Chemistry Review

Chemistry Review

Multiple Choice

Water is an example of:

• Element
• Compound
• Solution

Compound

Water is made up of Hydrogen and Oxygen

Multiple Choice

Which statement best describes an element?

• made from mixture

• thousands in the world

• pure, made of only one atom

• can be separated

pure, made of only one atom

Elements can be found on the periodic tabel

Multiple Choice

Carbon (C) is found on the Periodic Table; however, Carbon Dioxide (CO₂) is not. Why is this the case?

• Only substances that cannot be broken down into simpler substances are found on the Periodic Table

• Only gases are found on the Periodic Table.

• Only compounds are found on the Periodic Table.

• Compounds cannot be broken down into simpler substances.

Multiple Choice

Which model best represents a chemical compound?

Multiple Choice

Janet slices a stick of butter in half, then leaves it on the counter to melt.  These are –

• a physical, then chemical change

• both physical changes

• a chemical, then physical change

• both chemical changes

Multiple Choice

Which is NOT an indication of a chemical change?

• temperature change
• formation of a precipitate
• shape change
• color change

shape change

Tearing paper, changes it shape, but it is still paper

Multiple Choice

The pictures above show a blue liquid being added to a clear liquid.  Which is the best evidence that a chemical reaction may have occurred?

• The solution turned light blue

• The temperature remained the same

• There were solid particles formed

• The volume increased

Multiple Choice

After reviewing these hypotheses below, which one is best supported by the data above?

• If the mixture fizzes with vinegar, then it is cornstarch.

• If the mixture turns blue with iodine, then it contains sugar. 

• If the mixture melts when heated, then it is sugar.

• If the mixture melts when heated, then it is a mystery mixture.

Multiple Choice

Which of the following describes a precipitate?

• a liquid forms when a block of metal is heated
• a solid forms when one liquid is poured into another
• a gas forms when a solid is placed in a liquid
• bubbles form when an acid is poured on a rock

a solid forms when one liquid is poured into another

Multiple Choice

One of the signs of a chemical reaction taking place is:

• A decrease in temperature
• Substances are mixed
• Substance is dissolving
• Color is not changing

A decrease in temperature

Multiple Choice

The elements sodium (Na) and chlorine (Cl) are deadly and poisonous. When they are combined, a precipitate forms, making edible table salt (NaCl). Which of the following is the best explanation for what just happened?

• All elements are poisonous in their pure forms.

• A chemical change occurred.

• A physical change occurred

• Sodium and chlorine are dangerous only if inhaled.

Multiple Choice

I am a good conductor of electricity and am malleable.

• Metal

• Metalloid

• Non Metal

Metal

Multiple Choice

I am a bad conductor of electricity and heat.

• Metal

• Metalloid

• Non Metal

Non Metal

Multiple Choice

I am malleable, but do not have a shiny luster.

• Metal

• Metalloid

• Non Metal

Metalloid

Metalloids have properties of both metals and nonmetals