PLEASE ANSWER ASAP!
For her school Science ft Alyssa designs an experiment to learn more about
erosion. Her experimental set up is shown below
Using the illustration shown above, determine which of the following statements best
describes the independent variable itest variable). this experiment:



A The speed she pours the water, since it is the same for all trials.

B The amount of water she pours, because the amount she pours is the same.

C The height of the tray, because this is a change that may cause and effect on the experiment.


D The mass of sand that collects at the bottom of the tray, because this is what is being measured or observed.

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\ [/tex]

So we have

[tex]volume = \frac{220}{11} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

Electrons

Explanation:

Explanation:

Explanation:

The problem basically wants you to find a way to convert between the number of atoms present in the sample and the number of moles they are equivalent to.

To convert between atoms and moles we use something called Avogadro's constant, which basically acts as the definition of a mole.

More specifically, in order to have one mole of an element you need 6.022⋅1023 atoms of that element. You can thus use this number as a conversion factor to take you from atoms to moles or vice versa.

In your case, you will have

Answer:

[tex]2.13\%[/tex]

Explanation:

Quantity of copper measured by a student = 4.6 grams

Original quantity of copper = 4.7 grams

Error in measurement = Original quantity of copper - Quantity of copper measured by a student  [tex]=4.7-4.6=0.1[/tex] grams

To find the percent error, apply the following formula:

Percent error = (Error in measurement / Original quantity of copper) × 100

[tex]=\frac{0.1}{4.7}(100)=2.13\%[/tex]

Answer:

10 electrons

Explanation:

The easiest way to do this is to simply look at the periodic table, find the atomic number of magnesium, and subtract 2 from it. The reason this works is that the atomic number tells you how many protons an element has. If we want the element to be neutral, then by definition it will have the same number of electrons.

Answer:

10 Valence Electrons

Explanation:

Easiest thing to do is to look at your periodic table :)

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

From the question

mass = 1.8 kg

volume = 0.2 L

We have

[tex]density = \frac{1.8}{0.2} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

knkjhhg

Explanation:

Answer:

d

Explanation:

Answer:

Protons give the atomic number

Explanation:

Answer:

80

Explanation:

W know that, the atomic no of lead (Pb) is 82. The no of protons is equal to the atomic no.

No of protons = 82

It has a charge of +2. It means that its lacks 2 electrons. No of electrons is :

e = 82-2

e = 80

Hence, Pd will have 80 electrons now.

Answer:false

Explanation:

Answer:

Explanation:

Definition of Prokaryote. a single-celled organism (such as bacteria) that lacks a nucleus and cannot be seen with the naked eye. Examples of Prokaryote in a sentence. 1. The scientist studied the prokaryote under the microscope to see if its single-cell would multiply in certain conditions.

Hope this helps!

Prokaryotes are a single celled organism that is microscopic. They do not have a distinct nucleus with a membrane. They don't have other specialized organelles either. They also include bacteria and archaea.

"Prokaryotes are so small you cant see them with the bare human eye!"

[tex]\boxed{I\;hope\;it\;helps!}[/tex]

<3

Answer:

for the second one i'd go with reflection

Explanation:

Answer:

They are all in Group 11.

Explanation:

Look at the periodic table!

The elements gold, silver, sodium, aluminum are all metals. Gold and silver is transition metals. Sodium is in s  block and  aluminum is a p block elements in periodic table.

Metals are electropositive elements able to conduct electricity and because of the presence of a pool of free electrons.

Metallic elements forms ionic bonds with non-metals. Gold and silver are transition metals or d-block elements. They are highly conducting and silver is a common component in electrical devises.

Aluminum is a p-block element it is in 13th group and sodium is a first group element and is called as an alkali metal. Hence, all the given elements are metals.

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Answer:

Explanation:

The distance covered by an object given it's velocity and time taken can be found by using the formula

From the question

speed = 2 m/s

time = 60 s

We have

distance = 2 × 60

We have the final answer as

Hope this helps you

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

We have

[tex]density = \frac{10}{5} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

12 grams

Explanation:

For any radioactive substance

the amount of substance left after n half life  is given by = [tex]x/2^n[/tex]

where x the original amount of substance.

____________________________________________

Half life of isotope Np-238 = 2 days

total no of days = 6

no of half life =total no of days/Half life of isotope Np-238 = 6/2 = 3

thus,

for our problem n = 3

initial amount of Np-238 = 96 grams

thus,

the amount of substance left after 3 half life = 96/2^3 = 96/8 = 12 grams.

Thus, 12 grams will be left after six days.

Answer:

kinetic energy

Particles in solids are always vibrating (moving back and forth) in place. The vibrational motion of particles in solids is kinetic energy. Heat makes the particles in a solid vibrate faster, giving them more kinetic energy.

Explanation:

The kinetic molecular theory of the states of particles describes the behavior, shape, motion, and observable properties. The particles of solids vibrate in a fixed position. Thus, option D is correct.

The kinetic-molecular theory was given for the states of matter and to show the movement and composition of the particles of the solids, gases, and liquids. It shows their motion respective to the phases and effects of various factors.

In kinetic-molecular theory, the solid particles are explained based on behavior and motion. It states that the solids have the least amount of kinetic energy in them due to their dense packaging. The solids are fixed in a place and show the back-and-forth vibration that is possible due to the least distance.

Therefore, option. the solid particles only vibrate at a fixed location.

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Your question is incomplete, but most probably your full question was, According to the kinetic-molecular theory, gas particles, liquid particles, and particles of a solid all experience some type of motion. Which statement best describes the motion of particles of a solid?

A. They are motionless and in fixed positions.

B. They move slower and are farther apart than the particles of a liquid.

C. They are in greater disorder than the particles of a liquid.

D. They vibrate about fixed points.

Answer:

e.  89

Explanation:

The mass number is the number of protons and neutrons in an atom.  It doesn't include electrons.

43 + 46 = 89

Answer:

denaturing

Explanation:

enzyme denatures in extreme temperature and pH

Answer:

Denaturation

Explanation:

It change the shape of enzyme . It also occur in only high temperatures

Answer:

sea water

Explanation:

Answer:

Gravity

Explanation:

According to Newton's Law of Gravity, an object with mass will attract another object with mass.

They're made up of three main parts: protons, neutrons and electrons. Think of the protons and neutrons as together forming a “sun”, or nucleus, at the centre of the system. The electrons orbit this nucleus, like planets. If atoms are impossibly small, these subatomic particles are even more so.

Answer:

Li2S> Na2S> K2S> CsS

Explanation:

The lattice energy of ionic species depends on the relative sizes of ions in the ionic compounds. As the size of ions increases, the lattice energy decreases and vice versa.

When the size of the anions are the same, the lattice energy now depends on the relative sizes of the cations. Therefore, since all the compounds are sulphides and the order of magnitude of ionic sizes is: Li^+ < Na^+ < K^+ < Cs^+.

Therefore, the order of decrease in lattice energy is; Li2S> Na2S> K2S> CsS

Answer:

If a liquid is heated the particles are given more energy and move faster and faster expanding the liquid.

The distance between the particles increases tremendously the attraction doesn't change.

Whilst water is boiled, the heat energy is transferred to the molecules of water, which begin to pass extra quickly. ultimately, the molecules have an excessive amount of power to stay connected as a liquid. while this takes place, they shape gaseous molecules of water vapor, which go with the flow to the floor as bubbles and tour into the air.

On heating, their kinetic electricity pushes neighboring atoms or molecules other than each different. This pushing of atoms or molecules outcomes in a slightly accelerated distance among molecules and the volume of stable additionally increases.

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Answer: The third one, changes can occur to physical properties but the chemical composition remains the same.

Explanation: Chemical changes change the chemical composition. Physical changes do not.