Description : In a physical change some of the physical properties of the substance may be altered and the chemical composition?
Last Answer : In a physical change, the chemical composition of a substance is never changed.
Description : What is the name for a substance that alters the rate of chemical reactions, without being permanently altered itself?
Last Answer : ANSWER: CATALYST
Description : what All substances have characteristic properties. If one of these properties can be observed without changing the identity of the substance, it must be A. universal property. B. physical property. C. biological property. D. chemical property.?
Last Answer : B: Physical Property
Description : For a substance, density, solubility and melting point are examples of: w) physical properties x) amorphous properties y) chemical properties z) potential properties
Last Answer : ANSWER: W -- PHYSICAL PROPERTIES
Description : True or false .During a chemical change atoms are lost or gained to the new substance?
Last Answer : FALSE
Description : The isomers of a substance must have (a) same chemical properties (b) same molecular weight (c) same structural formula (d) same functional groups
Last Answer : same molecular weight
Description : What would be some possible effects, positive or negative, on life expectancy, if you genetically altered humans and animals to be able to digest and incorporate plastic into their physical makeup?
Last Answer : Erections lasting longer than 4 hours?
Description : Composite cost is inclusive of all cost of capital from all sources. A. True B. False
Last Answer : A. True
Description : The addition of any substance to water which leads to change in its physical and chemical characteristics is defined as water pollution. It results in
Last Answer : The addition of any substance to water which leads to change in its physical and ... Increased photosynthesis D. Increased turbidity and deoxygenation
Description : How could you use the physical properties of melting and boiling point to identify a substance?
Last Answer : The melting point and boiling point of a pure substance are veryspecific numbers; knowing these allows you to narrow down thepossible identity of the substance.
Description : The members of a homologous series have (a) The same physical properties (b) Different functional groups (c) The same chemical properties (d) Different methods of preparation
Last Answer : Ans:(c)
Description : A flat coil and solenoid has A. different fields B. same physical properties C. same fields D. same chemical properties
Last Answer : same fields
Description : Why do you itch enamel for composite restorations: A. To increase surface area B. To decrease surface area C. Does not really change the surface area D. Increase the chemical bonding capability E. Decrease the chemical bonding capability
Last Answer : A. To increase surface area
Description : A major difference between light cured and chemical cured composite is that during setting or in function the light cured material tends to:******** VERY IMP A. Seal the margins better and ... on time C. Undergo greater colour change D. Shrink more rapidly E. Posses greater fracture toughness
Last Answer : D. Shrink more rapidly
Description : In an isothermal process, the internal energy of gas molecules (a) increases (b) decreases (c) remains constant (d) may increase/decrease depending on the properties of gas (e) shows unpredictable behaviour.
Last Answer : Answer : c
Description : Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The ratio of chemical potential to free energy of a pure substance ... temperature and pressure is (A) 0 (B) 1 (C) ∞ (D) None of these
Last Answer : (B) 1
Description : With increase in porosity, the thermal conductivity of a solid substance (A) Increases (B) Decreases (C) Remains unchanged (D) May increase or decrease; depends on the solid
Last Answer : (B) Decreases
Description : With increase in temperature, the internal energy of a substance (A) Increases (B) Decreases (C) Remains unchanged (D) May increase or decrease; depends on the substance
Last Answer : (A) Increases
Description : If we increase the pressure on a substance (which is at its triple point), then the triple point (A) Increases (B) Decreases (C) Remains unchanged (D) May increase or decrease; depends on the substance
Last Answer : (C) Remains unchanged
Description : A catalyst remains unchanged at the end of the reaction with regard to (a) Quality (b) Chemical composition (c) Physical state (d) Quantity and chemical composition
Last Answer : Ans:(d)
Description : The clinical advantage of porcelain laminate veneers over composite resin veneers is: A. Color stability and resistance to abrasion B. Availability of self-curing or light activated placement (yes but not ... dentist's abilities) D. May be used in edge to edge occlusion or Class III relationships.
Last Answer : A. Color stability and resistance to abrasion
Description : In a physical change some of the substances in a material change but the properties if the material stay the same?
Last Answer : Need answer
Description : (4) None of these Explanation: Catalysis is the change in rate of a chemical reaction due to the participation of a substance called a catalyst. Unlike other reagents that ... may participate in multiple chemical transformations. Catalysts that speed the reaction are called positive catalysts.
Last Answer : Table salt gets moist during rainy season because – (1) sodium chloride is hygroscopic (2) sodium chloride is deliquescent (3) sodium chloride contains some quantity of sodium iodide (4) sodium chloride contains hygroscopic impurities like magnesium chloride
Description : Under certain circumstances, the gut may become a source of sepsis and serve as the motor of systemic inflammatory response syndrome. Microbial translocation is the process by which microorganisms ... intestinal mucosal permeability c. Decreased host defense mechanisms d. Lack of enteral feeding
Last Answer : Answer: a, b, c, d 99 Translocation is promoted in three general ways: 1) altered permeability of the intestinal mucosa as caused by shock, sepsis, distant injury, or cell toxins; 2) ... trauma patient d. Fifty percent of non-nitrogen caloric requirements should be provided in the form of fat
Description : Mark incorrect option related to Postcard a) Should not be folded, cut or altered and should be sent unenclosed b) Breach the conditions may be treated as letter and postage will be taxed ... forwarded taxed with double the deficiency. d) The amount recovered from sender after the delivery.
Last Answer : d) The amount recovered from sender after the delivery.
Description : Which of the following terms refers to altered sensation of orientation in space? a) Dizziness Dizziness may be associated with inner ear disturbances. b) Vertigo Vertigo is the illusion of ... of sound with internal origin. d) Nystagmus Nystagmus refers to involuntary rhythmic eye movement.
Last Answer : a) Dizziness Dizziness may be associated with inner ear disturbances.
Description : The disadvantage of heating the impression compound in a water bath is: A. It may become brittle B. It may become grainy C. Lower moles with constituents are leached out D. The plasticity of the compound may be altered E. All of the above
Last Answer : D. The plasticity of the compound may be altered
Description : Entropy of a substance remains constant during a/an __________ change. (A) Reversible isothermal (B) Irreversible isothermal (C) Reversible adiabatic (D) None of these
Last Answer : (C) Reversible adiabatic
Description : What are some physical and chemical properties of the element neon?
Last Answer : Feel Free to Answer
Description : What chemical/physical properties help compare fuels in combustion engines? and how to apply them.
Last Answer : The ratings for fuel energy, flame propagation, combustion speed are based on comparison with octane in gasoline and pentane or cetane (depending on the applicatton) for diesel or jet fuel.. ... are many textbooks on petroleum technology, the Wiki article and references give a good starting point.
Description : Classify minerals into two groups on the basis of chemical and physical properties and give one example of minerals of each group. -Geography
Last Answer : Minerals are classified on the basis of their physical properties and chemical properties such as: Metallic Minerals Metallic minerals are those that are rich in metals and a source to procure a variety of ... is rich in building stones i.e. sandstone, granite, marble, fuller's earth, and gypsum
Description : Why is melting wax a physical properties of flammability is a chemical property?
Last Answer : Melting is a physical property because the chemical composition remain unchanged.Flammability is a chemical property because involve a combustion reaction.
Description : Hydrogen differs from deuterium in __________ properties. (A) Radioactive (B) Physical (C) Chemical (D) All (A), (B) and (C
Last Answer : (B) Physical
Description : Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases. (A) Chemical properties (B) Physical properties (C) Degree of turbulence (D) Interfacial area
Last Answer : (A) Chemical properties
Description : Write three physical & three chemical properties of Hydrogen.
Last Answer : Ans. Physical Properties: (i) Colorless & Odorless gas (ii) Not soluble in water (iii) Low density than air Chemical Properties: (i) Reacts with active metal to form Hydrides (ii) Reacts with nonmetals to form different compound. (iii) Inert at room temperature.
Description : The basic difference between vegetable oils and fats is in their (A) Density (B) Chemical properties (C) Physical state (D) Composition
Last Answer : (C) Physical state
Description : Vegetable oils and fats basically differ in their (A) Density ranges (B) Physical state (C) Chemical composition (D) Chemical properties
Last Answer : (B) Physical state
Description : Law of octaves says that if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of elements
Last Answer : 7
Description : How are thermodynamic properties classified? A. Physical and chemical B. Intensive and extensive C. Real and imaginary D. Homogeneous and heterogeneous
Last Answer : Intensive and extensive
Description : A colligative property depends on: w) chemical properties of particles in system x) physical properties of particles in system y) number of particles present in system z) all of the above
Last Answer : ANSWER: Y -- NUMBER OF PARTICLES PRESENT IN SYSTEM
Description : How can you explain that even though you continue to add pure water into a substance even though the resultant pH might differ a little the acidity or alkalinity of substance still remains the same to?
Description : With the increase of pressure, the boiling point of any substance - (1) Increases (2) Decreases (3) Remains Same (4) Becomes zero
Last Answer : (1) Increases Explanation: The temperature stays the same until all the liquid has vaporized. As the temperature of a liquid rises, the pressure of escaping vapor also rises, and at the boiling point ... vapor is equal to that exerted on the liquid by the surrounding air, causing bubbles to form.
Description : With the increase of pressure, the boiling point of any substance – (1) Increases (2) Decreases (3) Remains Same (4) Becomes zero
Description : Who change the address in the program counter and cause the flow of control to be altered: a Shift manipulation b. Circular manipulation c. Program control instruction d. __ Allof these
Last Answer : c. Program control instruction
Description : Most hormone receptors are localized on the cell membrane and transduce hormone binding into altered levels of intracellular messengers. A limited number of intracellular receptors do exist. Which of ... protein serves as an inhibitor protein blocking the DNA-binding domain of the steroid receptor
Last Answer : Answer: a, d Although most hormone and other messenger receptors are extracellular, intracellular receptors have been identified. The hormone messengers involved for these receptors are primarily ... DNA-binding domain of the receptor. Activation involves the dissociation of the inhibitor protein
Description : Following statement is true about lidocaine (a) Reduce the slope of Phase 4 (b) Threshold excitability is not altered (c) Action potential is not affected (d) All of the above
Last Answer : Ans: A
Description : The following is not true of the cytochrome P450 isoenzyme CYP2D6: A. It generates the hepatotoxic metabolite N-acetyl benzoquinone immine from paracetamol B. It is involved in demethylation of ... for poor capacity to hydroxylate many drugs including metoprolol D. It is inhibited by quinidine
Last Answer : A. It generates the hepatotoxic metabolite N-acetyl benzoquinone immine from paracetamol
Last Answer : A. It generates the hepatotoxic metabolite N-acetyl benzoquinone immine from paracetamo
Description : Sensitivity to hot and cold foods soon after cavity preparation and placement of GIC and composite resin in an upper incisor tooth is due to: A. Mechanical trauma due to cavity preparation B. Chemical C. Heat from GIC settings
Last Answer : A. Mechanical trauma due to cavity preparation