Answer:
c
Explanation:
beacause Câu 1: Trình bày phương pháp hóa học nhận biết
24) When salt and water are mixed, they form a solution like in the ocean. When sand and
water are mixed, they form a mixture where the sand does not dissolve. Which statement
might summarize this observation?
A) Mixtures and solutions are the same.
B) All substances mixed with water are solutions.
In mixtures, you cannot see the separate substances.
D) In solutions, you cannot see the separate substances.
I think the answer is d if I'm wrong I'm So so so sorry
why does magnesium in an aqueous solution of magnesium chloride conduct electricity but solid magnesium chloride does not?
Answer:
Delocalized electrons
Explanation:
Magnesium Chloride is an ionic compound, so its lattice structure prevents the flow of electrons. However, when you convert the ionic compound into an aqueous solution it allows movement of electrons/ions due to the breakdown of the molecular forces which make it conductible. In short, Ionic compounds as a solid are not conductible but they are in an aqueous form.
Why Leaves Change Color in the Fall
Answer:
Chlorophyll Breaks Down
Explanation:
But in the fall, because of changes in the length of daylight and changes in temperature, the leaves stop their food-making process. The chlorophyll breaks down, the green color disappears, and the yellow to orange colors become visible and give the leaves part of their fall splendor.
Answer GREEN CHLOPHYL GOES AWAY
Explanation:
THE RDS, YELLOW, BROWNS, AND PURPLES OF FALL LEAVES ARE TIN THE LEAVES ALL SPRING AND SUMMER. IN THE FALL, THE GREEN CHLOROPHYL WHCIH HAS COVERED THE OTHER COLORS, GOES AWAY AND WE SEE THE OTHER COLORS THAT WERE ALWAYS PRESENT
A new element has been discovered. Scientists are trying to determine where it should it be placed on the periodic table. In order to do this they must determine the following about the element:
Elements are placed in order on the periodic table based on their atomic number, how many protons they have. In a neutral atom, the number of electrons will equal the number of protons, so we can easily determine electron number from atomic number.
Some copper is palced in a previouly weighted crucible and reweighed .
Mass of crucible + copper = 5.92g
Mass of crucible = 4.65g
Clculate the mass of copper used in the experiment
We can find the mass of copper by finding the difference between the mass of the crucible and the copper, and just the crucible. This is possible since the mass that is left would be attributed to just the copper.
Mass of copper = (Mass of crucible + copper) - Mass of crucible
= 5.92 g - 4.65 g
= 1.27 g
One of the few resources on Mars is
Answer:
iron .. titanium.. nickel....aluminum... sulfur... and calcium
discrib acidic oxide that can be Thermal Decomposetio of carbonat
concepts of oxidation numbers and how to learn them
Answer:
yes is it yes yes yes yes yes yes yes yes yes yes
The electron configuration for Helium (He) is shown below.
1s2
Which diagram shows the correct distribution of electrons in the electron shells of a helium atom?
Answer:
3rd image
Explanation:
An unknown element X forms a compound with chlorine: XCL2. Predict the chemical formula of the compound that element X makes with oxygen. Justify your answer.
When asked why a chlorine atom gains one electron to form an anion with a 1- charge, a classmate answered, "Because noble gas configurations are stable." Is this statement generally true?
Noble gases have the maximum number of electrons in their outer shell. The statement made by the student about the stability of noble gases is generally true.
It is true that noble gases are stable elements. This can be attributed to the fact that they have the complete number of elements in their outer shell. That is why they hardly participate in any reactions. The chlorine atom receives an electron from a donor element and attains a negative charge. When two chlorine atoms bond covalently, they share electrons and thus attain the noble state configuration.Learn more here:
https://brainly.com/question/18349740
I need help with this question please
1-propanol is the correct answer.
Rita measures the temperature of a pot of hot water and finds that it is 85.6
°C. What is this temperature in °F?
A. О 96.5 °F
B. O 212 °F
C. O 79.6 °F
D. O 186 °F
What gas in our atmosphere is thought to have come from plants and algae alone?
Answer:
Oxegen
Explanation:
All that oxygen has to come from somewhere. You might already know that it comes from photosynthetic organisms like plants.
Which of the following is similar in size to an atom?
O A ball used in sports, such as a basketball
O A large building, similar to a shopping mall
O A particle you cannot see with your eyes
O A seed of a fruit from an apple or orange
Do all particles pass right through the atoms undeflected?
AnswereYs
Explanatioynt:Yes
An atom that gains one extra electron forms an ___________with a 1- charge.
Explanation: When an atom gains/loses an electron, the atom becomes charged, and is called an ion. Gaining an electron results in a negative charge, so the atom is an anion.
draw a segment of polybutadiene containing three monomer units. connect each end of the segment with a bond to one of the r groups. the r groups represent the connecting carbon atoms in the monomers adjacent to the segment. be sure to draw all hydrogen atoms.
This problem states polybutadiene as a polymer from which we have to draw three monomeric units, showing the rest of it with a general notation (R).
In this case, we need to consider that the monomeric unit in polybutadiene is 1,3-butadiene:
[tex]CH_2=CH-CH=CH_2[/tex]
And takes the polymeric notation as:
[tex]-(CH_2=CH-CH=CH_2)_n-[/tex]
Thus, since we need three monomeric units, we bind them as shown on the attached picture, which shows the 1st, 2nd and 3rd ones. Moreover, note the two R's, which stand for the rest of the polymer as a general notation.
Learn more:
https://brainly.com/question/2762383https://brainly.com/question/8156064Please help I will give brainliest ;3
Answer:
oxygen, carbondioxide
carbondioxide, oxygen
Suppose that you are dissolving a solute into 500 mL of water at 0°C. You find that no more than 495 g of solute will dissolve. Calculate the solubility of the solute in g/L.
Answer:
500 m 495 g its 900 mL
Explanation:
Carbon tetrachlordie (CCI4) is ___
A. iconic
B. Covalent
Answer:
b
Explanation:
chemistry neeeeeeed help!
4. O²-
EXPLANATION
O²- has 16 electrons while Ne has 18 electrons. O²- is a molecule that has one electron added to each atom, meaning that there are two extra electrons which makes O²- the same electron configuration as of Ne atom.
PLS HELP
1. Describe the structure of atoms, including the electrical charges, the location (in or out of nucleus) and atomic mass (1 amu or
less than 1 amu) of the following particles:
Answer:
atomic
Explanation:
dropping bombs im atomic, 0 2 0 1 bit
1) What is the time a projectile object is in flight (in the air) if it is launched at a velocity of 15
m/s at an angle of 37 degrees?
2) What is the range (horizontal distance traveled) of this object?
3) What is the time a projectile object is in flight (in the air) if it is launched at a velocity of 47
m/s at an angle of 15 degrees?
4) What is the range (horizontal distance traveled) of this object?
5) What is the time a projectile object is in flight (in the air) if it is launched at a velocity of 60
m/s at an angle of 55 degrees?
6) What is the range (horizontal distance traveled) of this object?
Answer:
So the degree angle will be horizontally
Explanation:
Element with the largest electron cloud
Out of the answer choices, rubidium has the highest energy valence shell. With a single electron in the fifth energy level, krypton will have the highest number of energy levels of the group I elements listed.
kasama na po jan ang explenation
I need help with this
Answer:
87 (whatever unit its using)
write True If the statement Is Correct And False If Not
Answer:
11.false12.true13.true14.false15.true16.false17.false18.false19.true20.false21.PC22.CC23.PC24.CC25.CCExplanation:
I think it is helps you2. What is the proper coefficient for balancing oxygen in the complete combustion of
butane shown in the equation below
2 CH10+? 02->8 C02 + 10 H2O
A. 13
B. 4
C. 5
D. 6.5
Answer:
A
Explanation:
8×2 + 10×1 = 26
so to balance it:
26÷2=13
For the given combustion reaction of butane gas, there are total 26 oxygens in the product side. Thus, the coefficient of O₂ must be 13 to equate both sides.
What is a balanced chemical equation?The balanced chemical equation for a reaction represents the perfect stoichiometry of each reactants and products in the reaction. According to mass conservation law, the total mass in the product side must be equal to the total mass in the reactant side.
Therefore, each element must be equal in number on both side. The balanced equation for the combustion of butane is given below:
[tex]\rm 2 C_{4}H_{10} + 13 O_{2} \rightarrow 8 CO_{2} + 10 H_{2}O[/tex]
Now only the number of oxygen is balanced on both side. Hence, the proper coefficient for balancing oxygen in the complete combustion of butane gas is 13.
To find more on balancing reactions, refer here:
https://brainly.com/question/22064431
#SPJ2
a brief description of atoms and how they relate to
molecules and compounds
Answer:
Explanation:
Atoms are the thing that make up molecules and compounds. Molecules contain two or more atoms and are held together by covalent bonds
Question
How are chemical equations balanced?
Answer:
According to the law of conservation of mass, when a chemical reaction occurs, the mass of the products should be equal to the mass of the reactants. A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side
