Answer: they have a net positive charge
Explanation:
Most solid solutes will dissolve ___ at ___ temperatures
A. slower, higher
B. faster, higher
C. faster, lower
Answer:
B
Explanation:
The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions.
Can CBD product be harmful
What is the smallest substance? molecule mixture compound
Answer:
Molecule is the smallest i took the quiz and it was that!
Explanation:
Hope I helped! :>
what is the mass of 5.0mol of NaOh
Answer:
200 g NaOH
General Formulas and Concepts:
Reading a Periodic TableDimensional AnalysisExplanation:
Step 1: Define
5.0 mol NaOH
Step 2: Define conversions
Molar Mass of Na - 22.99 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of NaOH - 22.99 + 16.00 + 1.01 = 40 g/mol
Step 3: Convert using DA
[tex]5.0 \ mol \ NaOH(\frac{40 \ g \ NaOH}{1 \ mol \ NaOH} )[/tex] = 200 g NaOH
Step 4: Check
We are given 2 sig figs. Follow sig fig rules.
We only have 1 sig fig in 200. No need to round.
Which of the following converts chemical energy = kinetic energy electrical energy?
Answer:
electrical energy is used to produce chemical energy.
Explanation:
A nitride ion has 7 protons, 8 neutrons, and 10 electrons. What is the overall charge on this ion?
–3
–2
0
+3
Answer:
-3
Explanation:
Given parameters:
Number of protons = 7
Number of neutrons = 8
Number of electrons = 1 0
Unknown:
Overall charge on the nitride ion = ?
Solution:
The overall charge on an specie can be determined by;
Charge = number of protons - number of electrons
Charge = 7 - 10
Charge = -3
A nitride ion has 7 protons, 8 neutrons, and 10 electrons. –3 is the overall charge on this ion. Therefore, the correct option is option A.
What is ionic charge?
Ionic force An ion's electrical charge is produced when a number of electrons from a single atom or set of atoms are gained (creating a negative charge) or lost (creating a positive charge). Mineral bonding strength is significantly influenced by ionic charge (for instance, Fe3+ forms a stronger link than Fe2+ with identical ions).
Which elements inside a crystal lattice can be substituted for one another. Electrostatically applied opposite charges provide the ionic connection between ions. MgO is the final form of magnesium oxide. A nitride ion has 7 protons, 8 neutrons, and 10 electrons. –3 is the overall charge on this ion.
Charge = number of protons - number of electrons
Charge = 7 - 10
Charge = -3
Therefore, the correct option is option A.
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12. The following represents two substances by showing only one molecule 1 point
of each substance. A chemical reaction occurs when hydrogen chloride
and sodium hydroxide are combined. Which of the following represents the
molecules that are the products of the chemical reaction?*
A.
B.
C.
D
Answer:
b
Explanation:
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scientists studying squirrels in a forest observed that the squirrel population decrease over a period of five years. which statement is the most likely explanation for the decrease in the population?
A) the death rate was greater that the birth rate.
B) the birth rate was equal to the death rate
C) the rate of immigration was equal to the rate of emigration
D) the rate of emigration was less than the rate of immigration
Answer:
b
Explanation:
PLEASE HELP
Which conducts heat more efficiently- a solid, liquid or gas? Why is that (explain on molecular level)?
Answer
solids conduct heat more efficiently ! basically their particles are more tightly packed and stay in that position, so the heat transfer by collision allows for the best conduction
Explanation:
hope this helps ! :)
Which of the following quantum leaps would be associated with the greatest energy of emitted light? n = 2 to n = 5 n = 5 to n = 4 n = 5 to n = 1 n = 4 to n = 5
Answer: I think it’s n=5 to n=1
Explanation:
The greatest energy has been emitted with the radiation of the quantum leap associated with n=5 to n=1. Thus, option C is correct.
Quantum leaps have been the atomic orbitals that has been holding the electrons. The orbitals have been arranged with the increasing order of the energy.
The atoms has been required to gain energy in order to jump from the lower energy level to the higher energy level. There has been the emission of the radiations when the atoms have been returned from the excited state to the ground state.
The energy of the emitted radiations have been maximum with the return of the electron from the higher energy level to the lowest. Thus, the greatest energy has been emitted with the radiation of the quantum leap associated with n=5 to n=1. Thus, option C is correct.
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A mixture of the gases neon and krypton is in a 2.00 L container with a pressure of 1.60 atm. The partial pressure of the neon is 0.40 atm. What is the partial pressure of the krypton?
Answer:
P(Kr) = 1.2 atm
Explanation:
According to Dalton law of partial pressure,
The total pressure inside container is equal to the sum of partial pressures of individual gases present in container.
Mathematical expression:
P(total) = P₁ + P₂ + P₃+ ............+Pₙ
Now we will solve this problem by using this law
Total pressure = 1.60 atm
Partial pressure of neon = 0.40 atm
Partial pressure of krypton = ?
Solution:
P(total) = P(Ne)+ P(Kr)
1.60 atm = 0.40 atm +P(Kr)
P(Kr) = 1.60 atm - 0.40 atm
P(Kr) = 1.2 atm
The partial pressure of Krypton in the mixture has been 1.2 atm.
Partial pressure can be defined as the pressure exerted by a single gas in the solution.
According to Dalton’s law of partial pressure, the total pressure of the gas has been the summation of the partial pressure of each gas present in the mixture.
Total pressure = Partial pressure of A + Partial pressure of B + Partial pressure of C……
The given mixture has been consisted of neon and krypton. The total pressure of the mixture has been:
Total pressure = Partial pressure of Ne + Partial pressure of Kr
The total pressure = 1.60 atm.
The partial pressure of Ne = 0.40 atm.
Substituting the values:
1.60 atm = 0.40 atm + Partial pressure of Kr
Partial pressure of Kr = 1.60 - 0.40 atm
Partial pressure of Kr = 1.2 atm.
The partial pressure of Krypton in the mixture has been 1.2 atm.
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A graduated cylinder has a radius of 1.0 45 cm and a height of 30.48 CM what is the volume of a cylinder in centimeters to the power of 3
Bdbddbdnnrndnden
Explanation:
BdbddbdnrnrnrndnrnrnrnrjrjrnrrnrnrjrjrBdbddbnrrnnrrnrnrnrnrnrjrjrrnnrnrnrdjrnrnrndndndnrn
what does buffer do?? (Chemistry)
Answer:
C, It resists a change in pH when H+ or OH is added to a solution.
Explanation:
a p e x
A hockey player is wearing ice skates and pushes against the wall propelling her backward on the ice. According to Newton's third law of motion, which of the following best compares the forces acting between the wall and the hockey player?
A.
The forces are equal and applied in the same direction.
B.
The forces are different sizes and applied in the opposite direction.
C.
The forces are equal and applied against gravity.
D.
The forces are equal and applied in the opposite direction.
its D
random characters AAAJIJRIAJKLGIJHEOGEINDKIKAN
If an element is on the 4th row of the periodic table...how many energy levels/rings would you need to draw a Bohr 's model of the element's atom?
Answer:
4 energy levels/rings
Explanation:
By the atomic model proposed by Niels Bohr, the electrons orbit around the nucleus in shells having different energy level each with the ability to contain a given maximum amount of electrons.
The closest shell to the nucleus named the K shell, can have a maximum of two electrons, the next shell known as the L shell can have 8 electrons while the next shell, M, can have a maximum of 18 electrons
The arrangement of the periodic table is based on the number and location of electrons such that elements in the 4th row (period 4 elements) have three completed energy levels/rings before, their valence ring making the total number of rings = 4 energy levels/rings.
Water is added to a test-tube containing dilute NaOH of pH 11. What could be the pH of the resulting solution?
Answer:
NaOH atomic mass is 39.977
pH is 11 due to dilution must be multiplied by 0.11 to find pH
39.977 x 0.11 = 0.43979 x 100%
43% pH
How do you accurately describe a electron?
Answer:
I would say voting. I hope that helped or just report my comment.
Explanation:
Carbon dioxide and ____ are outputs of cellular respiration
Answer:
oxygen
Explanation:
plants use oxygen
Outline the two main observations that led Wegener to propose the theory of continental drift.
Answer:
for continental drift included the fit of the continents; the distribution of ancient fossils, rocks, and mountain ranges; and the locations of ancient climatic zone
Explanation:
What type of chemical reaction can be seen below?
C2H6 + O2 - CO2 + H2O
The formula for table salt is NaCl. When asked to name the compound in class, you notice one of your classmates typed "sodium chlorine" in the chat. Explain why this answer is incorrect.
Answer:
It should be Sodium Chloride
Explanation:
Sodium chloride, regular table salt, is also known as the mineral halite. The diagram to the right shows how sodium and chlorine atoms pack tightly together to form cube-like units of the compound NaCl. Crystals of table salt imitate this structure-they're shaped like little cubes.
Which types of mechanical weathering are most likely represented below?
A. A) Salt weathering, B) root wedging, C) pressure release, D) lichen growth
B. A) Heat expansion, B) lichen growth, C) salt weathering, D) abrasion
C. A) Abrasion, B) root wedging, C) heat expansion, D) salt weathering
D. A) Frost wedging, B) root wedging, C) salt weathering, D) heat expansion
The type of mechanical weathering that is most likely represented below is A) Frost wedging, B) root wedging, C) salt weathering, and D) heat expansion. The correct option is D.
What is mechanical weathering?Mechanical weathering is a rock that can be broken apart mechanically by processes like ice solidifying in fractures in the rock, and tree roots sprouting in those same crevices.
Rock expanding and contracting in locations with high daytime temperatures and low overnight temperatures, rock cracking during forest fires, and so on. Salt weathering is a different kind of mechanical weathering. It functions similarly to how freeze-thaw weathering does. When sea salt spray enters a rock fissure, salt weathering occurs.
Therefore, the correct option is D. A) Frost wedging, B) root wedging, C) salt weathering, and D) heat expansion.
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which of the following actions would cause the volume of the chamber below to increase to 36.0 L?
Answer:
Option C. Triple the number of moles
Explanation:
From the ideal gas equation:
PV = nRT
Where:
P is the pressure
V is the volume
n is the number of mole
R is the gas constant
T is the absolute temperature.
Making V the subject of the above equation, we have:
PV = nRT
Divide both side by P
V = nRT / P
Thus, we can say that the volume (V) is directly proportional to both the number of mole (n) and absolute temperature (T) and inversely proportional to the pressure (P). This implies that and increase in either the number of mole, the absolute temperature and a decrease in the presence will cause the volume to increase.
Thus, the correct option is option C triple the number of moles. This can further be seen as illustrated below:
Initial volume (V1) = 12 L
Initial mole (n1) = 0.5 mole
Final mole (n2) = triple the initial mole = 3 × 0.5 = 1.5 mole
Final volume (V2) =?
From:
V = nRT / P, keeping T and P constant, we have:
V1/n1 = V2/n2
12/0.5 = V2/1.5
24 = V2/1.5
Cross multiply
V2 = 24 × 1.5
V2 = 36 L.
Thus Option C gives the correct answer to the question.
The ionization energies for removing successive electrons from sodium are 496 kJ/mol, 4562 kJ/mol,
6912 kJ/mol, and 9544 kJ/mol. The great jump in ionization energy after the first electron is removed
indicates that
Select one:
O a. sodium has four or five electrons.
O b. the atomic radius has increased.
c. a d-electron has been removed.
d. the noble gas configuration has been reached.
Answer:
D
Explanation:
The high jump of ionization energy indicates that we are trying to remove electron from noble gas configuration state.
The ionization energy data specifies that the Elements are from group 1 at period 3 or greater.
Removing the first electron require 496 kJ and the second ionization energy jump significantly due to the removal of electron from the noble gas configuration which is logical because electron try to maintain the especially stable state.
Hydrogen is considered to be a (metal, non-
metal) of relatively (high, low) electronega-
tivity.
1. nonmetal; low
2. nonmetal; high
3. metal; low
4. metal; high
Answer:
the answer is 1. nonmetal; low
Which piece of laboratory equipment would be most helpful for measuring small amounts of a solution in the laboratory?
A. 300 mL flask
B. Micropipette
C. 500 mL graduated cylinder
D. 500 mL beaker
Answer:
500 mL graduated cylinder
Explanation:
it is used for small liquids
a student places a small stone with a mass of 5 g into a graduated cylinder containing 50 mL of water. With the stone in the graduated cylinder, the water rises to 75 mL. What is the density of the stone?
Answer:
The answer is 0.2 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
volume = final volume of water - initial volume of water
volume = 75 - 50 = 25 mL
We have
[tex]density = \frac{5}{25} = \frac{1}{5} \\ [/tex]
We have the final answer as
0.2 g/mLHope this helps you
Why is DNA important in living organisms?
Answer:
DNA is a vital for all living beings even plants.
Explanation:
It is important for inheritance, coding for proteins and the genitic instruction guide for life and its processes. DNA holds the instruction for an organisms or each cells development and reproduction and ultimately death.
What happens if you overmix muffins?
Answer: When you overmix the muffin batter, it crushes the air bubbles and ruins the fluffy texture.
Explanation: → Follow this tip: To ensure a batch of light, fluffy muffins, mix the dry ingredients with the wet ingredients until just barely combined, and no more dry flour is visible.
Which object absorbs the most sound waves?
O A. Tissue paper
O B. Air
O C. Earplugs
O D. Water
Answer:
Earplugs
Explanation:
Because sound waves absorb most sound, the sound is coming from the earplugs which creates the most sound waves rather than water, tissue paper, and air. Hope i helped :)
Answer:
Earplugs
Explanation:
