Answer:
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What percentage of the total atomic mass of magnesium bromide (MgBr2) is composed of bromine? Hint - consider the mass of both atoms of bromine in your calculation. A.43% B.87% C.13% D.63%
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(1)
How many moles of iron can be made from 3 moles of Fe2O3?
ANSWER - 6 MOLES OF IRON
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(1)
One moles of Fe2O3 forming 2 moles of Fe
3 moles of Fe2O3 will form 2×3 = 6 moles of iron
The table below gives some characteristics of element Y
what is the identity of Y
Answer:
I doint understand that question resend it again
List at least three different properties that would help you determine whether the bars are made of the same metal.
Answer:
Refractive index
Heat capacity
Density
Explanation:
Properties that are used to identify materials are called intensive properties. These intensive properties are characteristic of the material and does not depend on the amount of material present.
Thus, if i want to identify whether the three bars are made of the same metal, i can look out for the following properties;
Refractive index
Heat capacity
Density
These properties are intensive properties thus they can be used to identify an unknown substance.
What mass of methanol (CH3OH) is produced when 140.1 g of carbon
monoxide reacts with 12.12 g of hydrogen?
CO(g) + 2H2(g) → CH2OH()
A. 160.2g
B. 96.12 g
C. 6.06 g
D. 192.2g
Answer:
B. 96.12 g
Explanation:
To solve this question we must convert each reactant to moles. Using the balanced equation we can find limiting reactant. With moles of limiting reactant we can find the moles of methanol and its mass:
Moles CO -Molar mass: 28.01g/mol-
140.1g CO * (1mol / 28.01g) = 5.0 moles CO
Moles H2 -Molar mass: 2.01g/mol-
12.12g * (1mol / 2.01g) = 6.03 moles H2
For a complete reaction of 5.0 moles of CO are required:
5.0moles CO * (2mol H2 / 1mol CO) = 10.0 moles of H2 are required
As there are just 6.03 moles, H2 is limiting reactant.
The moles of methanol produced are:
6.03 moles H2 * (1mol CH3OH / 2mol H2) = 3.015 moles CH2OH
Mass CH3OH -Molar mass32.04g/mol-:
3.015 moles CH2OH * (32.04g/mol) =
96.6g CH3OH ≈ B. 96.12 g
which environment would experience more humidity
A: Desert
B: Grassland
C: Mountain
D: Swamp
Answer:
Explanation:
You'r answer should be D
Banda se los agradeceria de corazon si me ayudarian con esta tarea :c
FORMULE LAS SIGUIENTES ECUACIONES QUÍMICAS INDIQUE: ELEMENTO QUE SE OXIDA, REDUCE AGENTE OXIDANTE Y AGENTE REDUCTOR.
a. Cinc + ácido clorhídrico produce cloruro de cinc + hidrógeno molecular
b. Sodio + ácido sulfúrico produce sulfato de sodio + hidrógeno molecular
c. Hidróxido de calcio + ácido carbónico produce carbonato de calcio + agua
Answer:
ver explicacion
Explanation:
Zn (s) + 2HCl (ac) ---> ZnCl2 (ac) + H2 (g)
El zinc se oxida y el hidrógeno se reduce. HCl es el agente oxidante mientras que Zn es el agente reductor.
2Na (s) + H2SO4 (ac) ----> Na2SO4 (ac) + H2 (g)
El Na se oxida y el hidrógeno se reduce. El ácido sulfúrico es el agente oxidante, mientras que el sodio metálico es el agente reductor de tge.
Ca (OH) 2 (ac) + H2CO3 (ac) ------> CaCO3 (s) + 2H2O (l)
Esta no es una reacción redox ya que no hay cambios en el número de oxidación de izquierda a derecha.
(reply if you know the answer or get reported) How many atoms are there in 5 grams of silicon?
Similarly, for one gram atomic weight of silicon with atomic weight of 28 grams, one mole of silicon still contains 6.022 × 1023 silicon atoms.Answer:
Explanation:
hope it helps
What kind of chemical bond exists between two nitrogen atoms to form nitrogen gas? Is this a strong or weak bond? When a chemical bond is formed, is energy absorbed or released?
Answer:
pure covalent bond ( inter atomic bond)
Explanation:
pure covalent exists between atoms of the same kind..two nitrogen atoms have the same electronegativity values hence cancel out making it a pure or non polar covalent bond
Is 22.99 mol of Na equal or not equal to Avogadro's number?
Answer:
It is not equal to Avogadro constant
Explanation:
This is because Avogadro constant refer to the number of molecules or atoms of particles per mile substance and thus is equal to 6.022×10^23 per mile or unit of that substance.
Use the periodic table to identify the noble gas that would be included in the noble-gas notation for each of the following elements.
Si:
Fr:
Hg:
V:
Answer:
silicon
francium
mercury
vanadium
Answer:
Si:
✔ Ne
Fr:
✔ Rn
Hg:
✔ Xe
V:
✔ Ar
Explanation:
A sinkhole is a depression that forms in the ground as the surface layer slowly or quickly collapses. Rainwater is naturally a weak acid.
Most of the acid in the rainwater is carbonic acid which reacts with limestone and changes it into a new substance. The new substance
dissolves in the water which drains away. This leaves cracks and holes underneath the surface that can collapse. The formation of one
type of sinkhole is shown below.
topsoil
limestone
"hain
rain
pond
Rainwater dissolves some
limestones
and carries some
of the new solution away. This
forms cracks which results in
a small depression
The dissolving of the limestone
makes bigger cracks. The cracks
are fitted with topsoil and a pond
forms
3
Underneath a sinkhole, cracks can lead to other areas where the limestone has been dissolved. A much larger hole is formed by
the same processes of chemical weathering and erosion. What does this most likely form?
O A. a delta
B.
a lake
C.
a cave
D.
a coastline
Answer:
b
Explanation:
I'm guessing don't hold me to it
Answer: 3. C) a cave
Explanation:
A sinkhole is a hole in the ground caused by the decline of water levels and disturbance of the soil. If you'd like to imagine how it looks, search "sinkhole".
If a sinkhole occurs, more cracks form and the hole itself becomes larger, what do you expect would happen?
The formation could become a cave.
The answer is C. A cave.
Hope this helps!
Un gas a una temperatura de 38°C, tienen un volumen de 21 Lts Litros. ¿Qué volumen tendrá si la temperatura sube a 67°C?.
Answer:
. ¿Qué
Explanation:
Hope you have a great day
Se encuentra en los animales marinos, es un gas incloro de olor desagradable muy parecido al del pescado podrido
Answer:
Metilaminas
Explanation:
Las metilaminas a menudo están presentes en los tejidos corporales de organismos marinos como crustáceos, moluscos y en todos los peces marinos como N-óxido de trimetilamina, donde actúan para estabilizar la proteína que se desestabiliza por la presión y también se cree que actúa como un depresor del punto de congelación. en peces polares
Las metilaminas tienen olor a pescado podrido, basura o huevos podridos, de modo que una acumulación de metilamina en el cuerpo da como resultado la liberación de un olor a pescado en la amplitud, el sudor y la orina de un individuo
2.00 liters of gas at 1.00 atm and conpresssed it to a pressure of 6.00 atm, what would the volume of the gas be
Answer:
[tex]V_2=0.5L[/tex]
Explanation:
From the question we are told that:
initial Volume [tex]V_1=2.00L[/tex]
initial Pressure [tex]P_1=1 atm[/tex]
Final Pressure [tex]P_2=6atm[/tex]
Generally the equation for Final Volume V_2 is mathematically given by
Since Boyle's law states
[tex]P_1V_1=P_2V_2[/tex]
[tex]V_2=\frac{P_1V_1}{P_2}[/tex]
[tex]V_2=\frac{2*1}{6}[/tex]
[tex]V_2=0.5L[/tex]
A radioactive sample has an activity of 450 cpm three half lives after the initial activity was determined. What was the original activity?
Answer:
original activity is 3600 cpm
Explanation:
3 half-lives = 450 cpm
2 half-lives = 900 cpm
1 half-life = 1800 cpm
answer = 3600 cpm
Tides are caused by the pull of gravity by the _____ and the _____.
(fill in the blanks)
tides are caused by the gravitational force of the sun and the moon
When 0.215 mol of a gas is placed into a 34.25 mL container at 125.0°C, 1
it will exert a pressure on the container. Justin has been asked to
calculate the pressure that this gas will exert on the container in kPa, then
to
go into the lab and measure this pressure.What will he determine is the
pressure of the gas?
Answer:
205.12 atm
Explanation:
Using the ideal gas law equation:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
R = 0.0821 Latm/perK)
T = temperature (K)
n = number of moles (mol)
According to the information in this question;
P = ?
V = 34.25 mL = 34.25 ÷ 1000 = 0.03425L
n = 0.215 mol
T = 125.0°C = 125 + 273 = 398K
Using PV = nRT
P = nRT ÷ V
P = (0.215 × 0.0821 × 398) ÷ (0.03425)
P = 7.025 ÷ 0.03425
P = 205.12 atm
periods occurred during the Mesozoic Era?
Which examples are part of the hydrosphere?
Answer:
some water trapped under the earth
Explanation:
The hydrosphere includes water that is on the surface of the planet, underground, and in the air.
Answer:
C and D
Explanation:
The hydrosphere consists of anything to do with water, so a large glacier and some water trapped in the earth are examples of parts of the hydrosphere.
What is the energy transformation from wind to usable energy
Answer:
A turbine takes the kinetic energy of a moving fluid, air in this case, and converts it to a rotary motion.
Explanation:
8. Skin cancer is a disease that occurs when skin cells grow in an uncontrolled way. It can be caused by UV
light, which can alter the genetic sequence of skin cells. Which choice below best describes how UV
light might cause skin cancer?
a. UV light changes the genetic code that makes the proteins in the skin cell. The new code
changes the structure and function of these proteins. When the proteins that control cell
growth change in a way that makes them no longer work, cancer is the result.
b. UV light changes the shape of the proteins in the skin cells. These proteins change the
genes in the cell. This makes the cell grow uncontrollably resulting in cancer.
C. UV light makes skin cells grow faster. Overtime, the skin cells adapt to the UV light by
growing faster and faster. Eventually they grow so fast that their growth is no longer
controlled, this results in cancer.
d. None of the above.
Answer:
Explanation:
I think none of the above, because when caused by a UV light it damages the cells. And if enough builds up overtime it causes uncontrollable growth and leads to skin cancer.
Hope that helped? It might be another answer honestly.
calculate the volume occupied by 15 moles of a gas at 1.14 atm and 265K. A-286.3L B-321.6L C-247.4L D-304.5L
Answer:
A- 286.3L
Explanation:
Using the ideal gas law equation;
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
According to the information given in this question;
P = 1.14atm
V = ?
n = 15moles
T = 265K
Using PV = nRT
V = nRT ÷ P
V = (15 × 0.0821 × 265) ÷ (1.14)
V = 326.35 ÷ 1.14
V = 286.27 L
V = 286.3L
Which of the following substances will form a base when dissolved in water?
A)
SO2
B)
HBr
C)
HCl
D)
KOH
Answer:
S02
Explanation:
Based on it
it cause the base when dissolving in water
How is an alkoxide ion formed??
Which type of substance ionizes partially and gives off hydrogen ions when dissolved in
water? (5 points)
Weak base
weak acid
Strong acid
Strong base
Answer:
strong acid
Explanation:
Race car
Mass is 1250 kilograms
Velocity is 2.3 m/s
What is the momentum?
[tex]mass \: of \: the \: car \: = 1250 \: kg \\ \\ velocity \: of \: the \: car \: is \: = 2.3m/s \\ \\ formula \: to calculate \: momentum \: \\ \\ \: \: \: \: p = mv \: \: \: (m = mass \: and \: v = velocity) \\ \\ momentum \: = 1250 \times 2.3 = 2875m/s[/tex]
What does it mean if an element has 8 valence electrons?
Answer:
the answer is the D, it has a full octet
need help asap electrons
positively charged, subatomic particles found in the nucleus of the atom
2. metals
elements with properties intermediate between those of metals and nonmetals
3. period
a homogeneous mixture whose particles are too small to reflect or scatter light
4. compound
two or more elements that have chemically combined
5. solution
elements that are malleable, polish to a luster, conduct heat and electricity well and tend to lose electrons in a chemical reaction
6. protons
a vertical column on the periodic table
7. group
a horizontal row on the periodic table
8. metalloids
negatively charged, subatomic particles
Answer:
need help asap electrons
positively charged, subatomic particles found in the nucleus of the atom
2. metals
elements with properties intermediate between those of metals and nonmetals
3. period
a homogeneous mixture whose particles are too small to reflect or scatter light
4. compound
two or more elements that have chemically combined
5. solution
elements that are malleable, polish to a luster, conduct heat and electricity well and tend to lose electrons in a chemical reaction
6. protons
a vertical column on the periodic table
7. group
a horizontal row on the periodic table
8. metalloids
negatively charged, subatomic particles
Explanation:
If Beryllium were to lose a proton, it would become a(n)
Answer:
an anion
Explanation:
since it lost a proton..it now has 3 protons and four electrons and possesses a minus charge since it is no longer neutrally charged..this minus charge makes it an anion
