9) Physical or Chemical? a) Unsaturated fats are liquid – b) O2 binds with Hgb

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9) Physical or Chemical?
a) Unsaturated fats are liquid –
b) O2 binds with Hgb

9) Physical or Chemical?
a) Unsaturated fats are liquid –
b) O2 binds with Hgb –
c) metal in hip joint implants is not corroded –
d) antacid tablet neutralizes acid –
e) Melanin pigment is brown –
11) Alcohol (l) is frozen to solid, then melt back. Have the molecule been changed by the process?
15) Hydrogen Peroxide H2O2 can be changed to water H2O and oxygen O2. Use the term homoatomic or heteroatomic to classify hydrogen peroxide.
23) classify as homogeneous or heterogeneous (mixture)?
a) muddy water – b) gelatin – c) normal urine – d) smog-filled air – e) an apple –
f) mouthwash – g) petro jelly –
37) 25km –> miles (1km=0.621 miles)
25 km x 0.621 mile
1km
38) mass 4.0kg –> pounds (1kg=2.2 pounds)
4.0kg x 2.2pounds =
1 kg
47) Which ones are incorrect in terms of scientific notation expression? Try to write the correct way (optional).
a) 4.2×103. b)6.8×104. c) 202×10-3 = 2.02×10 d) 0.026×10-2 = 2.6×10-4. e) 1×10-2 f) 74.5×105 = 7.45×10 6
54) ** Calculator work. Do the multiplication, and express answers in scientific notations. (8.2×10^-1)(1.1×10^-2) = 9.02×10-3
56) Use calculator to find your answer directly.
a) (144)(0.0876) = (1.44×102)(8.76×10-2) =
58) Use calculator to find your answer directly.
3.1×10^-3
(1.2×10^2)
77b) 3.0 yard x 1m = 2.74 m

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