Which Numerical Setup Can Be Used to Calculate

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31 Which electron configuration represents the electrons in an atom of calcium in an excited state?

(1) two�8�viii             (3) two�7�8�1

(ii) 2�8�eight�ii        (four) 2�vii�viii�three

4   calcium ground country 2-eight-8-2  move an electron up to brand it excited

2�seven�8�iii

32 The table below gives the diminutive mass and the affluence of the two naturally occurring isotopes of bromine.

Which numerical setup tin can exist used to calculate the atomic mass of the element bromine?

(1) (78.92 u)(l.69) + (lxxx.92 u)(49.31)

(2) (78.92 u)(49.31) + (80.92 u)(50.69)

(3) (78.92 u)(0.5069) + (80.92 u)(0.4931)

(4) (78.92 u)(0.4931) + (80.92 u)(0.5069)

three weighted boilerplate

(mass x percent as a decimal) + (mass 10 percent equally a decimal)

33 Given the formulas of two substances:

These diagrams represent substances that have

(1) the same molecular structure and the same physical properties

(two) the aforementioned molecular structure and different physical properties

(3) unlike molecular structures and the same physical properties

(iv) different molecular structures and dissimilar physical properties 4 dissimilar substances have different molecular structures and different physical properties

34 What is the chemic formula of titanium(Two) oxide?

(1) TiO                   (three) TiO_two

(two) Ti₂O                  (4) Ti₂O₃

i TiO

Ti= ii+   O= two-

35 Which equation shows conservation of mass and energy for a reaction at 101.3 kPa and 298 M?

(one) 2H₂(thousand) + O_ii(1000) → 2H_twoO(g)  + 483.vi kJ

(2) 2H_two(g) + O₂(g) → 2H_iiO(ℓ)  + 285.8 kJ

(3) H_two(one thousand) + O₂(grand) → H₂O(m)  + 483.vi kJ

(4) H_two(g) + O_ii(thousand) → H₂O(ℓ)  + 285.8 kJ

1 TABLE I

Delta H is negative...energy goes on the right side

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Source: http://www.kentchemistry.com/RegentsExams/regents_aug_2017_31_35.htm

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