Winter Exam Review (I)

Classifying Mass + Phys/Chem Properties

100

Is temperature a physical or chemical property?

Physical

200

Is hydrochloric acid (HCl solution) a heterogeneous mixture, homogeneous mixture, compound, or element?

Homogeneous mixture

300

What is true of the properties of a homogeneous mixture as compared to the properties of its components?

The properties of a homogeneous mixture are similar to those of its components. 

400

Which of the following is NOT a physical change?

-Ice melting
-Glass shattering
-Wood Rotting
-Salt dissolving in water

Wood rotting

500

Is density an extensive or intensive property?

Intensive -- it does not depend on amount 

600

An unknown sample of matter is made up of nitrogen and oxygen. It is a dark orange-brown gas with an acrid smell. Is it a heterogeneous mixture, a homogeneous mixture, a compound, or an element? 

A compound

Measurement + Mole Conversions

100

How many significant figures are in the measurement 6.98*10^-3 m? 

3

200

A solution salt has a concentration of X mol/L. If there are Y mL of solution, give the moles of salt in terms of X and Y. 

YmL* (1L)/(1000mL) * X (mol)/L 

300

What is the molar mass of PbCl₂?

278.1 g/mol 

400

Explain why the conversion factor 1000m/km has infinite significant figures, not just one. 

It is a definition, not a measurement, so there is no uncertainty

500

Determine the number of significant figures the final answer should have in the equation below:

321g * 4.184 J/(g°C) * (68.9°C-61.2°C)

2 significant figures 

600

Write the correct set up for calculating the mass of 1.35*10²⁰ molecules of nitrogen gas. 

1.35*10^20 mol\e\cu\l\es*(mol)/(6.022*10^23mol\e\cu\l\es)*28.013g/(mol)

Atoms and the Periodic Table

100

What is the charge of barium ion?

+2

200

What is the name of the family of elements containing lithium, sodium, and potassium?

Alkali Metals

300

Give the ground state electron configuration of neutral fluorine atom. 

1s²2s²2p⁵

400

Explain the trend in electronegativities going L->R across a period and from top->bottom down a family 

L->R across period: electronegativity increases (excluding noble gases)

top->bottom down family: electronegativity decreases

500

What neutral atom is sulfide ion isoelectronic to?

Argon

600

Which has the higher first ionization energy: Cesium (Z=55), Cobalt (Z=27) or Oxygen (Z=8)

Oxygen 

Chemical Compounds

100

A compound made up of a metal and a nonmetal is a what type of compound?

Ionic

200

Give the chemical formula of dinitrogen tetroxide

N₂O₄

300

The name of the compound with chemical formula Fe₂(CO₃)₃ is

Iron(III) carbonate

400

Which of the following compounds contains only nonpolar bonds:
NaCl
O₂
H₂O
CF₄

O₂

500

What is the molecular geometry of ammonia?

Trigonal pyramidal

600

Which of the following molecules is polar?
CF₄
N₂
BCl₃
CH₂F₂

CH₂F₂

Chemical Reactions

100

Which law explains why chemical reactions must be balanced?

The Law of Conservation of Matter

200

What type of reaction is the following:

2Na(s) + 2H₂O(l) --> 2NaOH(aq) + H₂(g) 

Single replacement

300

What must be true of at least one of the products of a double replacement reaction in order for the reaction to occur?

At least one of the products must be a solid, liquid, or gas

400

Predict the products for the following reaction:

C₄H₁₀(l)+O₂(g)--> 

CO₂(g) + H₂O(l) 

500

Which of the following single replacement reactions will NOT occur:

Mg(s) + AgNO₃(aq)-->
Cu(s) + AgNO₃(aq)-->
Au(s) + AgNO₃(aq)-->
Fe(s) + AgNO₃(aq)-->

Au(s) + AgNO₃(aq)--> NR

600

Predict the products of the reaction and ID the reaction type: (must get BOTH correct to get points)

Ca(HCO₃)₂(s) --> 

CaO(s) + H₂O(l) + CO₂(g)