If gas in a sealed container has a pressure of 50 kPa at 300 K, what will the pressure be if the temperature rises to 360 K?

60 kPa

161 kPa

41 kPa

16 kPa

The isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions because the nuclear reactions involve changes to protons and neutrons in an atom and isotopes differ in neutrons and so they react differently to nuclear changes. While for chemical reactions, the electrons in an atom are involved but the isotopes do not differ in electrons and so they react the same way during chemical changes.

Answer: Option A & C

Explanation:

The reactants of chemical and nuclear reactions are different. The reactants of chemical reactions are the electrons present in the outermost shell of the reactants, while the reactants of nuclear reactions are either the nuclei of reactants or a nuclei and any subatomic particles of other reactants.

Thus it can be understood that chemical reactions consider the electrons while nuclear reactions consider the nuclei or the number of protons and neutrons of the reactants.

The isotopes of elements contain different mass number or we can say different number of neutrons but the number of electrons are same, so they behave differently in nuclear reactions and similar in chemical reactions.

Answer:

A and C

Explanation:

Answer:

Explanation:

10.is false

11. is volcanism

12.true

13.c

14. From the deepest ocean trench to the tallest mountain, plate tectonics explains the features and movement of Earth's surface in the present and the past. Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core

Answer:

Mass of sodium is 0.1305 g.

Explanation:

Given data:

Number of moles of sodium = 0.0135 mol

Molar mass of sodium = 23 g /mol

Mass of sodium = ?

Solution:

Formula:

Number moles = mass / molar mass

Mass = number of moles × molar mass

Mass = 0.0135 mol × 23 g/mol

Mass = 0.3105 g

Final answer:

The mass of 0.0135 mol of sodium (Na) is 0.310 g.

Explanation:

The mass in grams of 0.0135 mol of the element sodium (Na) can be calculated using the molar mass of sodium. The molar mass of sodium is 22.99 g/mol. To calculate the mass, you multiply the number of moles by the molar mass:

Mass (g) = Number of moles x Molar mass

So, the mass of 0.0135 mol of sodium is:

Mass (g) = 0.0135 mol x 22.99 g/mol = 0.310 g

Here's a few connections I can make for you:

The cell membrane is what contains everything in the cell. Akin to the skin on humans.

The cytoplasm contains all the cell substances outside of the nucleus.

The nucleus is the control center of the cell. Inside, are the chromosomes which store DNA. The nucleus is surrounded by the nuclear membrane.

The mitochondria is the powerhouse of the cell. It produces energy also known as ATP.

Ribosomes are found attached to the endoplasmic reticulum. Ribosomes are responsible for protein synthesis.

Answer:

The mass is 1025 grams or 1.025 kgs

Explanation:

Mass = Density * Volume  

Mass = 1.025g/ml (Density) * 1000ml (volume )

Mass = 1.025g/ml * 1000ml= 1025 g  

1025 g = Mass    = 1.025 kgs

Answer:

.0931 is the answer

Explanation:

you need the equations to be equal, so basically you need both of them to add up to 9310 since 9.31 x 10^3 = 9310.

In order to do this you need to move the decimal point on 9.31 to the left by 2, which is .0931.

.0931 x 10^5 = 9310

Answer:

0.0931

Explanation: since 9.31*10^3=9310 and since division is the opposite of multiplication then if you divide 9310 by 10^5 you get 0.0931

Answer:

For 1: The correct answer is Option B.

For 2: The correct answer is Option D.

Explanation:

Average atomic mass is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

The equation used to calculate average atomic mass follows:

[tex]\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i[/tex]

We are given:

For every 100 atoms of X, 30 of them have a mass of 125.0 u and 70 of them have a mass of 126.0 u. This means that fractional abundance of X-125 isotope is 0.3 and that of X-126 isotope is 0.7

Mass of the isotope = 125

Fractional abundance of isotope = 0.3

Mass of the isotope = 126

Fractional abundance of isotope = 0.7

Putting values in above equation, we get:

[tex]\text{Average atomic mass }=[(125\times 0.3)+(126\times 0.7)]=125.7u[/tex]

Hence, the correct answer is Option B.

We are given:

Average atomic mass of sulfur = 32.06 u

Sulfur has 4 naturally occurring isotopes: S-32, S-33, S-34 and S-36

As, the average atomic mass of sulfur lies closer to the mass of S-32 isotope. This means that the relative abundance of this isotope is the highest of all the other isotopes.

The 'S-32' isotope is the most common isotope of the given element.

Hence, the correct answer is Option D.

1. The average atomic mass of element X is 125.7 u

The correct answer to the question is Option B. 125.7 u

2. The most reasonable inference you could make about sulfur (S), which has four stable isotopes and an average atomic mass of 32.06 u is that the most common isotope of sulfur is S-32.

The correct answer to the question is

Option D. The most common isotope of sulfur is S-32.

1. Determination of the average atomic mass of X

Let A represent isotope X-125

Let B represent isotope X-126

For A (isotope X-125)

Mass of A = 125 u

Abundance of A (A%) = 30%

For B (isotope X-126)

Mass of B = 126 u

Abundance of B (B%) = 70%

Average atomic mass of X =?

Average atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100]

=  [(125 × 30)/100] + [(126 × 70)/100]

= 37.5 + 88.2

Thus, the average atomic mass of X is 125.7 u.

The correct answer to the question is Option B. 125.7 u

2. The average atomic mass of an element is closest to the mass of the most abundant isotope of the element.

Thus, we can conclude that the most common isotope of Sulfur is S-32 since it's average atomic mass is 32.06 u

NOTE: Stable isotopes of sulphur are: S-32, S-33, S-34 and S-36

The correct answer to the question is Option D. The most common isotope of sulfur is S-32.

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Answer:

The atomic weight of hypothetical element will be 63.568 amu.

Explanation:

Given data:

First isotope mass = 62.2 amu

Percentage abundance of first isotope = 24%

Mass of second isotope = 64 amu

Percentage abundance of second isotope = 100- 24 = 76%

Solution:

The atomic weight of hypothetical element will be the average atomic mass of its isotopes.

Average atomic mass = [mass of isotope× its abundance] + [mass of isotope× its abundance] +...[ ] / 100

Now we will put the values in formula.

Average atomic mass = [24 ×62.2] + [76× 64] / 100

Average atomic mass = 1492.8 + 4864 / 100

Average atomic mass = 6356.8/100

Average atomic mass =  63.568 amu

The atomic weight of the hypothetical element with isotopes of masses 62.2 u (24% abundance) and 64.0 u is approximately 63.568 u.

The atomic weight of a hypothetical element with two isotopes mass can be calculated by taking the weighted average of their masses and abundances. In this case, we have isotope A with a mass of 62.2 u and an abundance of 24% (0.24), and isotope B with a mass of 64.0 u. To find the atomic weight, we use the following formula:

Atomic Weight = (Isotope A's mass × Isotope A's abundance) + (Isotope B's mass × Isotope B's abundance)

By plugging the values we get:

Atomic Weight = (62.2 u × 0.24) + (64.0 u × (1 - 0.24))

Atomic Weight = (14.928 u) + (64.0 u × 0.76)

Atomic Weight = 14.928 u + 48.64 u

Atomic Weight = 63.568 u

So, the atomic weight of the hypothetical element is approximately 63.568 u.

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Answer:

[tex]\frac{46 g}{1 mL}[/tex] × [tex]\frac{1 kg}{1000 g}[/tex]

= [tex]\frac{46 kg}{1000 mL}[/tex]  

= [tex]\frac{46 kg}{1 L}[/tex]

Explanation:

Since 1 kg is equal to 1000 g we multiply 46g/1mL by 1kg/1000g. Grams being on the bottom of the fraction so that they will cancel out. After this calculation we have 46kg/1000mL. This is equal to 46kg/1L, also written as 46kg/L.

Answer:

22.27 °C = ΔT

Explanation:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m × c × ΔT

Given data:

mass = 28 g

heat absorbed = 58 cal

specific heat of copper =  0.093 cal/g .°C

temperature change =ΔT= ?

Solution:

Q = m × c × ΔT

58 cal = 28 g × 0.093 cal /g.°C × ΔT

58 cal = 2.604 cal.°C × ΔT

58 cal / 2.604 cal .°C = ΔT

22.27 °C = ΔT

A 10.0cm3 volume of alcohol has a mass of 7.05g. [tex]0.705 \frac{g}{c m^{3}}[/tex] is the density

Answer:  [tex]0.705 \frac{g}{c m^{3}}[/tex]

Explanation:

The ratio between the mass of a substance and its unit volume is referred as density.

[tex]\text {Density}=\frac{\text { mass }}{\text { volume }}=\frac{7.05 g}{10.0 \mathrm{cm}^{3}}=0.705 \frac{g}{\mathrm{cm}^{3}}[/tex] is the Answer

Note:

1000 g = 1 kg

100 cm = 1 m

When we used to transform the given values into S.I units, then

[tex]\text {Density}\left(\frac{k g}{m^{3}}\right)=\frac{\text {Mass}(k g)}{\text {Volume}\left(m^{3}\right)}[/tex]

Alcohol’s volume can be written as, [tex]10.0 c m^{3} = 10 \times 10^{-2} m^{3}[/tex]

Alcohol’s mass can denote as, [tex]7.05 g = 7.05 \times 10^{-3} \mathrm{kg}[/tex]

Then, [tex]\text { Density }\left(\frac{k g}{m^{8}}\right)=\frac{, 00705(k g)}{0.1\left(m^{3}\right)} = .0705 \frac{\mathrm{kg}}{\mathrm{m}^{\mathrm{s}}}[/tex]

Answer:

Explanation:

Before answering the questions, it is important to define these given terms:

a) There are 2 countries in North America: Belief

The idea that there are just two countries in North America is wrong. A person might choose to hold on to this false knowledge despite strong evidence that can annul this system of reasoning. He or she might be coming from the point view that in terms of economic prowess, there are just two countries in North America. This is more of a belief.

b) If I jump out a window I will die: belief.

This is more of a belief, there is nothing to prove that if one jumps out of a window, death is inevitable.

c) Through the process of natural selection humans, chimpanzees and

gorillas evolved from a common ancestor species.: Theory

This is a theory that seeks to provide a scientific basis to evolution. To come to this conclusion, observations have been made on humans, chimpanzees and gorillas.

d) Energy can be converted into matter in ratio of E=mc² : Law

This is a scientific law which has been simplified in form of mathematical expression to show the relationship between mass energy.

e) Canada is the greatest country on earth: Belief

This is a mere belief. Almost every Canadian can attest to this assertion. It is a thing of national pride and loyal for one to belief their country is the greatest.

f) Illness comes from microscopic germs, some of which, bacteria can be

seen under the microscope and cultivated outside a host, and others,

viruses, are too small to see under the microscope: Fact

It is a proven fact that germs causes diseases.

Answer:

a) Belief; b) Belief, c) Theory; d) Law; e) Belief; f) Hypothesis

Explanation:

1) The steps involved in scientific method are: a) a researcher make an observation of a process or system; b) he/she make an hypothesis, it means a statement that describes something about the process/system observed; c) Hyphothesis is tested trough experimentation d) During and after experimentation, the researcher makes observations; e) Conclusions are made from the analysis of results; f) A theory that explains the process is made, based on observations and tested trough experimentation. A theory is postulated as a possible explanation, that can change and be replaced in the future.

3) A Law is a statement or equation that exactly describes the relation between different variables and that is universally valid.

2) In constrast, a belief is something that people think but is not supported by knowledge.

Based on this information:

a) is a belief, because someone can think that there are only two countries in North América, but actually there are more than that.

b) is a belief, because we don´t know what will happen.

c) Is a theory, something that was tested trough experimentation and that is already accepted as possible.

d) This is a law, that relates energy with mass.

e) Is a belief too, because someone can think that but there are bigger countries.

f) This could be an hypothesis that needs to be tested trough experimentation.

Magnesium (Mg) has 10 core electrons. Core electrons are the electrons in an atom that occupy the inner energy levels, closer to the nucleus. In the case of magnesium, the electron configuration is 1s² 2s² 2p⁶ 3s².

In an atom, electrons occupy different energy levels or orbitals. The innermost energy level, known as the 1s orbital, can hold up to 2 electrons. The next energy level, 2s, can also hold up to 2 electrons, followed by the 2p orbital, which can hold up to 6 electrons. The electrons in the innermost energy levels, specifically the 1s and 2s orbitals, are considered core electrons.

In the case of magnesium (Mg), its electron configuration is 1s² 2s² 2p⁶ 3s². This means that there are two electrons in the 1s orbital, two electrons in the 2s orbital, six electrons in the 2p orbitals, and two electrons in the 3s orbital. The core electrons in magnesium are those in the filled 1s and 2s orbitals, which add up to a total of 10.

Hence, magnesium has 10 core electrons.

Learn more about core electrons here:

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Answer: Genes

Explanation: Both plants are heterozygous for smooth seeds making it a dominant trait.

Answer:

Final temperature = T₂ = 328.815 K

Explanation:

Given data:

Given energy = 980 KJ = 980×1000= 980000 J

Volume = 6.2 L

Initial temperature =T₁= 291 K

Specific heat of water = 4.18 j /g .K

Final temperature = T₂ = ?

Formula:

Q = m. c . ΔT

ΔT = T₂ - T₁

we will first convert the litter into milliliter

6.2 × 1000 = 6200 mL

It is given in question that

1 mL = 1 g

6200 mL = 6200 g

Now we will put the values in formula,

Q = m. c . (T₂ - T₁)

980000 j = 6200 g . 4.18 j /g .K . (T₂ - 291 K)

980000 j = 25916 j/ k .  (T₂ - 291 K)

980000 j /  25916 j/ k =  T₂ - 291 K

37.8145 K + 291 K =T₂

T₂ = 328.815 K

Answer:

He conducted an experiment using gold foil and alpha particles.

Explanation:

Ernest Rutherford in 1911 performed the gold foil experiment which provided a better outlook to the structure of the atom. In his experiment, he bombarded a thin gold foil with alpha particles. Most of the alpha particles passed through the gold foil and just a few was deflected back.

This observation led Rutherford to propose the nuclear model of the atom in which an atom has a small positively charged centre and electrons moving round it.

Answer:

He conducted an experiment using gold foil and alpha particles.

Explanation:

In his experiment he use the alpha particles (which are positive) emitted by a radioactive element.  If Thomson's plum pudding model was correct, the beam would go straight through the gold foil. But the alpha particles were deflected in all directions, some right back at the source. This suggest that the atom's positive charge was concentrated in a much tinier volume than Thomson imagined

Answer:

Rigid plates that move around Earth's surface is called tectonic plates.

Explanation:

Lithosphere is rigid and relatively cold and is the outer surface of the planet. The convective motions of maintenance break the lithosphere into plates.

This place that a form can move in any direction, can move towards each other, can move away and push each other which is the reason for formation of mountains for shifting of continents for making of ocean basin.  

The most important step in the scientific method is observation. Observations allow scientists to gather data and information about the natural world, which is essential for forming hypotheses, conducting experiments, and drawing conclusions.

The most important step in the scientific method is observation. This is because observations allow scientists to gather data and information about the natural world. Without accurate observations, it would be difficult to form hypotheses, conduct experiments, and draw conclusions.

Observations can be made using our senses, such as seeing, hearing, touching, tasting, and smelling. Scientists carefully observe and record their findings in order to better understand a phenomenon or solve a problem. For example, if a scientist is studying the growth of plants, they would observe and record the height, color, and number of leaves of different plants over a period of time.

Observations help scientists identify patterns and trends, which can then be used to formulate hypotheses and design experiments. They provide the foundation for the entire scientific method and help scientists make informed decisions based on evidence.

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Answer:

$99.99

Explanation:

Given parameters:

Cost of gold per ounce = $323.12

weight of gold in the lab = 8.7739g

Solution

We need to first convert the mass of the weighed gold into ounces from grams:

            1 gram = 0.03527oz

          8.7739g = 8.7739 x 0.03527; 0.31oz

Since 1oz of gold is $323.12

        0.31oz of gold will be 0.31 x 323.12 = $99.99

Answer:

22.96 $ per 1 g of gold

Explanation:

We know that 1 g is equal to 0.035 oz.

Now we formulate the following reasoning:

if         1 oz of gold have a value of 655 $

then    0.035 oz of gold have a value of X $

X = (0.035 × 655) / 1 = 22.96 $

Answer:

$22.92

Explanation:

To solve this problem, you should convert the units to have the same in each quantity.

First we are going to convert from grams (g) to ounces (oz):

[tex]1.00g*\frac{1oz}{28.34g}=0.035oz[/tex]

It means that there are 0.035 ounces in 1 gram.

Then you should multiply that value by the price of gold that is given in ounces (oz):

[tex]0.035ozGold*\frac{655.00}{1ozGold}=22.92[/tex]

That is the price of 1.00 gram of gold is $22.92

Answer:

0.924602

Explanation:

Answer:

Explanation:

3.5 l = .9246 gal

3.5 l = 3500 ml

3.5 ml = .0009246

Answer:

Density is  7.15 g /mL.

Mass is  445.2 g.

Explanation:

Density:

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

D= density

m=mass

V=volume

Symbol:

The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.

Given data:

Mass of first zinc sample = 210.10 g

Mass of second zinc sample = 235.10 g

Combined volume = 62.3 mL

Density of combined sample ?

Mass of combined sample = ?

Solution:

Mass of combined sample = 210.10 g + 235.10 g = 445.2 g

density = mass / volume

density = 445.2 g / 62.3 mL

density = 7.15 g /mL

Answer:

The concentration solution by percent in mass is 8.28%

Explanation:

Molarity is moles of solute present in 1L of its solution .

Hence the formula is  

[tex]$\left.\text {Molarity}=\frac{\text {moles of solute}}{\text {Volume of solution in } L} \text { (unit is } \frac{\text { mol }}{L} \text { or } M\right)=\frac{1.50 \mathrm{mol}}{1 \mathrm{L}}$[/tex]

Let us convert the numerator and the denominator into mass in g

Numerator :                                  

[tex]mass $=$ moles $\times$ molar mass\\\\$=1.50 \mathrm{mol} \times 58.5 \frac{g}{\text { mol }}=87.75 \mathrm{g}$ (solute)[/tex]

Denominator :                        

[tex]$\begin{aligned} \text {mass} &=\text { density } \times \text {volume}=\frac{1.06 \mathrm{g}}{1 \mathrm{ml}} \times 1 \mathrm{L} \\\\ &=\frac{1.06 \mathrm{g}}{1 \mathrm{ml}} \times 1000 \mathrm{ml}=1060 \mathrm{g} \end{aligned}$[/tex]

The formula to find mass percentage is

[tex]$\%$ mass $=\frac{\text { mass of solute }}{\text { mass of solution }} \times 100 \%$[/tex]

[tex]$\%$ mass of $\mathrm{NaCl}=\frac{\text { mass of solute }}{\text { mass of solution }} \times 100 \%$[/tex]

[tex]$=\frac{87.75 g}{1060 g} \times 100 \%$\\[/tex]

=8.28% (Answer)

Answer:

8.27% on edge

Explanation:

Answer:

9.6 %

Explanation:

Step 1: How to define  percent error ?

⇒ % error is the difference between a measured value and the known or accepted value

⇒Percent error is calculated using the following formula:

⇒%error  =  | Experimental value-theoretical value/theoretical value |  x100%

⇔ this can be written as well as : error = (| Experimental value/ theoretical value | - | Theoretical value / Theoretical value | ) x100%

Step 2: Calculate % error

In this case, this means :

%error = ( |(4.45 cm - 4.06cm ) / 4.06cm | ) x100%

%error = 0.096 x100%

%error =9.6 %

The statement is false. Forming a hypothesis is not the first step of the scientific method. The first step is making observations.

The statement is false. Forming a hypothesis is not the first step of the scientific method. It is actually the third step. The first step is making observations, followed by asking a question based on these observations. After these steps, a hypothesis is formed. A hypothesis is an educated guess about the answer to the question posed, based on available information. This guess is then tested through an experiment in the following steps of the scientific method.

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Answer:

The average atomic mass of Y is 123.4725 g/mol

Explanation:

The average mass of an element is calculated by taking the average of the atomic masses of its stable isotopes.

The enitre atomic mass = 100 % or 1

⇒ this consists of 57.25 % atoms with mass 123.90 g/mol

57.25 % = 0.5725

⇒ this consists of 42.75 % atoms with mass 123.90 g/mol

42.75 % = 0.4275

To calculate the mass of this isotope we use the following:

0.5725 * 123.90 + 0.4275 * 122.90 = 123.4725 g/mol

Answer:

Explanation:

One quantitative measurement that can be made from the above diagram is the length of the ruler. The ruler is an instrument used to measure short distances in the order of centimeters. Longer distances can be measured using a tape rule.

Mass is the amount of matter a substance contains. Weight is a function of mass and gravity on a body. When the mass of a body is recorded, it is the same everywhere in the universe. Weight on the other hand varies as gravity changes.

Answer:

The pencil measures approximately 5.5 units and mass is the amount of matter contained in a body and weight is the action that exerts the force of gravity on the body.

Explanation:

A quantitative measure that can be made from the scene shown is the length of the pencil because to measure it quantitatively we have a rule. The pencil measures approximately 5.5 units in length.

Mass is the amount of matter contained in a body and weight is the action that exerts the force of gravity on the body. The mass of an object will remain constant regardless of where it is measured, while the weight of the object will vary according to the force of gravity acting on it, which is different from the place on earth where the measurement is made.

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