. What is the independent variable? (what scientist changes or makes different)Cory wants to see which cup will keep his coffee hottest. He usually drinks coffee out of a Styrofoam cup but decides to compare it to 3 different types of cups. Cory puts 250 ml of his favorite coffee at 95 degrees Celsius into a Styrofoam cup, a plastic cup, a glass cup, and a paper cup. He measures the temperature change of the coffee after 10 minutes.
Answers
Answer: the type of cup
Explanation: the independent variable is what you change in your experiment, to find out the different results, in this experiment the factor that they are changing in order to see which outcome is best, is the type of cup.
Related Questions
20 POINTS! SAVE ME PLS!!!
What is an easy way to determine the amount of valence electrons that an element will have?
A. The valence electrons are the same as the period number.
B. The valence electrons are the same as the atomic number.
C. The valence electrons are the same as the 1's place of the group number.
D. All of the above.
Answers
Answer:
A. it is A. i am 80% sure it is A,
Explanation:
1. How did the enzyme amylase affect the digestion of the cracker in Part 1? How do these results correlate with where this enzyme occurs in the human body? B U T 0 Word(s) T
Answers
The pH of the solution or enzyme amylase affect is directly affected by fat digestion. Set has a neutral PH, but when fats are digested by lipase, they are converted into fatty acids. The presence of fatty acids can either decrease or stimulate the pH, resulting in an increase in the acidity of the solution. PATHWAY - Fat Digestion - Produre, - Fatty Acid Alkali Sodium Carbonate Increasing the pH
The enzyme alpha-amylase is in charge of digesting or breaking down starch. Crackers are a type of food that contains a lot of starch. When the salivary glands release starch, alpha-amylase begins digesting it in the mouth. It degrades starch into smaller chains of two or three glucose molecules.Proteins are enzymes that aid inside the speeding up of digestion, or the synthetic reactions that take place in our carcasses. Some substances are formed whereas others are broken. Enzymes are present in all living items. Enzymes are produced naturally by in out bodies. However, enzymes may also be found in factory - made products and food. Pepsin, for example, is an integral part of gastric secretions that aids in the breakdown of bits of food in the stomach. Similarly, the pancreatic amylase, which is found in saliva, gets converted starch into carbohydrates, which aids in digestion. The enzyme thrombin is used in medicine to promote wound healing.
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what type of reacion is NO2 + H2O → HNO3
Answers
Answer:
acid base reaction cuz no is base and h2o is none and hno3
Which describes bedrock?
consists of solid rock
lies directly above the soil layer
does not contain weathered rock
forms from decomposed material
Answers
Answer:
1.Consists of solid rock
Explanation:
Answer:
The answer would be A. Consists of solid rock
An early arrangement of the then known elements was proposed by a British scientist John Newlands, which he called the Law of Octaves. Like other scientists at the time, Newlands arranged the elements in order of increasing atomic mass and noted that every eighth element had similar physical/chemical properties. In the modern Periodic Table, which of the following represents the last pair of elements for which Newlands' Law of Octaves would hold true?
Answers
What is the equation to find volume?
1. mx+b
2. wxh
3. bxh/2
4. LxWxH
Answers
Answer:
Option 4
Explanation:
Volume of any substance is the space occupied by it.
For cuboidal objects the volume is equal to the product of length, weight and height.
Hence, mathematically volume can be written as
\(V = L * W * H\)
Thus, option 4 is correct
Cold-winter survival experts do not recommend eating snow for hydration. One reason for this is the energy it takes to increase temperature of the snow, melt it, and then increase the temperature of the resulting water to body temperature. Calculate the total amount of heat to convert 2.000 kg of snow at -15.00 0C to liquid water at 38.00 0C.
POTENTIALLY HELPFUL INFORMATION:
The heat of fusion for water is 1.44 kcal/mol.
The specific heat capacity of solid water is 0.488 cal/g0C.
The specific heat capacity of liquid water is 1.00 cal/g0C.
The freezing point of water is 00C (also known as melting point).
Answers
Answer:
The total amount of heat is 250.64 kcal.
Explanation:
Given that,
Total amount of heat = 2.000 kg
Temperature of snow = -15.00°C
Temperature of water = 38.00°C
Heat of fusion of water = 1.44 kcal/mol
Specific heat of solid water = 0.488 cal/g°C
Specific heat of liquid = 1.00 cal/g°C
We need to calculate the heat required to bring temperature -15°C to 0°C snow
Using formula of heat
\(Q_{1}=mc_{p}\Delta T\)
Put the value into the formula
\(Q_{1}=2000\times0.488\times(0+15)\)
\(Q_{1}=14640\ cal\)
\(Q_{1}=14.640\ kcal\)
We need to calculate the heat required to convert 0°C snow into 0°C water
Using formula of heat
\(Q_{2}=ml\)
Put the value into the formula
\(Q_{2}=\dfrac{2000}{18}\times1.44\)
\(Q_{2}=160\ kcal\)
We need to calculate heat required to increases temperature of water from 0°C to 38°C
Using formula of heat
\(Q_{3}=mc_{p}\Delta T\)
Put the value into the formula
\(Q_{3}=2000\times1.00\times(38-0)\)
\(Q_{3}=76000\ cal\)
\(Q_{3}=76\ kcal\)
We need to calculate the total heat
Using all heat amount
\(Q=Q_{1}+Q_{2}+Q_{3}\)
Put the value into the formula
\(Q=14.640+160+76\)
\(Q=250.64\ kcal\)
Hence, The total amount of heat is 250.64 kcal.
i have a picture of question
Answers
The mass of the cereal that you would need to consume can be obtained as 84.8 g
What is the number of moles?The number of moles, denoted by the symbol "n," is a fundamental unit of measurement in chemistry that represents the amount of a substance. It is used to quantify the quantity of atoms, molecules, or ions in a sample.
Number of moles of sucrose in the cereal = 11g/342 g/mol
= 0.03 moles
Now;
0.03 moles of sucrose is contained in 60 g of cereal
0.0424 moles of sucrose would contain 0.0424 moles * 60 g/0.03 moles
= 84.8 g
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A beaker of cold water is placed in a hot water bath at 90°C.Explain what happens in terms of heat diffusion.
Answers
Explanation: heat is transferred from the hot water to the cold water until they reach the same temperature
When zinc reacts with copper sulfate solution, zinc sulfate solution and copper are formed.(i) An experiment was carried out to measure the temperature change when zinc powder reactswith copper sulfate solution.initial temperature of copper sulfate solution = 20 °Cfinal temperature of mixture after the reaction = 46 °CExplain what the temperature readings show about the type of heat change that occurs duringthis reaction.
Answers
The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.
In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.
The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.
During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.
The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.
The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.
In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.
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an old gas station, gasoline leaks from an underground storage tank.
classification:
explanation:
Answers
Regular maintenance inspections and the replacement of damaged underground tanks are necessary to prevent gasoline leaks.
What causes gasoline leak?When tanks are damaged and rusted or if pipelines and connection points are poorly fitted, gasoline leaks might occur.A major environmental risk as well as a harm to people and property are posed by gasoline leaks.Leaks of gasoline can start fires that endanger lives and destroy property.Additionally, gasoline leaks can contaminate land, water, and soil, destroying vital aquatic and soil creatures.In our house, gasoline spills are quite frequent. Due to the higher likelihood that they will start a fire, explosion, or even carbon monoxide poisoning, they can be extremely deadly.Therefore, gasoline leaks can be avoided by performing routine maintenance checks and replacing damaged underground tanks.
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Polycarbonate plastic has a density of 1.2
g/cm3. A photo frame is constructed from
two 5.2 mm sheets of polycarbonate. Each
sheet measures 22 cm by 20 cm.
What is the mass of the photo frame?
Answers
The mass of the photo frame : = 549.12 g
Further explanationGiven
a photo frame
two 5.2 mm sheets = 0.52 cm
22 cm by 20 cm dimension
Required
the mass
Solution
The volume of one sheet = l x w x h
= 22 cm x 20 cm x 0.52 cm
= 228.8 cm³
Mass of one sheet :
= density x volume
= 1.2 g/cm³ x 228.8 cm³
= 274.56 g
So for two sheets of polycarbonate :
= 2 x 274.56 g
= 549.12 g
A reaction starts with 20.0 g of lithium hydroxide (LiOH) and actually produces 31.0 g of lithium chloride (LiCl), what is the percent yield? (Hint: First calculate the theoretical yield of lithium chloride (LiCl))
64.5%
88.6%
81.5%
92.8%
Answers
Answer:
87.6 %
Explanation:
Step 1: Write the balanced equation
LiOH + KCl ⇒ LiCl + KOH
Step 2: Calculate the theoretical yield of LiCl
We will use the following relations:
The molar mass of LiOH is 23.95 g/mol.The molar ratio of LiOH to LiCl is 1:1.The molar mass of LiCl is 42.39 g/mol.The theoretical yield of LiCl from 20.0 g of LiOH is:
\(20.0gLiOH \times \frac{1molLiOH}{23.95gLiOH} \times \frac{1molLiCl}{1molLiOH} \times \frac{42.39gLiCl}{1molLiCl} = 35.4gLiCl\)
Step 3: Calculate the percent yield of LiCl.
We will use the following expression.
\(\%yield = \frac{real\ yield}{theoretical\ yield} \times 100\% = \frac{31.0g}{35.4g} \times 100\% = 87.6 \%\)
Answer:
88.6%
Explanation:
Hello,
In this case, considering the given reaction, we notice a 1:1 molar relationship between lithium hydroxide (molar mass=23.95 g/mol) and lithium chloride (molar mass=42.394 g/mol), for that reason, we are able to compute the theoretical yield of lithium chloride by stoichiometry:
\(m_{LiCl}^{theoretical}=20.0gLiOH*\frac{1molLiOH}{23.95gLiOH}*\frac{1molLiCl}{1molLiOH} *\frac{42.394 gLiCl}{1molLiCl}=35.4gLiCl\)
Next, by knowing the actual yield of 31.0 g, we compute the percent yield as:
\(Y=\frac{m_{LiCl}^{actual}}{m_{LiCl}^{theoretical}} *100\%=\frac{31.0g}{35.4g}*100\%\\ \\Y=87.6\%\)
Therefore, among the given, the answer should be 88.6%
Best regards.
What is the half-life when the initial concentration is 0.52 M ?
Answers
The half-life of a reaction when the initial concentration is 0.52 M is equal to the half-life of the reaction in general.
What is the reaction ?The reaction to a particular event or situation can vary greatly depending on the individual. Generally speaking, a reaction is an emotional, mental, or physical response to a stimulus. It could be anything from a feeling of fear or surprise to a physical response such as a smile or a laugh. People may also react differently to the same stimulus, based on their personal experiences or beliefs. For example, a person who is exposed to a large, loud noise may respond with fear, while another person may respond with excitement. Reactions can also be unpredictable and highly subjective.
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plsssss help!!! Deep Space 1 was a spacecraft powered by an engine that gave off xenon particles to change velocity. It had a mass of 500 kg. Which expression can be used to find the spacecraft’s acceleration if its engine created a net force of 0.10 N? A) 0.10 N 500 kg B) 500 kg · 0.10 N C) 500 kg 0.10 N D) 500 kg + 0.10 N
Answers
Answer:
Spacecraft’s acceleration (a) = 0.10 N / 500 kg
Explanation:
Given:
Mass of Spacecraft (M) = 500 Kg
Force generate by engine (F) = 0.10 N
Find:
Spacecraft’s acceleration (a)
Computation:
F = Ma
0.10 = 500 (a)
a = 0.10 / 500
Spacecraft’s acceleration (a) = 0.10 N / 500 kg
The expression which can be used to find the spacecraft’s acceleration if its engine created a net force of 0.10 N is 0.10 N/500Kg.
We know that force is the product of the mass a body and its acceleration. The result of motion is the action of an unbalanced force. We have the following information;
Mass of the spacecraft = 500 kg
Force on the engine = 0.10 N
From Newton's law;
F = ma
F = force
m = mass
a = acceleration
a = F/m
acceleration = 0.10 N/500Kg
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just letting you get points if you want them :-)
Answers
Answer:
i love ur pfp lol
Explanation:
A gas has a volume of 543 ml. at a temperature of 75.0°C. What volume will the gas occupy at 20.2°C?
Answers
Answer:
V₂ = 457.49 mL
Explanation:
Given that,
Initial volume, \(V_1=543\ mL\)
Initial temperature, \(T_1=75^{\circ} C=75+273=348\ K\)
Final temperature, \(T_2=20.2^{\circ} C=20.2+273=293.2\ K\)
We need to find the final volume of the gas. The relation between the volume and the temperature of the gas is given by :
\(\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\)
Put the respected values,
\(V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{543\times 293.2}{348}\\\\V_2=457.49\ mL\)
So, the final volume of the gas is equal to 457.49 mL.
Distinguish between the order and the molecularity of a reaction
Answers
The order of a reaction is determined experimentally and describes the relationship between the rate of a reaction and the concentration of reactants, whereas the molecularity of a reaction is a theoretical concept that describes the number of molecules that participate in the rate-determining step of a reaction.
The order of a reaction is the mathematical representation of the relationship between the rate of a reaction and the concentration of reactants. It describes how the rate of a reaction changes with respect to the change in concentration of reactants.
The order of a reaction is determined experimentally by observing how the rate of a reaction changes as the concentration of reactants is varied while keeping the concentration of other reactants and conditions constant. The order of a reaction can be 0, 1, 2, or even a fraction.
The molecularity of a reaction is the number of reactant molecules that collide in a single step to form the product. The molecularity of a reaction can be unimolecular (1), bimolecular (2), or termolecular (3). It is important to note that not all reactions have a molecularity, as some reactions have multiple steps and multiple reactants involved.
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What ideas do you have about why Christchurch’s air temperature is cooler during el niño years?
Answers
One possible reason for cooler air temperatures in Christchurch during El Niño years is the shift in atmospheric circulation patterns.
During El Niño years, Christchurch may experience cooler air temperatures due to several factors associated with the El Niño phenomenon.
El Niño is characterized by the abnormal warming of the surface waters in the eastern tropical Pacific Ocean, which has global climatic implications. While El Niño is primarily associated with changes in oceanic conditions, its effects can extend to atmospheric patterns, leading to altered weather patterns and temperature variations.
One possible reason for cooler air temperatures in Christchurch during El Niño years is the shift in atmospheric circulation patterns. El Niño can disrupt the normal global atmospheric circulation, resulting in changes in the positioning and intensity of weather systems.
This can lead to the advection of cooler air masses from the south or southeast towards Christchurch, resulting in cooler temperatures.
Another factor is the influence of El Niño on regional rainfall patterns. El Niño often leads to drier conditions in the South Island of New Zealand, including Christchurch.
Reduced cloud cover and less moisture in the air can contribute to cooler temperatures as there is less insulation from the sun's radiation and less evaporative cooling. Additionally, the absence of significant rainfall can result in less moisture in the soil, leading to cooler conditions as less energy is used for evaporation.
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David Robinson, a professional basketball
player, is 7 ft, 1.0 in. tall. Convert his height to
centimeters
Show work please
Answers
Answer:
215.9 cm
Explanation:
1 foot= 30.5cm
30.5cm times 7 1/12=215.9cm
The given height of David is 7 ft, 1.0 inch, so in centimeters, the height will be 216.4 cm.
What is unit conversion?A conversion factor is a number that is used to multiply or divide one set of units into another. When converting to an equal value, the appropriate conversion factor must be used.
We must convert one unit to another in order to achieve accuracy and avoid measurement confusion.
We do not, for example, measure the length of a pencil in kilometers. In this case, one must convert kilometers (km) to centimeters (cm) (cm).
To convert feet to centimeters, multiply the given foot length by 30.48 cm.
So,
Height in cm will be = 7.1 x 30.48
Height in cm = 216.4cm
Thus, the height of David in centimeters is 216.4 cm.
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How do you define an anion?
Answers
An anion has more electrons than protons, it is a negatively charged ion.
Answer:
a negatively charged ion, as one attracted to the anode in electrolysis. any negatively charged atom or group of atoms (opposed to cation).
Explanation:
this is what i found hope iit helps
A 65.00 gram piece of Aluminum is heated to 80.0 °C. It is then placed in 135.00 mL of 26.00 °C water. The final temperature of the water with the metal in it is 31.0 °C. What is the specific heat of the aluminum?
Answers
According to specific heat capacity, the specific heat of the aluminum is 0.807 J/gK .
Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.
It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.
It is given by the formula ,
Q=mcΔT in case of 2 substances, aluminium and water it is m₁c₁ΔT₁=m₂c₂ΔT₂, thus, c₁= 135×4.2×5/13×54=0.807
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The change in enthalpy that occurs in the process of converting reactants to products in a chemical reaction is called the _____ of reaction.
Answers
Answer:
∆H or Enthalpy of the reaction
Explanation:
If ∆H is +ve
Reaction is exothermicExample:-Combustion, mixing sodium/potassium in waterIf ∆H is -ve
Reaction is endothermicEx:-Melting of iceMatter is anything that has mass. What is the smallest unit of matter known as?
Atom
Liquid
Proton
Nucleus
Answers
Answer:
Atom
Explanation:
Its the smallest unit into which matter can be divided without the release of electrically charged particles.
Which statement provides the best evidence that in environmental change can affect traits in later generations of an organisms population?
A- The number of plankton begin to decrease as the pH of ocean water decreases .
B- above average rainfall causes the number of lichens growing in a forest to increase.
C-A type of plant that had rarely been observed in a particular habitat suddenly produces more offspring as winter becomes milder .
D-after a dry periods lasting many years only a few individuals of a tree population survive and then produce drought tolerant offspring.
Answers
Answer:
D-after a dry periods lasting many years only a few individuals of a tree population survive and then produce drought tolerant offspring.
Explanation:
Are class just discussed this question, this is the correct answer.
Th best evidence that in environmental change can affect traits is;
after a dry periods lasting many years only a few individuals of a tree population survive and then produce drought tolerant offspring, option D.What are factors that affect traits?Triats are characteristic or features possessed by organisms which determines their functions and abilities.
Trauts are affected by:
genesenvironment nutritionAn example of how envrionmental changes affects traits is that after a dry periods lasting many years only a few individuals of a tree population survive and then produce drought tolerant offspring.
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4. How many particles are in one mole of a substance?
a. 0 6.626 x 10-34
b. 6.02 x 1023
c. Depends on the element
d. 1
Answers
Substances A-D have the following specific heats (J/g-C):
A = 0.90, B = 1.70, C = 2.70, D = 4.18.
Which substance will cool the fastest when equal masses are heated to the same temperature?
O substance A
O substance B
O substance C
O substance D
Help please.
Answers
The least specific heat is possessed by substance A (0.90 J/g-C). Since equal masses of all the substances are heated to the same temperature, material A will therefore cool the fastest.
What does a substance's specific heat mean?Also known as specific heat, this is the amount of energy required to increase a substance's temperature by one degree Celsius in one gramme. The units of specific heat are typically calories or joules per gramme per degree Celsius. For instance, water has a specific heat of 1 calorie per gramme per degree Celsius.
What is the water's specific heat in J gC?According to its 4.186 J/g°C specific heat capacity, water needs 4.186 J of energy (or 1 calorie) to heat a gramme by 1 degree.
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Is water a good solvent choice for recrystallization of NaCl?
Answers
Answer:
Water is not a good solvent choice.
Explanation:
While water is good solvent because of its polotiry. Water is not good for the recrystallization process becuase being a good recystallization solvent means that a compound must dissolves easily when the solvent is warm, but that is less soluble at room temperature or when cooled in an ice bath. Water has the dissolves when warm part down. But for the cooled part which is the most important it can not do.
Water is not a good solvent for recrystallization of sodium chloride.
What are the properties of sodium chloride ?Sodium chloride or salts present in oceans and sea waters and it is also called as rock salt present in crystalline solid form, white, present in aqueous form.
It is water-soluble, consists of sodium cation and chloride anion present in a combined form in 1:1 ratio, also used in the food industry.
It is partially soluble or insoluble in liquids, a good conductor of electricity because of free movement of the ions, melting point of 801°C and a boiling point of 1,413°C.
It is used in medicine industry like in Saline solution as nasal spray, used in fire extinguishers, as a cleansers like shampoo, and toothpaste, soda ash industry which produce sodium carbonate through the Solvay process.
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Mention three careers that have to do with STEM. Use complete sentences when you answer.
Answers
Statistician.
Software developer.
Physician assistant.
Dentist.
Cartographer.
Actuary.
Civil Engineer.
Psychologist.
All of these are examples of things that produce light energy except.
a. candle
b.flashlight
cDesklamp
d.compass
Answers
Answer:
Explanation:
A compass. Its main purpose is to tell what direction you are travelling.