What is the answer to number 14 ?

Answer:

what are stars made of?

Explanation:

that's what google says

Answer:

I think it is b) NOT SURE

Explanation:

Answer:

75kg    

Explanation:

Given:

Force of gravity(F) = 1.85 x 10⁻⁹N

distance between Tim and John = 18m

Mass of Tim = ?

Unknown:

Mass of John = ?

Solution

Newton's law of universal gravitation states that every particle of matter in the universe attracts every other particle with a force that is directly proportional to the product of the masses of the particles and inversely proportional to the square of the distance between them.

i.e                            

                          F =G[tex]\frac{m_{1} m_{2}}{r^{2} }[/tex]

let

                     m₁ represent mass of Tim

                     m₂ mass of John

                    G is the universal gravitation constant = 6.67 x 10⁻¹¹Nm²kg⁻²

                    r is the distance seperating them

The unknown is m₂ and we should make it the subject of the expression:

               m₂  = F [tex]\frac{r^{2} }{m_{1} }[/tex] x [tex]\frac{1}{G}[/tex]

m₂ = [tex]\frac{1.85 x 10^{-9}  x  18^{2}  }{G x 120}[/tex]

m₂ = 75kg      

The total number of electrons that can occupy the d-sublevel is 10.

So, option third is correct one.

learn about subshell,

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To find the grams of Hydrogen in 1.52 grams of acetic acid, calculate the fraction of acetic acid's weight that is made up of Hydrogen (approximately 6.7%), then multiply this by the weight of the acetic acid. Thus, there would be approximately 0.102 grams of Hydrogen in 1.52 grams of acetic acid.

In order to determine the grams of Hydrogen in 1.52 grams of acetic acid, we first need to know the molecular weight of acetic acid (C2H4O2), which is about 60.05 g/mol. Acetic acid has 4 Hydrogen atoms. Each Hydrogen atom has an atomic weight of approximately 1.01 g/mol. Therefore, the total weight of Hydrogen in one molecule of acetic acid is 4.04 g/mol.

Next, we find the fraction of the weight of acetic acid that is made up of Hydrogen by dividing the total weight of Hydrogen by the molecular weight of acetic acid. So, 4.04 g/mol divided by 60.05 g/mol equals approximately 0.067 or 6.7%.

Finally, we multiply the weight of the acetic acid (1.52 grams) by the fraction that is Hydrogen (0.067). That's about 0.102 grams. Therefore, in 1.52 grams of acetic acid, there would be approximately 0.102 grams of Hydrogen.

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Answer:

D and ionExplanation:

An ion is not considered a fundamental particle of an atom; rather, it is an atom or molecule with a net electrical charge. Electrons, protons, and neutrons are the basic atomic particles.

The particle within an atom that does not belong to the list is D an ion. Atoms are primarily composed of three basic particles: A a proton, B a neutron, and C an electron. An ion on the other hand, represents an atom or molecule with a net electrical charge due to the loss or gain of one or more electrons, which is not a fundamental particle of an atom.

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Answer:

Chemical

Explanation:

Chemical changes are when a substance combines with another in order to form a new substance. In this instance the baking powder is reacting which creates carbon dioxide bubbles.

The release of carbon dioxide that results in the rising of bread is an example of a chemical change.

There is always a specific chemical or physical shift that goes along with changes in energy. A natural environment undergoes a variety of changes, including water evaporation, condensation, rainfall, and more. All of these modifications imply a change in state. Some reactions result in the breakdown of existing bonds in the reactants and the formation of new bonds in the products.

Chemical changes occur when the molecular makeup is totally changed and a new product is created. New products are created via chemical modifications. Chemical alterations are both permanent and irreversible.

It demonstrates that modifying or tweaking the experimental modifications cannot undo a chemical change. During a chemical reaction, the substance's mass changes. The mass is either added or subtracted.

Therefore the release of carbon dioxide that results in the rising of bread is an example of a chemical change.

Read more about chemical change, here

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Answer:

Water

Explanation:

A compound can be defined as the bonding of two or more atoms, where at least two are different types of atoms. That is, they are atoms from more than one element. Water fits this definition as it is the bonding between two hydrogen atoms and one oxygen atom, with chemical formula H2O. Iodine and gold are elements and therefore are only single atoms. Sand is classified as a mixture and therefore is not the correct option.

Answer:

A thermometer is the appropiate tool to use.

Explanation:

! !

your answer is !

(A theromometer!)

Hope this helps

Answer:

At the same temperature of 0°C, the density (mass per volume) of ice is 0.9187 gram per cubic centimeter (g cm-3 or g/cm3) while that of liquid water is 0.9998 g cm-3 (Cohen et al. 2003). The lesser density means that ice contains lesser mass (quantity of matter) per unit of volume. It also means that the molecules of water are less compressed per unit volume of ice. Another way of saying it is that ice is less compact than liquid water having the same volume.

Answer:

Volume increase by 8.70% and volume of 500 mL of water when completely frozen is 543 mL

Explanation:

1,000 times the base unit is kilo

1/1,000,000 of the unit base is micro

1/100 of the base unit is centi

1,000,000 times the base unit is mega

1/1,000 of the base unit is milli

1/1,000,000 of the base unit is nano

hope this helps :)

Answer: Decreased kinetic energy of the molecules

The first option that is given in the question is the correct option.

Explanation:

The molecules of a substance act differently at different temperatures but we know that its energy is dependent on the temperature at which it is present. The normal tendency of molecules is to vibrate on move around but, when it absorbs a certain amount of heat it gains more energy and tends to move around faster.

And just the other way round happens when heat is lost so we can say with a decrease in temperature the activity of molecules will also decrease and hence the kinetic energy will be decreased.

Answer:

Increase chemical energy of the molecules

Explanation:

Because once you change temperature it will have a chemistry reaction

Answer:

45.4249 L

Explanation:

E85 is the mixture of gasoline and ethano. It consist of 15 percent gasoline and 85 percent ethanol.

Given data:

volume = 12 gal

density = 0.785 g/ ml

volume in L = ?

Solution:

1 gal = 3.78541 L

12× 3.78541 = 45.4249 L

Answer:

option B= anion (-1)

Explanation:

The halogens are present in the P- block of periodic table. There are thirty five elements present in p-block. The halogens are present in group seventeen. Their are seven electrons are present in valance sheet. All halogens require one electron to complete the octet and form anion carry -1 charge.

Halogens include following elements:

Fluorine, chlorine, bromine, iodine and astatine.

The halogens mostly form single bond with the other elements by gaining one electron and -1 charge. These are most reactive non-metals.

Properties of some halogen elements:

Fluorine:

1. It is yellow in color.

2. It is flammable gas.

3. It is highly corrosive.

4. Fluorine has pungent smell.

5. It's reactions with all other elements are vigorous except neon, oxygen, krypton and helium.  

Chlorine:

1. It is greenish-yellow irritating gas.

2. Its melting point is 172.2 K.

3. Its boiling point is 238.6 K.

4. It is disinfectant and can kill the bacteria.

5. It is also used in manufacturing of paper, paints and textile industries.

Iodine:

1. It is present in solid form.

2. It is crystalline in nature.

3. It is very corrosive and has pungent odor.

4. It can not react with oxygen and nitrogen.

Answer:

Na

Explanation:

To find the limiting reactant we must first write the balanced chemical reaction. It must be correctly balanced so that we can find the proper mole ratios.

2 Na + H₂ → 2 NaH

After this we will convert our measurements to moles. For mass we do this by dividing by the molar mass.

6.75g ÷ 22.99 = 0.294mol Na

3.03g ÷ 2.02 = 1.50mol H₂

Now that we have the moles of each of the reactants, we can multiply them by their mole ratio with a reactant.

0.294mol Na × [tex]\frac{2 Na}{2 NaH}[/tex] = 0.294mol NaH

1.50mol H₂ × 2/1 = 3.00mol NaH

Na is our limiting reagent because it makes the smaller amount of moles.

Answer:

The sun will heat up and expand into a Red Giant star, then heat up to an extreme temperature, explode, and compact into an even hotter white dwarf star.

Explanation:

when our Sun runs out of hydrogen fuel, it will expand to become a red giant, puff off its outer layers, and then settle down as a compact white dwarf star, then slowly cooling down for trillions of years.

Answer:

White dwarf

Explanation:

Sun is a G-2 average mass star. It is 4.56 billion years old and would live for another 5 billion years. When the Sun would run out off fuel, its outer layers would expand and it will form a red giant star. The outer layers would eventually blow off into space and the remaining core would become a white dwarf. White dwarf is an electron degenerate star.

Answer:

A

Explanation:

You always want to make the number two digits, and then multiply by ten to however many zeroz

Answer:

5.6 x 10-5

Explanation:

Final answer:

The percentage of ethylene glycol in the solution is calculated to be 34.21% by mass, which is obtained by dividing the mass of ethylene glycol by the total mass of the solution and then multiplying by 100.

Explanation:

The percentage of ethylene glycol in the solution can be calculated using the mass percentage formula, which is the mass of ethylene glycol divided by the total mass of the solution, then multiplied by 100 to convert it into a percentage. In this case, we have 130 g of ethylene glycol and a total solution mass of 380 g. The calculation would be:

Percentage of ethylene glycol = (Ethylene glycol mass / Total solution mass) × 100

Percentage of ethylene glycol = (130 g / 380 g) × 100

Percentage of ethylene glycol = 0.3421 × 100

Percentage of ethylene glycol = 34.21%

Therefore, the solution contains 34.21% ethylene glycol by mass.

Answer: Acceleration of the ball in the given system is 5 meter per Second Square

The laws of motion are used to determine various aspects of an object in motion.

Explanation:

Applying the first law of motion to calculate acceleration; if formula used in first law is given as [tex]v=u+at[/tex]

Here we have a final velocity as 40 meter per second and initial velocity as 20 meter per second and time span is given as 2 second applying the given values in the given equation and finding the value of a

                            [tex]30=20+a \times 2 = a=5 m/s^2[/tex]

Answer:

Centripetal acceleration is 47 m/s²

Explanation:

It is given that,

Radius of the circle, r = 1.8 meters

The velocity of the ball, v = 9.2 m/s

We have to find the centripetal force of a ball on a string that is whirled horizontally over a boy’s head. It is given by :

So, the centripetal acceleration of the ball on a string is 47 m/s². Hence, the correct option is (E).                        

Answer: divide by 946.353

= 1.58 x 10^-4 or 0.000159

Explanation:

Answer:

¹⁴N isotope

Explanation:

7p⁺  are representing the number of protons in the nucleus

7n° are representing the number of neutrons in the nucleus

7e⁻ are representing the number of electrons

If we add the number of protons and the number of neutrons we get a mass number of 14 which is the atomic mass of the nitrogen-14 isotope.

Answer:

N¹⁴

Explanation:

Each element has its own properties, and those properties can be seen by their atomic number and proton number. However, there are types of atoms called isotopes, and these atoms have a different number of neutrons compared to its standard atom. For example, the standard atom of carbon is carbon-12, however, there are isotopes of carbon that have more neutrons, making them heavier. Examples of such isotopes are carbon-13 and carbon-14.

In this question, we are looking for an atom with has 7 protons and 7 electrons. Scanning the periodic table of elements, we can see that nitrogen is the only atom with 7 protons, hence in a neutral atom of nitrogen, there are 7 protons and 7 electrons. The atomic mass can be calculated by adding the number of protons and the number of neutrons together, so the atomic mass for this isotope is:

Protons + Neutrons = Atomic Mass

= 7 + 7

= 14

The isotope represented by 7p+ 7e-, 7n0 is nitrogen-14 (N¹⁴).

Answer:

Their similarity is that they have the same number of protons. Their difference is that they have different number of neutrons.

Explanation:

They are isotopes of the same element.

Answer:

Explanation:

Kinetic energy is the energy due to changes in position of a body. It is always with regards to motion of a body.

Potential energy on the other hand is the energy at rest of a body.

To estimate kinetic energy, we use the formula:

      K.E =  [tex]\frac{1}{2}m v^{2}[/tex]

where m is the mass of the body and v is the velocity of the object.

mass is 5kg and velocity is 5ms⁻¹

      K.E =  [tex]\frac{1}{2}5 x  5^{2}[/tex]

      K.E = 62.5J

for the object at rest;

    potential energy is calculated:

    P.E = mgh

where m is the mass, g is the acceleration due to gravity and h is the height

m is 5kg, h is 2 and g is 9.8

    P.E = 5 x 9.8 x 2 = 98J

The moving object has kinetic energy with the object  at rest having potential energy.

The moving object has kinetic energy with the object  at rest having potential energy.

Answer:

C

Explanation:

A physical change is when the form of the matter is just altered. While a chemical change results from a chemical reaction. No reaction is happening during the mixing of the two colors [nothing is boiling, freezing, evaporating, melting ext.] , but after you mix them the end result does look different. That only because we changed the physical properties of it.

(B is not a physical change because the baking powder inside of the cake must under go a reaction that causes the cake to rise. )

Answer:

C. A blue liquid and a yellow liquid mix and make a green liquid.

Explanation:

A physical change is a change in which chemically a substance remains the same but a change in state of matter may occur. It is a reversible change i.e. the substance can be converted into the original state even after the change has occurred. As per option c even if a blue liquid has been mixed with a yellow liquid to produce a green liquid we can still separate both the liquids using a physical method of separation to get the original liquids back.

Other options are wrong because they are examples of chemical change in which the change is irreversible and we can never get the original substance back by any means because a reaction has changed the substance entirely.

Answer:

Option C cooking oil is not heterogenous mixture

Explanation:

Mixture is a combination more than two substances and are not chemically combined.

It is of two types Homogenous mixture and heterogenous mixture

Homo means “same”.

Hetero means” different”

Homogenous mixture is a mixture which looks uniform throughout

Examples Cheese, salt solution, air, 18 carat gold

Heterogenous mixture is a mixture which looks non uniform throughout

.Examples Pizza, trail mix, salad, A mixture of oil and water

Answer:

V = 1.2 × 10⁻⁶ m³

Explanation:

Volume is equal to length × width × height, since we are given these measurements in the question we can simply plug our numbers into the formula.

V = l × w × h

V = 1.64 x 10⁻² × 1.5 x 10⁻² × 4.8 x 10⁻³

V = 1.2 × 10⁻⁶ m³

To calculate the volume of a salt crystal, multiply its three dimensions: 1.64 × 10^-2 m, 1.5 × 10^-2 m, and 4.8 × 10^-3 m. The resulting volume is 1.18 × 10^-6 cubic meters. This method uses basic multiplication of the crystal's dimensions.

Volume Calculation of a Salt Crystal

To find the volume of a salt crystal, you need to multiply its three dimensions together. The dimensions provided are 1.64 × 10-2 m, 1.5 × 10-2 m, and 4.8 × 10-3 m.

Here's the volume calculation step by step:

Volume = 1.64 × 10-2 m × 1.5 × 10-2 m × 4.8 × 10-3 m = 1.18 × 10-6 m3

Therefore, the volume of the salt crystal is 1.18 × 10-6 cubic meters.

Answer:

2

Explanation:

The change of state occurs at a constant temperture and pressure. In the grahp we can see while the time passes, the temperature doesn't change.

The rect number 4 correspond to a liquid-gas phase

Answer : The stage 2 shows the substance in both the solid phase and the liquid phase.

Explanation :

In the given phase diagram,

Stage 1 : It shows the solid state of a substance.

Stage 2 : It shows the melting and freezing process of a substance. It means that when the phase changes from solid state to liquid state at constant temperature is know as melting process and when the phase changes from liquid state to solid state at constant temperature is know as freezing process.

Stage 3 : It shows the liquid state of a substance.

Stage 4 : It shows the evaporation and condensation process of a substance. It means that when the phase changes from liquid state to gaseous state at constant temperature is know as evaporation process and when the phase changes from gaseous state to liquid state at constant temperature is know as condensation process.

Stage 5 : It shows the gaseous state of a substance.

Hence, from the above information we conclude that the stage 2 shows the substance in both the solid phase and the liquid phase.

Answer:

V1= 0.305L

Explanation:

To find the initial volume of 1.25M potassium fluoride needed to make tge dilution specified in the question, we can use: C1 × V1 = C2 × V2

Since the question wants the volume in litres, convert 455 mL to L

455/ 1000

= 0.455 L

Now make the substitution

1.25 × V1 = 0.838 × 0.455

Rearrange to make V1 the subject

V1=

[tex] \frac{0.838 \times 0.455}{1.25 } = 0.305 [/tex]

Answer:

0.305

Explanation:

0.305

Answer:

B. mass, volume

Explanation:

Density refers to a physical property that is measured using a ratio of mass divided by volume so that two objects of the same size can still have very different density.

Answer: Option (B) is the correct answer.

Explanation:

Density of a substance is defined as mass divided by its volume.

Mathematically,         Density = [tex]\frac{mass}{volume}[/tex]

So, density is proportional to the mass of substance. Hence, an increase in mass will lead to increase in density of the substance also.

Whereas density is inversely proportional to volume of a substance. Hence, an increase in volume will lead to a decrease in density of the substance.

Therefore, we can conclude that density refers to a physical property that is measured using a ratio of mass divided by volume so that two objects of the same size can still have very different density.

Answer:

V = 43.8cm³

Explanation:

To calculate the volume of the sample we must first make sure the density and mass are in compatiple units. We can do this by changing the density to g/cm³ or the mass to kg.

[tex]\frac{921kg}{1m3}[/tex] × [tex]\frac{1000g}{1kg}[/tex] × [tex]\frac{1m3}{1000000cm3}[/tex] = 0.921g/cm³

Now we can use this and the mass given to get volume.

[tex]\frac{0.921g}{1cm3}[/tex] = [tex]\frac{40.3g}{V}[/tex]

40.3g = (0.921g)(V)

V = 43.8cm³

V = 43.8cm³

Mass per unit volume is known as density.

To calculate the volume of the sample we must first make sure the density and mass are in units. We can do this by changing the density to g/cm³ or the mass to kg.

[tex]921 kg/m^{3} /times\frac{1000\ g}{1\ kg} \times\frac{1\ m^{3} }{1000000\ cm^{3} } =0.921\ g/cm^{3}[/tex]

Now we can use this and the mass given to get volume.

[tex]\frac{0.921\ g}{1\ cm^{3} } =\frac{40.3\ g}{V} \\\\ V=43.8\ cm^{3}[/tex]

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