Answer:
Alkali metals are highly reactive elements that appear to be silver and they are found in group 1 of the periodic table. It consists of lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). As you go further down the group, the more reactive they are. Those elements all react to water and air, so they must be kept in oil to preserve their state.
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.
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
Different elements have different numbers of:
Subatomic particles.
Protons.
Electrons.
All of the above.
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
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
Use the rules of significant figures to report the answer to this math question: (454.3 cL x 17.84 dL )/3.1 L =
Answer:
2614.423226
Explanation:
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.
What is hydrochloride acid plus water plus salt and water
how do you write out 4,5-dimethyl-4-octene
you can see the answer at the pic
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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which property of a sound wave is related to the pitch of the sound?
Answer:
Frequency
Explanation:
I do not see the options but I know the answer:
The frequency of a sound wave is what your ear understands as pitch. A higher frequency sound has a higher pitch, and a lower frequency sound has a lower pitch.
If you find my answer helpful
Pls consider marking my answer as Brainliest! It would mean a lot!
Answer:
frequency
Explanation:
vaild
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
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=searchResultsHELP 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'.
Express 14.80 × 12.10 × 5.05 in scientific notation with the proper significant figures.
32 N of Force. 37 N force. How strong is the net force and in which direction?
explanation of atomic radius
Ah yes.
The atomic radius is basically the distance between the nucleus of the atom and the outermost electron in the farthest orbital of the atom. The more bigger the atomic radius , the less powerful is the force that holds together the nucleus and its electrons.
A neutral atom of sulfur becomes an ion with a negative two charge by?
Answer:
The valence shell (the 3s and 3p sublevels) contains six electrons, but it needs eight to become stable. Think of the octet rule. Therefore a sulfur atom will gain two electrons to form the sulfide anion with a charge of 2− , with the symbol S2− .
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 (:
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------------------------------------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
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.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
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:
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:
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.
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 :)
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 :)
Ore deposits contain high amounts of
A) water
B) volcanic magma
C) metals
D) minerals
How do you think changes in temperature can cause movement of air and other fluids on Earth?
Where on Earth's surface might you be if you are experiencing the trade winds? Explain how air pressure, temperature, and the Coriolis effect in movement and direction of thesewinds.
""The polar easterlies"-is dry and cold prevailing winds that blow from the high pressure areas of the polar highs at the north and south poles towards low pressure areas within the Westerlies at high latitudes.
Cold air diminish at the pole making the high force, Pushing an equator-ward discharge, of air; that outflow is then Sidetrack westward by the Coriolis effect."
Hoped This Helped,
Your Welcome :)