Answer:
9.4×10⁴J
Explanation:
The specific heat capacity (SHC) of water, which is the amount of energy (J) that it takes to warm 1mL (1mL = 1g) of water by 1°C is 4.184 J/g×°C.
Q = mcΔT relates energy to mass, SHC, and change in temperature.
The mass of water is 300g, and will not change because no water will evaporate until it reaches 100°C.
The change in temperature is 75°C:
100°C - 25°C = 75°C
(Desired temp. - initial temp. = change in temp.)
Subbing these values into Q=mcΔT:
Q = 300g × 4.184J/g×°C × 75°C
Q = 94140J
Scientific notation tells us that we have two significant figures, so:
Q = 9.4 × 10⁴J
What is the universal solvent?
A:oil
B:acid
C:water
D:hydrogen
Answer:
C: water
Explanation:
Water dissolves more substances than other liquids. That is why it is called a universal solvent.
ANSWER ASAP (20 POINTS)
There are several different models that represent compounds. One type of model is shown.
3 C's connected in a line by 2 black lines. The first and third C's each have 3 H's connected to them by a single black line each. The middle C has 2 H's connected to it by a single black line each.
What type of model is shown?
a structural formula
a chemical formula
a space-filling model
a ball-and-stick model
Answer:
a chemical formula
Explanation:
Answer:
structural formula
Explanation:
In chemical formula. Structural formulas identify the location of chemical bonds between the atoms of a molecule. A structural formula consists of symbols for the atoms connected by short lines that represent chemical bonds—one, two, or three lines standing for single, double, or triple bonds, respectively.
Name: Date:
1. According to Mike's mom, what is a cell?
A. a multicellular organism
B. the smallest unit of life
C. a type of tissue
D. a gel-like fluid
2 Von doce Mike's mom compare the cell me
Answer:
The Answer is B
Explanation:
Because a cell is the small unit of life it is the one that help us.
A cell is the smallest unit of life, performing various functions in living organisms. Cells make up tissues in the human body.
Explanation:According to Mike's mom, a cell is the smallest unit of life. It is a microscopic structure that makes up all living organisms, including plants and animals.
Cells perform various functions, such as energy production and protection. They contain different components, including a nucleus, cytoplasm, and cell membrane.
For example, in a human body, cells form different types of tissues, such as muscle tissue or nerve tissue, which have specific functions in the body.
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What do the coefficients in front of the reactants and products in a chemical reaction represent ?
The coefficients in a chemical equation represent the number of molecules or formula units of the reactants and products involved in the reaction and are crucial for ensuring the conservation of mass and for stoichiometric calculations.
Explanation:The coefficients in front of the reactants and products in a chemical reaction represent the relative numbers of molecules or formula units of those substances that participate in the reaction. When balancing chemical equations, these coefficients ensure that the equation adheres to the law of conservation of mass, meaning the number of atoms of each element is the same on both sides of the equation. For example, in the balanced equation for the combustion of methane, CH4 + 2O2 → CO2 + 2H2O, the coefficient '2' in front of O2 indicates that two molecules of oxygen are required for every molecule of methane (1CH4).
These coefficients also describe the mole ratio of reactants to products, which is essential for stoichiometric calculations in chemistry, enabling a quantitative assessment of the reaction. This quantification is necessary for applications such as determining the amounts of reactants needed or the amounts of products that will be formed in a given chemical reaction. Omitting a coefficient implies that the coefficient is '1', as in the molecule CO2 in the given equation.
For the oxidation of glucose (C6H12O6 + 602 + 6H20 + 6CO2), how many grams of
oxygen gas will be consumed when 950 g of glucose is oxidized completely?
A) 480 g
B) 571 g
C) 960 g
D) 1,013g
Answer:D. 1013 g O2
Explanation: solution attached:
Convert mass of glucose to moles
Do the mole ratio of glucose and oxygen gas based on the balanced equation
Convert moles of O2 to mass using its molar mass
what mass of aluminum hydroxide is needed to decompose in order to produce aluminum oxide and 35 L of water at STP
The mass of aluminium hydroxide is 81.12 g.
Explanation:
The chemical equation for the decomposition of Aluminium hydroxide follows:
2 Al(OH)3 ------> Al2O3 + 3H2O
At STP:
22.4 L of volume is occupied by 1 mole of a gas.
So, 35 L of the volume will be occupied by = (1 / 22.4) [tex]\times[/tex] 35 = 1.56 mol
By Stoichiometry of the reaction:
3 moles of water is produced by 2 moles of Aluminium hydroxide
So, 1.56 moles of water is produced by = (2 /3) [tex]\times[/tex] 1.56 = 1.04 mol.
To calculate the mass of Aluminium hydroxide, we use the equation:
Number of moles = given mass / molar mass
Number of moles of Aluminium hydroxide = 1.04 mol
The Molar mass of Aluminium hydroxide = 78 g/mol
Putting values in above equation, we get:
1.04 mol = mass of Aluminium hydroxide / 78
The mass of Aluminium hydroxide needed is 81.12 grams.
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опит з П. Стопс питье от гос:
7) What is the number of total subatomic particles in an atom of B-11?_
Answer:
SORRY
Explanation:
jcuxicicciigxicixgsory
Which of the following choices is and example of a capital good
Answer:
An example of a capital good is "the government will open another public school in the area".
Explanation:
A capital good or complicated products and systems or (CoPS) is a reliable commodity used in the manufacturing of goods and services. These are one of three kinds of consumer commodities, while the other two are property and labor.
The three are also commonly referred to as primary production factors.They are recorded on a company's balance sheet as assets, and can be depreciated over time. Capital goods instances include furniture, buildings, machinery, equipment and fixtures.
A capital good, like a factory building or a delivery van, is a tangible asset used by an organization to produce goods or services. It is part of the production process to provide consumer goods or services.
Explanation:A capital good is any tangible asset that an organization uses to produce goods or services that are used in the production process to provide consumer goods or services. Common examples of capital goods include buildings, machinery, equipment, vehicles, and tools. By this definition, a factory building would be a capital good as it is used by companies to manufacture products. Other examples include a delivery van used by a courier service or a wood oven used by a bakery.
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A welder has 1.873 × 102 g Fe2O3 and 94.51 g Al in his welding kit. Which reactant will he run out of first?
The welder will run out of Fe₂O₃ first. Even though the mass of aluminum is larger, the reaction requires twice as much of it, so Fe₂O₃ will be used up first.
Explanation:To determine which reactant will run out first, you must look at the stoichiometry of the chemical reaction. The relevant reaction here is the thermite reaction, which is:
Fe₂O₃+ 2Al → 2Fe + Al₂O₃
In the balanced reaction, you can see that 1 mol of Fe₂O₃ reacts with 2 mol of Al. Calculating moles from a given mass, Fe₂O₃ has approximately 0.012 mol and Al has approximately 3.5 mol.
Therefore, even though there is more mass of Al, Fe₂O₃ will run out first because the reaction requires twice as much Al as Fe₂O₃. This condition is called a limiting reactant problem in chemistry.
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What kind of energy does an unlit match have?
Answer:
Potential Energy
Explanation:
Right now, the match is giving off no energy to it's environment.
Light it.
Now it's giving off a few kinds:
Thermal energy (heat)Light energyThe match has the potential to have energy, but it currently has none.
You have a 2.0 M solution of LiF. You added 4.00 moles of LiF to a solvent to make this solution. What is the volume of this solution?
Here's a screenshot from the quiz. :)
Final answer:
The volume of a 2.0 M solution of LiF when 4.00 moles of LiF are added is 2.00 liters, calculated by dividing the moles of solute by the molarity.
Explanation:
To calculate the volume of a 2.0 M solution of LiF when you have added 4.00 moles of LiF, you can use the formula for molarity (M), which is moles of solute divided by liters of solution. Thus, the volume V (in liters) can be found using the equation M = moles of solute / V. When you rearrange the formula to find V, it becomes V = moles of solute / M.
Using the given values, the volume V of the LiF solution is:
V = 4.00 moles of LiF / 2.0 M
V = 2.00 liters
separation of mixture by gravity of sodium carbonat into calcium chloride
By combining aqueous solutions of calcium chloride and sodium carbonate, a solid calcium carbonate is produced. The CaCO 3 is trapped by the paper which forms as a precipitate, but the NaCl passes through the filter paper with the water.
Explanation:
In gravity separation, a combination of two incompatible liquids can be separated by using a separating funnel. The operation is based on the variation within the density of the liquids. The heavier liquid that settles down is drained out first from the funnel into the beaker, and then the lighter liquid is drained out into another beaker. Filtration is used to separate a substance from a mixture because one is insoluble and the other is soluble. By combining aqueous solutions of calcium chloride and sodium carbonate, solid calcium carbonate is produced.CaCl 2 (aq) + Na 2 CO 3 (aq) → CaCO 3 (s) + 2NaCl(aq)
A filter paper is inserted in a funnel and the mixture may be poured through a funnel. The NaCl is passed through the filter paper with the water but CaCO3 is trapped by the paper which forms the precipitate.if lance armstrong is riding his bicycle at speeds of 15 m/s, how long will it take him to travel 81.9 meters?
Answer:
5.46
Explanation:
Answer: 5.46
Explanation:
Consider the chemical reaction represented below
N2 + 02 - Heat - 2NO
Which of the following statements about this reaction is true?
A. The reaction requires water to take place.
B. Oxygen is produced by the reaction
C. The reaction releases hea
D. Heat is absorbed by the reaction
Answer:
D
Explanation:
Answer:
heat is absorbed by the reaction
Explanation:
A car moved 20 km east and 60 km west. What is it’s average velocity?
Answer:
60-20=40km west because the direction Will favour whichever direction is bigger
Final answer:
The average velocity of the car is the total displacement divided by time, which is 40 km to the west, direction included as velocity is a vector quantity.
Explanation:
The question asks for the average velocity of a car that has moved 20 km east and then 60 km west. To calculate the average velocity, we need to find the total displacement divided by the total time taken. However, the time is not given, so we assume the question seeks the average velocity in terms of displacement.
Since velocity is a vector quantity, it takes into account both magnitude and direction. The car's total displacement is the sum of the individual displacements taking direction into account: 20 km east (which we can denote as +20 km) and 60 km west (denoted as -60 km). Therefore, the total displacement is -40 km (20 km - 60 km), indicating a net displacement of 40 km to the west.
If we were given a time interval, we could divide the total displacement by this time to find the average velocity. However, since time is not provided, the average velocity in terms of displacement is simply -40 km divided by the given time. We need to include the direction in our answer, which is west in this case.
D
Question 3
Ca(OH)2
Strong electrolyte
Weak electrolyte
Nonelectrolyte
Previous
Strong electrolyte
hope this helps
Calcium hydroxide, Ca(OH)2, is classified as a strong electrolyte because it fully dissociates into ions when dissolved in water, despite its low solubility.
Explanation:The question asks to classify Ca(OH)2 as a strong electrolyte, weak electrolyte, or nonelectrolyte. Calcium hydroxide, Ca(OH)2, is considered a strong electrolyte because when it dissolves in water, it dissociates completely into calcium ions (Ca²⁺) and hydroxide ions (OH⁻). Even though the solubility of Ca(OH)2 is relatively low, the portion that does dissolve dissociates 100% into ions, allowing it to conduct electricity well.
6. Round each of the following numbers to three significant figures:
(a) 93.246 -------
(C) 4.644 ---------
(b) 0.02857-
(d) 34.250 --
what controls the rate of movement of groundwater? PLZ HELP
Answer:
Groundwater flow rates are controlled by the permeability of the aquifer through which the water is flowing and by the local hydraulic gradient (the drop in hydraulic head per unit distance; equal to the slope of the water table for unconfined aquifers).
Explanation:
I hope that helps you
predict the formula of magnesium argonide
Answer:The formula of magnesium argonide is H2MgO
Explanation:
Answer:
H2MgO that is the answer. have a nice day.
What is the molality of a solution that contains 1.34 moles of NaCl in 2.47 kg of solvent
The molality is 0.54 M when 1.34 moles of NaCl is present in 2.47 kg of solvent.
Explanation:
Molality is the measure of how much of amount of solute is dissolved in the solvent. So it is calculated as the ratio of moles of solute to the grams of solvent.
[tex]\text {Molality}=\frac{\text {Moles of solute}}{\text {Mass of solvent}}[/tex]
As in this case, the solute is NaCl and solvent is unknown. So the moles of solute is given as 1.34 moles and the mass of solvent is given as 2.47 kg.
Hence, [tex]\text { molality }=\frac{1.34}{2.47}= 0.54 \mathrm{M}[/tex]
Thus, the molality is 0.54 M when 1.34 moles of NaCl is present in 2.47 kg of solvent.
The molality of a solution containing 1.34 moles of NaCl in 2.47 kg of solvent is calculated by dividing the moles of NaCl by the kilograms of solvent, resulting in approximately 0.5425 moles per kilogram.
Explanation:The molality of a solution is defined as the number of moles of solute per kilogram of solvent. In this case, we are asked to calculate the molality of a solution containing 1.34 moles of NaCl dissolved in 2.47 kg of solvent. To find the molality, we just need to divide the moles of solute by the kilograms of solvent.
The calculation would be:
Write down the molality equation: molality (m) = moles of solute / mass of solvent in kg.
Insert the given values into the equation: m = 1.34 moles NaCl / 2.47 kg solvent.
Calculate the result: m = (1.34 moles) / (2.47 kg) = approx. 0.5425 moles/kg. This is the molality of the NaCl solution.
Which situation is an example of heat transfer by radiation?
The sun's energy is transferred through the vacuum of space to Earth.
Hot soup rises to the top of the bowl, while cooler soup sinks to the bottom.
An ice cube melts while you hold it in your hand.
Coastal temperatures are cooler than temperatures in inland areas.
Answer:
the correct answer would be A.
Explanation:
How many moles are in 5.25 L of oxygen gas as stp
Answer:
The correct answer is 0, 235 mol
Explanation:
We use the formula PV =nRT. The normal conditions of temperature and pressure are 273K and 1 atm, we use the gas constant = 0, 082 l atm / K mol:
1 atm x 5, 25l = n x 0, 082 l atm / K mol x 273 K
n= 1 atm x 5, 25l /0, 082 l atm / K mol x 273 K
n= 0, 235 mol
To calculate the number of moles of oxygen gas in 5.25 L at STP, divide the volume by the molar volume of a gas at STP, which is 22.4 L/mol. This results in approximately 0.2344 moles of oxygen gas.
Explanation:The student is asking about the number of moles of oxygen gas in 5.25 liters at standard temperature and pressure (STP). To find this, we use the concept of molar volume which states that one mole of any gas at STP occupies 22.4 liters.
We can set up a conversion factor to calculate moles from volume:
5.25 L O2 × (1 mol / 22.4 L)Dividing 5.25 liters by 22.4 liters per mole gives us:
5.25 L / 22.4 L/mol ≈ 0.2344 moles of O2
_______is the thermal energy that flows from one substance to another when the substances differ in temperature.
Answer:
Heat
Explanation:
See above for the answer
nswer:
Heat
Explanation:
Heat is a form of energy (thermal energy) in transition, which is transferred by non-mechanical means due to a temperature difference.
Heat always flows from the higher temperature system to the lower temperature system.
Its nature is transitory, so it makes no sense to speak of heat stored in a system, but of heat flowing from one system or substance to another given a temperature difference.
If there is no difference in temperature, no heat will flow between systems or substances.
When an experiment is repeated and the new results are different from the original results, what could you assume to be true?
A) The experiment is flawed and must be redesigned.
B) The results from the second experiment can be ignored.
C) Both sets of results may be inaccurate for a variety of reasons. D) There is nothing wrong with either results, they are both accurate.
Answer:
C since however many times you repeat an experiment, it should give the exact same results or it wouldn't be accurate enough. ex if you measure a liquid to be 77ml in USA, it should give the same when measured in Germany, same with repeating experiments.
Different results from an experiment's repetition could be due to several reasons, such as changes in conditions, measurement errors, or random variations, and do not necessarily mean the experiment is flawed or a set of results should be ignored. Both sets of results should be compared to determine potential differences.
Explanation:When an experiment is repeated and the new results are different from the original results, it's safe to assume that both sets of results may be inaccurate for a variety of reasons (Option C). This does not necessarily imply that the experiment is flawed and must be redesigned, nor that the results from the second experiment should be ignored.
In science, reproducibility and consistency are key. There could be various factors leading to differing results, such as changes in conditions, measurement errors, or random variations. It is crucial to carefully review both sets of experimental results and determine if any variables or factors might have considerably altered between the experiments. In some cases, multiple repeats of the experiment may be required to arrive at a consistent result.
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1. the process of cell division that forms two nuclei
2. the life stage of a cell
3. pairs of similar chromosomes
4. the structure in which DNA the hereditary material that controls cell activities can be found
5. the division of cytoplasm
a. cytokinesis
b.chromosome
c.cell cycle
d.mitosis
e. homologous chromosomes
which letter goes with which number? ❤️❤️
1. D
2. C
3. E
4. B
5. A
hope this helps
Today's chemistry experiment requires you to find the formula for a hydrate. You will be heating copper (II) sulfate to determine how many moles of water are attached to the copper (II) sulfate crystals. This involves the physical change of driving the water molecules out of the crystals. Which piece of equipment are you most likely to use?
A)
crucible
B)
Erlenmeyer flask
C)
evaporating dish
(WILL GIVE BRAINLIEST TO THE FIRST CORRECT ANSWER!)
Answer:
c
Explanation:
Answer:
c
Explanation:
How much energy is required to raise the temperature of 3 kg of aluminum
from 18°C to 23°C? Use the table below and this equation: Q = mcAT.
Substance Specific Heat Capacity (1/(°C))
Liquid water
4.186
Ice
2.11
Air
1.00
Aluminum
0.897
Soil
0.80
Granite
0.790
Iron
0.450
Copper
0.385
Silver
0.233
Lead
0.129
O
A. 13,455 J
O
O
B. 2691 J
C. 13,455 J
OD. 4.485 J
Answer:
Explanation:
Q = mcAT= should be mc(T2-T1)
for Aluminum
Q = 3 1000g Al x(0.897J/gC x(23-18 C)= 16722 J
The correct answer is 13,455
The energy required to raise the temperature is :-[tex]Q=mc[/tex]Δ[tex]T[/tex]
[tex]Q=3*1000*0.897*(23-18)[/tex] [tex]Q=3000*0.897*5\\Q=3*897*5\\Q=13,455[/tex]What is meant specific heat?
Specific heat, the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree.
Does Aluminium have a high specific heat?
Aluminum also has a higher specific heat capacity, it takes more energy to raise a unit mass of aluminum by one degree Celsius than iron.
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can someone please explain how to do number 11?
Answer:
HBr + Mg(OH)2 —> MgBr2 + H2O.
To balance the above, we must do a head count of the individual atoms present to ensure they balance on both sides of the equation. To get the balance equation, add 2 in front of HBr and 2 in front of H2O as shown below:
2HBr + Mg(OH)2 —> MgBr2 + 2H2O
We can see clearly that the numbers of the individual atoms on the left side is the same on the right side
2H2 + O2 --> 2H2O
How many grams of oxygen gas are required to produce 90. g of water?
Answer:
80g
Explanation:
2H2 + O2 —> 2H2O
MM of H2O = (2x1) + 16 = 2 + 16 = 18g/mol
Mass conc. of H2O from the balanced equation = 2 x 18 = 36g
MM of O2 = 16 x 2 = 32g/mol
From the equation,
32g of O2 reacted to produce 36g of H2O.
Therefore Xg of O2 will react to produce 90g of H2O i.e
Xg of O2 = (32x90)/36 = 80g
An unsaturated alkene or alkene is a result from a loss of hydrogen atoms true or false
Answer:
True
Explanation:
Hydrocarbons are classified in to Unsaturated and Saturated classes.
Saturated Compounds:
These are those organic compounds which has only single bonds between the carbon atoms. For example, Alkane are the saturated compounds. The Carbon atom in these compounds are Sp³ hybridized and the geometry along carbon atom is tetrahedral.
Unsaturated Compounds:
These are those organic compounds which has either a double bond (alkenes) or triple bonds (alkynes) between the carbon atoms. The Carbon atom in alkenes is Sp² hybridized and the geometry along carbon atom is triangular while, The Carbon atom in alkynes is Sp hybridized and the geometry along carbon atom is linear.
The reaction in which alkanes (saturated) compounds are converted into alkenes are called as dehydrogenation reactions while, the reactions in which the unsaturated compounds (alkene and alkyne) are converted into saturated compounds are called as hydrogenation or reduction reactions. Hence, we can conclude that the dehydrogenation of alkanes results in the formation of unsaturated compounds.
Answer:true
Explanation: alkenes has a double bond