A sample of magnesium weighs 64.65 grams. How
many moles are in this sample? (Show work)
Answer:
2.65939942411 ( Round if needed)
Explanation:
The reason it is this is because, one mole of magnesium weighs 24.31 grams. So if you know that, then you would do 64.65 grams divided by 24.31 grams to get you a final amount of 2.65939942411 moles.
0.10 moles of sodium sulfate is dissolved into 12 mL of solution. What is the molar concentration of the solution
Answer:
gg go next
Explanation:
The Flow of Energy in the Water Cycle
Energy flows through the Earth's system in the water cycle in two ways-when water
changes state and when water moves from place to place. When water changes state, I
water molecules absorb energy from or release energy to their surroundings. For
example, water can evaporate when it absorbs energy from sunlight or from surrounding
air, water, or land. When water condenses to form clouds, the water molecules release
energy to the surrounding atmosphere.
As water moves, it transfers energy from one location to another. For example, as
a warm surface current in the ocean flows to a colder polar region, thermal energy from
the equator is transported toward Earth's poles. When the warm water reaches areas
where the air is colder, some energy in the warmer water is released into the cooler air.
These energy transfers between the ocean and the atmosphere greatly influence Earth's
weather and climate.
current
27. Imagine snow on top of a mountain. What are some ways energy could be
transferred as the seasons change? Choose all answers that apply.
A. Energy flows into the snow from sunlight.
B. Cold snow melt flows into the warmer lake.
C. Warmer air absorbs energy from snow.
D. Energy flows into the snow from warmer air.
4Na + O2 2Na2O
How many moles of Na2O will be produced from 4.35 x 10^24 atoms of Na?
with explanation
At 1.05 atm and 11.15 °C, a 2.68 g sample of gas occupies a volume of 1830 mL. Calculate the molar mass of the gas.
Answer:
2.12g/mol
Explanation: quick maths
What is a benefit of the
development of the cell
theory?
A. Cells have made microscopes get
better.
B. There are less biologists today
C. There is more disease on Earth now.
D. Scientists now know much more
about cells and bacteria which is a
benefit to all humans
Answer:
D
Explanation:
D because scientists study cells to know how to help people when they are sick
hope this helps (it might be wrong)
Q
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51) Which statement BEST explains why Liquids and gases can flow but solids cannot?
A) Liquids and gases usually occupy a larger volume than the solid form of a substance.
B) The structure of liquids and gases is not fixed, so particles can slide past each other.
Solid particles are often larger than liquid and gas ones, so they can't move as easily.
D) Liquid and gas particles are more attracted to each other and "pull" the other particles.
Answer is:
The structure of liquids and gases is not fixed, so particles can slide past each other.
The sun provides the ____ to power the water cycle
A: Heat energy
B: Chemical energy
C: direction
the answer is a
it carries down heat rays which evaporates the water.
Describing Chemical Reactions
Quiz Active
1
2
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TIME REMAINING
57:48
Liquid 1 reacts with Liquid 2, producing a solid and a gas. Using this scenario, which supports the law of conservation
of mass?
EEEE
O mass of Liquid 1 + mass of solid = mass of Liquid 2 + mass of gas
O mass of Liquid 1 - mass of solid = mass of Liquid 2-mass of gas
O mass of Liquid 1 - mass of Liquid 2 = mass of solid + mass of gas
O mass of Liquid 1 + mass of Liquid 2 = mass of solid + mass of gas
Answer:
mass of Liquid 1 + mass of Liquid 2 = mass of solid + mass of gas
Explanation:
iquid 1 reacts with Liquid 2, producing a solid and a gas. Using this scenario, which supports the law of conservation
of mass?
EEEE
O mass of Liquid 1 + mass of solid = mass of Liquid 2 + mass of gas
O mass of Liquid 1 - mass of solid = mass of Liquid 2-mass of gas
O mass of Liquid 1 - mass of Liquid 2 = mass of solid + mass of gas
O
based on the law of the conservation of matter, the sum of the masses of the reactants must equal the sum of the masses of the products
so the correct answer is
mass of Liquid 1 + mass of Liquid 2 = mass of solid + mass of gas
An empty container with a volume of 140.0 cm3 is weighed and found to have a mass of 73.3 g. The container is filled with a liquid and reweighed. The mass of the container and the liquid is 192.1 g. What is the density of the liquid to the appropriate number of significant figures
Answer:
0.420 g/ml
Explanation:
Question
An empty container with a volume of 140.0 cm3 is weighed and found to have a mass of 73.3 g. The container is filled with a liquid and reweighed. The mass of the container and the liquid is 192.1 g. What is the density of the liquid to the appropriate number of figures
density = mass/volume
d = (192.1 -73.3)/140.0 = 58.8/140.0 =0.420 g/ml
An empty container with a volume of 140.0 cm3 is weighed and found to have a mass of 73.3 g. The container is filled with a liquid and reweighed. The mass of the container and the liquid is 192.1 g.0.420 g/ml is the density of the liquid.
What is density ?The term density is defined as the mass of a substance per unit volume. density expressed in grams per cubic centimeter. The formula of density is as follows:
Density = mass/ volume
The density of something is a measure of how heavy it is in relation to its size. When an object is denser than water, it sinks; when an object is less dense than water, it floats. Density is a property of a substance that is independent of the amount of substance.
Given:
Volume = 140.0 cm³
Density = ?
mass = 73.3 g, 192.1 g.
density = mass/volume
density = (192.1 -73.3) / 140.0
= 58.8/140.0
=0.420 g/ml
Thus, The mass of the container and the liquid is 192.1 g.0.420 g/ml is the density of the liquid.
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The boiling point of benzene is 80ºC. Which pair of samples will have the same average kinetic energy as benzene molecules?
· a sample of liquid benzene at 80ºC and a sample of gaseous benzene at 80ºC
· two samples of gaseous benzene, one at 80ºC and the other at 90ºC
· a sample of liquid benzene at 70ºC and a sample of gaseous benzene at 90ºC
· two samples of liquid benzene, one at 70ºC and the other at 80ºC
Answer: A. a sample of liquid benzene at 80ºC and a sample of gaseous benzene at 80ºC
Explanation:
A golfer uses a club to hit a golf ball that is sitting on a tee. The golf ball goes flying through the air. Which of the following statements describes the force or forces that transfer momentum between the club and ball? A. The club and the ball exert equal forces in the direction of the ball's motion. B. The club exerts a greater force on the ball than the ball exerts on the club C. The club exerts a forward force on the ball, and the ball exerts an equal backward force on the club D. The club exerts a forward force on the ball, but the ball does not exert a force on the club.
Suppose that 0.473 g of an unknown gas that occupies 200. mL at 1.81 atm and 25 8C was analyzed and found to contain 0.414 g of nitrogen and 0.0591 g of hydrogen. (a) What is the molecular for- mula of the compound
The molecular formula of the compound is N₂H₄
we'll begin by calculating the number of mole of the unknown gas. This can be obtained as follow:
Volume (V) = 200 mL = 200 / 1000 = 0.2 L
Pressure (P) = 1.81 atm
Temperature (T) = 25 °C = 25 + 273 = 298 K
Gas constant (R) = 0.0821 atm.L/Kmol
Number of mole (n) =?PV = nRT
1.81 × 0.2 = n × 0.0821 × 298
0.362 = n × 24.4658
Divide both side by 24.4658
[tex]n \: = \frac{0.362}{24.4658} [/tex]
n = 0.0148 moleNext, we shall determine the molar mass of the compound.mole of compound = 0.0148 mole
mass of compound = 0.473 g
molar mass of compound =?[tex]molar \: mass \: = \frac{mass}{mole} \\ \\ molar \: mass \: = \frac{0.473}{0.0148} \\ \\ [/tex]
Molar mass of compound = 31.96 g/molNext, we shall determine the empirical formula of the compound.Nitrogen (N) = 0.414 g
Hydrogen (H) = 0.0591 g
Empirical formula =?Divide by their molar mass
N = 0.414 / 14 = 0.0296
H = 0.0591 / 1 = 0.0591
Divide by the smallest
N = 0.0296 / 0.0296 = 1
H = 0.0591 / 0.0296 = 2
Therefore, the empirical formula of the compound is NH₂
Finally, we shall determine the molecular formula of the compound. This can be obtained as follow:Molar mass of compound = 31.96 g/mol
Empirical formula = NH₂
Molecular formula = ?Molecular formula = Empirical formula × n = Molar mass
[NH₂]n = 31.96
[14 + (2×1)]n = 31.96
16n = 31.96
Divide both side by 16
n = 31.96 / 16
n = 2
Molecular formula = [NH₂]n
Molecular formula = [NH₂]₂
Molecular formula = N₂H₄Thus, the molecular formula of the compound is N₂H₄
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define the term alotropy
Answer:
The term allotrope refers to one or more physical forms of a chemical element that occurs in the same physical state. Allotropes may show differences in chemical and physical properties. Swedish chemist Jons Jakob Berzelius proposed the concept of allotropy in 1841.
explanation
i searched it ;)
The charge on the iron ion in the salt Fe2O3 is....?
Answer = 0
Explanation:
The sum of the charges of atoms of elements in a neutral compound is zero
Hence the charge of iron in the compound is 0
The charge on the iron ion in the salt Fe₂O₃ is + 3 as the charge on overall compound is 0.
What are ions?An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.
Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.
The charge on the iron ion in the salt Fe₂O₃ is calculated as 2×x+3(-2)=0 thus x= +3.
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A student is testing a solid material to determine whether it is a pure substance or a
mixture. Which observation would MOST likely indicate that the material is a mixture?
The material has crystals of two different colors.
The material does not dissolve completely in water.
The material does not melt when it is heated over a burner.
The material reacts with an acid solution to form bubbles of gas.
Answer:
Explanation:
Es la segunda por qué un material sólido no se derrite en agua
Answer:
It is the second Explanation:
why a solid material does not melt in water
Can you please help me on these
Answer:
Surface weathering, I believe
Explanation:
can anyone heelp me plzzz
Answer: 1
Explanation: C= 1 if you round 1.04 to a single digit the answer is 1
PLEASEEE HELPPP MEEEEEEEEEEEE
g What is the minimum speed needed by a ground-state hydrogen atom for its kinetic energy to be enough to ionize the atom in a collision
Let u be velocity of hydrogen atom before collision and V the ve locity of two atoms moving together after collision By principal of conservation of momentum , we have
[tex]Mu + M \times 0 = 2VM[/tex]
[tex]V = \frac{u}{2} \\ [/tex]
The loss in kinetic energy Δϵ due to collision is
[tex]Δϵ= \frac{1}{2}Mu {}^{2} − \frac{1}{2} (2M)V {}^{2} \\ [/tex]
[tex]As, V = \frac{u}{2} \: we \: have \: Δϵ= \frac{1}{2}Mu {}^{2} − \frac{1}{2} (2M)( \frac{u}{2}) {}^{2} \\ [/tex]
[tex] = \frac{1}{2} Mu {}^{2} - \frac{1}{4}Mu { }^{2} = \frac{1}{4} Mu {}^{2} \\ [/tex]
Rest answer is in the pic
Use the reaction to answer the question.
C10H3 + 1202—?
Which products are expected from the reaction?
10C + 4H20 + 1002
10CO2 + 4H20
10CO2 + 8H20
10CO2 + 8H + 202
Answer:
The product expected is 10CO2 + 4H2O
A bike tire at a pressure of 2.4 atm and a
temperature of 290 K has a volume of 2.2 liters.
A child gets on the bike and rides it outside.
What is the new pressure if the temperature
outside is 296 K and his weight causes the tire's
volume to drop to 2.0 liters? please help!!!
Answer:
5.4 atm
Explanation:
P•V/T = P'•V'/T'
2.4•2.2/290 = P'•2/296
5.28/290 = P'/296 Multiply both sides by 296
1562.88/290 = P'
I'm = 5.4 atm
Calcula el número de gramos de soluto en 500 mL de 0.169 M KOH
Answer:
no se, no se y no se
Explanation:listo
When sulfur dioxide forms from two non-metals, a covalent bond results when the electrons are
Answer:
heres your answer
To determine whether a bond is Covalent or Ionic, you must know the difference in electronegativity (a fancy word for describing how good a job a particular element does at attracting new electrons).
Explanation:
When magnesium hydroxide reacts with nitric acid, it produces magnesium nitrate and water.
Mg(OH)2 + 2HNO3 → Mg(NO3)2 + 2H2O
In one to two sentences, explain how this reaction demonstrates that matter is neither created nor destroyed in a chemical reaction.
Answer:
The law of conservation of mass states that mass is neither created nor destroyed but the mass of the system must remain constant over time. The total number of atoms in the reactants is equal to the total number of atoms in the product. Therefore, this chemical equation shows that energy is conserved and demonstrates the law of conservation of mass.
The given chemical equation, the total number of the magnesium, hydrogen, oxygen and nitrogen in the reactant is same in the product too.
Law of conservation of mass:
Mass is neither created nor destroyed but the mass of the system is always remain constant in the reaction.
The total number of atoms in the reactants must be equal to the total number of atoms in the product of a reaction.
For example-
[tex]\bold {Mg(OH)_2 + 2HNO_3 \rightarrow Mg(NO_3)_2 + 2H_2O}[/tex]
The total number of the magnesium, hydrogen, oxygen, and nitrogen in the reactant is same in the product too.
Therefore, the given chemical equation, the total number of the magnesium, hydrogen, oxygen and nitrogen in the reactant is same in the product too.
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pls help me i really need the answer see it and do it
Answer:
Diffusion
Explanation:
What happens as a liquid freezes?
O A. The average kinetic energy decreases.
OB. The average kinetic energy increases.
O C. Heat energy is absorbed.
O D. Heat energy is released.
Answer:
The average kinetic energy decreases.
Most of the energy that humans use on Earth originally came from
Question 20 options:
The moon
The Sun
The Ocean
Volcanic activity
An alkene with the molecular formula C10H18 is treated with ozone and then with zinc and acetic acid. The only product isolated from these reactions is:
The only product obtained from the ozonolysis of C10H18 with ozone and then with zinc and acetic acid is shown in the image attached.
The ozonolysis of alkenes is a reaction between an alkene and ozone which cleaves the alkene bond. The reaction proceeds through a molozonide and an ozonide intermediate which is highly unstable.
After the reaction of the alkene and ozone, zinc metal and acetic acid are used to reduce the ozonide to yield the product(s). The single product obtained by the ozonolysis of C10H18 is shown in the image attached.
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What is the pH of a solution with [OH-] = 1 x 10-4 M?
because we are given the concentration of the hydroxide ion(OH⁻), we will first find the the concentration of [H⁺] ions and find the pH from there.
Finding the concentration of H⁺ ions:
we know the relation:
[OH⁻]*[H⁺] = 10⁻¹⁴ [square brackets denote the concentration]
(10⁻⁴)[H⁺] = 10⁻¹⁴
[H⁺] = 10⁻¹⁰ [multiplying both sides by 10⁴]
Finding the pH:
pH = -log[H⁺]
pH = -log(10⁻¹⁰)
pH = 10
Answer:
given:
abcissa(x-coordinate) of given point: -6
let's say the ordinate(y-coordinate) of the given point is y
distance of the given point from (1,3) = √74
we can rewrite the given information as:
the distance between the points (-6,y) and (1,3) is √74
finding y:
we know that in order to find the distance between any two points, we use the distance formula, which goes as
