Phenol red acts as a(n) __________ that changes __________ when a chemical change occurs.

When a reaction gives off light, forms a solid, or changes temperature, these are signs that a _______________ change has occurred because a new _______________ is produced.

Male crickets make a chirping sound by rubbing the edges of their forewings together to call for female mates in a process called stridulation. The number of chirps that crickets produce during a period of time is called the frequency of chirps. Scientists counted, record,ed and analyzed the frequency of chirps that a male cricket produced in different temperatures and humidity. Temperature is the measure of hotness or coldness, while humidity is the measure of the concentration of water vapor present in the air.

In the cricket chirping experiment, the dependent variable is the __________ of chirps.

Male crickets make a chirping sound by rubbing the edges of their forewings together to call for female mates in a process called stridulation. The number of chirps that crickets produce during a period of time is called the frequency of chirps. Scientists counted, record,ed and analyzed the frequency of chirps that a male cricket produced in different temperatures and humidity. Temperature is the measure of hotness or coldness, while humidity is the measure of the concentration of water vapor present in the air.

In the cricket chirping experiment, the independent variable is the __________ of chirps.

Accuracy refers to how close a measurement is to the __________ value.

Precision refers to how close measurements are to __________.

A gas is represented by particle diagrams where particles are:

A particle diagram showing atoms tightly packed but able to slide past each other represents the __________ state of matter.

A homogeneous mixture has a composition that is:

A heterogeneous mixture has a composition that is __________ throughout because the particles are __________ mixed.

A pure substance is represented by diagrams in which all particles are:

A diagram containing only O₂ molecules represents a:

A solid metal such as copper would be represented by particles arranged in a(n) __________ pattern and packed __________.

Plasma is a state of matter containing particles that are __________ and have lost __________.

Flammability is a __________ property because the substance’s identity (does / does not) change during the test.

When a solid cracks or dents when struck, this demonstrates a __________ property.

A chemical reaction has occurred if a new __________ forms or if __________ is produced.

Dissolving a powder in water is a __________ change.

A temperature change during dissolving would indicate a _______________ change.

Heating a solid so particles spread apart but the substance remains the same is a _________________ change.

Hammering aluminum foil into a thin sheet is a ________________ change because the atoms are ________________.

Which observation does NOT indicate a chemical reaction?

Evaporation is shown in a particle diagram when particles become more _____________ without forming new ___________________.

A mixture of gases such as H₂O, O₂, and CO₂ is best described as a mixture of __________.

The half-life graph shows 10 g remaining at about _____ days.

If the starting mass was 100 g, after one half-life (____ days) it would be _____ g.

A nuclear reaction where a large nucleus splits into smaller nuclei is called __________.

The most common reaction used in nuclear power plants is __________.

An isotope of carbon with mass number 14 contains __________ protons and __________ neutrons.

When an atom gains two electrons, it becomes a(n) __________ ion with a charge of __________.

An atom with 19 protons and mass number 39 has how many neutrons?

When uranium-238 emits an alpha particle, the new element’s atomic number becomes:

The atomic mass number of an atom with 26 protons and 28 neutrons is:

Elements in Group A (alkali metals) typically form ions with a charge of __________.

Elements in Group B (alkaline earth metals) have _____ valence electrons.

Elements in Group C (halogens) have _____ valence electrons.

An S²⁻ ion has the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶. How many electrons total?

A nonmetal among the choices is:

The electron configuration 1s² 2s² 2p⁶ 3s² corresponds to the element:

As you go down a group, ionization energy decreases because atomic size __________.

Atomic size increases down a group due to increased __________.

As you move left to right across a period, atomic size decreases because the number of __________ increases, pulling electrons __________ to the nucleus.

Which of the following is a chemical property of a substance?

What happens to the number of neutrons in an atom if its mass number increases but the atomic number stays the same?

Which state of matter has particles that are far apart and move rapidly in all directions?

Which of the following best describes a heterogeneous mixture?

What happens to the atomic number when an atom emits a beta particle?

Which property is considered chemical rather than physical?

Identify the type of nuclear decay shown here

²¹⁴₈₃Bi → ⁰_-1e + ²¹⁴₈₄Po

Solve this equation.

₈₅²⁰⁹At = ___ + ₂⁴He

Solve this equation for.

₆¹⁴C = ___ + _-1⁰e

What is the name of group number 2?

Which element is found in group 2, period 6?

Which halogen is found in period 4?

Elements that have the same number of energy levels are said to be in the same ______.

______________ refers to the way a metal can be hammered or rolled into thin sheets.

Identify the pure substances below.

The smallest particle of an element that still has the properties of that element is the

A(n) ____________________________ mixture has the same composition throughout

______________________________ is a technique used to separate out homogenous mixtures where there is one or more dissolved solids.

When separating a mixture of iron filings, sand, and sulfur, what tool was use to remove the iron filings?

Mixtures can be separated by ________________ processes.

Which of the following represents a compound?

Which diagram represents an element?

What type of matter is shown in this particle diagram?

What type of matter is shown in this particle diagram?

Which of the following formulas represents a compound?

Which of these is a good scientific question?

Which of these is a good scientific question?

How does the angle of a cannon affect the distance a cannonball travels? What would be the independent variable?

How does the angle of a cannon affect the distance a cannonball travels? What would be some controlled variables?