Answer:
Answer Below
Explanation:
When you leave an apple on a table outside it will turn brown. This happens because when you cut an apple, you are exposing it's insides to the oxygen in the air. This causes the PPO (polyphenol oxidase) enzyme in the apple's flesh to oxidize the polyphenols, turning them into some other brown colored products. Hence, the color change.
Answer:
brown i can't explain because its a matter of the atoms in the apple mixing with the air and apple is made with nitrogen
Which of the following is used for chemical symbols today? a. drawings c. letters b. icons d. numbers
Answer:
Letters
Explanation:
For example, today we use the periodic table which is full of elements named with 1 or 2 letters. Like how Helium is He and Sodium is Na. Hope this helps!!!
Chemical symbols are used to identify an element and it is represented by one or two letters from their latin name. Thus option c is correct.
What is chemical symbol?Chemical symbols are representations for elements and compounds. Each element in the periodic table have their own symbol which first letter or first two letters from their latin name.
For example, hydrogen has the symbol H, oxygen is O, N for nitrogen C for carbon, Na for sodium etc. The latin name of sodium is natrium, that's why it has the symbol Na.
The letters used in the chemical symbol must be capital. If two letters are there like in Na, Ar etc. the first letter be capital and second letter have to be in small case.
In a similar way compounds can be represented using chemical symbols with number of each atom given as subscripts of the elemental symbol as in CO₂, H₂O etc.
To find more on chemical symbol, refer here:
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Express 14.80 × 12.10 × 5.05 in scientific notation with the proper significant figures.
Pls help I need it ASAP!!!
Answer:
B
Explanation:
because water has the always has the same volume but it can change shape of the glass or container that it is put in
how do you write out 4,5-dimethyl-4-octene
you can see the answer at the pic
An 8th grade goes to a restaurant for dinner with their family. At dinner, the student orders iced tea. The ice and tea combined to weigh 210 grams. The student then added sugar and lemon to their tea. The sugar weighed 20 grams and the lemon weighed 15 grams. After adding the sugar and lemon, the student stated the tea weighs 225 (210 grams ice & tea + 15 grams lemon) grams since only the lemon would add weight to the tea because the sugar was dissolved. Do you agree or disagree with the statement? Justify your choice.
Answer:
Disagree, the total mass is 245 grams.
Explanation:
We need to keep in mind the Law of Conservation of Mass. Each gram added to the lemonade (a system) will remain there unless it is somehow removed. The added mass of both sugar and lemon count for the total mass (210+20+15), even if the sugar was dissolved.
HELP PLEASE
The production of a_____
is evidence that a chemical reaction has occured. This occurs when a solid is formed by the reaction.
Answer:
Precipitate
Explanation:
Precipitate is defined as the creation of a solid from a solution. When the reaction occurs in a liquid solution, the solid formed is called the 'precipitate'.
Match the terms below to the correct definitions
3. Atom
1. The mass on the periodic table.
b. Electrons
2. Region surrounding the nucleus where electrons are found.
C. Protons
3. Positively charged center of an atom.
d. Neutrons
4. Particles that differ in number between isotopes.
e. Electron
cloud
5. Vertical column in the periodic table.
1. Nucleus
6. Positively charged particles in an atom.
R. Quark
7. Negatively charged particles in the outermost energy levels of the electron cloud.
8. Table that organizes the elements by properties.
9. Atoms of the same element that have different masses.
h. Atomic
number
1. Mass number
10. Smallest known particle that makes up protons and neutrons.
j. Average
atomic mass
11. All elements in the same one of these has the same number of energy levels in
their electron cloud.
k. Isotopes
12. The smallest form of matter that still retains the properties of an element.
1. Valence
electrons
13. Negatively charged particles in an atom.
m. Group
14. The sum of protons and neutrons in an atom.
n. Period
15. Represents the identity of an element.
o. Periodic
Table
Answer:
Explanation:
1=i
4=d
5=m
6=c
8=o
9=j
10=a
13=b
14=h
15=l
Theses are the ones i knew
I'd is 643461717 and password is dynamo
Answer:bet
Explanation:
what is ch2cl2 bond angle?
Answer:
109.5
Explanation:
It's a tetrahedreal with four bonds
PLEASE HELP!
Why do atoms share electrons in covalent bonds?
A. to attain a noble-gas electron configuration
B. to become more polar
C. to become ions and attract each other
D. to increase their atomic numbers
Answer:
Answer Option A) To attain a noble-gas electron configuration.
Explanation:
Correct answer from test
Taking into account the definition of covalent bond and octet rule, the correct answer is option A. Atoms share electrons in covalent bonds to achieve a noble gas electron configuration.
The covalent bond is the chemical bond that occurs between atoms of non-metallic elements. These atoms have many electrons at their outermost level and have a tendency to share them to acquire the stability of the noble gas electronic structure. In this way a molecule is formed.
The tendency of the elements to reach a stable configuration is known as the octet rule. For this, the octet rule explains that there must be eight electrons in their last energy levels, thus acquiring the structure of a noble gas.
So, a covalent bond is a force that joins two atoms of non-metallic elements to form a molecule in order to comply with the octet rule.
Finally, the correct answer is option A. Atoms share electrons in covalent bonds to achieve a noble gas electron configuration.
Learn more:
https://brainly.com/question/14149997?referrer=searchResultshttps://brainly.com/question/12694836?referrer=searchResultshttps://brainly.com/question/2959530?referrer=searchResults32 N of Force. 37 N force. How strong is the net force and in which direction?
Please help me on Q2
I’ll be so incredibly grateful!!
Answer:
No. of neutrons = 27 - 13 = 14
No. of protons = No. of electrons = 13
Hope it helps you
please help:)!!!!
important
Answer:
I beleive its the middle/second option :)
Explanation:
Sorry if I'm wrong but Newton's third law is "for every action (force) in nature there is an equal and opposite reaction." meaning if object A exerts a force on object B, then object B also exerts an equal and opposite force on object A so I beleive the moon would push up on the astronaut with a force of 300 N
I hope this helps, have a good day :)
28 grams of H2 are produced from an experiment. How much volume would they displace at STP?
Answer: 0.86 "L" 1 "mol" of "Zn" has mass of 65.39 "g". The amount of "Zn" is frac{2.5 "g"}{65.39 "g/mol"} = 0.038 "mol". The amount of "H"_2 produced is the same as the amount of "Zn" consumed (0.038 "mol").
Explanation:
Help please and explain so I could see you didn’t guess
Answer:
A
Explanation:
because the acid in your stomach can break down anything that you eat causing you to have to use the restroom
NEED HELP BY 1:30 PLZ EXTRA POINTS !!
Answer:
1. Solid Definition: firm and stable in shape; not liquid or fluid.
Example: A hard kitchen countertop.
2. Crystalline Solid Definition: Crystalline solids consist of atoms, ions and molecules arranged in definite and repeating three-dimensional patterns in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.
Example: Salt, diamonds
3. Amorphous Solid Definition: an amorphous or non-crystalline solid is a solid that lacks the long-range order that is characteristic of a crystal.
Example: rubber, plastic, and gels
4. Liquid Definition: A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a constant volume independent of pressure. As such, it is one of the four fundamental states of matter, and is the only state with a definite volume but no fixed shape.
Example: Water, juice, rain
5. Surface Tension Definition: the tension of the surface film of a liquid caused by the attraction of the particles in the surface layer by the bulk of the liquid, which tends to minimize surface area.
Example: Walking on water: Small insects such as the water strider can walk on water because their weight is not enough to penetrate the surface.
Explanation:
you're welcome, brainliest please (:
Different elements have different numbers of:
Subatomic particles.
Protons.
Electrons.
All of the above.
The atomic masses of elements are generally not whole numbers. Explain why.
Answer:
Because elements have isotopes.
Explanation:
So the atomic mass is the average of an element's isotopes.
Answer:
The atomic masses of most elements are not whole numbers, because they are a weighted average of the mass numbers of the different isotopes of that element, with respect to their abundances in nature.
Explanation:
What is hydrochloride acid plus water plus salt and water
What is the mass of 8.250 moles of Cu2O?
Answer:
How many moles CU2O in 1 grams? The answer is 0.0019838596354237. We assume you are converting between moles CU2O and gram. You can view more details on each measurement unit: molecular weight of CU2O or grams The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles CU2O, or 504.06792 grams. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between moles CU2O and gram. Type in your own numbers in the form to convert the units
Insoluble substances can dissolve in all solvents
True or false
Answer:
Not all substances dissolve in all solvents
Explanation:
In chemistry, a common rule for determining if a solvent will dissolve a given solute is "like dissolves like." Solvents composed of polar molecules, such as water, dissolve other polar molecules, such as table salt, while nonpolar solvents, such as gasoline, dissolve nonpolar substances such as wax. Some substances are strong enough to not dissolve.
1. Matter that is composed of two or more different
elements chemically combined in a fixed proportion
is classified as
A) a compound
C) a mixture
B) an isotope
D) a solution
The number of grams of the solution if you were given 25.00 mL of the ethanol with a
density of 0.79 g/mL
Answer:
The answer is 19.75 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question we have
mass = 25 × 0.79
We have the final answer as
19.75 gHope this helps you
Provided is a diagram showing forces on a box.
Left
Right
40 Newtons
35 Newtons
What is the net force on the box?
SN Leht
O5N Right
75 N Let
O 75 N Right
please hurry i’m taking a test
Answer:
5 N left
Explanation:
trust me cccuuhh
Calculate the net force
175 N
1125 N
Answer:
_____________&_________Net force = sum of all forces with directionsso.....NET FORCE = 125+(-75) = 50 N in the direction of yellow t-shirt man------------------------------------Noble gas configuration
Answer:
Rubidium= [Kr] 5s^1
Calcium= [Ar] 4s^2
Aluminium= [Ne] 3s^2 3p^1
Explanation:
A noble gas configuration begins with the elemental symbol of the last noble gas prior to the atom. The symbol is then followed by the remaining electrons.
Hope this helped! good luck :)
Why MgO will form after Mg reacting with CuO? (mcq)
Mg forms positive ions and O forms negative ions
Mg is more reactive than Cu
CuO have loose bonding
Answer:
Mg is more reactive than Cu
Explanation:
In the reaction between Mg and CuO to form MgO, MgO will form because Mg is more reactive than Cu.
This kind of reaction is called a single replacement or single displacement reaction.
The replacement of a metallic ion in solution by a metal atom higher in the activity series than the metal in solution falls into this category of reactions. The element Mg is higher than Cu in the activity series. The higher an element is in the activity series, the more reactive they are. Since Mg is more reactive, it will displace the Cu from CuO.A calcium atom will react with two atoms of chlorine to form calcium chloride, CaCl 2. What other element will likely react the same way with chlorine?
1Neon
2Lithium
3Rubidium
4Strontium
Answer:
Strontium
Explanation:
If you look at the periodic table, you can see that strontium and calcium are in the same column. This means that they will have the same charge. Since they have the same charge, they will react the same way with chlorine.
There are two types of physical changes and chemical reactions- endothermic and exothermic. On the diagram below, which picture (A or B) is endothermic and which picture (A or B) is exothermic? Be sure to explain your reasoning for both.
Answer:
it is b because its releases heat in to all directions and not b because it staying inside and not releasing anything :)
Explanation:
Answer:
In ice cube heat is taken in absorbed it's an endothermic reaction
In fire heat is given out it is an exothermic reaction
Explanation:
Wanna give you one advice
Exit of heat means exothermic and you can memorize it by
The first word of both word exit ;exo
Hope it helps you
how to check atomic mass?
Answer:
There are multiple ways to check mass but I'll tell you one. Look below
Explanation:
One easy way of checking atomic mass is by adding protons and neutrons.
For example:
We have 5 protons and 4 neutrons.
5+4=9
I hope this helps (: