Answer:
Farming/agriculture
Hope this helps and have a great day :)
And please mark me brainliest if you can :)
Sodium + oxygen
What colour is the flame produces
Answer:
Orange
Explanation:
I used google my b
Answer:
ORANGE
explanation:
Small pieces of sodium burn in air with often little more than an orange glow. Using larger amounts of sodium or burning it in oxygen gives a strong orange flame.
(b) Define, in terms of oxidation state, the Oxidizing agent
a substance which gains oxygen
a substance whis lose hydrogen
a substance which experiences a decrease in oxidation state
a substance which experiences an increase in oxidation state
Answer: a substance whis lose hydrogen
Explanation:
Record the length of the object shown.
Answer: 7.26 mm
I did the test already.
Which of the following is an irreversible physical change?
a) melting a piece of lead
b) sharpening a pencil
c) dissolving sugar into water
d) boiling water
Answer:
b) sharpening a pencil
Explanation:
If you melt lead, boil water, or dissolve sugar in water, you can return all of them back to their original state. If you sharpen a pencil, you can't reattach the shavings as they were originally.
You may put all of them back to their original states by melting lead, heating water to a boil, or dissolving sugar in water. You cannot rejoin the shavings from a sharpened pencil in their original position. Thus, option B is correct.
What is irreversible physical change?When something changes physically but not chemically, it has undergone an irreversible physical alteration that cannot be reversed.
Sharpening a pencil is a perfect example of an irreversible physical change. The wood turns to dust when you sharpen it. Just in a different shape, it is still wood. That wood dust cannot be transformed back into a pencil.
You cannot put a piece of paper back together the same way it was before you tore it if you tear it into tiny pieces.
An irreversible alteration is one that cannot be undone or that cannot be returned to its original state, such as when milk turns into curd, iron turns rusty, paper burns, food is cooked, etc.
Therefore, sharpening a pencil is an irreversible physical change
Learn more about irreversible here:
https://brainly.com/question/24111037
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The reaction in which methane is burned, CH4 +202 --> 2H20 + CO2, is an example of a
combustion reaction
O synthesis reaction
O decomposition reaction
O precipitate reaction
Answer: Combustion
Explanation:
Methane gas or natural gas is the hydrocarbon that reacts with oxygen as shown below: CH4 + 2O2 → CO2 + 2H2O There are two types of combustion reactions: complete and incomplete combustion. Therefore there are four products, carbon dioxide, water, carbon, and carbon monoxide.
Which describes the motion of the car as shown by the graph?
A) travels at a constant speed
B) not moving
C) changing directions
D) speeding up
PLSSS HELP WILL GIVE A LOOT OF POINTS
The diagram below shows two metal plates at different temperatures. Plate X is 30 degrees Celsius ( oC) and Plate Y is 50 degrees Celsius ( oC).
A.Plate X will become cooler and Plate Y will become cooler.
B.Plate X will become warmer and Plate Y will become cooler.
C.Plate X will become cooler and Plate Y will become warmer.
D.Plate X will become warmer and Plate Y will become warmer.
Answer:
I think B but I'm not sure.
Answer:
C.
Explanation:
What advances in technology helped usher in the scientific revolution? Choose the best answer.
1.The landing on the Moon by Apollo brought about the scientific revolution.
2.Discoveries by scholars in the Catholic Church revolutionized scientific knowledge.
3.The discoveries by ancient Greek, Muslim and Chinese scientists.
4.The discovery of optics gave scientists instruments such as microscopes and telescopes.
Answer:
The discovery of optics gave scientists instruments such as microscopes and telescopes.
Explanation:
The period between the 16th-8th century was called the period of the scientific revolution. At this time, the foundations of our modern science was laid.
One of the characteristic of this period was the emphasis on the scientific method which upheld results from reproducible experiments.
Nicolaus Copernicus, Francis Bacon and Isaac Newton were leading names in this period.
It was within this period that the discovery of optics gave scientists instruments such as microscopes and telescopes and scientific examination of the celestial bodies was launched.
The heart is a large
________________
that pumps the blood
throughout the body.
The millions of fossils that scientists have collected are called the fossil __.
Answer:
record
Explanation:
Show with dot and cross diagram of the formation of ions in the reaction of Fluorine with sodium ions.
Answer:
Please check the attached file
Explanation:
Sodium is present in group one. It has one valence electron. It is alkali metal. All alkali metal form salt when react with halogens.
Sodium need to lose one electron to get stable. All halogens have seven valence electrons they need only one electron to get stable electronic configuration.
When alkali metals such as sodium react with halogen fluorine it loses its one valence electron which is accepted by fluorine and ionic bond is formed. The compound formed is called sodium fluoride.
In cross and dot diagram electrons of one atom are shown as dots while other atom shown as cross to distinguish.
Please check attached file for electron dot diagram.
What is involved in weathering?
Answer:
the answer is water.Hope this helps
How many electrons does each lithium atom provide to the voltaic cell?
A. 1
B. 2
C. 3
D. 4
Answer:
c. 3 electrons
Explanation: for the element of LITHIUM, you already know that the atomic number tells you the number of electrons. That means there are 3 electrons in a lithium atom.
Define the concept of Energy in your own words
Answer:
In general, the word energy refers to a concept that can be paraphrased as "the potential for causing changes", and therefore one can say that energy is the cause of any change. The most common definition of energy is the work that a certain force (gravitational, electromagnetic, etc) can do. Due to a variety of forces, energy has many different forms (gravitational, electric, heat, etc.) that can be grouped into two major categories: kinetic energy and potential energy. According to this definition, energy has the same units as work; a force applied through a distance. The SI unit of energy, the joule, equals one newton applied through one meter, for example. Energy has no direction in space, and is therefore considered a scalar quantity. Energy is a conserved quantity, meaning that it cannot be created or destroyed, but only converted from one form into another. Thus, the total energy of the universe always remains constant. One form of energy can be readily transformed into another; for instance, a battery converts chemical energy into electrical energy.
Explanation:
NEED HELP PLEASE
Part A:
In your own words, describe the process of a physical change.
Part B:
What is the difference between a physical change and a chemical change? Give an example of each.
Answer:
Part A:
A physical change is a change of a substance from one form to another without changing its composition.
Part B:
A physical change is a change of a substance from one form to another without changing its composition. Example: A balloon deflating into its original form.
A chemical change occurs, one substance combines with another substance to make something completely new. Example: Making and baking a cake.
Select the correct answer.
In which situation is no work considered to be done by a force?
A.
when the angle between the force and displacement is 180°
B.
when the angle between the force and displacement is 90°
C.
when the angle between the force and displacement is 45°
D.
when the angle between the force and displacement is 0°
Answer:
Explanation:
when the angle between the force and displacement is 0
Burning is a type of_________reaction.
O replacement
O decomposition
O synthesis
O combustion
Answer:
Combustion
Explanation:
Happy Halloween!
Sugar is added to iced tea and the contents are stirred until all of the sugar dissolves. How would the tea now be classified?
Which is an example of a neutral mutation? 1. one that causes abnormal human skin cells to reproduce and divide rapidly, producing a movie 2. one that increases the size of a seed pod, allowing the seeds inside to be spread and eventually grow 3. one that results in smooth plant leaves, while not changing the function of the leaves 4. one that brightens the feathers of a bird, making it easier for other animals to see it.
Answer:
its C) one that results in smooth plant leaves, while not changing the function of the leaves
Explanation:
Answer:
Person above me is right!
Explanation: its C :)
HELPPP PLEASEEE!!! calculate the energy of radiation with a wavelength of 432 nm
Define a force.......
Answer:
Gravitational Force.
Gravitation is the agent that gives weight to objects with mass and causes them to fall on the ground when dropped.
Answer:
A force is the strength or energy as an attribute of physical action or movement.
Explanation:
In smaller words, a force is a form of energy caused from a push or a pull on an object. A force happens when two objects interact with each other. For example, when you throw a ball you are using force.
Hopefully this helps im sorry if i got it wrong im kinda dumb... XD
I'm not sure what to do here...
Answer:
Explanation:
As relative molecular mass of molecule increases its rate of diffusion decreases . Mr of HCl is 1+35.5=36.5 which is greater than Mr of NH3 which is only 14+3=17. As HCl is heavier it'll diffuse at a lower rate so travel less distance whilst NH3 will cross a greater distance as it diffuses faster so white solid appears closer to HCl that is approximately B.
at what temperature does a solid turn into a liquid
Answer:
0°C
Hope this helps Do mark as brainliestAnswer:
a little over 0 degrease cel
Explanation:
which element would have properties most like arsenic (As)? Te Ge P Se
Answer:
P
Explanation:
How many carbon atoms are there for every 2 oxygen atoms in CO2? A. 1 B. 2 C. 3 D. 4
Answer:
I think it's 1, but if that's wrong I'm really sorry
Classify the following chemical reaction
3 C + 4H2→ C3 H8
Answer:
Synthesis Reaction
General Formulas and Concepts:
Synthesis Reactions: A + B → AB
Decomposition Reactions: AB → A + B
Single-Replacement Reactions: A + BC → AB + C
Double-Replacement Reactions: AB + CD → AD + BC
Explanation:
Step 1: RxN
3C (s) + 4H₂ (g) → C₃H₈ (s)
We see here that we are combining 2 elements to form a compound.A would be C, B would be H₂, and C₃H₈ would be ABTherefore, we have a Synthesis ReactionWhat is the rule of zero charge?
Answer:
The nonmetal atoms accept electrons and form ions with a negative charge, called anions. When an ionic compound forms, the total charge on the atoms adds up to zero. This is known as the rule of zero charge.
Explanation:
Atomic number is equal to the number of electrons in an atom?.
Answer:
true I think not sure
Explanation:
Which of the following has a higher electronegativity oxygen or selenium?
Answer: Oxygen
Explanation: Oxygen has more ionisation energy and Oxygen has a small size which makes it more electronegative.
What is this phenomenon called?
A.
codominance
B.
coinheritance
C.
incomplete dominance
D.
single gene dominant/recessive trait