Answer:
What are Variables?
Scientists try to figure out how the natural world works. In doing so, they use experiments to search for cause and effect relationships. Cause and effect relationships explain why things happen and allow you to reliably predict what will happen if you do something. In other words, scientists design an experiment so that they can observe or measure if changes to one thing cause something else to vary in a repeatable way.
The things that are changing in an experiment are called variables. A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled.
The independent variable is the one that is changed by the scientist. Why just one? Well, if you changed more than one variable it would be hard to figure out which change is causing what you observe. For example, what if our scientific question was: "How does the size of a dog affect how much food it eats?"; then, during your feeding experiments you changed both the size of the dog and the time of day the dogs were fed. The data might get a bit confusing— did the larger dog eat less food than the smaller dog because of his size or because it was the middle of the day and dogs prefer to eat more in the morning? Sometimes it is impossible to just change one variable, and in those cases, scientists rely on more-complicated mathematical analysis and additional experiments to try to figure out what is going on. Older students are invited to read more about that in our Experimental Design for Advanced Science Projects page. To be clear though, for a science fair, it is usually wise to have only one independent variable at a time. If you are new to doing science projects and want to know the effect of changing multiple variables, do multiple tests where you focus on one independent variable at a time.
The dependent variables are the things that the scientist focuses his or her observations on to see how they respond to the change made to the independent variable. In our dog example, the dependent variable is how much the dogs eat. This is what we are observing and measuring. It is called the "dependent" variable because we are trying to figure out whether its value depends on the value of the independent variable. If there is a direct link between the two types of variables (independent and dependent) then you may be uncovering a cause and effect relationship. The number of dependent variables in an experiment varies, but there can be more than one.
Experiments also have controlled variables. Controlled variables are quantities that a scientist wants to remain constant, and she or he must observe them as carefully as the dependent variables. For example, in the dog experiment example, you would need to control how hungry the dogs are at the start of the experiment, the type of food you are feeding them, and whether the food was a type that they liked. Why? If you did not, then other explanations could be given for differences you observe in how much they eat. For instance, maybe the little dog eats more because it is hungrier that day, maybe the big dog does not like the dog food offered, or maybe all dogs will eat more wet dog food than dry dog food. So, you should keep all the other variables the same (you control them) so that you can see only the effect of the one variable (the independent variable) that you are trying to test. Similar to our example, most experiments have more than one controlled variable. Some people refer to controlled variables as "constant variables."
In the best experiments, the scientist must be able to measure the values for each variable. Weight or mass is an example of a variable that is very easy to measure. However, imagine trying to do an experiment where one of the variables is love. There is no such thing as a "love-meter." You might have a belief that someone is in love, but you cannot really be sure, and you would probably have friends that do not agree with you. So, love is not measurable in a scientific sense; therefore, it would be a poor variable to use in an experiment.
7) All of the following are
external factors of the
photosynthesis EXCEPT*
O A. Light intensity
O B .Temperature
O c. Chlorophyll content
O D .Oxygen
Answer:
D. Oxygen
Explanation:
External factors of photosynthesis
Light intensityTemperatureChlorophyll contentCarbon dioxideImmediate product
GlucoseByproduct
OxygenHope this helps ;) ❤❤❤
Questions below :) These ones are fairly easy :P
Answer:
See below.
Explanation:
1. The water here is the solvent, and the 'sugar and fruit specific chemicals' are considered the solute. That is as the solute is the component dissolved in the solvent.
2. The collision theory states that the greater the collisions, the greater the rate of reaction. When powdered sugar is placed in the water (solvent) it occupies more surface area, resulting in more collisions that speed up the rate of reaction, compared to a cube of sugar - that occupies less surface area. Therefore, the powdered sugar dissolved faster.
3. Molarity describes the number of moles of a substance per unit of volume. The standard unit of volume is liter, giving you the standard units (mol/l). Molality describes the number of moles per unit of mass, typically kilograms (mol/kg).
The concentration of a solution can be given in moles of solute dissolved per kilogram of solvent for molality, and moles of solute dissolved in liters of solvent for molarity. Molality is generally used for concentration.
12 points
What's the difference between a hypothesis and a theory?
A. Theory" is another word for "fact;" "hypothesis" is another word for "guess."
B. Hypothesis can't be proven; theories can.
C. Theories have been confirmed through tests; hypotheses haven't.
D. Theories contain many hypotheses; a hypothesis only contains one theory.
Answer:
C. Theories have been confirmed through tests; hypotheses haven't.
Explanation:
In simple terms, a theory is something that has been studied, tested, and validated with results whereas a hypothesis is when one "guesses" or "assumes" about something with no prior tests. In short, a hypothesis can be best understood as just a proposal while theory can be taken as a validated result.
Through various trials and tests, a theory arrives whereas a hypothesis can be the initial stage of the testing. For example, in saying that "My hypothesis is that this metal cannot bend" is just assuming or expressing one's opinion. But when the metal is tested and a definite result is found, then that becomes a theory.
So, we can say that a theory is a confirmed result after tests while a hypothesis is not tested or confirmed with a definite result.
Thus, the correct answer is option C.
What is the relationship (direct or indirect) between wavelength of light and the energy of its photons?
Answer:
The energy of a wave is directly proportional to its frequency, but inversely proportional to its wavelength. In other words, the greater the energy, the larger the frequency and the shorter (smaller) the wavelength.
The water displacement method is used to find the mass of an
irregularly-shaped solid object.
Answer: True
Explanation:
I did the problem online
The mass and the density of the irregularly shaped objects can be measured and estimated by the water displacement method. Thus, the statement is true.
What is the water displacement method?The water displacement method has been defined as the method that measures and estimates the volume and mass of objects that are irregular in shape and can be done by submerging the object in a solution like water.
The water pushed out can be used to measure the mass and the volume of the object if the density is already known. It uses fluid displacement to measure the mass of irregularly shaped objects. Anyone quantity must be known so as to estimate the mass of the object.
Therefore, the statement about the water displacement method to calculate the mass of irregular shapes is true.
Learn more about the water displacement method, here:
https://brainly.com/question/11182072
#SPJ2
Your question is incomplete, but most probably your full question was, The water displacement method is used to find the mass of an irregularly-shaped solid object. (True or false)
Explain how and why a drop of syrup can spread through the water in a beaker without stirring?
Answer:
See the answer below
Explanation:
A drop of syrup would spread through water because water molecules interact and dissolve the syrup molecules and the molecules of the syrup randomly diffuse into the water from the region of higher concentration to the region of lower concentration till they become evenly distributed in the water.
Once the molecules become evenly distributed into the water, an equilibrium is established and there is no longer net movement.
What are 3 benefits of being a part of the microgrid?
Answer:
1.Improves electric reliability.
2.Enhance recovery.
3.Promotes clean energy.
Explanation:
Some people suffering from the darkness still had their lights from facilities with microgrids.Power outages they can be dangerous.Microgrids keep the power flowing by disconnecting.It also generate possibly batteries then the microgrids customers are served until power is restored on the Central grid.
If an atom has 16 protons, 14 neutrons, and 18 electrons. What is the
charge of the nucleus? *
Answer: negative
Explanation:
There are two more electrons than protons so the charge is -2.
What period is the atom in?
1.
What group is the atom in?
What is the name of this atom?
What other atom would have similar
properties to the atom?
Will this atom conduct electricity well?
Answer:
Put these atoms in order from most negative overall charge to least negative
overall charge.
11 Atom X: 104 protons, 102 electrons
11 Atom B: 24 protons, 18 electrons
1 Atom Q: 15 protons, 16 electrons
11. Atom P: 7 protons, 10 electrons
Explanation:
What period is the atom in?
1.
What group is the atom in?
What is the name of this atom?
What other atom would have similar
properties to the atom?
Will this atom conduct electricity well
Which statement is NOT a part of the scientific theory of cells? *
Answer:
I'm sorry but there is not enough context to answer your question.
Explanation:
BRAINLIEST TO FIRST ANSWER I JUST NEED HELP my teacher refuses to help me so I just want to know im doing this right pretend the ones with slashes are fractions 0.56kg = ? mg 0.56kg x 1000 g/1 kg x 1000 mg/1 g = 560,000 mg bro im so confused also heres the problem if that's hard to understand i just want to know im doing it right
Answer:
0.56kg=?mg
0.56kg x (1000 g/1kg) X (1000mg/1g) = 560,000mg
Explanation:
You got it right. Great Job!
How does publishing in scientific journals help ensure that science leads to
reliable results?
Answer:
it helps prove the fact or opinion and test that and archive it
. The density of gold is 19.32 g/mL. A U.S. $5.00 gold coin has a diameter of 1.62 cm and a thickness of 0.085 cm. The price of gold is currently $53.90 per gram. What is the value of the gold in the coin. V = π r2 h.
Answer:
$182 is the value of the gold in the coin
Explanation:
Diameter is 2r, the ratio of the coin is = 1.62cm / 2 = 0.81cm
Following the formula of the volume of the coin:
V = π r² h
V = π*(0.81cm)²*0.085cm
V = 0.172cm³ = mL
As the density of the gold is 19.32g/mL, the mass of 0.1752mL of gold is:
0.1752mL * (19.32g / mL) =
3.385g is the mass of the coin
As the price of the gold is $53.90 / g, the value of the gold in the coin is:
3.385g * ($53.90 / g) =
$182 is the value of the gold in the coinX
Which process is a chemical change?
A burning a match
B. boiling water
OC melting ice
OD. breaking glass
difference between speed and velocity
Answer:
speed is a scalar quantity and velocity is a vector quantity.
Speed is distance/time and velocity is displacement/time
Answer:
Velocity is vector and speed is scalar
Explanation:
what is the radius of earth 6378000 meters in scientific notation
Answer:
[tex]6.378*10^{6}m[/tex]
Explanation:
we have zeroes so that can be
[tex]6378*10^{3} m[/tex]
and we can continue moving the decimal point three more times
[tex]6.378*10^{6}m[/tex]
6. Many changes have been made to atomic theory since Daltons time.
A. List the key difference between modern atomic theory and dalton's atomic
theory
B. What important aspect of scientific theories is illustrated by these differences
Answer:
A. Modern atomic theory is, of course, a little more involved than Dalton's theory but the essence of Dalton's theory remains valid. ... Also, there are different kinds of atoms (differing by their masses) within an element that are known as "isotopes", but isotopes of an element have the same chemical properties.
B. The explanation becomes a scientific theory. In everyday language a theory means a hunch or speculation. Not so in science. In science, the word theory refers to a comprehensive explanation of an important feature of nature supported by facts gathered over time.
If 25 g of CH4 and 100 g of O2 react, what is the total mass of the reactants and products?
Answer:
125g
Explanation:
you simply add the masses together
3.6 x 10^-3/2.1 x 10^6= 1.7 x 10^9
Answer:
(3.6×10^(-3))/(2.1×10^6) = 1.7×10^9 = False
Explanation:
How many millimeters (mm) are in 25 meters? Also, pick the choice that shows the correct math work.
O Q025 mm; because 25 m x
1 m
1.000 mm
= 0.025 mm
1.000 mm
O 25.000 mm; because 25 m x = 25,000 mm
1 m
25.000 mm; because 25 m X
100 mm
= 2500 mm
1 m
O 0.025 mm; because 25 m x
1 m
100 mm
= 0.25 mm
Answer:
25000 mm: because 25 m × 1000 mm /1 m = 25000 mm
Explanation:
We can convert 25 m to millimetre (mm) by doing the following:
Recall:
1 m = 1000 mm
Therefore,
25 m = 25 m × 1000 mm /1 m = 25000 mm
25 m = 25000 mm
Thus, 25 m is equivalent to 25000 mm
A rock has a mass of 211 grams and occupies a volume of 72 centimeters cubed what is it density?
Answer:
Density = 2.9 g/cm³Explanation:
The density of a substance is given by
[tex]Density(\rho) = \frac{mass}{volume} [/tex]From the question
The mass of the stone is 211 g
It's volume is 72 cm³
Substitute the values into the above formula and solve for the density
That's
[tex]Density(\rho) = \frac{211}{72} [/tex]Density = 2.930
We have the final answer as
Density = 2.9 g/cm³Hope this helps you
three examples of polysaccharides
Answer:
starch
Cellulose
glycogen
Hope this help :)
what is burning considered ?
A. physical change
B.chemical change
C.none of the above
D.all of the above
how many particles are their in 2.080 moles
Answer:
There are 1.253*10²⁴ particles in 2.080 moles
Explanation:
Avogadro's number is called the number of particles that make up a substance (usually atoms or molecules) that can be found in the amount of one mole. In other words, Avogadro's number is the number of molecules that one mole of any substance contains. Its value is 6.023 * 10²³ particles per mole.
So, you can apply a rule of three as follows: if 1 mole has 6.023*10²³ particles, then 2.080 moles, how many particles does it have?
[tex]amount of particles=\frac{2.080 moles*6.023*10^{23}particles }{1 mole}[/tex]
amount of particles= 1.253*10²⁴ particles
There are 1.253*10²⁴ particles in 2.080 moles
Heat energy is necessary for evaporation to occur. Energy is used to break the bonds that hold water molecules together, which is why water easily evaporates at the boiling point. In fact the process of the evaporation removes heat from the environment . Which of these every day examples illustrates how evaporation removes heat from the environment ?
Answer:
As a result of the network of hydrogen bonding present between water molecules, a high input of energy is required to transform one gram of liquid water into water vapor, an energy requirement called the heat of vaporization. Water has a heat of vaporization value of 40.65 kJ/
Explanation:
How can a fire be extinguished?
Answer:
Answer below!
Explanation:
A fire can be extinguished by many forms like fire extinguisher, but the main is water. Water can extinguish fire.
THANK U
Answer:
The preferred method for extinguishing class “A” fires is to remove the heat. Water is the most common agent, but others such as dry chemical, halon, halogenated agents and foam can be used effectively. A class “B” fire involves flammable liquid or gas.
Explanation:
Why do some elements that are classified as metals not look metallic?
Answer:
So, that students like us get confuse!!!
Explanation:
Find the density of a block with a length of 8.0 cm, a width of
4.0 cm, a height 2.0 cm, and a mass of 32 g. Would this block
float or sink in water?
Answer:
Density = 0.5 g/cm³Explanation:
Density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]
From the question
mass = 32g
To find the density we must first find the volume of the block
From the question the block is a cuboid
Volume of cuboid = length × width × height
length = 8 cm
width = 4 cm
height = 2 cm
Volume of block = 8 × 4 × 2 = 64 cm³
Substitute the values into the above formula and solve for the density
That's....
[tex]Density = \frac{32}{64} \\ = \frac{1}{2} [/tex]
We have the final answer as
Density = 0.5 g/cm³
The block will float because it's density is less than the density of water which is
1 g/cm³
Hope this helps you
Answer:
d= 0.5 g/ cm³
The block will float in water.
Explanation:
The density of an object can be found using the following formula:
[tex]d=\frac{m}{v}[/tex]
where [tex]m[/tex] is the mass and [tex]v[/tex] is the volume. We know the block has a mass of 32 grams. We don't know the volume, therefore we must calculate it.
Let's assume the block is a cube. The volume of a cube can be found using the following formula.
[tex]v=l*w*h[/tex]
The length is 8 cm, the width is 4 cm and the height is 2 cm.
[tex]l= 8 cm \\w= 4cm \\h= 2cm[/tex]
[tex]v= 8 cm * 4 cm * 2cm[/tex]
[tex]v=32 cm^2 * 2cm[/tex]
[tex]v= 64 cm^3[/tex]
Now we know the volume and can substitute it into the formula, along with the mass.
[tex]d=\frac{m}{v}[/tex]
[tex]m= 32 g\\v= 64 cm^3[/tex]
[tex]d=\frac{32 g}{64 cm^3}[/tex]
Divide 32 grams by 64 cubic centimeters.
[tex]d= 0.5 g/cm^3[/tex]
The density of the block is 0.5 grams per cubic centimeter. The density of water is 1.0 g/cm³. Any object with a density that is less than 1 will float in water. 0.5 is less than 1, so this object will float in water.
explain the reason for classifying the periodic table into blocks
Answer:
The long form of the periodic table divides the elements into four major blocks known as s, p, d, and f.
The period to which a given element belongs can easily be determined from its electron configuration. Based on electron configurations, the periodic table can be divided into blocks denoting which sublevel is in the process of being filled.
Hope it helps.
describe the energy inputs and outputs for the campfire. Use the law of conservation of energy to construct a valid qualitative equation that includes all the input and output energies involved.
Answer:
The essence including its particular subject is outlined in the following portion mostly on clarification.
Explanation:
The energy throughout the campfire comes from either the wood's latent chemical energy until it has been burned to steam up and launch up across the campfire. The electricity generation for something like a campfire seems to be in the context including its potential chemical energy which is contained throughout the firewood used only to inflame the situation.The energy output seems to be in the different types of heat energy radiating across the campfire, laser light generated off by the blaze, and perhaps a little number of electrical waves, registered throughout the firewood cracking whilst they combust throughout the blaze.and,
chemical energy ⇒ heat energy + light energy + sound energy