Answer:
[tex]\boxed {\boxed {\sf A. \ About \ 5.14 *10^{24} \ molecules \ H_2O}}[/tex]
Explanation:
To convert from moles to units, we must use Avogadro's Number: 6.022 * 10²³
This tells us the number of units (molecules of water in this problem) in 1 mole of a substance (water). We can use it as a ratio or fraction.
[tex]\frac{6.022 *10^{23} \ molecules \ H_2O}{1 \ mol \ H_2 O}[/tex]
Now, we can multiply this fraction by the moles of water (8.54) given.
[tex]8.54 \ mol \ H_2O*\frac{6.022 *10^{23}\ molecules \ H_2O}{1 \ mol \ H_2 O}[/tex]
When we multiply, the moles of water will cancel out.
[tex]8.54 *\frac{6.022 \ molecules \ H_2O}{1 \ }[/tex]
Since the fraction has a 1 as a denominator, we can remove it. The problem will be a simple multiplication problem.
[tex]8.54*6.022 \ molecules \ H_2O[/tex]
[tex]5.142788*10^{24} \ molecules \ H_2O[/tex]
The original measurement of 8.54 has 3 significant figures (8, 5, and 4). Therefore, we must round our answer to 3 sig figs, which is the hundredth place in this case.
The 2 in the thousandth place tells us to leave the 4 in the hundredth place.
[tex]5.14 *10^{24} \ molecules \ H_2 O[/tex]
There are about 5.14*10²⁴ molecules of water in 8.54 moles.
Answer:
5.14 x 10^24 molecules of H2O.
Explanation:
just took the test
Select all that apply.
Exposure to excessive ultraviolet radiation can be harmful to your _____.
body
skin
breathing
health
Answer:
body skin health
Explanation:
Which device converts the mechanical energy of a spinning magnet into electrical energy?
30 protons 30 electrons how many nuetrons
Answer:
34 neutrons.
Explanation:
Hope this helps!!
What is the balanced form of the equation C2H6 + O2→CO2+H2O?
- 2C2H6 + 7O2→4CO2+6H2O
- C2H6 + O2→CO2+2H2O
- C2H6 + 3O2→2CO2+3H2O
- C2H6 + 5O2→3CO2+5H2O
Answer:
- 2C2H6 + 7O2→4CO2+6H2O
Explanation:
Answer:
2C2H6+7O2-->4CO2+6H2O
Hope this helps!
20. Sudan III is used to test for
A. cellulose.
B. fats and oils.
C. glucose.
D. protein.
E. starch.
Answer:
Lipid tests
Sudan III is a red fat-soluble dye that is utilized in the identification of the presence of lipids, triglycerides and lipoproteins. The Reaction: Sudan III reacts with the lipids or triglycerides to stain red in colour.
Answer:
I think soo fats and oils
Please help me!!!!!!!it is about elements on the periodic table. Please help!!!!!
Answer:
a\c enables the protons so therefore we duplicate the neutrons making for the first one 80 squared then subtracted by 201 and then do that for all
A decrease in temperature decreases
. The reaction rate will
Answer:
The reaction rate decreases with a decrease in temperature. ... Molecules joined by stronger bonds will have lower reaction rates than will molecules joined by weaker bonds, due to the increased amount of energy required to break the stronger bonds.
PLZ FASTLEY ANSWER The images show two metamorphic rock samples.
Left: light colored rock with coarse texture. Right: red and white rock with rounded grains and coarse texture.
Which statement accurately describes these rocks?
Both rocks are non-foliated.
Neither rock has randomly arranged grains.
Both rocks formed at Earth’s surface.
Neither rock formed through extreme heat or pressure.
Answer:
a
Explanation:
From the given images, it is clear that both rocks are non-foliated rocks because they don't have distinct repetitive layers. Hence option a is correct.
What are metamorphic rocks?Metamorphic rocks are formed through intense pressure and heating from the sedimentary or igneous rocks. Sometime the change n heat or pressure make the metamorphic rocks gets foliated.
Foliation occurs when pressure forces flat or elongate minerals within a rock to align. These rocks form a platy or sheet-like structure that reflects the pressure direction. There is no platy or sheet-like structure in non-foliated metamorphic rocks.
Non-foliated rocks can be created in a variety of ways. Some rocks, like limestone, are composed of minerals that are not flat or elongate. Therefore, the given rocks are non-foliated.
To find more on foliated rocks, refer here:
https://brainly.com/question/1984747
#SPJ2
A scientist thinks he found a new metal, so he published a paper about this metal. About 1 week after the scientist published the paper, you noticed a problem with the paper the scientist wrote. You noticed that this metal was not a new metal. In fact, this metal was discovered years ago. You determined this when you saw the atomic emission spectrum. As you read the article, you remembered that each atomic emission spectrum is unique to each element and the atomic emission spectrum matched one that was already discovered. Using the techniques from Chemistry, you ran a Flame Test with a piece of the metal (the metal is safe to use) that you had shipped to you. You found the metal turned the flame yellow. What metal did you have in your possession?
**ANSWER CHOICES**
*Barium
*Calcium
*Strontium
*Copper
*Sodium
Answer:
Sodium
because it burns with a yellow-orange flame.
Explanation:
It relates with Barium which burns with yellowish green flame
SOMEONE HELP ME PLEASE I’LL GIVE BRAINLY
Answer:
i think that describes cohesion or hydrolysis
Explanation:
What is the frequency of a light wave who has a wavelength of 5.5 x 10-14 m v
Answer:5.45×10^21
Explanation:
Use:f=c/λ
How many H2O molecules are in 2 mol
Answer:
A mole of horses would be Avogadro number of horses (a lot actually !). Avogadro number is 6.023 x 10(23). A mole of H (hydrogen) atoms contains 6.023 x 10(23) H atoms. A mole of H2 molecules contains 6.023 x 10(23) H2 molecules or 2 moles of H atoms (since each molecules has 2 atoms).
Explanation:
Answer:
A mole (mol) is the amount of a substance that contains 6.02 × 10 23 representative particles of that substance. The mole is the SI unit for amount of a substance. Just like the dozen and the gross, it is a name that stands for a number. There are therefore 6.02 × 10 23 water molecules in a mole of water molecules.
Explanation:
Which of the following is the correct word equation for the reaction described below?
Calcium hydroxide and hydrogen gas are produced by the reaction of calcium hydride and water.
calcium hydride + hydrogen → calcium hydroxide + water
calcium hydride + water → calcium hydroxide + hydrogen
calcium hydroxide + hydrogen → calcium hydride + water
calcium hydroxide + water → calcium hydride + hydrogen
Explanation:
calcium hydride + water → calcium hydroxide + hydrogen
hope it helps!
Answer:
B
Explanation:
got it right on edg
write a c++ program that prints the intial letter of any name
Answer:
please mark as brainliest!!
Explanation:
// C++ program to print initials of a name
#include <bits/stdc++.h>
using namespace std;
void printInitials(const string& name)
{
if (name.length() == 0)
return;
// Since touuper() returns int, we do typecasting
cout << (char)toupper(name[0]);
// Traverse rest of the string and print the
// characters after spaces.
for (int i = 1; i < name.length() - 1; i++)
if (name[i] == ' ')
cout << " " << (char)toupper(name[i + 1]);
}
// Driver code
int main()
{
string name = "prabhat kumar singh";
printInitials(name);
return 0;
}
Answer:
#include<iostream>
using namespace std;
int main(){
char str[20];
int i=0;
std::cout<<"Enter a name:" ;
cin>>str;
cout<<*str;
while(str[i]!='\0'){
if(str[i]==' '){
i++;
cin>>*(str+i);
}
i++;
}
return 0;
}
6 MARKER FOR CHEMISTRY I NEED THIS!!!
Answer:
when you put the marker in the water the water gets into the marker and it will change the solid color to a plain color witch means that the marker will make the water in the cup the color from the marker.
Hope I can help
A molecule contains 24.36 g of nitrogen and 62.64g of sliver
Answer:
This molecule is AgN3
Explanation:
Answer:
AgN3
Explanation:
Mass of nitrogen N is given as 24.36 g
Molar mass of nitrogen N= 14 g/mol.
amount of substance in mol of N = mass/molar mass
=24.36 g/ 14 g/mol.
=1.74 mol.
Given mass of silver= 62,64 g.
Molar mass of silver Ag=107.87 g/mol
Number of mols=62.64 g ÷ 107.87 g/mol.
=0.58 mol.
Ratio of number of mol of N and number of mols of Ag = 1.74 mol / 0.58 mol
=3:1
Hence, empirical formula is AgN₃.
23. Soluble salts can be prepared using
the following methods except by
A. action of dilute acids on
metals.
B. action of dilute acid on an
insoluble base.
C. direct combination of
constituent elements.
D. neutralization reactions.
E. precipitation from solutions,
help ple*zzzz*zzz*
Answer:
I think crystallization is a write answer for this question
Explanation:
but according to this (E is the write answer)
Which sequence represents the relationship between temperature and volume as explained by the kinetic-molecular theory?
higher temperature, more kinetic energy, more space between particles, higher volume
higher temperature, less kinetic energy, less space between particles, higher volume
higher temperature, more kinetic energy, less space between particles, lower volume
higher temperature, less kinetic energy, more space between particles, lower volume
Answer:
higher temperature, more kinetic energy, more space between particles, higher volume
This is true because increase in temperature kinetic energy increase so molecules move apart and increase volume
Explanation:
What is the atomic number of this element?
Answer:
27
Explanation:
Multiple choice-- 16 pts!
Two moles of aluminum chloride are dissolved in two liters of water.
How does the vapor pressure of the water change?
It increases because aluminum and chloride ions displace water molecules, which escape into the gas phase.
It first decreases as aluminum chloride attracts the water molecules, but it then increases as dissolving completes and starts to push water molecules out.
It decreases because nonvolatile aluminum and chloride ions now occupy some of the volume of the system.
Answer: It decreases because nonvolatile aluminum and chloride ions now occupy some of the volume of the system.
Explanation:
Vapor pressure of a liquid is defined as the pressure exerted by the vapors in equilibrium with the liquid/solution at a particular temperature.
So, when a non-volatile solute is added to a solvent then its molecules align at the surface of liquid. As a result, less number of solvent molecules will escape from the solution. Thus, there will be decrease in vapors and thus the vapor pressure decrease.
The relative lowering of vapor pressure is directly proportional to the amount of dissolved solute.
Why is elemental zinc considered a pure substance?
Select one:
It is a metal.
It is a mixture of different atoms.
All elements are considered pure substances.
It must be created in a lab.
Answer: C... Because Zinc is made of only one type of atoms.
Explanation: All elements are made of one type of atom. Pure gold is made out of only gold atoms, silver out of only silver atoms, etc.
Write the formula iron 11 bromide
Answer:
FeBr2
Explanation:
this isn't really an explanation but it's helpful so here, iron(II) bromide is an inorganic compound with the chemical formula FeBr₂. The anhydrous compound is a yellow or brownish-colored paramagnetic solid. Several hydrates of FeBr₂ are also known, all being pale colored solids.
define a warm front in your own words
Answer:
type of front formed when a warm air mass pushes a cold air mass, forcing the warm air to slide over the cold air.
___ ___ ___ ___ ___ P ___ ___ ___ ___ ___ ___ ___ mediums allow light to pass through
Answer:
I thought the answer was " T R A N S P A R E N T " but I don't know what the extra two letters are! I'm sorry, that's all I've got..
⚠️PLS HELP I HAVE ZERO CLUE AND NEED HELP ASAP DUE AT 12 WILL GOVE BRAINLIEST THANK U⚠️
1/4th of a sample of thorium-232 remains.
How long has the sample been decaying?
Answer:
Explain:i need this too ;-;
True or False. It is reasonable to assume that an atom with a positive oxidation number could make a chemical bond with an atom having negative oxidation number. And why?
A loss of negatively-charged electrons corresponds to an increase in oxidation number, while a gain of electrons corresponds to a decrease in oxidation number. Therefore, the element or ion that is oxidized undergoes an increase in oxidation number.
Hope this helped
How many atoms are present in 1.4 grams of aluminum?
Answer: 3.2x10^23
Explanation:
Start by finding the molar mass of aluminum.
Then turn grams into moles by dividing grams of substance by molar mass. 1.4g÷26.98g
Then multiply that by 6.022x10^23 atoms. 0.0519x6.022x10^23
You can use dimensional analysis to solve this type of problem.
Is a bell pepper a substance
How does Global warning affect the ocean
Answer:
The ocean absorbs most of the excess heat
Explanation:
Increasing ocean temperatures affect marine species and ecosystems. Rising temperatures cause coral bleaching and the loss of breeding grounds for marine fishes and mammals.
which example is a weak base?
ethyl alcohol, ammonia, potassium hydroxide or vinegar?
Answer:
potassium
Explanation:
b/c electronegativitu