Why’d you put chemistry as the subject for a question about mood? What’s the excerpt? What’s the choices in the drop down list?
Answer:
mysterious
Explanation:
took test
Which of the following equations follows the Law of Conservation of Mass? 65
(5 Points)
3H2O --> 3H2 + 3 02
C2H4 + 3 02 --> 2 CO2 + 2 H2O
C + 4H2 --> CH4
2Na + Cl --> NaCl
ILL MARK YOU AS TOP COMMENT
Answer:
C₂H₄ + 3O₂ → 2CO₂ + 2H₂O
Explanation:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
3H₂O → 3H₂ + 3O₂
This equation do not follow the law of conservation of mass because there are more oxygen atoms on right side so mass is not conserved.
C₂H₄ + 3O₂ → 2CO₂ + 2H₂O
This equation follow the law of conservation of mass because there are equal number of atoms of all elements on both side of equation.
C + 4H₂ → CH₄
This equation do not follow the law of conservation of mass because there are more hydrogen atoms on left side of equation so mass is not conserved.
2Na + Cl → NaCl
This equation also do not follow the law of conservation of mass because there are more sodium atoms on left side of equation so mass is not conserved.
Choose the word that best completes the sentence.
Column A
1.
The positive subatomic particle is called the:
The positive subatomic particle is called the
2.
The negative subatomic particle is called the:
The negative subatomic particle is called the
3.
The neutral subatomic particle is called the:
The neutral subatomic particle is called the
Column B
a.neutron
b.electron
c.protist
d.proton
e.eukaryote
Answer:
1. proton
protist
2. electron
eukaryote
3. neutron
What is the reaction ship between cells and tissues
Answer:
A. Tissues are made up of cells
Explanation:
I just googled it :3
Which of these statements is supported by evidence in both articles? A The Triangle Fire was a tragedy that could have been prevented. B The absence of fire drills caused confusion among the trapped workers. C The Triangle Fire had a lasting impact on safety regulations. D Onlookers who witnessed the fire were horrified by what they saw.
Answer: A The Triangle Fire was a tragedy that could have been prevented.
Explanation:
The Triangle Fire was a tragedy that happened in the factory of Shirtwaist Company in New York City where there was.a.fore outbreak and about 145 employees of the company were killed.
The deaths could have been prevented because the company neglected safety measures such as having a good and reliable pump system, having readily available fire extinguishers. Also, what resulted in the lethal nature of the incident was because the doors within the building of the factory were locked.
The tragedy generated lots of attention and series of laws were been out in place in order to ensure that workers are safe at their workplace.
Please help! ______ is not reactive with only 2 electrons in its valence shell.
Neon
Krypton
Xenon
Helium
Answer:
Helium
Explanation:
idrk because it has a more carbinic bond
Part A
Decrease the volume of the chamber by dragging the left side inward. What values changed when you decreased the
volume of the container?
Decreasing the volume of the chamber by dragging the left side inward will increase the pressure of the container.
What is pressure?Pressure is the amount of force applied perpendicular to the surface of an object per unit area. The symbol for it is "p" or P.
If the volume of a container is decreased, the gas molecules have less space in which to move around. As a result, they will strike the walls of the container more often, and the pressure increases.
Learn more about the pressure here:
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Juan's mother drives 7.25 miles southwest to her favorite shopping mall. A. Average velocity is the total displacement divided by the total time taken. What is the average velocity of Juan's mother's automobile if it arrives at the mall in 20.0 minutes? B. Does the average velocity reflect the how fast Juan's mother was driving at every point in her journey? Explain your answer by comparing the terms average velocity and instantaneous velocity.
Answer:
See explanation
Explanation:
Average velocity = distance traveled/time
distance traveled = 7.25 miles
Time taken = 20 minutes or 0.33 hours
Average velocity = 7.25 miles/0.33 hours = 21.97 miles per hour
This average velocity does not reflect how fast Juan's mother drove at every point in the journey.
At every point in the journey, Juan's mother had an instantaneous velocity given by the velocity at that given instant divided by time taken up to that point.
The instantaneous velocity gives the velocity at particular instants throughout the journey while the average velocity reflects the average velocity of the entire journey.
How many atoms are in a sample of 0.585 moles of krypton (Kr)?
Answer:There are 1.51 × 1024 atoms
Explanation:
What is the net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons?
A
1+
В.
2+
C.
1-
D
2-
The net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons is +1. Thus option A is correct.
What is net charge?Net charge is defined as when the number of electrons in an atom does not equal the number of protons, the atom is said to be unstable.
If the number of electrons are less than the number of protons, then they will have positive net charge.
If the number of electrons are more than the number of protons, then they will form negative net charge.
Electrons are defined as negatively charged subatomic particle which together with protons and neutrons forms atom.
Thus, the net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons is +1. Thus option A is correct.
To learn more about net charge, refer to the link below:
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would coal be considered a mineral (yes or no) Why or why not
Answer:
It's classified as an organic sedimentary rock
Explanation:
What's the deal with coal? It's classified as an organic sedimentary rock, but rocks are combinations of minerals, and minerals are inorganic. ... So yes, coal is classified as an organic sedimentary rock, and yes, rocks are supposed to be made of minerals and minerals can't be organic.
Please help me answer this.
C connected to 2 H's by 1 line each and to O with 2 lines. The O has 1 pair of dots above and 1 pair of dots below.
How many electrons do carbon and oxygen share?
Answer:
4
Explanation:
I just got it right on one of the assignments in Edge2020.
Answer:
The answer is 4
Explanation:
What does a high specific heat tell about a substance?
A. It is hard to change the temperature of the substance.
B. The substance is probably a metal.
C. The substance has very strong molecular bonds.
D. The substance has high melting and boiling points.
Answer:
A. It is hard to change the temperature of the substance
Explanation:
took test
Assuming that water is made of tiny little water molecules, would you say that water molecules are attracted to one another, repelled by one another, or are kind of neutral about each other?
-attracted to one another
-repelled by one another
0kind of neutral about each other
Answer:
attracted to one another
Explanation:
water is cohesive
I dont undersand what its asking and what i should do
What is the difference between burning and an explosion?
a. Burning is a combustion reaction but an explosion is an accident.
b. The rate (speed) at which the reaction happens.
C. An explosion is a combustion reaction, but burning is just a chemical
reaction
Atomic numbers for atoms ______________ in increments of _________ as you move across the periodic table of elements.
- HELP FAST -
Which of the following arguments is supported by the demographics of families in the work force?
O The money spent on goods has increased, because family sizes are larger than they were one hundred years ago.
O The price for housing is still unstable, regardless of the number of people living in a household.
O The money spent on clothes is increasing and is becoming a serious problem for families.
O The price of farm equipment is decreasing, causing food to become less expensive over the past one hundred years.
Answer:
the answer is D the price for housing is still unstable, regardless of the number of people living in a household.
Explanation
Edge said it was the correct answer.
The argument that is supported by the demographics of families in the workforce is the price of farm equipment is decreasing, causing food to become less expensive over the past one hundred years. The correct option is D.
What is demography?Demography is the study of the statistic of the human population. It calculates the population of humans in a specific place. It includes the population base age, gender, and other factors.
The factors of demography are population size, density, age structure, fecundity (birth rates), mortality (death rates), and sex ratio.
Farm equipment is the equipment used in farming. If food becomes less expensive than energy, the body can buy food. Then the equipment used would decrease the price.
Thus, the correct option is D. The price of farm equipment is decreasing, causing food to become less expensive over the past one hundred years.
To learn more about demography, refer to the link:
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Earths system analysis graphic organizer
Answer:
attached
Explanation:
Excluding the noble gas group, how does the number of valence electrons in an element influence its chemical reactivity? O A. Elements with the lowest and highest numbers of valence electrons are the most reactive, B. As the number of valence electrons increases, the chemical stability of the elements decreases. C. Elements with the lowest and highest numbers of valence electrons are the least reactive. O D. As the number of valence electrons increases, the chemical stability of the elements also increases.
The relation can be described as:
A. Elements with the lowest and highest numbers of valence electrons are the most reactive.
Elements with lowest or highest valence electrons:Valence electrons can be described as the electrons in the outermost shell. The elements having the least valence electrons such as Helium which has stable electronic configuration or Chlorine which has the highest valence electrons that are 7. These can react easily with the elements having electrons according to reactivity.
Example: Chlroine reacts more easily with elements of group 1.
Thus, option A is correct.
Find more information about valence electrons here:
brainly.com/question/371590
Which type is a metamorphic rock formed from shale?
Answer:
Slate
Slate is a foliated metamorphic rock that is formed through the metamorphism of shale. It is a low-grade metamorphic rock that splits into thin pieces.Explanation:
What gas do animals give off in the dark?
Explanation:
Animals give off carbon dioxide and plants make oxygen by carbon dioxide.
Please answer these questions.. please
Suppose you have a mixture of sand, marbles, sawdust, and blocks of wood. You can separate these four things with a window screen, a bucket, and water. This will take three steps. The screen is used in the first step. The bucket and water is used in the second and third steps. Describe the three steps. Tell which properties of the materials made it possible to separate the mixture.
Answer:
Solubility and Particle size
Explanation:
The screen should be able to separate the blocks of wood and marbles from the sand and saw dust, assuming the marble are larger than the screen openings. This is possible through difference in particle sizes.The bucket can allow for removal of the marbles from the sand and sawdust if its smaller than the screen. Marbles are general larger than sand and would settle at the top.The water in the bucket would dissolve the saw dust instantly, leaving the sand. Sand is not soluble in water unlike he finer sawdust particles.I hope this was clear.
A swimmer travels 1500 m in 20 min. What is the averages
you choose the answer with the correct Units)
Answer:
75 m in 1 min
Explanation:
How many moles are in 2.5 * 10^20 iron atoms?
Answer:
The answer is 0.0004 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{2.5 \times {10}^{20} }{6.02 \times {10}^{23} } \\ = 0.000415282...[/tex]
We have the final answer as
0.0004 molesHope this helps you
An example of species?
Answer:
homosapiens is the species we all belong to or which humans belong to.
Explanation:
Can i have brainliest plzzzz
A sample of ancient bone is analyzed using carbon-14 dating. If the bone contains 50% as much C-14 as a modern bone, what is its approximate age?
A. 50 years old
B. 5,000 years old
C. 50,000 years old
D. 100,000 years old
Answer:
The correct option is;
B. 5,000 years old
Explanation:
The percentage amount of carbon-14 in the sample = 50%
The half life of carbon 14 = 5700
The half-life of a substance is the time it takes for a given sample of the substance to decay such that only half of the original quantity of the substance remains
The half-life of carbon 14 is around 5.730 years, which means it takes 5,730 years for a given quantity of carbon 14 to decompose and have 50% of the original quantity remaining
Therefore, given that only 50% of carbon 14 is remaining in the bone, the duration for the decomposition is approximately the half life of carbon 14, and the best option is that the age of the bone is approximately 5,000 years.
Role play anyone????
Answer:
no thanks
Explanation:
Answer:
I'd be down.
Explanation:
Magnesium has three isotopes: Magnesium-24, Magnesium-25 and Magnesium-26. The numbers 24, 25 and 26 refer to the ________________.
Answer:
I'm pretty sure the answer is Atomic Mass.
Hope I could help!
