Chemestry Mid-Term
A 10 gram sample of iron reacts with oxygen to form 18.2 grams of ferric oxide. How many grams of oxygen reacted?
8.2g
What is the volume of a common penny if its diameter is 1.90 cm and its height is 0.10 cm?
0.28 mL
Which of the following BEST describes the composition of the chemical compound, (NH₄)₃PO₄?
3 nitrogen atoms, 12 hydrogen atoms, 1 phosphorus atom, 4 oxygen atoms
When we use tools to find the volume and mass of matter we are
estimating or approximating
NaBr is completely dissolved in water. Which of the following statements BEST describes this situation?
solution
The bigger something is, the greater it's mass
sometimes true
Which of the following is NOT a state of matter a. Gas b. Liquid b. Solid d. Space
space
Which of the following is NOT an extensive property?
Stickiness
Which of the following cannot be separated into pure substances by physical changes?
Sugar
Adding heat to a liquid at room temperature may cause the liquid to become
Vapor
The amount of space matter takes up...?
Volume
The function of the neutron is to
act as nuclear glue to hold protons together
What causes matter to change state?
adding or removing heat
A subatomic particle with a no electric charge
neutron
We learned that we can change matter. Changes in matter where no new kinds of matter are formed are called:
physical changes
Which of the following is a homogeneous mixture? a. CuCl₂ (aq) b. peanut brittle c. CuCl₂ (s) d. suspension
CuCl₂ (aq)
Which of the following statements about the diagram is CORRECT? hydrogen + chlorine → hydrogen chloride H₂(g) + CL₂(g) → 2HCL(g) H-H + Cl-Cl → H-Cl+ H-Cl ↑ ↑ ↑ ↑ Bonds break New Bonds form
At some point atoms were rearranged
An object is completely submerged beneath an unknown liquid in a graduated cylinder. The volume of the liquid and cylinder combined was measured to be 10.23 mL. When the object was removed from the graduated cylinder, the volume of liquid read, "0.47 mL." What is the volume of the removed object?
9.76 mL
In the lab "Separation of a Mixture," the removal of the salt (CaCO₃), was accomplished by:
A physical change that took advantage of particle size after the reaction took place
Air does not have mass
Always false
All matter is made up of particles or...?
Atoms
What physical properties can you observe with your sense of sight?
Color and size
Substances that cannot be broken down into other substances by ordinary chemical changes are classified as:
Elements
Which of the following statements regarding the diagram are correct? The diagram is a reaction coordinate diagram where the Energy increases then deacreases
Energy is released by the system in order for bonds to break
When you add heat to a liquid a gas may form. The process by which a liquid becomes a gas is called...?
Evaporation
Which of the following statements is correct?
Gasoline and water can be physically separated using distillation since their boiling points are different
80 grams of water was found to have a volume of 80.2 cm³. A sample of gasoline was found to have a mass of 99 grams and a volume of 146-mL. Which statement below is CORRECT?
Gasoline will float above the water
Which tool helps us to precisely measure the volume of a liquid?
Graduated cylinder
We are able to pour which state of matter that fills the inside of a container
Liquid
Objects of the same size and shape may have different
Mass
There are two jars that are the same size. One is filled with peanut butter, and the other is filled with jelly. They have the same volume, but they may not have the same _______.
Mass
Which one of the following observations would not be evidence for a chemical reaction?
Melting of a solid
Which of the following processes involves only a physical change?
Mixing a salt solution with water so that it becomes diluted
Sarah added warm milk to her cocoa powder. Sarah made a
Mixture
Adding heat to matter causes the atoms to _________. This may cause the connections to become looser and the matter to change its state
Move faster
The list bellow represents some common processes I. Boiling of an egg II. Rusting of iron III. Distilling sea water IV. Adding water to a solution of copper (II) sulfate V. Melting sulfur Which one of the following statements (ABOVE) is correct?
Only II and IV are chemical changes
Anything you can observe about without changing its chemical make-up
Physical property
Making a paper airplane is an example of how the paper can be
Physically changed
Which one of the following is not a pure substance?
Sodium chloride solution
A _________ is matter with a definite shape
Solid
Particles of which type of matter move very little because they are tightly connected?
Solid
the volume and shape of this type of matter do not change when placed into a container
Solid
Which BEST describes E↓a
The energy required to break chemical bonds
Which of the following lists are comprised of ONLY chemical change?
bonds broken, atoms rearrange, bonds form, heat released
Which group of words names the three states of matter?
gas, liquid, solid
The amount of Matter in an object is called its'...?
mass