Answers
The answers are: T, T, F, T, T, T
Answer:
True
True
False
True
True
True
Explanation:
Related Questions
How many moles would there be in 500,000,000,000 atoms of silver? Show your calculation
and answer in unit
Answers
Answer: 3.01 * 10^35
Explanation:
500,000,000,000 * 6.02 * 10^23
There are 3 [tex]\rm \times\;10^3^5[/tex] moles of silver present in the 500,000,000,000 atoms of silver.
According to the concept of molar mass:
1 atom = [tex]\rm 6.023\;\times\;10^2^3[/tex] moles
500,000,000,000 atoms of silver can be written as:
5 [tex]\rm \times\;10^1^1[/tex] atoms of silver.
1 atom = [tex]\rm 6.023\;\times\;10^2^3[/tex] moles
5 [tex]\rm \times\;10^1^1[/tex] atoms = 5 [tex]\rm \times\;10^1^1[/tex] [tex]\times[/tex] [tex]\rm 6.023\;\times\;10^2^3[/tex] moles
5 [tex]\rm \times\;10^1^1[/tex] atoms = 30.115 [tex]\rm \times\;10^3^4[/tex] moles
= 3 [tex]\rm \times\;10^3^5[/tex] moles.
The moles of silver are present in the 500,000,000,000 atoms of silver are 3 [tex]\rm \times\;10^3^5[/tex] moles.
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What are the four most important elements on earth?
hellum
carbon
water
nitrogen
O oxygen
hydrogen
Answers
Answer:
These four atomic elements are oxygen, carbon, hydrogen, and nitrogen.
Explanation:
hope it helps....
Answer:
Nitrogen/Carbon/Oxygen/Hydrogen
Explanation:
I believe those would be the most important because:
Nitrogen - Composing 78% of earths atmosphere.
Carbon - Building blocks for all known life.
Oxygen - We breath it as well as it composes 21% of our atmosphere.
Hydrogen - Makes up a bunch of compounds (like water) that enable humans to live.
Why is DNA important in living organisms?
Answers
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.
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
Answers
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 converts chemical energy = kinetic energy electrical energy?
Answers
Answer:
electrical energy is used to produce chemical energy.
Explanation:
Water is added to a test-tube containing dilute NaOH of pH 11. What could be the pH of the resulting solution?
Answers
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
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?
Answers
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.
In order for sodium to have 8 valence electrons it would need to either gain _____ electrons or lose _____ electron.
Answers
Answer:
7
Explanation:
sodium has 1 valence electron because of its place on the periodic table. a trick to use is included in the picture below to find out how many valence electrons an element has. to get from 1 to 8 we add 7.
I hope this helps :))
Most solid solutes will dissolve ___ at ___ temperatures
A. slower, higher
B. faster, higher
C. faster, lower
Answers
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.
CO2 is a ____________________
Group of answer choices
1.compound
2.element
3.mixture
4.solution
Answers
Answer:
CO2 is a compound
hope it helps
Help fast... thanks I’ll give you brainliest
Answers
Answer:
Graph E matches description 3 (the car is accelerating).
Explanation:
When the graph increases, the line is turned up (graph E). So when something accelerates, it is going to increase. In this case, it would increase by speed.
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
Answers
Answer:
500 mL graduated cylinder
Explanation:
it is used for small liquids
The purpose of copper chloride and water. Please answer !!!!!!!!!!!!!!!!!! Will mark Brianliest !!!!!!!!!!!!!!!!!!!!!!!!
Answers
A nitride ion has 7 protons, 8 neutrons, and 10 electrons. What is the overall charge on this ion?
–3
–2
0
+3
Answers
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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Which of the following contains the most atoms?
24.305 g Mg
39.098 gk
21.62 g B
9.0122 g Be
Answers
Explanation:
9.0122 g be Maybe, sorry i don't think so
In the above , the sample of B 21.62 g of boron contains the most atoms because it has approximately 2 moles, while the other samples have only 1 mole each.
What is atomsThe molar mass of each element can be found on the periodic table.
The molar mass of Mg (magnesium) is about 24.305 g/mol.The molar mass of K (potassium) is about 39.098 g/mol.The molar mass of B (boron) is approximately 10.81 g/mol.The molar mass of Be (beryllium) is about 9.0122 g/mol.To calculate the number of moles in each sample, we divide the mass of each sample by its respective molar mass:
For Mg: Number of moles = 24.305 g / 24.305 g/mol = 1 moleFor K: Number of moles = 39.098 g / 39.098 g/mol = 1 moleFor B: Number of moles = 21.62 g / 10.81 g/mol ≈ 2 molesFor Be: Number of moles = 9.0122 g / 9.0122 g/mol = 1 moleTherefore, the sample with 21.62 g of boron (B) contains the most atom
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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
Answers
Answer:
b
Explanation:
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Carbon dioxide and ____ are outputs of cellular respiration
Answers
Answer:
oxygen
Explanation:
plants use oxygen
How do you accurately describe a electron?
Answers
Answer:
I would say voting. I hope that helped or just report my comment.
Explanation:
which of the following actions would cause the volume of the chamber below to increase to 36.0 L?
Answers
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.
Can CBD product be harmful
Answers
PLEASE HELP
Which conducts heat more efficiently- a solid, liquid or gas? Why is that (explain on molecular level)?
Answers
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 ! :)
what is the mass of 5.0mol of NaOh
Answers
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.
What does one mole of H2O correspond to?
A.
6.02 × 1023 molecules of H2O
B.
6.02 × 1023 atoms of H and 6.02 X 1023 atoms of O
C.
6.02 × 1023 atoms of O
D.
6.02 × 1023 atoms of H
E.
6.02 × 1023 × 2 atoms of H
Answers
Answer:
Its A
Explanation:
Just took the test and got a 100%
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.
Answers
its D
random characters AAAJIJRIAJKLGIJHEOGEINDKIKAN
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
Answers
Answer:
b
Explanation:
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.
Answers
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.
An element found in groups 3-12 of the periodic table is classified as a[n]
Answers
Answer:
Transition Metals
Explanation:
Hope this helped :)
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
Answers
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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(b)Calculate the number of moles of CuSO4 that were in the impure sample of CuSO4(s) .
(c) In addition to the number of moles of CuSO4 calculated in part (b) , what other quantity must be measured in order to calculate the mass percentage of CuSO4 in the impure sample of CuSO4(s) ?
Need help now
Answers
Answer:
The questions are incomplete
Explanation:
(b) This question is incomplete. However to calculate the number of moles of CuSO₄ present in the impure sample. The formula below can be used;
number of moles = mass of CuSO₄ present in the impure sample ÷ molar mass of CuSO₄
(c) This question is also incomplete. However, to calculate the mass percentage of CuSO₄ present in the impure sample of CuSO₄, the formula below can be used.
Mass percentage of CuSO₄ =
mass of CuSO₄ present in the impure sample/mass of impure CuSO₄ × 100
Thus, the mass of the impure sample must be measured also since the actual mass of the CuSO₄ present in the impure sample must have been measured before calculating the number of moles.
can someone tell me the answer
