[tex]\tt \dfrac{2}{50}\times x=1.8\\\\x=\dfrac{1.8\times 50}{2}=45~apple~seeds[/tex]
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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Read the sentences from the Newsela article, "First All-Female Spacewalk Will Take Place During Women's History Month. "
"'I remember telling my mom at that time, and I never deviated from what I wanted to be. Something about exploration has fascinated me from a young age. "
What is the meaning of deviated?
A: struggled
B: recovered
C: strayed
D: profited
Answer:
C ; strayed
Explanation:
I took the k-12 quiz.
Answer:
C
Explanation:
I TOOK THE TEST
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.
What concentration of OH is required to created a pOH of 1.3.
Answer:
0.0501
Explanation:
OH=10^-poH
OH=10^-1.3
=0.0501
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:
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.
How many moles of h2so4 are needed to completely neutralize 0.0164 mol koh? mol h2so4
Answer: Heyo Kenji Here! Here's your answer- :0.0082 moles
Explanation: Hope this helps!
Have a nice day!
- Kenji ^^
Answer:
0.0082
Explanation:
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
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 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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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:
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]
how many grams is 0.456 mol of CaCO3 ?
Answer:
im not sure if this is right but i got 130.8760584
(keeping in mind that 1 mole is equal to 1 moles CAcO3, or 287.0089 grams.)
i may have rounded it wrong but hope this helps
What best describes the hydrogen atom in a bond such as H-CI?
Answer:
a. a part of ionic bond with Cl
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.
.
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.
Describe how intermolecular forces affect solvation.
Answer:
Solvation is affected by inter molecular forces in a sense that these attractive forces overcome the forces that holds the solute and solvent particles together making the solute particles separate form the solvent particles.
Explanation:
hope this helps
how are primary and secondary pollutants alike?
Answer:
Primary pollutants are emitted from natural or anthropogenic sources directly into the atmosphere, while secondary pollutants result from the chemical reactions or the physical interactions between the primary pollutants themselves or between the primary pollutants and other atmospheric components.
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 substance has a standard enthalpy of formation of zero?.
Answer: In its natural condition, a pure element
The reaction between sodium hydroxide and hydrochloric acid is considered which type?.
BRAINLIEST! PLEASE HELP! To plate gold onto a base metal, the overall reaction is Au+3(aq) + 3e− → Au(s). How many seconds would it take at a current of 3.5 amps to plate out 2.50 grams of gold?
a. 349 s
b. 1049 s
c. 9.5 x 10^-4 s
d. 17.4 s
The required time it would take at a current of 3.5 amps to plate out 2.50 grams of gold is 1,049 seconds.
How do we calculate the required time?According to the faraday's second law, equation to calculate the time will be given below:
W = ZIt, where
W = deposit mass = 2.50 grams
Z = equivalent mass / 96500 = 65.6 / 96500 = 0.000679
I = current = 3.5 amp
t = required time = ?
On putting values in above equation, we get
t = (2.50) / (0.000679)(3.5)
t = 1,054 sec = 1,049 s (approx)
Hence required seconds to plate out 2.50 g of gold is 1,049 sec.
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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.
What is the empirical formula for a compound that has 1. 5 moles of copper and 0. 5 moles of phosphorus
Which reaction is exothermic? ch4 2o2 right arrow. co2 2h2o 891 kj nh4no3 h2o 25 kj right arrow. nh4 (aq) no3-(aq) 2h2o 286 kj right arrow. 2h2 o2 n2 o2 181 kj right arrow. 2no
Answer:
All are Endothermic reaction.
Explanation:
Answer:
CH4 + 2O2 --> CO2 + 2H2O + 891 kJ
Explanation:
Edge
Describe in brief the role of zinc in human body.
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
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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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: