Answer:
0.0199moles
Explanation:
The number of miles of a substance can be calculated using the formula:
Number of moles (n) = Mass (M) / Molar mass (MM)
In this question, the mass of Magnesium element (Mg) = 0.478 g while the atomic mass is 24
Therefore, number of moles of Magnesium is:
Moles = 0.478/24
Moles = 0.01992
Hence, 0.0199 moles of Magnesium are contained in 0.478 g of the element.
P +
Cl2 →
PC13
Balance the chemical equation
Answer:
2P + 3Cl2 => 2PCl3
Explanation:
how does the structure of atoms (i.e. protons, neutron, and electrons) affect the electric charge of an object or substance.
Electrons contribute greatly to the atom's charge, as each electron has a negative charge equal to the positive charge of a proton. Scientists define these charges as “+1” and “-1. ” In an uncharged, neutral atom, the number of electrons orbiting the nucleus is equal to the number of protons inside the nucleus.:
What are water and carbon dioxide in the cellular respiration reaction? They are reactants because they are present before the reaction. They are reactants because they are present after the reaction. They are products because they are present before the reaction. They are products because they are present after the reaction.
Answer:
They are products because they are present after the reaction.
Explanation:
A chemical reaction refers to any interaction between two or more chemical species that leads to the formation of new chemical species. The species that interacted with each other are called reactants. They were present before the reaction commenced. The species that were formed after the interaction are called products. They only appear after the reaction.
In cellular respiration, carbon dioxide and water appear after the chemical reactions that take place, hence they are products.
Answer:
They are products because they are present after the reaction.
Explanation:
define Idea gas law
Answer:
P1*V1/T1=P2*V2/T2
I think this will help you
How is a mixture different from a pure substance?
A. Pure substances are made up of mixtures.
B. A pure substance is heterogeneous.
C. A mixture is made of one substance.
D. Mixtures can be separated by physical means.
Answer: ITS D
Explanation: i was just looking answers for my test and this is my sisters account
Iron (Fe) is an effective conductor of heat and electricity. Which other element is MOST likely to
have similar conductivities?
(A) potassium (K)
(B) nickel (Ni)
(C)bromine (Br)
(D) krypton (Kr)
Answer:
B
Explanation:
Conductors are able to conduct electricity and temperature. Most of the metals, metalloids and alloys are conducting. Like iron (Fe) nickel is a good conductor.
What is conductivity?Conductivity is a physical property of substances indicates the ability to conduct heat and electricity. Substances like metals are conductors because of the presence of free electrons in them.
The flow of free electrons in solids make the substance conducting. Substances which does not conduct is called insulators and those which conduct partially is called semiconductors.
Gases and liquids with fewer electrons are not conducting. Thus bromine is not a conductor. Krypton is a noble gas and is not conducting, potassium does not conduct electricity but it is thermally conducting.
Hence nickel (Ni) is the element having similar conductivity of iron. Thus option B is correct.
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Which of the following are NOT SAFE things to do, as we might get an electric shock?
1) Touching the switch of a geyser with dry hand.
2) Standing on a wooden stool to check a plug point.
3) Poking a metal rod into an electrical socket.
4) Touching the water in which an immersion heater is kept.
1 is the answer cuz why not
Answer:Poking a metal rod into an electrical socket.
Explanation:
It is because metal rod can conduct electricity easily. So while poking, the metal rod will conduct electricity and you will get an electrical shock.
what is the second most common molecule in the body
Answer:
carbon
Explanation:
Answer:
Carbon
Carbon is the second most common molecule in the human body
Choose all the answers that apply, The cardiovascular system transports material for the _____.
Answer:
vines or body vessels
Explanation:
Veins are vessels of the circulatory system that support circulation by conveying blood to the heart. Blood flowing through the circulatory system transports nutrients, oxygen, and water to cells throughout the body.
Answer: Respiratory system.
Explanation: The cardiovascular system transports oxygen and carbon dioxide for the respiratory system. Not the best explanation but I hope this help ya, good luck! ;D
Bismuth has a density of 9.80 g/cm^3. What is the mass of 3.02 cm^3 bismuth?
Answer:
Now, the problem provides you with the density of bismuth metal, which is said to be equal to 9.8 g cm−3 . This tells you that for every cubic centimeter of bismuth, you get a mass of 9.8 g .
How many formula units of sodium chloride are in 6.25moles?
Answer:
3.76375 * 10 ^24
Explanation:
1 mole of Nacl contains 6.022 * 10^23 Nacl formula units
How many atoms of nitrogen (N) on in (NH3)3PO4
Answer:
i think 3 but im sorry if im wrong
Explanation:
8. What is dangerous about ultraviolet (UV) light?
Answer:
it's dim and might damage the eye sight of a person
Explanation:
thats my thought
chemical bond where electrons are shared and usually formed between two nonmetals
Are famers better than teachers
Answer:
yes and no
Explanation:
because farmers produce grains
and teachers produce knowledge than
how can we measured them?
Answer:
NO... I THINK... ACCORDING TO ME... BY GAINING KNOWLEDGE BY TEACHER.... WE CAN ABLE TO CHANCE FARMING SYSTEM...
BUT FARMER ONLY DO FARMING...
FOLLOW ME..
An airplane travels with a constant velocity of 210 m/s and in the upper atmosphere where the plane is traveling there is a wind that is blowing at a constant velocity of 60 m/s to the east. Determine the resultant velocity for the plane when it is traveling
Answer:
hello your question is incomplete the options are missing
Determine the resultant velocity for the plane when it is travelling
i) To the east
ii) To the west
answer :i) 270 i
ii) -150 i
Explanation:
velocity of Airplane = 210 m/s
wind velocity = 60 m/s to the east
The resultant velocity for the plane when it is travelling
let the velocity of the wind = V2
velocity of the plane = v1
i) The resultant velocity for the plane when travelling to the east
Vr = V2 i + V1 i
Vr= 60i + 210i = 270i
ii) resultant velocity when the plane is travelling to the west
Vr = - V1 i + V2i
= -210i + 60 i = -150 i
Which scientist discovered the neutron and gave us the current basic model of
the atom?
A James Maxwell
B John Dalton
C James Chadwick
D Sir Isaac Newton
Answer:
c
Explanation:
i read a artical on him and it said
love yall;]
Which of these processes occur when water changes to ice?
Please answer the following questions with the proper significant figures:
[You are welcome to use calculator. Just remember that calculator doesn't do sig fig for you]
a) (32.670+1.2204)-14.0 =
b) 12.080 x 4.050 x 0.231 =
c) (3.051 x 103) x (2.00 x 10-2) =
a)32.670 + 1.2240 = 33.8904
33.8904-14.0 = 19.8904
b)12.080 × 4.050 × 0.231
=54.36 × 0.231
=12.55716
c)(3.051 × 103) ×(2.00 × 10.2)=
314.253 × 20.4 = 6410.7612
At 170C, a sample of hydrogen gas occupies 125cm3. What will be the volume at 1000C? =161cm3 If the volume of a given mass of gas at 00c is 27.3cm3. What will be the volume of the gas at 100c, pressure remaining constant? (a) 2.73cm3 (c) 28.3cm3 (c) 37.3cm3 (d) 273cm
1. V= 161
2. V = 37.3
Further explanationCharles's Law states that
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V1}{T1}=\dfrac{V2}{T2}[/tex]
1.
[tex]\tt \dfrac{125}{17+273.15~K}=\dfrac{V2}{100+273.15}\\\\V2=160.7\rightarrow 161~cm^3[/tex]
2.
[tex]\tt \dfrac{27.3}{0+273.15`K}=\dfrac{V2}{100+273.15}\\\\V2=37.3~cm^3[/tex]
HELP!! Worth 16 points
Answer:
I believe the boiling point is 102 degrees Celsius and the freezing point is -2 degrees Celsius (so C).
Explanation:
Gas has a higher entropy than liquid, who has a higher entropy than solid. If a solid melts or a liquid vaporizes, the entropy increases. If a solute is present, it also contributes to the entropy of the mixture. The liquid already has a higher entropy (molecule randomness or disorder) than the pure liquid, so there's less likelihood of forming gas. This, therefore, means that it has a higher boiling point. This randomness also opposes freezing. A lower temperature has to reached before balance between solid and solution reached. So, the freezing point is lower.
Please let me know if I'm incorrect :)
Some power plants burn coal to produce electricity. The energy released from coal being burned is used to change water into steam. The steam spins turbines of large generators that produce electricity. Which energy transformations occur when coal is used to produce electricity?
Answer:
Steam thus released transforms heat energy from burning coal into mechanical energy that in turn spins the turbine engine. The kinetic energy of the spinning turbine does work in a generator and then the generator that turns this work into electric energy.
Explanation:
Power plants burn coal to produce electricity. The energy released from coal being burned is used to change water into steam. Steam thus released transforms heat energy from burning coal into mechanical energy that in turn spins the turbine engine. The kinetic energy of the spinning turbine does work in a generator and then the generator that turns this work into electric energy.
The diagram is a model of a molecule of methane. What is the formula for methane?
Answer:
CH4
Explanation:
Grade
An aqueous solution of blue copper(II) ions can react with chloride ions to form a yellow
7-9
copper compound. The ionic equation for this reaction is: Cu2+ + 4C [CuCl]
-.1 The forward reaction is endothermic. What two things can you say about the enthalpy change for
the reverse reaction?
Answer:
pp
Explanation:
help wit science thanks !
Answer:
Possibly
Explanation:
what is 2 + 2 + 2 -8-9-100
The Answer is:
-111.0
The half-life of Co-59 is 35 days. How much of a 610.0-gram sample will remain after 140 days?
Answer:
Amount left after 140 days is 38.125 g.
Explanation:
Given data:
Half life of Co-59 = 35 days
Total mass of sample = 610.0 g
Sample remain after 140 days = ?
Solution:
Number of half lives passes during 140 days:
Number of half lives = T elapsed / Half lives
Number of half lives = 140 days / 35 days
Number of half lives = 4
Amount left:
At time zero = 610 g
At first half life = 610 g/2 = 305 g
At second half life = 305 g/2 = 152.5 g
At 3rd half life = 152.5 g/2 = 76.25 g
At 4th half life = 76.25 g /2 =38.125 g
Amount left after 140 days is 38.125 g.
What conclusion can you draw about the ability of metals to hold on to and attract electrons, as
compared to nonmetals?
Answer:
Metals react by losing electrons. So, there is high reactivity due to lower attraction. Non-metals react by gaining electrons. So, there is high reactivity due to higher attraction.
Explanation:
Metals react by losing electrons. So, there is high reactivity due to lower attraction. Non-metals react by gaining electrons. So, there is high reactivity due to higher attraction. Also, electrons lost by metals transfer to the nonmetals. It is easier for the metals to lose their valance electrons and form cations rather than gaining electrons.
Metals do not hold on to or attract electrons while nonmetals hold on to or attract electrons.
In the periodic table, metals are found towards the left hand side of the table while nonmetals are found towards the right hand side of the table.
Electron affinity of elements increase from left to right across the period. Electron affinity refers to the ability of elements to attract or hold electrons. This ability increase steadily across the period.
Usually, the electron affinity values of nonmetals are very high showing that they easily hold on to and attract electrons while the electron affinity values of metals is very low showing that they do not easily hold on to and attract electrons.
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Which term is testable, a prediction, and can be supported or refuted by data?
hypothesis
theory
law
publication
Answer:
answer is A. Hypothesis on edge 2020
Explanation:
have a great day peeps :)
How many moles of iron(III) oxide are produced from 3.0 moles of oxygen and excess Iron Sulfide as described by the chemical equation below? 4FeS + 502 → 2Fe2O3 + 4502
The moles of iron(III) oxide are :
- 4 moles
"Moles Concept"Given:
moles of Fe (iron) = ?
moles of Oxygen (O₂) = 3.0 moles
Reaction :
4Fe + 3O₂ --------> 2Fe₂O₃
4Fe + 3O₂ ----------> 2Fe₂O₃
4 mole +3 mole
Unity formula:
4 mole of iron (Fe) ≅ 3 moles of oxygen (O₂)
??mole of iron (Fe) ≅ 3.0 moles of oxygen (O₂)
Cross multiplication:
moles of iron (Fe) = 3.0 moles *4 mole/ 3 moles
moles of iron (Fe) = 4 moles
moles of iron(III) is 4 moles produced from 3.0 moles of oxygen.
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