The resistance and the effort force are used to calculate the mechanical advantage. Arranging the threads of the screw closer together will increase the mechanical advantage. Thus, option C is correct.
What is the mechanical advantage?Mechanical advantage is the ratio of the output force to the input force. It allows easier task performance by obeying the conservation of mass.
The closer threads of the screws make the distance covered to be more, and the force applied will be multiplied which will be a mechanical advantage over threads placed far apart.
Therefore, option C. threads located closer have more mechanical advantages.
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2. How many moles of carbon dioxide, CO2, are in a 22 gram sample of the compound?
Covalent compounds are prevalent in nature and are the primary structure of most organisms. Based on the periodic table, which pair of elements would most likely form a covalent bond?
boron (B) and carbon (C)
aluminum (Al) and silicon (Si)
carbon (C) and oxygen (O)
magnesium (Mg) and sulfur (S)
Based on the periodic table and due to their nonmetallic nature, carbon (C) and oxygen (O) form covalent bonds.
What is a covalent bond?A covalent bond is a type of chemical bond in which elements share electrons. It is formed between nonmetals.
Based on the periodic table, which pair of elements would most likely form a covalent bond?
boron (B) and carbon (C). B is a metalloid and C a nonmetal, so they don't form covalent bonds.aluminum (Al) and silicon (Si). Al is a metal and Si a metalloid, so they don't form covalent bonds.carbon (C) and oxygen (O). Both C and O are nonmetals, so they do form covalent bonds.magnesium (Mg) and sulfur (S). Mg is a metal and S a nonmetal, so they don't form covalent bonds.Based on the periodic table and due to their nonmetallic nature, carbon (C) and oxygen (O) form covalent bonds.
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.
unen a person gets too hat, his or her body will begin to
Swee
until the body's temperature is back
to normal. In sentences explain why this is an example of
homeostasis.
Drow a picture of the body's reaction to being too hot.
Which law does the equation below represent? Mass reactants = Mass products
Answer:
law of conservation of mass
Explanation:
The law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products.
Use the drop-down menus to complete each of the sentences. isotopes behave similarly in . involve only a rearrangement of electrons, and do not involve changes in protons or neutrons. in , a large amount of energy is released or absorbed. new elements can be formed as a result of . exothermic and endothermic reactions can occur during .
Isotopes show similarity in chemical properties, and in exothermic reaction heat is released and in endothermic reaction heat is absorbed.
What are chemical reactions?
Chemical reactions are those reactions in which reactants combine with each other for the formation of products.
Isotopes are those species in which atomic masses are different and having the same atomic number and all are having the same chemical properties.Chemical reactions are those reactions in which change in electrons takes place for the formation of new compound, but changes in neutron and proton does not takes place.A large amount of energy is absorbed or released during a nuclear reaction when nucleus is split into radiations.Exothermic reactions are those in which heat is released and endothermic reactions are those in which heat is absorbed.Hence correct explanations are given above.
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Answer:
1. Top (Chemical)
2. Top (Chemical)
3. Middle (Nuclear)
4. Middle (nuclear)
5. Bottom (Both)
Explanation:
Nya has a cup of hot tea that she lets cool down for several minutes. what effect does cooling have on the tea? its particles have less kinetic energy. its particles have more kinetic energy. its specific heat increases. its specific heat decreases.
Nya has a cup of hot tea that she lets cool down for several minutes so effect of cooling on the tea is that its particles have less kinetic energy.
What is the relation between temperature and K.E.?Relation between the kinetic enegy and temperature of any substance will be represented as:
K.E ∝ 3/2kT
From the above realation it is clear that kinetic energy is directly proportional to the temperature of the substance. So when a cup of tea cool down its temperature decreases as a result of which kinetic energy of particles present in cup of tea also decreases.
Specific heat dependence on temperature is very weak as compared to K.E. so it will be negligible.
Hence particles of tea have less kinetic energy.
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Answer:
Its particles have less kinetic energy.
Explanation:
The water molecule has a ________ geometry because its central atom has ________ bonds and ________ lone pairs of electrons
Answer:
bent; two; two.
Explanation:
Based on the chemical formula, the water molecule is consists of 2 Hydrogen atoms and one Oxygen atom.
The water molecule has a bent geometry because it's central atom has two bonds and two lone pairs of electrons.
When discussing distances between objects in the solar system, which term do you use?
Actual distance
Apparent brightness
Relative brightness
Relative distance
Answer: (D) Relative Distance
Explanation:
.
How many molecules of nitrogen gas are found in 0. 045 L of nitrogen gas at STP?
Answer:
See below
Explanation:
.045 liter / 22.4 l / mole * 6.022 x 10^23 molecules/mole * 2 atoms/molecule =
( * 2 becuase nitrogen gas is diatomic)
What is the pressure, in atmospheres, of 14.3 moles of a gas at a temperature of 485 K in a 187 liter container?
P
V
=
n
R
T
R = 0.0821
a
t
m
⋅
L
m
o
l
⋅
K
Answer:
3.04 atm
Explanation:
First note r is in l*atm/mole*K
PV=nRT
P = nRT/V = 14.3(.0821)(485)/187 = 3.04 atm
What best describes the hydrogen atom in a bond such as H-CI?
Answer:
a. a part of ionic bond with Cl
If 40 grams of NaCl was dissolved in 100 grams of water at 100 degrees Celsius, the solution would be.
a. ) saturated
b. )unsaturated
c. )supersaturated
d. )saturated with excess
Answer:
saturated solution
Explanation:
How many liters do you need to make a 1.2 M solution using 54.4 grams of copper (II) fluoride?
Answer:
Our differences make us special.
Explanation:
Which type of radiation does not cause a change in the atomic number of the atom?
Answer:
Gamma radiation. Explanation: Gamma radiation produces not only the least change in mass and atomic numbers, but produces no change in mass number, atomic number, or electric charge. Both alpha and beta radiation do produce these changes.
In the equation:
4NH3 + 502 → 4NO + 6H2O
Find the volume of oxygen that reacts with 1. 12 L of NH3.
0 0,896 L
O 1. 4L
01. 12 L
O 5. 6L
Answer:
1.4 l
Explanation:
Assuming they are the same temperature
5/4 = O/1.12
1.12 * 5/4 = L of O2 = 1.4 l
a student makes a model of the solar system on a poster board . the student uses foam balls to represent object on the solar system . the student model is shown . explain one error concerning the size of the foam balls on the model
The model of the solar system by the student would contain an error if he did not use different ball sizes which are in proportion to the size of each planet.
What is the solar system?The solar system is the system of the Sun and it's nine planets.
The Sun is the main star and source of energy in the solar system.
The planets in the solar system are of different sizes and orbit at various distances around the Sun.
This a student modelling the solar system should use different ball sizes in proportion to the size of each planet.
Therefore, the model of the student would contain an error if he did not use different ball sizes which are in proportion to the size of each planet.
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Consider the balanced reaction
below:
P2O3 + 3H2O → 2H3PO3
How many grams of diphosphorus
trioxide, P203, are required to
produce 10.2 moles of phosphorous
acid, H3PO3?
Answer:
561 [gr.].
Explanation:
try the option suggested in the attached picture. The answer is underlined with orange colour.
19. What is the new volume of a solution that is created when 4. 2 mL of a 9. 1 M NaOH stock solution is diluted to a concentration of 2. 8 M? (M1V1 = M2V2 )
A) 6. 0 mL
B) 7. 38 mL
C) 10. 1 mL
D) 13. 65 mL
Answer:
A 6.0
Explanation:
What is the molar mass of NaCl? If you need to add 0.2 moles of NaCl to 500 mL of water, how many grams of NaCl do you need to add?
Answer:
321 g
Explanation
All you need to know here is that the molarity of a solution tells you the number of moles of solute present in exactly
1 L
of the solution.
In your case, a
2.20-M
sodium chloride solution will contain
2.20
moles of sodium chloride, the solute, for every
1 L
of the solution.
So if every
1 L
of this solution must contain
2.20
moles of sodium chloride in order for the solution to have a molarity of
2.20 M
, it means that
2.50 L
of this solution must contain
2.50
L solution
⋅
2.20 moles NaCl
1
L solution
=
5.50 moles NaCl
To convert the number of moles of sodium chloride to grams, use the molar mass of the compound.
5.50
moles NaCl
⋅
58.4 g
1
mole NaCl
=
321 g
−−−−−
The answer is rounded to three sig figs.
We’re learning about mole I need help on these last questions of my chemistry packet please help me
Answer:
1. [tex]2.879 * 10^{23}[/tex] atoms of AgCl
2. [tex]1.96 * 10^{7}[/tex] g of Bi
3. [tex]C_2H_8O[/tex]
Bonus: [tex]8.31*10^{23}atomsC[/tex]
Explanation:
1) If there are 68.54 grams of silver chloride, first know the chemical formula of silver chloride is AgCl. Then, you can use the molar mass of AgCl, found by adding the molar mass of its constituent elements on the periodic table, and unit conversions to solve for the amount of atoms of AgCl. Keep in mind that Avogadro's number states that there are [tex]6.02 * 10^{23}[/tex] atoms in one mole of a substance. Keep in mind that your answer will have four significant figures.
[tex]68.54 grams AgCl* \frac{1 mol AgCl}{(107.87gAg + 35.45gCl)} *\frac{6.02*10^{23}atoms}{1 mol} = 2.879 atomsAgCl[/tex]
2) If there are [tex]5.64 * 10^{28}[/tex] atoms of bismuth, you can use the molar mass of Bi found on your periodic table and constants in order to calculate the mass of Bi.
[tex]5.64*10^{28}atoms Bi * \frac{1 mol Bi}{6.02 * 10^{23}atoms Bi} * \frac{208.98gBi}{1 molBi} = 1.96 * 10^7gBi[/tex]
4) When asked for the empirical formula, recall that the empirical formula of a compound differs from its chemical formula, as the empirical formula is essentially the "greatest common factor" version of a chemical formula. For example, glucose, [tex]C_{6} H_{12}O_{6}[/tex], and acetic acid, [tex]CH_3COOH[/tex] (or [tex]C_2H_4O_2[/tex]) have different chemical formulas, but their empirical formulas are the same, represented as [tex]CH_2O[/tex], where the greatest common factor 6 is factored out of glucose to obtain this formula, while the greatest common factor 2 is factored out of acetic acid.
Given this information, you can imagine that there are 100g of carbon, hydrogen, and oxygen in this compound, so that the percentages given are easy to convert into mass. (Note that since empirical formula is a simplified form, the molar mass of the compound won't matter). This gives us a compound with 50.0g of carbon, 33.3g of oxygen, and 16.7g of hydrogen. We can then convert those values into moles:
[tex]50.0gC * \frac{1molC}{12.01gC} = 4.16molC\\33.3gO * \frac{1molO}{16.00gO} = 2.08molO\\16.7gH * \frac{1 mol H}{1.01gH} = 16.5molH[/tex]
Now, you can express a formula for this compound as [tex]C_{4.16}H_{16.5}O_{2.08}[/tex].
The lowest of these numbers is 2.08, or the number of moles of O in the formula. Dividing each of the subscripts by 2.08 will result in the following formula:
[tex]C_{4.16/2.08}H_{16.5/2.08}O_{2.08/2.08} = C_2H_8O[/tex]
Note: Depending on if 1.00g/mol or 1.01g/mol was used for the molar mass of hydrogen, either 7.93 or 8.03 would be found to be the subscript of H. This is simply factored out by rounding either value to simply 8.
Bonus) Knowing that there are 25.6g of the substance in question, we can simply find 64.9% (the percent composition by mass of carbon for the unkown compound) of the total mass of the unknown compound.
[tex]25.6g * 0.649 = 16.6gC[/tex]
Now, simply use the molar mass of carbon, 12.01g/mol, to find the moles of carbon present.
[tex]16.6gC * \frac{1molC}{12.01gC} = 1.38molC[/tex]
Now, using Avogadro's number, convert from moles to atoms. Keep in mind that your answer will have three significant figures.
[tex]1.38molC * \frac{6.02*10^{23}atomsC}{1molC} = 8.31*10^{23}atomsC[/tex]
Describe what the Sim evidence shows you about attraction. Remember to use the words attraction, freedom of movement, kinetic energy, and overcome in your response
During change of phase, the molecules of a substance acquire enough kinetic energy to overcome the forces of attraction between its molecules.
What is change of phase?Change of phase occurs when a substance acquires enough energy to overcome the forces of attraction between its molecules to transition from one state of matter to another.
During a change of phase, kinetic energy of the molecules of the substance increases due to the application of heat, and the freedom of movement of the molecules increases.
Change of phase can occur as follows;
from solid to liquid and vice versafrom solid to gas and vice versafrom liquid to gas and vice versaTherefore, during change of phase, the molecules of a substance acquires enough kinetic energy to overcome the forces of attraction between its molecules leading to increased freedom of movement of the molecules.
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Answer:During change of phase, the molecules of a substance acquire enough kinetic energy to overcome the forces of attraction between its molecules.
What is change of phase?
Change of phase occurs when a substance acquires enough energy to overcome the forces of attraction between its molecules to transition from one state of matter to another.
During a change of phase, kinetic energy of the molecules of the substance increases due to the application of heat, and the freedom of movement of the molecules increases.
Change of phase can occur as follows;
from solid to liquid and vice versa
from solid to gas and vice versa
from liquid to gas and vice versa
Therefore, during change of phase, the molecules of a substance acquires enough kinetic energy to overcome the forces of attraction between its molecules leading to increased freedom of movement of the molecules.
Explanation:
What is the mass defect?
A. It is seen as an increase in the masses of daughter elements.
B. It is identified as a missing line on an absorption spectrum.
O C. It is the difference between measured mass and average isotope
mass.
D. It is the difference between nuclear mass and the mass of its
components.
SUB
Mass defect is define as the difference between nuclear mass and the mass of its components.
What is mass defect?As the name suggested that defect in mass of any substance given idea about the mass defect and it will be define as the difference between the atomic mass of an atom and sum of the masses of all constitute particles present inside the nucleus.
Mass of daughter nuclei will take in consideration when only nuclear reaction takes place.Missing line of absorption is not related to the mass, else it is related to the concentration.Difference between measured mass and average isotope is not considered in mass defect because it is calculated for the individual atom not for all isotopes of that atom.Hence it is the difference between nuclear mass and the mass of its
components.
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Please help me on this question
What is the difference between saturated fat and trans fat?
Answer:
The main difference between trans fat and saturated fat is that trans fat raises low-density lipoprotein (LDL) levels and drops high-density lipoprotein (HDL) levels in the blood whereas saturated fat raises both LDL and HDL levels in the blood.
Explanation:
Stay safe fam :)
how would leaving molecular sieves uncapped or in an open beaker for an extended period of time affect their functionality
The molecular sieves absorbing the water in the air is how leaving molecular sieves uncapped for an extended time will affect their functionality.
What is Functionality?This is the ability of a substance to adequately suits its purpose or main functions when used.
The molecular sieves will absorb the water in the air, thereby decreasing their ability to absorb in the experiment is how leaving molecular sieves uncapped for an extended time will affect their functionality.
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Every winter, many individuals tragically die in their sleep due to faulty heaters that leak carbon monoxide (CO) during the night. How does CO poisoning lead to death
Answer:
When too much carbon monoxide is in the air, your body replaces the oxygen in your red blood cells with carbon monoxide.
Explanation:
This can lead to serious tissue damage or even death. As you mentioned.
Which is NOT a blood type?
A
B
C
O
there is no answer to your question because all of the options ARE blood types so there is no telling.
A volatile liquid is one that choose. Quickly so it transitions easily into the choose. Phase.
A volatile liquid is one that reacts quickly so it transitions easily into the ground energy state phase.
Ground energy state refers to the state in which is achieved by something burning all of it's potential energy, so that it is in equilibrium. As an example, an apple falling to the ground from a tree . this is because until it hits the ground, it has potential or otherwise some form of energy to burn, disturbing it's equilibrium.
The reaction between sodium hydroxide and hydrochloric acid is considered which type?.
If 4.5 moles of nitric acid falls into 8000 L of pure water, what will be the change of the pH of the solution? Show all of your work for full credit. (Note that nitric acid dissociates completely and puts in one hydrogen ion for each molecule of nitric acid).
*due soon*
Answer:
3.24
Explanation:
It is known that nitric acid is a strong acid, so it will dissociate completely, resulting in [tex]H^+[/tex] and [tex]NO_3^-[/tex] ions being present in solution. We also know that pure water has a neutral pH due to the chemical equilibrium of [tex]H_2O(l)[/tex] ⇄ [tex]H^+(aq) + OH^-(aq)[/tex] signifying equal parts of hydrogen and hydroxide ions.
Now, we must convert from 4.5 moles of nitric acid to moles of hydrogen. This can be accomplished using unit conversions and the chemical dissociation equation [tex]HNO_3(s) - > H^+(aq) + NO_3^-(aq)[/tex]
[tex]4.5molHNO_3 * \frac{1 mol H}{1 mol HNO_3} = 4.5molH+[/tex]
Then, using the pH equation [tex]-log[H+] = pH[/tex] and the formula for molarity [tex]M = \frac{g}{L}[/tex], we can find the value of [tex][H^+][/tex] and in turn the pH of the resulting solution. Keep in mind that both answers for grams of the hydrogen ion and molarity of the hydrogenion should have two significant figures.
[tex]4.5mol H^+ * \frac{1.01gH^+}{1 mol H^+} = 4.6g H^+\\\frac{4.6gH^+}{8000L sol} = 5.8*10^{-4} M H^+[/tex]
Now the pH equation may be used.
[tex]-log(5.8*10^{-4}) = 3.24[/tex]
Note that logarithmic significant figures dictate that the logarithm of a number with x significant figures will result in a value with x digits after the decimal point, meaning that this answer will have two digits after the decimal point and three significant figures.