2Mg(s)+O₂(g)⇒2MgO(s)
Further explanationEqualization of chemical reactions can be done using variables. Steps in equalizing the reaction equation:
1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc.
2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product
3. Select the coefficient of the substance with the most complex chemical formula equal to 1
Reaction(syntesis / combination)
Mg(s)+O₂(g)⇒MgO(s)
give coefficient
aMg(s)+bO₂(g)⇒MgO(s)
Mg, left=a, right 1⇒a=1
O,left=2b,right 1⇒2b=1,b=0.5
Mg(s)+0.5O₂(g)⇒MgO(s) x 2
2Mg(s)+O₂(g)⇒2MgO(s)
The Law of Superposition allows us to determine:
a
which rock layers are the oldest
b
the relative age of layers of rocks and the fossils in them
c
the exact or absolute age of rock layers
d
a and b are correct
Answer:
d . a and b are correct
Explanation:
The law of superposition allows us to determine the age of rock layers and also that of the fossils within them.
The law of superposition states that "in an undeformed sequence of strata, the oldest rock layer is at the bottom and the youngest is on top".
Using this law, geochronologists can determine the relative ages of rock layers. The youngest layer will be found on top. The oldest at the bottom of the sequence. The arrangement of the layers and the fossils there in can also tell us about the ages of the fossils themselves.You have a flexible helium balloon filled with 0.100 mol of gas that is 2.10 L at a certain temperature and pressure. If you deflate the balloon at, constant temperature and pressure, so that it is now only 0.700 L, how many mol of gas are remaining in the balloon?
Answer:
0.033 mole
Explanation:
The following data were obtained from the question:
Initial mole (n1) = 0.1 mol
Initial volume (V1) = 2.1 L
Final Volume (V2) = 0.7 L
Final mole (n2) =?
Since the temperature and pressure is constant, then the number of mole remaining in the balloon can be obtained by using the following formula as illustrated:
V1 /n1 = V2 /n2
2.1/0.1 = 0.7/n2
21 = 0.7/n2
Cross multiply
21 × n2 = 0.7
Divide both side by 21
n2 = 0.7/21
n2 = 0.033 mole
Thus, 0.033 mole of the gas is remaining in the balloon.
Given the unbalanced combustion equation: C3H8 + O2 → CO2 + H2O, how many moles of carbon dioxide are produced when 64.0 g of oxygen is reacted with excess propane?
Moles of Carbon dioxide : 1.2
Further explanationA reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction(balanced)
C₃H₈ + 5O₂=> 3CO₂ + 4H₂O
mol of O₂ :
[tex]\tt \dfrac{64}{32}=2[/tex]
mol of CO₂ :
[tex]\tt \dfrac{3}{5}\times 2=1.2[/tex]
Using the balanced reaction below, drag and drop the terms into the correct location to solve the following problem:
If 1.5 moles of ethanol (C2H5OH) react, how many moles of water will be formed?
2 C2H5OH + 7 O2 --> 4 CO2 + 6 H2O
Answer:
4.5 moles of H2O.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
C2H5OH + 3O2 —> 2CO2 + 3H2O
From the balanced equation above,
1 moles of C2H5OH reacted to produce 3 moles of H2O.
Finally, we shall determine the number of mole of H2O produced by the reaction of 1.5 moles of C2H5OH. This can be obtained as follow:
From the balanced equation above,
1 moles of C2H5OH reacted to produce 3 moles of H2O.
Therefore, 1.5 moles of C2H5OH will react to produce = 1.5 × 3/ 1 = 4.5 moles of H2O.
Thus, 4.5 moles of H2O will be produced.
Which statement best describes SARS? SARS was an epidemic, but not a pandemic. SARS was a pandemic, but not an epidemic. SARS was both a pandemic and an epidemic. SARS was neither a pandemic nor an epidemic
Answer:
SARS was an epidemic, but not a pandemic.
Explanation:
It is correct to say SARS was an epidemic but not a pandemic.
An epidemic is an outbreak of infectious diseases which affects a group of people in a particular areasA pandemic is a global outbreak of diseases that affects the total population of people over a wider range.SARS outbreak occurred between 2002 - 2004 in China. It was localized to the People's republic and hence, an epidemic.
The recent outbreak of disease in 2020 on the other hand is a pandemic. The infectious disease had a global coverage.
Answer:
sars was an epidemic , but not an pandemic
Explanation:
What is the shorthand configuration for Ca2+
1s2 2s 2p6 3s2 3p6
Explanation:
calcium has lost 2 electrons.
HI I AM KEANU REEVES
Answer:
hey
Explanation:
Answer:
hi
Explanation:
UwU
What are the two main factoErosion by wind and water can move pieces of soil and rock.
As these materials settle on top of each other, they are pressed together, forming _______.rs in the mantle that contribute to the rock cycle
Answer:
purppurppurppurppurppurp
!!! EMERGENCY PLEASE ANSWER WITHIN THE FIRST MINUTE YOU SEE THIS !!!
Give the proper name for this compound formula, O2^2-:
A.) Oxide
B.) Oxygen
C.) Oxate
D.) Peroxide
Answer:
Its tetraoxygen
Explanation:
How many kilojoules of heat energy are absorbed when 98.5 g of water are heated from 24.5 oC to 48.8 oC?
Answer:
10.01461 kilojoules of thermal energy are absorbed when 98.5 g of water is heated from 24.5 ° C to 48.8 ° C
Explanation:
Sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change) causing a change in temperature.
The equation that allows to calculate heat exchanges in this case is:
Q = c * m * ΔT
where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the change in temperature.
In this case:
c=4.184 [tex]\frac{J}{g*C}[/tex]m= 98.5 gΔT= Tfinal - Tinitial= 48.8°C - 24.5°C= 24.3 °CReplacing:
Q= 4.184 [tex]\frac{J}{g*C}[/tex] *98.5 g* 24.3 °C
Solving:
Q=10,014.61 J
Since 1 J is equal to 0.001 kJ, then you can apply the following rule of three: if 1 J is equal to 0.001 kJ, then 10,014.61 J is equal to how many kJ?
[tex]kJ=\frac{10,014.71 J*0.001 kJ}{1 J}[/tex]
kJ=10.01461 kJ
10.01461 kilojoules of thermal energy are absorbed when 98.5 g of water is heated from 24.5 ° C to 48.8 ° C
PLS 10 points!!!
Rupert's backyard is 10 m by 5 m. The area of the yard is:
50 m
50 m2
15 m
15 m2
What is the percent change when an iodine atom (I) becomes an ion (I-)?
How many mL of methanol would
you add to water to make 250.0 mL
of a 14.5% methanol solution (v/v%)?
Answer: 36.25
Explanation:
Answer:
36.25
Explanation:
On a hot day, Ava got herself a carbonated beverage. She knew from her science class that carbonated drinks had carbon dioxide in them.
She noticed that bubbles started to form and rise upwards only after she unscrewed the cap. She then opened another bottle that was much colder and she noticed fewer bubbles had formed. Explain what Ava observed. PLS ANSWER, I NEED HELP !!
Explanation:
Using a derivative of the combined gas law we can explain what is happening in both instances.
Assuming that the volume is constant which is predicated on the bottle shape and structure, the pressure of a given mass of gas varies directly with the absolute temperature.
As temperature increases, the pressure also increases and vice versa.
The first bottle at a higher temperature has a higher pressure of gas. The second bottle at a lesser temperature has a reduced pressure inside.Mass is a(n)
property.
O a. electrical
Oc. chemical
Ob. physical
O d. natural
Answer:
d. natural I think is the right answer
Explanation:
I think thats the right answer
can you identify an atom without knowing numbers of neutrons in it?
Answer:
No
Explanation:
We cannot identify an atom without knowing numbers of protons in the atom.
The number of neutrons is the amount of neutrally charged particles in an atom. These subatomic particles occupy the dense nucleus with the protons.
To determine an atom, we use their atomic numbers. Atomic number is the number of protons in an atom. Protons are the positively charged particles in the atom. The periodic table of elements is arranged by the atomic number of an element.Which electron configuration represents the electrons of an atom of neon in an excited state
Answer:
Explanation:
The answer is 2-7-1, because the second shell isnt full and it already has a third shell.
How many hydrogen atoms are found in 3H2CO3?
Answer:
6
Explanation:
The number of hydrogen atoms in the given compound is 6 atoms.
Given compound is:
3H₂CO₃
An atom is the smallest indivisible particles of an element.
In the compound;
3H₂CO₃
Elements Number of atoms
H 3(2) = 6
C 3(1) = 3
O 3(3) = 9
The number of hydrogen atoms in the compound is 6
What is the Delta.Hf for this reaction? 16CO2(g) + 18H2O(g) Right arrow. 2C8H18(l) + 25O2(g)
Answer: The Hrxn for the reaction C(s) + O2(g) -> CO2(g) is the same as the Hf for CO2(g).
The Hf for Br2(l) is 0 kJ/mol by definition
The Hrxn for the reaction 1.5H2(g) + 0.5N2(g) -> NH3(g) is the same as the Hf for NH3(g).
Explanation:
Answer:
10,148
Explanation:
The elements from this section of the periodic table all belong to the same
A. Family
B. Group
C. Period
D. Valence
Plz help!!
Answer:
C. Period
Explanation:
The elements from this section of the periodic table belongs to the same period.
A period on the periodic table is a horizontal arrangement of elements according to their atomic number.
A group or family is the vertical organization of elements. Valence is the number of outer shell electrons an atom possess.how many sigma bonds and pi bonds are in limonene
Answer:
6 sigma and 1 pi
Explanation:
28
Aisha was preparing two cupcakes with the same
mass and volume in the same oven. In order to
determine the specific heat of the cupcakes, Aisha
measured the temperature of each one at four
different times. The graph below shows the changes
in temperature with time.
Answer:
Explanation:
I am sorry but the graph is not given
Identify the atomic number and atomic mass: Hydrogen: 1 proton, 0 neutrons, 1 electron
Answer:
Atomic Number: 1
Atomic Mass: 1
Explanation:
Atomic number = # of protons
Atomic mass = # of protons + # of neutrons
SEP Engaging in Argument Use the phase diagrams for CO2 and H2O in the Experience Notebook. Theaters sometimes use dry ice (solid CO2) to produce dense clouds of smoke like fog on stage. A classmate claims that the phase diagrams of H2O and CO2 show that it would not be practical to use H2O for this purpose. Do you agree with the classmate’s claim? Cite reasons to support your argument.
Answer:
Agree (see explanation)
Explanation:
I do agree with this statement of practicality. According to my research and viewership of phrase diagrams for both substances, water enters a similar form of “smoke” or “steam” at incredibly hot temperatures usually secluding to temperatures of over 200 degrees Fahrenheit (100 degrees Celsius) versus carbon dioxide of which enters this state at room temperature (60-70 degrees Fahrenheit). In order for either of these events to occur in this form, both must undergo procedures of sublimation where solids transfer directly from solids to gases, skipping the liquid state. Water contains ionic hydrogen bonds of which are incredibly strong particle arrangements, therefore requiring much higher temperatures to divide and individualize these particles forming high pressure and kinetic energy. Since carbon dioxide is formed of covalent bond ship, the intermolecular forces are relatively weak making the process of sublimation quite instant when this substance experiences exposure to specific temperatures, typically temperatures that we consider “normal”.
Hopefully I helped anyone understand this, and I apologize for being late to this question.....very late.
Four cats are sitting in a living room. Which cat has the greatest gravitational potential energy? (Lesson 3.10 Gravitational Potential Energy)
Question 1 options:
A 15 lb cat sitting 1 foot off the ground on a box
A 15 lb cat sitting 3 feet off the ground in a window
A 10 lb cat sitting 1 foot off the ground on a box
A 10 lb cat sitting 3 feet off the floor in a window
Answer:
I believe it is the first option.
Answer:
I believe it is "A 15 lb. cat sitting 3 feet of the ground in the window"
Explanation:
I think it is this one because it is one off the heaviest cats and it is this one because this 15 pound cat is higher than the other one. I hope you get an A
What is different about the rotation of Uranus?
the axis is vertical
there is no axis of rotation
the axis is pointing toward the sun
Answer:
Unlike the other planets of the solar system, Uranus is tilted so far that it essentially orbits the sun on its side, with the axis of its spin nearly pointing at the star. This unusual orientation might be due to a collision with a planet-size body, or several small bodies, soon after it was formed.
Explanation:
the axis is vertical
Answer:
The axis is pointing towards the sun!!!
Explanation:
What is the problem with a series circuit? *
A. They do not work
B. 1 goes out, they all go out
C. They are hard to create.
Answer:
I believe it is B
Explanation:
1. You are pushing a heavy shopping cart full of water bottles with a constant force. The shopping cart has
mass of 250 kg and it is accelerating down the aisle at 0.20 m/s? How much force are you exerting?
Answer:
F = 50 N
Explanation:
Given data:
Mass of car = 250 Kg
Acceleration of car = 0.20 m/s²
Force required = ?
Solution:
Formula:
F = m×a
F = applied force
m = mass
a = acceleration
Now we will put the values in formula.
F = 250 Kg × 0.20 m/s²
F = 50 Kg.m/s²
Kg.m/s² = N
F = 50 N
Which of the following is NOT a product of photosynthesis?
A. Glucose
B. Energy
C. Oxygen
D. Carbon dioxide
PLZ HELP
Select the correct answer from each drop-down menu.
Water pollution and air pollution in an area have been steadily increasing. What can students do to address these environmental hazards?
A. Pass Laws
B. Organize seminars
C. Create a tax collection
to educate other students about the deteriorating environmental conditions and the steps needed to
improve the area. Also, encourage other students to volunteer for workshops about
A. recycling and waste disposal
B. Poaching
C. Deforestation
Students can address water and air pollution by organizing seminars to raise awareness and educate others about the issues,
A. Organize seminars
B. recycling and waste disposal
Water pollution and air pollution are significant environmental hazards that require collective efforts to address. Students can play a crucial role in raising awareness and taking action to mitigate these issues. Here are the appropriate answers from the given options:
What can students do to address these environmental hazards?
A. Organize seminars
B. recycling and waste disposal
A. Organize seminars: Students can organize seminars or workshops to educate other students and the community about the deteriorating environmental conditions and the steps needed to improve the area. By sharing knowledge and information, students can raise awareness about the causes and impacts of water and air pollution, as well as the potential solutions to mitigate them. Seminars can provide a platform for experts, scientists, and environmentalists to share their expertise and inspire action.
B. Recycling and waste disposal: Encouraging other students to volunteer for workshops about recycling and waste disposal is an effective step toward addressing environmental hazards. By promoting proper waste management practices, such as recycling, composting, and reducing single-use plastics, students can contribute to minimizing pollution and conserving resources. These workshops can educate students on the importance of responsible waste disposal and provide practical tips and techniques to implement in their daily lives.
In summary, students can address water and air pollution by organizing seminars to raise awareness and educate others about the issues, as well as by promoting recycling and proper waste disposal practices. Through these actions, students can foster a culture of environmental stewardship and inspire positive change in their communities.
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