Which shows the general structure of a carboxylic acid?
O A. R
O-R
R
O R
B. R-O-R
C. R-OH
OD ROH

This problem is referring to an anhydrous salt that is derive from a hydrated Epson salt (magnesium sulfate hydrate) and the atom economy is required. However, not enough information is provided, yet we can use the attached file as a reference to provide a methodology of calculation.

To begin with, we need to calculate the [tex]x[/tex] which refers to the degree of hydration of the salt, so that we use the mass before and after heating the sample to figure out the grams and subsequently moles of water that are in there:

[tex]m_w=3.648g-1.782g=1.866g\\\\n_w=0.103molH_2O[/tex]

Next, since 1.782g corresponds to the anhydrous salt, we calculate the moles in such a amount:

[tex]1.782gMgSO_4*\frac{1molMgSO_4}{120.4gMgSO_4}=0.0148mol[/tex]

Then, we divide the moles of water by those of the anhydrous salt to calculte [tex]x[/tex]:

[tex]x=\frac{0.103mol}{0.0148mol} =6.96=7[/tex]

This means the formula of the hydrate is:

[tex]MgSO_4\ 7H_2O[/tex]

Finally, for the atom economy we just divide the molar mass of the anhydrous salt by that of the hydrate:

[tex]A.E=\frac{120.4g/mol}{246.47g/mol} *100\%\\\\A.E=48.8\%[/tex]

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Answer:

Iron displaces copper ions

Explanation:

which means that iron in more reactive than copper.

(Fe2+) and cupric ion (Cu2 +) is converted into metallic copper. Fe (s) + Cu2 + (aq) —→ Fe2+ (aq) + Cu (s).

Answer:

Particles move faster the farther they are apart, so the container with the most spread out particles.

In the gaseous state, the molecules are completely free because there is no intermolecular interaction between the molecules hence they translate at incredibly high velocity.

According to the kinetic theory of matter, the molecules that compose matter are in constant random motion. The nature of this motion varies in the three states of matter which are;

In the solid state, the molecules do not translate, they only vibrate and rotate about their mean positions. In the liquids state, the molecules translate but they still have restricted degrees of freedom due to intermolecular interactions. In the gaseous state, the molecules are completely free because there is no intermolecular interaction between the molecules hence they translate at incredibly high velocity.

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Answer:

Physical changes can be classified as reversible or irreversible. Melting is an example of a reversible physical change.

Explanation:

Answer:

temperature

Explanation:

its in the book

Answer: agitation

Explanation:

Answer:A

Explanation: I’m pretty sure

Answer:

His map of the ocean floor did not support his theory

Explanation:

Answer:

He didn't know about plate tectonics to explain how the plates moved

Explanation:

Wegener believed the continents had pushed through the ocean floor. However, he did not have a satisfactory explanation for how this happened. There was no known source of energy large enough to move continents through the sea floor. Also, although scientists had data about the interior of Earth from earthquakes, there were no clues in Earth's crust to show that the continents had broken through the sea floor. Given this lack of evidence to explain the mechanism of continental drift, scientists did not accept this idea.

Answer:  Emission spectra

The Emission spectrum can be separated into three types:

A gas of hydrogen atoms will create an absorption line spectrum if it is between you (telescope+spectrograph) and a continuum light source, and also an emission line spectrum if considered from a distinguishable angle.

When The emission spectrum of atomic hydrogen has been divided into several spectral sequences, with wavelengths given by the Rydberg formula.

These experimental spectral lines are due to the electron-making transitions between two energy positions in an atom.

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Answer:

The actinides and the lanthanides

Answer:

The combined number of protons and neutrons remains constant.

Explanation:

= )

I made a really helpful study set for this assignment on Quizlet. Feel free to visit the following if you need help with the rest of this assignment. Thanks and good luck!

Quizlet - "Physical Science - 5.4 Modeling Fusion and Fission Quick Check"

h t t p s : / / q u i z l e t . c o m / 7 3 7 5 5 3 6 8 0 / p h y s i c a l - s c i e n c e - 5 4 - m o d e l i n g - f u s i o n - a n d - f i s s i o n - q u i c k - c h e c k - f l a s h - c a r d s / ? n e w

Answer:

1. Ga

2. O

3. Cl

4. Br

Answer:-

a. Non metals

b. Metals

c. Metals

d. Nonmetal

e. Metalloid

f. Metalloid

g. Metal

h. Nonmetal

i. Metal

j. Metal

k. Nonmetal

l. Nonmetal

Hope this helps you!

Answer:

yes/no

Explanation:

I prefere it refrigerated because it lasts longer in my opinion. but some people keep it out

Answer:

yes.

Explanation:

It does unless you want warm soggy pie.

Answer:

its obviously a chemical change

Explanation: Facts

The addition of the food color in water only causes the change in the cor of water but no new substance is formed. Therefore, the teacher is restarting the physical change.

A physical change can occur when the characteristics of the matter change but the identity does not. Physical changes are classified as: reversible and irreversible. For example, the melting of water is reversible in nature since the melted ice cube will be refrozen.

Physical change can be described as a kind of change where only physical properties of matter such as odor, color, solubility, etc. can change. During physical changes, there is no chemical bonds are broken or formed between atoms of the substance.

The chemical composition as well as the chemical nature of the substance remains unchanged during a physical change.  The molecules of matter can rearrange without changing the internal composition of matter.

Therefore, adding food color to water is a physical change as no new substance formed.

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Answer:

Mg (NO3)2

24 + 2×(14+ 3×16)

24+2×(14+48)

24+2×(62)

24+ 124

=148g

Answer:

The burning of fossil fuels contributes to the addition of greenhouse gases to the atmosphere. These gases trap thermal energy in the Earth's atmosphere.

Answer:

20cm^2

Explanation:

Here, Density= Mass/ Volume

=100/5

= 20 cm^2

Answer:

nitrogen, oxygen and fluorine

An ionic bond is formed through the transfer of one or more valence electrons, typically from a metal to a non-metal, which produces a cation and an anion that are bound together by an attractive electrostatic force.

Fireworks need an oxidizer, fuel, and a chemical mixture to produce the colour in the sky. Therefore, option (A) is correct.

The chemicals which are used in crackers are the main reason for the colours in the sky. The colours in the fireworks come from different compounds which are the binder and the colourant. The colourant chemicals provide the colours in the firework while the binder is the agent that binds the fuel and is responsible to burn up the colourant in the firework.

The colourants in the firecrackers can be generated with the use of various metallic salts. These salts can be defined as iconic compounds which possess an anion or an acid and a cation or a base. The metal salts are responsible for generating intense colours when they are burned.

For example, if use calcium salts in the firework will produce an orange colour, and copper salts will produce a bright blue colour.

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Boiling point, surface tension and vapour pressure is the list that includes only bulk properties of matter.

Bulk matter refers to those materials that contains large numbers of atoms, molecules, or ions. Its can be present into all states of matter that may be solid, liquid or gas.

Boiling is a bulk process and occurs throughout the liquid as well as surface tension and vapour pressure is also bulk properties of matter so we can conclude that boiling point, surface tension and vapour pressure is the list that includes only bulk properties of matter.

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Answer:

Lithium nitride. Trilithium nitride. 26134-62-3. Lithium nitride (Li3N) Li3N.

When radioactive decay occurs, the original nucleus splits into daughter nuclei and the resulting nucleus is more stable than the original nucleus. The nucleus can be of a different element than the original.

Unstable nuclei often undergo radioactive decay. In a radioactive decay, the unstable nucleus is broken up into other nuclei. Usually, the nuclei formed during radioactive decay are smaller in mass compared to the original nucleus.

Also, the resulting nucleus is more stable than the original nucleus. The nucleus can be of a different element than the original.

Answer:

radiation travels from its source in the form of energy waves or energized particles

Explanation:

radiation is energy

Answer:

the charge or oxidation number on the cation and anion.

Explanation:

The factor that governs the formula of an ionic compound such as Ca3N2 is the charge or oxidation number on the cation and anion.

In the example, Ca has a +2 charge, N has a -3 charge

So we need 3 x ( +2) to balance 2 x (-3) and have an electrically neutral compound, so

+6 -6 =0

The factor that governs the formula of an ionic compound such as Ca₃N₂ is charge.

Those compounds in which ionic bond is present between the cation and anion is known as ionic compound.

The most important factor that is essential for the formation of ionic compounds are charge i.e. positive charge and negative charge. In the given compound Ca₃N₂, Calcium (Ca) is present in the +2 oxidation state and Nitrogen is present in the -3 oxidation state. So due to attraction between these charges they make a ionic compound.

Hence charge is important factor.

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246800 tons of sulfur dioxide was emitted by the utility company who burned 6.17 million tons of coal.

6.17 million tons of coal contain 2.00% sulfur, hence the weight of sulfur is:

Weight of sulfur = 2% of 6.17 million tons = 0.02 * 6170000 = 123400 tons

123400 tons of sulfur is found in 6.17 million tons of coal

The weight of sulfur dioxide is twice that of sulfur, hence:

Amount of sulfur dioxide emitted = 2 * 123400 tons  = 246800 tons

246800 tons of sulfur dioxide was emitted.

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The mass of magnesium cyanide needed to prepare the solution is 1.57 g

We'll begin by calculating the number of mole of Mg(CN)₂. This can be obtained as follow:

Volume = 275 mL = 275 / 1000 = 0.275 L

Molarity of Mg(CN)₂ = 0.075 M

Mole = Molarity x Volume

Mole of Mg(CN)₂ = 0.075 × 0.275

Mole of Mg(CN)₂ = 0.020625 mole

Mole of Mg(CN)₂ = 0.020625 mole

Molar mass of Mg(CN)₂ = 24 + 2(12 + 14) = 76 g/mol

Mass = mole × molar mass

Mass of Mg(CN)₂ = 0.020625 × 76

Mass of Mg(CN)₂ = 1.57 g

Therefore, 1.57 g of Mg(CN)₂ is needed to prepare the solution

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