3) Identify a gas. 3) A) iron B) mercury C) silver D) hydrogen E) phosphorus ) W

Question

3) Identify a gas. 3) A) iron B) mercury C) silver D) hydrogen E) phosphorus ) Which of the following are examples of physical change? 4) A) Ice melts B) Dry ice sublimes C) Powdered fruit drink is dissolved in water D) Coffee is bre wed E) All of these are examples of physical change. 5) Choose the pure substance from the list below 5) A) wine B) lemonade C) juice D) air E) salt 6) Which of the following statements is TRUE? 6) A) A scientific law summarizes a series of related observations B) A hypothesis is speculation that is difficult to test C) Once a theory is constructed, it is considered fact. D) An observation explains why nature does something. E) A scientific law is fact. 7) A mass of mercury occupies 0.950 L. What volume would an equal mass of ethanol occupy? The 7) density of mercury is 13.546 g/mL, and the density of ethanol is 0.789 g/mL A) 0.0613 L B) 0.0553 L C) 18.1 L D) 16.3 L 8) Identify absolute zero. A) 212 degrees Fahrenheit C) 0.00 degrees Celsius B) -273 degrees Celsius D) None of the above

Explanation / Answer

3)
hydrogen exist as H2 in gaseous form
Rest all are either solid or liquid
Answer D

4)
Physical change involves change of state
there is no chemical reaction taking place.
All of them are physical change only
Answer: E

5)
salt is NaCl
rest all are mixture
Answer: E

I am allowed to answer only 1 question at a time

Related Questions

Navigate

• Browse (All)
• Browse 3
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.