Answer:
I think it's because he was presumed dead after a storm, or like a problem with his suit
Explanation: I think it was because somebody thought he was dead in the storm? And the remaining of the crew were forced to leave him behind thinking he was dead on mars.
I might be right, might not ^^
When a 0.860 g sample of an organic compound containing C, H, and O was burned completely in oxygen, 1.64 g of CO2 and 1.01 g of H2O were produced. What is the empirical formula of the compound?
Answer:
C₂H₆O
Explanation:
Empirical formula is the simplest ratio of atoms present in a molecule. To solve this question we must find the moles of C, H and O in order to find the simplest ratio of this atoms.
To solve this question we must find the moles of C from CO2, moles of H from H2O and moles of O from the difference of masses of C and H and the sample:
Moles C:
1.64g CO2 * (1mol / 44g) = 0.03727 moles CO2 * (1mol C / 1mol CO2) = 0.03727 moles C
0.03727 moles C * (12g / mol) = 0.4473g C
Moles H:
1.01g H2O * (1mol / 18g) = 0.05611 moles H2O * (2mol H / 1mol H2O) =
0.1122 moles H
0.1122 moles H * (1g / mol) = 0.1122g H
Moles O:
0.860g - 0.1122g H - 0.4473g C = 0.3005g O * (1mol / 16g) =
0.01878 moles O
The ratio of the moles of atoms regard to the moles of O (Lower number of moles) is:
C = 0.03727 moles C / 0.01878 moles O = 1.98 ≈ 2
H = 0.1122 moles H / 0.01878 moles O = 5.97 ≈ 6
O = 0.01878 moles O / 0.01878 moles O = 1
Empirical formula is:
C₂H₆OWhen calcium metal is placed in water a vigorous single replacement rection occurs, releasing hydrogen gas. What will happen to the pH of the solution that forms as this chemical reaction proceeds
Answer:
The pH of the solution increases
Explanation:
One of the properties of metals is that they react with water to yield hydrogen gas and the hydroxide of the metal.
Calcium is a metal in group two of the periodic table and also undergoes such reaction.
The equation of the reaction is;
Ca(s) + 2H2O(l) -----> Ca(OH)2(aq) + H2(g)
Since Ca(OH)2 is alkaline, the pH of the solution increases.
Which of the following is a correct statement about water? (3 points)
Hydrogen bonding causes water to be strongly cohesive.
Hydrogen bonding causes water to have a low surface tension.
Water is a universal solvent because polar and nonpolar solutes can dissolve in it.
Water is less dense as a liquid than as a solid because of changes in bond structure.
Answer:
A: Hydrogen bonding causes water to be strongly cohesive.
Explanation:
Water has a high surafce tension. Hence droplets of water
Water cannot dissolve non polar substances like oil; only polar
Water is actually less dense in solid form :)
Hydrogen bonding causes water to be strongly cohesive.
This sticking together of like substances is called cohesion. Depending on how attracted molecules of the same substance are to one another, the substance will be more or less cohesive. Hydrogen bonds cause water to be exceptionally attracted to each other. Therefore, water is very cohesive.
Cohesion
Cohesion, also called cohesive attraction or cohesive force, is the action or property of like molecules sticking together, being mutually attractive. It is an intrinsic property of a substance that is caused by the shape and structure of its molecules, which makes the distribution of surrounding electrons irregular when molecules get close to one another, creating an electrical attraction that can maintain a microscopic structure such as a water drop. In other words, cohesion allows for surface tension, creating a "solid-like" state upon which light-weight or low-density materials can be placed.
Learn more about Cohesion
https://brainly.com/question/18176896
#SPJ2
hellppp i have a quiz please
hindi ko po maintindihan
1 mole of hydrochloric acid reacts with 1 mole of sodium hydroxide to give _______ g of sodium chloride.
Answer:
58,5
Explanation:
Please help me I will give brainliest to the first correct answer
Answer:
OPTIC B) HEPT-HOPE IT IS HELPFUL
What is the mass of oxygen in 1 mole of NaHCO3?
Answer:
48.00
Explanation:
3 oxygen (15.99 x 3)= 48
in which statement are the particles close together and slowly moving past each other
Answer
A-air
B-ice
C-steam
D-water
Answer:
Water particles are close together and move slowly past each other
REALIZAR LA MASA MOLECULAR DE LOS SIGUIENTES COMPUESTOS HIDROXIDO DE MAGNESIO = Mg(OH)2 ACIDO CARBONICO = H2CO3 GLUCOSA= C6H12O6
Answer:
Mg(OH)2 = 58.321g/mol
H2CO3 = 62.026g/mol
C6H12O6 = 180.156g/mol
Explanation:
Para hallar la masa molecular debemos, primero, identificar las moles de cada átomo presentes en una mol de una molécula. Por ejemplo, para el hidróxido de magnesio:
Mg = 1mol
O = 2mol
H = 2mol
Ahora, debemos hacer la suma del peso molecular de todos estos átomos. Esto es:
Mg = 1mol * (24.305g/mol) = 24.305g/mol
O = 2mol * (16g/mol) = 32g/mol
H = 2mol* (1.008g/mol) = 2.016g/mol
El peso molecular del hidróxido de magnesio es:
24.305g/mol + 32g/mol + 2.016g/mol = 58.321g/mol
Ácido Carbónico:
H = 2mol * (1.008g/mol) = 2.016g/mol
C = 1mol * (12.01g/mol) = 12.01g/mol
O = 3mol * (16g/mol) = 48g/mol
Masa molar = 62.026g/mol
Glucosa:
C = 6mol * (12.01g/mol) = 72.06g/mol
H = 12mol * (1.008g/mol) = 12.096g/mol
O = 6mol * (16g/mol) = 96g/mol
Masa molar = 180.156g/mol
A Starting substance in a chemical reaction is called a _______________.
1. reactant
2. product
3. chemical reaction
4. physical reaction
Answer:
1.)REACTANT
These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.organs are directly made up of what lower level of cellular organization
Answer:
hwejfhwefefewf
Explanation:
efwffhhfghr
Increasing temperature makes a
reaction rate faster. Which of the
following best explains the above?
A. high-temperature meltdown
the reactants so it is easier to
react
O
B. High temperature increases
the number of high energy
collisions
C. reactants can evaporate
when they are heated up
D. Products favor higher
temperature reactants.
Answer:
High temperature increases the number of high energy collisions
Explanation:
Increasing the temperature a reaction takes place at increases the rate of reaction. At higher temperatures, particles can collide more often and with more energy, which makes the reaction take place more quickly.
An electric current is produced when ______________________ move continuously batteries magnets electric charges wires
Answer:
electric charges.
Explanation:
Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction.
An electron can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
An electric current is produced when electric charges (electrons) move continuously and it's measured in Amperes through the use of an ammeter.
Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.
Mathematically, Ohm's law is given by the formula;
[tex] V = IR[/tex]
Where;
V represents voltage measured in voltage.
I represents current measured in amperes.
R represents resistance measured in ohms.
Is this an alpha or beta decay?
what physical and social systems are involved in the service industry
Answer:
Hey mate.....
Explanation:
This is ur answer........
For example, the communications industry includes all of the physical and social systems that produce books, newspapers, magazines, radio and television broadcasts, billboard advertisements, Internet websites, telephones, and telecommunications, such as the GPS.
Hope it helps!
Brainliest pls!
Follow me! :)
Tipo de enlace en los compuestos. Compuesto /Electronegatividad Elemento 1/Electronegatividad Elemento 2/ Diferencia de electronegatividad (resta) Tipo de enlace CO2 KCl H2O
Answer:
Tipo de enlace enlace en CO2 - Covalente
Tipo de enlace enlace en KCl - iónico
Tipo de enlace enlace en H2O: enlaces covalentes y de hidrógeno
Electronegatividad de CO2 - Diferencia en electronegatividad de carbono (EN = 2.5) y oxígeno (EN = 3.5) = 3.5 - 2.5 = 1
Diferencia en electronegatividad de KCl = 3,2 -0,8 = 2,4
Diferencia en electronegatividad de H2O = 3.5 -2.1 = 1.4
Explanation:
Tipo de enlace enlace en CO2 - Covalente
Tipo de enlace enlace en KCl - iónico
Tipo de enlace enlace en H2O: enlaces covalentes y de hidrógeno
Electronegatividad de CO2 - Diferencia en electronegatividad de carbono (EN = 2.5) y oxígeno (EN = 3.5) = 3.5 - 2.5 = 1
Diferencia en electronegatividad de KCl = 3,2 -0,8 = 2,4
Diferencia en electronegatividad de H2O = 3.5 -2.1 = 1.4
The rate of gas diffusion is ---Select--- proportional to temperature because a higher temperature means a/an increase in the kinetic energy of molecules. The rate of gas diffusion is ---Select--- proportional to the molecular weight of the gas because gas particles with higher masses require ---Select--- energy to move compared to gas particles with lower masses.
Answer:
The rate of gas diffusion is directly proportional to temperature
Explanation:
The rate of gas diffusion is
a) directly proportional to square root of temperature
b) inversely proportional to the square root of density
c) directly proportional to pressure
d) inversely proportional time and square root of molecular mass
Thus, option A is correct
What happens when the limiting reactant of a reaction runs out?
O excess reactants begin combining.
O reaction stops
O reaction slows down.
O reaction speeds up.
a dry cell produces_______ electricity.
A) static
B) current
Answer:
dude! it's static!
Explanation:
a dry cell can't function and is therefore static!
Determine the mass of NaCl needed to create a 500. ml solution with a concentration of 1.50 M.
How many joules of heat is needed to heat 68.00 grams of aluminum foil from 55.00 °C to 93.00 °C if aluminum has a specific heat of 0.90 J/g °C? 2871 J 9058 J 2326 J 3420 J
Answer:
2326 J
Explanation:
93-55
You get the temperature increased.
Then the answer (x)
Mass *(x) *specific heat
Which layer of the earth is the thinnest and thickest?
Answer:
crust
Discuss with the whole class what the relative thicknesses of the layers are — that the inner core and outer core together form the thickest layer of the Earth and that the crust is by far the thinnest layer.
Explanation:
Discuss with the whole class what the relative thicknesses of the layers are — that the inner core and outer core together form the thickest layer of the Earth and that the crust is by far the thinnest layer.
what is ionic compounds??
Answer:
The ionic compounds are chemical compounds composed of ions, which is held together by electrostatic forces termed ionic bonding.
A student used the Dumas method to
determine the molar mass of a volatile
material. They placed the container into the
ice bath BEFORE all of the material was
vaporized. What will happen to their final
calculations?
A. The Molar Mass will be too low.
B. The Molar Mass will not be effected.
C. The Molar Mass will be too high.
Answer:
B. The molar Mass will not be effected
Explanation:
HIPE IT HELPS
PLEASE ANSWER!!!!!!!!!!!!!
Please help me on this question
Why study science?
Lmk ASAP
What volume (in mL) of 0.415M silver nitrate will be required to precipitate as silver bromide, all bromide ions in 35.0 mL of 0.064M of calcium bromide?
2AgNO3(aq) + CaBr2(aq) → 2AgBr(s) + Ca(NO3)2(aq)
a
3.04 mL
b
10.8 mL
c
21.6 mL
d
43.2 mL
Answer:
im pretty sure its d
Explanation:
The volume (in mL) of 0.415M silver nitrate will be required to precipitate as silver bromide is 10.8ml , option B is the correct answer.
What is Molarity ?
Molarity is defined as the amount of solute (in moles)in per litre of solution.
It is also known as molar concentration of a solution , It is expressed in mol/l .
[tex]\rm M=\dfrac{n}{V}[/tex]
where n is the number of moles
and V is the volume in litres.
We can rearrange this equation to get the number of moles:
n= M * V
The molarity of calcium bromide is 0.064 M and the volume given is 35 ml,
the moles will be n = 0.064 * 35 = 2.24 moles
2AgNO₃(aq) + CaBr₂(aq) → 2AgBr(s) + Ca(NO₃)₂(aq)
From the reaction we can see that for every 1 mole of Calcium Bromide 2 moles of Silver Nitrate is needed , so for 2.24 moles 4.48 moles will be needed.
The molarity is given as 0.415 M and the number of moles is 4.48 so the volume required can be calculated from the above formula
[tex]\rm V=\rm\dfrac{n}{M} \\\\V=\rm\dfrac{4.48}{0.415} \\\\V= 10.8 ml\\[/tex]
Hence the volume (in mL) of 0.415M silver nitrate will be required to precipitate as silver bromide is 10.8ml , option B is the correct answer.
To know more about Molarity
https://brainly.com/question/2817451
#SPJ2
1 An
atom
has 20
number?
with 39
neutron
mass number
it's
atomic
yes it is atomic if the mass number is that high
how do valence electrons interact between non polar covalent, polar covalent, and ionic bonds?
Answer:
In non-polar covalent bonds, the electrons are equally shared between the two atoms. For atoms with differing electronegativity, the bond will be a polar covalent interaction, where the electrons will not be shared equally.
Explanation:
i did some reasherch so there^^