Answer:
In an experiment in which blood pressure medication is tested, one group is given the blood pressure medication while the control group is given a placebo pill.
In a test of anxiety treatment, one group attends individual therapy sessions and receives a new medication. The control group receives only an inert pill.
A treatment for drug addiction is being tested. A group of meth addicts are given the treatment while the control group is given the placebo.
Researchers are testing the effectiveness of a drug intended to reduce symptoms of Crohn's disease. Many sufferers of Crohn's disease are recruited for the effort and the group that receives the placebo is the control group.
A treatment for hair loss in men is being tested. Men of the same age range are gathered. One group receives an application with the active ingredient while the control group receives an application that appears the same but does not have the active ingredient in it.
hope this helped you
HELP! Ethanol has a density of 0.8 g/cm3. a. What is the mass of 225 cm3 of ethanol? b. What is the volume of 75.0 g of ethanol?
Answer:
The correct answers are:
a) 180 g
b) 93.7 cm³
Explanation:
The density of a substance is the mass of the substance per unit of volume. So, it is calculated as follows:
density= mass/volume
From the data provided in the problem:
density = 0.8 g/cm³
a) Given: volume= 225 cm³
mass= density x volume = 0.8 g/cm³ x 225 cm³ = 180 g
b) Given: mass= 75.0 g
volume = mass/density = 75.0 g/(0.8 g/cm³)= 93.75 cm³≅ 93.7 cm³
Taking into account the definition of density:
the mass of 225 cm³ of ethanol is 180 g.the volume of 75.0 g of ethanol is 93.75 cm³.Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume} [/tex]
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Mass of 225 cm³ of ethanolIn this case, you know that:
Density= 0.8 [tex]\frac{g}{cm^{3} } [/tex]Volume= 225 cm³Replacing in the definition of density:
[tex]0.8 \frac{g}{cm^{3} } =\frac{mass}{225 cm^{3} } [/tex]
Solving:
mass= 0.8 [tex]\frac{g}{cm^{3} } [/tex] ×225 cm³
mass= 180 g
In summary, the mass of 225 cm³ of ethanol is 180 g.
Volume of 75.0 g of ethanolIn this case, you know that:
Density= 0.8 [tex]\frac{g}{cm^{3} } [/tex]mass= 75 gReplacing in the definition of density:
[tex]0.8 \frac{g}{cm^{3} } =\frac{75 g}{volume} [/tex]
Solving:
0.8 [tex]\frac{g}{cm^{3} } [/tex] ×volume= 75 g
volume= 75 g÷ 0.8 [tex]\frac{g}{cm^{3} } [/tex]
volume= 93.75 cm³
Finally, the volume of 75.0 g of ethanol is 93.75 cm³.
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what would be the best way to take water out of your coffee
How do we know atoms exist if we can’t see them?
Answer:
Explanation:
Because it's in your hands and there so small that a scientist would need a full scan from the body
3. How many protons do the following have?
Calcium
Gold
Copper
Iron
Answer:
calcium=20
gold=79
copper=29
iron=26
Explanation:
. Identify each of the following statements as being most similar to a hypothesis, a law, or a theory. Explain your reasoning.
(a) Falling barometric pressure precedes the onset of bad weather.
(b) All life on earth has evolved from a common, primitive organism through the process of natural selection.
(c) My truck’s gas mileage has dropped significantly, probably because it’s due for a tune-up.
(a). law (states a consistently observed phenomenon, can be used for prediction); (b). theory (a widely accepted explanation of the behavior of matter); (c). hypothesis (a tentative explanation, can be investigated by experimentation)
What is law, hypothesis and theory ?A law is defined as the verified statement that will always be true for the specified conditions.A hypothesis is defined as the generalized statement that is not based upon any verification or test. Basically, a hypothesis is a guess that we have to verify through test or experimentation.A theory is defined as an in-depth information about a verified fact or observed phenomenon.Learn more about law here ;
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An acetaminophen suspension for infants contains 80 mg/0.80 mL suspension. The recommended dose is 15 mg/ kg body weight. How many mL of th is suspension should be given to an in fant weighing 14 lb? (Assume two significant figures.)
Answer:
the answer is 35mg and 58ml
the statue of liberty in new york city is approximately 305 feet tall. How many US dimes would be in a stack of the same height? Each dime us 1.35 mm thick
Answer:
It takes 62863 dimes to equal the height of the Statue of Liberty.
Explanation:
If the Statue of Liberty is 305 ft tall and a coin is 1.35mm thick, how many coins will it take to equal the height of the statue?
Convert 305 ft to mm:
1 ft = 30.48 cm
305 ft = 9296.4 cm
92 964 mm
Now, if a dime is 1.35 mm thick, how many dimes will it take to get to 92 964 mm?
1 dime = 1.35mm
X dimes = 92964 mm
X coins = 92964 / 1.35
X = 62863 dimes
The weight of a cup with water is 2.58 kg the weight of the empty cup is 1.5 kg considering significant figures what is weight of the water
Answer:
The correct answer is 1.1 kg
Explanation:
From the data provided:
Weight (cup + water)= 2.58 kg
Weght (cup) = 1.50 kg
Thus, we simply calculate the difference between the full cup and the empty cup to obtain the net weight of water:
Weight (water) = Weight (cup + water) - Weght (cup)
= 2.58 kg - 1.50 kg
= 1.08 kg ≅ 1.1 kg
Answer: chemistry f sucks
Explanation:
bc it's f stupid
28. Analyzing Results A pure white, solid material that
looks like table salt releases gas when heated
under certain conditions. There is no change in
the
appearance of the solid, but the reactivity of
the material changes.
a. Did a chemical or physical change occur? How do
you know?
b. Was the original material an element or
a compound?
Answer:
a :Chemical b : compound
Explanation:
a : it had to be a chemical change because it says "There is no change in
the appearance of the solid, but the reactivity of the material changes.
b : well it would be a compound because it would have to be to make a reaction
There is no change is the appearance of the solid, but the reactivity of the material changes. In case of question a :Chemical changes occur and in case of question b : The original material is compound.
What are the properties of a compound ?A compound is defined as the material that is composed up of two or more elements by chemically combined with each other in a fixed proportion by their mass.
Examples are Water, Sodium Chloride, Ammonium Chloride etc; They have a fixed melting and boiling points, a compound can be changed in chemical reaction and hence the components are mixed in a fixed proportion.
Two primary types of compounds are covalent and ionic compounds as it is bonded by covalent and ionic bond, the formation of covalent bond occur between two nonmetals, like water or methane. These molecules are neutral and weak.
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Which describes density? amount of volume for a given object ability of an object to take up space amount of mass in a given volume ability of an object to float in water
amount of mass in a given volume
Amount of mass in a given volume perfect describes the meaning of density. Hence option C is correct.
What is density?Density is the term used to describe the relation between the mass of the body and their volume. Density is a property that can be used to identify substances. Each substance has a unique density.
Example: wood ball density is less as compared to metal ball because wood ball is less than metal ball.
It describes how much matter is packed into a certain volume.
D = M/V
M =Mass (gram); V = Volume (ml or cm3); D = Density (gram/cm3)
Amount of mass in a given volume perfect describes the meaning of density. Hence option C is correct.
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What is wind?
(1 Point)
air that moves upward
air that moves downward
air that moves from high pressure to low pressure
air that moves from low pressure to high pressure
Answer:
air that moves from high pressure to low pressure
What is scientific notation
scientific notation is a mathematical way to turn large of small numbers into a simpler form.
ex. 9000000000 is 9*10^9 in scientific notation
ex. 0.000000009 is 9*10^-9 in scientific notation
Uun element full name
Answer: Darmstadtium
Hope that helped
Answer:
Ununnilium
Explanation:
Uun on the table of elements is Ununnilium.
Jim went for a 3.75 hour run. How many minutes did he run?
what is this can any body answer
PLEASE HELP ME :( It’s urgent!!!!!
Answer:
C and D
Explanation:
In the first table, both element particles have more electrons than protons which is unusual and indicates they have a negative charge. Furthermore both numbers add up to full electron shells (2,8 and 2,8,8) meaning they are ions (charged particles formed to gain full valence shells and become stable), so it is C for the first question, negative ions.
As for the second one, isotopes like versions of the same element except with different numbers of neutrons, so they are still the same element but have different mass. As shown here the numbers indicate the number of neutrons therefore it is D, 3 more neutrons and no more electrons.
Hope this helped!
An Olympic swimming pool is 50 meters long. You swim from one end to the other four times.How many meters do you swim?
Answer:
200 meters
Explanation:
if u swim for each end 4 times, and its 50 meters long, 50 x 4 = 200 meters
A 253 g block of wood has the following dimensions: Length 15.24 cm Width 6.64 cm Height 3.56 cm What is the density of the wooden block?
Answer:
0.7 g/cm³
Explanation:
hey there,
< The formula for density is [tex]p = \frac{m}{v}[/tex] where m = mass, v = volume, and p = density. An easy way to remember the formula is density equals love. I found this easy to remember because p = ♡ and when you think about it, if you split the heart in half through the middle like a fraction, it will make [tex]\frac{m}{v}[/tex] (if you don't understand what I'm saying, try writing it out and you will be able to see what I'm talking about!)
We already know that the block is 253 g so the mass is 253 g.
To find the volume, always multiply the 3 values width, length, and height whenever you are trying to find the volume of a block.
15.24 cm x 6.64 cm x 3.56 cm = 360.25 cm³
Now plug it into the formula.[tex]p = \frac{m}{v}=\frac{253}{360.25} = 0.7 g/cm[/tex]³ >
Hope this helped! Feel free to ask anything else.
Density of a substance is its mass divided by volume. Volume of the cube is calculated to 360.24 cm³ and thus the density of the cube is 0.7023 g/cm³.
What is density?Density of a substance is the measure of its mass per volume. Thus mathematically it is the ratio of mass to the volume of th substance. Density of a substance depends on the bond type, mass, volume, temperature and pressure.
The ratio of density of a substance to the density of water is called specific gravity. If the specific gravity is greater than one the body will sink in water and if it is less than one it will float on water.
The mass of the block is given 253 g and the volume can be calculated from the product of length,breadth and height.
Volume = 15.24 cm × 6.64 cm × 3.56 cm
= 360.24 cm³.
Density = mass/volume
= 253 g/ 360.24 cm³
= 0.7023 g/cm³
Hence, the density of the block is 0.7023 g/cm³.
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Which of the following statements describe P-waves? Select the two correct answers.
A. They are the first waves detected after an earthquake.
B. They are the most destructive earthquake waves.
C. They alternately compress and pull apart the partides in matter.
D. They can only travel through the solid rock inside Earth.
Answer: C- they alternately compress and pull apart the particles in matter
A -they ate the first waves detected after and earthquake
Explanation:
Answer:
A&C
Explanation:
APEEXX
HELP PLEASE ASAP I need a good explanation
Answer:
B
Explanation:
Hellium is a gas...
Solids are particles that are packed together
liquids are particles that are together but conforme to their container
gas have space between them and conform to their holder
A silver coin with a mass of 14.1g has a density of 10.5 grams
What is the volume of the coin in cm??
cm
Answer:
1.34 cubic centimeter
Explanation:
v = m/d
A student needs exactly 1 gram of baking powder to conduct an experiment. The balance reads 0.37 grams. How
much more baking powder does the student need?
A. 50 grams
B. 63 grams
C. 75 grams
D. 36 grams
Answer:
B
Explanation:
If the student needs one gram but so far only has 0.37 grams, then the amount they need is the difference between what they need and how much they already have. 1-0.37=0.63 grams.
...which isn't actually an option because none of them have decimal points but I would say it is B anyway because it is the equivalent ratio and maybe there was a typo.
Hope this helped!
Answer:
The answer is B :)
Explanation:
Can skmebodynheop me with this it’s science.
Answer:
v=50km/hr
Explanation:
Given:
s= 300km
t= 6 hours
Required:
v=?
Formula:
v=s/t
Solution:
v=s/t
v=300km/6h
v=50km/hr
Hope this helps ;) ❤❤❤
What is the difference between a theory and a law in science
explain why the following statement is false: “if a theory is accepted for a long time, it eventually becomes a law.” include specific details about both theories and laws in your explanation.
Explanation:
hope this will help you
what are electrode potential
Answer:
Electrode potential is the electromotive force to the galvanic cell built standard.
Explanation:
Electrode potential is the convention electrode is the standard hydrogen electrode to the value zero potential.
Electrode potential is the origin to the developed in that interface between the electrode and electrolyte.Electrode potential is the interface due to the transfer of across the specific of molecules to the electrode potential.Electrode potential that working potential non zero reaction net current the working electrode potential.Electrode potential is that performed extrapolation of that measured to that values set that standard.Electrode potential under the depends on the nature of that contacting electrode reactions to the interface.Electrode with hydrogen is that ideal solution is zero potential to the all temperature to standard formation.Electrode potential to the working electrode, counter electrode and reference electrode that using three setup electrode.Electrode potential are performed the positive of that connected to that working electrode terminal to reference electrode.Answer:
In electrochemistry, electrode potential is the electromotive force of a galvanic cell built from a standard reference electrode and another electrode to be characterized.
What problem did the development of the metric system solve?
Answer:
The problems solved by the metric system includes, the eradication of fraud prevalent by the use of the approximately 800 units that were defined in 250 thousand ways due to the difference of the associated quantity to the units in different towns
The development of the metric system also solved the issues scientist had with working with the medieval system which were mainly national and regional systems that hindered scientific communication across regions
Explanation:
Which set of atoms are isotopes?
A. 16^ 8X and 16^ 6X
B. 16^ 8X and 17^ 8X
C. 12^ 6X and 14^ 7X
D. 6^ 26X and 26^ 6X
Answer:
Option B.
Explanation:
Isotopy is a phenomenon where by two or more atoms have the same atomic number (proton) but different mass number due to the difference in neutron present in the atoms. The atoms that exhibit Isotopy are isotopes.
With the above information, we can obtain the right answer to the question given above as follow:
For option A:
Isotope >> atomic no >> Mass no
16 8X >>> 8 >>>>>>>>> 16
16 6X >>> 6 >>>>>>>>> 16
Since they have the different atomic number, they are not isotope.
For option B:
Isotope >> atomic no >> Mass no
16 8X >>> 8 >>>>>>>>> 16
17 8X >>> 8 >>>>>>>>> 17
Since they have the same atomic number but different mass number, they are isotope.
For option C:
Isotope >> atomic no >> Mass no
12 6X >>> 6 >>>>>>>>> 12
14 7X >>> 7 >>>>>>>>> 14
Since they have different atomic number, they are not isotope.
For option D:
Isotope >> atomic no >> Mass no
6 26X >> 26 >>>>>>>>> 6
26 6X >>> 6 >>>>>>>>> 26
Since they have different atomic number, they are not isotope.
From the above illustration, only option B contains isotopes because the atoms have the same atomic number but different mass number
how can the existence of atoms help to explain the law of define proportions .
Answer:
Atoms of same element can combine in more than one ratio to form two or more compounds. Atoms are the smallest unit of matter that can take part in a chemical reaction. The law of definite proportions states that a chemical compound always contains exactly the same proportion of elements by mass.
Explanation:
Hope this helps :)
What products are formed when a hydrocarbon combusts?
A. Hydrogen and oxygen
B. Carbon dioxide and water
C. Carbon dioxide and hydrogen
D. Water and hydrogen
Answer:
b
Explanation:
The products are formed when a hydrocarbon combusts are carbon dioxide and water and the correct option is option B.
Combustion is a chemical reaction that occurs when a fuel combines with an oxidizing agent, typically oxygen, resulting in the release of heat and the formation of products. It is an exothermic reaction, meaning it releases energy in the form of heat and light.
During combustion, the fuel undergoes rapid oxidation, breaking its chemical bonds and forming new bonds with oxygen. Common examples of combustion include burning of wood, gasoline, natural gas, and other hydrocarbon fuels.
The reaction is often accompanied by the production of flames and the release of carbon dioxide and water vapor.
Thus, the ideal selection is option B.
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