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Which statement is true about pure substances?
Select the correct answer below:
Only elements are considered pure substances.
Pure substances can be separated further by physical means.
All pure substances are made of only one type of atom.
Both compounds and elements are types of pure substances.
Both compounds and elements are types of pure substances. >>>>>answer
Element is pure substance it is made by single atom.
compound is combination of two or more than two atoms . Compound is pure substance. Compound is separated by chemical methods.
Both compounds and elements are types of pure substances. >>>>answer
Which statement is true about pure substances? Select the correct answer below: Only elements are considered...
Which statement is true about a racemic mixture? TV Select one: O a. The specific rotation equals zero ob. Both enantiomers are present in equal amounts O c. The bp of the racemic mixture is equal to the bp of the pure enantiomers Od. All of the above
Which of the following statement is not true about interest rate risk? (Only one correct answer.) Select one: a. Long term bonds have higher interest rate risk than short term bonds. ob. Interest rate risk is the uncertainty of how the bond price will change following the interest rate changes. c. Lower coupon bonds have lower interest rate risk. d. Bond prices are negatively related to interest rate movements.
help solve please Which statement is not true (meaning False) about the virus capsid? Select one: O a. Because the capsid is not essential to the virus, it's not a useful target for antiviral drugs. b. The capsid is made of one or more types of protein subunits. O c. The capsid determines the shape of the virus. O d. The capsid functions as a package for the viral genetic material. O e. Both bacteriophage and animal viruses have capsids....
Which of the following is a true statement about residuals? Choose the correct answer below. 0 A. The regression line is the line that minimizes the standard deviation of the residuals. O B. The residual plot for a model that a good fit to the data should not show any pattern or have any unusual features. O C. A residual is the difference between the actual data value and the value predicted by the model 0 D. All of the...
Choose the true statement(s) about keratitis. To be marked correct, you'll need to select all true statements, as there may be more than one correct answer. Keratitis is severe inflammation of the cornea. Protozoan keratitis is caused by Acanthamoeba Keratitis is less serious than conjunctivitis and does not warrant medical attention. Keratitis can be caused by viral, bacterial, fungal, and parasitic species.
Select true or false for each statement below. True False Electron states are described by orbits, which indicate exactly where an electron is located in an atom. True False The energy levels of all atoms except hydrogen are quantized. True False Electrons move in elliptical orbits around the nucleus of an atom. True False Atoms can gain energy by absorbing a photon. True False When atoms are in an excited state, they can release this energy by emitting light.
Which group of elements includes the most reactive of all the metallic elements? alkali metals alkaline earth metals coinage metals (Group 1B) transition metals Group 2B metals Determine all of the covalent hydrides from the compounds listed below. CaH2 H2S SiH4 I only II only I and II I and III II and III Based on the following options, select the substance with hydrogen in the +1 oxidation state. KH CH4 H2 AlH3 SrH2 Which of these substances is being...
Choose the true statement(s) about coenzymes. To be marked correct, you'll need to select all true statements, as there may be more than one correct answer. An example of a coenzyme is FAD. An example of a coenzyme is NAD+. Inorganic, non-protein cofactors are typically called coenzymes. Coenzymes are often vitamins or are made from vitamins. Arsenic is a toxic metalloid that is known to interfere with cellular metabolism. Your patient (a 3-year old female) ingested a toxic amount of...
Which of the following statements is NOT true about phenol? Select the correct answer below: The aromatic ring delocalizes and stabilizes the negative charge on the oxygen in the phenoxide ion. Therefore, phenols completely dissociate in water. A phenol will generally form stronger hydrogen bonds than nonaromatic alcohols because the oxygen-hydrogen dipole in the hydroxyl group is stabilized by resonance from the aromatic ring. The phenol functional group is a weak acid in water because the hydroxyl group dissociates slightly....
Which statement about generation of reactive oxygen species below is NOT correct? Select one: a. Hydroxyl radical is formed from hydrogen peroxide O b. Hydroxyl radical can react with lipides O c. Hydroxyl radical can react with DNA and proteins O d. Hydroxyl radical react with hydrogen peroxide O e. Hydroxyl radical react with glutathione Check Estimate how many molecules of ATP is produced from complete oxidation of 1 molecule of tyrosine Answer: Check Which statement about generation of reactive...