SCIENCE periodical test reviewer

• Who among the following stated that at constant pressure in a fixed amount of gas, its volume is directly proportional to the kelvin temperature?


  Jacques Charles
• What law manifest the use of sky lantern?


  Charles law
• If a sealed container increases the pressure exserted on the fixed amount of gas and volume, what will be the probable effects?

  Increase temperature
• The air inside a tire pump occupies a volume 130.0 cubic centimeters at a pressure of one atmosphere. If the volume decreases to 40.0 cubic centimeters, what is the pressure, in atmospheres, inside the pump?


  3.35 atm
• A gas occupies a volume of 20 cubic meters at 9,000 pascals. If the pressure is lowered by 20%, what volume will the gas occupy?


  25 cubic meters
• A balloon holds 20 liters of helium at 10°C . If the temperature increases to 50°C , and the pressure does not change, what will be the new volume of the balloon ?


  22.83 liters
• Determine the original volume of a 25 liters gas at constant pressure if the temperature rises from 40°C to 60°C.


  23.5 liters
• A 12.5 liters scuba tank holds of oxygen at a pressure of 202.6 kPa. What is the original volume of oxygen at 101.3 kPa the is required to fill the scuba tank?


  2.5 liters
• Which law best explain why our lungs expand during inhalation and contract as we exhale?

  Boyle's law
• Which best explain how a pressure cooker is able to cook at a faster rate?


  Gay-Lussac's law
• Antioxidants applied to food products prevent the browning effect. What is the role of enzymes in the browning food like fruits and vegetables?


  positive catalyst
• Which is not true about the functions of proteins?

  Defend the body against diseases
• Sucrose is a disaccharide made up of _____.

  Glucose and fructose
• What is the most abundant biomolecule on earth?

  Carbohydrates
• Which of the following sugars are the components of maltose?

  glucose and glucose
• The sugar in RNA is _____, the sugar in DNA is_____?

  ribose, deoxyribose
• From the equation below, what coefficient for K is needed to balance the equation

  $KOH +$$CO2 --> K2CO3 +$$H2O$
• From the equation below, what coefficient for K is needed to balance the equation? KOH + CO2 ---> K2CO3 + H20


  2
• What are the products in the equation below? Zn + CuSO4 ---> ZnSO4 + Cu


  ZnSO4 and Cu
• The of reaction increases as the temperature increases. Which of the following statements provide the best explanation for this?

  At higher temperature the particles have more energy, move faster, and collide more often
• Which is true about disaccharides?

  They are formed when two simple kinds of sugar are joined together.
• Which of the following is a good diet for a person with heart ailment?

  diet high in unsaturated fatty acids
• Which is best explain how to have bigger bread or cake compare to a dough?

  Avogadro's Hypothesis
• A gas confined in a closed container is heated. What will happen to the gas?

  The gas molecules move faster
• The following correctly describe the kinetic molecular theory of gas EXCEPT

  The gas molecules move slowly in all direction
• Which of the following scenario will NOT likely to happen when gas molecule collides?

  They stick together
• Which of the following represents a mole?

  3.01 x 1023 Ag atoms in a silver jewelry
• Which of the following statements best describes a chemical reaction?

  Chemical reaction is accompanied by energy changes
• From the equation 2 Mg + O2 ---> 2 MgO, 2 Mg + O2 represents?

  Reactant
• 2 Mg and O from the given equation 2 Mg + O2 ---> 2 MgO represents

  Product
• The unbalanced chemical equation for the reaction in which carbon monoxide burns in oxygen to carbon dioxide is

  CO + O2 ---> CO2
• An equation is balanced by ___

  adding coefficients
• These are number placed before the symbol or formula Acid-base


  Coefficient
• What is the correct sequence in balancing equation

  1. Apply the law of Conservation of mass to get the same number of atom 2. Take note of the elements in the reactant and in the product 3. Count the number of atoms of each element presents in the reactant and product

  II, III, I
• A reaction that has two compounds as reactants and two compounds as products might be described____. A. decomposition reaction B. combination C. double replacement D. single replacement

  C. double replacement