Answers
Answer:
2nd option
Explanation:
Related Questions
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How many formula units are in a sample of salt, NaCl, with a mass of 87.75 grams?
Answers
Answer:
Number of Nacl units in mass of [tex]87.75[/tex] grams [tex]= 1.50[/tex]
Explanation:
Mass of one unit of NaCl or one atom of NaCl is [tex]58.44[/tex] g/mol
The total mass of the NaCl is [tex]87.75[/tex] grams.
The number of unit in [tex]87.75[/tex] grams of NaCl is equal to [tex]87.75[/tex] grams divided by mass of one unit of NaCl i.e [tex]58.44[/tex] g/mol
This can be mathematically be presented as
[tex]\frac{87.75}{58.44} \\[/tex] Units
[tex]1.50[/tex] Units
Number of Nacl units in mass of [tex]87.75[/tex] grams [tex]= 1.50[/tex]
Calculate the concentration, in moles per litre, of a solution formed when 13.0 g of calcium hydroxide is dissolved in 5.0 L. Please show work!
Answers
Answer: The concentration, in moles per litre, of a solution formed when 13.0 g of calcium hydroxide is dissolved in 5.0 L is 0.036 M
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n}{V_s}[/tex]
where,
n = moles of solute
[tex]V_s[/tex] = volume of solution in L
moles of [tex]Ca(OH)_2[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{13.0g}{74g/mol}=0.18mol[/tex]
Now put all the given values in the formula of molality, we get
[tex]Molarity=\frac{0.18}{5.0L}=0.036M[/tex]
Therefore, the concentration, in moles per litre, of a solution formed when 13.0 g of calcium hydroxide is dissolved in 5.0 L is 0.036 M
Arc AB is One-sixth of the circumference of a circle. What is the radian measure of the central angle?
A.)StartFraction pi over 6 EndFraction
B.)StartFraction pi Over 3 EndFraction
C.)StartFraction 2 pi Over 3 EndFraction
D.)StartFraction 5 pi Over 6 EndFraction
THE ANSWER IS B!!!
Answers
Answer:
?
Explanation:
A dipole consists of a positive charge and a negative charge. To
determine the electric potential at a position between the two charges
in an electric field created by a dipole, calculate the electric potential
generated by.
Answers
Answer:
k
Explanation:
Someone can help me whit this? I have the whole document too.
Answers
Answer:
1a. Metalloids have properties that are between metals and non-metals, they are alo known as semi-metals.
b.) The yellow border consisting of silicon, boron, Ge As, etc., are metalloid elements
2a.) Non-metals are on the right side of the periodic table.
B.) Non-metals have poor conductivity, are not malleable or ductile, are not sonorous. They are basically the opposite of metals.
what tool do you have to use to find exactly 15.7 milliliters of vinegar? A beaker B balance C meter stick D thermometer E stopwatch F graduated cylinder
Answers
Answer:
A Graduated Cylinder would be you answer because they have markings for smaller measurnments like milliliters
Explanation:
The Moon and stars seem to move from _____________________________ to __________________________________ across the night sky.
Answers
they seem to move from east to west
ˢᵒʳʳʸ ᶦᶠ ᶦᵗˢ ʷʳᵒⁿᵍ
11. What is the mass number
of an element if its atom
contains 10 protons, 10
electron, and 12 neutrons?
A 12
C20
D. 32
Answers
Answer:The mass numbr is 22
Explanation:
Mass number=number of protons+ number of neutrons....which is 10+12=22
Suppose you need to heat food. What wave type from the electromagnetic spectrum could you use?
Answers
Answer:
Microwave radiation
Explanation:
This radiation is the one used in microwaves.
Answer:
Infrared
Explanation:
Infrared light is used by electrical heaters, cookers for cooking food, and by infrared cameras which detect people in the dark. Infrared light has frequencies which are absorbed by some chemical bonds. The internal energy of the bonds increases when they absorb infrared light, which causes heating.
Grains of sugar dissolve more quickly in tea than do sugar cubes. Which answer correctly describes why this occurs?
The sugar grains form a saturated solution.
The sugar cube is already at equilibrium.
The sugar grains have a greater surface area.
The sugar cube is at great pressure.
Answers
Answer:
sugar cube is at great pressure
Explanation:
this is because great pressure means its more solid
5.77 g of nitrogen react with excess hydrogen producing 6.83 g of ammonia what is the percent yield. Determine/Label the actual yield, theoretical yield, and the percent yield for the reaction. N2+3H2=2NH3
Answers
Answer:
Percentage yield is 41.21%
Explanation:
Equation of reaction,
N₂ + 3H₂ → 2NH₃
Actual NH3 = 6.83g
Mass of N2 = 5.77g
Theoretical yield = ?
5.77g of N2 = 6.83g of NH3
14g of N2 = xg
X = (14 × 6.83) / 5.77
X = 95.62 / 5.77
X = 16.57g of NH3
Theoretical yield of NH3 is 16.57g
Percentage yield = (actual yield / theoretical yield) × 100
% yield = (6.83 / 16.57) × 100
% yield = 0.4121 × 100
% yield = 41.21%
The percentage yield of NH3 is 41.21%
Which describes the pH of an antacid that is used to neutralize stomach acid?
Answers
Answer:
calcium carbonate, is 9.91
Explanation:
Answer:
B or The antacid is basic and will neutralize the acid entering the esophagus.
Explanation:
What kind of bonds are hydrogen bonds?
Answers
Answer:
electromagnetic attraction between polar molecules in which hydrogen is bound to a larger atom, such as oxygen or nitrogen. I hope that was the answer u was looking for
Answer:
A hydrogen bond is the electromagnetic attraction between polar molecules in which hydrogen is bound to a larger atom, such as oxygen or nitrogen.
Explanation:
Why does burning fossil fuels put ecosystems under pressure?
Answers
Answer:
When fossil fuels are burned, carbon- dioxide and other greenhouse gases are released which trap the Sun's heat and can lead to global warming. The over heating of the atmosphere can put ecosystems under pressure especially the tundra regions.
Which hydrocarbon is saturated?
1. C2H2
2)C3H4
3)C4H6
4)C4H10
Answers
Answer: 4, c4h10
Explanation: source:
C4H10 is a saturated hydrocarbon.
What is a hydrocarbon?A hydrocarbon is an organic compound which consists of carbon (C) and hydrogen (H). For example, C4H10, C2H2 etc. There are four types of hydrocarbons namely alkanes, alkenes, alkynes and aromatic hydrocarbons.
What is a saturated hydrocarbon?A saturated hydrocarbon is that hydrocarbon in which the carbon atoms are linked only by single bonds. For eg: CH4, C2H6 etc. All alkanes are saturated hydrocarbons.
An unsaturated hydrocarbon is that hydrocarbon in which the carbon atoms are linked through double or triple bonds. For eg: C2H2, C3H4 etc. Alkenes and alkynes are unsaturated hydrocarbons.
C2H2, C3H4 and C4H10 are all unsaturated hydrocarbons. C4H10 is a saturated hydrocarbon as all the carbons are linked through single bonds.
Hence, D is the correct option.
To learn more about hydrocarbons here
https://brainly.com/question/17578846
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Where are most insect eggs laid on a corpse? *
A)On the head only.
B)Under the corpse.
C)Only on exposed skin
D)Body openings/wounds
Answers
Answer: usually D (but it could also be C)
Explanation:
How many neutrons does the isotope N-14 have? 6 7 8 9
Answers
Answer:
7
Explanation:
An isotope is an atom that has a different number of neutrons than the standard for that atom.
1)Nitogen -14 has 7 protons in the nucleus for its an isotope of nitrogen which has an atomic number of 7.
2)Now we need to find the number of neutrons. This is implied in the name of the isotope whereby the protons and neutrons add up to its atomic number. So
(14-7 protons= 7 neutrons.)
So it has 7 neutrons.
7
I just did it on edgen :)
Why do we not have solar and lunar eclipses every month?
Answers
Answer:
The moon's path around Earth is tilted compared to Earth's orbit around the sun. The moon can be behind Earth but still get hit by light from the sun. ... This is why we don't get a lunar eclipse every month.
Explanation:
Answer:
Explanation:
Because the sun only overlaps the moon once every 2-3 years
What is solubility?
- A solution in which no more solute will dissolve.
- The amount of solute it takes to make a supersaturated solution.
- The amount of solute that will dissolve in a given amount of solvent.
- The amount of solvent it takes to dissolve 100 g of solute.
Answers
Answer:
the correct answer is c
Explanation:
Copper and silver are two examples of atoms that will form a(n)
metallic bond
ionic bond
covalent bond
none of the above
Answers
Answer:
covalent bond is the answer
Answer:
covalent bond
That's your answer!!
What does hydropower rely on to create energy? A. heat from Earth's interior B. energy from the sun C. biomass D. flowing water
Answers
Answer:
D. flowing water
Explanation:
Due to flowing water, that helps create energy. It was used by farmers as far back as ancient Greece for mechanical tasks like grinding grain. Hydropower is also a renewable energy source and produces no air pollution or toxic byproducts
8 points
11. Humans have negatively impacted the environment for
years. Which
events represent ways humans have harmed the environment. (Choose all
that apply.)
burning fossil fuels
minning
planting trees
using solar power
using fertilizers
recycling
(There’s more than one answer btw)
Answers
Answer:
Burning Fossil Fuels
Mining
Using Fertilizers
Describe How do you make a metal object such as a nail into a magnet? What happens to make it magnetic?
Answers
Answer:
Stroking a magnet across it or high voltage
Explanation:
Stroking a magnet across it causes the alignment of the domain, making it magnetic temporarily. Also, high voltages from batteries can make it magnetic too, doing the same thing.
How does a catalyst increase the rate of a reaction?
A) It decreases the enthalpy change of the reaction.
B) It lowers the potential energy of the reactants.
C) It provides a lower activation energy for the reaction.
D) It raises the potential energy of the products.
Answers
Answer:
C) It provides a lower activation energy for the reaction is the correct answer.
Explanation:
A catalyst increases the rate of the chemical reaction by lowering the activation energy for a reaction.Catalyst is used to increase the reaction rate, it remains unchanged in the chemical reaction and it does not change the equilibrium constant.Activation energy is a minimum amount of energy required to initiate the reaction.How many moles of nitrogen gas (N2) are found?
Answers
Answer:
28.0134 moles
Explanation:
There are 28.0134 moles are found in nitrogen gas(N2).
Hope this helps!!! PLZ MARK BRAINLIEST!!!
13. Which activity causes the amount of carbon dioxide to increase in the
atmosphere?
fishing
picking up trash
machine use in factories
using hydroelectric power
Answers
Answer:
C.
Explanation:
Using machines in factories increases the amount of carbon dioxide in environment.
Which of these metals is least likely to be involved in chemical reactions?
A. iron
B. tin
C. gold
D. copper
Answers
Answer:
C gold
Explanation:
Coal is burned in the atmosphere to release energy. Which gas is needed for burning to take place?
Answers
Answer:
Oxygen gas is needed for burning to take place.
Explanation:
I don't say you have to mark my ans as brainliest but if it has really helped you plz don't forget to thank me...
The particle picture is best described as
a) a liquid compound
b) a liquid element
c) a solid element
d) a solid compound
e) a liquid mixture
Answers
A scientist has 0.12 miles of a gas at a pressure of 4.06 kPa and a volume of 14 liters in an enclosed container. What is the temperature of the gas in the container?
Answers
Answer:
56972.17K
Explanation:
P = 4.06kPa = 4.06×10³Pa
V = 14L
n = 0.12 moles
R = 8.314J/Mol.K
T = ?
We need ideal gas equation to solve this question
From ideal gas equation,
PV = nRT
P = pressure of the ideal gas
V = volume the gas occupies
n = number of moles
R = ideal gas constant
T = temperature of the gas
PV = nRT
T = PV / nR
T = (4.06×10³ × 14) / (0.12 × 8.314)
T = 56840 / 0.99768
T = 56972.17K
Note : we have a large number for temperature because we converted the value of pressure from kPa to Pa