Which of the following describe chemical properties?Sugar burns in air to form water and carbon dioxide
Water freezes
Titanium is less dense than iron
Iodine ( a purple solid) becomes a purple gas

Answers

Answer 1

Answer: sugar burns in air.....................................

Related Questions

According to VSEPR theory, what causes water molecules to have a bent shape? A. the unusual location of the free electrons. . B. repulsive forces between specific lone pairs of electrons. . C. attraction between the fixed orbitals of the unshared pairs of oxygen electrons. . D. ionic attraction and repulsion
A solution of H 2 SO 4 ( aq ) with a molal concentration of 1.94 m has a density of 1.119 g / mL . What is the molar concentration of this solution?
Elements can combine to form molecules, like o2 or co2. elements combine to form molecules and these elements are joined together by a. chemical bonds. b. nuclear energy. c. sharing nuclei. d. attractive forces.
#1: Which of the following is an exothermic reaction? A. dissolving ammonium nitrate in water to cool the water B. condensation C. melting ice D. dissolving sugar in water. #2: Two objects (A and B) of the same temperature are in contact with each other. Which of the following statements is true? A. Heat transfers from object B to object A, because molecules from B collide with those from A. B. Heat transfers from object A to object B, because molecules from A collide with those from B. C. Although the molecules collide, no heat transfers because there is no temperature difference between the objects. D. No heat transfers, because there are no collisions between the molecules of the objects. #3: Which of the following parameters is kept constant in a coffee-cup calorimeter? A. temperature B. volume C. pressure D. kinetic energy #4: What type of substance would be best for use in a heating system? A. a liquid with a high specific heat B. a solid with a high specific heat C. a liquid with a low specific heat D. a gas with a low specific heat. #5: The reaction 2 NO(g) → N2(g) + O2(g) has a ΔH = -180.5 kJ. How much heat will be required to produce 44.8 L of NO by the reverse reaction? A. 644 kJ B. 180.5 kJ C. 301 kJ D. 322.3 kJ
If water were a nonpolar molecule, how would its properties be different?

What type of claim must be supported by scientifically valid evidence for it to be approved for use on a food label? A. Health claim B. Nutrient content claim C. Structure/function claim D. EER

Answers

Option A. Health claim

Health claim must be supported by scientifically valid evidence to be approved in using for food label.

This is also a food guide to all consumers the food content implied by manufacturers to their products.

Answer is Health Claim

write a balanced chemical equation for the reaction of zncl2 with excess NaOH to produce Na2Zn(oh)4 sodium zincate. what mass of sodium zincate can be produced from 2.00 g of ZNCl2 with excess Naoh by this reaction?

Answers

$4NaOH _((aq)) + ZnCl_(2)_((aq)) ----\ \textgreater \ Na_(2)Zn(OH)_(4)_((ppt)) + 2NaCl (aq)$

$mol = (mass)/(molar mass)$
∴ $mol of ZnCl_(2) = (2.00 g)/([(65)+(35.5 * 2)g/mol)$
= $(2.00 g)/(136 g/mol)$
= 0.0147 mol

$Moles of Na_(2)Zn(OH)_(4) :$
$ratio of ZnCl_(2) : Na_(2)Zn(OH)_(4)$
1 : 1
∴ $Moles of Na_(2)Zn(OH)_(4) <span>$ = 0.0147 mol

Mass = Molar Mass * Mol
∴ $Mass of Na_(2)Zn(OH)_(4) <span>$ = [(23 * 2)+(65)+(16 * 4) + (1*4)] g/mol * 0.0147 mol
= 179 g/mol * 0.0147 mol
= 2.63 g

What occurs when NaCl(s) is added to water?(1) The boiling point of the solution increases, and the freezing pointof the solution decreases.(2) The boiling point of the solution increases, and the freezing pointof the solution increases.(3) The boiling point of the solution decreases, and the freezing pointof the solution decreases.(4) The boiling point of the solution decreases, and the freezing pointof the solution increases.

Answers

The answer is (1) Boiling point increases and freezing point decreases. This is a colligative property of solutions. When you add a solvent to a solution, the effect is twofold: boiling point elevation and freezing point depression. In effect, you broaden the range of temperatures over which the solution remains liquid. This is why you might see people putting antifreeze in their cars during the summer. While antifreeze does depress the freezing point of the engine oil, it also raises its boiling point, so it doesn't boil as easily during the summer when the engine may become especially hot.

The vapour pressure of the solution is decreased by sodium chloride. With a drop in vapour pressure, the boiling point rises. When sodium chloride is added to boiling water, the resultant solution's boiling point rises relative to that of pure water. Here the correct option is 1.

NaCl solution is created when NaCl is added to water. The solution exerts less vapour pressure than pure water because there are comparatively fewer water molecules at the liquid's surface. A decrease in the freezing point of water is seen as a result of this drop in vapour pressure.

When you add a solvent to a solution, the effect is two-fold: boiling point elevation and freezing point depression. The Boiling point increases and the freezing point decreases. This is a colligative property of solutions.

Thus the correct option is 1.

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Describe the results of Ernest Rutherford's gold-foil experiment and explain how his results changed ideas about the distribution of positive charge within the atom.

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Ernest Rutherford applies alpha particle towards an atom, some atom showed deflection by smaller angle, very few through large angle and many just passed without any deflection.

His results changed the idea for distribution of positive charges as he concluded almost all the positive charge is in center of the atom (inside nucleus) and it is very heavy than electrons which revolves outside the nucleus

Hope this helps!

Physicist Ernest Rutherford established the nuclear theory of the atom with his gold-foil experiment. When he shot a beam of alpha particles at a sheet of gold foil, a few of the particles were deflected. He concluded that a tiny, dense nucleus was causing the deflections.

Which laboratory test result can be used to determine if KCl(s) is an electrolyte?(1) pH of KCl(aq)
(2) pH of KCl(s)
(3) electrical conductivity of KCl(aq)
(4) electrical conductivity of KCl(s)

Answers

Answer: (3) electrical conductivity of KCl (aq)

Explanation: pH is the measure of acidity or alkalinity.

Conductance is the ability of a substance to be able to conduct electric current through it. Electrolyte is a solution which enables electric current to pass through them due to the presence of ions.

Ionic compounds do not conduct electricity in solid state as the ions are strongly held by strong coloumbic forces but in aqueous solutions they dissociate into ions and thus act as good conductors.

$KCl(aq)\rightarrow K^+(aq)+Cl^-(aq)$

The answer is (3) electrical conductivity of KCl(aq). The definition of electrolyte is that the substance that will ionize when dissolving in suitable ionizing solvent like water.

Which two ions have the same electron configuration?A) Na+ and O2- B) Li+ and F- C) Ca2+ and Br- D) Na+ and O3-

Answers

Answer: A) Na+ and O2-

Explanation:

To know the electronic configuration, one has to determine the numbers of electrons present in each atom.

Na+ means a sodium atom that has lost one valence electron. A Sodium atom initially has 11 electrons, but having lost an electron making it 10 electrons remaining with electron configuration of 1s2 2s2 2p6.

O2- means oxygen atom that has gained two valence electrons. An oxygen atom initially has 8 electrons, having gained two electrons makes it 10 electrons with electron configuration of 1s2 2s2 2p6. same as Na+

The purpose of gaining or losing electrons is to attain a stable duplet or octet structure.

The two ions with same electronic configuration are Na $^+$ and O² $^-$ .

What is electronic configuration?

Electronic configuration is defined as the distribution of electrons of an atom or a molecule in orbitals of an atom or of a molecule.It describes each electron which is moving independently in it's orbital.

Electrons are able to move from one configuration to another by either absorption or emission of a quantum of energy, which is called as a photon.It is useful in understanding the structure of periodic table.

Considering the pair of sodium cation and oxygen anion the sodium atom with one positive charge has 10 electrons and oxygen anion with two negative charge has 10 electrons .

The elements with same number of electrons are called isoelectronic species.

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Write a balanced chemical equation to show the reaction of naoh with the diprotic acid h2so4.