Share 8th grade Compound and Mixtures intro to light
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Which of the following best describes an element?
A substance that can be broken down easily
A pure substance made of atoms of the same kind
A compound with multiple properties
An XRF spectrometer is primarily used to:
Detect radioactivity
Measure temperature
Identify elements in rocks and soil
What happens when magnesium burns in oxygen?
It creates a new compound with different properties
The oxygen is destroyed
Nothing changes
A compound differs from an element because:
It is formed by chemically combining different elements
It cannot be seen
It exists only in laboratories
In the word equation "Iron + Sulfur → Iron sulfide", what are the reactants?
Oxygen
Iron sulfide
Iron and sulfur
An IR spectrometer helps scientists by:
Predicting weather patterns
Analyzing chemical bond vibrations
Measuring temperature
Which statement about elements is TRUE?
Elements always exist as liquids
Elements can be easily broken down
Elements are the simplest form of matter
When scientists use an XRF spectrometer on a rock, they are primarily trying to:
Determine its color
Measure its weight
Identify which elements are present
A chemical reaction involves:
No change in atomic structure
Complete destruction of matter
Rearrangement of atoms
Which of the following is a SOLID element at room temperature?
Iron
Oxygen
Hydrogen
The term "reactants" in a chemical equation refers to:
The starting materials
The laboratory equipment
The final products
What makes a compound different from its original elements?
It cannot be separated
It weighs less
It has new, unique properties
Scientists use IR spectrometers to:
Weigh substances
Measure sound waves
Detect chemical "signatures"
When iron and sulfur combine, they form:
A mixture
A gas
Iron sulfide
An element cannot be:
Seen under a microscope
Broken down by ordinary means
Heated
The process of elements combining chemically is called:
Mixing
Evaporation
Compound formation
