An educated guess which explains observations is called:  

a a law  
b an experiment
 c a hypothesis  
d a variable​

Answers

Answer 1
The answer is C. a hypothesis
Answer 2

Answer:

c. a hypothesis  is the correct answer

Explanation:


Related Questions

Only certified electricians are allowed to work on facility electrical system?

Answers

No that is incorrect definitely

what is the molecular formula of Ferric Oxide with criss-cross method ​

Answers

Answer: Fe2O3

Explanation: By applying crisscross method, the formula will be Fe2O3.

Consider the reaction below.
C₂H4(g) + H₂(g) → C₂H6(g)

Answers

Answer:

I don't see a question.

Explanation:

I do see a reaction in which tells us that the C2H4 has a double-bonded C.  The additrtion of H2 breaks this bond and provides the two bonding sites needed for the 2 new hydrogen atoms.

H2C=CH2 + H2 → H3C-CH3

classify the following into colloids, suspensions and true solution: soda water,chalk powder,milk,blood,ink,starch solution,sulphur powder in water,egg albumin.

Answers

Answer:

Amm is this right (if is it the right so mark me the brainliest pls)

Explanation:

Answer : Solutions- Brine, Soda water. Suspensions- Muddy river water, Chalk water mixture, Milk of magnesia, Smoke in air. Colloids- Milk, Ink, Blood, shaving cream.

Describe the characteristics that identify a sample of matter as being a substance.

Answers

Answer:

Any characteristic that can be measured, such as an object's density, color, mass, volume, length, malleability, melting point, hardness, odor, temperature, and more, are considered properties of matter.

Suppose you use bottles and balloons to run an experiment to measure the amount of metabolism by yeast. One of your bottles has black coffee and yeast, with a balloon sealing the top of the bottle. After 3 hours, you note that the balloon has not inflated at all. What is the most likely reason that it did not inflate

Answers

The yeast was not able to metabolize the sugar in black coffee and so, no carbon dioxide was produced.

What is the product of the action of glucose on yeast?

Yeast metabolizes sugar or glucose to produce alcohol and carbon dioxide.

The carbon dioxide produced is responsible for the raising action of yeast on dough and for the inflation of the balloon.

In the experiment, the possible reason why the balloon did not inflate is that the yeast was not able to metabolize the sugar in black coffee and so, no carbon dioxide was produced.

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1. 10.0 g of CaCO 3 ​ on heating gave 4.4 g of CO 2 ​ and 5.6 g of CaO. The observation is in agreement with the law of conservation of mass.

2. hydrogen and oxygen are combined to form two compounds the hydrogen content in one of the compound is 5.93 % and another is 11.2 % is this obey the law of multiple proportion.

3. On analysis it was found that the black oxide of Copper and red oxide of copper contains 80 and 89% of copper respectively Is this obeys the law of multiple proportion.

4.when 8.4 G of NaHco3 is added to the solution of Acetic Acid weighing 20 gram if it is observed that 4.4 gram of Co2 is released into the atmosphere and Residue is left Behind what is the mass of left Residue.​

Answers

Answer:

According to the law <br> Mass of reactants = mass of product, here <br> `underset(10 g)(CaCO_(3))rarr underset(4.4 g)(CO_(2))+underset(x)(CaO)` <br> Hence, x = 10 g - 4.4 g = 5.6 g <br> Which is mass of CaO.dIn the first compound <br> Hydrogen = 5.93 % <br> Oxygen = `(100-5.93)% = 94.07 %` <br> In the second compound <br> Hydrogen = 11.2 % <br> Oxygen `= (100-11.2)%=88.8%` <br> In the first compound the number of parts by mass of oxygen that combine with one part by mass of hydrogen `=(94.07)/(5.93)=15.86` parts ...(The ratio of Cu combining with fixed weight of oxygen in black and red oxide is 1 : 2 respectively. Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.) {Check something more in the above attachment!}Refer to the above attachment

Explanation:

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what is the wavelength of a microwave with a frequency of 2450 mhz

Answers

Answer:

See below

Explanation:

The way to calculate this

  speed of light =  wavelength * frequency

   3 x 10 ^8 m/s   =   wavelength * 2450000000 Hz

       wavelength = .12245 meters

                    = 1.2245 x 10^-1  Meters  

The wavelength of a microwave with a frequency of 2450 mhz is 1.2245 x 10⁻¹ meters.

What is wavelength?  

The wavelength is the time period or spatial period between the periodic wave and the distance between two waves. A microwave is a form of electromagnetic radiation.

The frequency of a microwave, f = 2450 MHz

We need to find the wavelength and the period of the microwaves

c = f λ

c = speed of light = 3 x 10 m/sec. 8 c = λf where λ = wavelength, f = frequency. Length

The relation between the wavelength and frequency is given by

The speed of light =  wavelength x frequency

3 x 10⁸ m/s   =   wavelength x 24500 Hz

Wavelength = .12245 meters

1.2245 x 10⁻¹  Meters  

Therefore, the wavelength of a microwave with a frequency of 2450 MHz is 1.2245 x 10⁻¹ meters.

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How many moles of hydrogen atoms are contained in one mole of[tex]C_{6}H_{12}[/tex]?

Answers

The number of moles of hydrogen atoms contained in 1 mole of c6h12 is 12.

What is hydrogen made of?

Hydrogen can be produced from various domestic resources such as fossil fuels, biomass, and the electrolysis of water by electricity. The environmental sustainability and energy efficiency of hydrogen depends on how hydrogen is produced.

Hydrogen is the simplest element. Each hydrogen atom has only one proton. Hydrogen is also the most abundant element in the universe. Stars like the Sun are mainly made of hydrogen. The sun is essentially a giant sphere of hydrogen and helium gas.

Some facts about hydrogen:

Hydrogen is the most abundant element on earth. Hydrogen is an alternative fuel with a very high energy content by weight.The fuel cell can be used to power multiple applications.

Fuel cells are a clean way to generate electricity.

Fuel cell vehicles are very similar to traditional gasoline vehicles

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What is periodicity?​

Answers

the quality of being periodic the tangency to record the intervals

the prediotic of the sun sports cycle

It is the year 2040, and you are a research scientist. The amount of sunlight that reaches the earth has been drastically reduced due to a major event like pollution, fires, or volcanoes. Farmers are asking you for help to save their failing crops.

Answers

hhfgbuugucviibygtvhgyvybubbiinubuvycyuj

calculate the number of moles in positive and negative ions in 1.75 moles of calcium fluoride quizlet

Answers

CaF₂ ⇒ Ca²⁺ + 2F⁻

1.75       1.75     3.5

When Earth receives energy from the Sun, ____. a. some energy is reflected back into space b. some is absorbed by the atmosphere c. some is absorbed by land and water on Earth's surface d. all of the above Please select the best answer from the choices provided A B C D

Answers

Answer:

D - all of the above

Explanation:

10.00 g of LiCl is dissolved in water to make 1.00 L of "Solution A". Then, 100 mL
of solution A were diluted to a volume of 500 mL of "Solution B". What is the
molarity of solution B? (Report your answer to four places past the decimal point.
Moodle is looking for a number only, no units.)

Answers

0.47 M is the molarity of solution B if 10.00 g of LiCl is dissolved in water to make 1.00 L of "Solution A".

Define the molarity of a solution.

Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.

[tex]Molality = \frac{Moles \;solute}{Solvent \;in \;kg}[/tex]

Moles of  LiCl

[tex]Moles = \frac{mass}{molar \;mass}[/tex]

[tex]Moles = \frac{10.00 g}{42.394 g/mol}[/tex]

Moles = 0.2358824362

[tex]Molality = \frac{0.2358824362}{0.5 L}[/tex]

Molarity = 0.4717648724 M =0.47 M

Hence, 0.47 M is the molarity of solution B.

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How many milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda? Show your work.

Answers

225 milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.

How to calculate volume?

The volume of a substance can be calculated using the following formula:

molarity = no of moles ÷ volume

no of moles of baking soda (NaHCO3) = mass ÷ molar mass

Molar mass of baking soda = 84.007g/mol

no of moles = 15g ÷ 84.007g/mol = 0.18mol

0.8 = 0.18/volume

volume = 0.23L equivalent to 225mL

Therefore, 225 milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.

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225 millilitres of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.

Define molarity of a solution.

Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.

[tex]Molality = \frac{Moles \;solute}{Volume of solution in litre}[/tex]

[tex]Moles of baking soda (NaHCO_3) =\frac{mass}{molar \;mass}[/tex]

Molar mass of baking soda = 84.007g/mol

[tex]Moles of baking soda (NaHCO_3) =\frac{15g}{84.007g/mol}[/tex]

[tex]Moles of baking soda (NaHCO_3) = 0.18mol[/tex]

Now, calculating volume with the molarity formula:

Molality = [tex]\frac{Moles \;solute}{Volume \;of \;solution \;in \;litre}[/tex]

0.8 = [tex]\frac{0.18 }{Volume \;of \;solution \;in \;litre}[/tex]

Volume = 0.23L equivalent to 225mL

Therefore, 225 milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.

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A syringe containing 35.0 mL of Xe gas at 298 K has a pressure of 0.980 atm. How many grams of Xe are in the syringe? Report your answer to the nearest 0.001 g

Answers

The mass of Xe present in the syringe given the data is 0.183 g

How to determine the mole of Xe Volume (V) = 35 mL = 35 / 1000 = 0.035 L Pressure (P) = 0.980 atm Temperature (T) = 298 KGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?

Using the ideal gas equation, we can obtain the mole of Xe as follow:

n = PV / RT

n = (0.98 × 0.035) / (0.0821 × 298)

n = 0.0014 mole

How to determine the mass of XeMole = 0.0014 moleMolar mass of Xe = 131 g/moleMass of Xe = ?

Mass = mole × molar mass

Mass of Xe = 0.0014 × 131

Mass of Xe = 0.183 g

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determine the enthalpy change when 7.08g of Ag is obtained. use the abbreviated form of the unit in your answer.
2AgBr(s) -> 2Ag(s) + Br2(l) deltaH = -220kJ

Answers

2AgBr(s) ⇒ 2Ag(s) + Br₂(l) ΔH = -220kJ ⇒ for 2 mol Ag

mol Ag = 7.08 : 108 g/mol = 0.065

the enthalpy change = 0.065/2 x -220 kJ = -7.15 kJ

Which element is most likely to have a high thermal conductivity

Answers

Copper has the highest thermal conductivity as compared to other metals in the periodic table.

What is thermal conductivity?

Thermal conductivity refers to the rate at which heat is transferred by conduction through a unit cross-section area of a material. When a temperature increases at one end it moves to the other end through conduction.

So we can conclude that Copper has the highest thermal conductivity as compared to other metals in the periodic table.

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Hydrogen reacts with an element to form a compound. which element would have the most valence electrons available to react with hydrogen?

Answers

Answer:

the element is oxygen

Explanation:

it will react to give H2O

Which of the following could have been formed by reacting iron with sulfur?
A. Iron oxide
B. Sulfuric iron
C. Iron sulfide
D. Sulfuric acid

Answers

Answer: C

Explanation:

iron sulfide.

Answer:

C. Iron sulfide

Explanation:

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What is the change in freezing
point, ATf, when the 0.195 m
aqueous solution of K2S dissolves
into 3 particles?

Answers

-1.09'C is the change in freezing point

“Freezing point depression” depends on the solvent and the molar concentration of the solute.

Sulfide is highly basic, consequently

K2S

completely and irreversibly hydrolyzes in water according to the following equation:

K2S+H2O→KOH+KSH

What is freezing?

Freezing, also known as solidification, is a phase transition where a liquid turns into a solid when its temperature is lowered below its freezing point.

the temperature at which a liquid solidifies specifically : the temperature at which the liquid and solid states of the substance are in equilibrium at atmospheric pressure : melting point the freezing point of water is 0° Celsius or 32° Fahrenheit.

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Answer:1.0881

Explanation:

2 attempts left check my work
be sure to answer all parts.
calculate the density of a solid substance if a cube measuring 2.72 cm on one side has a mass of 129 g.

Answers

Answer:

6.41 gm / cm^3

Explanation:

cube volume =    2.72 x 2.72 x 2.72 cm^3  = 20.124

Density =   mass / volume = 129 g / 20.124 cm^3 = 6.41 gm / cm^3

1. How does the Key change for a weak acid?
2. How would the images change for a weak acid solution of the same concentration? Draw the images and/or
describe with words.
3. Draw the images and/or describe with words a weak acid and a strong acid solution of the greater
concentration? Make any notes that might help you remember.
4. Write the chemical reactions for a weak acid and a strong acid.
5. Is there one type of representation that might be the best one for you to remember information about weak
and strong acids?
6. Make any notes that might help you remember how to compare/contrast the two types.

Answers

The weak acid will have fewer ions than the strong acid of similar concentration.

The chemical reactions for a weak acid and a strong acid is given below:

Strong acid: HA → H⁺ + A⁻Weak acid: HA ⇆ H⁺ + A⁻

What are strong and weak acids?

Strong acids are acids which dissociate completely in solutions. Examples of strong acids are hydrochloric acid and sulfuric acid.

Weak acids are acids which dissociate only partially in solutions. Examples of weak acids are carbonic acid and acetic acid.

Weak acids of a similar concentration to a strong acid have fewer hydrogen ions.

The equation of the dissociation of strong acids and weak acids are given below:

Strong acid: HA → H⁺ + A⁻Weak acid: HA ⇆ H⁺ + A⁻

In conclusion, weak acids produce few ions in solution while strong acids fully dissociate into ions in solution.

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Based on the electron configuration of the two
atoms, predict the ratio of metal cationic (+) atom
to nonmetal anionic (-) atom in the compound.
Magnesium 1s²2s²2p63s²
Sulfur 1s²2s²2p63s²3p4

Answers

A compound formed between Magnesium and Sulfur is MgS.

What is a cation?

Cations are positively-charged ions (atoms or groups of atoms that have more protons than electrons due to having lost one or more electrons).

Magnesium, Mg, is located in period 3, group 2 of the periodic table, and has two electrons on its outermost shell.

On the other hand, sulfur, S, is located in period 3, group 16 of the periodic table, and has six electrons on its outermost shell.

Chemical reactivity is governed by an atom's "desire" to have a stable electron configuration and to have eight electrons in its outermost shell to complete an octet.

In this case, magnesium can complete its octet by giving up those two valence electrons, becoming the magnesium cation.

[tex]Mg^{2+}[/tex], in the process.

Sulfur, which only needs two electrons to complete its octet, will pick up the two electrons coming from magnesium, becoming the sulfide anion,

[tex]S^{2−}[/tex], in the process.

The electrostatic force of attraction will then bring the magnesium cations and the sulfur anions together to form an ionic bond.

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What happens to the atomic radius when an electron is gained?
OA. The negative ionic radius is larger than the neutral atomic radius
B. The negative ionic radius is smaller than the neutral atomic radi
C. The negative ionic radius is the same size as the neutral atomic
radius.
D. The negative ionic radius does not follow a trend with the neutra
radius.

Answers

A. The negative ionic radius is larger than the neutral atomic radius.

which are not oxidative reaction?
(look at the image)​

Answers

Answer:

Cu²+ e ----> Cu+

This is not oxidation as it gain electron .

Oxidation reaction means addition of oxygen or removal of hydrogen

or in other words loss of electrons

Mg ----> Mg²+ + 2e

this is oxidation reaction as Mg loss 2e to become +2

Sn³+ -----> Sn4+ + 2e

this is oxidation reaction as it losses electrons

similarly other are also oxidation.

calculate the amount of glucose required to prepare 250g of 5% sugar solution​

Answers

Answer:

12.5g

Explanation:

1. Percentage of solution = 5.

2. Mass of solution = 250g.

3. = Mass of solute / 250 x 100.

4. = 5 x 250 / 100.

5. = 12.5g.

What volume did a helium-filled balloon have at 18.1 °C and 2.61 atm if its new volume was 59.9 mL at 1.92 atm and 12.5°C?
a. 44.9
b. 63.8
c.43.2
d. 83.0

Answers

Answer:

a.  V=44.9mL

Explanation:

For a gas undergoing all of these changes, it will be important to combine Boyle's Law and Charles' Law to form the following equation (if it isn't already known):

[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]

Where the Temperatures must be measured in Kelvin.

Recall that to convert Celsius to Kelvin, one must add 273 or use the equation [tex]T_C+273=T_K[/tex].

Thus, [tex]T_1=(18.1+273)[K]=291.1[K][/tex]  and [tex]T_2=(12.5+273)[K]=285.5[K][/tex]

To solve for the requested quantity, note that all of the other units match between beginning and end, so we substitute and solve:

[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]

[tex]\dfrac{(2.61[atm])V_1}{(291.1[K])}=\dfrac{(1.92[atm])(59.9[mL])}{(285.5[K])}[/tex]

[tex]\dfrac{(2.61[atm] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----})\bold{V_1}}{291.1[K] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----}}*\dfrac{291.1[K] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----}}{2.61[atm]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----}}=\dfrac{(1.92[atm]\!\!\!\!\!\!\!\!\!\!\!{--})(59.9[mL])}{285.5[K\!\!\!\!\!{-}]}*\dfrac{291.1[K\!\!\!\!\!{-}]}{2.61[atm]\!\!\!\!\!\!\!\!\!\!\!{--}}[/tex]

[tex]V_1=44.928677576[mL][/tex]

Accounting for significant digits, [tex]V_1=44.9[mL][/tex]

Rank the gases Ar, N2, CH4, and C₂H6 in order of increasing density at STP.​

Answers

Rank the gases Ar, N2, CH4, and C2H6 in order of increasing density at STP.

ans : CH4

A student spilled a bottle of ammonia in one corner of the laboratory. Soon the whole laboratory was felled with pungent irritating small. The students immediately opened the windows and doors and switched on the exhaust fans. After sometime, students got relief. Explain what did actually happen?​

Answers

Answer: Initially when the student spilled the bottle of ammonia the ammonia gas particles diffused with the particles of air in the room. We know that the rate of diffusion of gases is very high. So the entire room filled up with the pungent smell of ammonia.

When he opened the doors and windows and switched on the exhaust fan, the air from the room along with the ammonia gas diffused with the air outside the room.Moreover, outside air entered into the room so the concentration of ammonia gas in the room air reduced.Due to these reasons the student got relief.

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You got 88.75 for the first quiz, 85.5, 90.5, and 87.25 in the second, third and fourth quizzes, respectively. What is your average in the four quizzes this quarter? A. 86.5 B. 88 C. 89.5 D. 90 26. Amberich put P580.00 into a savings account for one year. The rate of interest on the account was 6.5%. How much was the interest for one year in pesos and centavos? A. P67.70 B. P37.70 C. P57.70 D. P17.70 24. This week , Cristina eamed P594.65 from selling burgers for 35 days . How much he will earn in 5 days ? A. P84.95 B. P94.95 C. P104.95 D. P114.95 25. You have four quizzes in your math subject in a quarter . You got 88.75 for the first quiz , 85.5 , 90.5 , and 87.25 in the second , third and fourth quizzes , respectively . What is your average in the four quizzes this quarter ? A. 86.5 B. 88 C. 89.5 D. 90 26. Amberich put P580.00 into a savings account for one year . The rate of interest on the account was 6.5 % . How much was the interest for one year in pesos and centavos ? A. 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