Chemistry
How many copper atoms and how many chlorine atoms are in a molecule of CuCl₂? A. one copper atom, one chlorine atom B. one copper atom, two chlorine atoms C. two copper atoms, one chlorine atom
A
Properties such as magnetism, luster, and malleability have been used to group together which category of elements on the periodic table? A. metals B. nonmetals C. metalloids D. noble gases
A
Which best describes a change that is physical? A. yarn being knitted into a sweater B. the engine from a tractor being started C. the metal on a bicycle being forming rust D. grass capturing the energy from sunlight
A
Which is an example of a chemical reaction? A. Vinegar added to baking soda forms a gas B. Water evaporates into air C. Sugar dissolves in water D. Corn kernels are crushed to form flour
A
Which property determines the chemical reactivity of an element? A. Atomic structure B. Solubility C. Density D. Volume
A
Which 𝘣𝘦𝘴𝘵 explains how atoms combine to form compounds? A. The atoms in the compound share electrons B. The atoms in the compound share neutrons C. The atoms in the compound share protons
A
A piece of paper burns, producing heat and light. Which 𝘣𝘦𝘴𝘵 describes the process of burning? A. Burning is a physical change. The paper mixes with the oxygen in the air, producing heat and light B. Burning is a chemical change. The paper reacts with the oxygen in the air, producing heat and light. C. Burning is a physical change. The paper changes from a solid to a gas, producing heat and light. D. Burning is a chemical change. The paper breaks down in sunlight, producing heat and light.
B
Which elements are the 𝘭𝘦𝘢𝘴𝘵 reactive on the periodic table? A. halogens B. noble gases C. alkali metals
B
Which 𝘣𝘦𝘴𝘵 demonstrates a physical change? A. Change in temperature B. Formation of a gas C. None of the above
B
Which 𝘣𝘦𝘴𝘵 describes how the current periodic table is arranged? A. by atomic mass B. by atomic number C. in alphabetical order by element symbol D. in numerical order by number of neutrons in the nucleus
B
Which 𝘣𝘦𝘴𝘵 explains how the atomic size of elements is arranged in the periodic table? A. The atomic size of the elements decreases from left to right and decreases from top to bottom. C. The atomic size of the elements increases from left to right and increases from top to bottom. D. The atomic size of the elements decreases from left to right and increases from top to bottom.
B
How are elements ordered in the modern periodic table? A. by date of discovery B. by decreasing atomic mass C. by increasing atomic number D. by alphabetical order of element symbols
C
How can the element carbon be classified? A. metal B. metalloid C. nonmetal
C
How does the zig-zag line on the periodic table help indicate properties of elements? A. elements located on the far left of the zig-zag line are liquids at room temperature B. elements located on the right of the zig-zag line are liquids at room temperature C. elements located on the left of the zig-zag line are good conductors of heat and electricity
C
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? A. 100 grams B. 104 grams C. 105 grams D. 110 grams
C
In which state of matter will the atoms of an element be tightly packed together? A. gas B. liquid C. solid
C
When water boils, water vapor is produced and escapes into the air. Which 𝘣𝘦𝘴𝘵 describes this change? A. melting B. freezing C. physical change D. chemical change
C
Which is the 𝘣𝘦𝘴𝘵 example of a heterogeneous mixture? A. sugar B. brass C. salad D. salt water
C
Which of these shows a physical change? A.Wood is burned in a fireplace B. Cake batter is baked in an oven C. A blue liquid and a yellow liquid mix and make a green liquid D. Baking soda is mixed with vinegar to make carbon dioxide gas
C
Which statement best describes the formation of rust? A. Rust results from a physical mixing of iron with water B. Rust results from a chemical breakdown of old metal C. Rust results from a chemical reaction between iron and water D. Rust results from a physical change when wind blows against metal
C
Which 𝘣𝘦𝘴𝘵 explains why scientists have arranged elements number 57 to 103 apart from the rest of the elements of the periodic table? A. They all have unique properties that set them apart B. They are all radioactive C. They are all synthetic
C
Which is true about the a compound? A. It is made up of one type of atom B. It can be formed through a physical reaction C. It can be changed into simpler substances through a physical change D. It is a pure substance containing elements that are chemically combined
D
