need help please Potassium reacts with wster more quickly tun calcium reacts wit

Question

need help please

Potassium reacts with wster more quickly tun calcium reacts with water b) The electrical conductivity of aluminanm is greater than copper d) The solubility of NaCl in hot water is greater than the solubility in cold e The boiling point of water is greater than the bolling point of ethanol. Answer is letter E 2)r (2 pts.) A sheory is a mathematical formula that models a penem of behavior b set of qusntitative data well-tested unifying principle thst explains a body of facts A tentative explaration or prédication besed upon experimestal observations set ofexperiments designed to test D theory Answer is Jetter Answer is leterD (2 pts) Which one of the following is most likely to be a homogenesus mixture? a) campfire smoke b) blood filtered air d) soil plain yogurt Answer is letter 0 4) (2 pts.) Express the result of the following calculation in scieotifie notation and correct namber of significant figures: 0.0446 cm 13.1 em is. I 2.3 X o

Explanation / Answer

Q.1: Electrical conductivity, density, solubility and boiling point are physical properties, where as the reaction of potassium and calcium with water and their reactivity are chemical properties

Hence the option - (a) which states that potassium reacts with water more quickly than calcium react with water, is a comparison of chemical property. Hence (a) is the correct answer.

Q.2: According to the defination of theory, a theory is a well tested unifying principle that explains a body of facts.

Hence (c) is the correct answer.

Q.3: A homohenous mixture is a type of mixture in which the composition of each component is homogenous through out the volume of the mixture. A filtered air contains N2, O2, CO2 etc and doesn't contain immisible dust, particulate matter etc and hence forms a homogenous mixture.

Hence (c) is correct answer.

Q.4: While division of two different quantities, the product should contain significant figures equal to the number of significant figures present in the least significant quantity which is 3 here. Hence the product must contain 3 significant figures.

0.0446 cm2 / 15.1 cm = 0.00295 cm = 2.95x10-3 cm (answer)

Related Questions

Navigate

• Browse (All)
• Browse N
• Subjects

---

---

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