The most accepted theory about the formation of the universe which explains that it continues to expand _______________., big bang theory, divine creation theory , The following are light elements EXCEPT;, helium, hydrogen, lithium, iron, Light elements such as hydrogen and helium are formed through the process of __________ nucleosynthesis.‎, fusion, Stellar, Which element is the lightest and at the same time the most abundant in outer space?‎, hydrogen, helium, What element can be formed when three atoms of helium are fused?‎, carbon, hydrogen , Which of the following terms refer to the ability of an atom in a molecule to attract shared electrons?, Electron affinity, Electronegativity, What type of chemical bond holds the atoms of water molecule together?, Ionic bond, Hydrogen bond, Which of the following molecule is nonpolar?, NaCl, NH3, HCl, CO2, Which of the two pairs has the lowest electronegativity difference value?, H-N, Na-Cl, What is the type of chemical bond present in a hypothetical molecule which has an electronegativity difference of 0.5?‎, Polar covalent, Nonpolar covalent, Which of the following intermolecular forces of attraction (IMFA) is arranged from strongest to weakest?, H-bonding – dipole-dipole – London forces, H-bonding – London forces – dipole-dipole‎, Which among the choices refers to the resistance of a liquid to flow?‎, solubility , viscosity, Which of the following will dissolve in polar solvents?, ionic compounds and polar covalent compounds, nonpolar solvents and covalent compounds, Which of the following is NOT TRUE about water? It _____________.‎, becomes denser when freezes, has high surface tension, What is the ability of a substance to be dissolved in another substance to form a solution?, boiling point, solubility, Which forces of attraction or repulsion are responsible for the bulk properties of different substances?, covalent, intermolecular, Why do larger atoms experience increased polarizability than smaller atoms?, The electrons are loosely held in larger atoms so electron distribution is easier to distort., The electrons are tightly held in larger atoms so electron distribution is easier to distort.‎, How is instantaneous dipole best described?, It is the strongest attractive force between and among molecules., It results to the formation of temporary dipoles induced to atoms or molecules.‎, London dispersion forces are a function of the molar mass of substances. What happens to the dispersion forces of the molecules as the molar mass increases?, They are increased., They are decreased., At any certain time the shift in the position of the electrons in an atom will likely create temporary positive and negative poles. Which among the following is this kind of dipole? , dipole moment, dispersion forces, How is the ability of water molecules to move against gravity referred to?, capillary action, surface tension, Substances like heavy syrup and molasses flow slower than water. How is the ability of these substances to resist flow called?, surface tension, viscosity, What is the term that pertains to the pressure exerted by the vapor from the evaporation of a liquid or solid above a sample of the liquid or solid in a closed container ? , surface tension, vapour pressure, ‎The atmospheric pressure on top of a mountain is lower than at sea level. As a consequence, what will happen to the cooking time of an egg on top of the mountain?, The egg will cook at a longer time due to a lower boiling temperature., The egg will cook at a shorter time due to higher boiling temperature., ‎Sodium chloride is completely soluble in water. What is responsible for its solubility in water?, The presence of charged ends in NaCl enables dipole-dipole interaction with water., London dispersion forces in NaCl predominate leading to strong dipole interactions with water., Which biomolecular group carries and passes on the hereditary information of the organism?, nucleic acids, proteins, Atom is the basic unit of a chemical element. What are the atoms that make up carbohydrates?, C, H and O, C, H, O and N, Which organic molecule gives fast source of energy?, carbohydrates, lipids, Which of the following is considered as the building blocks of protein?, amino acids, nucleic acids, Which of the following is a monosaccharide which is used in dextrose?, glucose, lactose, A chemical change that occurs when two or more substances combine to form a new substance., Product, Chemical Reaction, The number of particles present in a given volume of solution., Catalyst, Concentration, The measure of how fast or slow a reaction happens., Particle Size, Rate of Reaction, Condition that needs to be met for a chemical reaction to occur., Particles should maintain a certain distance to each other., Particles in the substance must collide and have enough energy., The factor that will slow down the rate of chemical reaction., Placing products in iced water., Placing reactants in ice bath., The substance formed as a result of a chemical reaction., Product, Reactant, How does a catalyst work in speeding up a reaction?, by lowering the activation energy or reaction., by giving them more energy., How is catalyst different from a reactant?, Adding more catalyst speeds up the rate of reaction., Adding more catalyst slows down the rate of reaction., The rate of a chemical reaction is NOT affected by which of the following?, Temperature, Particle size , Concentration, All of these affect reaction rate, Which of the following will lower the rate of reaction?, Adding an enzyme to the reaction., Decreasing the temperature from 40oC to 10oC., The minimum amount of energy needed for colliding particles to react is called the ________., Activation Energy , Chemical Energy , In the equation Mg + O2 → MgO, how many molecules of Mg on the reactant side do we need to make our equation balance?, 1, 2, It deals with the process that involves rearrangement of the molecular or ionic structure of a substance to form a new substance or product., chemical symbol , chemical reaction, Use the following BALANCED equation: 2C2H6 + 7O2→ 4CO2 + 6H2O If 15 g of C2H6 react with 45 g of O2, how many grams of water will be produced?, 22 g H2O, 23 g H2O , What is the limiting reactant in the equation in item number 43?, O2 (maliit na 2 ito), C2H6 , It is reactants that are not used up when the reaction is finished., limiting reagents, excess reagents, Energy that comes from sources that will run out or will not be replenished in our lifetimes—or even in many, many lifetimes., potential, renewable, It refers to the organic matter from plants and animals (microorganisms)., biomass, battery, This form of energy includes hydrocarbons such as coal, oil, and natural gas that comes from organic remains of prehistoric organisms., batteries, fossil fuels, This source of energy is also known as “The People’s Power” referring to the easy deployment of solar panels and the introduction of “community solar gardens” where energy is shared among owners., hydroelectric, solar energy , Which of the following converts the kinetic energy of falling water into mechanical energy?, steam, turbine, This is the type of cleaning products which many of the ingredients can be manufactured from plants., detergent products, dishwashing liquid, Most of the cleaning materials have active ingredients but different materials, what bleaching agent contains active ingredient that can remove stains?, magnesium, chlorine, This cleaning product provides the chemical energy to help clean and remove food soil from different types of cooking and serving items., dishwashing liquid, detergent products, Sodium hydroxide and ___________ are the most commonly used alkali in soap and detergents., magnesium hydroxide, potassium hydroxide, In using cleaning products, one must remember some precautionary measures. Choose the best answer., Read the instructions carefully before using the product., Wear appropriate protective equipment when using the product., A and B., B only, Aside from the active ingredient, there are also other ingredients included in cleaning agents. This ingredient helps in keeping the minerals out of the way of the surfactants., fragrance, Builders, Depending on the chosen ingredient used in a product, what is the ingredient that helps to be more effective on certain microbes?, antibacterial, enzymes, Adding of this ingredient in a certain liquid cleaning agent will decrease the viscosity of the liquid. What is this ingredient?, solvents, thickener, Many people feel bubbles show that a product is working. What is the ingredient that creates suds in a cleaning agent?, dye, foam enhancer, What ingredient has the power to break down stains like in digestive system which helps break down the food we eat?, enzymes, fragrance.

PHYSCI REV🐱👩‍🔬

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