answersLogoWhite

0

🧪

Science Experiments

Experiments often conducted by students to test different scientific theories and hypotheses

11,111 Questions

What is the outward appearance of a trait called?

phenotype
The physical appearance of a trait is called a phenotype, not to be confused with a genotype( which is your genetic makeup) The way I remember is phenotype and physical both start with a p, and genotype and genetic both start with a g.

What is the independent variable of an experiment?

The independent variable is how each jar is covered.

The dependent variable is the amount of maggots in each jar.

The control groups are Jar1( no covering, left open), and Jar 2 (covered with netting).

The experimental group is Jar 3 Sealed from the outside).

Gene regulation is necessary in living organisms?

To avoid wasting energy and resources on producing proteins that are not needed nor are already available.

What is a good title for a science fair project about growing plants in different types of light?

A suitable title for a science fair project exploring how different types of light affect plant growth could be "The Impact of Light Spectrum on Plant Growth." This title succinctly conveys the focus of the project while hinting at the experimental design and outcomes. It effectively communicates the key variables being studied and the overall goal of the investigation.

What is the reaction of iron and sulphur?

The iron and sulphur are heated to a certain temperature until they start to react with each other. The iron and sulphur bind together in the heating process and turn into one compound. That compound is IRON SULPHIDE. When the two are both chemically joined they turn red in colour and the process of turning the mixture in to the compound is complete.

What is lustre?

A soft shining light reflected from the surface of something, for eg. the lustre of gold.

When sodium carbonate solution is added to benzocaine what is the gas that evolves?

Because the reaction mixture contains a small amount of sulfuric acid, the sodium bicarbonate will neutralize the solution and in the process, will produce CO2.

What is size dependent properties?

An increase in size can two significant effects on the organism: first greater size means a decrease in the ratio between surface area and mass (usually) so that heat loss across the skin decreases. Larger animals have a lower rate of metabolism by weight. Secondly is in height's effects on blood pressure differences. In a two meter human we have to adjust our heart rates to avoid orthostatic hypotension. The problem for a giraffe is even more dramatic. hope it helped you. :)

What forms when iron comes in contact with oxygen in water?

When iron comes in contact with oxygen in water, it can form iron oxide, commonly known as rust. Rust is a reddish-brown compound that forms on the surface of the iron as a result of the oxidation reaction. This process weakens the iron structure and can lead to deterioration over time.

How much heat in kcal must be added to 5.0 kg of water at room temperature 20C to raise its temperature 44C?

If you mean the final temperature is 44C, then do the following:

Q = mcΔT

m = 5.0kg H2O = 5000g H2O

cH2O = 1.00cal/g*C

ΔT = 44C-20C = 24C

1000cal = 1kcal

1000g = 1kg

50kg H2O = 1000g H2O/1kg H2O = 5000g H2O

Q = 5000g H2O x 1.00cal/g*C x 24C = 120,000calories

120,000cal x 1kcal/1000cal = 120kcal

If you mean the temperature change is 44C, then do the following:

Q = mcΔT

m = 5.0kg H2O = 5000g H2O

cH2O = 1.00cal/g*C

ΔT = 44C

1000cal = 1kcal

1000g = 1kg

50kg H2O = 1000g H2O/1kg H2O = 5000g H2O

Q = 5000g H2O x 1.00cal/g*C x 44C = 220,000 calories

220,000cal x 1kcal/1000cal = 220kcal

When does oobleck act like a solid?

Oobleck is a non-Newtonian fluid providing a realization of a shear-thickening fluid.

Non-newtonian means that at a state of rest, it acts like a liquid, but when outside force is exerted upon it, it acts like a solid.

A good oobleck example is cornstarch with water, a common thickening agent used in cooking. It is also a very good example of a shear thickening system. When a force is applied to a 1:2.5 mixture of water and cornstarch, the cornstarch acts as a solid and resists the force.

There is a nice explicative video on You tube in 'Related links' clickable just below this answer.

How much salt can water dissolve?

100 grams pure water can hold about 38 grams of sodium chloride. at the temperature rises nearly boiling 100 C, it increases to about 40 grams per 100 grams of water

What are abiotic factors in an ecosystem?

Abiotic factors affect an environment in many ways. For instance, if there is too much of abiotic fators in an ecosystem than there is biotic factors, the biotic factors will start to decrease due to the lack of biotic factors (food for predators). Therefore, the biotic factors will become extinct.

What is SI Unit of length mass and time?

By unit of mass add time and conversion ,we can say that

SI Unit of length mass is kg

and SI Unit of time is seconds (sec).

Is water a variable?

It can be, it depends on your experiment. Independent variables are the variables in an experiment that will not change. If you want to do an experiment that tests how something reacts with water, then starting with a clean controlled water sample for each test would be necessary and an independent variable. Conversely, if you were testing the cleanliness of multiple water sources, then the ideology of clean water would be your dependent variable, which would change upon each testing. WIth your given information I cannot say whether or not you would want water to be either a dependent or an independent variable for your experiment.

Why does steam at 100 Celsius cause sevear burn than boiling water?

This is so because when a 100 degree steam comes in contact with our skin it converts into water , energy required to convert in water is taken from our skin in form of latent heat which causes far more severe burns than putting our hand in 100 degrees water :) . dont try this experimentally .

What does heat to constant mass mean?

Mass that funnily enough is constant - the term is used when an object or two object change or interact energy or force, but the mass of the system or part of it is the same before and after the change/interaction.

Is salt water a mixture?

well since it is salt and water i guess it is a mixture

How are colours added to felt?

Because of the type of fiber wool is color must be added with an acid based dye, which are actually harmless, Kool Aide is actually a kind of acid dye. These dyes are added to water and heated to make the dying process work. Acrylic or synthetic felts are made from colored plastic pellets which are melted and poured in strands to make felt. Andie- www.americanfeltandcraft.com

Why do need to stir the water continuously during heating?

by heating we increase the inter moleculer space of the solvent so the solute particles get in the increased space and by stirring also the same purpoose is served . in short it is done so as to dissolve the solute in the solvent

Heating will help solutes dissolve in many solvents. For example salt will dissolve in hot water better than cold water.

Many chemical reactions either require energy input to initiate a reaction, or they react better at higher energy levels.

Endothermic reactions require energy to proceed.

Even exothermic reactions may require activation energy to initiate the reactions.

Or... many reactions won't run efficiently or completely at cold temperatures.

Explain the effect of temperature on the rate of dissolving using the particle theory.?

One of the five particle theory's of matter states that particles move faster at a higher temperature. When you put salt in warm water, it dissolves much faster then when you put salt in cold water because the higher the temperature the faster the salt will dissolve in the water.