✅Show work regardless if student got answer correct or incorrect
q = mC∆T
q = (30.0g)(0.900J/goC)(50oC)
q = 1350 J
So, the right answer is 1350 J
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A rock has a mass of 211 grams and occupies a volume of 72 centimeters cubed what is it density?
Answer:
Density = 2.9 g/cm³Explanation:
The density of a substance is given by
[tex]Density(\rho) = \frac{mass}{volume} [/tex]From the question
The mass of the stone is 211 g
It's volume is 72 cm³
Substitute the values into the above formula and solve for the density
That's
[tex]Density(\rho) = \frac{211}{72} [/tex]Density = 2.930
We have the final answer as
Density = 2.9 g/cm³Hope this helps you
describe the energy inputs and outputs for the campfire. Use the law of conservation of energy to construct a valid qualitative equation that includes all the input and output energies involved.
Answer:
The essence including its particular subject is outlined in the following portion mostly on clarification.
Explanation:
The energy throughout the campfire comes from either the wood's latent chemical energy until it has been burned to steam up and launch up across the campfire. The electricity generation for something like a campfire seems to be in the context including its potential chemical energy which is contained throughout the firewood used only to inflame the situation.The energy output seems to be in the different types of heat energy radiating across the campfire, laser light generated off by the blaze, and perhaps a little number of electrical waves, registered throughout the firewood cracking whilst they combust throughout the blaze.and,
chemical energy ⇒ heat energy + light energy + sound energy
6. Many changes have been made to atomic theory since Daltons time.
A. List the key difference between modern atomic theory and dalton's atomic
theory
B. What important aspect of scientific theories is illustrated by these differences
Answer:
A. Modern atomic theory is, of course, a little more involved than Dalton's theory but the essence of Dalton's theory remains valid. ... Also, there are different kinds of atoms (differing by their masses) within an element that are known as "isotopes", but isotopes of an element have the same chemical properties.
B. The explanation becomes a scientific theory. In everyday language a theory means a hunch or speculation. Not so in science. In science, the word theory refers to a comprehensive explanation of an important feature of nature supported by facts gathered over time.
Read the following statement.
Changes must occur at a structural level in order to be considered chemical.
Which detail from the article provides the BEST example to support this statement?
A
For instance, a block of wood may feel rough when you run your finger across it but rubbing the wood with sandpaper smooths the surface so it no longer feels rough.
B
A piece of metal may be heated in a fire until it glows, but the metal is the same material before heating and after cooling.
C
Think about ice melting into water, and then water being heated up and turning into steam.
D
The creation of a new, solid substance from two liquid substances indicates that a reaction has taken place and altered the original substances.
Answer:
D
Explanation:
A new substance must form in a chemical change. structure, properties and composition must change in a chemical change.
The creation of a new, solid substance from two liquid substances indicates that a reaction has taken place and altered the original substances.
What is reaction?Reaction is defined as a process in which one or more substances are also called as reactant, are convert to one or more different substance known as product.
There are basically five types of reaction
Combustion reactionDecomposition reactionNeutralization reactionPrecipitation reactionSynthesis reactionA new reaction must have chemical change as well as physical change such as structure, properties and composition.
Thus, the creation of a new, solid substance from two liquid substances indicates that a reaction has taken place and altered the original substances.
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13. The idea that all matter consists of tiny particles in constant motion is an example of a (n)
Answer:
An example is the kinetic theory of matter.
According to this theory, all matter consists of tiny particles that are in constant motion.
Particles move at different speeds in matter in different states.
A graduated cylinder has 3.5 liters of oil. How many milliliters of oil is available in the graduated cylinder? O 3.5 mL O 3500 mL O 35 mL 350 mL
Answer:
3500 Ml
Explanation:
1 liter is equal to 1000 milliliters
3.5 liters is equal to 3500 milliliter
Express the number 0.000746 in scientific notation.
A) 746 x 10-6
B) 7.46 x 102
C) 7.46 x 104
D) 7.46 x 104
E) 0.746 x 10-3
Answer: 7.46 x 10-4
Explanation:You move the decimal place 4 times. For any scientific notation question in the future, look at the answer choices and beside the answer choices work it out. By working it out just take the rounded number (which in this case is 7.46) and go to the decimal and move it however many times it states in the 10 (10-4, move 4).
A student is given a mixture of NaCl(s) and NaNO3(s) and is tasked with determining the percent of NaCl in the mixture. The student dissolves 3.613 g of the mixture in 50 mL of DI water. The student then adds excess AgNO3(aq) to precipitate the chloride ion as AgCl(s). The student determines that 2.268 g of AgCl is formed.
Answer:
25.60% of NaCl in the mixture
Explanation:
With the amount of AgCl produced we can now the moles of Cl⁻ = Moles of NaCl. With these moles we can now the mass of NaCl and, as total mass was 3.613g, it is possible to determine mass percent of NaCl in the mixture.
Moles NaCl:
2.268g AgCl * (1mol / 143.32g AgCl) = 0.01582 moles AgCl
Molar mass AgCl 143.32g/mol
0.01582 moles AgCl = Moles Cl⁻ = Moles NaCl
Mass NaCl (Molar mass: 58.44g/mol):
0.01582 moles NaCl * (58.44g / mol) = 0.9248g NaCl in the mixture
Mass percent:
(0.9248g NaCl / 3.613g) * 100 =
25.60% of NaCl in the mixture7) All of the following are
external factors of the
photosynthesis EXCEPT*
O A. Light intensity
O B .Temperature
O c. Chlorophyll content
O D .Oxygen
Answer:
D. Oxygen
Explanation:
External factors of photosynthesis
Light intensityTemperatureChlorophyll contentCarbon dioxideImmediate product
GlucoseByproduct
OxygenHope this helps ;) ❤❤❤
What are the names of the varibles that a scientist uses when performing a scientif investigation
experiment)?
Answer:
Manipulated (independent) Variable and Responding (Dependent) Variable
Explain why flourine forms a negative ion more easily than chlorine.
Answer:
the electron is outermost
Explanation:
shell of a flourine are closer together .
Answer:
The electron gain enthalpy of chlorine is more negative than fluorine. This is because fluorine is smaller in size than chlorine. Thus the extent of electron-electron repulsion would be more in fluorine than in chlorine. Because of this, the incoming electron would face more repulsion in fluorine than in chlorine.
Explanation:
help!! what does area measure
Answer:
34
Explanation:
hello :) how to do this?
Answer:
28g/ dm³
0.5 M
Explanation:
1dm³= 1000cm³
Let's convert the volume to cm³.
Volume of solution
= 200cm³
= (200÷1000) dm³
= 0.2 dm³
Concentration in g/dm³ means the amount of solute, KOH, in 1 dm³ of solution.
In 0.2 dm³, there is 5.6g of KOH.
Thus in 1 dm³, amount of KOH
= 5.6 ÷0.2
= 28g
Concentration in g/dm³ is 28g/dm³.
Molarity is a concentration unit. It is the number of moles of solvent in 1 L or 1dm³ of solution. Since we have already found the mass of KOH in 1dm³ of solution, we will use dm³.
1dm³ ----- 28g of KOH
moles= mass ÷mr
Molecular mass of KOH
= 39 +16 +1
= 56
1dm³ ----- 28 ÷56= 0.5 moles of KOH
Thus, concentration in molarity is 0.5M.
(Unit for molarity is M)
X
Which process is a chemical change?
A burning a match
B. boiling water
OC melting ice
OD. breaking glass
Which of the following substances is more likely to dissolve in water? Which of the following substances is more likely to dissolve in water? HOCH2CH2OH O || CH3(CH2)9CH CCl4 CHCl3 CH3(CH2)8CH2OH
Answer:
HOCH₂CH₂OH
Explanation:
You generally assume that polar dissolves polar and nonpolar dissolves nonpolar. Since water is polar, we are looking for a polar molecular.
This cancels out CH₃(CH₂)₉CH and CCl₄.
You are left with CHCl₃, CH₃(CH₂)₈CH₂OH, and HOCH₂CH₂OH. You would pick the third option since it is the most polar.
The compound HOCH2CH2OH having two O - H groups is more likely to interact with water.
A substance is soluble in water if it is capable of interacting in an electrostatic interaction. Water can form hydrogen bonds with other molecules that posses polar O - H bonds.
Hence, looking at the options provided in the question, we will observe that the compound HOCH2CH2OH having two O - H groups is more likely to interact with water.
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What period is the atom in?
1.
What group is the atom in?
What is the name of this atom?
What other atom would have similar
properties to the atom?
Will this atom conduct electricity well?
Answer:
Put these atoms in order from most negative overall charge to least negative
overall charge.
11 Atom X: 104 protons, 102 electrons
11 Atom B: 24 protons, 18 electrons
1 Atom Q: 15 protons, 16 electrons
11. Atom P: 7 protons, 10 electrons
Explanation:
What period is the atom in?
1.
What group is the atom in?
What is the name of this atom?
What other atom would have similar
properties to the atom?
Will this atom conduct electricity well
what mass of silver has a volume of 105.0 cm^3? The density of silver is 10.50 g/cm^3
Answer:
mass = 1102.50 gExplanation:
The density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]
Making mass the subject we have
mass = Density × volumeFrom the question
Density of silver = 10.50 g/cm³
Volume = 105 cm³
Substitute the values into the above formula and solve for the mass
That's
mass = 10.5 × 105
We have the final answer as
mass = 1102.50 g
Hope this helps you
An experiment looking at structures smaller than a cell would most likely employ a
a. dissecting microscope
b. transmission electron microscope
c. scanning electron microscope
d. compound light microscope
Answer:
In a conventional optical microscope, objects less than about 200 nanometers apart cannot be distinguished from one another. ... Although electron microscopes produce a detailed image of very small structures, they cannot provide an image of the proteins that make up those structures.
Answer:
b. transmission electron microscope
Explanation:
Solve for a. a(b + c)=d
a = d/(b + c)
Explanation:a(b + c) = d
a = d/(b + c)
Answer:
[tex]\huge \boxed{a= \frac{d}{b+c} }[/tex]
[tex]\rule[225]{225}{2}[/tex]
Explanation:
[tex]a(b+c)=d[/tex]
Dividing both sides by (b + c).
[tex]\displaystyle a= \frac{d}{(b+c)}[/tex]
[tex]\rule[225]{225}{2}[/tex]
3. A wave has a wavelength of 10 m and a speed of 340 m/s. What is the frequency of the
wave?
Answer:
We have the wavelength which is 10,speed/velocity=340 and frequency=?.
The formula is velocity=frequency × wavelength.
340=f × 10.
340=10f.
frequency=34hertz.
Answer:
34hertz
Explanation:
We have the wavelength which is 10,speed/velocity=340 and frequency=?.
The formula is velocity=frequency × wavelength.
340=f × 10.
340=10f.
frequency=34hertz.
what energy is released when we burn natural gas
Answer:
Heat Energy... I am pretty sure?
Explanation:
There is a law called conservation of energy which states that energy can neither be created nor be destroyed. It can be only transferred from one form to another form. Therefore, heat energy is released when we burn natural gas.
What is energy transfer in thermodynamics?Energy transfer is a phenomenon in which energy transfer from one matter to another matter. Energy can be transferred in two forms that are by doing work or by transferring heat.
Heat can be transferred by three ways conduction, convention and radiation. In conduction, when two object are in direct contact, transfer of molecules takes place. Convection is the flow of heat from one layer of liquid to another layer. Heat energy is released when we burn natural gas. This reaction is called combustion reaction.
Therefore, heat energy is released when we burn natural gas.
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what is the name of a solution whose concentration of solute is equal to the maximum concentration that is predicted from the solutes solubility
Answer: DILUTE SATURATED
Explanation:
Answer:
b. saturated
Explanation:
(:
You are given a cube of pure copper when you calculate the density using
your measurements, you get 8.78 grams/cm3. Copper's accepted density
is 8.96 g/cm3. What is your percent error? *
Answer:
2.01% to the nearest hundredth.
Explanation:
Percent error =[ (8.96-8.78) / 8.96]* 100
= 0.020089 * 100
= 2.0089 %
The Percent error is 2.01% to the nearest hundredth.
How to calculate the percent error?Suppose the actual value and the estimated values after the measurement are obtained. Then we have:
Error = Actual value - Estimated value
To calculate percent error, we will measure how much percent of actual value, the error is, in the estimated value.
[tex]\rm Percent \: Error = |\dfrac{Error}{Actual value}|\times 100 \\\\[/tex]
[tex]Percent \: Error = | \dfrac{\text{(Actual Value - Estimated Value)}}{Actual value}|\times 100 \\[/tex]
(here |x| is such that it makes x non negative, thus, |-5| = 5, and |5| = 5)
WE have been given a cube of pure copper when you calculate the density using your measurements, you get 8.78 grams/cm3. Copper's accepted density is 8.96 g/cm3.
Percent error =[ (8.96-8.78) / 8.96]* 100
= 0.020089 * 100
= 2.0089 %
Hence, the Percent error is 2.0089 %.
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Perform the following calculations and express the answer with the proper significant
figures
210.6 mm + 14.57 mm -
Answer:
The answer is
210.6+14.57=225.17mm.
Answer:
Explanation:
0.15 MG +1.15 MG +2.051 MG
PLEASE HELP WITH CHEM CLASS!!!!!
Please please please !! Explain depth. Please !!!!
Answer:
The answers to your questions are given below
Explanation:
1. KClO3 => Potassium trioxochlorate (V)
Thermal decomposition of KClO3.
When we heat potassium trioxochlorate (V), KClO3, it will slip into two producing potassium chloride, KCl and oxygen gas, O2 as shown below:
2KClO3(s) —> 2KCl(s) + 3O2(g)
Note: the above reaction will occur faster and at a lower temperature in the presence of manganese (iv) oxide as catalyst.
2a. Determination of the number protons and neutrons in Nitrogen–14.
Nitrogen–14 has the following:
Mass number = 14
Atomic number = 7
Proton =?
Neutron =?
Atomic number of an atom is simply the proton number. Therefore,
Proton = Atomic number
Atomic number = 7
Proton = Atomic number = 7
Proton = 7
Mass number = Proton + Neutron
Mass number = 14
Proton = 7
Neutron =?
14 = 7 + Neutron
Collect like terms
Neutron = 14 – 7
Neutron = 7
Therefore, Nitrogen–14 has 7 protons and 7 neutrons.
2b. Determination of the number protons and neutrons in Nitrogen–15.
Nitrogen–15 has the following:
Mass number = 15
Atomic number = 7
Proton =?
Neutron =?
Atomic number of an atom is simply the proton number. Therefore,
Proton = Atomic number
Atomic number = 7
Proton = Atomic number = 7
Proton = 7
Mass number = Proton + Neutron
Mass number = 15
Proton = 7
Neutron =?
15 = 7 + Neutron
Collect like terms
Neutron = 15 – 7
Neutron = 8
Therefore, Nitrogen–15 has 7 protons and 8 neutrons.
Homeostasis subheading
The maintenance of stable internal conditions is called
Answer:
homeostasis•the maintenance of a stable internal environment
Hope this helps :)
Help plz this was due 2 days ago but I don’t understand it at all
Answer:
4 mile : 253440 inches
0.004 grams : 1.814 grams
56 miles/hour : 82.133 feet per second
4.5 ml : 0.45 centilitre
34.g/ml : 74.9571691 lb/liter
30 lb: 480 ounces
Why does paper "brown" after a while?
Answer:
Exposure to oxygen (especially when combined with sunlight) alters the molecular structure of lignin, causing a change in how the compound absorbs and reflects light, resulting in the substance containing oxidized lignin turning a yellow-brown color in the human visual spectrum.
difference between speed and velocity
Answer:
speed is a scalar quantity and velocity is a vector quantity.
Speed is distance/time and velocity is displacement/time
Answer:
Velocity is vector and speed is scalar
Explanation:
what is mean by exhaustible natural resources of list some
Answer:
enr are those resources which are present in limited quality and can be use completely used up by human activities are called enr .example coal petrol