A chemist set up a synthesis of phosphorus trichloride by reacting 12.0 grams of phosphorus with 35.0 grams of Cl2. 42.4 grams of phosphorus trichloride was produced. Calculate the percent yield of this compound.

Answer:

200g or 40 teaspoons

Explanation:

An average human, weighing about 50 pounds, has about 200 g or 40 tps of NACl

Answer:

Atomic mass of nitrogen = 14.0067 amu.

Explanation:

Isotopes can be defined as two or more forms of a chemical element that are made up of equal numbers of protons and electrons but different numbers of neutrons.

Generally, the isotopes of a chemical element have the same chemical properties because of their atomic number but different physical properties due to their atomic weight (mass number).

The two isotopes of nitrogen are nitrogen-14 and nitrogen-15.

Given the following data;

Relative abundance of N-14 = 99.63%

Atomic mass of N-14 = 14.003

Relative abundance of N-15 = 0.37%

Atomic mass of N-15 = 15.000

The atomic mass is;

14.003 × (99.63/100) + 15.000 × (0.37/100)

Atomic mass = 14.003 × (0.9963) + 15.000 × (0.0037)

Atomic mass = 13.9512 + 0.0555

Atomic mass = 14.0067 amu.

Therefore, the atomic mass of nitrogen is 14.0067 amu.

Considering the definition of atomic mass, isotopes and atomic mass of an element, the average mass of nitrogen is 14.0067 amu.

First of all, the mass number A of an atom is the sum of the number of protons and the number of neutrons in the atomic nucleus.

Being the number of protons the atomic number, the same chemical element can be made up of different atoms, that is, their atomic numbers are the same, but the number of neutrons is different. These atoms are called isotopes of the element.

On the other hand, the atomic mass of an element is the weighted average mass of its natural isotopes.

In other words, the atomic masses of chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.

In this case, you know that the two common isotopes of  nitrogen have masses of 14.003 amu (99.63% abundance) and 15.000 amu  (0.37%). Then, the average mass of lithium can be calculated as:

14.003 amu×0.9963 + 15.000 amu×0.0037= 14.0067 amu

Finally, the average mass of nitrogen is 14.0067 amu.

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Mixtures are a group of elements that are mixed together but not chemically combined

Elements are the fundamental materials of which all matter is composed.

Element: A substance that is made up of only one type of atom. Compound: A substance that is made up of more than one type of atom bonded together. Mixture: A combination of two or more elements or compounds which have not reacted to bond together

Answer:

d. Bar graph

Explanation:

a. Line graph  - this type of graph is best for continuous data, such as how a the sales of a particular cereal drop over time

b. Pie chart  - this is best for % data, such as looking at the % of different nutrients (carbohydrates, fats, proteins) in a cereal

C. Stem-and-leaf plot  - presents quantitative data such as the ages of people who buy a brand of cereal

d. Bar graph - this is best for plotting different numbers in distinct categories to compare them to one another  

Answer:

Radiant energy

Explanation:

Answer: electromagnetic waves

Explanation: energy is transmitted through space in the form of electromagnetic waves Unlike sound electromagnetic waves can travel through empty space These waves include visible light x-rays and microwaves!

Answer:

The specific heat capacity of chromium is 0.449 j/g.°C thus given metal is chromium.

Explanation:

Given data:

Mass of metal = 24 g

Initial temperature = 20 °C

Final temperature = 45°C

Energy absorbed by metal = 269.4 j

Which metal is this  = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 45°C - 20 °C

ΔT = 25°C

269.4 j = 24 g × c × 25°C

269.4 j = 600 g.°C× c

c = 269.4 j/600 g.°C

c =0.449 j/g.°C

The specific heat capacity of chromium is 0.449 j/g.°C thus given metal is chromium.

a compound includes more than two elements but is a pure substance

Explanation:

hope this helped

Answer : The correct option is, (d) The arrow locations represent neither accuracy  nor precision.

Explanation :

Precision : It is defined as the closeness of two or more measurements to each other.

For Example: If we measure a length 4 times and we get 5.8 m each time. Then the measurement is very precise.

Accuracy : It is defined as the closeness of a measured value to a standard or known value.

For Example: If the weight of the substance is 40 kg and one person measures 39.9 kg and another person measures 39.8 kg. Then, the weight measured by first person is more accurate.

Hence, we from this we conclude that the arrow locations represent neither accuracy  nor precision.

Answer : The correct option is, (d) The arrow locations represent neither accuracy  nor precision.

Explanation :

Precision : It is defined as the closeness of two or more measurements to each other.

For Example: If we measure a length 4 times and we get 5.8 m each time. Then the measurement is very precise.

Accuracy : It is defined as the closeness of a measured value to a standard or known value.

For Example: If the weight of the substance is 40 kg and one person measures 39.9 kg and another person measures 39.8 kg. Then, the weight measured by first person is more accurate.

Hence, we from this we conclude that the arrow locations represent neither accuracy  nor precision.

Explanation:

2. Chemical

3. Physical

5. Chemical

I think that's it

Hope it helps :)

Physical properties describe matter.Physical  properties of a substance can be easily observed.One can use their five senses to determine physical properties.Chemical properties usually describe how a substance reacts. Physical properties can be used to identify substances.

Any property which describes the state of a physical system is called as a physical property.Changes in physical properties are used to describe changes between the states. They are often related to as observable properties.

Physical property which can be quantified is a physical quantity. These are also classified further with respect to their directionality. Isotropic properties do not change with direction of observation while anisotropic properties change with direction of observation.

Physical properties are differentiated from chemical properties by the way they determine how a substance behaves in a chemical reaction.

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Answer:

Modern continents hold clues to their distant past. 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.

Answer:

Their valence electrons/properties

Explanation:

Elements in the same group of the periodic table have the same amount of valence electrons, which determines how they bond with other elements in other groups. This also determines their properties such as their reactivity. Since Li, Na, and K are in the same group, they must have similar properties and the same amount of electrons in their outermost shell.

Answer:

a

Explanation:

Answer:

2 A

Explanation:

Answer:

The amount of energy transferred to the diamond while being cut is thus  Q = 852000 J

Explanation:

Since quantity of heat transferred Q = mcΔθ where m = mass of substance , c = specific heat capacity of substance and Δθ = temperature change.

Now, given that for diamond, m = mass of diamond = 600 g, c = specific heat capacity of diamond = 710 J/g°C and Δθ = temperature change = 2 °C.

So, the amount of energy transferred to the diamond while being cut is thus

Q = mcΔθ

Q = 600 g × 710 J/g°C × 2 °C

Q = 852000 J

So, the amount of energy transferred to the diamond while being cut is thus  Q = 852000 J

Answer:

g/cm3

Explanation:

(grams, centimeters)

Answer:

The answer is

Explanation:

The pressure exerted by an object given the force of the object and the area can be found by using the formula

[tex]P = \frac{f}{a} \\ [/tex]

where

P is the pressure

f is the force

a is the area

From the question

f = 2400 N

a = 0.4 m²

So we have

[tex]P = \frac{2400}{0.4} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

Chromatography?

Explanation:

When a pure sample is run next to a tested substance to check if it is a component in the mixture it is called a ;  Reference value

A reference value in a test is the average of repeated value gotten from laboratory measurements carried out in the lab using an accurate measurement tool. It is the bench mark value for which the value of any tested substance will be compared to.

Therefore to verify if a tested substance is a component in the mixture we have to run it next to a pure sample ( reference value ).

Hence we can conclude that When a pure sample is run next to a tested substance to check if it is a component in the mixture it is called a ;  Reference value

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Answer:

D

Explanation:

Answer:

Since AlCl3 sublimes and NaCl does not sublime sublimation process will separate the two. Heat the mixture, aluminium chloride sublimes into vapour and forms the sublimate on the cooler parts of heating tube sodium chloride will remain at the bottom of the heating tube.

Explanation:

I hope it helps you ..

Sam can stir the water after adding the drink mix to help increase or speed up the dissolving process in this scenario.

This is the process in which a solute dissolves in a solvent to form a solution under certain conditions.

Stirring will increase the surface area thereby leading to an increase in the dissolving process which makes it the most appropriate choice.

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Answer:

sodium,silicon

Explanation:

sodium=11

siicon=14

Answer:

Protons and neutrons are in the nucleus (the center of an atom), but electrons are not.

Answer:

ok

Explanation:

Which of the following is NOT a possible clue that a chemical change has

taken place? *

A change of color

O A change of state

Production of gas

Formation of a precipitate

Answer:

Fe2+ is greater in size as it has lost less electrons than Fe3+ . So, the nuclear pull is more strong on Fe3+ decreasing the atomic size. Thus Fe2+ is greater in size.

Explanation: