When a metal is heated in a flame, the flame

Jan 16th, 2015
Anonymous
Category:
Engineering
Price: $20 USD

Question description

1. When a metal is heated in a flame, the flame

has a distinctive color. This information was

eventually extended to the study of stars because

A the color spectra of stars indicate which elements are present.

B a red shift in star color indicates stars are moving away.

C star color indicates absolute distance.

D it allows the observer to determine the size of stars.

2. Why is cobalt (Co) placed before nickel (Ni) on the periodic table of the elements even though it has a higher average atomic mass than nickel? A Nickel has one more proton.B Cobalt was discovered first.C Nickel has fewer electrons.D Cobalt has a lower density.

3. Generally, how do atomic masses vary throughout the periodic table of the elements? A They increase from left to right and top to bottom. B They increase from left to right and bottom to top. C They increase from right to left and top to bottom. D They increase from right to left and bottom to top.

4.

Iodine would have chemical properties most like A manganese (Mn). B tellurium (Te). C chlorine (Cl). D xenon (Xe).

5.

Which of the following elements is classified as a metal? A bromineB heliumC sulfurD lithium

6.

Which of the following atoms has the largest

atomic radius?

A barium (Ba) B chlorine (Cl)C iodine (I)D magnesium (Mg)

 

7 Which of the following atoms has six valence

electrons?A magnesium (Mg)B silicon (Si)C sulfur (S)D argon (Ar)


8 Which statement best describes the density of

an atom’s nucleus?

A The nucleus occupies most of the atom’s volume but contains little of its mass.

B The nucleus occupies very little of the atom’s volume and contains little of its mass.

C The nucleus occupies most of the atom’s volume and contains most of its mass.

D The nucleus occupies very little of the atom’s volume but contains most of its mass.

 


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