Why did Mendeleev organize the elements? A he noticed regular patterns in the properties of elements B C D elements were discovered to have new physical properties elements were discovered to have new chemical properties new elements were being discovered that needed to be organized

Q: 10. Nitrogen, hydrogen, and ammonia (NH3) are all composed of molecules. What is it about a molecule…

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Q: TRUE OR FALSE 1. A heterogeneous mixture can be separated into pure substances, but a homogeneous…

A: Mixture  A mixture is the physical combination of two or more substances in which the identities are…

Q: There are four sketches below. The first sketch shows a sample of Substance X. The three sketches…

A: A question based on physical and chemical changes. A molecular system is given whose most possible…

Q: If molecules of hydrogen, nitrogen, oxygen and chlorine are moving at the same speed, which molecule…

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Q: A green solution of a pH indicator was added to a sample of spring water. The resulting solution was…

A: A chemical change is an irreversible change that takes place due to a chemical reaction. A chemical…

Q: Which of the following steps in an overall process involve( s) a physical change and which…

A: Physical change: These are the reversible changes that clarify the physical property of sample.…

Q: 2NH3(8)+302(8)+2CH4(g) 2HCN(g)+6H2O(g) kJ

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Q: a) upon heating, a blue powder turned white and lost mass b) A white soil forms three different…

A: Given: For each of the changes have to decide whether two or more elements formed a compound or if a…

Q: 19 Which of the following most accurately models the relationship between compounds and elements? A…

A: Given: 19. Models to determine the relationship between elements and compounds.

Q: CHE 180 General Chemistry I Homework Chapter 1, continued 10. Exercise 92: The properties of a…

A: Based on change in properties of a mixture of substances we can define it as a physical or chemical…

Q: 2. In a Mars Direct mission, the astronauts would return home in an Earth Return Vehicle (ERV)…

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Q: There are four sketches below. The first sketch shows a sample of Substance X. The three sketches…

A: Answer:- This question is answered by using the simple concept of physical change and the chemical…

Q: Supposed to magnesium feelings and sulfur or heat it so they react with each other forming magnesium…

A: Concept: The pure substances have constant composition throughout the given substance. The mixed…

Q: In the figure shown, is a chemical reaction occurring? Yes, because the atoms have rearranged to…

A: A reaction in which reacting atoms chemically combine with each other to form a new substance is…

Q: He arranged elements into increasing atomic numbers and found that there is a periodic repetition of…

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Q: States of matter are distinct forms that different phases of matter take on. How many physical state…

A: Solution - States of matter are distinct forms that different phases of matter take on. 3 physical…

Q: The human body contains many elements from the periodic table. It is mostly composed of oxygen and…

A: Mass Of hydrogen = 7.07.0 kg Mass of phosphorus = 0.780.78

Q: Although some elements are found in an isolated state, most elements are found combined as with…

A: The objective of the question is to find the correct option which describes the statement and fills…

Q: What is Heterogeneous substance? Give an example?

A: A mixture is a material made up of two or more different substances which are not chemically…

Q: Gas chromatography is an analytical technique that is used to separate and analyze samples that can…

A: Gas chromatography is one of the analytical technique that is used for the separation of compounds.…

Q: There are four sketches below. The first sketch shows a sample of Substance X. The three sketches…

A: Given changes it undergoes Type of Change = Need to determine

Q: Melt Freeze Freeze Melt Condense Solidify Vhat happens when ice is heated? What happens when paint…

A: Melting is a process of converting the solid phase to the liquid phase, it occurs when the…

Q: What observations did Antoine Lavoisier make? What law did he formulate?

A: Antoine Lavoisier make an observation that in a chemical reaction matter is neither created    nor…

Q: In the table below you will find three descriptions of scientists engaging in activities that are…

A: In this question we need to find missing word.

Q: Substance Reaction to flame Phase at room temperature Reaction with water Hydrogen Colorless Gas…

A: Strontium chloride

Q: 53. Two stable allotropes of oxygen are dioxygen (O2) and ozone (03). Dioxygen is weakly attracted…

A: Allotropes are different types of the same component that have different characteristics. Oxygen is…

Q: art II. Complete each statement below by filling in the blanks with the correct words found from the…

A: Solutions- Kinetic theory of gases.

Q: The observation of light during a reaction is usually associated with which of the following? A a…

A: Chemical change: In chemical change the identity of the compound changes and  new compounds are…

Q: 6. A 15.00 g sample of an oxide of nitrogen is heated and decomposes to nitrogen and oxygen. All the…

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Q: During a filtration or distillation experiment, we separate a mixture into its individual…

A: A mixture is a combination of two or more pure substances that retain their chemical identities.  It…