2. Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which of the following is the BEST evidence that a chemical reaction occurs when the coal burns? a. Production of mechanical energy c. A new substance is produced b. Production of electricity d. Formation of precipitate

Q: Balance the following equations:

A: balancing of reaction is done to follow the conservation of mass.

Q: Nor 99 Nor 99 Nor Bra Bra Homepa Homep G Am ь Му W KM O 200 В Нус O AP 15. G The G AO Q AP + A…

A:

Q: 18. A silver wire has a diameter of 0.500 mm. What length of this wire contains exactly 1.00 mol of…

A: given, the diameter of silver wire = 0.500mm = 0.05 cm number of mole of silver = 1mol density of Ag…

Q: Modern pennies are composed of zinc coated with copper. A student determines the mass of a penny to…

A: The balanced reaction taking place is  Zn (s) + 2 HCl (aq) --------> H2 (g) + ZnCl2 (aq)  Given :…

Q: following reactions as homogeneous or heterogene

A: Homogenous reactions include the reactants and products in the same phase. Heterogeneous reactions…

Q: 1. In a change, one kind of matter is turned into another. 2. A chemical reaction is accompanied by…

A: "Since there are multiple sub-parts in this question so I am solving only the first three sub-parts.…

Q: State the law of conservation of mass and energy as it applies to a chemical reaction.

A: The law of conservation of mass and energy it applies to a chemical reaction has to be stated below.

Q: When HCl is added to water it dissolves and dissociates to form H+ and Cl-   HCl (aq)--> H+ (aq)…

A: Since the bonded electrons between the H and Cl is formed by sharing of 1 electron from each H atom…

Q: Which option provides the best evidence of a chemical change? O A. A solid is not visible after it…

A: The change which is brought about by the difference in the physical appearance of the species in…

Q: neutralization, the products are   A. sodium chloride   B. salt and water   C. a nonmetal…

A: Neutralization reaction It is a reaction between an acid and a base

Q: How do you know (evidence) that a chemical reactions has occurred. Give specific evidence at least.

A: Chemical reaction is process by which new products are formed as a result of the reaction between…

Q: When a candle is lit and allowed to burn for 15 minutes, some wax drips and collects at the base of…

A: (a) When a candle burns the physical change can be easily seen because the solid wax is converted…

Q: Match the letter/s that correspond to the descriptions in the given numbers: A.chemical equation AB.…

A: In a chemical reaction, reactants give products and in a balanced chemical equation, the number of…

Q: 15) Sugar, C„H„O,, is burned in air. 16) Ammonia is formed from its elements.

A: As already mentioned that , I have to do only qestion-15 and question -16 so I am doing that…

Q: Oil spreads on the water to form a film 110nm thick. How many square kilometers(Km²) of the ocean…

A: The oil and water are two immiscible liquids which means that the oil cannot be dissolved in water.…

Q: The table below sbows elements present in the Sun. The Sun's composition is similar to other main…

A: The sun is made up of hydrogen and helium in the maximum amount. All the elements produced in the…

Q: KCl(aq) + AgNO3(aq)→         (s) FeCl3(aq) + Pb(NO3)2(aq)→         (s) ZnCl2(aq) + KOH(aq)→…

A: The given incomplete chemical equation are completed with precipitate of each reaction is predicted.

Q: This law states that the electrical charge of 1 mol of electron is equal to 96,500 coul of…

A:

Q: Adding hydrochloric acid to sodium hydrogen carbonate will form sodium chloride, or table salt. If…

A: HCl + NaHCO3 → NaCl + H2CO3 If 1 mole of HCl is added, 1 mole of NaCl is formed. If 0.5 mole of HCl…

Q: What information is important to those who will be analyzing the samples?

A: Various types of analysis of compounds are performed in chemistry. These analysis helps in finding…

Q: (d) fifteen atoms of iron react with twelve molecules of water to produce iron oxide (Fe,O¸) and…

A:

Q: 4. Zn(s) + Ni2(aq) Zn*(aq) + Nics) 5. Pb(s) + Sn*2(aq) Pb*2(aq) + Sn(s) 6. Al(s) / Al*3(aq) //…

A: Since you have posted multiple questions, we will solve first one for you. To get remaining parts…

Q: Digesting food is an example of what? A chemical change A physical change

A: Physical change :-  In this chemical composition of the substance does not change. Involve change in…

Q: A titanium ore contains rutile (TiO2) plus some oxides of iron and silica. When it is heated with…

A: Reaction: TiO2 + C + Cl2 ---> TiCl4 + Cl2 molecular mass of TiO2 = 79.866 g/mol molecular mass of…

Q: substance. 3. А (An) 4. According to the law of be neither created nor destroyed during means…

A: (4) According to the law of __________, Matter can neither be created nor destroyed during a…

Q: 19. When limestone is subjected to high heat, it becomes calcium oxide and releases carbon dioxide…

A: The heating of limestone is a chemical change;The limestone decomposes into two other substances,…

Q: Figure 2 H₂O2 (1) - ---> H₂O₂ (g) H₂O₂(aq) -- ---> H₂O (1) + O2 (g) Which of the following…

A:

Q: What is chemical reactions and it's type

A: The reaction between the reactants leads to the formation of the products. The new products are…

Q: 4. From a complete and correctly written chemical equation, you can obtain the rioirW.0r a. chemical…

A: answer : d ) all of the above    from a complete and correctly written chemical equation , you can…

Q: 12. Which picture shows an example of a chemical change taking place? LORV A B C

A: To determine which of the below picture shows chemical change.

Q: Give 3 examples for each type of chemical reactions A. Combination (Synthesis) B. Decomposition

A: There are four types of chemical reactions. These are,  a) Combination  b) Single Displacement  c)…

Q: Students can develop alternative conceptions (commonly called misconceptions) in relation to some…

A: We begin with a balanced chemical equation of the given chemical equation: 8Fe+S8→8FeS

Q: A 5.738g sample of impure aluminium reacted with hydrochloric acid converting all the aluminium in…

A:

Q: A Kool-aid solution has sugar and flavoring as the solute and water as the solvent. If ice cubes of…

A: Solvent is water solute is sugar Effect of melting of ice on sugar molecules = ?

Q: f you put salt water in an open container under the sun, the water evaporates leaving the salt…

A: ANSWERE IS DISCUSSED BELOW :

Q: (a) Iz(s) + 5 Cu²* (aq) + 6 H;O(I) –→ 2 103"(aq) + 5 Cu(s) + 12 H*(aq) (b) Hg²*(aq) + 21 (aq) →…

A: I2(s) + 5Cu+2 (aq) + 6H2O → 2IO3-(aq) + 5 Cu (s) + 12 H+         E cell of the reaction = Ecathode…

Q: Which substance showed no chemical change? a. hydrogen b. sodium c. carbon d. argon…

A: IDEAL GAS An ideal gas is one in which all atom-to-atom or molecule-to-molecule collisions are…

Q: Use the figures to answer the following question. Figure 1 Figure 2 H2O2 (1) --> H202 (g) H2O2{aq)…

A: Physical change: In a physical change only the state of matter changes. In this change different…

Q: 16. Is the change in the illustration below a physical change or a chemical change? Explain your…

A: Physical change is the one which causes the change in physical state of the substance but its…

Q: mass of sugar and dirt 20.200 +/- 0.001g mass of glass and paper 21.206 +/- 0.001g mass of glass…

A: Original Mixture: Sugar and Dirt Mass of original mixture = 20.2 +/- 0.001 g Mass of glass and paper…

Q: Why is chemical theory successful? What are some of the limitations of the theory?

A: The chemical theory describes the physical phenomena which give rise to chemistry as well as the…

Q: Why are the changes of state (e.g., boiling) not a chemical reaction A. Changes of state create new…

A: b

Q: Identify each of the following reactions as a precipitation, neutralization, or redox reaction:

A: (a) Redox reaction. Oxidation number of Mg is changed from 0 to +2. (b) Neutralization reaction.…

Q: What is chemical combination and chemical reaction? What are the significant concepts about them?

A: Chemical combination is a reaction in which two or more elements or compounds combine to form a new…

Q: f) An reaction is one that gives off heat. g) The amount of energy required to raise the temperature…

A: " Since you have posted a question with multiple sub-parts , we will solve first three sub-parts for…

Q: 4. For each of the following chemical ........a. CH4(g) + O2(g) → CO2(g) + H2O(g)b. Al(s) + HCl(aq)…

A: (a)In a balanced equation number of atoms for every element and total change in the reaction are…

States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.