The observation, identification, description, experimental investigation, and theoretical explanation of phenomena is all part of science. Nothing is immune to the scientific process: from charm quarks that haven't existed naturally since the beginning of time to Pluto, recently demoted from planet to dwarf planet. Questions on knowledge about the material and physical aspects of our world are asked and answered here.

472,004 Questions
Periodic Table

What is the fourth element of the periodic table of elements?

Beryllium (Be)

See the Web Links and the Related Questions for more information.

Sound Waves

Is silence a sound?

According to Merriam-Webster, the definition for silence is:

"1: forbearance from speech or noise2: absence of sound or noise"
Units of Measure
Weight and Mass
Atomic Mass

What instrument measures mass?

A Beam balance (or Beam scale) is a device to measure weight or mass.


Boiling waters idepended variable?

No, an independent variable is something that changes in an experiment.


Which subjective method is best to measure human activity of adults discuss in detail?

There are 3 subjective methodes of measuring human behaviour.

1. Self-report questionnair

2. Dairy methode

3. Behavioural observation.

In my opinion Behavioural observation is the best way to measure human activity. Behavioural observation is aim to collect data about physical activity behaviour. In this methode, we can observer the beahviour of a patient or a subject during any perfomance regarding the activity, sposed by psychlogist.

Nintendo DS
Nintendo Wii

What are the 5 oceans of the world?

Arctic Ocean, Atlantic Ocean, Indian Ocean, Pacific Ocean, Southern Ocean

Medical Technologies

Given unlimited resources, what scientific or medical problem would you investigate?

At the risk of being too obvious, I'm going to have to go with a vaccine and treatment for the coronavirus.

Atomic Mass

What is gold's mass number?

The only stable, and only naturally-occurring isotope of gold has mass number of 197. This is the number of protons and neutrons in each nucleus.

Gold's atomic number is 79. This is the number of protons found in each gold atom. This determines its place in the periodic table, and its chemical properties: it is the defining property of gold.

A nucleus with a different number of neutrons and the same 79 protons would be a different isotope with a different mass number; a nucleus with a different number of protons would not be gold, but some other element.

Math and Arithmetic

How many times does 3 go into 100?

100 ÷ 3 = 33.33 recurring.
Or 100 ÷ 3 = 33 remainder 1.

Math and Arithmetic
Percentages, Fractions, and Decimal Values

What is the midpoint of 5.49 5.48?

It is 5.4085


What is the scientific attitude and what attitudes and characteristics define a good scientist?

A good scientist should possess the following qualities:

1. A scientist must be curious about the world Example: Galileo Galileo's curiosity about the heavenly bodies made him the first person to use a telescope to study the moon, the sun, the planets and the stars.

2. A scientist is logical and systematic Example: Among the reasons why Gregor Mendel discovered the principles of heredity when others have failed was his logical experimental methods and his careful and accurate record keeping.

3. A scientist is open-minded and free of bias Example: An open-minded person is one who can modify plans or discard hypotheses if necessary. One such person was Johannes Kepler who was hired to develop evidence that planets moved along perfect circles.

4. A scientist is intellectually honest Example: Isaac Newton built his laws of motion on the previous work of Galileo and others.

5. A scientist works hard and is persistent Example: Marie Curie was the first person ever to be awarded the Nobel Prize twice. It was not surprising considering how hard she worked.

6. A scientist does not jump to conclusions Example: John Dalton's atomic theory was backed by experimental evidence. He was not the first to propose that the atom was the smallest particle of matter, but he was the first to use experimental evidence to support his theory.

7. A scientist is a creative and critical thinkerExample: Albert Einstein was able to derive his theory of relativity because he went beyond what was given and known at that time. He saw links and connections where others did not. He looked at things from different perspectives.

8. A scientist is rational

9. A scientist is willing to suspend judgment until he is sure of his results

10. A scientist tries new approaches to arrive at solutions

In addition:

A scientist must have an open mind and be curious. It is fine to have an idea about how or why something is the way it is, but the scientist should then seek to prove or disprove this "hypothesis" and should then be willing to change their ideas depending on the results of their experiments, rather than to continue believing in their original idea even if the evidence of their experiments is sticking up against it. 1.Keen Observer 2.creative 3.patient 4.curious 5.humble 6.intellectually honest 7.objective 8.Aware of the limitations of Science 9.Persevering 10.Open minded


The forces of attraction between two objects varies with what two factors?

Depends on the force but for gravity the answer is mass and distance.

Acids and Bases

What are some examples of chemical and physical changes?

Physical Changes

  • Change of state (such as from solid to liquid or from gas to liquid)
    • Specific examples of state change include water freezing, alcohol evaporating and dry ice (solid carbon dioxide) subliming
  • Absorption of water into a towel
  • Crumpling a piece of paper
  • Pulling copper into a thin wire - a change of shape, but not a change of composition
  • Cutting a material such as wood
  • Tearing a piece of tin foil
  • Breaking glass
  • Deflating a basketball
  • Mixing different solids (such as solid sulfur and iron filings)
  • Inflating a volleyball
  • Cloud forming in the sky

Chemical changes

  • Burning a log of wood
  • Mixing an acid with a base, producing water and a salt.
  • Photosynthesis - a process in which carbon dioxide and water are changed into sugars by plants.
  • Cracking heavy hydrocarbons to create lighter hydrocarbons (part of the process of refining oil).
  • Cooking examples: popcorn, cake, pancakes, and eggs
  • Oxidation examples: rust or tarnishing
  • Combustion
  • Mixing chemicals
  • Rotting of fruit
  • Cooking rice
  • Explosion of fireworks
  • Tarnishing silver
  • Lighting a match
  • Chewing/digesting food
  • Rusting nail
  • Burning gas in a stove
  • Oxidizing food for energy
  • Roasting a marshmallow
  • Adding food coloring to icing
  • Frying an egg
  • Burning a magnesium strip

The following can indicate that a chemical change took place, although this evidence is not conclusive:

  • Change of color (for example, silver to reddish-brown when iron rusts)
  • Change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat
  • Change of form (for example, burning paper)
  • Light, heat, or sound is given off
  • Formation of gases, often appearing as bubbles
  • Formation of precipitate (insoluble particles)
  • The decomposition of organic matter (for example, rotting food)
Earth Sciences

What is the rock cycle song?

SEDIMENTARY rock Has been formed in layers Often found near water sources With fossils from decayers
Then there's IGNEOUS rock Here since Earth was born Molten Lava, cooled and hardened That's how it is formed
These two types of rocks Can also be transformed With pressure, heat and chemicals METAMORPHIC they'll become

(sung to the tune of row row row your boat)

(=**=) (


What would the density of a cube of aluminum be?


Human Behavior

What determines whether you are left or right handed?

Scientists aren't entirely sure, although they're pretty positive it's genetic. For a long time, a prevailing theory was that handedness is determined by gene expression in the left or right hemisphere of the brain. However, newer research suggests that even before the motor cortex is developed, an early asymmetry in the spinal cord is actually what determines right or left handedness.

Urinary System

What are the tubes called that carry urine away from the kidneys to the urinary bladder?

ureter carry urine towards urinary bladder from kidney

History of Science

What superstitious beliefs have a scientific basis?

As of 2007 Atheism has been proven to be a religion with zero honesty or truth! Atheism is all fiction; confirmed by honest scientific tests! The Atheists have also lost in the Supreme Court! God won!

Every single sentence of history in the honest Bible has anywhere from three to over 250 records found to confirm each line! The Bible is all truths, facts!

Growth Rates
Carbonated Beverages

Does Coke stop your growth?

It’s weird, but sort of. Kids drinking too much Coca-Cola disturbs their growing a bit, since kids need milk and water to grow easier. Coke just slows down the growth process a bit if you drink too much because you’re not drinking milk. So the answer is sort of. It can disturb the process if you drink too much.

Math and Arithmetic

Convert centigrade to Fahrenheit?

hmmm. not sure if that gives a correct result

compare: F = 9/5C + 32 C = 5/9F - 32


Is the independent variable the thing you change?


The independent variable is also known as the manipulated variable.

In an experiment where you need to test different objects, the independent variable would be the different objects.

Cooking Equipment

Why is the pan handle made of plastic?

because if pan handle made of paper our hand can burn

Earth Sciences

If we can't tunnel through the Earth, how do we know what's at its center?

First, scientists are pretty sure the Earth's core is about 80 percent iron. How they know that is a series of educated guesses.

For starters, they can be reasonably sure of the planet's mass based on its gravitational pull. The material on the surface isn't dense enough to match up with that mass, so the rest of the Earth has to be much denser.

Iron, meanwhile, is one of the most prevalent elements in the universe, but it isn't all that evident in the Earth's crust. Since scientists would expect more iron to be in our planet and it's a fairly dense element, that leads to the conclusion that the Earth's core is mostly iron. They theorize that it was pulled to the core over millions of years. By examining different seismic waves, they know that the inner part of the core is solid and the outer core is molten.

It's a lot more scientific than I've made it sound, but hopefully that gets at the gist of it.


10 examples of physical change and chemical change?

Physical Change:

*Milo dissolves into hot milk

*A plate is dropped and shatters

*Grass in mowed

*Metal Knife is sharpened

*Breakfast Cereal goes soggy

Chemical Change:

*Wood burns to form black charcoal

* A green tomato ripens and turns red

* Fireworks explode to form colourful light and loud sounds

* Vegetables scraps in the compost bin decompose to form rich soil

* An egg is cooked to become a white and yellow solid

Plate Tectonics

What is the process that powers plate tectonics?

Convection, as heat from the mantle is transferred to the lower crust, which can move very slowly in response to the increased upward pressure. The heat makes the rock liquid (magma) in some areas, allowing it to flow upward to the surface, thus creating spongebob squarepants!


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