Share 8th grade Compound and Mixtures intro to light
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Which of the following best describes an element?
A pure substance made of atoms of the same kind
A substance that can be broken down easily
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 cannot be seen
It exists only in laboratories
It is formed by chemically combining different elements
In the word equation "Iron + Sulfur → Iron sulfide", what are the reactants?
Oxygen
Iron sulfide
Iron and sulfur
An IR spectrometer helps scientists by:
Measuring temperature
Analyzing chemical bond vibrations
Predicting weather patterns
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:
Measure its weight
Identify which elements are present
Determine its color
A chemical reaction involves:
Complete destruction of matter
Rearrangement of atoms
No change in atomic structure
Which of the following is a SOLID element at room temperature?
Hydrogen
Iron
Oxygen
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 has new, unique properties
It weighs less
Scientists use IR spectrometers to:
Detect chemical "signatures"
Weigh substances
Measure sound waves
When iron and sulfur combine, they form:
A mixture
Iron sulfide
A gas
An element cannot be:
Broken down by ordinary means
Seen under a microscope
Heated
The process of elements combining chemically is called:
Mixing
Compound formation
Evaporation
