Answer:
C.) 2.95 x 10^24
Explanation:
make a ratio
1 mole = molar mass x 6.023 x 10^23
# moles = x
1 mole= 22.9 x 6.023 x 10^23
4.9 moles= x
cross multiply
then divide
= 2.95 x 10^24
Need help ASAP plz. Only gave 10 min
Answer:
the answer is D
Explanation:
How Do I Make A Nuclear Bi - Fusion In Between Earth Will Give Brainlyest
Answer:
Use A Nuclear Condenser Add It With A Nuclear Transfer Pipe Conecting With a Tessoract And There You Go!
Explanation:
define
properties of gases
have a great day
Answer:
Gases have three characteristic properties: (1) they are easy to compress, (2) they expand to fill their containers, and (3) they occupy far more space than the liquids or solids from which they form.
Explanation:
Calculate the average atomic mass of an element that has an isotope with a mass of 11.00 amu (60% abundance) and another isotope with a mass of 10.53 (40% abundance). What is this element? Make sure to prove this with your math calculations.
Answer:
Helium
He
atomic number 2.
It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas,
Explanation:
These different types of helium atoms have different masses (3 or 4 atomic mass units ), and they are called isotopes. For any given isotope, the sum of the numbers of protons and neutrons in the nucleus is called the mass number. This is because each proton and each neutron weigh one atomic mass unit (amu). By adding together the number of protons and neutrons and multiplying by 1 amu, you can calculate the mass of the atom. All elements exist as a collection of isotopes. The word ‘isotope’ comes from the Greek ‘isos’ (meaning ‘same’) and ‘topes’ (meaning ‘place’) because the elements can occupy the same place on the periodic table while being different in subatomic construction.
Which is shown below = 55 = 2 + 53
A. An expression
B. an operation
C. An equation
D. an inequality
Answer:
that answer would be A. an expression
potassium hydrogen carbonate
Answer:
3
Explanation:
jdidsolslwoekdldloeo we
Will the average vibrational energy of nitrogen gas (N2) at 22 c be greater than, less than, or equal to the average vibrational energy of NaCl at 22 c?
The average vibrational energy of nitrogen gas (N₂) at 22 c be greater than the average vibrational energy of NaCl at 22 c.
The average distance between molecules of gaseous substance is greater than the average distance between molecules of liquid and solid substance.
The molecules of the gaseous substances always move with greater speed due to large distance between the molecules.
The molecules of a solid substance are closely packed together and this reduces the average speed of the molecules.
Nitrogen gas (N₂) is a gaseous substance while sodium chloride (NaCl) is a solid substance.
Thus, we can conclude that the average vibrational energy of nitrogen gas (N₂) at 22 c be greater than the average vibrational energy of NaCl at 22 c.
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against at -20 degree centigrade occupied the volume of one 40 ml calculate the temperature at which the volume of cash pickup 65ml pressure remain constant
The final temperature :T₂=411.125 K = 138.125 °C
Further explanationGiven
T₁=-20 °C+273 = 253 K
V₁=40 ml
V₂=65 ml
Required
Final temperature
Solution
Charles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
Input the value :
T₂=(V₂.T₁)/V₁
T₂=(65.253)/40
T₂=411.125 K = 138.125 °C
Convert 22.5 grams H2O to moles
Answer:
1.25mol
Explanation:
moles(n)=mass/Mr
Mr of H2O=(1*2)+16
=18
n=22.5/18
=1.25 mol
1.25 mol
The equation for the calculation of mass is as follows:-
[tex]moles(n)=mass(g)/molar mass(g/mol)[/tex]......(1)
Given:-
Mass of water =22.5 g
Molar mass of water=18 g/mol
Subsitute both the values in the equation (1) as follows:-
[tex]n=22.5\ g/18\ g/mol\\=1.25 mol[/tex]
Hence, the value in moles is 1.25 mol.
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List 3 chemical compositions of magma
(Earth science)
Answer:
iron, magnesium, and calcium but low in potassium and sodium.
What number minus 6 equals 58?
Answer: 64
Explanation:
Answer:
64
Explanation: add 6 to 58 and you get 64.
Scientists have measured a cheetah running across the savanna at 70 m/s. Which of these data accurately measured the cheetah’s speed?
480 m in 6 sec
600 m in 10 sec
210 m in 3 sec
300 m in 5 sec
Answer:
210 m in 3 sec
Explanation:
The speed of the Cheetah is given to be 70m/s .
We know that:
Speed = [tex]\frac{distance }{time}[/tex]
Now we find the choice that gives 70m/s:
480 m in 6 sec
Speed = [tex]\frac{480}{6}[/tex] = 80m/s
600 m in 10 sec
Speed = [tex]\frac{600}{10}[/tex] = 60m/s
210 m in 3 sec
Speed = [tex]\frac{210}{3}[/tex] = 70m/s
300 m in 5 sec
Speed = [tex]\frac{300}{5}[/tex] = 60m/s
So the solution is 210 m in 3 sec
Convert 34.4 lb to g. (1 lb = 453.6 g) A) 7.58 X 10-2 g B) 1.56 X 103 g C) 7.58 X 104 g D) 1.56 X 102 g E) 1.56 X 104 g
Answer:
E) 1.56x10⁴g
Explanation:
Pounds and grams are both units of mass. Pounds are used in UK and USA. Grams is the unit of mass used in the international system of units, SI.
To convert pounds, lb, to grams, g, we need the equivalence between these 2 units of mass:
1lb = 453.6g
That means 1lb weighs 453.6g. 34.4lb weigh:
34.4lb * (453.6g / 1lb) = 1.56x10⁴g. That means right option is:
E) 1.56x10⁴g5) How many grams of C6H6 are present in 12.70 moles of C6H6?
Answer:
991.997
Explanation:
no of moles=given mass/molar mass ----1mass of benzene=78.11moles=12.7applying equation 112.7=mass/78.11mass of [tex]C_{6}H_{6}[/tex]=991.997hope this helps youQuestions
1 What conclusions can you draw about each element?
a It is malleable, and reacts with chlorine on heating.
Answer:
It is a metal
Explanation:
One of the properties of metals is that metals are malleable. What we mean by malleability is that the metal can be hammered into sheets that can be used for different applications.
Also, metals can react with chlorine when heated to yield diverse halides. This is true of most metal elements.
If you have 100g of KMnO how many moles do you have?
0.9 mol KMnO
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
100 g KMnO
Step 2: Identify Conversions
Molar Mass of K - 39.10 g/mol
Molar Mass of Mn - 54.94 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of KMnO - 39.10 + 54.94 + 16.00 = 110.04 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 100 \ g \ KMnO(\frac{1 \ mol \ KMnO}{110.4 \ g \ KMnO})[/tex]Divide: [tex]\displaystyle 0.90876 \ mol \ KMnO[/tex]Step 4: Check
Follow sig fig rules and round. We are given 1 sig fig.
0.90876 mol KMnO ≈ 0.9 mol KMnO
In which of these substances did the individual atoms combine together in a chemical reaction?. Single choice.
Answer:
hello the options related to your question is missing hence I will give you a general answer as regards to combination of atoms in a chemical reactions
answer :
In a chemical reaction the bonds that are found between the atoms of reactants are broken up and a different/new bonds are formed between the atoms of the various reactants involved in the chemical reaction to produce a new product. during this process no new atoms are created but new bonds are created to form a product
Example of such substance where atoms can combine together in a chemical reaction is : Iron sulfide [ Fe(s) + S(s) → FeS(s) ]
Explanation:
In a chemical reaction the bonds that are found between the atoms of reactants are broken up and a different/new bonds are formed between the atoms of the various reactants involved in the chemical reaction to produce a new product. during this process no new atoms are created but new bonds are created
Example of such substance where atoms can combine together in a chemical reaction is : Iron sulfide [ Fe(s) + S(s) → FeS(s) ] i.e. combination of Iron atoms and sulfur atoms
I guess you didn’t mean what u wrote in that song about meee
You said forever now I drive past your street
Answer:
and your probably with that blond girl who always me
doubt she so much older than me she's every thing i'm in insecure about
Explanation:
Answer: and all my friends are tired of hearing how much i miss you but i kinda feel sorry for them cause they'll never know you the way i do , yea today i drove through the suburbs and pictured i was driving home to you.
Explanation:
Explain this statement in your own words and give an example. The properties of the substances around us depend on the atoms and molecules that compose them.
Answer:
See explanation
Explanation:
Substances are composed of atoms. The combination of atoms in a substance determines the properties that the substance exhibits.
For instance, if atoms of metals and nonmetals combine, they give rise to ionic substance which are mostly solid and have high melting and boiling points.
On the other hand, atoms of nonmetals combine with each other to form covalent substances having low melting and boiling points and high vapour pressure sometimes.
Similarly, the kind of molecules present in a substance also determine the nature of the substance. For instance, the high boiling point of water is attributed to the polarity of the O-H bond. This explains why it has a much higher boiling point than CH4 of comparable molar mass but is a non-polar molecule.
What measures the number of protons and neutrons in an atom?
-Atomic Number
-Atomic Mass
-Isotopes
-Olons
Answer: atomic mass
Explanation:
Mass Number. The mass number (A) of an atom is the total number of protons and neutrons in its nucleus. The mass of the atom is a unit called the atomic mass unit (amu).
A student mixes sugar and water until the sugar dissolves. This an example of a
HELP PLS !!
Answer:
The sugar water mix is a mixture.
Answer:
Physical change
Explanation:
Because sugar molecules are dispersed within the water but the individual sugar molecules are unchanged
Geologists use radioactive dating to determine the absolute ages of rocks. *
True
False
why does a new flu shot need to be made each year ?
because we could be sick if don't get the shot there is a higher chance to have the flu
balence the equation : _____ Ga2O3 + _____ Li -----------> ______ Li2O + ______ Ga
Answer:
Ga2O3 + 6Li ------> 3Li2O + 2Ga
Answer:
1 Ga2O3 + 6Li——-> 3 Li2O + 2 Ga
Explanation:
when the foil is negatively charged will all of the foil still be made up of aluminum atoms
Answer:
Yes.
Explanation:
Electric charge cannot change the elemental composition of a substance.
The application of charge to the aluminium foil does not change the composition of the foil and hence the foil will still be made up of aluminium atoms.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Why pure hydrogen is not used in ballons ?
Answer: Hydrogen that is not used in balloons because hydrogen burns very easily.
pls mark brainliest
hydrogen monofluoride
Answer:
what's the question man
Explanation:
If a 50 kg student is pushed in a rolling chair with a force of 20 N, what is the student’s acceleration?
2.5 m/s2
4 m/s2
1,000 m/s2
0.4 m/s2
Answer:
0.4m/s²
Explanation:
Given parameters:
Mass of student = 50kg
Force = 20N
Unknown:
Acceleration = ?
Solution:
From Newton's second law of motion,
Force = mass x acceleration
Acceleration = [tex]\frac{Force }{mass}[/tex] = [tex]\frac{20}{50}[/tex] = 0.4m/s²
Paul has different spoons for cooking. He told Sue that he likes to stir hot food so he does not burn his hand. Sue disagreed. She said there was no difference between wooden and metal spoons. Was Sue right? Explain.
Explanation:
Metal is a better conductor than wood, so a metal spoon could burn
Paul's hand. So, Sue is incorrect. The metal being good conductor of heat, heats up faster than wood spoon and thus, could burn Paul's hand.
What is a chemical formula?
A. An identification of the atoms in a molecule
B. The arrangement of electrons in an atom
C. Instructions on how a chemical is made
D. Two or more atom's bonded together
Answer:
A. An identification of the atoms in a molecule
Explanation:
The chemical formula of a compound is a representation which shows all the elements therein and the mole relationship between them expressed as subscripts.
Therefore, a chemical formula allows us to identify atoms that are within a molecule.
A molecule is a covalent compound that has discrete or separate units.
For example;
HCl represents 1 mole of hydrogen chloride molecules consisting of 1 mole of hydrogen atoms and 1 mole of chlorine atoms.
