Chemistry » Page 21

Laurel Valenzuela

Chemistry

Rocks formed by changes in heat and pressure or the presence of hot

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Chemistry

Examine the equation

Fe + Cu (NO3) 2

Fe (NO3) 2 + Cu

What is the best classification for the equation's reaction?

single displacement

double-displacement

synthesis

combustion

decomposition

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Chemistry

Which of the following materials is a substance. air gasoline stainless steel or silver

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Chemistry

Karl puts a piece of ice in a small plastic bottle without a cap, and finds that the mass of bottle and ice is 18.1 g. Several hours later he finds that the mass of the bottle and water is 17.8 g. From these measurements, which of the following most likely happened?

A

The density of the ice decreased as it melted.

B

Some water evaporated from the bottle.

C

Water condensed on the bottle from the air.

D

Mass was not conserved when the ice melted.

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Chemistry

What happens when energy is transferred through a wave?

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Chemistry

In an aqueous chloride solution cobalt (ii) exists in equilibrium with the complex ion cocl42-. co2 + (aq) is pink and cocl42 - (aq) is blue ... at low temperature the pink color predominates ... at high temperature the blue color is strong ... if we represent the equilibrium as: ... co2 + (aq) + 4cl - (aq) cocl42 - (aq) we can conclude that: 1. this reaction is:

a. exothermic

b. endothermic

c. neutral

d. more information is needed to answer this question.

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Chemistry

Which explains why carbon is a component of so many elements?

A. It appears in more than one form

B. It is the most abundant element

C. It can react with both metals and nonmetals

D. It can form stable compounds with other elements

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Chemistry

A positively charged ion has

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Chemistry

Which property of gases allows them to be stored at high concentrations in a bottle of air freshener?

What changes occur at the molecular level when ice cream melts and forms a liquid?

"Highest molecular motion, highest kinetic energy, no forces of attraction, least dense packaging of molecules." Which state of matter is defined by this description?

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Chemistry

How many protons does the boron atom have?

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Chemistry

Consider the reaction, 2 d (g) + 3 e (g) + f (g) = > 2 g (g) + h (g) when h is increasing at 0.64 mol/ls, how quickly is e decreasing? give your answer to 3 decimal places.

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Eliezer Murillo

Chemistry

A partir de la desintegración del Virreinato del Río de la Plata y durante todo el siglo XXI, los nuevos Estados nacionales que iban surgiendo, intentaron fijar sus fronteras verdadero o falso?

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Chemistry

Hardness of metals can be decreased by: (a) adding interstitial alloying elements (b) making glassy metals through extremely high cooling rates (c) annealing using slow cooling from high temperatures (d) cold-working or deforming at low temperatures

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Chemistry

How many protons are located in the nucleus of an atom of sodium (na)

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Chemistry

What 2 things have to increase for metamorphisim to occur

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