It’s 10pm at 45°W. What time will it be at 45°E?​

Answer:

had this quetionn

Explanation:

B :))

The molar solubility of magnesium oxalate Mg(C2O4 ) in water is 9.3 x 10⁻³ mol/L. So, the correct option is D.

Molar solubility of a substance is defined as the number of moles of solute that can be dissolved to make one litre of a saturated solution.

Here,

The solubility product constant of magnesium oxalate, Ksp = 8.6 x 10⁻⁵

The reaction for dissociation of magnesium oxalate in water can be written as,

MgC₂O₄ + H₂O ⇆ Mg²⁺ + C₂O₄²⁻

Magnesium oxalate is a binary salt.

So,

The molar concentration of  Mg²⁺ = molar concentration of C₂O₄²⁻

[Mg²⁺] = [C₂O₄²⁻] = x

The solubility product constant of MgC₂O₄,

Ksp = [Mg²⁺] [C₂O₄²⁻]

Ksp = x²

Therefore,

Molar solubility of MgC₂O₄,

x = √Ksp

x = √8.6 x 10⁻⁵

x = 9.3 x 10⁻³ mol/L

Hence,

The molar solubility of magnesium oxalate Mg(C2O4 ) in water is 9.3 x 10⁻³ mol/L.

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3CH4 refers to three molecules of a compound  and C3H12 refers to only one molecule of a compound.

3CH4 and C3H12 are actually different molecules though they contain the same number and types of atoms. Recall that both of them are hydrocarbons hence they contain only hydrogen and carbon.

3CH4 refers to three molecules of methane while C3H12 refers to one molecule of diphenyl methane. Hence 3CH4 refers to three molecules of a compound  and C3H12 refers to only one molecule of a compound.

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Answer

Your stomach is a muscular organ that digests food. It is part of your gastrointestinal (GI) tract. When your stomach receives food, it contracts and produces acids and enzymes that break down food. When your stomach has broken down food, it passes it to your small intestine.

Explanation:

Answer:

B

Explanation:

Each chlorine atom has 7 valence electrons. One from each of the Chlorine atoms bonded with one Phosphorous atom, leaving the rest of the pairs, 3 pairs each adding up to six, unbonded

The Lewis dot model of a molecule ( Phosphorous Chloride ) is  each chlorine has three non-bonded pairs and one bonded pair of electrons. Therefore, option B is correct.

Lewis' model demonstrated that, as long as the opportunity cost of labor to the capitalist sector is low, low wages and poverty will continue to exist in a labor surplus economy.

The Richard Lewis model of cultural diversity proposes that all cultures can be divided into three categories: linear-active, multi-active, and reactive. The Lewis model is a triangle made up of these three distinctly different cultural groupings.

The diagrams known as Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.

Thus, option B is correct.

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This problem is describing a gaseous system composed by 12.0 L of nitrogen and 4.00 L of dinitrogen monoxide at 250 K and 0.550 atm. In addition, it is asking for the entropy of the system assuming it is ideal and the volumes are additive; this means we can use the following equation for the entropy of the mixture:

[tex]S_{mix}=-n_{N_2}*R*ln(\frac{n_{N_2}}{n_{N_2}+n_{N_2O}} )-n_{N_2O}*R*ln(\frac{n_{N_2O}}{n_{N_2}+n_{N_2O}} )[/tex]

It means we need to calculate the moles of both gases, which can be obtained by using the ideal gas equation for the common T,P conditions and the volume of each gas:

[tex]n_{N_2}=\frac{PV_{N_2}}{RT} =\frac{0.550atm*12.0L}{0.08206\frac{atm*L}{mol*K}*250K} =0.322mol\\\\n_{N_2O}=\frac{PV_{N_2O}}{RT} =\frac{0.550atm*4.00L}{0.08206\frac{atm*L}{mol*K}*250K} =0.107mol[/tex]

Next, we recall the aforementioned equation for the calculation of the entropy and plug in the values:

[tex]S_{mix}=-8.3145\frac{J}{mol*K}[0.322mol*ln(\frac{0.322mol}{0.322mol+0.107mol} )+0.107mol*ln(\frac{0.107mol}{0.322mol+0.107mol} )]\\\\S_{mix}=2.00\frac{J}{mol*K}[/tex]

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Answer:

15lb

Explanation:

A 15lb pound of turkey will thaw faster compared to 25lb because it's not only smaller but the weight of the turkey affects how temperature circulates throughout.

Hope this helps :)

The turkey weighing 15 lb will thaw faster as it has lesser mass, and required less time.

Thawing has been the process of warming up the substance for converting freezed to a soft liquid and solid. The time required for thawing has been proportional to the energy required to change the substance state.

The turkey has been given of weight 15 lb and 25 lb. The more the weight, there has been more energy has been required for thawing.

Thus, 15 lb turkey will thaw faster as compared to the 25 lb turkey.

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Answer:

Planarian

Explanation:

Answer:

B) water and salt is the result of neutralization reaction

Water and salts are the product of a neutralization reaction.

NEUTRALIZATION REACTION:

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Answer:

I believe it the last one it make the most sense

The first most obvious thing to note is when naming transitional metals, you have to state its charge with roman numerals (except for 1 if I remember correctly). For example, Iron (lll), iron has a charge of 3.

An inorganic acid......

Commonly used mineral acids are sulfuric acid, hydrochloric acid and nitric acid (they are also known as bench acids). Mineral acids range from superacids (perchloric acid) to very weak ones(boric acid). Mineral acids tend to be very soluble in water and insoluble in organic solvents.

Answer: D. 6.2 Na

Explanation: Just took the test

Now

[tex]\\ \sf\longmapsto Q=mc\Delta T[/tex]

[tex]\\ \sf\longmapsto c=\dfrac{Q}{m\Delta T}[/tex]

[tex]\\ \sf\longmapsto c=\dfrac{4390}{1.95(17.8)}[/tex]

[tex]\\ \sf\longmapsto c=\dfrac{4390}{18.69}[/tex]

[tex]\\ \sf\longmapsto c=234.8J/kg°C[/tex]

Explanation:

Human activities have a tremendous impact on the carbon cycle. Burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere. ... This extra carbon dioxide is lowering the ocean's pH, through a process called ocean acidification.

Answer:

Answer: 3.45 moles Li contains 2.08 × 10 (to the power of)24 atoms . Explanation: The relationship between atoms and moles is:. 1 mole atom. =6.022

Answer:

[tex]\boxed {\sf 5.63 \times 10^{24} \ atoms \ Li}}[/tex]

Explanation:

We are asked to find how many atoms are in 9.35 moles of lithium (Li)

Moles are converted to atoms using Avogadro's Number or 6.022×10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, the particles are atoms of lithium.

We convert using dimensional analysis, so we set up a conversion factor using Avogadro's Number.

[tex]\frac {6.022 \times 10^{23} \ atoms \ Li}{1 \ mol \ Li}[/tex]

We are converting 9.35 moles of lithium to atoms, so we multiply the conversion factor by this value.

[tex]9.35 \ mol \ Li *\frac {6.022 \times 10^{23} \ atoms \ Li}{1 \ mol \ Li}[/tex]

The units of moles of lithium cancel.

[tex]9.35 *\frac {6.022 \times 10^{23} \ atoms \ Li}{1 }[/tex]

[tex]9.35 *{6.022 \times 10^{23} \ atoms \ Li}[/tex]

[tex]5.63057\times10^{24} \ atoms \ Li[/tex]

The original value of moles (9.35) has 3 significant figures, so our answer must have the same. For the number we found that is the hundredth place. The 0 in the thousandth place tells us to leave the 3 in the hundredth place.

[tex]5.63 \times 10^[24} \ atoms \ Li[/tex]

9.35 moles of lithium contains approximately 5.63×10²⁴ atoms of lithium.

Answer:No, it is He

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Answer:

The arrow and blue colored blocks indicate the transition metal elements

Explanation:

B.

"The arrow and blue colored blocks in periodic table indicate transition elements. "

What is transition elements?

The type of elements in which the last electrons enter into d-orbital can be referred to as transition elements. They can be placed in the middle of the periodic table. they are indicated with blue color in the periodic table so that it is easy to identify transition element in periodic table. Transition elements can show colored property because it shows d-d transition.

The electronic configuration of transition elements can be shown as:

(n-1)[tex]d^{1-10}[/tex]n[tex]s^{1-2}[/tex].

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Answer:

the picture is kinda blurry

Explanation:

Answer:

C.) 0.85m

Explanation:

If you moved it for 3 seconds and it went 0.65m then continued to move for another 0.20m you would just add the two numbers together.

0.65+0.20=0.85m

Answer: A and C

Explanation: For example, the compound HCl (hydrogen chloride) is comprised for 2 different types of atoms: one hydrogen and one Chlorine. In order to fuse these two elements together to form a compound, they must bond in one of three ways- ionic, covalent or metallic

The two statements that are true are as follows:

Thus, the correct options for this question are A and C.

A chemical compound may be defined as a type of chemical substance that is mainly composed of many similar molecules that contain atoms of more than one chemical element. These atoms are typically held together by chemical bonds.

If you take the example of NaOH where you will find three elements such as sodium, oxygen, and hydrogen. Each of these chemical elements is held together by chemical bonds in order to form sodium hydroxide.

The atoms of sodium hydroxide would not change their chemical formula when it is present as a chemical compound.

Therefore, the correct options for this question are A and C.

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Answer:

Maybe to hold the whole parts of the cell

Answer: C=1

Explanation: If you round 1.04 to a single digit its 1

Answer:

MgCl2 +2K= 2KCl+ Mg

Explanation:

I think MgCl2 you meant

Answer:

A

Explanation:

Option A is correct. Saturated hydrocarbons are stable compounds, which means that they only have single bonds between carbon atoms.

Answer:

Explanation:

The law of conservation of mass states that mass is neither created nor destroyed during a chemical reaction. This can be gleaned from the third postulate in Dalton's series. Magnesium oxide decomposes into magnesium and oxygen. If 4.03 g of magnesium oxide decomposes to form 2.43 g of magnesium, what mass of oxygen gas is also released in the reaction

The word say magnesium oxide decomposes to magnesium and oxygen

the chemical symbols say

MgO-----------> Mg + O2  (since natural oxygen is diatomic)

the balanced  equation says

2MgO-------------->2Mg + O2

4.03 gm----------> 2.43 + ?0 gms

tour high school Algebra I class says

? = 4.03 -2.43 =1.60

your chemical analytcal lab says %mO in MgO = 16/40.3 = 39.7%

your calculator says

39.7/100 X 4.03 = 1.60

all of these prove the law of conservation of mass

Answer:

Explanation:

In the tiny capillaries of the body tissues, oxygen is freed from the hemoglobin and moves into the cells. Carbon dioxide, made by the cells as they do their work, moves out of the cells into the capillaries, where most of it dissolves in the plasma of the blood.

Blood rich in carbon dioxide then returns to the heart via the veins. From the heart, this blood is pumped to the lungs, where carbon dioxide passes into the alveoli to be exhaled.

As we know that

P.E. = mgh

where,

P.E. = Potential energy of the object =?

m= mass of object= 3kg

g= acceleration due to gravity = 9.8 ms^-2

h = height between object and animal = 0 m

Then

P.E. = 3× 9.8 × 0 = 0 Joules or 0J

Have a luvely day!

Answer:

1. D: melting point, boiling point, surface tension, and vapor pressure

2. I’m not too sure about the second one. Maybe D Mix ice with water until just before equilibrium is reached but some ice remains that is still melting. However I am unsure. So do not take my word for it

Explanation:

The properties that a student can design an investigation of the electrostatic forces between molecules in a substance are  melting point, boiling point, surface tension, and vapor pressure.

To determine the melting point of ice, which procedure would best help measure the melting point temperature is to Mix ice with water until equilibrium is reached but some ice remains that is still melting.

Intermolecular forces are regarded as the forces of attraction or repulsion that exist or act between close particles  of atoms, molecules, or ions.

The slow heating rate at the melting point is important in order to get an the measurement.

When an individual heat ice, its temperature often rises, but as soon as the ice starts to melt, the temperature stays constant until all the ice has melted.

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