calculate+the+empirical+formula+from+the+given+percent+compositions.+82%+nitrogen+(n),+18%+hydrogen+(h)

There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. In ionic bonds, electrons are completely transferred. The formula resulting from  Ca²⁺ and Br⁻ ions  is CaBr₂.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion. Ionic bond is stronger than covalent bond. Melting and boiling point of compounds are higher than covalent compounds.

Ionic compounds are formed by cation and anion. Ca²⁺ is cation and  Br⁻  is anion. One ion of Ca²⁺ needs tow ions of Br⁻  to neutralize the overall charge of the compound.

Therefore, the chemical formula resulting from  Ca²⁺ and Br⁻ ions  is CaBr₂.

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Answer:

7.92 g/mL.

Explanation:

The following data were obtained from the question:

Mass of Iron = 28.5 g

Volume of water = 45.5 mL

Volume of water + Iron = 49.1 mL.

Density of Iron =.?

Next, we shall determine the volume of the iron. This can be obtained as illustrated below:

Volume of water = 45.5 mL

Volume of water + Iron = 49.1 mL.

Volume of iron =.?

Volume of iron = (Volume of water + Iron) – (volume of water)

Volume of iron = 49.1 – 45.5

Volume of iron = 3.6 mL

Finally, we shall determine the density of iron as follow:

Mass of Iron = 28.5 g

Volume of iron = 3.6 mL

Density of Iron =.?

Density = mass/volume

Density = 28.5/3.6

Density = 7.92 g/mL

Therefore, the density of the iron is 7.92 g/mL

Answer:

+2

Explanation:

I just looked it up, but it says the Alpha Particle charge is +2 so I hope that helps.

Answer:

+2e

Explanation:

edge 2020

When doubling the number of the moles of the HCl decrease the rate of HCl production because the acid convertase enzyme is converting HCl back into H⁺ and Cl⁻.

The reaction is as follows :

H⁺  +  Cl⁻  ⇄ HCl

If we double the number of the moles of the HCl , it decreases the rate of the HCl production because of the reason that  the acid convertase enzyme is converting the HCl back into the H⁺ and Cl⁻. The purpose of the  enzyme is to allow the conversion of the reactant to the product and the product back to the reactant

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The density of the shot put can be given as 24.2 g/cm^3.

We know that the density is obtained as the ratio of the mass to the volume of the object. We know that the volume is an intrinsic property hence it can be used to be able to obtain the properties of the material that is in question

Now we have some information about the material that has been discussed in the question. We are told that the mass of the object is 7250 grams and the volume of the object is 300.0 cm3.

Given the fact that we have these parameters about the question, we can now be able to obtain the density of the material by the use of the formula that can be applied for density as;

Density = mass/volume

Density =7250 grams/ 300.0 cm3

= 24.2 g/cm^3

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Polar endotherms must save heat, hence they usually have a significant surface area to volume ratio. The capacity to maintain blood is what makes heat conservation unique.

Vasoconstriction keeps it in the centre by decreasing blood flow to the outside (also known as peripheral vasoconstriction). An endotherm is an organism that uses heat produced by its internal biological processes rather than nearly exclusively relying on ambient heat to keep its body at a metabolically advantageous temperature. In thermodynamics, heat is defined as a kind of energy that crosses a thermodynamic system's boundary due to a temperature differential across the barrier. Heat is not present in a thermodynamic system.

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The following actions describe deposition as flowing soil or mud due to gravity. Option D.

Sedimentation is the accumulation of sediments carried by the wind running water sea or ice. Sediments are carried as pebbles sand mud, or dissolved salts in water. A deposition is the direct transition of a substance from the gaseous state to the solid state on cooling without going through the liquid state.

Sedimentation is the geological process in which sediments soils and rocks are added to form landforms or land masses. Wind ice water and gravity cause previously weathered surface material to deposit and lose sufficient kinetic energy within the fluid to form a layer of sediment. Several factors influence how sediment settles. Sediment is removed from new surface locations. Precipitation is the change of state of a gaseous substance into a solid.

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Answer:

12

Explanation:

Answer:

2.66 · 10⁵

Explanation:

There are 1440 minutes in a day. Which means that there is 266400 minutes in 185 days. And in scientific notation it is: 2.66 · 10⁵.

Answer:

1. Crush the sugar into powder.

2. Heat the water.

3. Dissolve it by stirring continuously

Explanation:

1. Crushing the sugar into powder increases surface area. So it increases the changes of dissolving

2. Heating the water increases the capacity of water to dissolve sugar.

3. Stirring continuously increases randomness of particles so eases mixing up thus increasing dissolving tendency.

Answer:

Explanation:

Q1

According to The Ideal Gas Equation :

Q2

Q3

Q4

Answer:

mass to moles:moles in 84.6 g of CO2

the throwing back of your body or surface of light,heat,or sound without absorbing it.

Explanation:

"the reflection in a mirror"

Answer:

abrupt change in the direction of propagation of a wave that strikes the boundary between different mediums. At least part of the oncoming wave disturbance remains in the same medium. Regular reflection, which follows a simple law, occurs at plane boundaries

Crystalline solids differ from amorphous solids in that crystalline solids have sharp melting points and diffract x- rays .

The main difference in amorphous solid and crystalline solids are given as ,

Crystalline solid

Amorphous solids

A covalent crystal of network solids is held together by the covalent bond that can be seen in the structures of diamonds, graphite, silicon dioxide, etc. Therefore, the network solids are held by the covalent bonds.

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NH₃ has a higher boiling point compared to CH₄ as NH₃ can form hydrogen bonds, while CH₄ cannot. Similarly, CS₂ has a higher boiling point than CO₂ as it can form London dispersion forces, and NO₂ has a higher boiling point compared to CO₂ as it can form dipole-dipole interactions and London dispersion forces.

a. NH₃ has a higher boiling point than CH₄. This is because NH₃ has a stronger intermolecular force of attraction (hydrogen bonding) than CH₄, which has only weak van der Waals forces.

b. CS₂ has a higher boiling point than CO₂. This is because CS₂ has a larger molecular size and more polarizability than CO₂, leading to stronger van der Waals forces between molecules.

c. NO₂ has a higher boiling point than CO₂. This is because NO₂ has a dipole moment due to its polar covalent bonds, which results in stronger intermolecular forces of attraction compared to CO₂, which has only nonpolar covalent bonds.

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Answer: Try mass that’s the best guess I can give off the top of my head

Explanation: An atom is the smallest unit of matter that retains all of the chemical properties of an element. Atoms come together which forms molecules. These molecules interact to form solids, gases, or liquids.

FALSE. The presence of a plaster ring does not affect the available volume for box fill calculations.

When a plaster ring is installed on a four-inch square junction box, it does not increase the available volume for the purposes of calculating box fill. The volume of the junction box remains the same regardless of the presence of a plaster ring.

The purpose of a plaster ring is to provide a surface for attaching the box to a wall or ceiling and to help protect the electrical wiring and connections within the box. It does not alter the internal volume of the junction box.

The volume of a junction box is important for determining the number and size of wires and devices that can be safely installed within the box while complying with electrical code regulations. The box fill calculation considers the internal dimensions of the junction box itself and does not take into account any external attachments or accessories like plaster rings.

Therefore, the presence of a plaster ring does not affect the available volume for box fill calculations.

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Answer:

B. Wall applies equal reaction force on hand

Explanation:

This is newton's third law. You push something, that something pushes you back with same force. The direction is opposite, so if I push a wall, the wall pushes me back with same force just in opposite direction (so wall towards me). This is why option A is incorrect b/c it says force in same direction as wall. C and D talk about unequal force which is incorrect.

Answer:Wall applies equal reaction force on hand

Explanation:

Answer:

Answer

Explanation:

Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed. ... This distribution of fossils led to theories that the southern continents were once joined in a supercontinent called Gondwana.

Answer: Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed.

Explanation: I hoped that helped plzz mark as brainliest !!

1. and C.

Terrycot is a fiber that is made by mixing two fibers. Terrycot is a blended fabric made of terylene and cotton. It has better absorbing power as compared to Terylene. Nylon and terylene are produced through condensation polymeriztation.

Hope it helps...

Answer:

Explanation:

1-B

2-A

3-D

4-C

The relative atomic mass for pivotium is 417.9 amu. The ratio of the average mass of atoms of a chemical element in a particular sample to the atomic mass constant is known as relative atomic mass.

Multiply the mass by the % written as a decimal and add the result.

426X0,11 + 417X 0.89 = 417.99 or 418

check 90% is. 417 only 10% 426

417X.9 +(426X0.10)=417.9

The ratio of the average mass of atoms of a chemical element in a particular sample to the atomic mass constant is known as relative atomic mass (symbol: Ar; sometimes abbreviated RAM or r.a.m. ), also known by the deprecated synonym atomic weight.

While absolute mass is the total mass of the protons and neutrons, relative mass is the average atomic mass of all the isotopes present as a percentage. For instance, the average atomic mass of carbon based on the fraction of C-12, C-13, and C-14 isotopes is 12.01 but the absolute mass of carbon is 12.0 amu.

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The number of moles of PbSO₄(s) precipitated from the resulting solution would be 0.0141 moles.

A precipitation reaction will take place in which the Na₂SO₄(aq) and Pb(NO₃)₂(aq) will react and form PbSO₄(s) solid and NaNO₃(aq).

This is the balanced chemical reaction that takes place:Na₂SO₄(aq) + Pb(NO₃)₂(aq) → PbSO₄(s) + 2NaNO₃(aq)

We first need to determine the number of moles of Na₂SO₄(aq) that is available:0.0200 L × 0.00187 mol/L = 3.74 × 10⁻⁵ mol Na₂SO₄(aq)

Since the reaction has a 1:1 molar ratio between Na₂SO₄(aq) and PbSO₄(s), the number of moles of PbSO₄(s) that will form will be the same.

Therefore, 3.74 × 10⁻⁵ mol PbSO₄(s) will form.In order to calculate the mass of PbSO₄(s) that will precipitate out, we can use the formula:m = n × MM

where m = mass in grams, n = number of moles, and MM = molar mass of PbSO₄The molar mass of PbSO₄ is:1 Pb + 1 S + 4 O = 207.2 g/molSo, mass of PbSO₄(s) = 0.00775 g

We can use the solubility product constant (Ksp) to determine if all of the PbSO₄(s) will precipitate out.Ksp = [Pb²⁺][SO₄²⁻] = 2.5 × 10⁻⁸[Pb²⁺] = [SO₄²⁻] = xMoles of Pb²⁺ and SO₄²⁻ = 0.0141 mol

The molarity of PbSO₄(s) is thus:0.0141 mol ÷ 0.051 L = 0.276 M

This is greater than the Ksp of 2.5 × 10⁻⁸, so not all of the PbSO₄(s) will precipitate out.

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Answer:

Volumetric cylinders and volumetric carafes are utilized to gauge volume of fluids contained in them.

Explanation:

Volumetric cylinders and volumetric carafes are utilized to gauge volume of fluids contained in them. They are adjusted for volume remembered for them - this is shown by the checking "IN". The fluid has precise volume when it arrives at the comparing stamping on the scale. Volume is generally demonstrated in ml.  

There are numerous instruments that researchers use to gauge explicit volumes, including a graduated chamber, buret, or pipette.

The periods of warming and cooling that the Earth has been through in the past are known as climate cycles or glacial-interglacial cycles.

During a warming event, we would expect the climate on Earth to be generally warmer, with a higher concentration of greenhouse gases in the atmosphere and higher sea levels due to melting ice caps. This could lead to more extreme weather patterns, including more frequent and intense heatwaves, droughts, and hurricanes.

During a cooling event, we would expect the climate on Earth to be generally colder, with lower concentrations of greenhouse gases in the atmosphere and lower sea levels due to expanding ice caps. This could lead to periods of widespread glaciation and colder temperatures, which could have significant impacts on ecosystems and human populations.

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Answer:

4

Explanation:

If an electron shell can hold a maximum of 32 electrons the value of n = 4

Answer:

59.46 g

Explanation:

To answer this question, the molecular weight of ammonium sulfate must be computed.  To accomplish this, the weights of the individual elements must be noted.
N=14.01\(\frac{g}{mol}\)

H=1.01\(\frac{g}{mol}\)

S=32.07\(\frac{g}{mol}\)

O=16.00\(\frac{g}{mol}\)

To compute the molecular weight:

\(2[14.01\frac{g}{mol}+4(1.01\frac{g}{mol})]+32.07\frac{g}{mol}+4(16.00\frac{g}{mol})=132.14\frac{g}{mol}\)

To calculate the mass:

\(0.45 mol(\frac{132.14g}{1mol})=59.463g\)

Answer:

-data collected from Mauna Loa shows an increase in CO2 by 20% in the last 40 years

-ice core data shows links between CO2 and temperature, with a recent increase in both

-data from ice cores and other proxies show increases in CO2, CH4, and N2O since the Industrial Revolution

The concentration of hydroxide ions in the solution is 0.0428 M.

A molecule or atom that has a net electrical charge is called an ion.

The balanced equation for the reaction between HCl and Ca(OH)2 is:

Ca(OH)2 + 2HCl -> CaCl2 + 2H2O

The number of moles of HCl added at the equivalence point can be found by multiplying the volume of HCl added (in liters) by its concentration in moles/liter:

moles HCl = (38.1 mL HCl x 0.028 mol/L HCl) / 1000 mL/L = 0.00107 mol HCl

The concentration of hydroxide ions can be found by dividing the number of moles of hydroxide ions by the volume of the solution:

[OH-] = moles OH- / L of solution

We know that the number of moles of HCl added is equal to the number of moles of OH- present, so:

[OH-] = 0.00107 mol OH- / (25.0 mL / 1000 mL/L) = 0.0428 M

Therefore, the concentration of hydroxide ions in the solution is 0.0428 M.

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