Based on the Law of Conservation of Matter, what number should be placed in the box to balance the chemical equation below?
Group of answer choices
No coefficient is needed.
2
4
3
Answers
Answer:
2
Explanation:
Step 1: RxN
4Al + 3O₂ → Al₂O₃
Step 2: Balance RxN
We have 4 Al's and 6 O₂'s on the reactant side.
We need the same number of Al's and O₂'s on the product side.
4Al + 3O₂ → 2Al₂O₃
Related Questions
Explain what wave frequency is...
Answers
Explanation:
Wave frequency is the number of waves that pass a fixed point in a given amount of time. The SI unit for wave frequency is the hertz (Hz), where 1 hertz equals 1 wave passing a fixed point in 1 second. A higher-frequency wave has more energy than a lower-frequency wave with the same amplitude.
Wave frequency is the number of waves that pass a fixed point in a given amount of time.
When methane is burned it interacts with oxygen to form carbon dioxide and water vapor. Which of the following is the word chemical equation for this reaction?
Group of answer choices
oxygen + carbon dioxide -> methane + water
methane + oxygen -> carbon dioxide + water.
methane + carbon dioxide -> water + oxygen.
dioxide + carbon -> methane oxygen + water.
Answers
Answer:methane + oxygen -> carbon dioxide + water.
Explanation: this is your answer was happy to help
The blue mass is currently 4 meters away from the red mass.
If we change each mass to 20kg, what will happen to the gravitational force each mass puts on the other?? YOU HAVE TO CHOOSE A ANSWER THROUGH A B C!
The force of gravity will increase as the masses increase.
The force of gravity will not change as the masses increase.
The force of gravity will decrease as the masses increase.
Answers
Answer:
its a!
Explanation:
•✧•
(May give brainliest) Answer This Please!
Answers
Answer:
I was gonna answer but its old
Explanation:
Interference is the ___________ of two or more waves.
Answers
Explanation:
\
its the 1 one
Answer:superimposition.
Explanation:it occurs when two or more waves pass through one another.
The blue mass in the image is 10kg.
The red mass in the image is 10kg.
The blue mass is currently 4 meters away from the red mass.
If we change the distance to 6 meters apart, what will happen to the gravitational force each mass puts on the other ?? You have to choose a answer through A,B,C !
Answer A The force of gravity will not change as the masses move away from each other.
Answer B The force of gravity will increase as the masses move away from each other
Answer C The force of gravity will decrease as the masses move away from each other
Answers
Answer: C
Explanation:
I guessed lol . Am i right .
I need with this. Answer as fast as you can
Answers
Answer:
Its the third answer!!!
Explanation:
Answer:
measure the time it takes for the dog to run a certain distance
Explanation:
Speed can be thought of as the rate at which an object covers distance. A fast-moving object has a high speed and covers a relatively large distance in a short amount of time.
PLS HELP ME I WILL GIVE YOU BRAINLIEST
1.What are Tectonic Plates?
2.Explain the Role of each of Earth's Layers involved with the movement of Tectonic Plates...
3.What is Pangaea?
4.What natural processes do Tectonic Plate movements cause?
5.Explain the "Ring of Fire"
PLS USE YOUR OWN WORDS
Answers
4. If the tectonic plates are disturbed, they can cause mass earthquakes and tsunamis.
5. The ring of fire is a massive collection of volcanoes under the pacific ocean. They all form the shape of a ring, hence the name.
SORRY, I COULDNT ANSWER THE FIRST TWO QUESTIONS.
What do we call the region surrounding a large body of mass in which a gravitational force is experienced?
Question 2 options:
Answer A Magnetic field.
Answer B Gravitational field.
Answer C Field strength.
Answer D Electric field.
What do we call the region surrounding a large body of mass in which a gravitational force is experienced?
Question 2 options:
Answer A Magnetic field
Answer B Gravitational field
Answer C Field strength
Answer D Electric field.
Answers
Answer:
think it B Gravitational Field
Explanation:
Hope that worked!!!
The mass of the man is 86 kg. What is the force of friction that slowed him down? Use the equation for Newton’s second law, F = ma.
Answers
Answer:
Mass = 86 kg acceleration due to gravity = 10m/sExplanation:
So force =m*a
Mass = 86 kg acceleration due to gravity = 10m/s
If a steel nail is wrapped 8 times with an insulated copper wire and each end of is attached to a 1.5 V battery, we find that it will lift the weight of 2 large paper clips. We hypothesized that for each 8 coils, you will be able to pick up one additional paper clip. When we ran the experiment, we observed and recorded that when we added 8 more wraps around the nail (16 coils) we could lift 4 paper clips and when we added 8 more wraps (24 coils) we could lift 6 paper clips. Choose the correct conclusion to the experiment.
1. We redesign the test and hope for better results.
2. We concluded that every time we add 8 wraps to the nail the total number of paper clips lifted doubled.
3. We concluded that our original test flawed. Because of the results, 8 coils should be able to pick up 2 paper clips. We will check our original test with a fresh battery.
4. We concluded that something went wrong with the experiment since it didn't give us the results we expected.
Answers
Answer:
2
Explanation:
i think that it would be 2 because it makes the most sense
2.) we concluded that everytime we add 8 wraps to the nail the total number of paper clips lifted doubled.
Someone help
Its a Friday night and i have no idea what this answer for my hmw is
Average speed is described as _____.
A) speed that does not change
B) speed that does not always move at the same rate
C) speed that decreases
D) none of these
Answers
Since that is not an option, I am assuming the answer is D
h e l p m e p l e a s e
Answers
Answer:
I cant read anything post a better pic broo
2 is physical property
then idk the rest im lazy lol
Explain when do we have an acceleration.
Answers
Cumulonimbus clouds are associated with what type of weather?
1.Stormy
2. Fair
3. Windy
Answers
Cumulonimbus clouds are associated with stormy weather.
If an astronaut is 66 kg, what is their weight in N on the moon?
Answers
The mass of the person would be 66 kg on both Earth and the Moon.
66
k
g
. His weight, however, is calculated using the formula:
=
w
=
m
g
So, weight, equal mass times the acceleration due to gravity. On the moon, acceleration due to gravity is 1.62/²
1.62
m
/
s
²
. If we plug these “givens” in, we get:
=(66)(1.62/²)
w
=
(
66
k
g
)
(
1.62
m
/
s
²
)
Therefore, weight equals 106.92
106.92
N
e
w
t
o
n
s
(the unit of weight)
How does the temperature of water change when it is placed in a freezer and
then begins to freeze?
O A. It decreases first and then remains constant.
B. It decreases first and then increases.
O C. It increases first and then remains constant.
D. It increases first and then decreases.
Answers
The temperature of water changes as It decreases first and then remains constant . when it is placed in a freezer and then begins to freeze, therefore the correct answer is option A .
What is thermal energy ?It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy .
When water changes to ice, firstly the temperature of the water decreases due to the specific heat, and during the phase change process, the temperature of the water remains constant .
Water temperature fluctuates when it initially drops and then stays the same . The right response consequently options A when something is placed in a freezer and starts to freeze .
To learn more about thermal energy here , refer to the link given below ;
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You sit with friends around a campfire, roasting marshmallows. Which
transfer of thermal energy involved in this system is an example of
conduction?
O A. Thermal energy moves through the air from the flames to the
marshmallow.
B. Thermal energy moves within the air above the flames as warmer
air rises.
C. Thermal energy moves from the marshmallow to your fingers as
you touch the marshmallow.
D. Thermal energy moves through the air and warms your hands and
face.
Answers
The transfer of thermal energy involved in this system which is an example of conduction is "thermal energy moves from the marshmallow to your fingers as you touch the marshmallow."
Conduction is the movement of thermal energy without the actual movement of the particles of a body. They particles only collide with each other and transfer energy in the process while maintaining their mean positions.
When you touch the marshmallow, you feel the heat by conduction. Hence, the transfer of thermal energy involved in this system which is an example of conduction is "thermal energy moves from the marshmallow to your fingers as you touch the marshmallow."
Learn more: https://brainly.com/question/7643131
Answer: the answer is B
Explanation: answer is : Thermal energy moves within the air above the flames as warmer air rises
Please help urgent!!! 20 points and if you answer both i will give brainliest
9. Waves with the shortest wavelengths have the highest
______________________.
10. The higher the frequency of a wave, the higher the
________________________.
Answers
Answer: 9.Gamma rays 10. Hertz
Explanation:
With energy, changes in the physical world are possible. These can be a change in speed, a change in direction, a change from cold to hot, and many other kinds of changes.
Question 4 options:
True
False
Answers
According to the Law of Conservation of Energy, the energy in a closed system is constant
The correct option for changes in the physical world are possible with energy, is the option;
True
Reason:
According to the Law of Conservation of Energy, energy cannot be created nor destroyed, but can be changed from one form to another
Therefore;
The changes in speed which is the change in kinetic energy is possible
Change in direction which is a change in velocity vector is change in kinetic energy is possible
Change from cold to hot by the addition of heat energy and other forms of energy
Therefore, the correct option is; True changes in the physical world are possible
Learn more about the Law of Conservation of Energy here:
https://brainly.com/question/12053135
HELP ME
which examines some industrial applications of magnets and electromagnets, list two examples of objects that you use every day that rely on magnets or electromagnets.
Answers
Answer:
Headphones use electromagnets, and Audio Speakers use very large magnets inside of them
Explanation:
This answer doesn't really need an explanation but you can just research why they use those kind of magnets in those objects if you want.
Calculate the speed of the object from 5 seconds to 10 seconds. Show your work and don't forget to include the units. (HINT for distance, make sure you are telling me the total distance traveled from 5 seconds to 10 seconds... no it is not 5 meters)
Answers
Answer:
Given
mᴀ = mʙ = mᴄ = 62 kg
Fᴀ = 480N
Fʙ = 240 N
Fᴄ = 600 N
Asked
aᴀ, aʙ, aᴄ = ?
Solution
Based on the question, we know that the mass of road A, road B and road C are same. And, the formula of acceleration is
so, we can calculate the acceleration of road A, road B and road C.
• for road A
aᴀ = 7,7419 m/s²
aᴀ = 7,75 m/s²
• for road B
aʙ = 3,8709 m/s²
aʙ = 3,87 m/s²
• for road C
aᴄ = 9,6774 m/s²
aᴄ = 9,68 m/s²
Explanation:
What is your hypothesis (or hypotheses) for this experiment?
This lab is for KE (Kinetic Energy).
Answers
Answer:
mr or ms please type ur question fully please
Debby and Ben took different routes to travel from Point A to Point E. Debby took the route along A, B, C, D, and E. Ben took the route along A, G, F, and E. Debby and Ben both took 4 hours to complete their walk. Their routes are shown. (3 points)
Which statement is true about Debby and Ben's average speed?
Ben and Debby's average speed was the same.
Debby's average speed was twice Ben's average speed.
Ben's average speed was twice Debby's average speed.
Debby's average speed was three times Ben's average speed.
Answers
Answer:
Ben's average speed was twice Debby's average speed.
Explanation:
Ben covered a total distance of 16 miles (10+4+2) and Debby covered 8 miles (3+2+2+1) which is half of what Ben covered. As they both reached the place in the same amount of time it tells us Ben was faster.
Although two identical objects may have the same mass and the same weight (meaning that the force of gravity is the same for both), they may not fall to Earth at the same rate. This is because of air resistance. Any object that is falling has friction, or resistance, from the air. The larger the object, the more resistance it has as it falls.
Get two identical pieces of paper. Crumple one up into a ball, but leave the other one a flat sheet. Drop both pieces of paper off a high place at the same time. What happens? Which falls faster? Record your observations and make a conclusion, using the terms “mass,” “weight,” “force,” “resistance,” and “gravity.”
MUST BE AT LEAST 4 sentences and include the terms weight, force, resistance, and gravity.
Answers
Answer:
the paper ball falls faster and the unfolded paper falls at a slower rate
Explanation:
this is because gravity is pulling both objects down to the ground and hence they are falling. Both objects have the same mass and weight but the resultant force of the paper ball is smaller than that of the unfolded paper. The unfolded paper has a larger surface area and so a larger force is acted upon it, meaning there is more air resistance. This shows that the paper ball falls faster than the unfolded paper.
The air resistance acting on the crumpled ball will be less and hence it will fall faster.
What is Air resistance?
Air resistance describes the forces that are in opposition to the relative motion of an object as it passes through the air. The larger the object, the more resistance it has as it falls.
Mathematically, we can write it as -
F = [tex]\frac{1}{2} C_{D}[/tex] × ρv²A
Given are two identical pieces of paper such that one is crumpled up into a ball and the other one is left as flat sheet.
Now, as you throw both, the crumpled up ball and the flat sheet, the crumpled up ball will fall faster. The main reason behind this is that the total surface area of the crumpled ball in contact with the air is less than compared to that of the flat sheet. Air resistance on the crumpled ball with surface are in contact [say A(c)] can be written as -
F[1] = [tex]\frac{1}{2} C_{D}[/tex] × ρv²A(c)
And that on the flat sheet with area of contact with the air [say A(f)] can be written as -
F[2] = [tex]\frac{1}{2} C_{D}[/tex] × ρv²A(f)
Now as A(f) > A(c), therefore F[2] > F[1]
Therefore, the air resistance acting on the crumpled ball will be less and hence it will fall faster.
To solve more questions on Air resistance, visit the link below-
https://brainly.com/question/19165683
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Please answer ASAP!!!
Write a paragraph of five sentences or more explaining how the radio uses the behavior and characteristics of the radio wave to function.
Answers
Answer:
Radio waves have the longest wavelengths in the electromagnetic spectrum.You can tune a radio to a specific wavelength—or frequency—and listen to your favorite music. The radio "receives" these electromagnetic radio waves and converts them to mechanical vibrations in the speaker to create the sound waves you can hear.
Explanation: