CHEMISTRY HIGH SCHOOL

What is the name of a neutral group of atoms that are held together by covalent bond (this word has 8 letters)

Answers

Answer 1
Answer: The word that you're looking for is either nonpolar or molecule. Both have 8 letters. A molecule is a group of atoms held together by covalent bonds, and nonpolar is used to describe a molecule in which the electrons are shared equally between the atoms. 

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A brick has a volume of 475 cubic centimeters and a mass of 912 grams. Calculate itsdensity.
Write your answer to the hundredths place

Answers

Answer:

1.92 g/cm³

Explanation:

The density of a substance can be found by using the formula

density = (mass)/(volume) \n

From the question we have

density = (912)/(475) \n

We have the final answer as

1.92 g/cm³

Hope this helps you

What is the Hf for this reaction? 16CO2(g) + 18H2O(g) 2C8H18(l) + 25O2(g)

Answers

To solve this we must be knowing each and every concept related to Enthalpy. Therefore, 10,148KJ/mol is the ΔH for formation for the reaction 16CO_2(g) + 18H_2O(g) \rightarrow 2C_8H_(18)(l) + 25O_2(g)

What is Enthalpy?

Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances. Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance.

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

16CO_2(g) + 18H_2O(g) \rightarrow 2C_8H_(18)(l) + 25O_2(g)

ΔH for formation= 10,148KJ/mol

Therefore, 10,148KJ/mol is the ΔH for formation for the reaction 16CO_2(g) + 18H_2O(g) \rightarrow 2C_8H_(18)(l) + 25O_2(g)

To know more about enthalpy, here:

brainly.com/question/24170335

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Answer:

10,148

Explanation:

Commercial fertilizers, which are made by humans, are used to enrich soil for healthier crops. However, erosion may carry the fertilizer chemicals to the oceans. The presence of these chemicals may cause certain kinds of algae to reproduce rapidly. This decreases the amount of oxygen in the water, which can cause organisms that depend on it, like fish, to die.Which statements describe the impact of the use of fertilizers? Select two options.

It improves the growth of crops.
It provides more food for fish.
It causes erosion and washes away soil.
It causes the death of crops.
It harms organisms that live in the oceans.

Answers

The statements that describe the impact of the use of fertilizers are as follows:

  • It harms organisms that live in the oceans
  • improves the growth of crops

What is the effect of eutrophication?

Eutrophication is the process that involves the addition of artificial or natural nutrients, mainly phosphates, through detergents, fertilizers, or sewage, to an aquatic system.

According to this question, commercial fertilizers, which are made by humans, are used to enrich soil for healthier crops. However, erosion may carry the fertilizer chemicals to the oceans which leads to eutrophication.

This eutrophication may cause certain kinds of algae to reproduce rapidly, hence, having the following impacts:

  • It harms organisms that live in the oceans due to reduced oxygen content.
  • improves the growth of crops due to excessive nutrients

Learn more about eutrophication at: brainly.com/question/13232104

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Answer: 1 and 5

Explanation:

Just took it

Potato strips placed in a container of concentrated salt water will ultimately __.

Answers

Shrivel/shrink and become flaccid because the water inside of the potato leaves the potato and joins the salt water due to the lower concentration in the salt water

Carbon forms molecular compounds with some elements from Group 16. Two of these compounds are carbon dioxide, CO2, and carbon disulfide, CS2.Carbon dioxide is a colorless, odorless gas at room temperature. At standard temperature and pressure, CO2(s) changes directly to CO2(g).

Carbon disulfide is formed by a direct reaction of carbon and sulfur. At room temperature, CS2 is a colorless liquid with an offensive odor. Carbon disulfide vapors are flammable.

59 Identify one physical property and one chemical property of CS2. [1]

Answers

Answer: Physical property of CS_2 is state of matter (liquid) and it is a chemical compound.

Explanation:

Chemical property is defined as the property of a substance which is observed during a reaction where the chemical composition identity of the substance gets changed.

Physical property is defined as the property which can be measured and whose value describes the state of physical system. For Example: State, density etc.

Carbon disulfide(CS_2) is the compound which is formed by the chemical combination of carbon and sulfur atoms. The equation for this follows:

C+2S\rightarrow CS_2

The chemical property of carbon disulfide is different from that of carbon and sulfur. Thus, this is a chemical compound.

It is given, that this compound is a colorless liquid, which means that the state of this compound is liquid state.

Hence, physical property of CS_2 is state of matter (liquid) and it is a chemical compound.

The physical property of carbon disulfide is that at room temperature, CS2 is a colorless liquid with an offensive odor. The chemical property of carbon disulfide is that it is formed by a direct reaction of carbon and sulfur.

A solution is made by dissolving 10.20 grams of glucose (C6H12O6) in 355 grams of water. What is the freezing-point depression of the solvent if the freezing point constant is -1.86 °C/m? Show all of the work needed to solve this problem.

Answers

The freezing point constant means that the temperature depression when adding one mole of the solute. The mole number of the solute is 10.20/180=0.0567 mol. So the answer is 1.86*0.0567=0.105 ℃.

10.20 g C6H12O6 x (1 mole C6H12O6 / 180 g C6H12O6) = 0.0567 mole C6H12O6

Then convert grams of water to kilograms of water by dividing by 1000.  

355 g / 1000 = .355 Kg of H2O

molality (m) = (0.0567 mole C6H12O6 / .355 Kg of H2O) = 0.160 m  

Then plug it in to the formula Δtf = Kfm

Δtf = (-1.86 °C/m) x (0.160 m)  

Δtf = -0.298 °C
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