Answer Choice: C
Explanation: Mendeleev is best known for publishing the first periodic table of elements in 1869, revolutionizing the world's understanding of physics and chemistry; and, really almost every aspect of science.
Which choice is an element? carbon dioxide water carbon air
Answer:
carbon
Explanation:
Considering the definition of elements ans compounds, carbon is an element.
Elements are simple substances that cannot be broken down by common chemical methods. The atoms in an element are the same as each other, yet they are different from those in other elements. In addition, the elements are represented by a symbol and can be found in the periodic table.
On the other hand, compounds are substances that are the result of the chemical union of two or more elements. This combination makes it impossible to identify each element by its individual and original properties. Compounds can be separated by chemical action.
In summary, the element is a pure chemical substance formed from an atom, which is characterized in that it cannot be divided or transformed by a chemical reaction. Whereas a compound is a pure chemical substance made up of a particular set of molecules or ions that are chemically bound together.
So, being:
carbon dioxide: composed of carbon and oxygen water: composed of two atoms of hydrogen and one of oxygenair: composed mainly of oxygen and nitrogenthen, carbon is an element.
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Which of the following is a physical change?
Dissolving salt in water
Digesting food
Burning wood
Oxidation
How do you separate rice grains that have accidentally mixed with flour
how many neutrons does the isotope of hydrogen called deuterium have
Answer:
The deuterium has one neutron and one proton (mass number equals 2) whereas, the far more common hydrogen isotope, protium, has no neutons in the middle.
Explanation
What MUST always be true of the masses of the red and blue liquids?
А.
They will NEVER equal the mass of the purple liquid to the right of the arrow.
B.
They will ALWAYS equal the mass of the purple liquid to the right of the arrow.
I will brainless who can answer this all pleaseeeeej
Answer:
1. False
2. True
3. False
4. False
5. False
6. True
7. True
8. not sure
9. True
10. False
Explanation:
What are essential and non-essential water uses?
Helium is classified as a(n)?
O alkaline earth metal
O alkali metal
O transition metal
O noble gas
Answer:
NOBLE GAS
Explanation:
Look At The Table Of Elements
Can someone find from which website this test is?
Answer:
Try quizlet, they have everything on there
Explanation:
Is carbon mixed with sand a homogeneous or heterogeneous mixture
Answer:
homogeneous
Explanation:
because I said so
A carbon mixed with sand is a heterogenous mixture.
What is heterogenous mixture?
Mixture is defined as a combination to two or more simpler substances.
There are two types of mixture
Homogenous mixture - A homogenous mixture is defined as a mixture of two or more component which is uniform throughout the mixture. They include water, air, steel etc.Heterogenous mixture - A heterogenous mixture is defined as a mixture of two or more phase which is not uniform throughout the mixture. They include sand and water, salt and oil etc. They are a non uniform mixture with visible or invisible particles.Thus, carbon mixed with sand is a heterogenous mixture.
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Why are alloys generally used to make everyday objects?
Answer:
Alloys are often stronger and less active than pure metals. Alloys have higher melting point than pure metals.
Emma strikes a match and sets some logs on fire. As the fire burns, which two forms of energy are released?
Answer:
Explanation:
There are changes in the chemical composition of the word.
There's light energy given off.
There's heat energy given up.
does the tempurture of the vinegar affect the volcano flow
what is the second most abundant gas in the atmosphere
Pls helppppppppppppppppppppppppp
Answer:
The sun reflects off different parts of the moon as it orbits the earth
Explanation:
Answer:
the sun reflects off different parts of the moon as it orbits the Earth.
Jax designs an expierment to determine how the amount of sodium chloride affects the boiling point of water which is the independent /manipulated variable
Answer:
The amount of sodium chloride.
Explanation:
This is because an independent/manipulated control is something that is changed or controlled by the experimenter. Jax has control over the change of sodium, therefore the answer is the amount of sodium chloride.
I took the test and got this answer right btw. Good luck everyone :)
How do I know if a reaction is spontainous or not?
Answer:
i dont care to you
Explanation:
cause you are tuyo
the answer is this
What is a unique quality of the halogens/halides?
Answer:
Halogens are highly reactive
In an experiment to determine how to make sulfer trioxide, a chemist combines 32.0g of sulfer with 50.0g of oxygen. She finds that she made 80.0g of sulfer trioxide and had 2.0 g of leftover oxygen. How would the chemist make 100.0 g of sulfer trioxide so that she has no leftovers?
Explanation:
i Forgot the answer sorry but ihave that modulesubscripts in chemical formulas are used to indicate the relative proportions of the elements in a
Answer:
relative proportions of the elements in a chemical reaction
A molecule or a compound can easily be represented by their formula.Subscripts in chemical formulas are used to indicate the relative proportions of the elements in a compound.
What is chemical formula?A chemical formula represent the identity and number of elements in a molecule or compound. Each element in periodic table has their own symbols. For example, hydrogen is H, oxygen having O, N for nitrogen, Na for sodium etc.
These chemical symbols are came from the first one or two letters of the Latin names of the elements. The number of these elements in a compound is given as subscripts of their symbols.
For example, there are two hydrogens and one oxygen in water and the formula is H₂O. Similarly the formula of carbon dioxide is CO₂ where one carbon and two oxygens are present. In this way the compounds can be easily identified and distuinguished using their chemical formulas.
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What is an electrolytic cell?
A. A cell with a negative cell voltage
OB. A cell with a spontaneous redox reaction
C. A cell with a positive cell voltage
D. A cell that has a salt-bridge connection
Answer:
A. A cell with a negative cell voltage
Explanation:
other answer is wrong
An electrolytic cell is a cell with a spontaneous redox reaction (option B).
What is an electrolytic cell?Electrolytic cell is an electrochemical cell that utilizes an external source of electrical energy to force a chemical reaction that would otherwise not occur.
An electrolytic cell converts electrical energy into chemical energy. The redox reaction in the cell occurs spontaneously and is responsible for the production of electrical energy.
Therefore, according to this question, option B is correct.
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Which of the following represents the velocity of a light wave?
O A. E = fx2
O B. c = hxf
O C. E = hxf
O D. c = fx2
Answer:
D. c = fλExplanation:
c = fλ
where" c "is the speed of light ,
• "f" is the frequency of the electromagnetic waves,
• " λ" is its wavelength.
The term that represents the velocity of a light wave is c = fx2. The correct option is D.
What is velocity?Velocity is the speed by which an object moves or do any motion. When an item is moving, its velocity is the rate at which its direction is changing as seen from a certain point of view and as measured by a specific unit of time.
Light waves are the movement of waves in a direction. There are two types of transverse and electromagnetic. They are divided on the way of their movement.
The velocity of the light wave is the speed at which the light wave moves in a specific direction in time. The formula is given below:
c = fλ
Where c is the speed of light.
f is the frequency of the electromagnetic waves,
λ is its wavelength.
Thus, the correct option is D. c = fx2.
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What is the formula for Iron (3) Oxide?
Answer:
IT should be Fe2O3
Explanation:
Fe2O3
Answer:
Iron (III) Oxide = Fe2O3
Use your knowledge of valence electrons and how they affect bonds to figure out how carbon (Group 14) and oxygen (Group 16)
would be attached to one another. In carbon dioxide (CO2), how is the compound structured? (Use "-" to represent a single
bond and "=" to represent a double bond) (1 point)
C-O-O
O=C-O
C=O-O
O=C=O
Answer: D
Explanation:
O=C=O
Carbon is in group 14 having four valence electrons and oxygen is in group 16 having six valence electrons hence the correct structure of CO2 is O=C=O.
Carbon and oxygen are nonmetals. Nonmetals form compounds by sharing electrons in a covalent bond.Carbon, a group 14 element has four valence electrons while oxygen, a group 16 element has six valence electrons.
Carbon can share four valence electrons with two oxygen atoms in CO2 to form the structure O=C=O. In this way, all the atoms now obey the octet rule.
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Someone pls help me with this I will make you brain
Answer:
The answer should be primary pollutants from a stationary source.
Explanation:
Primary pollutants are emitted directly from a source and do not change in the atmosphere, and from a stationary source because manufacturing factories have a fixed location.
Hope this helped :D
Convert SI units .68mm. =km
Convert 68 Millimeters to Kilometers (mm to km) with our conversion calculator and conversion tables. To convert 68 mm to km use direct conversion formula below.
68 mm = 6.8E-5 km.
You also can convert 68 Millimeters to other Length (popular) units.
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if one mole of na3po4·3h2o is heated extensively, how many moles of water are released?
When one mole of Na3PO4.3H2O is heated extensively, three moles of water are released.
The water molecules in Na3PO4.3H2O are called molecules of water of crystallization. These molecules are not covalently bonded to the Na3PO4 molecule. They are only loosely attached to the substance.
Strong heating will drive away these molecules of water of crystallization to give three moles of water in the product.
Hence, when one mole of Na3PO4.3H2O is heated extensively, three moles of water are released.
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Can someone please help me write a little 2 sentence answer to this for me, it would be so helpful and the first person to answer it will most definitely be marked brainlist.
Answer:
I think that it would be better to have smaller cells because smaller cells takes less energy to transport waste and generally more efficient to control than larger cells. It is better to have smaller cells because larger and fewer cells takes up more nutrients, but doesn't cover as many surface area. In the end, smaller cells are more efficient, cover more surface area, and moves faster than bigger cells.
Explanation:
I hope that this is the kind of answer you were looking for!
Tổng số hạt mang điện trong ion AB4 3- là 50. Số hạt mang điện trong nguyên tử A nhiều hơn số hạt mang điện trong hạt nhân nguyên tử B là 22.Cấu hình e lớp ngoài cùng của A là gì?