Science Questions and Answers

Science

The cell theory is an explanation of what cells are and why they exist. The three main parts are: 1) All living things are made of cells and their products, 2) New cells are created by old cells...

Latest answer posted July 17, 2012, 2:55 pm (UTC)

2 educator answers

Science

Any substance dissolved in another substance is considered a solution. The solvent (the stuff that does the dissolving) in most household substances is water. So, anything dissolved in water would...

Latest answer posted June 21, 2018, 5:01 pm (UTC)

2 educator answers

Science

Although on the surface it seems that computers are very sophisticated devices, capable of accomplishing complex tasks, in fact, computers can only do a limited number of very simple tasks on a...

Latest answer posted September 19, 2015, 9:37 pm (UTC)

2 educator answers

Science

While the functions and applications of a computer are almost endless, we can sense four primary purposes that are all linked to data (information): Entering data, manipulating data, viewing...

Latest answer posted July 6, 2009, 9:23 pm (UTC)

1 educator answer

Science

The imaginary vertical lines that run from the North pole to the South pole on a map are called longitudinal lines. The Prime Meridian is the longitudinal line that has a value of 0 degrees. On a...

Latest answer posted February 1, 2016, 2:01 pm (UTC)

1 educator answer

Science

The control is the plant that receives only pure water. It is referred to as the control, not control variable. The dependent variable is the height of each of the sunflower plants after the two...

Latest answer posted August 28, 2011, 6:28 am (UTC)

1 educator answer

Science

There are a number of factors that enable life to exist on Earth. Here is a brief list of some of those factors: Distance from Sun: Earth is at the right distance from the Sun, the star it orbits....

Latest answer posted May 12, 2016, 1:06 pm (UTC)

1 educator answer

Science

Similarities ... → Both involve in production of energy → Both involve the exchange of gases → Both the process takes place in cell organelle which was considered as endosymbiotic organism. They...

Latest answer posted June 23, 2012, 5:12 pm (UTC)

3 educator answers

Science

A car is not a living thing because it does not fulfill some key characteristics that define living things. All living things are composed of cells. Unicellular organisms are composed of a single...

Latest answer posted April 18, 2016, 12:33 pm (UTC)

1 educator answer

Science

Most products and materials that would be found in your home are compounds, mixtures or alloys. Only the most stable elements will resist reacting over time. Metals found in the home are often...

Latest answer posted January 21, 2016, 10:24 pm (UTC)

1 educator answer

Science

It's important for scientists to know the properties of matter because all things are made up of matter. Each type of matter has different physical characteristics and scientists need to know and...

Latest answer posted November 18, 2015, 8:36 pm (UTC)

2 educator answers

Science

Igneous, sedimentary, and metamorphic are the three types of rocks. Among these, igneous and metamorphic rocks share the following similarities: Both of them are types of rocks. Temperature is a...

Latest answer posted April 9, 2018, 11:17 am (UTC)

1 educator answer

Science

The ranking of the given items from largest to smallest is as follows: Organism > Cell > Nucleus > Chromosome > Gene > DNA DNA is a molecule that can be thought of as the blueprint...

Latest answer posted December 7, 2018, 12:04 pm (UTC)

1 educator answer

Science

Earth is the only planet in the solar system that is known to have life on it. None of the other planets in the solar system have life on them. Earth's uniqueness (in this regard) is due to a...

Latest answer posted February 16, 2016, 6:10 pm (UTC)

1 educator answer

Science

The various factors that support life on Earth include the following: Distance from the Sun: Earth is at just the appropriate distance from the Sun. If we were closer, the planet would be warmer....

Latest answer posted May 14, 2016, 10:43 am (UTC)

1 educator answer

Science

Let's reason our way through this.Organelles are the substructures (such as mitochondria and chloroplasts) inside cells that perform particular functions. They are therefore smaller than...

Latest answer posted July 22, 2016, 9:09 pm (UTC)

1 educator answer

Science

Thermometers are used to measure temperature. Below is a list of some scenarios in which a thermometer might be used. - To measure the outdoor temperature. - To measure body temperature during a...

Latest answer posted October 22, 2015, 12:21 am (UTC)

1 educator answer

Science

The reliability of an experiment is the consistency of the results. The degree of reliability is shown by the closeness of agreement of data for several repetitions of the experiment. Reliability...

Latest answer posted November 29, 2015, 9:03 pm (UTC)

1 educator answer

Science

One reason for sudden hair and nail growth could be due to an improvement in your overall health. There are many vitamin deficiencies that can cause your hair and nails to grow slowly. Sometimes...

Latest answer posted May 25, 2010, 8:24 am (UTC)

3 educator answers

Science

Elements that are metals tend to lose electrons and become positively charged ions called cations. Elements that are nonmetals tend to gain electrons and become negatively charged ions called...

Latest answer posted March 12, 2016, 7:52 pm (UTC)

1 educator answer

Science

Similarities: Both plant and animal cells have a nucleus and specialized organelles like a mitochondria, lysosomes, and a golgi apparatus. Plant and animal cells both have cell membranes....

Latest answer posted August 28, 2017, 5:33 pm (UTC)

1 educator answer

Science

When you set up an experiment, you have to have one set up where you introduce the independent variable (the experimental set up) and one where you do not (the control). That way, you can compare...

Latest answer posted September 17, 2010, 11:32 pm (UTC)

2 educator answers

Science

The initial observation is that Gary is suffering from slimtosis. The independent variables would be the seaweed that is rubbed on Gary and the Dr. Kelp that Gary drinks. The dependent variable...

Latest answer posted February 17, 2016, 10:00 pm (UTC)

1 educator answer

Science

To understand what energy is created by burning wood, one must first look at the two basic types of energy: potential energy and kinetic energy. Potential energy is defined as any type of stored...

Latest answer posted November 18, 2015, 11:13 pm (UTC)

1 educator answer

Science

We use several products of science everyday and science is pretty much involved in all our activities. Some of the key scientific products that we use daily include, electricity, transportation...

Latest answer posted October 27, 2015, 5:06 pm (UTC)

1 educator answer

Science

The three basic tenets of the cell theory are: 1.) All living things are made of cells 2.) Cells are the smallest structural and functional unit of living organisms 3.) All cells come from...

Latest answer posted September 17, 2015, 11:03 pm (UTC)

2 educator answers

Science

The four major environmental issues that I see present the biggest challenge to man are as follows: 1) Overpopulation combined with increased use of resources such as fossil fuels by nations such...

Latest answer posted March 28, 2011, 5:00 am (UTC)

8 educator answers

Science

When molecules are too large or too charged to cross the plasma membrane by diffusion or osmosis, there are other methods to accomplish their transport into or out of the cell. For example, some...

Latest answer posted October 16, 2015, 4:07 pm (UTC)

2 educator answers

Science

When problem solving, knowing the scientific method can come in handy. For problems plaguing a community (parking, pool hours, neighborhood fees, recycling bins), community members can apply the...

Latest answer posted June 21, 2016, 6:59 pm (UTC)

1 educator answer

Science

The atomic mass of an element is the total number of protons and neutrons in the nucleus of the atom. Almost. Now, here's the rest of the story. The atomic mass of an atom, as given on the periodic...

Latest answer posted August 17, 2011, 11:17 am (UTC)

1 educator answer

Science

There is only one characteristic that is common to all lipids, and that is their inability to dissolve in water. They will, however, dissolve in a variety of organic solvents, such as benzene,...

Latest answer posted July 29, 2011, 5:49 am (UTC)

1 educator answer

Science

This question can be solved using the classic equation of motion: distance = velocity * time. We have two known parameters and one unknown parameter; however, in order to solve the problem we must...

Latest answer posted February 23, 2012, 10:20 pm (UTC)

1 educator answer

Science

Ions are expressed by the Chemical Symbol of the element(s) followed by a superscript of the charge the ion carries. For example an Oxide ion would be `O^(2-)` Oxide is an oxygen anion which gains...

Latest answer posted August 22, 2013, 8:06 pm (UTC)

1 educator answer

Science

When we mix sand and water, no reaction takes place. The sand simply settles down at the bottom of the water container. This is because sand is heavier than water and hence cannot float in water....

Latest answer posted March 18, 2016, 9:19 am (UTC)

1 educator answer

Science

The human body has 206 bones.

Latest answer posted August 20, 2013, 12:02 pm (UTC)

4 educator answers

Science

Prokaryotes can be divided into microorganisms called bacteria and archaea. Four differences between bacteria and archaea include: 1. Bacterial cell walls have peptidoglycan (mesh-like structure...

Latest answer posted October 13, 2011, 12:11 pm (UTC)

1 educator answer

Science

A chemical reaction takes place when milk is mixed with vinegar. Milk contains protein, out of which about 80% is known as casein and the rest is called whey protein. When milk is mixed with...

Latest answer posted September 23, 2018, 6:02 am (UTC)

1 educator answer

Science

The difference between uniform and non-uniform mixtures is the degree at which the materials are mixed and the sameness of their composition throughout the mixture. Another word for a uniform...

Latest answer posted September 19, 2015, 11:33 pm (UTC)

1 educator answer

Science

Parallel circuits are used in homes because the loads can be operated independently of each other. That means that you can have an electrical item turned on and running without needing to have all...

Latest answer posted November 21, 2015, 1:35 am (UTC)

1 educator answer

Science

The beaker would not be good because it is hard to measure accurately to a millimeter. Pipettes generally are used to dispense liquids by the drop and not for actually measuring the volume of a...

Latest answer posted September 1, 2010, 12:05 am (UTC)

1 educator answer

Science

Pressure and temperature are related to each other by Gay-Lussac's Law. This law says that P1T1=P2T2, or the initial pressure multiplied by the initial temperature is equal to the product of the...

Latest answer posted May 4, 2010, 3:08 am (UTC)

3 educator answers

Science

The balanced chemical equation for the reaction between Sulphuric Acid (H2SO4) and Calcium Hydroxide (Ca(OH)2) will be as follows: H2SO4 + Ca(OH)2 `->` Ca SO4 +2 H2O One molecule of Sulphuric...

Latest answer posted February 21, 2014, 7:24 pm (UTC)

1 educator answer

Science

Saturated, unsaturated and supersaturated refer to three different conditions of a solution. A saturated solution contains the maximum amount of solute that will dissolve at that temperature. Any...

Latest answer posted November 19, 2015, 4:27 am (UTC)

1 educator answer

Science

The number of bones a person has in their body generally depends on their age. A human newborn baby has approximately 270 bones in his or her body. As the person ages and develops, some of the...

Latest answer posted November 6, 2013, 12:02 am (UTC)

1 educator answer

Science

While consulting a veternarian is probably the wisest step to take, there is some general information that is available to you from different sources. One of the basic considerations is the breed...

Latest answer posted November 26, 2009, 2:38 am (UTC)

2 educator answers

Science

The reactivities of elements can be predicted by periodic trends (patterns within the Periodic Table.) Let's start with periodic trends. An element's reactivity is its tendency to lose or gain...

Latest answer posted November 27, 2015, 7:40 pm (UTC)

1 educator answer

Science

I would argue that research is important in any field. Without research in the field of psychology, our knowledge and understanding of the human mind would stagnate, and there is always more to be...

Latest answer posted September 30, 2020, 11:15 am (UTC)

1 educator answer

Science

The purpose of the battery in a series circuit is to give the circuit a source of energy. The purpose of a switch in a series circuit is to make it easy to open or close the electrical circuit,...

Latest answer posted April 27, 2010, 11:55 pm (UTC)

1 educator answer

Science

The element that has three energy levels and five valence electrons in its outer level is phophorous, atomic number 15. Each row or period of the periodic table corresponds to a principal energy...

Latest answer posted December 7, 2015, 9:49 pm (UTC)

1 educator answer

Science

Take note that the nucleus of an atom is composed of protons and neutrons. And the number of particles present in the nucleus is referred as mass number (Also, called as atomic mass). mass number =...

Latest answer posted October 22, 2014, 12:00 am (UTC)

1 educator answer

Showing 1-50 of 20571