We can distinguish one from the other through their physical and chemical properties. Phys… Read More
2017-04-24 16:07
Before studying further some topics in chemistry it is very important to know the basic concepts in chemistry, the classification of matter. Matter is classified according to physical… Read More
2017-04-21 17:18
You learned from my previous post that processes can be spontaneous and non-spontaneous. Spontaneous processes can be endothermic and exothermic. Usually, an spontaneous endothermic pr… Read More
2017-04-18 08:37
There is no easy method of measuring ∆S for a reaction, but we can use experimental measurements of variation of heat capacity for many substances at any temperature. Absolute e… Read More
2017-04-17 16:15
We learned that entropy is a measure of randomness and disorder of a system. In this topic entropy will be discussed based on how the structure and behavior of molecules affect the entropy o… Read More
2017-04-13 22:31
We learned from my previous post that energy is conserved during the process, and this is called the first law of thermodynamics. Energy is just transformed from one form to another fo… Read More
2017-04-04 17:01
Hess Law is another way of manipulating the enthalpy change of the reaction. It states that if a reaction is carried out in a series of steps, ∆H for the reaction will equal the… Read More
2017-04-04 15:57
Elements combine to form compounds, compounds on the other hand also combine with another compound to form a different compounds, these are just some of the reactions that occur in our envir… Read More
2017-03-27 16:26
Heat flow in a particular chemical reaction can be determined experimentally by measuring the temperature change it produces. Calorimetry is the measurement of heat flow. The apparatus… Read More
2017-03-26 15:22
Chemical reactions can either absorb or release heat to the surroundings. Enthalpy is a thermodynamics quantity that is account for the heat flow in chemical changes occurring at a con… Read More
2017-03-13 15:30
From the previous post we learned that energy can be transferred back and forth between the system and the surroundings in both open system and closed system in the forms of work and heat.&n&hell…Read More
2017-03-12 15:32
Energy is defined as the capacity to do work. All forms of energy are capable of doing work but not all are relevant to chemistry. Kinetic energy, potential energy, radiant energ… Read More
2017-03-08 16:51
A catalyst is a substance that increases the rate of chemical reaction by providing an alternate reaction pathway with lower activation energy without undergoing any change in itself. … Read More
2017-03-01 07:55
Do you know how reaction occurs? Can a balanced chemical equation tells us how the reaction occurs? The answer is no. Reaction mechanism is a process by which a reaction occurs… Read More
2017-02-18 22:57
Rate law is an equation that relates the reaction rate to the concentration of the reactants. Meaning it is dependent on the concentration of the reactants not the coefficient in the b… Read More
2017-02-13 01:42
In my previous post I posted the factors affecting reaction rates, it means you know already how to increase or decrease the rate of chemical reaction if in case you are the one manipulating… Read More
2017-02-04 22:49
Reactions come everywhere in our environment, some reactions occurs very slow and some occurs very fast. The area of chemistry that deals with the speed, or rate at which chemical reac… Read More
2017-02-03 02:58
In science we encounter problem solving where conversion of units are needed. In conversion of units the easiest way is to use dimensional analysis or factor label method, a method of… Read More
2017-01-28 14:41
Science is meaningless without mathematics. We do calculations in science especially in chemistry and physics. Calculations is also meaningless without units attached on it or nu… Read More
2017-01-07 16:16
Very large and small numbers are difficult to deal with in calculation. Let say for example you want to multiply a small number like 0.000 000 000 000 000 233 with a large number like… Read More
2017-01-04 16:33
In science, we measure, calculate, round off numbers, We encounter very small and large numbers which need to be calculated. You will encounter problems if you do not know what i… Read More
2016-12-29 16:30
I observed in my classes that my students are always asking if how many decimal places are they going to round off the result of their calculations. As a student they must know how to… Read More
2016-12-26 16:15
In calculating problems related to science or when measuring something, it is important that everyone knows significant figures. Significant figure is a number that contains certain di… Read More
2016-12-21 23:01
Chemical equilibrium means that there is a balance between the rate of forward and backward reaction. But this condition is so sensitive that whatever changes in some factors or variab… Read More
2016-11-28 16:48
In my previous post, I posted how to express the Equilibrium Constant Expressions for a given reaction, the standard format using molarity as unit for the concentration of reactants and prod… Read More
2016-10-21 16:08
I discussed in my previous post about chemical equilibrium, in which it is considered a dynamic process, wherein the two processes involved do not stop, they occur at equal rate. Two c… Read More
2016-10-17 15:45
Chemical reactions are everywhere. Some go in one direction only, the forward reaction and some go in two directions, the forward and backward reaction. The latter is called reve… Read More
2016-10-04 13:47
In my previous post you learned how to calculate the pH and the [H+] of solution even without the calculator using the formulaBut what about if the given hydrogen ion concentration is not ba… Read More
2016-10-01 13:00
In my previous post, I posted the definition of acids and bases and the properties of acids and bases. We learned that acids donates H+ ions in solution while bases donates OH- ions in solut… Read More
2016-09-29 14:11
We learned in my previous post the different weak electrolytes and strong electrolytes. Strong electrolytes are 100% dissociated or ionized in water while weak electrolytes only few %… Read More
2016-09-21 14:39
There are ways in which we can balance chemical equation, simple equations can be balanced using inspection method . Simple oxidation-reduction reaction can also be balanced by i… Read More
2016-09-19 13:24
Oxidation number is also called as oxidation states, it refers to the electrons lost or gain during chemical reaction. To determine whether an atom undergoes oxidation or reduction in… Read More
2016-09-13 15:25
Oxidation-Reduction reaction is also called redox reaction, which involves transfer of electrons between two species. The oxidation number of atoms or ions change by either gainin… Read More
2016-09-10 13:28
In my previous post, I discussed the different types of chemical reactions, the combination reaction, decomposition, single replacement and double replacement reaction. Acids and bases under… Read More
2016-08-29 15:48
How do you identify an acid and a base? You may say that acid has sour taste. Yes your are right! There are several examples of acids that you are familiar, like for example asco… Read More
2016-08-26 13:40
In my previous post we learn about chemical equation and the types of chemical reactions. All cited equations are example of molecular equation. Molecular equations show the reac… Read More
2016-08-24 13:40
Solution is a homogeneous mixture of solute and solvent. Solute is a substance or component present in smaller quantity or proportion, while solvent is a substance or component present… Read More
2016-08-01 15:02
Reaction is not always 100 % complete, there are several factors that the actual yield is not equal with theoretical yield. Theoretical yield is the expected amount of product/s if all… Read More
2016-07-31 15:09
In every reaction, reactants are not always present in exact stoichiometric amounts. There is always reactant that exceeds the required amount and is called excess reagent and th… Read More
2016-07-28 15:19
Stoichiometry is a quantitative study of reactants and products in chemical reaction. Stoichiometry calculation of chemical reaction enables us to predict the amount of products that c… Read More
2016-07-24 07:10
Chemical formula is a shorthand way of writing chemical compounds. Instead of writing the full name of a compound chemical formula is written. Instead of saying water, carbon dio… Read More
2016-07-23 14:55
Double Replacement Reaction is a type of chemical reaction where two ionic compounds exchange anions to produce two new compounds. The general form of double replacement reaction isThe gener… Read More
2016-07-21 15:22
Single replacement reaction involves the reaction either of a metal with an aqueous solution or a metal with an acid aqueous solution.. It is called replacement reaction since the more… Read More
2016-07-17 09:48
In writing chemical equation, you must have knowledge in writing chemical formulas. Chemical formulas, symbols, arrow, + sign are part of chemical equation. Chemical equatio… Read More
2016-07-13 14:51
Solubility is a property of a substance that determines the ability of the solutes to dissolve in a given solvent. Solubility Rules is used to predict whether a particular salt is solu… Read More
2016-07-12 13:21
In writing chemical formulas you need to familiarize the different monoatomic and polyatomic ions.Below is provided for you: (Click here for pdf copy) Read More
2016-07-04 13:56
Activity Series of Metals is used to predict whether a reaction is possible or not in single replacement reaction. The metals including hydrogen are arranged from the most reactive met… Read More
2016-06-03 14:57
A. Binary Compounds of Metal and Nonmetal This compound is composed of metal and nonmetal. If you want to learn how to name this compound just follow the simple rule below… Read More
2016-06-02 15:16
A. Percent by Mass Sample Problems 1. What is percent by mass concentration of 12.5 g of NaCl dissolved in 200 g of water? &n&hell…Read More
2016-03-24 10:41
Click HERE for complete excel formatPhoto below is just a sample just click the excel format for complete forms.The forms are free for download Read More
2016-03-24 08:07
Click HERE for complete excel format Read More
2016-03-24 07:04
For pdf copy click HEREIf you want to edit pdf file and jpeg file click HERE Read More
2016-03-02 13:46
For pdf copy click HERE (Lesson Plan 1) HERE (Lesson Plan 2)Lesson Plan 1Lesson Plan 2 Read More
2016-03-01 12:24
Budget of Lesson pdf format (Ready for download) click HERE Read More
2016-02-27 08:46
For pdf copy click HEREActivity 1Heat and Internal EnergyActivity 2Where do I belong?Activity 3The Reverse of itActivity 4Start the Engine!Activity 5Fill me In Read More
2016-02-25 12:05
For pdf copy click HEREActivity 1 (What a Bunch of Grapes)Activity 2 (Bottled Balloons) Read More
2016-02-25 12:03
For pdf copy click HERE Activity 3: Just Go with the FlowActivity 4: Let's Organize!Activity 5: Pump It!Activity 6: The Rhythm of My HeartActivity 7: Cigarette Smoking is Dangerous to Your H… Read More
2016-02-25 12:00
For pdf copy click HEREActivity 1Monohybrid CrossActivity 2. Test CrossActivity 3. Dihybrid Checkerboard Callculationof Genotypes Read More
2016-02-25 11:57
For pdf copy click HEREActivity 1. Phenotypes and Genotypes in Incomplete DominanceActivity 2. Mystery BullActivity 3. What's your blood type? Activity 4. Boy or Girl?A… Read More
2016-02-25 11:55
For pdf copy click HEREActivity 1What are the structures involved in the food making process in plants?Activity 2Investigating the Leaf StomataActivity 3Evidence of PhotosynthesisActivity 4T… Read More
2016-02-25 11:51
For pdf copy click HERE Activity 1The Flame TestActivity 2Predicting the Probable Location of an ElectronActivity 3Electron Configurations Read More
2016-02-25 11:46
For pdf copy click HERE Activity 1Mapping the Periodic TableActivity 2Lewis SymbolActivity 3Bonding by Transfer of ElectronsActivity 4Bonding by Sharing of ElectronsActivity 5Bonding Among M… Read More
2016-02-25 11:40
For pdf copy click HERE Activity 1Organic Compounds: Are they Useful?Activity 2Properties of Common Organic CompoundsActivity 3The HydrocarbonsActivity 4Which bananas will ripen faster?Activ… Read More
2016-02-25 11:37
For pdf copy click HERE Activity 1Counting by Getting the Mass of an ObjectActivity 2Total Count Vs MassActivity 3The Mass of One of a SubstanceActivity 4The Relationship Among Number of Mol… Read More
2016-02-25 11:32
For pdf copy click HERE Activity 1Volcano Concept MapActivity 2Volcanoes in the PhilippinesActivity 3Under PressureActivity 4ViscosityraceActivity 5In and Out Read More
2016-02-25 00:45
For pdf copy click hereIf you want to copy the different activities here just click the activity then copy and paste in your bond paper. Enlarge your copy by dragging the edge of the a… Read More
2016-02-25 00:38
For pdf copy click hereActivity 1Characteristics of StarsActivity 2Patterns in the SkyActivity 3Apparent Movement of the Stars through the NightActivity 4Different Stars Patterns through the… Read More
2016-02-25 00:35
For pdf copy click hereActivity 1Roll, roll, and away!Activity 2Drop meActivity 3You raise me up!Activity 4Curve me on an inclineActivity 5Curve a likeActivity 6Investigating Momentum A… Read More
2016-02-25 00:32
For pdf copy just click hereActivity 1Little Shop of ToysActivity 2Hep Hep Hooray!Activity 3Bashing Ball!Activity 4Bouncy Balls, Revisited Read More
2015-09-26 01:22
Evaluation is an integral part of the learners. To test your ability or your students try the following questions about Photosynthesis and Cellular Respiration. … Read More
2015-06-21 20:44
FORMULAS:U = no. of students got correct in upper group / total 27% of the upper group of studentsL = no. of students got correct in lower group / total 27% of lower group of stu… Read More
2015-05-15 00:07
Why scientists are famous? Why they were able to create something? What did they use to create something? It's the power of their imagination. What is power of imagination?… Read More
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