You bought a magazine for $5 and four erasers. You spent a total of $25. How much did each eraser cost?

A.Carnivore that feeds on primary consumers.

Secondary consumers eat primary consumers. They are carnivores (meat-eaters) and omnivores (animals that eat both animals and plants).

We defined secondary consumers as organisms, primarily animals, which eat primary consumers. Furthermore, secondary consumers can be classified into one of two groups: carnivores, or meat eaters, and omnivores, which are plant and meat eaters.

Answer: prymairy

Explanation:

Answer:

5 electrons

Explanation:

All of them are very reactive.

Two elements have similiar characteristics when they belong to the same family that means that have placed in the same column of the periodic table. So in other words, Helium and Radon are very similar because they are in the same column. Let me know if you need others :)

Some pairs of elements that have similar properties is helium and radon.

The periodic table refers to a tabular display of the chemical elements. It depicts the organized array of all the chemical elements based on their increasing atomic number.

Some pairs of elements that have similar properties is helium and radon. It should be noted that they are both colorless and highly radioactive. They also have a short half life.

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As we move down each chemical family, we are adding electrons to the next larger electron shell.

Thus the atoms become larger as we move down a Group.

Electrons are the subatomic particles with the least mass within an atom. Atoms with varying numbers of neutrons are called isotopes. The increase in atom size down the periodic table is due to more energy levels.Option B is correct.

When comparing the mass of subatomic particles, it is clear that electrons have the least mass compared to protons and neutrons. The masses of protons and neutrons, or nucleons, are very similar to each other, but the mass of a neutron is slightly larger than that of a proton. Almost all of the mass of an atom is concentrated in the nucleus, which contains these nucleons. Therefore, electrons are the subatomic particles with the least mass.

Additionally, atoms that differ in the number of neutrons within their nuclei are known as isotopes. This variation in the number of neutrons does not affect the chemical properties of the element but does result in atoms of the same element having different masses.

As we move down the periodic table, atoms increase in size because they acquire more energy levels, not necessarily because they have more mass, protons, or neutrons.

The number of moles of Nitrogen in 0.209g of N2O is calculated by finding the molar mass of N2O first, then dividing the given mass of the compound by the molar mass. Next, multiply the result by 2 as each molecule of N2O contains 2 atoms of Nitrogen. The answer is 0.0095 moles.

To calculate the number of moles of N in 0.209 g of N2O, we first need to compute the molar mass of N2O. The molar mass of N2O is calculated by adding twice the molar mass of Nitrogen (N) and the molar mass of Oxygen (O). Given that one mole of Nitrogen weighs 14g and one mole of Oxygen is 16g, the molar mass of N2O is<(strong>2 mol nitrogen) (14 g/mol) + (1 mol oxygen) (16.0 g/mol) or 44g/mole.

Next, we calculate the number of moles by dividing the given mass (0.209g) by the molar mass of the compound. Using moles = mass/molar mass, we get moles of N2O = 0.209g / 44g/mole = 0.00475 moles.

Since nitrogen, N, exists as a diatomic molecule in N2O, each mole of N2O contains 2 moles of Nitrogen. Therefore, in 0.00475 moles of N2O, the number of moles of Nitrogen, N will be 2 * 0.00475 = 0.0095 moles.

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Hey there!

Mass = 10 g

Density = 0.7 g/mL

Volume = ?

Therefore:

D = m/ V

0.7 = 10 / V

V = 10 / 0.7

V = 14.28 mL

Hope that helps!

The volume of 10g of gasoline with a density of 0.7g/mL can be calculated using the formula Volume = mass / density. Substituting given values into the formula, the volume is approximately 14.29 mL.

The volume of a substance can be calculated using the formula: Volume = mass / density.

Given that the mass of the gasoline is 10g and its density is 0.7g/mL, you can substitute these values into the formula:

Volume = 10g / 0.7g/mL = 14.29 mL.

So, the volume of 10g of gasoline, given its density of 0.7g/mL, is approximately 14.29 mL.

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The motion of the kinetic molecules slows down

The number of Atoms must be the same on both sides

A chemical equation must always be balanced, meaning it has the same number and type of atoms on both sides, conserving mass according to the law of conservation of matter.

In chemical reactions, for the equation to be accurate and reflect the law of conservation of mass, the number and type of atoms must be the same on both sides of the reaction. This means that the equation should be balanced, with an equal amount of each element's atoms on the reactant side as on the product side. This practice ensures that mass is conserved, as per the law of conservation of matter. An equation for a chemical reaction is said to be balanced if all of the reactants' and products' total charges and the number of atoms in each element are equal. As stated otherwise, there is balance between the mass and the charge on both sides of the reaction.

An example of balancing a chemical equation can be demonstrated with the reaction of ethylene and oxygen to form water and carbon dioxide. One has to revise the coefficients of the substances to balance the atoms of each element, as changing the chemical formulas of individual substances is not allowed.

Thus, for a chemical equation to conform to the law of conservation of matter, the mass of the reactants must equal the mass of the products, and the number of each type of atom in the reactants must match the number in the products.

The answer is Physical Change.

As per the law of conservation of mass, mass can be neither created nor destroyed. For example, in an isolated system the mass of the reactants is equal the mass of the products. In other words, the mass of system will not change over time or through any physical or chemical process.

In this case the initial mass of the board is 750 g. Although the system is physically transformed to sawdust by grounding, the mass or the 'quantity' of the board will remain unchanged. Therefore, mass of the pile of sawdust would be 750 g.

Ans: (a)

Answer:

is D

Explanation:

Normally, the number of electrons is equal to the number of protons, which makes atoms electrically neutral. The number of protons in an atom is the defining feature of an atom. It's what makes one element different from another. The number of protons in an atom is called its atomic number.

Final answer:

Atoms differ from one another based on their atomic number, which is the number of protons in the nucleus. This atomic number determines the chemical properties and identity of the element. Isotopes, atoms of the same element with different numbers of neutrons, have the same atomic number but different mass numbers.

Explanation:

Atoms of one element are distinct from those of another element primarily due to the number of protons, which is known as the atomic number (Z). This is a defining feature that gives each element its unique identity. For instance, all atoms of hydrogen have exactly one proton, while all atoms of iron have 26 protons. Not only do the protons differentiate elements, but they also contribute to the unique properties of each element, such as reactivity or physical characteristics. Furthermore, elements can have isotopes, which are atoms of the same element with the same number of protons but a different number of neutrons, leading to a variance in mass numbers. These isotopes behave similarly in chemical reactions but differ in mass and sometimes nuclear stability.

Isotopes and Chemical Identity

Isotopes are significant in that they are variations of the same element with different neutron counts. An example is carbon, which can have six, seven, or eight neutrons, resulting in different isotopes like Carbon-12, Carbon-13, and Carbon-14, each with unique mass numbers but the same atomic number of six. Even though isotopes of an element have slightly different physical properties, they possess the same chemical properties, which is why they react similarly in chemical processes.

Hey there!

Mass = 43.5 g

Volume = 50 mL

Therefore:

D = m / V

D = 43.5 / 50

D = 0.87 g/mL

Hope that helps!

The mass of the liquid is 4.8 kg.

6.4 L = 6400 mL

Mass = 6400 mL × (0.70 g/1 mL) = 4500 g = 4.8 kg

N is the unit of force. It stands for Newton.

M is the unit of length.

It stands for Meter.

It is the basic difference between the two units N and M.

Answer: N - Newton; M - Meter

Shoutout to: @Sidyandex

why; live

Its D) the suns gravity keeps them in place.

Final answer:

The cathode ray was discovered through experiments by Sir William Crookes and J.J. Thomson. Crookes displayed the first cathode rays and found that they consist of charged particles. Thomson used a cathode ray tube to demonstrate that the rays were actually streams of electrons.

Explanation:

The cathode ray was discovered through various experiments conducted by scientists. In 1878, Sir William Crookes displayed the first cathode rays using a modified Geissler apparatus. He found that the rays could be deflected by magnetic or electric fields, indicating that they consist of charged particles. Later, in 1897, J.J. Thomson used a cathode ray tube to demonstrate that the cathode rays were actually streams of negatively charged particles called electrons.

Answer:- 126.53 g of Si are left.

Solution:- Let's calculate the moles of any of the product from the given grams of the reactants and see which one gives us less moles, that would be the limiting reactant and the other would be the excess reactant.  After this, we could calculate the used amount of the excess reactant and on subtracting this used amount from total given amount, the excess amount is calculated. The calculations are shown below:

[tex]167.00gSi(\frac{1molSi}{28.085gSi})(\frac{4molCr}{3molSi})[/tex]

= 7.928 mol Cr

Similarly the calculations of moles of Cr from other reactant:

[tex]146.00gCr_2O_3(\frac{1molCr_2O_3}{151.99gCr_2O_3})(\frac{4molCr}{2molCr_2O_3})[/tex]

= 1.921 mol Cr

[tex]Cr_2O_3[/tex] gives the less moles of the product and so it is limiting reactant and hence the excess reactant is Si.

Calculations for the amount of Si used to reactant with limiting reactant:

[tex]146.00gCr_2O_3(\frac{1molCr_2O_3}{151.99gCr_2O_3})(\frac{3molSi}{2molCr_2O_3})(\frac{28.085gSi}{1molSi})[/tex]

= 40.47 g Si

Amount of excess reactant(Si) left = 167.00 g - 40.47 g = 126.53 g

So, after the reaction is completed, 126.53 g of excess reactant(Si) are left.

The reaction between Si and Cr2O3 is limited by Cr2O3. When this has all reacted, there are 126.61 grams of Si remaining.

First, we need to calculate the amount of product that can be made with each reactant. Converting grams of reactant into moles allows us to do this. For silicon (Si), the molar mass is approximately 28.09 g/mol, so 167.00 g of Si is equivalent to 167.00 g / 28.09 g/mol = 5.95 moles of Si. For chromium(III) oxide (Cr2O3), the molar mass is approximately 151.99 g/mol, so 146.00 g of Cr2O3 is equivalent to 146.00 g / 151.99 g/mol = 0.96 moles of Cr2O3.

Looking at the balanced equation, we can see that the reaction stoichiometry is 3 moles of Si to 2 moles of Cr2O3. Hence, 5.95 moles of Si can react completely with 5.95 moles Si x (2 moles Cr2O3 / 3 moles Si) = 3.97 moles of Cr2O3. This is more than the 0.96 moles we have, indicating that Cr2O3 is the limiting reactant.

The amount of Si used up is therefore 0.96 moles Cr2O3 x (3 moles Si / 2 moles Cr2O3) = 1.44 moles Si. The remaining excess Si is 5.95 - 1.44 = 4.51 moles. Converting this back into grams gives us 4.51 moles Si x 28.09 g/mol Si = 126.61 g Si.

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Frictional force exists between your sled and the snow and is directed back up the hill!

Hey There!

Given that (NH4)2S is a Strong electrolyte.!!!

(NH4)2S ---> 2 NH⁴⁺ + S²⁻

The equation tells you that you get 2 amonium ions and 1 sulfide ion from each (NH4)2S

Hope that helps!

(NH4)2S is considered a weak electrolyte because it is composed of the ammonium ion, which is the conjugate acid of the weak base ammonia. It does not fully dissociate into ions in solution.

Ammonium sulfide, (NH4)2S, can be considered a weak electrolyte. This is because it is composed of the ammonium ion (NH4+), which is the conjugate acid of the weak base ammonia (NH3). In aqueous solutions, weak electrolytes do not fully dissociate into ions; they establish an equilibrium between the ionized and non-ionized forms. Therefore, like NH4NO3, which is also formed from a weak base, ((NH4)2S) would be expected to only partially dissociate, conducting electricity to a lesser degree than a strong electrolyte would.

Electrons are the part of an atom involved in a chemical reaction, as they determine how atoms interact and form stable compounds through the process of bonding.

In a chemical reaction, the part of an atom that is involved is the electrons. The electrons are located in the electron shells surrounding the nucleus of the atom. It is the movement and redistribution of electrons that drives chemical reactions.

For example, in the process of bonding, atoms can gain, lose, or share electrons to form stable compounds. This is how elements combine to form molecules with different properties.

Overall, the behavior of electrons in the outermost electron shell, known as the valence shell, is crucial for determining how atoms interact and react with each other.

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If I remember correctly the answer would be C.  Electronegativity increases going right from the Alkali Metals to the Noble Gasses with the gasses being the strongest.  Also going up from Ununoctium up to Helium.

There are 1.32 × 10²⁰ atoms in 43.2 mg of gold.

Step 1. Convert grams of Au to moles of Au

Moles of SF₆ = 0.0432 g Au × (1 mol Au/196.97 g Au) = 2.193 × 10⁻⁴ mol Au

Step 2. Convert moles of Au to atoms of Au.

Atoms of Au = 2.193 × 10⁻⁴ mol Au × (6.022 × 10²³ atoms Au /1 mol Au)

= 1.32 × 10²⁰ atoms Au

To find the number of gold atoms in 43.2 milligrams of gold, use Avogadro's number and mole concept.

The mass of a single gold atom is 3.27x10-22 grams. To calculate the number of gold atoms in 43.2 milligrams of gold, you can use the fact that there are 197.0 grams in a mole of gold and 6.022x1023 atoms in a mole.

First, find the number of moles of gold in 43.2 milligrams. Then, calculate the number of gold atoms by multiplying the number of moles by Avogadro's number.

Therefore, the number of gold atoms in 43.2 milligrams of gold would be approximately[tex]1.04 \times10^{19[/tex] atoms.

Given the recursive function g(n) = g(n-1) + n with initial condition g(1)=0, we find g(2) = 2 by plugging n=2 into our equation, resulting in g(2) = g(1) + 2 = 0 + 2 = 2.

A recursive function is a function that calls itself in order to solve a problem. Recursion is a powerful programming technique that is particularly useful for solving problems that can be broken down into smaller, similar subproblems

The given recursive function is g(n) = g(n-1) + n,

with the initial condition that g(1)=0. We're asked to find the value of g(2).

We use the recursive definition to find g(2). Knowing that g(1) = 0, we plug n=2 into our equation: g(2) = g(2-1) + 2 which simplifies to g(2) = g(1) + 2 = 0 + 2 = 2. So, the value of g(2) is 2.

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The following are the matched results:

1.) Compression waves caused by movements in the earth's crust and which radiate outward from the source are Seismic Waves.

2.) The location on the surface of the earth directly above Focus of an earthquake is the Epicenter.

3.) The zone within the earth where rock displacement produces an earthquake is the Focus.

4.) A break in the lithosphere along which bodies of rock can move is called a Fault.

Final answer:

The correct matches are 1: C. Seismic waves, 2: D. Epicenter, 3: B. Focus, and 4: A. Fault. Seismic waves are the waves that emanate from the earthquake's origin, the focus is the origin point itself within the Earth, the epicenter is the direct point above the focus on the Earth's surface, and a fault is a fracture where rocks can move and cause earthquakes.

Explanation:

The correct match for the terms and their definitions related to earthquakes is as follows:

Compression waves caused by movements in the earth's crust and radiate outward from the source of an earthquake: C. Seismic waves

The location on the surface of the earth directly above the focus of an earthquake: D. Epicenter

The zone within the earth where rock displacement produces an earthquake: B. Focus

A break in the lithosphere along which bodies of rock can move: A. Fault

To elaborate, seismic waves (C) are the shock waves coming from the earthquake focus. The epicenter (D) is the point on the Earth's surface located directly above the earthquake focus. The focus (B) is where the rocks start to rupture and displace. Lastly, a fault (A) is where two blocks of the earth move relative to each other and can cause earthquakes when they move.

Le Chatelier principle says, if a restriction is applied to a system in equilibrium, the system adjusts to a new equilibrium that tends to counteract the restriction. When equilibrium is under stress it will shift to relieve that stress.

or

all concentrations would change.

Answer: A system whose equilibrium has been upset will shift to restore equilibrium.

Explanation:

Answer;

= 18.24

Explanation;

The ratio of N and O in the formula NO2 IS 1:2

Mass of nitrogen gas is 0.500 g

Moles of nitrogen will be;

= 0.500/16 = 0.03125 moles

Therefore;

The moles of Oxygen from the ratio will be;

= 0.03125 × 2 = 0.0625 moles

But; 0.0625 moles is equal to 1.140 g of Oxygen

The atomic number (mass in 1 mole) will be;

= 1.140 /0.0625

= 18.24

Thus the atomic number of Oxygen from the data is 18.24

The balanced chemical equation for the given reaction is:

N₂ + 2O₂ → 2NO₂

According to the given balanced equation, 2 moles of O₂ combines with 1 mole of O₂

Given, Mass of O₂ = 1.140 g

Atomic mass of O = 16 amu

Molar mass of O₂ = 16 x 2 = 32 g/mol

Now to calculate the moles of N₂:

1.14 g of O₂ x (1 mole of O₂/ 32 g of O₂) x (1 mol of N₂/ 2 mol O₂) = 0.0178 mol of N₂

Molar mass = mass/ moles  

Given, Mass of N₂ = 0.500 g

Molar mass of N₂ = 0.500 g / 0.0178 mol = 28 g/mol

Atomic mass of N = 28/2 = 14 amu

Therefore, the atomic mass of N is 14 amu