Which of the following units is rarely, if ever, used in science labs?

A.centimeter

B.gram

C.quart

D.milliliter​

Answer:

I don't know what your options are on this question.

pH refers to a solutions' acidity. The acidity is ranked from 0 to 14. 0 to 6 means a solution is acidic. 7 is neutral. 8 to 14 is non-acidic, or a base or alkaline. The farther away from 7 the more acidic or the more non-acidic  the solution is.

I hope this helps.  

Explanation:

Answer:

A. the negative log of the hydronium ion concentration

Explanation:

just took the quiz on Edg

Answer:

Maybe mol

Explanation:

Answer:

oxidation takes place at the anode while reduction takes place at the cathode.

Explanation:

In the process of electrolysis the electric current is passed accross an ionic compound, the compound could either be in it's molten state or dissolved in a solvent. When there is connection between the anode and cathode are by a wire, there is always a flow of electrons from anode to cathode.

A redox reaction reffers to a chemical reaction in which there are both process of oxidation and the process of reduction i.e loss of election and gain of electrons occured simultaneously.

During the process of electrolysis, there is oxidation of an ion at anode which is the negative charged electrode, reduction as well takes occur at cathode which is the positively charged electrode at the same time.

Answer:

In both types of voltaic and electrolytic cells the redox process that takes place at the anode is oxidation while the redox process that takes place at the anode is reduction

Explanation:

Electrons flow from the anode, the negative electrode to the cathode, the negative electrode.

Since oxidation involves the loss of an electron, therefore, oxidation takes place at the anode. Conversely, since reduction involves the gaining of an electron, the redox reduction process takes place at the cathode.

The cathode and anode form the electrodes in the voltaic cell through which electrons flow from one half cell, the anodic cell, to the other half cell, the cathodic cell.

1. How many moles of H₂ would be required to produce 9.0 grams of water?

The answer would be approximately 0.4495 moles of H₂.

2. What mass of H₂O is formed when excess H₂ reacts with 64 g of O₂?

A mass of  72g H₂O will be formed.

3.How many moles of SnF₂ will be produced along with 48 grams of H₂?

Approximately 23.811 moles of SnF₂ will be produced.

4. How many moles of sodium are required to produce 40. grams of NaOH?

The answer would be approximately 1.000722 moles of sodium.

I could only answer 4 of them so sorry, I had like check over it.

The last 2 were super confusing for me.

Answer:75

Explanation:Hello Bella, how are you today? Looking for my answer I see. Good luck, and next time don't use your real name.

Answer: 2.91 m

Explanation:

Final answer:

To calculate the molality of the solution, divide the moles of solute by the mass of solvent in kilograms. In this case, the moles of NaCl is 0.435 and the mass of water is 150 grams, so the molality is 2.907 mol/kg.

Explanation:

To calculate the molality of the solution, we need to use the formula:

Molality (m) = moles of solute / mass of solvent (in kg)

First, we need to convert the mass of NaCl to moles:

Moles of NaCl = mass of NaCl / molar mass of NaCl

Moles of NaCl = 25.5 g / 58.5 g/mol = 0.435 moles

Next, we need to convert the volume of water to mass:

Mass of water = volume of water x density of water

Mass of water = 150 mL x 1.00 g/mL = 150 g

Finally, we can calculate the molality:

Molality = Moles of NaCl / Mass of water (in kg)

Molality = 0.435 moles / 0.150 kg = 2.907 m

So, the molality of the solution is approximately  2.907 mol/kg.

The question involves the application of Charles' Law. For a gas at constant pressure, when the volume increases from 350 ml to 400 ml, the temperature also increases. The new temperature is approximately 91 °C.

This question involves the concept of Charles' Law in the subject of physics, which states that the volume of a gas is directly proportional to its temperature provided pressure remains constant. So, if a gas's volume increases, its temperature should increase as well, and vice versa. We can set up the following equation based on Charles' Law: V1/T1 = V2/T2, where V1 = 350 ml, T1 = 45 °C + 273 = 318 K (you must convert Celsius to Kelvin in gas law problems), V2 = 400 ml, and T2 is what we're trying to find.

After substituting the known values, we have 350/318 = 400/T2. Solving for T2 gives us approximately 364 K. Finally, we convert this back into °C by subtracting 273, so the new temperature T2 is around 91 °C.

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Answer:

Student's percent yield =  94.6%

Explanation:

Given:

Estimated yield of BaSO₄(s) = 1.352 grams

Actual yield = 1.279 grams

Find:

Student's percent yield = ?

Computation:

Student's percent yield = [Actual yield / Estimated yield of BaSO₄(s)]100

Student's percent yield = ( 1.279 grams / 1.352 grams)100

Student's percent yield = (0.946)100

Student's percent yield =  94.6%

The percent yield of BaSO4(s) is 94.6%, calculated by dividing the actual yield by the theoretical yield and then multiplying by 100.

The student's percent yield of BaSO4(s) can be calculated using the formula for percent yield, which is (actual yield/theoretical yield) × 100%. In this case, the student has an actual yield of 1.279 grams and a theoretical yield of 1.352 grams.

The calculation for percent yield will be: (1.279 g / 1.352 g) × 100% = 94.6%

Percent yield is an important concept in gravimetric analysis and it helps chemists understand the efficiency of a precipitation reaction in experiments.

Final answer:

When 40.0 g of NaOH is added to 1.00 L of water, it does not make a 1.00 M NaOH solution because the molarity of a solution is calculated by dividing the number of moles of solute by the volume of the solution in liters.

Explanation:

When 40.0 g of NaOH is added to 1.00 L of water, it does not make a 1.00 M NaOH solution because the molarity of a solution is calculated by dividing the number of moles of solute by the volume of the solution in liters.

To make a 1.00 M NaOH solution, we need to know the number of moles of NaOH and the volume of the solution in which it is dissolved. In this case, we are given the mass of NaOH (40.0 g) but not the volume of the solution. Without the volume, we cannot calculate the molarity.

To determine the molarity, we need to know either the volume of the solution or the number of moles of NaOH added to the solution.

Answer:

The bimolecular rate constant for the reaction Cl + O3 → ClO + O2 is measured over the temperature range 210 to 360 K in a discharge flow system using Cl atom resonance fluorescence at 134.72 nm to monitor the decay of Cl under pseudo first order conditions. Results, expressed in the form k1 = (2.35 ± 0.5) × 10−11 exp[−(171 ± 30)/T], are compared with other recent studies of this reaction. Stratospheric implications are discussed briefly including the possibility of a concurrent three-body mechanism with O2 forming ClO3.

Explanation:

Answer:

C. Single covalent bond

Explanation:

A covalent bond would form between these atoms. Covalent bonds

involve atoms sharing electrons.

have a good day

-Hops

Answer:

Increase pressure

Explanation:

Liquids and solids exhibit practically no change of solubility with changes in pressure. Gases as might be expected, increase in solubility with an increase in pressure. This is typified by Henry's law. Henry's Law states that: The solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution.

Temperature affects the solubility of both solids and gases, but pressure only affects the solubility of gases. Surface area does not affect how much of a solute will be dissolved, but it is a factor in how quickly or slowly the substance will dissolve.

The solubility of a solid may increase or decrease with increasing temperature, whereas the solubility of a gas decreases with an increase in temperature and a decrease in pressure.

Since the chemical referred to in the question can not be a gas, then increase in pressure will not affect its solubility.

Answer: dissociates in water, is an electrolyte, and is a salt

Explanation:

Answer:

a

b

d

edge 2021

Explanation:

Answer:

a subscript

Explanation:

Answer:

A.

Explanation:

'4' is a subscript which shows the number of atoms.

Answer:

Freezing point of the solution is -1.07°C

Explanation:

The addition of a solute to a solvent decreases its freezing point following the formula:

ΔT = Kf×m×i

Where ΔT is change in temperature (0°C - X); Kf is constant of solvent (1.86°C/m), m is molality (moles glucose per kg solvent) and i is Van't Hoff factor (1 for glucose).

Molality of the solution is:

15.5g glucose -Molar mass 180.156g/mol- contains:

15.5g × (1mol / 180.156g) = 0.086 moles of glucose / 0.150 kg water = 0.574 m

Replacing:

0°C - X = 1.86°C/m × 0.574 × 1

-X = 1.07°C

Freezing point of the solution is -1.07°C

The freezing point of an aqueous solution of 15.5 g glucose dissolved in 150 g water will be "-1.07°C".

According to the question,

Constant of solvent, [tex]K_f[/tex] = 1.86°C/m

Change in temperature, ΔT = 0°C - X

Grams of glucose = 15.5 g

Grams of water = 150 g

We know the relation,

Solution's molality = 15.5 × [tex]\frac{1 \ mol}{180.156}[/tex]

                               = [tex]\frac{0.086}{0.150}[/tex]

                               = 0.574 m

hence,

→ ΔT = [tex]K_f[/tex] × m × i

By substituting the values,

0°C - X = 1.86° × 0.574 × 1

        X = -1.07°C      

Thus the answer above is correct.

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Answer:

The litmus paper will turn blue; Ca(OH)₂  

Explanation:

Limewater is a dilute aqueous solution of calcium hydroxide.

Ca(OH)₂(aq) ⟶ Ca²⁺(aq) + 2OH⁻ (aq)

Limewater contains hydroxide ions. They cause the limewater to be basic.

Litmus is a mixture of dyes extracted from lichens. They are weak acids with complicated formulas.

Let's just write the formula for litmus as HLit.

The hydroxide ions from limewater react with the H of litmus to form a salt — the base form — and water.

    HLit + OH⁻ ⟶     Lit⁻    + H₂O

acid form            base form

    red                      blue

The base form of litmus is blue, so

Red litmus turns blue in the presence of limewater.

Red litmus paper turns blue when added to limewater due to its alkaline nature (Ca(OH)2).

When red litmus paper is added to limewater, it will turn blue. This color change occurs because limewater, which has the chemical formula Ca(OH)2, is alkaline/basic in nature. The reaction between the red litmus paper and the limewater indicates the alkaline properties of limewater.

Answer:

6tfvygvbhj

Explanation:

Answer: d) [tex]MgCl_2[/tex] and [tex]H_2O[/tex]​

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

A neutralization reaction is a double displacement reaction in which an acid reacts with base to produce salt and water. The [tex]H^+[/tex] ions from water reacts with [tex]OH^-[/tex] ions from base to give water.

[tex]2HCl+Mg(OH)_2\rightarrow MgCl_2+2H_2O[/tex]

Thus products that will be released when the antacid is mixed with the hydrochloric acid in the stomach are [tex]MgCl_2[/tex] and [tex]H_2O[/tex]​

Final answer:

When magnesium hydroxide (Mg(OH)2) reacts with hydrochloric acid (HCl) in the stomach, water (H₂O) and magnesium chloride (MgCl₂) are produced.

Explanation:

When an antacid such as magnesium hydroxide (Mg(OH)2) is mixed with hydrochloric acid (HCl) in the stomach, the following reaction occurs:

2 HCl(aq) + Mg(OH)₂ (aq) → 2 H₂O(l) + MgCl₂ (aq)

This reaction produces water (H₂O) and magnesium chloride (MgCl₂) as the products.

Answer:

higher gas pressure inside the balloon

Explanation:

The kinetic energy of an object is defined as the work needed to accelerate an object of a given mass from rest to motion.

A person walking is an example of kinetic energy.

The particles of a gas inside a balloon are experiencing an increase in their average kinetic energy and the number of collisions  with the wall of the balloon due to higher gas pressure inside the balloon

Answer:

Graph D is correct since the Force is inversely proportional to the square of the distance.

Graph D is correct.

The relationship between Coulomb force and the distance between the charged particles is as follows:-

[tex]F=k(q_1*q_2)/(r^2)[/tex]......(1)

Here, q1 and q2 are the charges, r is the distance between charged particles, and k is the coulomb constant.

From equation (1), it can be said that the force is inversely proportional to the square of the distance. So, Graph D is correct.

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Answer:

350ml

Explanation:

trust

M, sometimes known as a molar, stands for molarity. When one gram of solute dissolves in one litre of solution, the solution has a molarity of one. Here the concept molarity is used to determine the new volume of water and it is 360 mL.

One of the most widely used units for measuring solution concentration is the moles/litre, which is symbolised by the letter "M" and is defined as the number of moles of solute in a litre of solution. The amount of solute or the volume of solvent is often calculated using molarity.

If these factors change, the volume of the solution changes according to how the molarity fluctuates with temperature and pressure.

The relationship existing between the molarity and volume of two solutions is given as:

M₁V₁ = M₂V₂

V₂ = M₁V₁  / M₂

18.0 × 10.0  / 0.50 = 360 mL

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Answer:

Mould

Explanation:

I think mould (fungi)

Answer:

Yeah, uh huh, you know what it is Crust moving cause of plate tectonics Yeah, mantle’s like plastic And the core is really dense and metallic Memorize this song and you’ll know everything about the Crust and mantle, crust and mantle, crust and mantle, crust and mantle Moving on down there are two more layers called the Outer core, inner core, outer core, inner core Mr. Lee, science teacher, at it again Sick flow spittin’ that regurgitation Ready to begin so without further adoI’mma hop up on this fresh beat so I can teach you About the layers of the Earth, first things first The outermost layer is the crust filled with dirt And rocks and sand, I hope you understand The crust is the layer on top of which we stand Its made out of rocks, mostly igneous Oceanic crust the densest and the skinniest Sinks below some other crust during subduction Which might result in a volcano and eruption

Explanation:

Answer: 15.62 moles of [tex]HgO[/tex] are needed to produce 250.0 g of [tex]O_2[/tex]

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]    

[tex]\text{Moles of} O_2=\frac{250.0g}{32g/mol}=7.812moles[/tex]

[tex]2HgO\rightarrow 2Hg+O_2[/tex]

According to stoichiometry :

1 mole of [tex]O_2[/tex] is produced from decomposition of =  2 moles of [tex]HgO[/tex]

Thus 7.812 moles of [tex]O_2[/tex] will be produced from decomposition of  =[tex]\frac{2}{1}\times 7.812=15.62moles[/tex] of [tex]HgO[/tex]

Thus 15.62 moles of [tex]HgO[/tex] are needed to produce 250.0 g of [tex]O_2[/tex]

Answer:

C-15.63

Explanation:

Correct on EDGE

Answer:

She is not correct because ∠1 is an alternate exterior angle with ∠3, not the angle that measures 105°. So m∠1 = 75°.

Explanation:

Hope This Helps :)

The measure of m<1 is 75 degrees showing that Carmen is incorrect.

The measure of <3 and 105 degrees are supplementary hence;

m<3 + m<105 = 180

m<3 = 180 - 105

m<3 = 75 degrees

From the diagram the two lines are parallel to each other, hence m<1 = m<3 (alternate exterior angle)

Hence the measure of m<1 is 75 degrees showing that Carmen is incorrect.

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The term for the different forms of a gene for a given trait is alleles. Therefore, option C is correct.

Leading texts on genetics and evolution define an allele as a different variation of the same sequence of nucleotides at the same location on a long DNA molecule. "The chromosomal or genomic location of a gene or any other genetic element is called a locus, and alternative DNA sequences at a locus are called alleles.

Any one of two or more genes that may alternately appear at a specific position on a chromosome is known as an allele, also known as an allelomorph. The expression of a specific trait may be influenced by a single allele, many alleles, or pairs of alleles.

A kind of gene is an allele. Individual qualities are determined by genes. Alleles play a part in the diversity of phenotypic expression.

Thus, option C is correct.

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Answer:

B. Compare the speed of her toy to another similar toy.

Explanation:

A body is said to be in motion when there is a change in position with respect to time. The speed of a body in motion is a measurement of distance to time. The formula is given thus;

Speed = Distance * Time

To accurately determine the fastness or slowness of a moving object, comparisons should be made, or a standard used to ascertain the truth. When a comparison is made with an object with similar characteristics, then it becomes easier to know which is moving faster or slower when the speeds are compared. An average can be obtained, and if the speed of the object being checked falls below average, then it is slow. If the speed is above average, then it is fast.

So, for Yasmine to know if her toy is moving fast or slow, she needs to compare hers with another similar toy.

Yasmine can determine the speed of her toy by measuring the distance it travels in a set time, comparing this speed to another toy, or calculating the duration the toy travels for a fixed distance.

To determine if her toy moves fast or slow, Yasmine can conduct a few simple tests. First, she can measure the distance her toy travels over a certain period of time. This is the basic principle behind speed, which is defined as distance travelled per unit of time. The larger the distance it can travel in a short time, the faster the toy is.

Secondly, she may compare the speed of her toy with another similar toy. If her toy travels the same distance in less time, then it's faster. If it takes more time, then it's slower.

Lastly, Yasmine can calculate how long the toy travels for a fixed distance. The shorter the time taken, the faster the toy is.

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Answer: A. 2.3

Explanation:

pH of a solution is given by the following mathematical expression;

pH = - Log [ H+]

     =  -Log [ 5.4 x 10-3]

     = 3 - 0.7324

pH  = 2.27 aprrox 2.3

Answer:

The amount of sunlight and rainfall in different climates determines the climate temperature and humidity hence the majority of the factors of a climate

Explanation:

The climate of  a place is its average weather condition, such as the temperature, snow and rainfall, wind etc. The factors that determines the climate of a region includes the amount of sunlight received, the height above sea level etc

The amount of sunlight determines the amount of heat energy received at a location and hence the temperature of the climate

The amount of rainfall will determine how wet or cold a place as well as the dissipation of the energy from the sun.

Therefore, the amount of sunlight and rainfall in different climates determine the climate temperature and humidity and other dependent climate factors.

The amount of sunlight and rainfall in different climates determines the climate temperature and humidity hence the majority of the factors of a climate. The amount of rainfall and sunlight changes the weather as follows:-

The climate of  a place is its average weather condition, such as the temperature, snow and rainfall, wind etc.

The factors that determine the climate of a region includes the amount of sunlight received, the height above sea level etc

The amount of sunlight determines the amount of heat energy received at a location and hence the temperature of the climate  and the amount of rainfall will determine how wet or cold a place as well as the dissipation of the energy from the sun.

Therefore, the amount of sunlight and rainfall in different climates determine the climate temperature and humidity and other dependent climate factors.

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Answer: 319.9g

Explanation:

Mass of graduated cylinder with water = 534.26g

Mass of  graduated cylinder = 214.36g

Mass of just water = Mass of graduated cylinder with water - Mass of graduated cylinder.

Mass of just water = 534.26g  -  214.36 g =  319.9g