Science 4

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Cards (36)

  • Gases -is the content solid, liquid or gas
  • Liquidfied petroleum gas (Lpg) is a Fuel providing energy that can be found in our everyday life as it is Used in many household of appliance for cooking heating and hot water. IT is called Liquidfied gas because it is easily transformed into a liquid.LPG needs only low pressure or refrigerator to change it into liquid from it's gaseous state
  • It is used in many household appliances for cooking heating and hot water it is called
    Liquidfied gas
  • Where does liquidfied petroleum gas come from?
    Drilling wells, processing transport packaging, vaporization,gas regulators and the gas appliances themselves are all part of the LPG supply chain LPG is Extracted From oil and gas wells. Hydrocarbon,such as crude oil and natural gas. Natural gas production and petroleum extraction are used to make LPG
  • Propate companies add harmless chemical called Mercaptan to give it it's distinctive " rotten egg" smell
  • The Force per unit area of the balloon is the pressure of gas
  • Gases - such in Earth atmosphere exert pressure on any surface with which they into contact "The standard Atmosphere Pressure is the Pressure exerted by the Atmosphere at sea level under normal weather conditions
    It's value is 1atm
  • Pressure of gases
    The PSI unit of pressure is the Pascal (Pa) name after french scientist and mathematics Blaise Pascal
    1 pa=1 n/m²
    Other units of pressure are ATM, Torr,Barr ,millimeter mercury (mmHg) and pounds per square inch (Ib/in²) Psi
  • Gas laws
    • Amount of gas (n) usually expressed in moles
    • Pressure (p)
    • Temperature (T)
    • Volume (V)
  • which is a principle in chemistry that describes the relationship between the volume and temperature of a gas.
    Charle's Law
  • Charles' Law was formulated by the scientist Jacques Charles in 1800,
  • An English chemistry is wisely considered to be one of founders m
    Of modern experiental science of chemistry
    Robert Boyle- Bowl's law
  • Bowl's law
    Constant- Mass
    Pressure  and volume are inversely proportional
    Density- pressure and density are directly proportional
    P¹V¹-P²V²
  • Charles law
    • Constant- pressure
    Temperature and volume are directly proportional
    Density- inversely proportional to temperature
    V¹/T¹ . V²/T² = V¹T²-V²T¹
  • At constant T as pressure increases , volume decreases
    Boyle's Law
  • At constant P as volume increases , temperature increases
    Charle's law
  • A chemical reaction forms a new products
    Chemical change
    • Combustion
    • Rotting
    • Rusting
    • Digestion
  • Matter change form but not the chemical identity
    Physical change
    • Melting
    • Boiling
    • Shredding
    • Chopping
  • Difference between the physical and chemical changes
    Physical change
    • Physical change only effect physical properties
    • Physical change produce no energy
    • Physical change produce no new substances the atoms are arrange the same way in the reactants and products
    • Physical change are generally easy to reverse
  • Difference between the physical and chemical changes Physical change
    Chemical change
    • Chemical change will effect both physical and chemical properties
    • Chemical change produce energy generally in the form heat, light or sound
    • Chemical change can produce new substances the atoms rearrange and form new compound
    • Chemical change are not easy reversible without an additional Chemical reaction
    • 1 atm-760 mmHg
    • Torr- 760
    • Kpa- 101.325
    • Pa- 101. 325
    • Bar - 1.013
    • 14.7Ib/in²
  • Boyle's law Pressure -volume relationship
    1.in a 35.OL outomibile airbag, a sample of gases gaseous nitrogen has a pressure of 745hg. If this sample is transffered to a 25.ol bag at he same temperature what is the final pressure
    •  P¹=745mmhg
    • V¹=35.OL
    • p²=1043mmhg
    • V²=25.oL
    =1043mmhg
    2. 2.OL of gas is at 740.0 hmmhg pressure what is it's volume at 760mmhg pressure
    • P¹=740.0mmhg
    • V¹=2.oL
    • P²=760mmhg
    • V²=1.947L
    =1.947L
  • 3. 3.0oL of a gas is at 740.0mmhg pressure what it's volume at standard pressure
    • P¹=740.0mmhg
    • V¹=3.0oL
    • P²=760mmhg
    • V²=2.92L
     =2.92105263
    4.A gad occupies 12.3 L at a pressure of 40.00mmhg what us the volume when the pressure is increased to 60mmhg?
    • P¹=40.0mg
    • V¹=12.3L
    • P²=60.mmhg
    • V²=8.2L
    =8.2L
  • Charles law: temperature volume relationship
    1. In a gas tight syringe a sample of carbon dioxide occupies a volume of 25.OmL at 20.0⁰C what will be the final volume of the gas if the syringe is held by a warm hand that cure the temperature to rise to 37.0⁰C
    V¹T²-V²T¹ convert Ang Celsius o tct 273.15
    • V¹=25.0ml
    • V²=26.44ml
    • T¹=20.0⁰c
    • T²=37.0⁰c
    =26.44ml
  • Charles law
    A gas in a container has a initial volume of 2l and an initial temperature of 25⁰C the final volume decrease to 0.25L what us the final temperature
    T¹=298.15k
    T²=37.268k
    V¹=2L
    V²=0.25L
    =37.268k
  • "To convert"
    C--°F = (9/5 x⁰C)+32
    F--C= 5/9 x (⁰f-32)
    C--k= ⁰C+273
    K--⁰c = k-273
  • To convert
    1. Convert 45⁰C to F
    =113⁰F
    2. Convert 68⁰F to ⁰C
    =20.16⁰C
    3.Convert 45⁰C to K
    =318k
    4.convert 32k to ⁰C
    =-241⁰c
    5.Convert Body temperature of 98.6⁰f to ⁰c
    =37.296⁰c
    6.the body temperature of a cat is 101.5⁰ Find this temperature in Celcius
    =38.92⁰C
    7.convert 63⁰c to f
    =145.4⁰F
    8. Convert 25⁰C to K
    =298k
    9. Convert 98K to ⁰C
    =-175⁰C
  • Balancing equation
    1. 1 P⁴+ 3 O² --> 2 P²O³
    2. 2 AI+ 6 HCI --> 3 H²+ 2 AI CI³
    3. 1 Na³PO⁴+ 3 KOh --> 3 NaOH+ 1 K³PO⁴
    4. 2 Na³PO⁴+ 1 CaCI² -->NaCi+ 2 Ca³(PO⁴)²
    5. 2 Na³PO⁴+ 3 CaCI² --> 6 NaCI+ 1 Ca³(PO⁴)²
    6. 2 LiCI+ 1 Br² --> 2 LiBr+ 1 CI²
  • Different types of Gas Law Formula
    Bowl's law =P¹V¹-P²V²-PV=k
    Charles law=V¹/T¹ . V²/T²= V¹T²-V²T¹
    Guy lussac=P¹/T¹ . P²/T²= P¹T²-P²T¹
  • Occurs when two or more substances reactants combine and form a compound product
    Combination reaction
    A+B --> AB
  • Occurs when a single compound breaks down two or more simpler product
    Decomposition
    AB --> A+B
  • One element replace another element in a compound
    Single Displacement
    AB+X --> AX+B
  • This involves enhancing of oous to form new compounds
    Double displacement
    AB+XY --> Ax+By
  • Chemical reaction
    • A.Combination
    • B.decomposition
    • C.Single displacement
    • D.double Displacement
    A Mg+O² --> MgO
    B AI²O³ -->, AI+O²
    A H²+N² --> NH³
    D CuCI²+H²S --> CuS+HCI
    A C+H²-->CH⁴
  • balancing equation
    sell
    A) coefficient
    B) reactants
    C) chemical formula
    D) product
    E) reaction arrow
    F) subscript
    G) synbol
  • chemical change and physical change
    .
    A) chemical change
    B) combustion
    C) rotting
    D) rusting
    E) digestion
    F) melting
    G) shredding
    H) boilling
    I) chopping
    J) physical change