Which of the following is a quantitative observation? F. The object has a mass of 2.3 grams.
G. The liquid is yellow.
H. Carbon dioxide gas is produced.
J. A yellow solid is formed.
3. A hypothesis is:
A. a summary of observed (measurable) behavior.
B. a process used to make and explain discoveries and to solve problems.
C. a possible explanation for why nature behaves in a particular way.
D. an explanation that has stood up to much testing and investigation.
4. A student observes that a tree is made up of a trunk, branches, and leaves. What type of
observation is this?
F. Quantitative
G. Microscopic
H. Chemical
J. Macroscopic
5. A student uses the following structured process to investigate a scientific phenomenon:
statement of problem, data collection, hypothesis, and experimentation. Which of the
following terms best describes this process?
A. Chemistry
B. Macroscopic
C. Scientific method
D. Predictive inquiry

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat

Astudent made a graph plotting the progress of a reaction over time. the student forgot to label the y-axis of the graph. a graph is shown with two graph lines. one graph line starts at a higher position on the y axis and slopes downwards towards the right. the other graph line starts at a lower position on the y axis and slopes upwards towards the right. the two graph lines stop short of intersecting each other and continue as separate lines which gradually become straight and parallel to the x axis. a vertical line is shown at a point where the two graph lines finally became parallel to the x axis. this vertical line is labeled equilibrium. the title on the x axis is time and an arrow pointing towards the right is shown above time. the title on the y axis is left blank. what best explains the label that the student should use on the y-axis? amount, because as the amount of product decreases, the amount of reactant increases over time. reaction rate, because forward and backward reaction become equal at equilibrium. amount, because the amounts of reactants and products become constant after equilibrium is reached. reaction rate, as the rate of forward reaction increases and rate of backward reaction decreases over time.

Draw metallic bonding if two copper