Select the correct statement concerning the formula c2h6o.

a. it is a molecular formula.

b. it is a formula unit.

c. it is the formula of an ionic compound.

d. it represents a molecule made of 1 carbon atom, 2 hydrogen atoms, and 6 oxygen atoms.

Of the reactions listed below, which one is NOT a combination reaction? A) C + O2 = > CO2 B) 2Mg + O2 = > 2MgO C) 2N2 + 3H = > 2NH3 D) CaO + H2O = > Ca (OH) 2 E) 2CH4 + 4O2 = > 2CO2 + 4H2O

Which of the following is an example of chemical weathering? A. Frost wedging B, Animal activity C. Plant growth D. Acid rain

What is the density of an object with a mass of 40.0 g and a volume of 80.0 cm3

What is the factored form of the expression? 4x2 - 81y2 A. (2x + 9) (2x - 9) B. (2x + 9y) (2x - 9y) C. (2x + 9y) 2 D. (2x - 9y) 2 Factor the polynomial. 54c3d4 + 9c4d2 A. 9c3d2 (d2 + 6c) B. 9c3d2 (6d2 + c. C. 9c4d2 (d2 + 6) D. 9c4d2 (6d2 + 1)

An experiment requires 40.0g of ethylene glycol, a liquid whose density is 1.114 g/mL. Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder. What volume of the liquid should he use?

What is this mass in pounds? (1lb=453.6g)

Which equation represents a neutralization reaction? 1. Na2CO3 + CaCl2 - > 2NaCl + CaCO3 2. NaCl + AgNO3 - > NaNO3 + AgCl 3. Ni (NO3) 2 + H2S - > NiS + 2HNO3 4. H2SO4 + Mg (OH) 2 - > MgSO4 + 2H2O

What does energy have to do with reproduction

Briefly explain one reason why Vygotsky's work is not as well-known as Piaget's

What is the oxidation number of neon