CHEMISTRY HIGH SCHOOL

If an industrial worker knows that his chemical process is 87.3% efficient and he needs tocollect 100.0g of the product when all is said and done, what should his theoretical yield
be (in grams)?

Answers

Answer 1
Answer:

I legitimately think it's 87.3 grams

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How many protons are there in the following atom? 235 92 U
235
143
317
92

Answers

Answer: The number of protons in given isotope are 92.

Explanation:

The general representation of an isotope is given as _Z^A\textrm{X}

where,

Z = atomic number

A = atomic mass

X = symbol of an element

We are given:

Isotope = _(92)^(235)\textrm{U}

Atomic number is defined as the number of protons or number of electrons present in an element. Here atomic number is 92.

Thus, Number of protons in given isotope of uranium = 92

Answer:

The number of protons is 92.

Explanation:

Hello! Let's solve this!

This is the way to write an isotope

(A)/(Z)X

Z: represents the atomic number

A: represents the mass number

X: is the element

The number of protons is equal to the atomic number.

In this case A=235

Z=92

X=U

We conclude that in this case the atomic number is 92, so the number of protons is 92.

Scientific experiments are specially designed to evaluate explanations for an observed phenomenon. A student decides to conduct an experiment to determine the effect that the amount of time spent in sunlight has on the overall growth of a plant. The student will carry out the experiment using two identical plants that will only spend different amounts of time in sunlight. All other aspects necessary for growth will remain identical for each. In the experiment described, what would be the amount of water given to each plant?

Answers

Answer:

This question lacks options, the options are:

a. an observation

b. a dependent variable

c. an independent variable

d. a control

The answer is D. Control

Explanation:

According to the question, a student decides to conduct an experiment to determine the effect that the amount of time spent in sunlight has on the overall growth of a plant. The student keeps all other variables needed for the plants' growth in this experiment the same/identical. These variables kept identical by the student is called CONTROL OR CONSTANT.

One of the CONTROL is the amount of water given to each plant. The amount of water given to the two plants being tested must be the same. Hence, WATER in this experiment is a CONTROL VARIABLE.

Note that, the independent/manipulable variable is the amount of time spent in sunlight while the dependent/measurable variable is the growth of the plants.

Answer:

The answer is D control

Explanation:

The process of boiling a mixture so that one part will evaporate, then cooling or condensing the evaporated liquid, and finally collecting the cooled liquid, is known asa. settling.
b. filtration.
c. distillation.
d. evaporation.

Answers

The answer is C. Distillation. Distillation is a common process for separating liquid mixtures by using the principle of volatility and boiling point. For a liquid mixture with two liquid components A and B, A will have a lower boiling point or higher volatility than B. By boiling the mixture at the boiling point of component A, only component A will evaporate from the mixture. The evaporated gas will then be cooled to condense component A back to a liquid.

The answer would be C. :))

Which occurs when two fluorine atoms react to produce a fluorine molecule?(1) Energy is absorbed as a bond is broken.
(2) Energy is absorbed as a bond is formed.
(3) Energy is released as a bond is broken.
(4) Energy is released as a bond is formed.

Answers

The answer is 4. When atoms mix to create a compound, energy is continuously set off, and the compound has a lesser total energy. When a chemical reaction happens, molecular bonds are shattered and other bonds are made to create unalike molecules. For instance, the bonds of two water molecules are shattered to make hydrogen and oxygen.

The change that occurs when two fluorine atoms react to produce fluorine molecule is \boxed{\left( 4 \right){\text{ Energy is released as a bond is formed}}}.

Further Explanation:

The attraction between different atoms, molecules and ions is known as a chemical bond. Such bonds are responsible for the formation of chemical compounds.

An ionic bond is formed as a result of the interaction between a metal and a non-metal. Metals have the tendency to lose electrons while non-metals tend to gain electrons. Due to this, metal atoms form cations by loss of electrons and non-metals become anions with the gain of electrons.

A covalent bond is formed by the mutual sharing of electrons between the bonded atoms. It is also called molecular bond. Such bonds usually exist between two or more non-metals.

The atomic number of fluorine is 9 and it has a configuration of 1{s^2}2{s^2}2{p^5}. It is just one electron short of the stable configuration of neon. When two fluorine atoms approach each other, both share one of their valence electrons and form a single covalent bond. Since {{\text{F}}_{\text{2}}} formed has a complete octet, its stability is quite high. The two fluorine atoms tend to bond with each other to form fluorine molecule so energy is released during the process. Therefore option (4) is correct.

Learn more:

  1. Identification of ionic bonding: brainly.com/question/1603987
  2. What type of bond exists between phosphorus and chlorine? brainly.com/question/81715

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Ionic and covalent compounds

Keywords: chemical bond, ionic bond, covalent bond, fluorine, 9, neon, stability, octet, configuration, electron, fluorine atoms, fluorine molecule. Energy.

C3H8 + 5O2 -> 3CO2 + 4H2OAccording to this equation, which ratio of oxygen to propane is correct?

1- 5 grams O2 / 1 gram C3H8
2- 5 moles O2 / 1 mole C3H8
3- 10 grams O2 / 11 grams C3H8
4- 10 moles O2 / 11 moles C3H8

Answers

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 5 moles oxygen / 1 mole propane. The correct option is option C among all the given options.

What is mole?

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

The balanced equation for the given chemical reaction can be given as

C_3H_8 + 5O_2\rightarrow 3CO_2 + 4H_2O

Stoichiometry represents the number of number of moles of reactant and products. The mole ratio between oxygen and propane is 5:1. the correct option isoption 2.

Therefore, 5 moles oxygen / 1 mole propane. The correct option is option C among all the given options.

To know more about mole, here:

brainly.com/question/15209553

#SPJ3
The answer is number 2

4.75 mL is the same as 0.00475 L.
True or False

Answers

True.  1mL equals 1x10⁻³L so to convert mL into L you have to move the decimal point over 3 places to the left.  

I hope this helps.  Let me know in the comments if anything is unclear.
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