The best thing to do if a hypothesis was found to be wrong after conducting an investigation would be to write a new hypothesis and conduct new experiments to explore the matter.
HypothesisThe formulation of hypotheses is one of the key steps in the scientific method.
Hypotheses are usually tested using experiments and are usually accepted or rejected depending on the outcome of the experiments.
If a hypothesis is rejected, it does not mean that the entire subject is abandoned. Rather, new hypotheses may be formed and experiments conducted to further explore the subject.
More on hypotheses can be found here: https://brainly.com/question/23056080
Answer:
The best thing to do if a hypothesis was found to be wrong after conducting an investigation would be to write a new hypothesis and conduct new experiments to explore the matter.
Explanation:
This is all they ask
I need it.
If the temperature of the water were 0°C and the pressure was above 760 mm Hg, what phase would the water be in?
-Gas
-Liquid
or
-Solid
(Note pick one answer only)
Answer:
the answer is liquid.
Explanation:
At what temperature will 0.554 moles of helium gas occupy 11.30 liters at 1.95 atmospheres?
Also, what are the 4 gas laws, and what relationships do the represent?
Answer:
This is what we're given:
P (pressure), which is 1.95 atm
V(volume), which is 11.30 L.
n(number of moles), which is 0.554 moles of helium gas.
We have to find T, or temperature. To do this, we'll need to use the Ideal Gas Law, which is:
[tex]PV = nRT[/tex]
Rearranging this equation to get temperature on one side, we get:\\ [tex]T =\frac{PV}{nR}\\ \\
Pressure \: is \: in \: atm \: and \\ volume \: is \: in \: L . \: This \: tells \\ \: us \: that \: we'll \: need \: to \: \\ use \: the \: value \: of \: 0.08206 L atm/K \: mol \: for \: R \: the \: ideal \: gas \: constant.\\ \\ Plugging in all of the values, we can solve for temperature:
[tex]T =\frac{PV}{nR}\\ \\
T = (1.95 atm × 12.30 L) ÷
(0.654 mol × 0.0820575LatmK−1)
mol
[tex]T =\frac{PV}{nR} \\ \\
T =
\frac{ (1.95 atm × 12.30 L)}{(0.654 mol × 0.0820575LatmK−1)} [/tex]
[tex]T = 447 K [/tex]
4 gas laws, and relationships do they representBoyle’s Law (PV law)
a. Volume of a GIVEN MASS OF GAS (mass is fixed) is inversely proportional to the Absolute pressure of the gas at constant Temperature.
b. Absolute pressure means pressure that is measured relative to Vacuum. Vacuum = 0 pressure. Thus, absolute pressure is measured relative to absolute 0.
c. Another way : PV = Constant. Thus, if you measure the Pressure and Volume at 3 different times, then P1 V1 = P2 V2 = P3 V3. In order to keep the product as a constant, whenever Pressure increases, the Volume will decrease.
Charle’s Law (VT Law)
a. Volume of a GIVEN MASS OF GAS (mass is fixed) is directly proportional to the Absolute Temperature at constant pressure.
b. When you measure the Temperature of a body on a scale in which 0 corresponds to Absolute 0, then the measured temperature is Absolute Temperature. Put simply, this refers to the Kelvin scale.
c. Absolute 0 is the temperature at which objects are at their lowest possible energy (Since Temperature is a measurement of the Kinetic energy of the atoms).
Gay Lussac Law (PT Law)
a. Pressure of a GIVEN AMOUNT OF MASS (mass is fixed) at constant volume is directly proportional to the absolute Temperature (that is, Kelvin Temperature).
b. Another way : P / T = Constant. P1 / T1 = P2 / T2 = P3 / T3.
Avogadro’s law (Vn law)
a. All the above laws were talking about relationships at fixed mass. So we needed a law which would relate mass with other quantities. This is Avogadro’s law.
b. It is a very straight forward law, if the amount of gas in a Container increases (that is, if the amount of matter increases), then the Volume of the gas increases which is very straight forward.
c. Volume is directly proportional to n (number of moles) or V/n = Constant.
Considering the Ideal Gas Law, at 485.05 °K 0.554 moles of helium gas will occupy 11.30 liters at 1.95 atmospheres.
On the other side, the 4 gas laws are Gay Lussac's law, Boyle's law, Charles' Law and Avogadro's law.
Ideal Gas LawIdeal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P×V = n×R×T
where:
P is the gas pressure.V is the volume that occupies.T is its temperature.R is the ideal gas constant. The universal constant of ideal gases R has the same value for all gaseous substances. n is the number of moles of the gas.Temperature of heliumIn this case, you know:
P= 1.95 atmV= 11.30 LT= ?R=0.082 [tex]\frac{atm L}{mol K}[/tex]n= 0.554 molesReplacing in the Ideal Gas Law:
1.95 atm×11.30 L = 0.554 moles× 0.082 [tex]\frac{atm L}{mol K}[/tex]× T
Solving:
T= (1.95 atm×11.30 L) ÷ (0.554 moles× 0.082 [tex]\frac{atm L}{mol K}[/tex])
T= 485.05 K
Finally, at 485.05 °K 0.554 moles of helium gas will occupy 11.30 liters at 1.95 atmospheres.
Gay Lussac's lawGay Lussac's law states that the pressure of the gas is directly proportional to its temperature: when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, gas pressure decreases.
Boyle's lawBoyle's law says that volume is inversely proportional to pressure: if pressure increases, volume decreases; while if the pressure decreases, the volume increases.
Charles' LawCharles' Law that the volume is directly proportional to the temperature of the gas: if the temperature increases, the volume of the gas increases; while if the temperature of the gas decreases, the volume decreases.
Avogadro's lawAvogadro's law states that the volume is directly proportional to the amount of gas: if the amount of gas increases, the volume will increase, while if the amount of gas decreases, the volume will decrease.
SummaryIn summary, the 4 gas laws are Gay Lussac's law, Boyle's law, Charles' Law and Avogadro's law.
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https://brainly.com/question/4147359Which of these would be a good way to test to see if palladium is a metal?
A. Bite it
B. See if it blows up
C. See if it reacts with an acid
D. Test to see if it conducts electricity
Answer:
A is the answer
Explanation:
Just guessing.
Select the correct answer. Thomas has 235 grams of K2S in the chemistry lab. How many atoms of potassium (K) are in 235 grams of the compound? A. 2. 13 × 1023 B. 4. 26 × 1023 C. 2. 57 × 1024 D. 3. 37 × 1024 E. 7. 08 × 1024.
Atoms are the smallest division of the element. The potassium atoms present in the 235 gm of the compound is [tex]2.57 \times 10^{24}[/tex] atoms.
What is the number of atoms?Given,
Mass (m) of Potassium sulfide [tex](\rm K_{2}S)[/tex] = 235 gmMolar mass (M) of Potassium sulfide = 110.26 g/molCalculate the number of moles as:
[tex]\begin{aligned}\rm Moles (n) &= \dfrac{\rm mass}{\rm molar\;\rm mass}\\\\&= \dfrac{235}{110.26}\\\\&=2.13\;\rm mol\end{aligned}[/tex]
In the given compound [tex]\rm K_{2}S[/tex], there are two atoms of potassium and one atom of sulphur.
If, 1 mole = [tex]2 \times 6.022 \times 10^{23}[/tex] atoms of potassium
Then, 2.13 moles = X atoms
Solving for X:
[tex]2.13 \times 2 \times 6.022 \times 10^{23} = 2.57 \times 10^{24}[/tex]
Therefore, option c. [tex]2.57 \times 10^{24}[/tex] is correct.
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3 Cu + SHNO3 — 3 Cu(NO3)2 + 2 NO + 4 H20
In the above equation, how many grams of water can be made when 11.9 moles of HNO3 are
consumed?
Considering the reaction stoichiometry, the mass of H₂O that is produced when 11.9 moles of HNO₃ react is 107.1 grams.
Reaction stoichiometryThe balanced reaction is:
3 Cu + 8 HNO₃ → 3 Cu(NO₃)₂ + 2 NO + 4 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Cu: 3 molesHNO₃: 8 molesCu(NO₃)₂: 3 molesNO: 2 molesH₂O: 4 molesThe molar mass of the compounds present in the reaction is:
Cu: 63.54 g/moleHNO₃: 63 g/moleCu(NO₃)₂: 187.54 g/moleNO: 30 g/moleH₂O: 18 g/moleThen, by reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of mass of each compound participate in the reaction:
Cu: 3 moles ×63.54 g/mole= 190.62 grams
HNO₃: 8 moles ×63 g/mole= 504 grams
Cu(NO₃)₂: 3 moles ×187.54 g/mole= 562.62 grams
NO: 2 moles ×30 g/mole= 60 grams
H₂O: 4 moles ×18 g/mole= 72 grams
Mass of H₂O producedIt is possible to determine the the amount of mass of H₂O produced by a rule of three: if by stoichiometry 8 moles of HNO₃ produce 72 grams of H₂O, if 11.9 moles of HNO₃ react how much mass of H₂O will be formed?
[tex]mass of H_{2}O=\frac{11.9 moles of HNO_{3} x72 grams of H_{2}O}{8 moles of HNO_{3}}[/tex]
mass of H₂O= 107.1 grams
In summary, the mass of H₂O that is produced when 11.9 moles of HNO₃ react is 107.1 grams.
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In lab, a student observes an unknown substance dissolve in water and its mass remains the same. Which law is the student thinking of
The law which this student is thinking of is the law of conservation of mass (LOCOM).
What is LOCOM?LOCOM is an abbreviation for the law of conservation of mass and it states that mass is neither created nor destroyed in any chemical reaction.
This ultimately implies that, the mass of any substance in a balanced chemical equation or chemical reaction would remain the same at the end.
According to the law of conservation of mass (LOCOM), the mass of all the reacting chemical elements of any substance must be equal (remain the same) to the mass of the product formed during a chemical reaction.
Read more on LOCOM here: https://brainly.com/question/24783543
According to Explorer Victoria, what
two things should we strive to find in
climate change stories?
Answer:
The person above me is correct
Explanation:
have a wonderful day!
What is the empirical formula for ribose (C5H10O5)?
A. CH10O
B. C0.5HO0.5
C. CH2O
D. C5H2O5
E. C5H10O5
What is the empirical formula for ribose (C5H10O5)?
C. CH20
which is not true for combustion reactions?
a. they always occur in the presence of oxygen
b. they produce carbon dioxide and water
c. they usually require a lot of energy to form products
d. a candle burning is an example of one
Answer:
They usually require a lot of energy to form products
Explanation:
Energy may not be reasonable source.Oxygen and hydrocarbon is enough to produce the products .Petroleum products, Carbon and hydrocarbons are also necessary
what are consumers? what kind of animals are they.
Answer:
There are four types of consumers: omnivores, carnivores, herbivores and decomposers. Herbivores are living things that only eat plants to get the food and energy they need. Animals like whales, elephants, cows, pigs, rabbits, and horses are herbivores. Carnivores are living things that only eat meat.
Explanation:
What would have more thermal energy? the sun or a bad tub full of hot water? please explain your answer
The sun has more thermal energy than the bath tub full of hot water, because the sun has more heat than the bathe tub full of hot water.
What is thermal energy ?The energy present in a system that determines its temperature is referred to as thermal energy. Thermal energy flows as heat. Thermodynamics is a whole field of physics that studies how heat is transmitted across various systems and how work is performed in the process.
The object with the higher temperature has more thermal energy with two things have the same mass. A thermometer is used to determine temperature. Heat is the thermal energy that is transferred between things when their temperatures differ.
Undoubtedly, a colder item can possess more thermal energy than a warmer one. Here's one illustration, Thermal energy will be far more in a bathtub full of 100°F water than in a thimble full of 110°F water.
Thus, The sun has more thermal energy than the bath tub full of hot water.
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A chemist is studying the properties of a gas under various conditions. He observes that when the gas is at room temperature and low pressure, it behaves as an ideal gas. When the gas is cooled to 10 kelvin (–263ºC) and is placed under high pressure, however, it deviates significantly from an ideal gas. There are multiple reasons for this phenomenon. Check all of the correct reasons below. The ideal gas model assumes that gas particles experience no intermolecular attractions and these forces cause the gas to deviate from ideal behavior. At very low temperatures, gas particles move slowly. At very high pressures, gas particles are very close together. Gases placed under high pressure will undergo deposition, changing from a gas to a solid.
Gas is a state of matter that have loosely moving particles. The closeness of the gas and intermolecular forces deviates from the ideal equation.
What are the reasons for the deviation of gas?The gas consists of particles that may be too close resulting in lowering the speed that let intermolecular forces become significant at low-temperature and high pressure.
The intermolecular forces present in the gases differs from obeying the ideal gas conditions and contradicting the ideal gas rule of no collision and inter-molecular attraction with other gases.
Therefore, option A. intermolecular forces and option C. closeness of the particles are the reasons for the deviation.
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Answer:
answer in picture
Explanation:
25 mL of 0.1 M lactic acid (CH, CH(OH)COOH) is titrated with 0.1 M sodium hydroxide (NaOH). The titration curve is shown. What is the approximate pKa? At the pKa, what fraction of the carboxyl group will have been converted to COO-? Express your answer as a decimal, not a percent.
The pKa and the fraction of the carboxyl group is mathematically given as
a) pH= 3.2
b) 1/2 Carboxyl group will give COO_
The carboxyl group and pKaQuestion Parameters:
25 mL of 0.1 M lactic acid (CH, CH(OH)COOH) is titrated with 0.1 M sodium hydroxide (NaOH).
Generally the equation for the pH is mathematically given as
ph = pka + log [tex]\frac{[sodium lactate]}{[lactic acid]}[/tex]
Therefore
NaOH moles = 1/2 moles of acid then [sodium lactate]
Means
NaOH moles =[lactic acid]
Therefore
pH=pKa
Hence
Volume of NaOH = 12.5 ml
Therefore
pH = pka
pH= 3.2
b)
Generally at pKa =3.2, The 1/2 Carboxyl group will give COO_
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Look at the map and follow the paths of the Colorado, Gila, and Salt Rivers. Then, answer the following questions
1.What river has the most dams on it?
2.What are the bodies of water behind a dam called?
3.Name three dams on the Colorado River. HELP ME PLS!
How many particles are in 23 grams of carbon tetrafloride
Answer:
5.399772727e22 atoms/particles or 5.39 x 10^22 atoms/particles
Explanation:
so to convert you’re going to convert grams to moles and moles to atoms/particles:
grams to moles:
23g CF4 x 1 mol
———— = 0.26136 mol
88g (molar mass of CF4)
moles to atoms/particles:
[2.066 • 10^23 is avogadro's number and is always used to convert to atoms/particles]
0.26136 mol x 2.066 • 10^23
———————
1 mol
this gives you 5.399772727e22 atoms/particles
so 5.399772727e22 atoms/particles or 5.39 x 10^22 atoms/particles for scientific notation
hope this helps :)
Bromine has two naturally-occurring isotopes. 79Br has a mass of 78.9 amu and accounts for 50.3% of bromine atoms. If the atomic mass of bromine is 79.9 amu, what is the mass of an atom of the second bromine isotope?
A) 77.9 amu.
B) 80.0 amu.
C) 80.1 amu.
D) 80.9 amu.
E) 88.9 amu.
The mass of an atom of the second bromine isotope is 80.9amu
Calculation of Mass of an atomic isotope
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Now given that
Atomic mass of bromine = 79.9 amuPercent abundance of 1st isotope = 50.3%Atomic mass of 1st isotope = 78.9 amuPercent abundance of 2nd isotope = 100-50.3%=49.7%Atomic mass of 2nd isotope =?Plugging in values, we have that
79.9= (50.3×78.9)+(49.7× ?) /100
79.9x 100= (50.3×78.9)+(49.7× ?) /100
7990= 3968.7+(49.7x)
7990- 3968.7=49.7x
4021.3= 49.7x
x=4021.3/49.7
x=80.9amu
Therefore, the mass of an atom of the second bromine isotope is 80.9amu.
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Define melting, evaporation, freezing, sublimation and condensation.
Answer:
Melting- The process by which a substance changes from its solid state to its liquid state.
evaporation- turning liquid into vapor.
Freezing- The process by which a substance changes from its liquid state into its solid state.
condensation- water which collects as droplets on a cold surface when humid air is in contact with it
sublimation- a solid deposit of a substance which has sublimed.
Explanation:
which of these is a element
Answer:
its b i remember learning this
Explanation:
What is the attraction between molecules within a substance called? adhesion capillary action cohesion polarity.
Answer:
cohesion
Explanation:
just got it right
Answer:
Cohesion
Explanation:
"cohesion: the attraction between molecules within a substance; the tendency of the molecules of a substance to "stick together" or group together" (edge)
Select the correct answer.
Fraternal twins are formed when sperms fertilize two different eggs. What would you expect about the
twins' DNA and physical appearance?
They have similar DNA and they have identical physical appearances.
They have different DNA but exactly the same physical appearances.
They have similar DNA but environmental factors might cause changes in their physical
appearance.
They have different DNA and different physical appearance
Answer:
They have different DNA and different physical appearance
Explanation:
Because if the sperms fertilize two different eggs the DNA will be different too and if the sperms are different the physical appearance will be different also
The student needs 0.268 mol of zinc for a reaction. What mass of zinc in grams should the student obtain?
Which pair of elements are nonmetals and gases at room temperature and normal atmospheric pressure?.
The pair of elements which are non-metals and at the same time; gases at room temperature and normal atmospheric pressure are as follows:
N2, O2, He, Ar
What is an element?An element is a substance which cannot be split into simpler units by any ordinary process.
Some elements are metalsSome are non-metalsSome are gasesSome few examples of elements include:
Hydrogen
Helium
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
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(2 KClO3 (s) → 2 KCl (s) + 3 O2 (g) ) If 165 mL of oxygen is produced at 30.0 °C and 90.0 kPa, what mass of KClO3 was decomposed?
Taking into account the reaction stoichiometry and ideal gas law, 0.48144 grams of KClO₃ was decomposed.
Reaction stoichiometryIn first place, the balanced reaction is:
2 KClO₃ → 2 KCl + 3 O₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
KClO₃: 2 moles KCl: 2 moles O₂: 3 molesThe molar mass of the compounds is:
KClO₃: 122.45 g/mole KCl: 74.45 g/moleO₂: 32 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
KClO₃: 2 moles ×122.45 g/mole= 244.8 grams KCl: 2 moles ×74.45 g/mole= 148.9 gramsO₂: 3 moles ×32 g/mole= 96 gramsIdeal gas lawThe pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P×V = n×R×T
where:
P is the gas pressure.V is the volume that the gas occupies.T is the temperature of the gas.R is the ideal gas constant. The universal constant of ideal gases R has the same value for all gaseous substances. n is the number of moles of the gas. Number of O₂ produced.165 mL of oxygen is produced at 30.0 °C and 90.0 kPa. This is, you know:
P= 90 kPa= 0.888231 atm (being 101.325 kPa= 1 atm)V= 165 mL= 0.165 L (being 1000 mL= 1 L)n= ?R= 0.082 [tex]\frac{atmL}{molK}[/tex]T= 30 C= 303 K (being 0 C= 273 K)Replacing in the ideal gas law:
0.888231 atm× 0.165 L = n× 0.082 [tex]\frac{atmL}{molK}[/tex]× 303 K
Solving:
n= (0.888231 atm× 0.165 L)÷ (0.082 [tex]\frac{atmL}{molK}[/tex]× 303 K)
n= 0.0059 moles
Finally, 0.0059 moles of oxygen is produced at 30 °C and 90 kPa.
Mass of KClO₃ requiredThe following rule of three can be applied: If by stoichiometry of the reaction 3 moles of O₂ are produced by 244.8 grams of KClO₃, 0.0059 moles of O₂ are produced by how much mass of KClO₃?
[tex]mass of KClO_{3}= \frac{0.0059 moles of O_{2}x 244.8 grams of KClO_{3}}{3 moles of O_{2}}[/tex]
mass of KClO₃= 0.48144 grams
Finally, 0.48144 grams of KClO₃ was decomposed.
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Mrs. Sikora purchases chlorpheniramine over-the-counter for her allergies. Which side effect would Mrs. Sikora likely experience
Answer:
drowsiness
Explanation:
what is the formula for iron ii phosphate when dissociation
Answer: Fe3(PO4)2
Explanation:
If this helps give me brainliest please
When naming binary covalent compounds, the element listed first will be the one that is.
Answer:
Rule 1. The element with the lower group number is written first in the name; the element with the higher group number is written second in the name. Exception: when the compound contains oxygen and a halogen, the name of the halogen is the first word in the name.
Explanation:
When naming binary covalent compounds, the element listed first will be the one that is lower in group number.
What is covalent compound?Covalent compounds versus ionic compounds are the two groups into which chemical compounds are often divided. Ionic compounds are composed of atoms or molecules that have gained or lost electrons, causing them to become electrically charged.
Covalent or molecular compounds often emerge from the interaction of two nonmetals. By sharing electrons, the elements combine to create a compound, producing and electrically neutral molecule. When naming binary covalent compounds, the element listed first will be the one that is lower in group number.
Therefore, when naming binary covalent compounds, the element listed first will be the one that is lower in group number.
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Which answer is the right one
Answer:
Pressure and volume
5. A car travelled for 6 hours at a distance of 60 kilometers. What is the speed
of the car?
A. 10 km/h
B. 20 km/h
C. 30 km/h
D. 60 km/h
Answer:
A. 10 km/h
its the answer.......................................
HELP?? Read each statement and determine which characteristic each person is demonstrating. THE OPTIONS TO FILL IN THE "___" ARE, [Creative], [Curious], [Ethical], [Skeptical]
_____ Andrew asks questions about how the volcanoes in Hawaii were formed.
_____ Robyn sees a magazine for kids at the grocery store with an article about a new fossil discovery. So, she searches scientific journals that support the content of the article.
____ Maggie uses her knowledge of physics to create a simple machine for a science fair project.
____ Shaun is testing a new medication on animal subjects. He is sure to follow all guidelines for appropriate care and testing.
Answer:
1. curious
2. curious
3. creative
4. Ethical
Explanation:
I am not sure but I hope they are correct! :)
Answer:
Curious.)
Andrew asks questions about how the volcanoes in Hawaii were formed.
Skeptical.)
Robyn sees a magazine for kids at the grocery store with an article about a new fossil discovery. So, she searches scientific journals that support the content of the article.
Creative.)
Maggie uses her knowledge of physics to create a simple machine for a science fair project.
Ethical.)
Shaun is testing a new medication on animal subjects. He is sure to follow all guidelines for appropriate care and testing.
Explanation:
Have a great rest of your day
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