T = final temperature of the block
T₀ = initial temperature of the block = 23.4 °C
Q = energy lost from the wooden block = - 759 J
c = specific heat capacity of wood = 1.716 J/(g °C)
m = mass of the wooden block = 27.2 g
Heat lost from the block is given as
Q = m c (T - T₀)
inserting the values
- 759 = (27.2) (1.716) (T - 23.4)
T = 7.1 °C
The final temperature of a 27.2-gram wooden block is 7.1 °C. The correct option is A.
What is temperature?Temperature is the measurement of the hotness or coldness of the body. It is denoted by Kelvin.
By specific heat equation
[tex]Q = mc (T - T_\circ)[/tex]
where T = final temperature
T₀ is the initial temperature =23.4 °C
Q is lost energy from the block = - 759 J
c is specific heat = 1.716 joules/gram
m is the mass of the block = 27.2 g
Putting the values in the equation
[tex]\rm - 759 = (27.2) (1.716) (T - 23.4) = 7.1_\circ C[/tex]
Thus, the correct option is A is 7.1 °C.
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If pecans sale for three dollars per pound and there are 127 pecans per pound how many pecans can you buy for $14.12
With $14.12, and a price of $3 per pound, you can buy 4 pounds of pecans, which equates to 508 pecans, since each pound has 127 pecans.
Explanation:To determine how many pecans can be bought for $14.12, we need to calculate the number of pounds that can be purchased and then multiply by the number of pecans per pound. The given price is $3 per pound, and there are 127 pecans per pound.
First, divide the total amount of money by the price per pound:
$14.12 ÷ $3.00 = 4.7067 pounds
Since you cannot purchase a fraction of a pecan, we need to find the maximum whole number of pounds that can be bought with $14.12, which is 4 pounds. Multiplying this number by the number of pecans per pound gives the total number of pecans that can be bought:
4 pounds × 127 pecans/pound = 508 pecans
Therefore, you can buy 508 pecans for $14.12.
Why does aluminium oxide (Al2O3) have a higher melting point than sodium oxide (Na2O)?
Al2O3 has a higher melting point than Na2O. This is because the ionic bond between Al3+ ions and O2- ions is stronger than that between Na+ and O2-. The charge on the Al3+ ion is larger than that of the Na+ ion
Aluminium oxide has a higher melting point than sodium oxide due to the stronger bonding in its crystal lattice and higher lattice energy, which requires more energy to break the bonds during melting.
Explanation:The reason why aluminium oxide (Al2O3) has a higher melting point than sodium oxide (Na2O) lies in their different types of bonding and bond strengths. Al2O3 is an ionic compound but with some covalent character, meaning that it has stronger bonds and thus requires more energy to break those bonds, leading to a higher melting point. This difference is largely a result of the contrast in the charge and size of the ions involved.
In contrast, Na2O is purely ionic and made up of larger ions with a lower charge. Consequently, Na2O has a weaker lattice energy than Al2O3, implying that less energy is needed to break the bonds in its structure, resulting in a lower melting point.
Furthermore, lattice energy is directly related to melting points in ionic substances that have similar structures. This underlines why Al2O3 with its higher lattice energy has a higher melting point compared to Na2O.
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Scientists put a few drops of dilute hydrochloric acid on a lab table. For safety purposes, the scientist because some baking soda on to the spill. Which observation would provide the best evidence that chemical reaction occurred?
F. The baking soda in hydrochloric acid combined, and bubbles formed.
G. The baking soda absorb the hydrochloric acid.
H. Some of the baking soda dissolved in the acid
J. The hydrochloric acid evaporated, Leaving only the baking soda
Answer:
F. The baking soda combined with the hydrochloric acid and bubbles formed.
Explanation:
The formation of gas bubbles is usually a sign of a chemical reaction.
G. is wrong because the absorption of a liquid by a solid is a physical process. Think of using a paper towel to clean up spilled water.
H. is wrong because the dissolving of a solid is a physical process. Think of dissolving sugar in your coffee.
J. is wrong because evaporation is a physical process. Think of a puddle of water drying up in the hot sun.
If Spongebob is under water than what is the substance beneath the water that they swim in
Answer:
The seafloor
Explanation:
the bottom of the ocean, aka the sea floor.
usually made from sand
Answer:
H2O
Explanation:
Which of the following is the electron configuration of an electrically neutral atom of argon (Ar)?
(a) 1s² 2s² 2p5
(b) 1s² 3d¹⁰ 4f⁷
(c) 1s² 2s² 2p⁶ 3s² 3s⁶
(d) 1s² 2s1
What mass of carbon dioxide is produced from the complete combustion of 6.40*10^-3 g of methane
Answer:- [tex]1.76*10^-^2[/tex] g of carbon dioxide.
Solution:- The balanced equation for the combustion of methane is:
[tex]CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]
There is 1:1 mol ratio between methane and carbon dioxide. Grams of methane are converted to moles and then using mol ratio we get the moles of carbon dioxide that could further be converted to grams. The calculations are shown as:
[tex]6.40*10^-^3gCH_4(\frac{1molCH_4}{16gCH_4})(\frac{1molCO_2}{1molCH_4})(\frac{44gCO_2}{1molCO_2})[/tex]
= [tex]1.76*10^-^2gCO_2[/tex]
So, complete combustion of given amount of methane gives [tex]1.76*10^-^2gCO_2[/tex] .
what is the pH level of powdered sugar?
Please help, How can genetic variations benefit a species? Give an example.
Will give brainliest!! Explain how extinct organisms have left their evidence behind, which scientists now study.
theyre fossils, when extinct beings such as dinosaurs died their bones would sometimes get stuck in clay or amber (i cant remember if theres any other types of rock) or sediment) and stay there for years and years then scientist called Paleontologists find them and study them. hope this helps:)
Answer:
What is meant by extinct How do scientists obtain information about extinct species?
How do scientists obtain information about extinct species? A species is extinct if no members of that species are still alive. Most of what scientists know about extinct species is based on the fossil record. What are mass extinctions?
Explanation:
How many termination code words are there?
There're three termination codons
IN RNA IN DNA NAME
UAG TAG "amber"
UAA TAA "ochre"
UGA TGA "opal"
Answer:
There are three termination code words.
Explanation:
From the question stated, we have three termination code words as shown below.
IN RNA IN DNA NAME
UAG TAG "amber"
UAA TAA "ochre"
UGA TGA "opal"
Is N2 + 3H2 →2NH3 a balanced chemical equation? Is it obeying the law of conservation of matter?
Yes, this is a balanced chemical equation, and it obeys the Law of Conservation of Mass.
A balanced chemical equation obeys the Law of Conservation of Mass if there are the same numbers of each type of atom on each side of the reaction arrow.
N₂ + 3H₂ ⟶ 2NH₃
Let’s check the numbers.
Atom On the left On the right
N 2 2
H 6 6
We have the same numbers of H and O on each side of the reaction arrow.
The equation is balanced and it obeys the Law of Conservation
of Mass.
Which statements describe the six elements found in all living things? Check all that apply.
Carbon is the basis of all living things.
Sulfur is found in bones, where it provides strength.
Nitrogen is found in certain foods.
Oxygen and hydrogen combine with each other to form water.
Only carbon, hydrogen, and phosphorus are found in organic compounds.
Carbon, oxygen, hydrogen, nitrogen, phosphorus, and sulfur are found in organic compounds.
Answer:
Carbon is the basis of all living things
Nitrogen is found in certain foods
Oxygen and hydrogen combine with each other to form water
Carbon, oxygen, hydrogen, nitrogen, phosphorus and sulfur are found in organic compounds
Explanation:
We are all made up of mainly three elements, Carbon, Hydrogen, and Oxygen. These three elements are found in every living organism on our planet, and along with a few trace elements, they make up all the nutrients we take in and use to build our bodies and survive.
Nitrogen is primarily found in meats, and this is because nitrogen is a key element in amino acids (which are used to build proteins), however we cannot directly assimilate nitrogen from the air, so we have to assimilate it through amino acids already synthesized in plants, or in proteins found in meat.
The chemical formula for water is H₂O. Seeing the chemical formula, it is obvious that hydrogen and oxygen are the only elements in the water molecule.
In our bodies, we use phosphorus to form our skeleton and help maintain it, sulfur and nitrogen can be found in some amino acids, and carbon, hydrogen and oxygen can be found in carbohydrates, lipids and proteins.
Answer:
Carbon is the basis of all living things
Nitrogen is found in certain foods
Oxygen and hydrogen combine with each other to form water
Carbon, oxygen, hydrogen, nitrogen, phosphorus and sulfur are found in organic compounds
Explanation:
LOL FREE POINTS
A thermometer shows that the temperature of the air in a room has increased.Which type of energy has increased?
Kinetic energy has increased.
The Kinetic Molecular Theory of gases states that the average kinetic energy of the molecules of a gas is directly proportional to its Kelvin temperature.
Thus, if the temperature of the air in a room has increased, the average kinetic energy of its molecules has increased.
in this equation 2mg+o2=2mgo what is the coefficient to the oxygen molecule
A,2
B,4
C,1
D,0
Hello!
In this chemical equation, there are two main elements. Those elements are magnesium (Mg) and oxygen (O).
Molecules are a group of atoms bonded together, and in this case, the oxygen molecules is O2, but not 2MgO because there are two different molecules in this compound.
Coefficients are a number that multiply an entire molecule, and are also placed in front of it. In this case, O2 has no coefficient, but a subscript of 2. But, every molecule in this equation must have a coefficient and if add a coefficient of 1 to the oxygen molecule, it does nothing to the overall balancing of equations.
Therefore, the coefficient to the oxygen molecule is choice C, 1.
We have that It is seen from the equation that the Number or variable that Precedes the Oxygen atom is 1
Option C
From the question we are told
in this equation 2mg+o2=2mgo what is the coefficient to the oxygen molecule
A,2
B,4
C,1
D,0
Generally
Coefficient of a molecule is the digit, Number or variable that precedes the Molecule
Therefore
It is seen from the equation that the Number or variable that Precedes the Oxygen atom is 1
Option C
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Which word in the sentence is the predicate adjective? The glowing red coals looked incredibly hot. A. red B. hot C. glowing D. incredibly
The correct answer should be
D: incredibly
Best Answer: d
the subject is who or what you are talking about- the glowing red coals
the predicate is what they are doing- looked incredibly hot
looked is your verb because that is what they are doing, how did they look? they looked hot, that is the adverb. the word that describes hot is incredibly, that is the pred adj. because adjectives describe.
In a longitudinal wave, the _________ is the distance from one compression to the next compression or from one rarefaction to the next rarefaction. WILL MARK BRAINLIEST
Final answer:
The wavelength in a longitudinal wave is the distance from one compression to the next compression or from one rarefaction to the next rarefaction.
Explanation:
In a longitudinal wave, the wavelength is the distance from one compression to the next compression or from one rarefaction to the next rarefaction. This is akin to the peak to peak or trough to trough measurement in transverse waves.
Within the cycle of a longitudinal wave, areas of high pressure, or compressions, where the particles are closest together, and areas of low pressure, or rarefactions, where the particles are further apart, alternate regularly. Consequently, the wavelength can be perceived as the spatial period of the wave—the distance over which the wave's shape repeats.
The understanding of these concepts is crucial for analyzing wave behaviors, such as sound propagation, and the impacts of phenomena like the Doppler effect.
Descending into Earth’s interior, temperature, as well as pressure on rock, _____.
1 remains fairly constant
2 increases
3 varies seasonally
4 decreases
What is the empirical formula of a substance that consists of 0.910 g calcium, 0.636 g nitrogen, and 1.453 g oxygen?
You need to change them to mole
mole = mass / Molar mass
mole of Ca = 0.910 g / 40.08 g/mol = 0.0227 mol
mole of N = 0.636 g / 14.01 g/mol = 0.04539 mol
mole of O = 1.453 g / 16.00 g/mol = 0.0908 mol
Then, take the smallest number and divide for all number (in mol that I just found)
Ca = 0.0227 / 0.0227 = 1
N = 0.04539 / 0.0227 = 1.9999 (round it 2)
O = 0.0908 / 0.0227 = 4
So the empirical formula will be Ca1N2O4 ( CaN2O4 )
You have 47.0 mL of a 0.400 M stock solution that must be diluted to 0.100 M. Assuming the volumes are additive, how much water should you add?
Hey there!
Moles of stock solution:
47.0 mL in liters : 47.0 / 1000 => 0.047 L
n = M * V
n = 0.400 * 0.047
n = 0.0188 moles
Volume final :
M = n / V
0.100 = 0.0188 / V
V = 0.0188 / 0.100
V = 0.188 L => 188 mL
Therefore Watter added :
volume final - volume initial
188 mL - 47.0 mL => 141 mL
Hope That helps!
For the following gases, correct the volumes to the conditions indicated. A.654 cm3 at 6 degrees Celsius and 65.3 kPa to 4 degrees Celsius and 108.7 kPa
Initial pressure of the gas = 65.3 kPa
Initial volume of the gas = 654 cm³
Initial temperature of the gas = 6⁰C = 273 + 6 = 279 K
Final pressure of the gas = 108.7 kPa
Final temperature of the gas = 4⁰C = 273 + 4 = 277 K
Using the combined gas law for ideal gases:
P₁V₁/T₁ = P₂V₂/T₂
where P₁, V₁ and T₁ are the pressure, volume and temperature for the initial state and P₂, V₂ and T₂ are the pressure, volume and temperature for the final state.
Plugging the given data into the combined gas law we have,
(65.3 kPa x 654 cm³) / (279 K) = (108.7 kPa x V₂)/(277 K)
V₂ = (65.3 kPa x 654 cm³ x 277 K) / (279 K x 108.7 kPa)
V₂ = 390.1 cm³
I need really quick help right now!
Answer this quetion plz: A solid is cooled to a very low temperature. Assuming the mass remains constant, how, if at all, does this affect the density of the solid? Enter your answer in the space provided.
most solids contract (shrink) when they get cold.
Density = (mass) / (volume)
If mass doesn't change but volume gets smaller, then density increases.
A student designs an experiment where she will add varying amounts of sugar to a chemical reaction and then measure the mass of the chemicals produced during each reaction. The independent variable in this experiment is:
A) The amount of sugar
B) The mass of the chemical produced
C) The temperature of the reaction
D) The type of chemical reaction
A. The amount of sugar
Answer: A) The amount of sugar
Explanation:
The independent variable is the one which can be changed, altered or even manipulated manually so as to bring changes and alteration over the dependent variable. The dependent variable is the variable in which changes occur due to independent variable. It is the outcome of the experiment.
The amount of sugar is the correct option. This is because of the fact that amount of sugar can bring a change over the chemical reaction and mass of chemicals being produced.
Writing net ionic equation.
Sn(No3)2(aq)+K2S(aq) -> SnS(s)+2KNO3(aq)
Hey There!
Expand soluble ions to get complete ionic equation:
Sn²⁺(aq) + 2 NO³⁻(aq) + 2 K⁺(aq) + S²⁻(aq) :
SnS(s) + 2 K⁺(aq) + 2 NO³⁻(aq)
Cancel common ions to get net ionic equation:
Sn²⁺(aq) + S²⁻(aq) => SnS(s)
Hope that helps!
To obtain the whole ionic equation, expand the soluble ions:
What is meant by soluble ions ?Water molecules surround and solvate the ions, weakening the strong electrostatic interactions between them, which causes the ions to separate and spread equally throughout the solution when ionic compounds dissolve in it.
Equations become :
Sn²⁺(aq) + 2 NO³⁻(aq) + 2 K⁺(aq) + S²⁻(aq) :
SnS(s) + 2 K⁺(aq) + 2 NO³⁻(aq)
To obtain the net ionic equation, eliminate common ions:
Sn²⁺(aq) + S²⁻(aq) => SnS(s)
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Identify the type of reaction represented by each equation.
A: H2 + Cl2 → 2HCl
B: CH4 + 2O2 → CO2 + 2H2O
Equation A represents a _________ reaction, and equation B represents a_______ reaction.
choices for both blanks
combustion
decombustion
synthesis
double displacement
single displacement
choose one for each blank
there are some notes and examples in the images
my opinions are
1.blank---snythesis
2blank--combustion
please tell me if im correct
16pionts
Answer : Equation A represents a synthesis reaction, and equation B represents a combustion reaction.
Explanation :
A : [tex]H_2+Cl_2\rightarrow 2HCl[/tex]
Equation A is a synthesis reaction in which the two reactants combine to form a single product.
B : [tex]CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]
Equation B is a combustion reaction in which the a hydrocarbon react with an oxygen to give carbon dioxide and water a s a product.
Hence, the equation A represents a synthesis reaction, and equation B represents a combustion reaction.
From the illustration, the type of reaction represented by equation A would be a synthesis reaction while that of B would be a combustion reaction.
In synthesis reactions, two or more atoms of different elements or molecules come together to form a product. In equation A, H2 and Cl2 come together to form HCl. Thus, A is a synthesis reaction.
In combustion reactions, substances react in oxygen to generate new products, usually accompanied by light and the generation of heat. In equation B, CH4 reacts with O2 to produce CO2 and H2O with the production of heat. Thus, B is a combustion reaction.
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What happens to particles in a solid when heat is applied?
Answer: The particles move faster and spread further apart
Explanation:
Modern atomic theory states that atoms are neutral. How is this neutrality achieved ? A. Equal number of neutrons and protons B.Equal number of protons and electrons C. More electrons than protons C. More neutrons than electrons
Answer: Option (B) is the correct answer.
Explanation:
An atoms consists of protons, neutrons and electrons. Protons are positively charged, neutrons have no charge and electrons are negatively charged.
Also, when an atom is neutral then there are equal number of protons and electrons.
For example, a neutral sodium atom has 11 protons and 11 electrons.
Therefore, we can conclude that modern atomic theory states that atoms are neutral as they have equal number of protons and electrons.
Help please, a 20 point reward for those who do help!!!!
A piece of unknown metal with mass 68.6 g is heated to an initial temperature of 100 °C and dropped into 8.4 g of water (with an initial temperature of 20 °C) in a calorimeter. The final temperature of the system is 52.1°C. The specific heat of water is 4.184 J/g*⁰C. What is the specific heat of the metal?
A. 0.171
B. 0.343
C. 1.717
D. 3.433
Answer:- B. 0.343
Solution:- Hot metal is added to water so the heat is gained by water and lost by the metal. We assume no heat is lost to the surroundings, so the heat lost by metal is totally used to raise the temperature of water.
First, we will calculate the heat gained by water using the formula:
[tex]q=mc\Delta T[/tex]
where, q is the heat energy, m is the mass, c is specific heat and delta T is change in temperature.
For water:
m = 8.4 g
c = [tex]\frac{4.184J}{g.^0C}[/tex]
[tex]\Delta T=52.1-20=32.1 ^0C[/tex]
Let's plug in the values and calculate q for water:
[tex]q=(8.4g)(\frac{4.184J}{g.^0C})(32.1^0C)[/tex]
= 1128.17 J
Same amount of heat is lost by the metal. Mass of metal is 68.6 g.
[tex]\Delta T=100-52.1=47.9^0C[/tex]
let's plug in the values in the same formula and calculate the specific heat of metal:
[tex]1128.17J=(68.6g)(c)(47.9^0C)[/tex]
[tex]c=\frac{1128.17J}{(68.6g)(47.9^0C)}[/tex]
[tex]c=\frac{0.343J}{g.^0C}[/tex]
So, the right choice is B.0.343.
Answer:
B
Explanation:
Got it right on ODY(Oddesyware) ;) have an amazing day y'all
would a reaction occur if a ZnSo4 solution and a SnSO4 solution were mixed?
Hey there!
No !! there is nothing to react. What else other than tin sulphate and zinc sulphate can you make - but then you have only what you started with .
Hope that helps!
If a ZnSO4 solution and a SnSO4 solution were mixed there will be no reaction.
Even though zinc is above tin in the electrochemical series, there will be no reaction when a ZnSO4 solution and a SnSO4 solution were mixed because the two compounds have the same anion.
Displacement reaction only occurs when two compounds have different anions and one of the metal cations involved is lower than the other in the electrochemical series.
From the explanation above, it is clear that, if a ZnSO4 solution and a SnSO4 solution were mixed there will be no reaction.
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The equation for density is mass divided by volume. An increase in density can result from all of the following except...
What are the options? An increase in density does not occur in an increase of volume or a decrease of mass.
An object has a mass of 20 g and displaces a volume of 5 mL. What is the object's density?
Hey There!:
The density is the quotient between the mass of a material and the volume occupied by it, The density can be expressed for a substance or for a mixture of substances. For example, water density in ambient conditions is equal to 1.00 g/cm3, which means that in 1 cm³ or 1 mL, there are 1.0 g of water. Therefore:
D = m / V
D = 20 g / 5 mL
D = 4,0 g/mL
hope that helps!
The density of the object will be "4 g/mL". A further solution is provided below.
The given values in the question are:
Mass,
M = 20 g
Volume,
V = 5 mL
The density of the object will be:
→ [tex]Density = \frac{Mass}{Volume}[/tex]
By substituting the values, we get
→ [tex]= \frac{20}{5}[/tex]
→ [tex]= 4 \ g/mL[/tex]
Thus the above answer is right.
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