I need help with the following science questions:
29) The color, age, and temperature of a star is determined mostly by the
A. the magnitude of the star
B. closeness of the star to the center of a galaxy
C. point at which the star is in its life cycle
D. distance the star is from Earth
33) The products in a chemical reaction always
A. retain some of the characteristics as the reactants
B. have higher melting and boiling temperatures than the reactants
C. have different properties than the reactants
D. can be separated back into the reactants with a second chemical reaction
35) Which statement is true about the boiling point of a particular substance X?
A. at the same pressure, it is always the same
B. it is always the same
C. it is the same temperature as the melting point
D. it can be easily lowered by cooling the substance first
38) When sodium hydroxide (NaOH) is mixed with hydrochloric acid (HCL), a chemical reaction takes place. Which formula shows the products?
A. NaCL + H(subscript 2)O
B. Na + OH + H + CL
C. HNaH + HCL
D. CLNA + O(subscript 2)H + NaOH
53) If you put water, ethyl alcohol, cooking oil, and corn syrup into a jar, they will form layers. Which of these is the correct order of the layers from bottom to top?
A. water, cooking oil, ethyl alcohol, corn syrup
B. corn syrup, water, cooking oil, ethyl alcohol
C. ethyl alcohol, cooking oil, water, corn syrup
D. cooking oil, corn syrup, water, ethyl alcohol
55) A student hypothesizes that because a rainbow appeared after a heavy rainfall, stretching from point A to point B on the horizon on 2 separate occasions, a rainbow will always appear between point A and point B after a heavy rainfall. How valid is this conclusion?
A. It is valid because it used an observation and a test to verify a testable hypothesis.
B. It is invalid because at least one more incidence is needed for the data.
C. It is valid because it is based on the scientific method.
D. It is invalid because the results cannot be independently and consistently reproduced.
Help is greatly appreciated.
29) The color, age, and temperature of a star is determined mostly by the
A. the magnitude of the star
B. closeness of the star to the center of a galaxy
C. point at which the star is in its life cycle
D. distance the star is from Earth
33) The products in a chemical reaction always
A. retain some of the characteristics as the reactants
B. have higher melting and boiling temperatures than the reactants
C. have different properties than the reactants
D. can be separated back into the reactants with a second chemical reaction
35) Which statement is true about the boiling point of a particular substance X?
A. at the same pressure, it is always the same
B. it is always the same
C. it is the same temperature as the melting point
D. it can be easily lowered by cooling the substance first
38) When sodium hydroxide (NaOH) is mixed with hydrochloric acid (HCL), a chemical reaction takes place. Which formula shows the products?
A. NaCL + H(subscript 2)O
B. Na + OH + H + CL
C. HNaH + HCL
D. CLNA + O(subscript 2)H + NaOH
53) If you put water, ethyl alcohol, cooking oil, and corn syrup into a jar, they will form layers. Which of these is the correct order of the layers from bottom to top?
A. water, cooking oil, ethyl alcohol, corn syrup
B. corn syrup, water, cooking oil, ethyl alcohol
C. ethyl alcohol, cooking oil, water, corn syrup
D. cooking oil, corn syrup, water, ethyl alcohol
55) A student hypothesizes that because a rainbow appeared after a heavy rainfall, stretching from point A to point B on the horizon on 2 separate occasions, a rainbow will always appear between point A and point B after a heavy rainfall. How valid is this conclusion?
A. It is valid because it used an observation and a test to verify a testable hypothesis.
B. It is invalid because at least one more incidence is needed for the data.
C. It is valid because it is based on the scientific method.
D. It is invalid because the results cannot be independently and consistently reproduced.
Help is greatly appreciated.
