The _______ properties of matter can be _______ or _______ without changing (39) the composition of the matter. We can describe the _______ and _______ by (40) looking and feeling the sample, we can detect an _______ by smelling, and we (41) can use a thermometer to measure the _______ and _______ points.
The physical properties of matter can be observed or measured without changing the composition of the matter. We can describe the appearance and texture by looking and feeling the sample, we can detect an odor by smelling, and we can use a thermometer to measure the melting and boiling points.
The _______ properties of matter are determined by the matter’s ability to (43) combine with or change into one or more different _______. The _______ of a (44) substance is how likely it is to react or have a chemical change. If the matter will (45) catch fire easily then it is considered _______. Another chemical trait is if the (46) chemical is poisonous, or its _______.
The chemical properties of matter are determined by the matter's ability to combine with or change into one or more different substances. The reactivity of a substance is how likely it is to react or undergo a chemical change. If the matter will catch fire easily, then it is considered flammable. Another chemical trait is if the chemical is poisonous or its toxicity.
A physical change is a change of the state of _______ or form, but it remains the (48) _______ substance. Ice, _______, and steam are all H2O even though one is a (49) _______, one a liquid, and one a _______.
A physical change is a change of the state of matter or form, but it remains the same substance. Ice, water, and steam are all H2O, even though one is a solid, one a liquid, and one a gas.
A chemical change cannot be undone, it is _______. During a chemical change it (51) becomes a _______ substance. Forms of evidence of a chemical change include (52) a release of _______, _______ absorbed or generated (substances gets colder or (53) hotter), or a change of_______.
A chemical change cannot be undone, it is irreversible. During a chemical change, it becomes a new substance. Forms of evidence of a chemical change include a release of energy, heat absorbed or generated (substances get colder or hotter), or a change of color.
The atomic number is the number of
(55) ______ (positively charged particles)
(56) in the ______. It is unique for each
(57) element.
(58) The ______ mass number of the element
(59) ______the number of ______and ______
(60) (neutral, no charge) in the nucleus.
The atomic number is the number of protons (positively charged particles) in the nucleus. It is unique for each element.
The mass number of the element includes the number of protons and neutrons (neutral, no charge) in the nucleus.
The ______ mass number of the element
(59) _protons_____the number of _nutrons_____and ______
(60) (neutral, no charge) in the nucleus.