A 65.0 g sample of copper at 97.6 °C is added to 46.1 g of water at 20 °C, reaching a final temperature of 24.9 °C.
What does the law of conservation of energy state?In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time.
Step 1: Calculate the heat lost by the sample of copper.A 65.0 g (m) sample of copper is cooled from 97.6 °C to 24.9 °C. Given that its specific heat (c) is 0.20 J/g.°C, we can calculate the heat (Q) lost using the following expression.
Q(Cu) = c(Cu) × m(Cu) × ΔT
Q(Cu) = (0.20 J/g.°C) × 65.0 °C × (24.9 °C - 97.6 °C) = -945 J
Step 2: Calculate the heat gained by the water (Qw).We will use the law of conservation of energy.
Qw + Q(Cu) = 0
Qw = -Q(Cu) = 945 J
Step 3: Calculate the mass of water.We will use the same expression as in Step 1.
Qw = c(w) × m(w) × ΔT
m(w) = Qw / c(w) × ΔT
m(w) = 945 J / (4.18 J&g.°C) × (24.9 °C - 20 °C) = 46.1 g
A 65.0 g sample of copper at 97.6 °C is added to 46.1 g of water at 20 °C, reaching a final temperature of 24.9 °C.
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Which item is experiencing a phase change?
A. Water boiling in a teakettle
B. Milk spilling from a cup
C. A sandwich being cut in half
D. An egg cooking on the stove
Can any one help me please
Answer:
a
Explanation:
An item which is experiencing a phase change is water boiling in a tea kettle.
What is a phase change?The conversion of matter from one state to another is called as phase change.The process is accompanied by a large amount of energy being evolved or absorbed during the process. It also depends on factors like temperature and pressure.
Each form of matter has it's own characteristic properties like specific heat, melting and boiling points . There are eight thermal processes through which matter undergoes phase change. They are as follows:1) freezing 2) melting 3)vaporization 4)condensation 5)sublimation 6)deposition 7)ionization 8) recombination.
These eight phases exist at different temperatures and pressures.The heat transfer process takes place in three ways which are conduction, convection and radiation.
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How is the kinetic energy of the particles that make up a substance different
after it changes state?
A. The kinetic energy is less after a substance changes from a liquid
to a gas.
OB. The kinetic energy is less after a substance changes from a gas to
a plasma
C. The kinetic energy is greater after a substance changes from a
liquid to a solid
D. The kinetic energy is greater after a substance changes from a
solid to a liquid.
Answer:
D. The kinetic energy is greater after a substance changes from a
solid to a liquid
Explanation:
During a phase change from solid to liquid, the particles making up the mobile becomes more mobile and as a result there is an increase in kinetic energy of the system.
Kinetic energy is the energy accrued due to the motion of a body. In a melting process where solids turn to liquid, there is an increase in kinetic energy. When randomness of a system increase, kinetic energy also increases. From liquid to gas and gas to plasma increases kinetic energy. In the other way round, the kinetic energy reduces.Answer:
D. The kinetic energy is greater after a substance changes from a solid to a liquid
Explanation:
A particle that gains electron is called a cation
true or false
TRUE. BECAUSE : When an atom gains electrons (which are negatively charge), the ion formed is negatively charged and is called an anion. If an atom loses electrons, the ion formed in positively charged and is called a cation.
What is the muddy water if the mud in muddy water eventually settles out?.
it will become a solution.hope this helps!
Amylase was shown to work best at a ph of 7 in comparison of a ph of 2. If the stomach juices have a ph of 2, what do we know about the function of salivary amylase within the stomach?.
The salivary amylase did not perform well if the pH becomes lower because it needs neutral pH for performing its functions.
Effect of pH on the enzymeWe can say that the salivary amylase did not perform their function very well within the stomach due to unfavourable environment such as lower pH. Due to lower pH, the enzyme structure is damaged so unable to perform its function so we can conclude that the salivary amylase did not perform well if the pH becomes lower.
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When two or more substances are physically combined the result is a:.
Answer:
I think it is called a Mixture
Explanation:
Sorry if it is wrong
How might microorganisms be spread?
Answer:
Asexual reproduction
Explanation:
for microorganism to reproduce and spread, the microorganism uses a process of cell division called mitosis, where the microorganism divides it self into two individual microorganism by mitosis using Asexual reproduction (an organism dividing itself into 2 individual organism not involving sexual activities, called Asexual reproduction). for these microorganisms to be able to reproduce Asexually that makes it much faster for these organisms to spread much more faster then mammals of other Sexually reproductive organisms.
PLEASE HELP ITS DUE TODAY
Which two statements below
are true? You can only pick two.
A mixture is made of substances that
can be easily physically separated from
each other.
The elements that make up a compound
are chemicaly bonded to each other and
therefore are NOT easily separated from
each other.
Both compounds and mixtures are easily
separated from each other because they
are elements or substances that are
only in physical contact with each other;
they are not chemically connected.
In a compound and a mixture, changing
the ratio of atoms or substances will
chemically change the compound and
mixture.
Answer:
2nd one and last one
Explanation:
im just that smart
I WILL MARK BRAINLYEST!
What are two things that the DDT and ozone story have in common?
there's no answer options I just need sentences please!
Answer:
DDT (dichloro-diphenyl-trichloroethane) was developed as the first of the modern synthetic insecticides in the 1940s. It was initially used with great effect to combat malaria, typhus, and the other insect-borne human diseases among both military and civilian populations.
Ozone is a naturally occurring molecule. An ozone molecule is made up of three oxygen atoms. It has the chemical formula O3.
Explanation:
It is commonly used as a fire extinguishing agent. The reason it has so much ozone depleting potential is because it contains bromine, which has many times the ozone depleting potential of chlorine.
How does benzene react with concentrated sulfuric acid?
Benzene reacts with concentrated sulfuric acid to form benzene sulfonic acid .
The reaction attached
Answer:
See below ~
Explanation:
The haber process can be used to produce ammonia (nh3) from hydrogen gas (h2) and nitrogen gas (n2). the balanced equation for this process is shown below. 3h2 n2 right arrow. 2nh3 the molar mass of nh3 is 17.03 g/mol. the molar mass of h2 is 2.0158 g/mol. in a particular reaction, 0.575 g of nh3 forms. what is the mass, in grams, of h2 that must have reacted, to the correct number of significant figures? 0.1 grams 0.102 grams 0.10209 grams 0.1021 grams
The mass of hydrogen reacted with nitrogen to give ammonia is 0.1 grams.
How we calculate the mass from moles?
Mass of any substance will be calculated by using the moles as:
n = W/M, where
W = required mass
M = molar mass
Given chemical reaction is:
3H₂ + N₂ → 2NH₃
Moles of 0.575 g of NH₃ will be calculated as:
n = 0.575g / 17.03g/mol = 0.033 moles
From the stoichiometry of the reaction, it is clear that:
2 moles of NH₃ = produced by 3 moles of H₂
0.033 moles of NH₃ = produced by 3/2×0.033=0.0495 moles of H₂
Now we calculate the mass of hydrogen from the given moles and molar mass as:
W = (0.0495mol)(2.0158g/mol) = 0.09 grams = 0.10 grams
Hence, option (a) is correct i.e. 0.1 grams.
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Which natural polymers are involved with making clothing?
A. wool, silkworm cocoon, and cellulose
B. wool, nylon, and DNA
C. starch, nylon, and DNA
D. starch, silkworm cocoon, and cellulose
Answer:
The answer is A!!!
Explanation:
just took the quiz on edge:)
Answer:
The answer that you are looking for is A.) wool, silkworm cocoon, and cellulose
Explanation:
I got it right on edge 2020. 100%
60 points! please help me i will appreciate it!
4. Which type of fault does NOT cause
earthquakes?
A normal
B parallel
C reverse
D strike-slip
Answer:
Earthquakes occur on faults - strike-slip earthquakes occur on strike-slip faults, normal earthquakes occur on normal faults, and thrust earthquakes occur on thrust or reverse faults. I hope this helps you :)
Jude has a 30.00 L cylinder full of acetylene gas that he will use for welding in his workshop. If the pressure of the cylinder is 1720 kPa and the workshop is at 20.0 °C, then how many moles of acetylene are in the tank? (Show work)
Answer:
About 21.2 moles.
Explanation:
Recall the ideal gas law:
[tex]\displaystyle PV = nRT[/tex]
Where P is the pressure of the gas; V is its volume; n is the number of moles of gas; R is the universal gas constant; and T is the absolute temperature.
Rearrange to solve for n:
[tex]\displaystyle n = \frac{PV}{RT}[/tex]
Because R has units of L-atm/mol-K, convert the pressure to atm:
[tex]\displaystyle 1720 \text{ kPa} \cdot \frac{1\text{ atm}}{101.3\text{ kPa}} = 17.0\text{ atm}[/tex]
And convert from Celsius to kelvins:
[tex]\displaystyle \begin{aligned}T _ k & = T_C + 273.15 \\ \\ & = (20.0) + 273.15 \\ \\ & = 293.2\text{ K} \end{aligned}[/tex]
Hence substitute and evaluate:
[tex]\displaystyle \begin{aligned} n & = \frac{PV}{RT} \\ \\ & = \frac{\left(17.0\text{ atm})(30.00\text{ L})}{\left(\dfrac{0.08206\text{ L-atm}}{\text{mol-K}}\right)(293.2\text{ K})} \\ \\ & = 21.2\text{ mol } \end{aligned}[/tex]
In conclusion, there are about 21.2 moles of acetylene in the tank.
what is the positive ion in aluminum and oxygen
Answer:
Three Oxygen atoms gains two electrons each ( total of six) from two Al atoms, each Al atom loses three electrons (total of six) to three oxygen atom , in this process each Al atom becomes Al3+ ion and Oxygen atom after gaining two electrons becomes O2− ion
Explanation:
Three Oxygen atoms gains two electrons each ( total of six) from two Al atoms, each Al atom loses three electrons (total of six) to three oxygen atom , in this process each Al atom becomes Al3+ ion and Oxygen atom after gaining two electrons becomes O2− ion
When 2 small figures are pulling in the opposite direction, their
individual forces
Answer:
To determine if the forces acting upon an object are balanced or unbalanced, an analysis must first be conducted to determine what forces are acting upon the object and in what direction. If two individual forces are of equal magnitude and opposite direction, then the forces are said to be balanced
Explanation:
How does the difference in the mass of the ball affects the changes in the distance of the object
Answer:
In very simple words ,
As the weight increases the gravitational force acting on the ball increases and thus it effects the change in the distance of the ball as the ball will fall very close to its initial distance if it has more mass and shall go far if the mass is less .
The relative atomic mass of copper is 63.5. Explain why this value is not a whole number
This answer is not a whole number due to the fact that it is a decimal form.
A whole number would be 635, it would not be 63.5. Therefore this number is not whole.
Match these note cards and tell me with ones go to gives off carbon dioxide and does not give off carbon dioxide
Which are indicators that a chemical change has occurred? Check all that apply. change in odor change in shape change in energy change in color change in size o formation of a precipitate
Color change, formation of a precipitate, formation of a gas, odor change, temperature change is the correct answer
What is Chemical Indicator ?
Chemical indicators are substances that change color in response to changes in a chemical environment, such as changes in pH, temperature, or the presence of certain ions. They are commonly used in a variety of applications, such as quality control in manufacturing, medical diagnostics, and laboratory research. There are many different types of chemical indicators, including pH indicators, which change color in response to changes in the acidity or alkalinity of a solution, and redox indicators, which change color in response to changes in the oxidation state of a substance.
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Answer:
they're all right
Explanation:
on edge
How many moles of Al2O3 [Aluminum oxide] is in 40g sample
Answer:
0.39 is the answer!
What is the density of aluminum chloride vapor (AlCl3) at 498 K and 0.939 atm?
1.24 g/L
3.06 g/L
5.17 g/L
7.42 g/L
Answer:
3.06 g/L
Explanation:
Taking into account the definition of density and ideal gas law, the density of aluminum chloride vapor (AlCl₃) at 498 K and 0.939 atm is 3.06 g/L.
DensityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
Ideal gas lawIdeal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of gases:
P×V = n×R×T
Density of aluminum chloride vaporFrom the Ideal gas law, you can get that:
[tex]\frac{n}{V} =\frac{P}{RxT}[/tex]
On the other side, the molar mass of substance is a property defined as the amount of mass that a substance contains in one mole. It can be expressed as:
[tex]molar mass= \frac{mass}{number of moles}[/tex]
Then, the number of moles n can be calculated as:
[tex]n=\frac{mass}{molar mass}[/tex]
So:
[tex]\frac{\frac{mass}{molar mass} }{V} =\frac{P}{RxT}[/tex]
Solving you get the expression:
[tex]\frac{mass }{V} =\frac{Pxmolar mass}{RxT}[/tex]
Considering the definition of density, you finally get:
[tex]density=\frac{Pxmolar mass}{RxT}[/tex]
In this case, you know:
P= 0.939 atmmolar mass of AlCl₃= 133.35 [tex]\frac{g}{mol}[/tex]R= 0.082[tex]\frac{atm L}{molK}[/tex]T= 498 KReplacing in the previous expression for the calculation of the density:
[tex]density=\frac{0.939 atmx133.35\frac{g}{mol} }{0.082\frac{atm L}{molK} x498 K}[/tex]
and solving you get:
density= 3.06 g/L
Finally, the density of aluminum chloride vapor (AlCl₃) at 498 K and 0.939 atm is 3.06 g/L.
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density:
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I need help with an science IXl i need to go up to 8- its about comparing cells and cell parts somebody please save me!
Answer:
o cany give because of i am in 9th
Chemical reactions spontaneously occur when the free energy of the products is ___________ the free energy of the reactants.
Answer:
lower
Explanation:
For a spontaneous process, the standard Gibbs free energy change has to be less than zero:
∆G° < 0 → spontaneous
∆G° > 0 → non- spontaneous
∆G° = 0 → system is at equilibrium
For a negative change in standard Gibbs free energy, the Gibbs free energy of the products has to be lower than that of the reactants since Gibbs free energy change is the standard Gibbs free energy of products minus that of the reactants.
[tex]\boxed{∆G= G°(products) -G°(reactants)}[/tex]
Mathematical derivation:
G°(products) -G°(reactants) < 0
G°(products) < G° (reactants)
✩ Note that in the image attached, the Gibbs free energy change is usually denoted by a single-headed arrow, from reactants to products.
What is free energy?
the amount of energy available to do useful workit tells us the spontaneity of a chemical processStandard state conditions
You may have noticed the superscript ° after the letter G (which stands for Gibbs free energy), and this symbol denotes standard state.implies that the pressure of a gas is 1 atmimplies that for a solute, its concentration is 1MSpontaneity
the ability of a reaction to occur without outside interventionFor example, an ice melting in a cup of hot tea is a spontaneous process (i.e. the transfer of heat from a hotter object to a cooler object is spontaneous).why the cat sits on a stove above the stove
Answer:
Explanation:
if you are wondering how you say that, you say "why the cat sits on the stove" but if it's a random question that has no sense to it my answer to you would be the cat needs some love and heat, the stove is the hottest thing it has right now. Give it some love!
Milk, if 2.00 liters has a mass of 2.06 kg. Find the density in g/cm^3
Answer:
The answer is 1.03 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
1 kg = 1000 g
2.06 kg = 2060 g
1 L = 1000 cm³
2 L = 2000 cm³
mass = 2060 g
volume = 2000 cm³
We have
[tex]density = \frac{2060}{2000} = \frac{103}{100} \\ [/tex]
We have the final answer as
1.03 g/cm³Hope this helps you
Answer:
The density of milk is 1.03 g/cm³.
Explanation:
Given data:
Volume of milk = 2.00 L
Mass of milk = 2.06 kg
Density of milk = ?
Solution:
We know that density is equal to the mass divided by volume.
we will convert the unit first because we require the density in g/cm³.
2.06 kg ×1000 g/ 1 kg = 2060 g
2.00 L × 1000 mL / 1L = 2000 mL
d = m/v
d = 2060 g/2000 mL
d = 1.03 g/mL
mL = cm³
d = 1.03 g/cm³
Thus, density of milk is 1.03 g/cm³.
The Steller sea lion population has been decreasing in parts of Alaska. New evidence suggests that Steller sea lions need herring as a part of their diet in order to survive. Pollock, another type of fish, also feed on herring. Which would most likely help the Steller sea lion population to increase?
Answer:
Improving the habitats of herring thereby increasing their population.
Explanation:
First, two consumers (Steller sea lion and Pollock) are both competing for common prey (herring). Since the question only asked what could be done to increase the decreasing Steller sea lion population of Alaska, the focus would be made only on the Steller sea lion.
The Steller sea lion population would increase if:
1. The herring population should be increased by improving the food available for them to feed on, and improving their reproduction capacities to enable them to reproduce efficiently.
2. Since there are 2 predators. If the population of the prey is fixed, then Pollock should be more hunted by farmers or other biological means to eliminate competition.
Does the size of the rock affect how fast a rock can be weathered?
Answer:
Most chemical weathering takes place only on the outer surface of a rock. Therefore, rocks with a lot of surface area weather faster than rocks with little surface area. However, if a rock has a large volume as well as a large surface area, it takes longer for the rock to wear down.
Explanation:
When can a metal replace another metal in a single displacement reaction?
Only if the metal replacing it is isoelectronic with the metal that is being replaced.
When it is larger in atomic mass.
Any element can always replace another element.
When it is more reactive according to the reactivity series.
Answer:
When it is more reactive according to the reactivity series.
Explanation: