CRT Science Exam Questions & Answers 2024/2025
What is the smallest unit of an element that still has
the properties of that element? - ANSWERSAn atom
Pure water is neutral and has a pH of 7. When lemon
juice is added to water the pH will become lower than
7 and turns litmus paper red. L...
What is the smallest unit of an element that still has
the properties of that element? - ANSWERSAn atom
Pure water is neutral and has a pH of 7. When lemon
juice is added to water the pH will become lower than
7 and turns litmus paper red. Lemon juice is - ANSWERSan acid.
A student has two unknown substances that must be
classified into states of matter. Which properties
would be used? - ANSWERS. Shape and volume
. Which of the following describes the differences
between solids and liquids? - ANSWERSSolids have a definite volume and shape, but
liquids only have a definite volume.
5. According to the Law of Conservation of Mass, the
number of iron atoms needed to complete the
following reaction is
___Fe + 3O2 2Fe2O - ANSWERS4
Use a periodic table to answer the following question.
Which group of elements would be expected to have
similar properties? - ANSWERSOxygen, sulfur, selenium
, . How many electrons are in a neutral atom with an
atomic number of 12? - ANSWERS12
The mass number of an element is the total number
of protons and neutrons located in the nucleus. If
carbon has an atomic number of 6 and a mass
number of 12, how many neutrons does it contain? - ANSWERS6
. When salt dissolves in water, the water is the - ANSWERS. solvent.
Which of the following is a chemical property of
matter? - ANSWERSFlammability
Which of the following pairs of compounds contain
the same number of atoms, but different kinds of
atoms? - ANSWERS. CO2 and CaCl2.
When sulfuric acid, H2SO4, is broken down into
separate elements, how many different atoms result? - ANSWERSThree
An oxygen atom has 8 protons, 8 neutrons and 8
electrons. If the oxygen atom gains two electrons to
form an oxygen ion, what will be the magnitude and
sign of the charge? - ANSWERS-2
Atoms of an element contain only one type of atom
because they each contain the same number of - ANSWERSprotons.
A student is given a sample of an unknown liquid to
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