Review for Unit 3 Summative Assessment

Review for Unit 3 Summative Assessment

What should you know? Unit 3a:

• Types of matter (atom, element, mixtures, compound)

• Homogeneous vs. heterogeneous mixtures and techniques of separation

• States of matter: solid, liquid, gas

• Physical and chemical changes and properties

• Indicators of chemical reaction

• Parts of a chemical equation

• Express elements and compounds with symbols and formulas, respectively

Multiple Choice

Name the part in red:

H₂ + O₂ -> H₂O

• Coefficient

• Product

• Yield

• Subscript

Multiple Choice

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂ --> 2Al₂ O₃

• 2

• 6

• 1

• 4

Multiple Choice

Which side of a chemical equation is the product side?

• Left (before the yields sign)

• Right (after the yields sign)

Multiple Choice

In the chemical equation H₂O₂(ag) → H₂O(l) + O₂(g), the O₂ is a

• reactant

• yield

• product

• solid

Multiple Choice

Chemical reactions

• create and destoy atoms

• only occurs outside living organisms

• occurs only in living organisms

• produce new substances

Multiple Choice

The products of a reaction have the same ________as the reactants.

• molecule

• atoms

• subscripts

• coefficients

Multiple Choice

Which scientific observation, shown in the chart, indicates that a chemical reaction has NOT occurred?

• Number 1

• Number 2

• Number 3

• Number 4

Multiple Choice

A scientist spilled a few drops of dilute hydrochloric acid (HCl) on a lab table. For safety purposes, the scientist sprinkled some baking soda ( $NaHCO_3$  ) onto the spill. Which observation would provide the best evidence that a chemical reaction occured?

• The baking soda and hydrochloric acid combined, and bubbles formed. 

• The baking soda absorbed the hydrochloric acid. 

• Some of the baking soda dissolved in the hydochloric acid.

• The hydrochloric acid evaporated, leaving only the baking soda. 

Multiple Select

Which lab experiments below describe a situation where a chemical change has occurred? Check all that apply.

• After adding zinc (Zn) to hydrochloric acid (HCl), a student observes bubbles forming in the solution and a thermometer registers a  $10\degree$  change in temperature.

• A student uses a mortar and pestle (a grinding stone) to break up large pieces of ammonium thiocyanate ( $NH_4SCN$  ) into smaller pieces.

• After combining Unknown A (a solid, white crystal) with Unknown B (a clear, odorless liquid), there is a strong smell produced and a thermometer registers a  $15\degree$  change in temperature.

• A student dissolves sugar ( $C_6H_6O_6$  ) into water ( $H_2O$  ). The sugar crystals seem to disappear.

Multiple Choice

Pb is the element symbol for....

• lead

• gold

• peanutbutter

• nitrogen

Multiple Choice

What's the symbol for copper?

• C

• Co

• Cu

• CP

Multiple Choice

What is the process of separating products with densities?

• centrifugation

• chromatography

• heating

• decantation

Multiple Choice

To separate a mixture of soil and water what separation method is used?

• Filtration

• Distillation

• Chromatography

• Evaporation

Multiple Choice

Water and alcohol are easily separated by distillation because of their

• different melting points

• different colors

• different densities

• different boiling points

Multiple Choice

Which one of the following would you use to separate sand from iron filings?

• a bar magnet

• filter paper

• chromatography paper

• alum

Multiple Choice

Dyes in water soluble markers may be separated by means of..

• crystallization

• sublimation

• chromatography

• sedimentation

Multiple Select

Which of the following is the correct set-up of filtration?

Multiple Choice

Which state of matter has molecules that move fastest and spread to fill the space they are in? They do not form any pattern.

• solid

• liquid

• gas

Multiple Choice

If you had two different substances that looked exactly the same, which properties would you use to tell them apart?

• Sound

• Size

• Color

• Density

Multiple Select

Choose the 3 that are physical properties of aluminum foil

• Malleable

• Luster

• Oxidation

• High melting point

Multiple Choice

Electrical conductivity is an example of what kind of property?

• Chemical

• Large

• Physical

• Boiling

Multiple Choice

Choose the one that is a chemical property

• Magnetism

• Size

• Color

• Reactivity with water

Multiple Choice

Choose which one is a physical property

• Flammability

• Solubility

• Water Reaction

• Magic

Multiple Select

Mark all examples of a chemical change occurring

• liquid water evaporates

• a 12V current passes through water, breaking is down from

  $H_2O\ \left(l\right)$ into $H_2\ \left(g\right)$ and $O_2\ \left(g\right)$ (electrolysis)

• Iron rusts

• Coffee cools down to a drinkable temperature

Multiple Choice

When ice melts to water at 0 degrees C, that is an example of what type of change?

• chemical

• physical

• intensive

• property

Multiple Choice

I give one student 1 gallon of coffee and a second student 1,000 gallons of coffee and ask them to find the density of coffee. Will the students have the same answer?

• yes because density is an intensive property

• yes because density is an extensive property

• no because density is an extensive property

• no because density is an intensive property

What should you know? Unit 3b:

• Explain the contributions of 4 major scientists/philosopher: Democritus, Dalton, Thomson, Rutherford

• Define the points of Dalton's atomic theory and know which points were modified

• Be able to identify the evolution of the atomic model (Dalton's, Thomson's, Rutherford's)

• Be able to identify subatomic particles, their role in the atom, location, charge, mass contribution to the atom

• Identify and interpret mass and atomic numbers

• Define what an isotope is and some of their uses as radioisotopes

• Calculate the average atomic mass and distinguish it from mass number

Multiple Choice

On the periodic table, how is atomic mass represented?

• weighted average of all the element's isotopes based on their natural abundance.

• as the exact mass of every atom

• as the mass of the most common isotopes

• As the masses of all protons added together

Multiple Choice

An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?

• 9.012, Beryllium

• 12.011, Carbon

• 6.941, Lithium

• 10.812, Boron

Multiple Choice

If a sulfur atom has 16 protons, 16 electrons, and 16 neutrons, its mass number is:

• 16

• 32

• 48

• 64

Multiple Choice

Isotopes are atoms of the same element that have the same number of __________ but different number of __________ . Therefore, isotopes of the same element have different masses.

• protons, neutrons

• protons, electrons

• neutrons, protons

• electrons, protons

Multiple Choice

How many protons would be present in this atom?

• 35.453

• 17

• 18

• 35

Multiple Choice

Using this element, how many electrons would be present?

• 108

• 47

• 61

• 107.87

Multiple Choice

Where is most of the mass in an atom?

• electron cloud

• nucleus

• it's equally distributed among the whole atom

• there is no mass in an atom

Multiple Choice

Which number identifies the number of protons?

• 12

• 24.305

• 24

• 24-12

Multiple Choice

How many neutrons does a Calcium-48 isotope have?

• 16

• 20

• 28

• 12

Multiple Choice

How many neutrons in C-14?

• 6

• 7

• 14

• 8

Multiple Choice

How many neutrons does this isotope of lithium have?

• 8

• 3

• 4

• 5

Multiple Choice

What do these isotopes of carbon all have in common?

• same number of neutrons & same mass number

• same atomic number and same number of neutrons

• same atomic number and same number of electrons

• same number of protons, same atomic number, and same mass number

Multiple Choice

When you add the number of protons and neutrons together, you are calculating...

• Atomic Number

• Atomic Mass

• Mass Number

• Pythagorean's Theorem

Multiple Choice

How did Rutherford describe the nucleus?

• Tiny

• Dense

• Positively Charged

• all of the above

Multiple Choice

What two particles are part of the nucleus of an atom?

• Protons and Electrons

• Electrons and Neutrons

• Protons and Neutrons

• Alpha and Beta

Multiple Choice

What was the name of the model?

• Oatmeal Model

• Rutherford Model

• Bohr Model

• Plum Pudding Model

Multiple Choice

Which of the following are parts of Dalton's theory?

• All substances are made of atoms.

• Atoms join with other atoms to make new substances.

• Atoms of different elements are different

• All of these are part of his theory

Multiple Choice

Whose model is this?

• Millikan

• Rutherford

• Thomson

• Bohr

Multiple Choice

How did Thomson build upon Dalton's model?

• His model was the same.

• He put electrons in orbitals.

• He discovered the nucleus.

• He discovered subatomic particles (electron).

Multiple Choice

The first person to propose a theory about an atom called the Atomos Theory was

• Democritus

• Rutherford

• Dalton

• Aristotle

Multiple Choice

Rutherford's gold foil experiment provided evidence that...

• negative and positive charges are spread evenly throughout the atom.

• alpha particles have a positive charge.

• gold is not a dense as previously thought.

• there is a dense positively charged nucleus at the center of an atom.

Multiple Choice

What contribution did John Dalton make to atomic theory?

• He discovered that every atom was positively charged.

• He discovered that every element consisted of one type of atom that couldn't be divided.

• He discovered that atoms had nuclei.

• He discovered that atoms could be divided into smaller parts.