Which is stronger an acid or an alkali
Answer:
.AN ACIDExplanation:
is the stronger
both will be equally strong because when you add them together with a pretty much equal ph such as 5 and 9 ph then it makes it neutral meaning they are just as strong as eachother
Identify by element's full name.
Answer:
1.a member of carbon family with 14 eletrons is silicon
2.halide which is liquid at room temperature is bromine
3.transition metal with 79 electrons/protons and neutron 80 for me Is Gold
How many grams in 25Kg?
Answer:
it adds up to 25000 grams
Given a thin sheet of tin foil as shown below, determine the thickness of the foil if the mass is 1.68 g and the density of tin is 7.31 g/cm^3. Show all of your work. Round your final answer to two digits and don't forget units. (4 points) *PLEASE HURRY*
Given :
Mass of foil , m = 1.68 g .
Density of foil , [tex]\rho=7.31\ g/cm^3[/tex] .
To Find :
The thickness of the foil .
Solution :
Let , length and breadth is l and b respectively .
Also , height be h .
Volume is given by :
[tex]V=l\times b\times h[/tex]
Density is given by :
[tex]\rho=\dfrac{m}{V}\\\\V=\dfrac{m}{\rho}\\\\l\times b\times h=\dfrac{1.68}{7.31}\\\\l\times b\times h=0.23\\\\h=\dfrac{0.23}{lb}[/tex]
Therefore , thickness of the foil is [tex]\dfrac{0.23}{lb}[/tex] .
Hence , this is the required solution .
is Gatorade a compound or an element
Answer:
Element...follow me and mark me brainliest
Answer:
A compound because it cannot be found on the periodic table
Explanation:
If there are three naturally occurring isotopes of the hypothetical element R. The R-64 isotope has a 48.89% abundance and mass of 63.929 amu. The R-65 isotope has a 27.81% abundance and mass of 65.996 amu. The R-67 isotope has a 23.30% abundance and mass of 67.002 amu. Calculate the average atomic mass of the hypothetical element R.
Answer:
65.21g
Explanation:
[tex](48.89 \div 100) \times 63.929 = 31.25 \\ (27.81 \div 100) \times 65.996 = 18.35 \\ (23.3 \div 100) \times 67.002 = 15.61 \\ 31.25 + 18.35 + 15.61 = 65.21[/tex]
round 0.000789 to 2 significant figures
Answer:
0.00079
Explanation:
Any zero after the decimal isn’t a significant figure
NASA uses radar to track as much space junk as possible, but it's estimated that millions of pieces
aren't being detected. Why?
a. These pieces are too small.
b. Junk that is made of metal reflects radio waves.
c. NASA's radar covers only the area of space above North America.
d. All of the above
Is Iodine more or less reactive compared to Lithium?
Iodine is less reactive
Answer: Iodine is less reactive in comparison to Lithium
I need help please.
Number of
Protons
Number of
Neutrons
Atomic
Number
Mass
Number
Element
(symbol)
20
20
А
B
С
9
D
E
19
F
Using the periodic table, complete the table to describe each atom. Type in your answers.
Answer:
A = 8
B = 8
C = O ( Oxygen )
D = 26
E = 30
F = Fe (Iron)
Explanation:
1)To get "A" we use the following formula
mass number = number of protons + number of. neutrons
15 = number of protons + 7
15 - 7 = number of protons
8 = number of protons
A = 8
2)To find "B"
atomic number = number of protons
Atomic number = 8
B = 8
3)To find "C"
the atomic number is 8 so the element which
has 8 atomic number on periodic table is Oxygen.
C = oxygen
4) To get "D"
Number of protons = atomic number
number of protons = 26
D = 26
5)To get "E"
mass number = number of protons + number of. neutrons
56 = 26 + number of neutrons
56 - 26 = number of neutrons
number of neutrons = 30
E = 30
6) To find "F"
The atomic number is 26 so the element which has 26 atomic number on periodic table is Iron.
hope it helps
for any question comment me ❤❤
2. Magnesium is an alkaline earth metal. With which group of elements is magnesium most reactive?
F. nonmetals
G. noble gases
H. alkali metals
J. transition metals
Answer:
alkali metals
Explanation:
alkali metals
The alkali metals, found in group 1 of the periodic table (formerly known as group IA), are very reactive metals that do not occur freely in nature. These metals have only one electron in their outer shell. Therefore, they are ready to lose that one electron in ionic bonding with other elements.
plz mark me as brainliest
How many grams of carbon (C) would be present in carbon monoxide (CO) that contains 2.666 grams of oxygen (O)? For example if the sample size was 10 L or 10,000 L.
Given :
Mass of oxygen containing carbon monoxide (CO) is 2.666 gram .
To Find :
How many grams of carbon (C) would be present in carbon monoxide (CO) that contains 2.666 grams of oxygen (O) .
Solution :
By law of constant composition , a given chemical compound always contains its component elements in fixed ratio (by mass) and does not depend on its source and method of preparation.
So , volume of solution does not matter .
Moles of oxygen , [tex]n=\dfrac{2.666}{16}=0.167\ mole[/tex] .
Now , molecule of CO contains 1 mole of C .
So , moles of C is also 0.167 mole .
Mass of carbon , [tex]m=12\times 0.167=2\ g[/tex] .
Therefore , mass of carbon is 2 grams .
Hence , this is the required solution .
A science class is conducting an experiment that produces noxious fumes. Because of inadequate ventilation, some students begin to feel nauseated and dizzy. The first response should be to
To solve this we must be knowing each and every concept related to experiment. Therefore, the correct option is option A that is to leave the room and go to an area with fresh air.
What is experiment?Any procedure where measurements are taken and tests are run to support or disprove a hypothesis is referred to as a scientific experiment.
A science class is conducting an experiment that produces noxious fumes. Because of inadequate ventilation, some students begin to feel nauseated and dizzy. The first response should be to leave the room and go to an area with fresh air.
Therefore, the correct option is option A that is to leave the room and go to an area with fresh air.
To learn more about experiment, here:
https://brainly.com/question/11205647
#SPJ1
which heat source would keep the pizza the warmest.
Answer:
a lot of heat source
Explanation:
Science can lead to the development of:
3. The dry air in the Alps helped to prevent damage to the cells in the Iceman's body.
(1 Point)
true
false
is this true or false ?
Answer:
False
Explanation:
because they do not prevent damage they make damage
In Rutherford's experiment, when particles strike the
zinc sulfide screen, they produce flashes of light or
scintillations which can be detected.
A-Gamma
b -Meson
C-Beta
d Alpha
Answer: D- Alpha
Explanation:
In which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products? A.Zn + 2HCl → H2 + ZnCl2 B.Li2CO3 → LiO + CO2 C. CO2 + H2O → CH2OH + O2 D. CH4 + O2 → CO2 + 2H2O
Answer:
A.
Explanation:
The chemical equation in which the number of atoms in the reactants is the same as that of products would be Zn + 2HCl → H2 + ZnCl2. The correct option would be A.
Let us consider all the component atoms in the equation: Zn + 2HCl → H2 + ZnCl2
Zn: 1 atom in the reactant side and 1 atom in product sideH: 2 atoms in reactant side and 2 in product sideCl2: 2 atoms in reactant side and 2 in product side.In Li2CO3 → LiO + CO2:
2 atoms of Li are in reactant side and only 1 in product sideIn CO2 + H2O → CH2OH + O2
2 atoms of H are in reactant side while 3 are in product sideIn CH4 + O2 → CO2 + 2H2O
Only 2 atoms of O are in reactant side while 4 are in product side.Hence, the only equation in which the number of atoms in the reactants is the same as that of products is Zn + 2HCl → H2 + ZnCl2
More on balancing chemical equations can be found here: https://brainly.com/question/21049751
the precautions that must be taken when carrying out experiments with hydrogen gas
Explanation:
Never smoke near a place where hydrogen is generated or being used. Remove all possible sources of flame and sparks. Hydrogen should only be generated and used in a well ventilated out door area. Precautions must be taken to remove all possibilities of fire or explosion.
a 20.0g sample of an element contains 2.16x10^23 atoms identify the element
Answer:
yes
Explanation:
Vanadium has an atomic mass of 50.9415 amu. It has two common isotopes. One isotope has a mass of 50.9440 amu and a relative abundance of 99.75 %. a) What is the abundance of the other isotope? b) What is the mass of the other isotope?
Answer:
this does not look like chemistry but I believe your answer is 50.9439
Explanation:
hope it helps
Find the volume of a rock made out sandstone with a density of 2.4 g/cm^3 and a mass of 8.5g.
Which of the following substances is used up during photosynthesis?
why did the atomic model theory change over time
Answer:
The atomic theory has changed over time as new technologies have become available. Scientific knowledge builds on past research and experimentation. 400 B.C. Democritus, a philosopher in ancient Greece, began the search for a description of matter.
Explanation:
A 5.32 g mixture contains both lithium fluoride, LiF, and potassium fluoride, KF. If the mixture contains 3.12 g fluorine, what is the mass of the KF in the mixture? mass of KF = _______ g Please only answer if you're going to answer seriously
Answer:
The mass of KF in the mixture is 2.77 gms.
Explanation:
Given;
Total weight of mixture (LiF+KF)=5.32gms
Let, mass of KF in the mixture = x gms
⟹ mass of LiF in mixture =(5.32-x)gms.
We know that :
Atomic weight of F=19gms.
Atomic weight of Li =7gms.
Atomic weight of K = 39 gms.
moles=mass/(molecular weight)
Thus, moles of KF=x/58
and moles of LiF = (5.97-x)/26LiF=(5.97−x)/26
Thus,
moles of F in KF=moles of KF=x/58 ---(1)
moles of F in LiF =moles of LiF= (5.32-x)/26---(2)
From (1) & (2),
Total moles of Fluorine
=(x/58)+((5.32-x)/26)
Hence,
total weight of Fluorine in sample = moles*Atomic weight
=((x/58)+((5.32-x)/26))*19gms.
=3.12 gms.---(given)
Now, solving the equation for x,
26x +(5.32*58)-58x
=3.12*58*26/19
22x=308.56-247.62
x=60.94/22
=2.77 gms. (Answer)
Thus, the mass of KF in the mixture is 2.77 gms.
The ancient philosophers discussed the world around them
but did not do any experiments or detailed observations.
TRUE
FALSE
Answer:
FALSE
Explanation:
Match the term with the definition. Match Term Definition Condensation A) A phase change from a gas to a liquid Melting B) A phase change from a liquid to a solid Sublimation C) A phase change from a solid to a liquid Freezing D) A phase change from a solid to a gas
OK, so since this question is corrupt, lets fix this.
Answer:
1. Sublimation: C
2: Melting: B
3: Freezing: D
4: Evaporation: A
Explanation:
In the lesson, we learned that Sublimation is like a solid turning into gas (vapor). For melting, we learned that it is a solid that turns into a liquid, example of melting is snow turning into water. For Freezing, we learned that it is a liquid turning into a solid, example of freezing is water turning into snow. For evaporation, it is a solid turning into a gas like vapor for example, example of evaporation: We know that when we mix Dry Ice with water, we get a chemical reaction, Dry Ice with water creates carbon dioxide smoke (fog).
Hope this answer helps!
I had this on my science test! A liquid changes into a solid is called freezing or solidation. The process of a solid becoming a liquid is called melting. A gas changes to a solid is called sublimation. When a gas changes into a liquid, it is called condensation. A liquid changes to a gas is called evaporation!
I never ask, but can I have Brainlest PLS?
In any chemical reaction, the quantities that are preserved are O A. the number of moles and the volumes B. the number of molecules and the volumes 0 C. mass and number of atoms D. mass and moles
Explanation:
Law of conversation of mass applies in any chemical reaction.
The number of moles can be different for each compound being used, as it is based on the different molar masses of each compound.
Hence, the answer is C. mass and number of atoms.
Brainliest! Please help me out with this table!! :(
