Answer:
68.4°C is the final temperature of the water
Explanation:
In this problem, the heat lost by the water is equal to the heat lost by the sample of glass, that is:
W(Gl)*S(Gl)*ΔT(Gl) = W(H₂O)*S(H₂O)*ΔT(H₂O)
Where W is mass (Gl = 33.0g; H₂O = 200.0g)
S is specific heat (Gl = 0.670J/g°C; H₂O = 4.184J/g°C)
And ΔT is change in temperature ( Gl = T-7.6°C; H₂O = 70.0°C-T)
Replacing:
33.0g*0.670J/g°C*(T-7.6°C) = 200.0g*4.184J/g°C*(70.0°C-T)
22.11*(T-7.6) = 836.8*(70.0-T)
22.11T - 168.04 = 58576 - 836.8T
858.91T = 58744.04
T = 68.4°C is the final temperature of the water
during periods of strenuous activity muscle cells run low on
Answer: the answer is in the photo pls check and pls pls mark me as brainliest
Explanation:
During periods of strenuous activity muscle cells run low on oxygen.
What are muscle cells?Muscle cells are defined as the cellular components of muscle tissue. Muscle cells are designed to contract, or produce a pulling force, in order to stabilize or move different body parts. Skeletal, visceral, and heart muscle cells are the three different types. They are located in the organs' hollow walls. The muscular system is made up of a variety of muscle types, each of which is essential to how the body works.
Lactic acid is produced and accumulates in the muscle when there is a high energy demand, rapid changes in the energy requirement, and a lack of oxygen. During prolonged, intense activity, muscle pH falls to 6.4–6.6. Your muscles are forced to contract as forcefully as they can during this form of exercise, which results in an increase in the number of contractile filaments in your muscle cells.
Thus, during periods of strenuous activity muscle cells run low on oxygen.
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what is the volume, in liters, of 5.500 mol of C3H3 gas at STP
Answer:
123.2 Liters.
Explanation:
At STP (T = 273K & P = 1atm), one mol of any gas will occupy 22.4 liters.
With the above information in mind, we can calculate how many liters would 5.500 mol of gas occupy:
5.500 mol * 22.4 L / mol = 123.2 L
So 5.500 moles of C₃H₃ would have a volume of 123.2 liters at STP.
what explains the bonding in a compound made from carbon and hydrogen
1) ch4 because every hydrogen gets two electrons to bond
2) ch4 because 8 electrons are shared in this molecule
Answer:
2) ch4 because 8 electrons are shared in this molecule
Explanation:
The bond between carbon and hydrogen in the molecule; CH4 is a covalent bond. This bond involves sharing of electrons. Carbon has a valency of 4 and needs four more electrons to complete it's electronic configuration. These 4 electrons are taken care of by the 4 hydrogen atoms which each have a valency of 1.
Aside from direct harm, what secondary issue do invasive species present?
They may be able to eat all kinds of native organisms.
They might introduce other organisms like viruses and bacteria.
They might damage the habitat that other organisms rely on.
They may not have any predators.
Answer:
B
Explanation:
50 POINTS!! PLZ HELP! SCIENCE QUESTION!
Answer:
C im pretty sure
Explanation:
Because it is facing the opposite direction with opposite colors.
HELPPP PLZz nowww!!!
A. C
B. B
C. A
D. D
Answer:
b
Explanation:
Answer:
answer b I think so I'm.not clear about it ,I think its CRT ans plz follow me
The churning movement of the mantle is due to
А
fault lines.
B
erupting volcanoes.
C
convection currents.
D
plate tectonics.
Answer:
the answer should be D, I hope this helps!
what is the mass of 5 litres of oxygen at STP
Answer:
First and foremost, keeping in mind that at room temperature, Oxygen is a gas.
So, Volume of Oxygen(O2) given = 5.6L.
Finding moles, Moles=Volume/22.4.
Moles= 5.6/22.4=1/4moles.
So, finding mass of O2= moles × Mol. Wt.
Mass( in grams) = 1/4 × 32. We have taken 32 as oxygen is is combined state O2, so 16×2=32.
We get, mass =8 grams. This is mass not active mass.
Active mass means molarity which will be
0.25/5.6= 0.044
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According to standard temperature and pressure conditions, the mass of 5 litres of oxygen is 0.157 g.
What are standard temperature and pressure conditions?Standard temperature and pressure are defined as a standard set of conditions required for experimental measurements which are established to allow comparison between different sets of data.
Standards which are commonly used are those International Union of pure and applied chemistry and national institute of standards and technology.These are not universally accepted standards but are the ones which are commonly used.
According to ideal gas equation, mass=PV×molar mass/RT= 1×22.4×16/8.314×273=0.157 g.
Thus, the mass of 5 litres of oxygen is 0.157 g.
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Draw the structure of the product formed when the given compound is heated in aqueous base. The formula for the product is C8H12O. The starting material is a 6 carbon chain where carbon 1 is an aldehyde, carbon 2 has two methyl substituents and carbon 4 is double bonded to an oxygen. THis reacts with N a O H, water and heat.
Answer:
Please find the graph file in the attachment file.
Explanation:
Molecules in a substance change into a new kind of molecule during a phase change.
Answer:
A phase change is occurring; the liquid water is changing to gaseous water, or steam. On a molecular level, the intermolecular forces between the water molecules are decreasing. The heat is providing enough energy for the water molecules to overcome these attractive forces.
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The phase transition takes place at the molecular level by changing the strength of intermolecular forces between the molecules.
What is phase change?Phase changes can be defined as the physical processes of transition between a state of a medium, identified by some parameters. These changes in states of matter that can be written as liquid, gas, solid, and plasma.
A particular phase in a thermodynamic system exhibits uniform physical properties. During a phase transition, some properties of the medium change, because of the change in external conditions, such as temperature, and pressure.
In a solid state, the molecules are compactly bound by a strong force of attraction. In the liquid state, the molecules have lesser attraction forces. The phase changes depend upon the temperature and pressure.
Therefore, phase transitions occur on a molecular level as the alteration in the strength of intermolecular forces.
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how are elements classified organized?
It is device used to measure thee temperature of food/fish
HELP ME PLEASE!!!!! I NEED TO GET THIS RIGHT I CANT FAIL
The following reaction shows the products when sulfuric acid and aluminum hydroxide react.
2Al(OH)3 + 3H2SO4 → Al2(SO4)3 + 6H2O
The table shows the calculated amounts of reactants and products when the reaction was conducted in a laboratory.
Initial Mass and Yield:
Sulfuric Acid Aluminum Hydroxide
Initial Amount of Reactant 40 g 1.5 g
Theoretical Yield of Water from Reactant 14.69 g 10.38 g
What is the approximate amount of the leftover reactant? (4 points)
a.11.73 g of sulfuric acid
b.10.33 g of sulfuric acid
c.11.12 g of aluminum hydroxide
d.13.67 g of aluminum hydroxide
Answer:
c.11.43 g of aluminum hydroxide
Explanation:
Which sentences describe decomposers in a food chain?
They are the final link in the energy flow in a food chain or a food web. They are fungi and animals that feed on dead organic matter. Plants
produce food or energy from raw materials. Plants are also known as autotrophs because they can produce organic compounds from inorganic
chemicals. Bacteria, fungi, worms, and snails recycle the garbage of dead matter and give back nutrients into the ecosystem.
Answer:
hey are the final link in the energy flow in a food chain or a food web. They are fungi and animals that feed on dead organic mattet.
Explanaticuz im naruto uzamaki
what happens to some of the electrons in an atom when the atom is heated
Answer:
When the electrons in the atom are excited, for example by being heated, the additional energy pushes the electrons to higher energy orbitals. When the electrons fall back down and leave the excited state, energy is re-emitted in the form of a photon
Explanation:
How many moles of Cu are in 1.48 × 1025 Cu atoms?
24.6 mol Cu
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
MolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 1.48 × 10²⁵ atoms Cu
[Solve] moles Cu
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[DA] Set up: [tex]\displaystyle 1.48 \cdot 10^{25} \ atoms \ Cu(\frac{1 \ mol \ Cu}{6.022 \cdot 10^{23} \ atoms \ Cu})[/tex][DA] Divide [Cancel out units]: [tex]\displaystyle 24.5766 \ mol \ Cu[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
24.5766 mol Cu ≈ 24.6 mol Cu
hen CO(g) reacts with O2(g) to form CO2(g) , 283 kJ of energy are evolved for each mole of CO(g) that reacts. Write a balanced thermochemical equation for the reaction with an energy term in kJ as part of the equation. Note that the answer box for the energy term is case sensitive. Use the SMALLEST INTEGER coefficients possible and put the energy term (including the units) in the last box on the appropriate side of the equation. If a box is not needed, leave it blank.
Answer:
2CO + O2 =====> 2CO2 ΔH = -566 KJ
Explanation:
A thermochemical equation is a chemical equation that includes the enthalpy change of the reaction (Lumen Learning).
In a thermochemical equation, we can easily see the heat of reaction written after the symbols of reactants and products. It tells us whether heat was evolved or gained in the chemical process. When heat is gained ΔH = positive. When heat is evolved, ΔH = negative.
The thermochemical equation for the reaction of CO and O2 is shown below;
2CO(g) + O2(g) =====> 2CO2 (g) ΔH = -566 KJ
A gas
A. has a definite shape but no definite volume.
B. Has both a definite shape and a definite volume.
C. Has a definite volume but no definite shape.
D. Has no definite shape and no definite volume.
Answer:
D
Explanation:
Has no definite shape and no definite volume
Consider the reaction that occurs between the acid CHOOH and the base CH3CH2NH2.
A) Draw the complete Lewis structures for the acid and the base.
B) Explain why OOH is more acidic than CH3CH2NH2.
C) Explain why CH3CH2NH2 is more basic than CHOOH.
D) Re-draw your Lewis structures from part a. Add to these structures to show why these two molecules are attracted to each other. Do not show a curved arrow mechanism here.
E) Using curved arrows, show the reaction mechanism for the reaction of CHOOH with CH3CH2NH2.
F. Using the Lewis definition of acid-base reactions, explain what is happening at the molecular level during this reaction.
Answer:
See explanation
Explanation:
The compound CHOOH is more acidic than CH3CH2NH2 because the carbonyl group is strongly electron withdrawing hence electron density is withdrawn from the O-H bond making easier for the proton to be lost.
CH3CH2NH2 is more basic than CHOOH because of the lone pair of electrons on the nitrogen atom of CH3CH2NH2. This is reinforced by the electron pushing effect of the CH3CH2-group thereby making the amine more basic(able to abstract a proton) than CHOOH .
The images attached show the structures of CHOOH and CH3CH2NH2 . They are able to react because of the proton in CHOOH and the lone pair of electrons in CH3CH2NH2 as shown in image III. This is a reaction in which the lone pair on CH3CH2NH2 abstracts a proton from CHOOH leading to the formation of the products as shown.
What is the mass of 2.9 moles of calcium? Show all work!
Answer:
the mass of 2.9 moles of calcium is 116 g
Explanation:
The computation of the mass of 2.9 moles of calcium is shown below
As we know that
Mole = mass ÷ molar mass
where,
Moles be 2.9
And, we know that the molar mass of calcium be 40g/mol
Now put the values to the above formula
2.9 = Mass ÷ 40
So, the mass would be
= 40 × 2.9
= 116 g
Hence, the mass of 2.9 moles of calcium is 116 g
For each molecule, specify the polarity of the bonds and the overall polarity of the molecule.
A. A central beryllium atom is connected to two chlorine atoms through single bonds.
B. Each chlorine atom has three lone pairs of electrons.
C. A central oxygen atom is connected to two hydrogen atoms through single bonds.
D. There are two lone pairs of electrons around the oxygen atom.
Are the bonds for each one polar or non polar? Are the molecules for each one polar or non polar?
A. BeCl2
B. H2O
C. O3
Answer:
See explanation
Explanation:
We know that the possession of polar bonds does not make a molecule polar. The BeCl2 molecule has Be-Cl bonds which are polar. However, the molecule is symmetrical and has a zero net dipole moment hence the molecule is nonpolar.
H2O is a polar molecule. It has polar O-H bonds. The molecule is bent and has a resultant dipole moment hence it is polar.
Ozone is a triatomic molecule which is bent in shape. This bent geometry creates an overall dipole moment in the molecule, hence the molecule is polar.
A balloon is filled with 30.0 L of helium in the morning when the temperature is 25.00 ℃. By noon the temperature has risen to 55.00 ℃. Determine the new volume of the balloon. *
Answer:
33.0 L
Explanation:
Step 1: Given data
Initial volume of the balloon (V₁): 30.0 LInitial temperature (T₁): 25.00 °CFinal volume of the balloon (V₂): ?Final temperature (T₂): 55.00 °CStep 2: Convert the temperatures to the Kelvin scale
We will use the following expression.
K = °C + 273.15
T₁: K = 25.00°C + 273.15 = 298.15 K
T₂: K = 55.00°C + 273.15 = 328.15 K
Step 3: Calculate the final volume of the balloon
If we assume ideal behavior, we can calculate the final volume of the balloon using Charles' law.
V₁/T₁ = V₂/T₂
V₂ = V₁ × T₂/T₁
V₂ = 30.0 L × 328.15 K/298.15 K = 33.0 L
NEED HELP ON THIS NOW PLEASE
Answer:
A. Bees bringing pollen from the flower of one plant to the flower of another plant.
Explanation:
Genetic diversity in organisms is enhanced by the process of sexual reproduction due to the meiotic process that the participant organisms undergo to produce gametes. A process unique to meiosis called CROSSING OVER ensures that the alleles of genes are recombined in the GAMETE or sex cells.
According to this question, POLLINATION, which is the transfer of pollen from a male flower to a female one, will lead to sexual reproduction via fertilization. However, a cross-pollination, which requires a pollinator like the bees in this question will ensure the most genetic diversity among the offsprings.
Please help! Will give brainliest
Answer:
Letter C is the answer Hope it helps!
What are the products of the chemical reaction of baking soda and vinegar and what is the identity of the gas
Answer:
In the reaction between vinegar and baking soda, the reactants are vinegar (acetic acid) and baking soda (sodium bicarbonate). The products are sodium acetate, water, and carbon dioxide gas.
What is the concentration in %v/v of a solution containing 3.2 L of ethanol in 6.5 L of solution?
Answer: Have a nice dAy?
Explanation: I thought i knew but nvm sorry
Given the unbalanced equation:
_C3H8(g) + _O2(g) -> _H2O(g) + _CO2(g)
When the equation is completely balanced using
smallest whole numbers, the coefficient of O2
Answer:
C3H8 + 502 ----> 3CO2 + 4H20
Explanation:
0.01 M HCl solution has a pH of 2. Suppose that during the experiment, both the universal pH indicator and the cabbage indicator turn orange-red for 0.01 M HCl. What can you conclude about the the cabbage indicator key?
A) It matches the universal pH indicator and is indicating the proper pH.
B) It should completely match the universal indicator key for all pH values greater than 7 (base).
C) It should completely match the universal indicator key for all pH values.
D) There was some sort of experimental error, because the indicators should never match.
Answer:
(A) It matches the universal pH indicator and is indicating the proper pH.
Explanation:
Correct on edge 2021
Given the data from the question, the correct statement is:
The cabbage indicator matches the universal pH indicator and is indicating the proper pH (Option A) What is pH ?This is simply a measure of the acidity / alkalinity of a solution.
The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration
pH scaleThe pH scale is a scale that gives an understanding of the variation of the acidity / alkalinity of a solution.
The scale ranges from 0 to 14 indicating:
0 to 6 indicates acid 7 indicates neutral 8 to 14 indicate basicpH indicatorsThese are devices / equipment used to indicate if a solution is acidic, neutral or basic.
From the question given above, we were told that the universal and the cabbage pH indicator gives the same result.
Therefore, we can conclude that the cabbage indicator is indicating the proper pH (Option A)
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please help due in 2 minutes
Answer:
1
Explanation:
the answer is the first option because it's at less of an incline than the others, hope this helps!
Mark the statements which are correct. A. All of the following elements are expected to gain electrons to form ions in ionic compounds: Ga, Se and Br. B. The symbols for the elements magnesium, aluminum and xenon are Mn, Al and Xe, respectively. C. The metals Co, Cu and Ti all require Roman numerals in the names of their compounds. D. The elements Co, Ni, and Hg are all transition elements.E. The elements P, As, and Bi are in the same family on the periodic table.
Answer:
The metals Co, Cu and Ti all require Roman numerals in the names of their compounds.
The elements Co, Ni, and Hg are all transition elements.
The elements P, As, and Bi are in the same family on the periodic table.
Explanation:
Transition elements are those which changes their charges as they bond with other elements or forms a compound with other elements. They show transitional behavior when they bond. Some of the transition elements are :
Chromium, Titanium, cobalt, mercury, copper, iron, vanadium, zinc, Silver, etc.
The transition elements use roman numerals in their names of the compounds.
Therefore, Cobalt (Co), Copper (Cu) and Titanium (Ti) are the elements that require a Roman numeral in the names of their compounds.
The elements Phosphorus (P), Arsenic (As) and Bismuth (Bi), they all belong to the nitrogen family of Group 15 (Va).