Chemistry Test Unit 1

If 100 grams of vinegar and 5 grams of baking soda are poured in a container, a small amount of gas will be produced. What will the final mass of the products be if the gas is trapped in the container?

105 grams

How many atoms are in one formula unit of the compound FeC5O5?

11 atoms

Which set of coefficients will balance this chemical equation? __PbS(s) + __O2(g) → 2PbO(s) + 2SO2(g)

2, 3

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?

6 atoms of carbon (C)

A scientist placed a sample of lithium into a container of water. The scientist observed the lithium floating and making a buzzing sound as gas bubbles were forming around it. Which conclusion is BEST supported by this observation?

A chemical change took place.

Which particle type can be identified as being from a specific element?

Atom

A science class is studying the states of matter. One group of students freezes 100 grams (g) of water in a cup. Another group of students melts 50 g of ice in a cup. Which of these will MOST likely occur at the end of the experiment?

Both groups will have the same mass with which they started.

Which is the BEST explanation of why heat is released when wood burns?

Burning releases energy stored in chemical bonds.

What is the product of the reaction?

Compound

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

During a chemical reaction, the total amount of matter stays the same.

Which statement BEST describes the organization of the periodic table of the elements?

Elements within a group have similar properties.

A teacher asks her students to examine titles of four scientific articles. Which titled article is specifically about a chemical change?

How Baking Soda Reacts With Vinegar

In 1804, the Italian geologist G. Thompson, who was studying an iron-nickel meteorite, attempted to clean the dull patina from it by using a nitric acid wash. Strange figures like the ones in the photo below soon emerged on the surface. These patterns are now known as Widmanstätten patterns. These patterns are the result of an extraordinarily slow cooling (millions of years) of the metal meteorite. What do these patterns reveal about the material making up the iron-nickel meteorite?

It is a crystalline solid.

Which statement BEST describes the formation of rust?

Rust results from a chemical reaction between iron and water.

Sodium sulfate and barium chloride react with each other to form sodium chloride and barium sulfate as shown. Which statement MOST accurately describes the mass of the reactants compared to the mass of the products?

The mass of the reactants is the same as the mass of the products

Which process is MOST effective for separating sodium chloride from a saltwater solution?

filtration

What physical property is characteristic of all of the elements in the group located in the rightmost column of the periodic table?

gas state at room temperature

Elements in the same column of the periodic table of the elements all

have similar physical characteristics

Which statement best explains how periods on the periodic table are organized?

increasing atomic number from left to right

Which characteristic of an element determines its placement in the periodic table?

number of protons