A student conducted an investigation to determine the effect of water temperature on the amount of sugar that dissolves in a beaker of water. Identify components for trial 1 of this investigation.

Answer:

I think it's D

sorry if I'm wrong.

Explanation:

Options that are not characteristics of compound in the question is D. different samples have different properties.

Some of the properties of a compound are;

Therefore, option D is correct because a compound will only has its own properties not that

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Answer:

coverwow customer care number 8388026087//8388026087

Answer:

Li2CO3+CaCl2=CaCO3+LiCl

the formula below for the application of KVL around i1 is KVL around loop i1: -10V + 5Ω * (I1 - I2) + 10Ω * I1 = 0.

According to Kirchhoff's Voltage Law (KVL), the sum of the voltages around a closed loop in a circuit is equal to zero. In this case, we are applying KVL around loop i1. The equation represents the sum of voltage drops in the loop, where -10V is a voltage source, 5Ω * (I1 - I2) represents the voltage drop across the 5Ω resistor due to the difference in mesh currents I1 and I2, and 10Ω * I1 represents the voltage drop across the 10Ω resistor due to the current I1. The equation is set equal to zero to satisfy KVL.

ii. KVL around loop i2: 10Ω * I2 - 5Ω * (I1 - I2) + 2V = 0

Similar to i, this equation represents the application of KVL around loop i2. The 10Ω * I2 term represents the voltage drop across the 10Ω resistor due to the current I2, the -5Ω * (I1 - I2) term represents the voltage drop across the 5Ω resistor due to the difference in mesh currents I1 and I2, and the 2V term represents a voltage source. The equation is set equal to zero to satisfy KVL.

iii. Determine the current i1: Substitute the obtained values into the equation for i1 and solve for I1 in mA.

iv. Determine the current i2: Substitute the obtained values into the equation for i2 and solve for I2 in mA.

v. Determine Vo: Substitute the obtained values for i1 and i2 into the appropriate equation representing the voltage at Vo, and calculate the value in V.

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Answer: Three samples that can be used to test for poisons are blood samples, hair samples, and gastric contents samples.

Advantages of hair samples area is that it can indicate past exposure to toxins or poisons and also provide information on how long the exposure has been going on. Poisons can sometimes be detected in hair for long periods of time. The advantages of gastric contents samples area is it shows whether the poison was digested or not. An advantage of blood samples is that it’s the most useful toxicological samples. The disadvantage of hair samples is that the results can be tainted by external sources. The disadvantage of gastric content samples is that it doesn’t always show which toxin was digested. The disadvantage of blood samples is if taken near or from the heart it may have artificially high levels of toxins that wouldn’t reflect the amount distributed throughout the body at the time of death.

Explanation:

The three sample we can use to test the poison intaken to the body are blood, urine and saliva. These samples can be used to identify the type o poison but the time of ingestion and toxicity cannot be accurately studied sometimes.

The use of some chemicals or indirect exposure to them sometimes causes poison inside our body. It can be tested using samples such as blood, saliva, urine, hair etc.

Blood is the first specimen that is usually collected to detect the concentration of toxicants in the bloodstream. It does not only help in determining the quantity of poison taken but also in estimating the effects of the poison and the time of death.

Urine also used to test poison inside. However it cannot tell much about the dose of ingestion. Hair samples are primarily used to detect poisons and it greatly helps to find the concentration.

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Answer:

Reflection takes place from the polished smooth surfaces

Explanation:

A vacuum does not refer to an opaque body. An opaque body does not allow light to pass through it while a vacuum is simply empty space without air.

A smooth polished surface often acts as a mirror, it is a good reflector of light.

The moon is a non luminous body in the sky. It merely reflects the light from the sun.

A Pinhole camera can not take pictures of moving objects because it only focuses on any image placed before it.

Shadows are not inverted, the always appear upright.

1. The process is endothermic.

2. The products have more energy than the reactants have.

4. The process is exothermic.

5. The products have more energy than the reactants have.

An exothermic reaction is a chemical process that transfers heat energy into the environment. In an exothermic process, the total energy of the reactants is higher than the total energy of the products. The additional energy results in the production of heat. An increase in the temperature of the immediate environment is typically a sign of exothermic reactions.

An endothermic reaction is a chemical process that absorbs heat energy from the surroundings. the sum of the products' energies in an endothermic reaction.

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1 — Element D and A ( Which are Sodium and aluminium )

2 — ( 2 + 8 + 3 = 13 electrons total ) Element A Because it's atomic number is 13.

3 — Element E Is stable. ( Which is Argon )

( Note, Elements which has 8 election on its outermost cell is stable. ( Helium is exception which is a noble gas but have 2 electrons in outermost cell )

4 — Element F , which is hydrogen. ( Hydrogen is the only element to not have any neutron )

5 — Element D ( Which is sodium )

6 — The element F ( Which is hydrogen ) Don't contain any neutron.

________________________________

The protein secondary structure shown in the figure represent α-helix.

The helical structures:

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At the end of the conversion: 0.51 - 0.6 = -0.09 (negative means the reaction is not feasible), 100 - 1.8 = 98.2 mol remaining of O₂0.75 × 1.8 = , , 1.35 mol remaining of H₂O, 3 × 1.8 = 5.4 mol of CO₂ remaining

a) The cytochromatic table based on oxygen is shown below:

Substance/Reaction:

O₂CH₂O C₃H₆O CO₂H₂O

Number of moles in the feed  is 0.5100100

Number of moles reacted is 0.5200-x3x3x

Number of moles at equilibrium (0.51-x)100-3x3x+0.75x3x+0.25x

The numerical values of all unknowns in the table are: Unknowns Values at equilibrium

(0.51-x)100-3x3x+0.75x3x+0.25x

Limiting reactant and number of moles at start:

Reactant used  O₂

Reactant not used   CH₂O

Number of moles at start    100100

b) Concentrations of the substances remaining in the system at the end of the conversion

Using a 60% conversion rate, the following can be deduced:

3x = 0.6 × 3

    = 1.8x

    = 0.6

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Answer:

C3H6O3

Explanation:

Hydroxyacetone

sodium azide (NaN3) is used to inflate the safety airbags in automobiles (g) This airbag should be filled with N2 at a pressure of 1.15 atm and temperature of 26.0°C. It has a volume of 36 L.

Modern automobiles use numerous technical components and subsystems, each of which performs a specific design function. Some of these have thousands of individual pieces and were made possible by new or improved technologies, such as electronic computers, high-strength polymers, and novel alloys of steel and nonferrous metals. Air pollution, safety regulations, and global manufacturer competition, among other things, have all contributed to the development of some subsystems.

With an estimated 1.4 billion in use worldwide, passenger vehicles have become the main form of family transportation. In the United States, where more than three trillion miles (almost five trillion kilometers) are traveled annually, roughly one-fourth of these are located.

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The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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The result will be the change in entropy of the system (ΔSsys) for the vaporization is 0.051 kJ/K.

To calculate the change in entropy (ΔSsys) for the vaporization of 21.5 g of ethanol at 79.6 °C, we need to use the equation:

ΔSsys = qrev / T

Where:

ΔSsys is the change in entropy of the system

qrev is the heat transferred in a reversible process

T is the temperature in Kelvin

First, let's convert the mass of ethanol from grams to moles:

moles of ethanol = mass / molar mass

moles of ethanol = 21.5 g / 46.07 g/mol

moles of ethanol = 0.467 mol

Now, let's calculate the heat transferred (qrev) for the vaporization of 0.467 mol of ethanol:

qrev = energy required per mole * number of moles

qrev = 38.6 kJ/mol * 0.467 mol

qrev = 18.02 kJ

Since the temperature given is in Celsius, we need to convert it to Kelvin:

T = 79.6 °C + 273.15

T = 352.75 K

Finally, we can calculate the change in entropy:

ΔSsys = qrev / T

ΔSsys = 18.02 kJ / 352.75 K

ΔSsys ≈ 0.051 kJ/K

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Answer:

Please find attached the completed Lewis dot diagram structure for PI₂F

Explanation:

The number of valence electrons are;

Phosphorus = 5 Electrons

Iodine = 2 × 7 electrons = 14 electrons

Chlorine = 7 electrons

The total number of valence electrons = 14 + 7 + 5 = 26 electrons

2) We draw the symbol that represents the basic (general) structure of the molecule as follows;

The sheared electron pair are represented by single bond lines

3) We complete the octet structures round the fluorine and the iodine atoms as attached showing 18 electrons plus 6 shared electron pairs, with a maximum from step 2 to give a total of (18 + 6) 24 electron pairs

4) We add the 2 unaccounted valence electron on the phosphorus atom to give it the stable octet structure, which gives the completed Lewis structure

Answer: to calculate pH use -log[H+] or - log[OH-]..the solution is basic as the “NaOH” is attached to a hydroxide.Since we need to find the pH (per hydrogen) and not the pOH( per hydroxide) we need to find the pOH of the substance first then we subtract that by 14 so we can arrive at the pH of the substance.

Explanation: So -log( 1 x 10^(-5)) = 5 which is the pOH.Now we subtract that by 14 which gives us -9 and now you’d multiply that by -1 bcuz we can’t have a negative so the pH of the substance is 9

Answer:

usage of trills and vibrato

Explanation:

earlier music used trills while later styles would use vibrato.

Answer:

There are seven periods in the modern periodic table.

Answer:

Seven periods

Explanation:

There are seven periods in the periodic table, with each one beginning at the far left. A new period begins when a new principal energy level begins filling with electrons. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements.

The total pressure is  2.08 atm

PHe =  =0.645 atm

PN2= 0.75⋅atm

PNe= 0.684⋅atm

PTotal={0.645+0.75+0.684}⋅atm = 2.08 atm

What is Total pressure ?

          Total pressure can refer to two different quantities in physics, both of which have the dimensions of a pressure: Total pressure in fluid dynamics is defined as the sum of static pressure p and fluid pressure p.

        Pressure is defined as the force applied perpendicular to an object's surface per unit area over which that force is distributed. Gauge pressure is the pressure in relation to the surrounding atmosphere.

            Pressure is expressed using a variety of units. Some of these are derived from dividing a unit of force by a unit of area; for example, the SI unit of pressure, the pascal (Pa), is one newton per square metre (N/m2); similarly, the pound-force per square inch (psi) is the traditional unit of pressure in the imperial and US customary systems.

           The atmosphere (atm) is equal to this pressure, and the torr is 1⁄760 of it. Manometric units such as centimetres of water, millimetres of mercury, and inches of mercury are used in manometers to express pressures in terms of the height of a fluid's column.

           Pressure is defined as the amount of force applied perpendicular to an object's surface per unit area. It is represented by the letter "p" or P. The IUPAC recommends a lower-case p for pressure. Upper-case P, on the other hand, is widely used. The use of P vs p is determined by the field in which one is working, the proximity of other symbols for quantities such as power and momentum, and the writing style.

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Answer:

I think its pollution?

Answer:

Percent yield = 87.77%

Explanation:

Given:

Actual yield = 40.2 grams

Theoretical yield = 45.8 grams

Find:

Percent yield

Computation:

Percent yield = [Actual yield / Theoretical yield] 100

Percent yield = [40.2 / 45.8] 100

Percent yield = 87.77%

The pure form of an atom present in a sample is called the element. No, elements are not always the product of the decomposition reaction.

Decomposition is a chemical reaction in which the compound or the molecule breaks to produce two or more products. The general reaction can be given as,

\(\rm XY \rightarrow X+ Y\)

And,

\(\rm compound \rightarrow element + element\)

The splitting of metal hydroxide into the water and metal oxide is an example of a decomposition reaction. Elements can be found in the free state.

Therefore, the statement is incorrect.

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Answer:

Light travels as a wave.

Explanation:

But unlike sound waves or water waves, it does not need any matter or material to carry its energy along. This means that light can travel through a vacuum—a completely airless space. (Sound, on the other hand, must travel through a solid, a liquid, or a gas.)

Answer:

Jane and Matt inherited eye color from their mother.

Explanation:

Their mom has brown eyes, and both jane and matt have brown eyes. They didnt get the eye color from their father.

The mistake that was made by Layla is that the experiment lacks a control.

We know that an experiment is the way by which we are able to establish the cause and effect relationship between variables. We know that the whole essence of an experiment is to test the effect that the independent variable could have on the dependent variable.

In this case, we can see that there is the lack of a control variable. The control variable is what helps us to be able to ascertain the validity of the experiment and the control variable is lacking in this experiment.

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When H₂S gas is removed from the system at equilibrium, the reaction shifts to the right (products) and the concentration of NH₃ increases (option C)

A French scientist (Chatelier) postulated a principle which helps us to understand a chemical system in equilibrium.

The principle states that If a an external constraint such as change in temperature, pressure or concentration is imposed on a system in equilibrium, the equilibrium will shift so as to neutralize the effect.

According to Chatelier's principle a decrease in concentration of the products will favor the forward (right) reaction.

From the above principle, we can conclude that when H₂S gas is removed from the system at equilibrium, the reaction shifts to the right (products) and the concentration of NH₃ increases.

Thus, the correct answer to the question is option C

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Answer:

Law of multiple proportions

Explanation:

By using a sensitive mass balance, it is indeed possible to track the progress of a reaction that generates a gas, so it is True. This is due to the principle of conservation of mass, which states that mass is neither created nor destroyed during a chemical reaction.

A sensitive mass balance can accurately measure even small changes in mass. By continuously monitoring the mass of the reaction vessel, any increase in mass can be attributed to the production of the gas. This provides a quantitative measurement of the reaction's progress over time.

The sensitivity of the mass balance is crucial in this context, as it allows for the detection of minute changes in mass. The precision of the instrument ensures that the measurements are reliable and can be used to follow the kinetics of the reaction.

This method is particularly useful for reactions that generate gases as one of the products, such as the decomposition of certain compounds or the release of carbon dioxide during fermentation processes.

In conclusion, a sensitive mass balance can be followed to track the progress of a gas-producing reaction by measuring the increasing mass of the reaction vessel, which reflects the production of gas over time.

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Percent by mass of volatile water in hydrated salt (%): 32.7

Average percent H_2O in hydrated salt (% H_2O): 32.7

Hydration is the process of adding moisture or water to a substance, such as a plant or an animal, to keep it healthy. Hydration is essential for the optimal functioning of cells and organs in the body, and for maintaining the balance of fluids in the body. Hydration helps to keep the body’s temperature regulated, and helps to transport nutrients and other substances throughout the body. Hydration also helps to reduce fatigue and increase alertness.

It is important to stay hydrated by drinking plenty of water throughout the day. In addition to water, other drinks such as sports drinks, coconut water, and fruit juices can help to keep the body hydrated. Eating foods that have a high water content, such as fruits and vegetables, can also help to ensure adequate hydration.

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