Define the term relative molecular mass​

Answer:   " 0.69 g / mL "

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Explanation:  

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The "pre-lab question" given is:

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"The volume of an unknown liquid is 15 ml, and the mass of the liquid and the graduated cylinder it is in is 55.2g.   If the mass of the graduated cylinder is 44.8g , what is the density of the unknown liquid? " .

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Note:  The volume of the unknown liquid is 15 mL ;  regardless of whether or not the "unknown liquid" is in the graduated cylinder.

The density of the unknown liquid is measured in:  "g / mL " ;  

  that is, "grams per mL" .

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Note:  "D = m / V " ;   that is;  "Density  = mass/ volume" ;

                                  that is:   ["Density = mass per 'unit volume' ]" .

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So;  to find the density, "D" , of the "unknown liquid" ;  we would have to find the "mass" of the "unknown liquid" by "subtracting" :

       the "known mass of liquid when the liquid is not in the cylinder";  that is:  " 44.8g" ;  From:

       the "known combined value of the: 'mass of the liquid PLUS the mass of the cylinder" ;  that is:  "55.2g" ;

→     " 55.2g - 44.8g = 10.4g " .

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So:   " D =  m / V " ; (55.2g - 44.8 g) / 15 mL  " ;

              =  (55.2g - 44.8 g) / 15 mL  " ;

              =  (10.4g) / 15mL  ;

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Note that the "Density" =  mass per "unit volume" ;

→ So:  D = m / V ;  in units of:  " g / mL " (grams per millileter) ;

            = (10.4g) / 15mL  ;

             = [ (10.4) / 15 }  g/ mL ;  

            =  0.693333333333333.... g / mL  ;

       →  We round to "2 (two) significant figures" ;

       → since we have:  "10.4 g / 15 mL " ;

             and 15 mL is considered a measured/experimental value;

             and:  10.4g is considered a measured/experimental value;

→  so, the least precise value;  15 mL (has only 2 (two) significant figures ;

      compared to other value:  10.4g (which has 3 (three) significant figures;

→  so we shall round off to 2 (two) significant figures:

             =  0.69 g / mL

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              →  which is our answer:  " 0.69 g / mL " .

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The density of the unknown liquid, expressed as "0.69 g/mL," is found by calculating the mass of the liquid, subtracting the mass of the empty cylinder, and dividing by the given volume. The final answer is rounded to two significant figures to maintain precision.

The given problem involves calculating the density of an unknown liquid, and it can be summarized as follows:

The objective is to find the density (D) of the unknown liquid, given that its volume (V) is 15 mL. The total mass of both the liquid and the graduated cylinder is 55.2 grams, and the mass of the empty graduated cylinder is 44.8 grams. To determine the density, we utilize the formula D = mass (m) / volume (V), which is essentially defined as "mass per unit volume."

First, we find the mass of the unknown liquid by subtracting the mass of the empty cylinder (44.8g) from the combined mass of the liquid and the cylinder (55.2g), resulting in a mass of 10.4g.

Then, we calculate the density by dividing this mass (10.4g) by the given volume (15 mL). However, when dealing with significant figures, we consider that the volume measurement has only two significant figures (15 mL), while the mass measurement has three significant figures (10.4g). To maintain consistency, we round the result to two significant figures.

As a result, the density of the unknown liquid is determined to be 0.69 g/mL.

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Answer:

v=m/d =2.3/5.5=0.42

Explanation:

The volume of the screwdriver will be 0.4182 cm³.

We have a screwdriver.

We have to determine the screwdriver's volume.

The following relation exists between the mass and density of any body -

M = ρV

ρ - density of body.

V - volume of body

M - mass of body

According to the question -

ρ = 5.5 g/cm³

M = 2.3 g

Therefore -

V = M / ρ = 2.3 / 5.5 = 0.4182 cm³

Hence, the volume of the screwdriver will be 0.4182 cm³.

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Answer: Sticky and light

After fertilization, female cones become hard.

After fertilization, female cones become hard. This process happens in the life cycle of gymnosperms, where female cones are located in the upper branches of the trees. These cones are fertilized by pollen, which is delivered by the wind from the male cones. The question relates to how these female cones change after they have been successfully fertilized. Following fertilization, the cones, which contain seeds, mature and their scales become woody or hard to protect the developing seeds inside. This hardening process is crucial for the protection and eventual dispersal of the seeds. It contributes to the reproductive success of gymnosperm plants by ensuring that seeds are effectively protected until they are ready for dispersal.

Answer: 0.8g/cm^3

Explanation:

In seeing your problem, I see an issue with your units for centimeter. The volume is in the third dimension, so we use cm^3 every single time for the volume. That way, we can arrive to the correct density (in g/cm^3)

Density = mass/volume and so

Density = 8g/10cm^3

= 0.8g/cm^3

The density of the pumpkin is calculated using the formula density (h₀) = mass (m) / volume (V) and with the values given (8 g for mass and 10 cm³ for volume) the density is 0.8 g/cm³.

To find the density of a pumpkin with a volume of 10 cm³ and a mass of 8 grams, you use the formula density (h₀) = mass (m) divided by volume (V). Since the mass of the pumpkin is given as 8 g and the volume as 10 cm³, you can calculate the density directly.

The formula looks like this : h₀ = m / V

So, plugging in the values :
h₀ = 8 g / 10 cm³
h₀₀ = 0.8 g/cm³

The density of the pumpkin is therefore 0.8 g/cm³.

Final answer:

The electron configuration for the given atoms involves two electrons in the first shell, eight electrons in the second shell, and six electrons in the third shell.

Explanation:

The given information states that there are 2 electrons in the first shell, 8 electrons in the second shell, and 6 electrons in the third shell. From this, we can determine that the subject of this question is electron configuration. The electron configuration is the distribution of electrons in the various energy levels or shells around an atom's nucleus. In this case, the electron configuration can be represented as 2 electrons in the first shell (n=1), 8 electrons in the second shell (n=2), and 6 electrons in the third shell (n=3). So, the correct answer is shells 1 and 2 are full, and shell 3 has nine electrons.

Answer:

A positively charged particle is proton which is in the nucleus of an atom.

Explanation:

Francium is the element between Cesium and Radon on the periodic table. It is shiny, malleable, and a good conductor of heat and electricity. Similar metals share these properties, including lithium, sodium, and potassium.

The element described is Francium, found between Cesium and Radon on the periodic table. It belongs to the main-group elements of the metal category which consists of elements that are shiny, malleable, and good conductors of heat and electricity. Francium, with an atomic number of 87, is higher than that of Cesium (55) but lower than Radon (86).

The physical properties of metals include being shiny, malleable, and good conductors of both heat and electricity. These characteristics differentiate metals from other classes of elements such as nonmetals and metalloids. Nonmetals are notable for appearing dull and being poor conductors of heat and electricity, while metalloids exhibit behaviors in between those of metals and nonmetals.

The elements in a similar category to Francium like lithium (Li), sodium (Na), and potassium (K) also share similar properties. They appear shiny, are malleable, ductile, and are excellent conductors of heat and electricity.

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Final answer:

The metallic element mentioned is shiny, malleable, ductile, and conducts heat and electricity, fitting the criteria of metals with atomic numbers between cesium (55) and radon (86).

Explanation:

The element described in the question is a metal. This is because it exhibits characteristics such as being shiny, malleable which can be shaped, ductile which can be drawn into wires, and is a good conductor of heat and electricity. The atomic number of this element is indeed greater than that of cesium, which is 55, and less than that of radon, which is 86.

Without additional context, there are multiple elements which fit these characteristics, including gold (atomic number 79), silver (atomic number 47), and copper (atomic number 29). All these metals share the properties described and fall within the specified range for atomic numbers, between cesium and radon.

Answer:gas<liquid<solid

Explanation:

Density is defined as mass per unit volume of a substance.Solids have higher density whereas liquids have lower density.For ex-density of iron is greater than water. In increasing order of density of different states of matter = gas<liquid<solid

a) Answer:

Number of molecules in 1 mole

Explanation:

a) Whether we take any of the substance among all three of the given substances they will have the same number of molecules in 1 mole of the substance is considered and the value for this will be [tex]6.023 x 10^23[/tex]

b)  Answer:

In the given question mass of the substance which is greatest is asked for one mole and we also know that mass of one mole is given by molar mass.  

Explanation:

b) It is known that [tex]31.98g/mol[/tex] is the molar mass for oxygen which is greater than that of hydrogen while fluorine has a molar mass of [tex]38.0 g/mol[/tex] which on comparison shows that, it is the highest amongst all three.

All three substances (H2, O2, and F2) have the exact same number of molecules in 1 mole due to Avogadro's number of 6.022 x 10^23. The molar masses define the total mass of 1 mole of any element, with F2 (Fluorine) having the highest molar mass and thus the greatest mass in 1 mole.

Comparing 1 mole of H2, 1 mole of O2, and 1 mole of F2, the first thing to know is that one mole of any substance contains the same number of entities (atoms, molecules, ions, etc.), known as Avogadro's number, which is 6.022 x 10^23. Hence, all three substances (H2, O2, and F2) contain the exact same number of molecules if you have 1 mole of each.

When comparing the masses of 1 mole of H2, O2, and F2, we consider the molar masses. The molar mass of an element (in g/mol) is numerically equal to the element’s atomic weight. Therefore, the molar mass of H2 (Hydrogen) is 2 g/mol, O2 (Oxygen) is 32 g/mol, and F2 (Fluorine) is 38 g/mol. So, 1 mole of F2 has the greatest mass because it has the highest molar mass.

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Answer:

If you add the masses of all the products after fission, they are LESS than the mass of the reactants.

Explanation:

A nuclear fission reaction is a radioactive reaction which in which a heavy nucleus spontaneously disintegrates into 2 lighter nuclei and some neutrons with a release of large amount of energy.

When nuclear fission occurs, a mass deficit between the decaying nuclei and the product occurs. It is this mass that actually yields the energy that is produced as a by product of the reaction.

Answer:

Mass

Explanation:

Answer:

The answer to your question is: below

Explanation:

Reaction with water, sodium is very reactive, sometimes explosive with water, so we can identified it from the other metals. Magnesium is less reactive than sodium, but in the presence of water it can produce bubbles.

Then we can identify copper and stainless steel because of the shine and they conduct electricity (conductivity).

Answer:

A. The increase in the mass of the magnesium oxide was due to oxygen atoms in the air.

Explanation:

Burning occurs in the presence of oxygen. A chemical combination occurs between Mg and O in that the atom of magnesium attracts one another.

          Mg + O₂ → MgO

Starting with the magnesium, on reacting with oxygen a new compound forms. This is why there is mass increase in the MgO compared to the starting material.

Answer: A. The increase in the mass of the magnesium oxide was due to oxygen atoms in the air.

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical equation for burning of magnesium in air is:

[tex]Mg(s)+O_2(g)\rightarrow 2MgO(s)[/tex]

When magnesium combines with oxygen, the mass of magnesium oxide formed will be same as the sum of masses of magnesium and oxygen.

Thus the increase in the mass of the magnesium oxide was due to oxygen atoms in the air.

Answer:

The error in the statement of there is the increase in amount of energy is talking about.

Explanation:

In the given experiment two ball that is present has potential energy and is static in a place, were the club that hates the ball has a certain amount of kinetic energy present in it.

After hitting the ball that kinetic energy transferred to the ball while the club becomes constant. Hence there is only a transfer of energy that is taken place the overall energy of the system remains same, So no increase or decrease is observed in the system .

A chemical symbol uses two or one letter to depict the elemental atom in a periodic table or the reaction. The symbols Na (sodium) and F (fluorine) represent the atom. Thus, option A is correct.

An atom is said to be the fundamental unit of the element that makes the molecule or the compound through chemical and intermolecular bonding. It is a matter that defines the specific element.

The atoms of the different elements are expressed by the chemical symbols, atomic numbers, and atomic masses. The symbol contains one or two letters of the alphabet that mostly resembles the name of the element. Na is a chemical symbol that resembles the atom of the sodium element, whereas F represents the atom of the fluorine element.

Therefore, in option A. the chemical symbols like Na and F represent an atom.

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Answer:

4NH3 + 5 O2  →  4 NO  + 6 H2O

Explanation:

The formula of ammonia is NH3. Oxidise  means adding 02. This will result in Nitrogen(II)oxide which is NO, and H20.

On the left side we have 3xH and on the right side we have 2x H. To get the same amount we multiply the left side bij 2 and the right side by 3.

This gives us 2N on the left side, so we multiply NO by 2, to get the same amount of N.

This gives us 5x O at the right side, so to get the same amount we multiply O2 by 5/2 ( we already got 2x O).

This gives us 2NH3 + 5/2 O2  → 2NO + 3H20

We multiply by 2 to get rid of fractions, which will give us:

4NH3  + 5 O2  → 4NO + 6H20

Answer:

mass and height (i think)

Explanation:

Answer:

Explanation:

High rate of speed as used by most announcers is actually not correct. Speed is the rate at which distance changes with time. Speed already expresses a rate. What one can deduce is that they probably meant to emphasize more on the how fast a sport is proceeding. Ordinarily saying speed would have been fine.

According to physics, the rate of change of speed is acceleration. Acceleration is the change in velocity with time. A body is said to be accelerating if its velocity is constantly changing.

Final answer:

When sports announcers refer to a "high rate of speed," they typically mean an object is moving quickly. In physics, 'speed' measures how fast an object moves, without direction, and is a scalar quantity. Conversely, 'velocity' includes both speed and direction and is a vector quantity.

Explanation:

When people, especially sports announcers, talk about a "high rate of speed," they are typically referring to an object, such as an athlete or vehicle, moving quickly. However, in physics, speed is a scalar quantity that measures how fast an object is moving without regard to direction, whereas velocity is a vector quantity that includes both the speed and the direction of an object's movement.

Speed can be understood as the rate at which distance is covered over time. To calculate the average speed, you would divide the total distance traveled by the elapsed time. Thus, when someone mentions a "high rate of speed," they likely mean that an object is covering distance rapidly, though they might be unintentionally conflating speed with velocity.

In the context of a race, a higher percentile speed means a faster run. For example, if the 40th percentile of speeds in a race is 7.5 miles per hour, it means that 40% of runners have a speed that is less than or equal to 7.5 miles per hour.

Answer:

The answer to your question is letter b) He and Ne

Explanation:

Elements that have similar properties are placed in the same group in the periodic table.

So

A C and F  These elements do not have similar properties because C is in group 4A and F is in group 7A. This is not the right answer.

B He and Ne  These elements have similar properties becase they are in the same group (8A).

C Al and Si  These elements do not have similar properties because Al is in group 3A and Si is in group 4A. This is not the right answer.

D N and S These elements do not have similar properties because N is in group 5A and S is in group 6A. This is not the right answer.

Answer:

B.) different

Explanation:

Answer:

Option B different

Explanation:

As stated in the question, both sodium and chlorine are dangerous elements which can harm human. However, when they are joined by ionic bond to form sodium chloride. In generic term, sodium chloride is the table salt which is the main mineral constituent of the sea water and it is also a common mineral taken by human. This shows that the ionic bond can create substances which possesses different properties than the elements that created them.

Plastics are artificial materials not found in nature, made from polymers. They're lightweight, resistant to moisture, moldable, and possess high insulation properties, thus are used in many industries.

One example of a material not found in nature is plastic. Plastics are polymers, which are long chains of molecules, created from smaller molecules called monomers. Plastics possess remarkable properties including their light weight, resistance to moisture, and their ability to be molded into different shapes. They also have high electrical and thermal insulation properties. These attributes make plastics an indispensable material in various industries, including packaging, automotive, electronics, and more.

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Plastic is a man-made material with unique properties like durability and flexibility.

Plastic is a material not found in nature that has useful properties such as being lightweight, durable, and easily molded into different shapes. One example is polyethylene, which is commonly used in plastic bags due to its flexibility and strength. Another example is polycarbonate, known for its impact resistance and optical clarity.

Answer:

0.506 g

Explanation:

we know that one miligram is equal to 0.001 g or we can say that  one gram contain thousand miligram. so,

if the mass of drug is 506 mg then to convert it into gram we have to divide 506 mg into 1000.  

Answer:

density of the vase = 8.418 g / mL

Explanation:

Density is equal to mass of the platinum vase divided by the volume of water displaced.

density = mass / volume

density of the platinum vase = 157 g / 18.65 mL = 8.418 g / mL

Final answer:

The density of the vase can be found using the formula ρ = m ÷ V, which with the given mass of 157 grams and volume of 18.65 mL, results in a density of 8.42 g/mL.

Explanation:

The student is asking how to find the density of a vase that seems to be made of solid platinum, given its mass and the volume of water it displaces. The formula for density (ρ) is mass (m) divided by volume (V), so to find the density of the vase, you would use the given mass of 157 grams and the volume of displaced water which is 18.65 mL (which is equal to the volume of the vase).

Therefore, the density of the vase is 157 g ÷ 18.65 mL = 8.42 g/mL.

Comparing this density to reference values for various materials can help to confirm if the vase is indeed made of platinum, as platinum has a density of approximately 21.45 g/cm³ (or 21.45 g/mL).

Answer:

Explanation:

B

Answer: B) grams

Explanation:

Mass is the amount of matter contained in a substance.

It can be measured in units of kilograms (kg), grams (g), milli grams (mg) , pounds etc.These units are interconvertible.

International System of Measurement (S.I.) is the most commonly used system. As we know that there are seven fundamental SI units which are used to find derived units . These are as follows:

1) Mass - Kilogram

2) Length - meter

3) Time - Seconds

4) Electric Current - Ampere

5) Amount of substance - Moles

6) Intensity of light - Candela

7) Temperature - Kelvin

Thus International System of Measurement units used for measuring mass is grams.

Answer:

They increases the distance of applied force(torque)as well as they change the strenght or direction of a force(90 angle work).

Explanation:

Answer:

W=f× d

Increase the distance of applied forces

Explanation:

Increasing the distance between applied forces increases the work done on the machine which makes work easier..they change the direction and strength of the force.

Answer:

3.51 g of oxygen per gram of gasoline is required.

Explanation:

Solution:

First of all we will write the balance chemical equation.

C8H18 + 12.5O2 → 8CO2 + 9H2O

This equation shows that,

1 mole of gasoline react with 12.5 mole of oxygen for complete burning.

mass of one mole of gasoline = 8×12 + 18×1 = 114 g

mass of 12.5 mole of oxygen = 12.5 (16×2) = 400 g

Formula:

mass of oxygen per gram of gasoline = (400 / 114) = 3.51

so, 3.51 g of oxygen require for per gram of gasoline.

Answer:

The answer to your question is below

Explanation:

Atomic mass = 65.39 g

Searching this number in the periodic table we find that the element is Zinc.

Then:

# of Protons = 30

# of neutrons = atomic mass - # of protons

                       = 65.39 - 30

                        = 35.39

# of electrons = # of protons = 30