which statement describes all chemical changes but not all physical changes a bubbles are produced b a new substance forms c phase changes occur D a color change occurs
Answers
The correct answer is:
B; A new substance forms.
Explanation:
A physical change, such as a state change or dissolving, does not produce a new substance, but an abundant change does. In a chemical reaction, the atoms and molecules that connect with each other are described as reactants. Chemical reactions happen when chemical bonds are broken and formed. If the molecules in a substance crash into each other with enough energy, some of the bonds in the molecules can break. The atoms can make new bonds with different atoms. A new substance forms.
Related Questions
How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen?1) 1 mol of oxygen has fewer molecules.2) 1 mol of oxygen has more molecules.3) Each sample has the same number of molecules.4) The molecules cannot be compared without knowing the mass.
Calculate the percent by mass of the solute in each of the following aqueous solutions: (a) 5.50 g of NaBr in 78.2 g of solution, (b) 31.0 g of KCl in 152 g of water, (c) 4.5 g of toluene in 29 g of benzene.
The electron affinity of an atom typically depends on theA. mass of the atom's nucleus. B. number of electrons already present in the atom. C. number of neutrons in the nucleus of the atom. D. availability of an unfilled orbital in the atom.
Which hand is negatively charged? Ο Α. OB. Oc. OD.
Answers
1.998 ml of hydrogen gas volume is is required to react with 10.5 g of linolenic acid in this reaction.
Explanation:
Data given:
mass of linolenic acid is given = 10.5 grams
atomic mass of linoleinic acid = 278.43 grams/mole
volume of hydrogen required at STP = ?
Balance chemical reaction:
C18H30O2 + 3H2 --->C18H36O2
moles of linoleinic acid given =
putting the values in the equation:
moles of linoleinic acid =
= 0.037 moles
from the balanced equation:
1 mole of linoleinic acid reacts with 3 moles of hydrogen
so, 0.037 moles will react with x moles of hydrogen gas
=
x = 0.111 moles of water
volume or mass = atomic mass x number of moles
volume of hydrogen gas= 1.998 ml
Final answer:
Around 2.53 liters of hydrogen gas, at STP, is required to fully hydrogenate 10.5 g linolenic acid to stearic acid.
Explanation:
To solve this problem, we first need to find the molar mass of linolenic acid (C18H30O2). The molar mass is calculated by adding the molar masses of all the atoms in the molecule: (18*12.01) + (30*1.01) + (2*16.00) = 278.44 g/mol. Next, we calculate the number of moles of the linolenic acid we have: 10.5 g / 278.44 g/mol = 0.0377 mol. According to the balanced chemical equation, we need 3 mol of hydrogen per mol of Linolenic acid, so we need 0.0377 mol * 3 = 0.1131 mol of hydrogen gas. Finally, at STP, 1 mole of any type of gas occupies a volume of roughly 22.4 L, so the volume required is 0.1131 mol * 22.4 L/mol = 2.53 L.
Learn more about Stoichiometry here:
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Answers
Final Answer:
Kelvin Absolute Temperature:
The kelvin, symbol K, is a unit of measurement for temperature. The Kelvin scale is an absolute scale, which is defined such that 0 K is absolute zero, the lowest temperature possible on Earth.
Historically developed from the Celsius scale, the conversion is thus:
And absolute zero, 0 K = -273.15° C, the lowest temperature possible.
Knowing this, we can solve the question as:
To learn more about the Kelvin Absolute Temperature Scale:
The Kelvin temperature equal to -33℃ is 240 K.
Answers
The plausible reason for the change in mineral A will be the lower activation energy than the transferred energy.
The addition of energy will result in the change in the minerals if the activation energy is exceeded.
The minerals found in mining A and B have transferred the energy. The minimum amount of energy required to do the transition in the atoms in the activation energy.
The possible reason for the change in the mineral A will be the lower activation energy for the mineral A. The mineral B does not change because the activation energy of mineral B is higher as compared to mineral A.
For more information, refer to the link:
Answer: Mineral A changed because Molecular energy transferred is equal or greater than than its Activation energy
Mineral B didn't change because Molecular energy transferred is less than its Activation energy.
Explanation:
The molecules of Mineral A has been disturbed by the addition of energy causing a change and the entropy is increased. The Molecules of Mineral B has not been disturbed because the residual energy has not been overcome and therefore yielding no visible change
2(39.10) + 16.00 = 94.20 g/mole
Moles
5.85 moles
Mass (grams)
Particles
Answers
Answer:
yes
Explanation:
that is the answer
Answers
Answer:
b and d are physical
a and c are chemical
hope dis helps
PLZ GIVE BRAINLIEST!!!!!!
Answer:
Burning of a House: Chemical Change
cutting candle wax: physical change
buring a candle: chemical change
keying a car: physical change.
Answers
D. 6 electrons
A single nitrogen atom has five electrons in its outer energy level to start, and will be most stable with an octet, or 8 electrons in its outer level.
Calculate the number of valence electrons of N2
N= 2x 5 = 10
N2 has a total of 10 valence electrons, to become stable each N atom needs 8 electrons.
So, therefore, 6 electrons would have to be a part of covalent bonds because they share 6 electrons in a triple bond.