genesis
how many chromosomes do humans have in most of their body cells?
46 chromosom
What is the speed of sound in air?
343 meters per second
what causes a chemical reaction?
moving molecules hit each other, breaking their bonds
What is the primary source of natural light on Earth?
the sun
what is the trend in group 1 elements
increases as you go down the group
which eye color is typically dominant brown or blue?
brown eye
what type of wave is sound?
Sound is a mechanical wave
one example of chemical reaction
Chemical battery usage etc
what do we call the bending of light when it hits a surface?
reflection
What part of the cell contains the genetic material?
nucleus
what do we call the highest point of a sound wave?
is called the crest
What is a chemical?
any substance that has a defined composition
what color does light appear when it passes through a prism?
It appears as a rainbow of colors
what do we call different versions of the same gene?
alleles
What is the phenomenon called when sound waves bounce off a surface?
This is called echo
What is the most common chemical reaction?
combination , decomposition , single displacement , double displacement , combustion
what is the name of the phenomenon that bends light as it passes through different mediums?
this is called refraction
what is the extra chromosome in Down syndrome?
chromosome 21
what is the frequency range of human hearing?
is typically between 20 Hz and 20,000 Hz
what is the difference between a chemical process and a physical process in chemistry?
a chemical change alters the substance s composition, while a physical change does not
what is the unit used to measure the brightness of light?
is called a lumen