How much heat is released or absorbed (in kJ) by the system in the reaction of 17.7 g of SF6 with 23.7 g of H2O?

1. Bailey wants to find out which frozen solid melts the fastest: soda, gatorade, or orange juice. She pours each of the three l

VMariaS [2998]

First scenario:

IV: soda, gatorade, orange juice, and water

DV: state of the liquids listed above

Control: freezer and ice tray

Second scenario:

IV: laundry detergent, water

DV: cleanliness of the squares post-wash

Control: chocolate, cloth type, cloth squares

Third scenario:

IV: type of water used, pea plant

DV: growth of the pea plant

Control: pots and daily water amount for the plant

4 0

4 months ago

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Find the age ttt of a sample, if the total mass of carbon in the sample is mcmcm_c, the activity of the sample is AAA, the curre

castortr0y [3046]

Answer:

Explanation:

In a desert cave, an artifact has been discovered. The anthropologists investigating this artifact want to determine its age. They note that the current activity level of the artifact is 9.25 decays/s, and the carbon mass present is 0.100 kg. To ascertain the artifact's age, they will employ specific constants:

r=1.2

The formula for carbon 14 activity is

$A=A_0e^{\lambda t}$

where,

$A_0$ is the initial activity of the substance

Now, solve for t

$-\lambda t=In\frac{A}{A_0}$

$t=-\frac{1}{\lambda} In(\frac{A}{A_0} )$

$=-\frac{1}{\lambda} In(\frac{A}{\lambda r(\frac{m_c}{m_a} )} )$

since,

$A_0=\lambda r(\frac{m_c}{m_a} )$

$=-\frac{1}{\lambda} In(\frac{A\ m_a}{\lambda r m_c} )$

Thus, the age of the artifact is

$=-\frac{1}{\lambda} In(\frac{A\ m_a}{\lambda r m_c} )$

$=-\frac{1}{1.21\times 10^{-4}} In(\frac{(9.25)(2.32\times 10^{-26}}{1.21\times 10^{-4}(\frac{1}{3.15569\times10^7} )(1.2\times 10^{-12})(0.100)}} )\\\\=6303.4 \ years$

to two significant figures = 6300 years

4 0

3 months ago

Hurry!!!!!!!!!!!!!!! Match the terms to the correct descriptions.

Tems11 [2777]

The types of energies or the terms in this prompt correspond with the provided descriptions. Here are the lists: 

a. The term that aligns most closely with this definition is MECHANICAL energy. Typically, mechanical energy refers to energy attributable to a body based on its movement and position. 

b. The term associated with this item is LIGHT energy. This energy can be generated from various sources (e.g., radiation, chemical, and mechanical) and is emitted by hot objects like the sun, lasers, and bulbs.

c. Energy transferred by moving electrons through a conductor is known as ELECTRICAL energy. The flow of electrons along a conductor is commonly termed current. Furthermore, this energy type also represents kinetic energy due to electron motion; thus, quicker electron movement results in higher energy. 

d. The energy contained in batteries or food is referred to as CHEMICAL energy. This energy is stored within the bonds of various chemical compounds and is predominantly released during reactions between elements or compounds.

e. Energy that propagates through vibrations and waves is called SOUND energy. This energy type relates to the movements or vibrations of matter and is classified as mechanical energy due to the waves produced by the vibrations.

f. NUCLEAR energy refers to the energy located in an atom's nucleus. Nuclear reactions frequently release this type of energy alongside the generation of heat. 

g. The conserved energy is designated as POTENTIAL energy. Its formula is mgh, with h representing height related to the object's position. Upon release, this energy converts into other forms. 

h. The term that matches this item is THERMAL energy. This energy can be transferred in three distinct methods: (1) conduction, (2) convection, and (3) radiation.

3 0

2 months ago

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