C371 Concepts of Science Exam
Questions and Answers 100% Solved
A substance has a low density and fills its container. What is the physical
state of the substance? - ✔✔gas
A substance has a definite volume and takes the shape of its container.
What is the physical state of the substance? - ✔✔liquid
A substance takes the shape of its container and flows easily. It is not
easily compressible. What is the physical state of the substance? -
✔✔liquid
Which of the following options best describes this illustration?
(Cube of spheres) - ✔✔solid
Which event represents a chemical change? - ✔✔A shovel rusts
Which property is a chemical property? - ✔✔Flammability
Which property is an extensive property of an iron bar? - ✔✔length
What does the law of conservation of matter specify? - ✔✔Total mass
stays the same in changes of state.
1
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
,According to the law of conservation of energy: - ✔✔Total energy in a
closed system is constant.
Exactly one pound of bread dough is placed in a baking tin. The dough is
cooked in an oven at 350ºF, releasing a wonderful aroma of freshly baked
bread during the cooking process. Which of the following options accurately
describes the mass of the baked loaf? - ✔✔The mass of the baked loaf is
less than the mass of the one pound of the original dough because a gas is
produced during the baking process. The gas escapes the dough and is
responsible for the aroma of freshly baked bread.
Which of the following options describes a change in potential energy only?
- ✔✔A leopard waits in a tree in order to more easily seek prey.
As a dropped ball falls to the ground, what is happening? - ✔✔It is
changing potential energy into kinetic energy.
Which situation is most directly associated with kinetic energy? - ✔✔A
bowling ball is rolled down a lane.
The metal bleachers at a football stadium heat up in the sun. Which of the
following options best describes the type of energy transfer occurring in this
situation? - ✔✔Thermal energy
How would you classify ammonia (NH3)? - ✔✔compound
2
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
, Which of the following is a pure substance? - ✔✔aluminum sulfate,
Al2(SO4)3
How would you classify a solution of potassium iodide, KI, in water? -
✔✔homogeneous mixture
A neutral atom has a mass number of 17 and 8 electrons. Which element is
it? - ✔✔Oxygen
An ion of which element could contain 33 protons, 42 neutrons, and 30
electrons? - ✔✔As3+
A neutral atom has a mass number of 1. Which element is it? -
✔✔Hydrogen
1/1
What is the mass number for an atom of selenium that has 45 neutrons? -
✔✔79
What is the charge of an ion that contains 15 protons and 18 electrons? -
✔✔3-
235 (mass #) U (element) 92 (Atomic #) How many electrons are in this
isotope? - ✔✔92
1 (Proton)/1 H, 2(Proton + 1 Neutron)/1 H, 2(Proton + 2 Neutron)/1 H
3
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
Questions and Answers 100% Solved
A substance has a low density and fills its container. What is the physical
state of the substance? - ✔✔gas
A substance has a definite volume and takes the shape of its container.
What is the physical state of the substance? - ✔✔liquid
A substance takes the shape of its container and flows easily. It is not
easily compressible. What is the physical state of the substance? -
✔✔liquid
Which of the following options best describes this illustration?
(Cube of spheres) - ✔✔solid
Which event represents a chemical change? - ✔✔A shovel rusts
Which property is a chemical property? - ✔✔Flammability
Which property is an extensive property of an iron bar? - ✔✔length
What does the law of conservation of matter specify? - ✔✔Total mass
stays the same in changes of state.
1
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
,According to the law of conservation of energy: - ✔✔Total energy in a
closed system is constant.
Exactly one pound of bread dough is placed in a baking tin. The dough is
cooked in an oven at 350ºF, releasing a wonderful aroma of freshly baked
bread during the cooking process. Which of the following options accurately
describes the mass of the baked loaf? - ✔✔The mass of the baked loaf is
less than the mass of the one pound of the original dough because a gas is
produced during the baking process. The gas escapes the dough and is
responsible for the aroma of freshly baked bread.
Which of the following options describes a change in potential energy only?
- ✔✔A leopard waits in a tree in order to more easily seek prey.
As a dropped ball falls to the ground, what is happening? - ✔✔It is
changing potential energy into kinetic energy.
Which situation is most directly associated with kinetic energy? - ✔✔A
bowling ball is rolled down a lane.
The metal bleachers at a football stadium heat up in the sun. Which of the
following options best describes the type of energy transfer occurring in this
situation? - ✔✔Thermal energy
How would you classify ammonia (NH3)? - ✔✔compound
2
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
, Which of the following is a pure substance? - ✔✔aluminum sulfate,
Al2(SO4)3
How would you classify a solution of potassium iodide, KI, in water? -
✔✔homogeneous mixture
A neutral atom has a mass number of 17 and 8 electrons. Which element is
it? - ✔✔Oxygen
An ion of which element could contain 33 protons, 42 neutrons, and 30
electrons? - ✔✔As3+
A neutral atom has a mass number of 1. Which element is it? -
✔✔Hydrogen
1/1
What is the mass number for an atom of selenium that has 45 neutrons? -
✔✔79
What is the charge of an ion that contains 15 protons and 18 electrons? -
✔✔3-
235 (mass #) U (element) 92 (Atomic #) How many electrons are in this
isotope? - ✔✔92
1 (Proton)/1 H, 2(Proton + 1 Neutron)/1 H, 2(Proton + 2 Neutron)/1 H
3
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
