2. Explain what an isotope is and give two important physical properties of isotopes that make them useful in biological research. Define half-life.​

Answer:

the right side of the periodic table are metals while the left side are non metals (with the exception of hydrogen)

Answer:

A triple bond have two pi bonds.

Explanation:

This is an alkaline that contains one sigma bond and two pi bonds.

Hope my answer helps.

Answer:

Two

Explanation:

For the given reaction increasing the pressure will cause the equilibrium to shift to the left, towards reactants.

According to this law on applying extrenal stress on the equilibrium state of any reaction then it will shift to that side where effect of the stress getting low.

Given chemical reaction is:

2SO₂(g) + O₂(g) → 2SO₃(g) + heat

In the reaction heat is also produced in the forward direction and from the ideal gas equation PV=nRT it is clear that pressure is directly proportional to the temperature. So when we increasing the presssure then temperature will also increase as a result of increase in heat. So minimize this effect reaction will shift to the left side.

Hence reaction will shift to the left side of the equilibrium.

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The correct answer is D. Probeware is useful for obtaining many measurements in rapid succession.

Explanation:

Probeware refers to specialized equipment and programs that collect and analyze data. Indeed, Probeware integrates tools to register information such as distance or temperature with software. This complex system is useful to record and analyze a lot of data or measurements, which is not possible with analog tools. Moreover, due to the integration of software, multiple measurements can be recorded and analyzed in a short time, which is known as rapid succession. According to this, one difference between Probeware and analog tools is that "Probeware is useful for obtaining many measurements in rapid succession."

Answer:

Probeware is useful for obtaining many measurements in rapid succession.

Answer:

0.0452

Explanation:

Its Grams and milligrams.Just like dividing by ten, except 3 times.

Answer:

B) 1

Explanation:

Lithium is a univalent element, univalent means that it has only one valence electron. If this is true, then lithium can only provide this one valence electron in a voltaic cell.

From the foregoing, each lithium atom can only provide one valence electron in the voltaic cell.

Answer:

B) 1

Explanation:

I got it in class!

Hope this Helps!! :))

Answer:

Ksp = 8.8x10⁻⁵

Explanation:

Full question is:

After mixing an excess PbCl2 with a fixed amount of water, it is found that the equilibrium concentration of Pb2+ is 2.8 × 10–2 M. What is Ksp for PbCl2?

When an excess of PbCl₂ is added to water, Pb²⁺ and Cl⁻ ions are produced following Ksp equilibrium:

PbCl₂(s) ⇄ Pb²⁺ + 2Cl⁻

Ksp = [Pb²⁺] [Cl⁻]²

If an excess of PbCl₂ was added, an amount of Pb²⁺ is produced (X) and twice Pb²⁺ is produced as Cl⁻ (2X):

Ksp = [X] [2X]²

Ksp = 4X³

As X is the amount of Pb²⁺ = 2.8x10⁻²M:

Ksp = 4(2.8x10⁻²)³

Answer:

3.3 cm³

Explanation:

Use the density formula, d = m/v, to solve for the volume:

2.7 = 9.0/v

2.7v = 9.0

v = 3.3 cm³

Answer:

The internal combustion engine in the car converts the potential chemical energy in gasoline and oxygen into thermal energy which is transformed into the mechanical energy that accelerates the vehicle (increasing its kinetic energy) by causing the pressure and performing the work on the pistons.

Answer:

A, B, and C are the correct options.

Explanation:

I just did it on Edge2023

Answer:

[tex]m_{solution}=446.4g[/tex]

Explanation:

Hello,

In this case, by-mass percent is computed in terms of the mass of the solute and the mass of the solvent as shown below:

[tex]\% m=\frac{m_{solute}}{m_{solution}} *100\%[/tex]

Thus, solving for the mass of the solution, we obtain:

[tex]\frac{x}{y} m_{solution}=\frac{m_{solute}}{\% m}*100\%\\ \\m_{solution}=\frac{62.5g}{14.0\%}*100\% \\\\m_{solution}=446.4g[/tex]

Regards.

Answer:

$195

Explanation:

Step 1: Given data

Step 2: Calculate the total estimated cost for remodelling the interior of an apartment

We will use the following expression.

C = cC × nC + cB × nB + cH × nH

C = $13.69 × 3 + $9.53 × 2 + $135 × 1

C = $195

Answer:

1.08 × 10⁻⁵ M

Explanation:

Calculate the solubility of BaCrO₄ in water at 25°C. You'll find data in the ALEKS Data tab. Round your answer to 3 significant digits.

Step 1: Write the reaction for the solution of BaCrO₄

BaCrO₄(s) ⇄ Ba²⁺(aq) + CrO₄²⁻(aq)

Step 2: Make an ICE chart

We can relate the molar solubity (S) with the solubility product constant (Ksp) using an ICE chart. The Ksp for BaCrO₄ is 1.17 × 10⁻¹⁰.

        BaCrO₄(s) ⇄ Ba²⁺(aq) + CrO₄²⁻(aq)

I                               0                  0

C                             +S               +S

E                               S                 S

The solubility product constant is:

Ksp = 1.17 × 10⁻¹⁰ = [Ba²⁺] [CrO₄²⁻] = S²

S = √1.17 × 10⁻¹⁰ = 1.08 × 10⁻⁵ M

Explanation:

hope these help you answer

Answer:

b. has a low specific heat capacity.

Explanation:

Hello,

In this case, since the specific heat is defined as the heat required to increase or decrease 1 degree Celsius 1 gram or mole of a specific substance, we infer that the lower the specific heat, the less energy will be needed for such increase or decrease, therefore, it turns out easier to modify the temperature in a substance that b. has a low specific heat capacity.

Best regards.

Answer:

Yes, the 4 Krabby patties are an example of high precision.

Explanation:

Precision is the closeness of the values ​​obtained by applying them to the same parameter. To calculate the precision, the closeness of each of the values ​​with the mean must be determined, all the values ​​will be taken by subtracting the mean and the values ​​will be taken into account to know which are the most accurate.

(12.12 + 11.9 + 12.2 + 12. 1) / 4 = 12.08

12.12 - 12.8 = 0.04

11.9 - 12.08 = - 0. 18

12.2 - 12.08 = 0.12

12.1 - 12.08 = 0.02

The most accurate precision is that of the fourth Krabby Pattie and the least precise is that of the second.

Explanation:

Step 1:  Determine what precision and accuracy is

According to online, "precision is how close measure values are to each other, basically how many decimal places are at the end of a given measurement. Precision does matter. Accuracy is how close a measure value is to the true value. Accuracy matters too, but it's best when measurements are both precise and accurate."

Step 2:  Determine which are displayed in this problem

We can see that most of these weight are really close to the original weight which means that the accuracy is pretty high.  This means that our weights are fairly close to the original predicated amount.

We can also see that our precision is somewhat decent because most of the numbers bunch up around each other.  Precision and accuracy don't have to occur at the same time.  For example, a precise collection can be 15, 15.01, 14.99.  Although they are far away from the original point, they are bunched up together giving a high precision.

Answer:

See attached picture.

Explanation:

Hello,

In this case, for the given name, you can verify the structure on the attached picture, wherein you can see verify the presence of both the ethyl and methyl radicals at the third carbon as well as the triple bond at the first carbon.

Best regards.

Answer:

[tex]6118.11\frac{in}{min}[/tex]

Explanation:

Hello,

In this case, by knowing that 1 inch equals 2.54 cm and 60 seconds equals 1 min, the resulting value results:

[tex]=259\frac{cm}{s}*\frac{1in}{2.54cm}*\frac{60s}{1min}\\ \\=6118.11\frac{in}{min}[/tex]

Best regards.

Answer:

[tex]2CH_3OH_{(l)} + 3O_2_{(g)} --> 2CO_2_{(g)} + 4H_2O_{(g)}[/tex]

Explanation:

The reaction between methanol and oxygen can be expressed as an equation below:

[tex]CH_3OH + O_2 --> CO_2 + H_2O_[/tex]

However, the equation is not balanced as the number of the molecule of each atom on the right-hand side and the left-hand side is not the same. The balanced equation showing the phases of all the reactants and products is as below:

[tex]2CH_3OH_{(l)} + 3O_2_{(g)} --> 2CO_2_{(g)} + 4H_2O_{(g)}[/tex]

Two molecules of liquid methanol react with three molecules of oxygen gas to give 2 molecules of carbon dioxide gas and four molecules of water vapor.  

Answer:

[tex]m_{Be}=51.3gBe[/tex]

Explanation:

Hello,

In this case, with the given chemical reaction:

[tex]Be(s) + 2H_2 O(l) \rightarrow Be(OH)_ 2 (aq) + H _2 (g)[/tex]

We can notice a 1:1 mole ratio between hydrogen gas and beryllium metal, therefore, beryllium requirement is computed as shown below:

[tex]m_{Be}=11.5gH_2*\frac{1molH_2}{2.02gH_2} *\frac{1molBe}{1molH_2} *\frac{9.01gBe}{1molBe}\\ \\m_{Be}=51.3gBe[/tex]

Regards.

Answer:

The answer is

Explanation:

Since the concentration , mass and molar mass of NaOH has been given we use the formula

To find the volume

where

C is the concentration

m is the mass

M is the molar mass

v is the volume

Making volume the subject we have

From the question

C = 1.25 M

m = 60 g

M = 40.0 g/mol

Substitute the values into the above formula and solve for the volume

We have

We have the final answer as

Hope this helps you

Answer:

Search Results

Featured snippet from the web

To calculate the numbers of subatomic particles in an atom, use its atomic number and mass number:

number of protons = atomic number.

number of electrons = atomic number.

number of neutrons = mass number - atomic number.

Explanation:

Answer:

Copper (cu)

Explanation:Copper (Cu), chemical element, a reddish, extremely ductile metal of Group 11 (Ib) of the periodic table that is an unusually good conductor of electricity and heat. Copper is found in the free metallic state in nature. This native copper was first used (c. 8000 BCE) as a substitute for stone by Neolithic (New Stone Age) humans.

. Metallurgy dawned in Mesopotamia as copper was cast to shape in molds (c. 4000 BCE), was reduced to metal from ores with fire and charcoal, and was intentionally alloyed with tin as bronze

atomic number 29

atomic weight 63.546

melting point 1,083 °C (1,981 °F)

boiling point 2,567 °C (4,653 °F)

density 8.96 at 20 °C (68 °F)

valence 1, 2

electron configuration 2-8-18-1 or (Ar)3d104s1

Copper is one of the most ductile metals, not especially strong or hard. Strength and hardness are appreciably increased by cold-working because of the formation of elongated crystals of the same face-centred cubic structure that is present in the softer annealed copper.

Copper (Cu), chemical element, a reddish, extremely ductile metal of Group 11 (Ib) of the periodic table that is an unusually good conductor of electricity and heat. Copper is found in the free metallic state in nature. This native copper was first used (c. 8000 BCE) as a substitute for stone by Neolithic (New Stone Age) humans.  Metallurgy dawned in Mesopotamia as copper was cast to shape in molds (c. 4000 BCE), was reduced to metal from ores with fire and charcoal, and was intentionally alloyed with tin as bronze

atomic number 29

atomic weight 63.546

melting point 1,083 °C (1,981 °F)

boiling point 2,567 °C (4,653 °F)

density 8.96 at 20 °C (68 °F)

valence 1, 2

electron configuration 2-8-18-1 or (Ar)3d104s1

Copper is one of the most ductile metals, not especially strong or hard. Strength and hardness are appreciably increased by cold-working because of the formation of elongated crystals of the same face-centred cubic structure that is present in the softer annealed copper.

Answer:

The garden soil become more acidic.

Explanation:

The pH is defined as -log [H⁺]. An acidic solution contains an important amount of [H⁺]. When the pH increases, H⁺ decreases doing the solution more basic. In the other way, an increasing in H⁺ concentration decreases the pH doing the solution more acidic.

The pH of the garden soil of Olivia decreases after it rained. As pH decreases, [H⁺] increases become the garden soil more acidic.

Answer:

Here is the full question:

200ml hard water was boiled with 100ml N/50 Na2CO3 reagent. After boilingg the volume was again made to 200mand the solution filtered. 25ml of this filtrate required 8.2ml of N/50 HCl for neutralisation.

Calculate the permanent hardness in ppm.

Explanation:

Remember that the hard water was boiled with 100ml N/50 Na2CO3 reagent. Therefore, the milliequivalent of carbonate ion in 100 ml of N/50 Na2CO3 solution is given as 100 × [tex]\frac{1}{50}[/tex] = 2

The solution was made of 200 ml and 25 ml of the filtrate was neutralised with 8.2 ml N/50 HCl.

The milliequivalent of carbonate ions remaining in the filtrate is [tex]\frac{200}{25}[/tex] × 8.2 × [tex]\frac{1}{50}[/tex] = 1.3 milliequivalent

To get the milliequivalent of carbonate ion precipitated, we need to subtract the milliequivalent of the two carbonate ions. This will give us

2 − 1.3 = 0.7g

The amount of  CaCO3  present  in 200 ml water = 0.7 × 50 = 35g

Permanent hardness = [tex]\frac{35}{200}[/tex] × 1000 = 175 ppm.

Permanent hardness of water after boiling is 175ppm.

Hardness of water is of two types, one those will cam be removed by boiling is known as temporary hardness and which can not be removed by boiling is known as permanent hardness.

Given that hard water is heated with = 100mL N/50 Na₂CO₃.

Milliequivalent of carbonate ion in 100ml of N/50 Na₂CO₃ = 100×1/50=2

The milliequivalent of carbonate ions remaining in the filtrate is  200/25× 8.2 × 1/50 = 1.3 milliequivalent

Milliequivalent of carbonate ion precipitated = 2 - 1.3 = 0.7g

The amount of CaCO₃ present in 200 ml water = 0.7 × 50 = 35g

Permanent hardness will be calculated as:

P.H. = 35/200 × 1000 = 175ppm.

Hence, permanent hardness of water is 175ppm.

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Answer:

molecular formula is "SiF4" and compound name is "silicon tetrafluoride"

Explanation:

The number of neutrons is variable, resulting in isotopes, which are different forms of the same atom that vary only in the number of neutrons they possess. Together, the number of protons and the number of neutrons determine an element's mass number.

tbh google

hope it helps

Explanation:

The atoms of a chemical element can exist in different types. These are called isotopes. They have the same number of protons (and electrons), but different numbers of neutrons.

The final temperature of the mixture will be "305.6 K".

According to the question,

Mass of water, m₁ = 30.0 mL or,

                              = 30.0 mL × 1 g/mL

                              = 30.0 g

and,

                        m₂ = 50.0 mL × 1 g/mL

                              = 50.0 g  

Specific heat of water = 4.18 J/g°C

We know the relation,

→ Heat lost + Heat gained = 0

By substituting the values,

  30.0 × 4.18 (T - 282) + 50.0 × 4.18 (T - 320) = 0  

30.0 × 4.18T - 1178.76 + 50.0 × 4.18T - 1337.6 = 0

hence,

The final temperature will be:

                                        T = 305.6 K

Thus the answer above is appropriate.

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Answer:

Science is both boon and curse for living beings.

Science is the action to find out any fact regarding the natural world.

Science gives accurate facts, formulas, laws and theories.

Science has many major fields like chemistry, physics, biology etc.

Science is valued by society because the application of scientific knowledge helps to satisfy many basic human needs and improve living standards.

Answer:

166 g

Explanation:

Step 1: Write the reaction for the obtaining of Fe from magnetite

Fe₃O₄ ⇒ 3 Fe + 2 O₂

Step 2: Calculate the moles corresponding to 120 g of Fe

The molar mass of Fe is 55.85 g/mol.

120 g × (1 mol/55.85 g) = 2.15 mol

Step 3: Calculate the moles of Fe₃O₄ required to produce 2.15 moles of Fe

The molar ratio of Fe₃O₄ to Fe is 1:3. The moles of Fe₃O₄ required are 1/3 × 2.15 mol = 0.717 mol

Step 4: Calculate the mass corresponding to 0.717 moles of Fe₃O₄

The molar mass of Fe₃O₄ is 231.53 g/mol.

0.717 mol × 231.53 g/mol = 166 g