CHEMISTRY HIGH SCHOOL

What role does the salt bridge play in voltaic cell

Answers

Answer 1
Answer:

Answer:

It allows migration of ions from one half–cell to the other.

Explanation:
Answer 2
Answer: it provides the electric current, i.e. the positive and negative charges across the cell

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Which balanced equation represents a redoxreaction? (1) CuCO3(s) ==> CuO(s) + CO2(g) (2) 2KClO3(s)==>2KCl(s) + 3O2(g) (3) AgNO3(aq) + KCl(aq) ==>AgCl(s) + KNO3(aq) (4) H2SO4(aq) + 2KOH(aq)==> K2SO4(aq) + 2H2O(l)
He conjugate pair for a weak acid is--
Among the factors that affect the solubility of a substance are type of solvent and temperature.
The decayed organic material that gives soil its dark brown or black color is calledA) clay. B) humus. Eliminate C) loam. D) silt.
What is the law of conservation of mass

Hard water contains calcium and magnesium, which undergo oxidation andclog water pipes. Which statement best describes this change as a chemical change?

A.Calcium and magnesium dissolve in water.

B.Calcium and magnesium evaporate on contact with the walls of the pipe.

C.Calcium and magnesium form precipitates of their respective oxides.

Answers

It's C, calcium and magnesium form precipitates of their respective oxide

Final answer:

The statement 'Calcium and magnesium form precipitates of their respective oxides' best describes the chemical change as it involves a reaction that transforms the calcium and magnesium into new compounds, their oxides, which can clog pipes.

Explanation:

The statement that best describes this change as a chemical change is C. Calcium and magnesium form precipitates of their respective oxides. This represents a chemical change because it involves a reaction that transforms the calcium and magnesium into new substances - their oxides. Here's how it works: in the presence of oxygen, calcium and magnesium in hard water can undergo an oxidation process. During this oxidation, the calcium becomes calcium oxide and the magnesium becomes magnesium oxide. These oxides are less soluble in water and form precipitates, which can accumulate and clog the pipes.

Learn more about Chemical change here:

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How do plants store glucose?

Answers

The model of photosynthesis used by biologists begins when chlorophyll splits a water molecule into hydrogen and oxygen. The oxygen from the water is a waste product that is released as a gas. In later stages of photosynthesis, carbon dioxide from the air and hydrogen from the water unite to form glucose. Photosynthesis usually takes place in the leaves of green plants. The food produced is a simple sugar called glucose. Some of the food made during  photosynthesis is used by plants for their growth and development. The rest is stored in the plant.

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

Hunter wants to measure the weight of a dumbbell.he should A. use a beaker with water and record the weight in N.
B. use a scale and record the weight in CM.
C.use a beaker with water and record the weight in CM.
D. use a scale and record the weight in N.

Answers

He should use a scale and record the weight in N. The beaker is used for liquid measurement and the scale is used for measuring sold things. A dumbbell is not a liquid material that is why the need of the scale will give it the accurate measurement that Hunter wants to know.

Answer:

use a scale and record the weight in N.

Explanation:

If an ice cube melts at 0oC but water also freezes at 0oC, what is the difference between melting and freezing in terms of (a) the energy involved in the phase changes and (b) particles of the substances during the phase changes?

Answers

The energy involved in melting in freezing is heat, At 0 degrees Celsius ice is at an equilibrium where the heat energy absorbed during melting (endothermic) and heat energy dispersed during freezing (exothermic). When ice melts its absorbs heat energy to change states, when water freezes to ice it dispersed heat energy so that the particles can move slow enough to be almost frozen, but still very small vibrations throughout the ice. Particles in the frozen state are packed tightly and help together by a crystal lattice and IMF's, liquid is free flowing with free floating particles that can move freely from one another particle. 

The emission spectrum of hydrogen shows discrete, bright, colored lines. Which characteristic of the Bohr model is best supported by this observation?

Answers

Answer : Electrons cannot exist in locations other than in specific orbits.

Explanation :

The emission spectrum of hydrogen shows discrete, bright, colored lines. The characteristic that the Bohr model supported with observation is that electrons cannot exist in location other than in specific orbits.

According to characteristics of Bohr's atomic model;

  • The energy levels of electrons are discrete, this is the reason which is shown by hydrogen emission spectrum as discrete, bright, colored lines.
  • Also, electrons are seen to orbit around the nucleus in orbits which has a set size and energy with a defined path.
  • Electrons can jump from one energy level to another, which results after absorbing or emitting an electromagnetic radiation with a frequency ν.
The characteristic of the Bohr model that would best support his observation is this assumption: "The energy of the electron in an orbit is proportional to its distance from the nucleus. The further the electron is from the nucleus, the more energy it has." The discrete, bright, colored lines might represent the electrons and its distance from the nucleus. The lights are caused by the energy it has.
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