Answer:
Fingerprints are determined by your genetic makeup.
Explanation:
Despite how much you attempt to remove them, they will grow back because of your DNA.
What is a volume. in your own words but be more detailed about what you say.
Answer:
volume is the amount of space in a certain object
why is water regarded as a universal solvent
Answer:
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Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid. This is important to every living thing on earth. It means that wherever water goes, either through the ground or through our bodies, it takes along valuable chemicals, minerals, and nutrients.
It is water's chemical composition and physical attributes that make it such an excellent solvent. Water molecules have a polar arrangement of the oxygen and hydrogen atoms—one side (hydrogen) has a positive electrical charge and the other side (oxygen) had a negative charge. This allows the water molecule to become attracted to many other different types of molecules. Water can become so heavily attracted to a different molecule, like salt (NaCl), that it can disrupt the attractive forces that hold the sodium and chloride in the salt molecule together and, thus, dissolve it.
What is your hypothesis (or hypotheses) for this experiment? (this is for the thermal energy transfer)
Answer:
Hypothesis is a statement of expectation or prediction that will be tested by research
According to collision theory, which of the following statements explain why an increase in temperature increases the rate of a chemical reaction? (Select all that apply.)
Answer:
The reactant particles have a greater average kinetic energy.
A smaller fraction of the reactant particles have energy greater than the Ea.
Atoms that have become negatively charged by gaining extra electrons are called
Answer:
CATION
Explanation:
If an atom has an equal number of protons and electrons, its net charge is 0. If it gains an extra electron, it becomes negatively charged and is known as an anion. If it loses an electron, it becomes positively charged and is known as a cation.
The decomposition of water into hydrogen gas Hy and oxygen gas Oz can be modeled by the balanced chemical equation
A)
H2 + 02 - H20
B)
H20 - H2 + O2
C) 2H2 + 02 - 2H20
D)
2H20 - 2H2 + O2
Answer:
D. ) 2H2O - 2H2 + O2
Give an example of Carbon atoms getting into the biosphere:
Answer:
Carbon in the biosphere
Explanation:
Carbon is found in the biosphere stored in plants and trees. Plants use carbon dioxide from the atmosphere to make the building blocks of food during photosynthesis. Carbon is found in the hydrosphere dissolved in ocean water and lakes. Carbon is used by many organisms to produce shells.
The fastest train in the world can travel 1,500 kilometers in 3 hours. What is its speed?
Heat is transferred at a rate of 2 kW from a hot reservoir at 825 K to a cold reservoir at 300 K. Calculate the rate at which the entropy of the two reservoirs changes. (Round the final answer to six decimal places.) The rate at which the entropy of the two reservoirs changes is 00424 kW/K.
Answer:
0.004243 KW/K.
Explanation:
From the question given above, the following data were obtained:
Heat transfered (Q) = 2 KW
Temperature of hot reservoir (Tₕ) = 825 K
Temperature of cold reservoir (T꜀) = 300 K
Next, we shall determine the entropy of both reservoir. This can be obtained as follow:
For hot reservoir:
Heat transfered (Q) = 2 KW
Temperature of hot reservoir (Tₕ) = 825 K
Entropy of hot reservoir (Sₕ) =?
Sₕ = Q/Tₕ
Sₕ = 2/825
Sₕ = 0.002424 KW/K
For cold reservoir:
Heat transfered (Q) = 2 KW
Temperature of cold reservoir (T꜀) = 300 K
Entropy of cold reservoir (S꜀) =?
S꜀ = Q/T꜀
S꜀ = 2/300
S꜀ = 0.006667 KW/K
Finally, we shall determine the change in the entropy of the two reservoirs. This can be obtained as follow:
Entropy of hot reservoir (Sₕ) = 0.002424 KW/K
Entropy of cold reservoir (S꜀) = 0.006667 KW/K
Change in entropy (ΔS) =?
ΔS = S꜀ – Sₕ
ΔS = 0.006667 – 0.002424
ΔS = 0.004243 KW/K.
A cylinder is filled with 10.0 L of gas and a piston is put into it. The initial pressure of the gas is measured to be 273. kPa.
The piston is now pulled up, expanding the gas, until the gas has a final volume of 50.0 L. Calculate the final pressure of the gas. Be sure your answer has the
correct number of significant digits.
P2 = 54.6 kPa
Explanation:
Given:
V1 = 10.0 L. V2 = 50.0 L
P1 = 273 kPa. P2 = ?
We can use Boyle's law to solve this problem.
P1V1 = P2V2
Solving for P2,
P2 = (V1/V2)P1
= (10.0 L/50.0 L)(273 kPa)
= 54.6 kPa
Calculate the amount of heat energy is needed to raise the temperature of 5.00 grams of lead from 25.0 to 35.0 degrees Celsius, if the specific heat capacity of lead is 0.129 J/g/C.
Answer: 6.45 Joules
Explanation: I just did it
1. How do scientific investigations begin?
conclusion
inquiry
testing
hypothesis
Answer:
Hypothesis is the answer
What is the molar mass of Fe(NO3)2?
Answer:
Explanation:
179.8548 g/mol
The total mass of all the atoms that make up a mole of a specific molecule, measured in grams, is known as the molar mass or molecular weight. Here the molar mass of Fe(NO₃)₂ is 179.87 g/mol.
One mole of any substance has a mass known as a molar mass. An amount that has a mass equal to its atomic or molecular mass in grams is referred to as a mole of any species (atoms, molecules, ions, or particles). The letter "M" stands for molar mass.
In other terms, the molar mass is the sum of the masses of all the atoms that make up a mole of a specific molecule, expressed in grams.
Here the molar mass of Fe(NO₃)₂ is :
Fe(NO₃)₂ = (1 x 55.85 g) + (2 x 14.01 g) +(6 x 16.00 g)= 179.87 g/mol
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Name the following alkyne:
A. propane
B. propene
C. propyne
D. methyne
The name of the alkyne which is given in the question with structure is propyne as in that 3 carbon atoms are present.
What are alkynes?Alkynes are those hydrocarbons in which triple bond is present between two adjacent carbon atoms.
In the given structure one triple bond is present between first two carbon atoms and then with this a single bonded carbon atom is also attached. As in the structure total three carbon atoms are present so prefix shoul be 'prop' and as this is an alkyne then name should be propyne.
Propane is wrong because it is used with single bonded hydrocarbons.Propene is also wrong as it is used with double bonded hydrocarbons.Methyne is also wrong as it is not a word that make any sesne.Hence name of compound is propyne.
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Propyne is the chemical name for the given alkyne. Therefore, the correct option is option C.
A triple bond exists between the carbon atoms in alkynes, a group of hydrocarbon molecules. They are given names based on the IUPAC (International Union of Pure and Applied Chemistry) guidelines for systematic nomenclature. Alkyne nomenclature's primary objective is to provide each compound a precise and distinctive name that accurately captures its structure. Based on the quantity of carbon atoms, the placement of triple bonds, and the presence of functional groups, alkyne compounds are named systematically.
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Given the reaction at equilibrium : H 2 (g)+I 2 (g)+53.0kj <-> 2Hl(g) The equilibrium will shift to the right if there's an increase in
We can see that heat is added on the left side of the reaction, which means that the reaction required heat to take place and is endothermic
because the reaction is endothermic, (absorbs heat to proceed), more heat will shift it towards the product side
because there is an equal number of gaseous moles on both the sides, a change in pressure or volume won't affect the equilibrium
How do you balance these equations?
Answer:
1Al₄C₃ + 12H₂O → 3CH₄ + 4Al(OH)₃
Explanation:
SOLUTION :-
Balance it by using 'hit & trial' method , and you'll get the answer :-
1Al₄C₃ + 12H₂O → 3CH₄ + 4Al(OH)₃
VERIFICATION :-
In reactant side of equation :-
Number of atoms in Al = 1×4 = 4Number of atoms in C = 1×3 = 3Number of atoms in H = 12×2 = 24Number of atoms in O = 12×1 = 12In product side of equation :-
Number of atoms in C = 3×1 = 3Number of atoms in H = (3×4) + 4(1×3) = 24Number of atoms in Al = 4×1 = 4Number of atoms in O = 4(1×3) = 12Number of atoms of each element is equal in both reactant & product side of equation. Hence , the equation is balanced.
X rays are used for
tracking storms.
killing bacteria.
screening luggage at airports.
two of the above
A gas occupies 4.31 liters at a pressure of 150 mm Hg. Determine the volume if the pressure is increased to 725 mm Hg.
Answer:
0.89 L
Explanation:
Applying,
Boyle's Law,
PV = P'V'..................... Equation 1
P represent initial pressure, V represent initial volume, P' represent final pressure, V' represent final volume
Make V' the subject of the equation
V' = PV/P'.............. Equation 2
From the question,
Given: P = 150 mm Hg, V = 4.31 liters, P' = 725 mm Hg
Substitute these values into equation 2
V' = (150×4.31)/725
V' = 0.89 L
how to calculate the mass percent of hydrogen
Answer:
divide the mass of element in 1 mole of the compound by the compound's molar mass and multiply the answer by 100.
Explanation:
take the molar mass of hydrogen in the water molecule, divide by the total molar mass of water, and multiply by 100.
does it help?
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A sample of an unknown metal has a mass of 120.4 g. As the sample cools from 90.5°C to 25.7°C, it releases 7020 J of energy. Usinf the chart below, what is the identity of the metal in the sample? Hint Calculate specific heat first Substance Specific Heat Water (liquid) 4.184 J/g °C 0.899 J/g °C 0.803 J/g °C 0.449 J/g °C a) Aluminum ) b) Granite Oc) Water d) Iron
Answer:
Explanation:
sheesh i wouldn’t know
1. What fraction of a sample of N-16 remains undecayed after 42.78 seconds?
Answer:
1/64
Explanation:
From the question given above, the following data were obtained:
Time (t) = 42.78 s
Fraction of N–16 remaining (N/N₀) =?
NOTE:
N₀ => is the original amount.
N => is the amount remaining.
Next, we shall determine the number of half-lives that has elapsed. This can be obtained as follow:
Time (t) = 42.78 s
Half-life (t½) of N–16 = 7.1 s
Number of half-lives (n) =?
n = t / t½
n = 42.78 / 7.1
n = 6
Thus, 6 half-lives has elapsed.
Finally, we shall determine the fraction of N–16 that remains undecayed. This can be obtained as follow:
Number of half-lives (n) = 6
Fraction of N–16 remaining (N/N₀) =?
N = 1/2ⁿ × N₀
N = 1/2⁶ × N₀
N = 1/64 × N₀
Divide both side by N₀
N/N₀ = 1/64
Therefore, 1/64 of the sample remains undecayed.
If an object is on top of a hill or in a position raised above the ground, it must have __________.
Answer:
The force applied to the object is an external force, from outside the system. When it does positive work it increases the gravitational potential energy of the system. Because gravitational potential energy depends on relative position, we need a reference level at which to set the potential energy equal to 0.
If an object is on top of a hill or in a position raised above the ground, it must have gravitational potential energy.
What is Potential Energy ?
In physics, potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors
If an object is lifted, work is done against the force of gravity.
When work is done energy is transferred to the object and it gains gravitational potential energy.
If the object falls from that height, the same amount of work would have to be done by the force of gravity to bring it back to the Earth’s surface.
Due to the Principle of Conservation of Energy we can say that:
Gravitational potential energy at the top = kinetic energy at the bottom
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Please help me!!!! I will give you brainliest!!!
Answer:
A and C
Explanation:
I think it's A and C but I could be wrong
1. It has been suggested that pain results from a change in the pH of solutions that surround nerves in the body.
Many irritating insect bites, for example, are acidic. The fluid inside your cells is also slightly acidic. When a cut
or a burn releases this fluid, the pain is signalled through your nerve endings. What would you expect to find if
you tested the pH of creams and lotions that are used to treat insect bites? Explain our answer. (2 marks)
2. Explain why a compound named methene cannot exist. (2 mark)
Answer:
See Explanation
Explanation:
According to the question, it is established that the pain caused by a lot of insect bites owes to the acidity of the insect bites.
If this is true, then there is an urgent need to neutralize the acidic insect bite using a basic substance.
Hence the pH of the creams used to treat insect bites should be basic(having a high pH).
2. The compound methene can not exist because it is supposed to be derived from the alkane called methane which contains only one carbon atom.
In order to form an alkene, there must be a double bond between two carbon atoms. This is not possible because there is only one carbon atom in the hypothetical methene. Hence, a compound named methene cannot exist.
What might happen if the mouse was removed from this
food web? Please be specific and mention ALL organisms
affected.
I’ll give u brainliest hurry
Answer:
They would most likely starve and die UNLESS they could move to another habitat or tend to eating other sources of food. All the other animals in the food web would die too, because their food supplies would have gone. The populations of the consumers would fall as the population of the producer fell.
When a organism is removed, the organism who eats or hunt them will decrease some because they lost one of the food source even though they still have other food sources. This new organism will brake the balance of the ecosystem so their food sources will decrease by having too many predators that hunt and eat them.
In food chain's if one source from it is ever removed it would mess up the entire chain causing issue
Given the following equation: Na2O + H2O ---> 2 NaOH
How many moles of NaOH are produced from 1.02 moles of Na2O?
Answer:
2.04 moles
Explanation:
Since the ratio of Na2O to NaOH is 1:2, you multiply the number of moles by 2, equaling 2.04 moles.
What is the volume of 0.9 g of O2 at STP?
1.16g of methane burns completely with 4.16g of oxygen to form 3.52g of carbon dioxide and
water If the reaction obeys the law of conservation of mass, the weight of water formed is
Answer:
weight of H₂O formed = 2.3 grams H₂O (2 sig. figs.)
Explanation:
Rxn: CH₄(g) + 2O₂(g) => CO₂(g) + 2H₂O(g)
Given: 1.16g 4.16g 3.52g ? (g)
Moles: 1.16g/16g·mol⁻¹ 4.16g/32g·mol⁻¹ 3.52g/44g·mol⁻¹
= 0.0725mol. = 0.13mol. = 0.08mol. => ? (moles)
Limiting Reactant: Divide each mole value by related coefficient of balanced standard equation (that is, balanced with coefficients in lowest whole number ratios). The smaller value is the limiting reactant.
0.0725/1 0.13/2 0.080/1
= 0.0725 = 0.065 = 0.080
Limiting Reactant is O₂(g) => 0.065 is smaller value after dividing each mole value by related coefficient of balanced equation.
NOTE: When working problem, however, one must use the mole value calculated from given amount in grams. That is, in this case 0.13 mole O₂. The 'divide by related coefficient and check smaller value' is ONLY for identifying the limiting reactant. This trick works for ALL general chemistry problems.
Moles H₂O formed: Since the coefficient of the limiting reactant (O₂) equals the coefficient of water (H₂O), then the moles of water formed is 0.065 mole H₂O.
Weight (in grams) of H₂O formed:
Grams H₂O = moles H₂O x formula weight H₂O
= 0.13 mole H₂O x 18 g H₂O/mole H₂O
= 2.34 g H₂O (calculator answer)
= 2.3 g H₂O (final answer should be rounded to 2 sig. figs.) => form of final answer should be based on data in final computation having the least number of sig. figs.
Review: Sequence of calculations
Write and balance equation to smallest whole no. ratio of coefficients.If not in moles, convert given 'measured' data to dimension of moles. => moles = mass (g)/formula wt(g·mol⁻¹) => moles = volume of gas in Liters/Std Molar Volume (= 22.4L·mole⁻¹ at STP) => moles = no. of particles / Avogadro's No. (= 6.02 x 10²³ part's/mole)Determine Limiting Reactant => mole values of each compound given / related coefficient in standard equation => smallest value is L.R.Determine moles of unknown needed/used/formed from limiting reactant in moles and coefficient of unknown compound in standard equation given data values.=> moles of limiting reactant / coefficient of same cpd. in std. equation = unknown (X) / coefficient of same (unknown) cpd. in std. equation
=> cross multiply and solve for unknown (X)
=> L.R.(moles) / eqn. coef. of L.R. = X / eqn. coef. of X
=> (L.R.(calc'd moles)(eqn. coef. of X) = (X)(eqn. coef. of L.R.)
=> X (in moles) = (L.R.(calc'd. moles)(eqn. coef. of X) / (eqn. coef. of L.R.)
Convert X-answer in moles to desired dimension specified in problem.=> grams = moles x formula wt.
=> volume (L) = moles x std. volume (= 22.4L/mole)
=> #particles = moles x Avogadro's Number (= 6.02 x 10²³ parts/mole)
please help me! I put the max brainly points!
Answer:
579 mL, .96 kPa, 34.21 c
Explanation:
Explanation:
1.Answer:579 ml
2.Answer:0.96
3.Answer:34.21 C
This is the right Answer :3
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