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3 years ago

Can mixtures and compounds be separated into their elements? If so which?

Chemistry

1 answer:

Mnenie [13.5K]3 years ago

8 0

Answer:

The individual components of a mixture can be physically separated from each other. Chemical compounds are very different from mixtures: The elements in a chemical compound can only be separated by destroying the compound.

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Water molecules stick together by a force called?

patriot [66]

Answer:

Cohesion

Explanation:

Depending on how attracted molecules of the same substance are to one another, the substance will be more or less cohesive. Hydrogen bonds cause water to be exceptionally attracted to each other. Therefore, water is very cohesive.

8 0

4 years ago

Read 2 more answers

The total surface area for the Asia consisting of forest, cultivated land, grass land, and desert is approximately 4.46 x 107 km

tester [92]

Explanation:

We calculate the amount of carbon fixed as follows.

$455 \times 10^{3} kg/km^{2} \times 4.46 \times 10^{7} km^{2}$

= $2029.3 \times 10^{10}$ kg

$\Delta H_{f}_{C_{6}H_{12}O_{6}}$ = -1273.1 kJ/mol

$\Delta H_{f}_{CO_{2}}$ = -393.5 kJ/mol

$\Delta H_{f}_{H_{2}O}$ = -285.8 kJ/mol

Hence, total $\Delta H$ reaction will be as follows.

$\Delta H_{rxn} = (\Delta H_{f}_{C_{6}H_{12}O_{6}}) - 6(\Delta H_{f}_{CO_{2}}) - 6(\Delta H_{f}_{H_{2}O})$

= $-1273.1 kJ/mol - (6 \times 393.5 kJ/mol) - (6 \times 285.8 kJ/mol)$

= 2802.7 kJ/mol

Therefore, calculate the number of moles of fixed carbon as follows.

$n_{c, fixed} = \frac{m_{c, fixed}}{\text{Molar mass of C in kg/mol}}$

= $\frac{4.55 \times 10^{5}kg km^{-2} year^{-1}}{12.01 \times 10^{-3} kg/mol}$

= $3.786 \times 10^{7} mol km^{-2} year^{-1}$

Thus, we can conclude that the annual enthalpy change resulting from the photosynthetic carbon fixation over the land surface is $3.786 \times 10^{7} mol km^{-2} year^{-1}$ .

7 0

3 years ago

DEFINE THESE WORDS FOR A TON OF POINTS!!!!!!!

PilotLPTM [1.2K]

Hi , these are the definitions
Chemistry; the science that deals with the composition and properties of substances and various elementary forms of matter.
aquatic system ; ecosystem in a body of water , communities and organisms that are dependent on each other.
depth ; the distance from the top to the bottom of something .
geography ; the study of the earth s physical features and the people ,plants , and animals.
light ; brightness from the sun or from a light.
medium ; between small and large in size.
period ; the name given to a horizontal row of the periodic table.
properties ; attributes of a substance.
refraction ; the change of direction of a ray of light , sound , heat ....
reflection ; reflection is when infrared waves bounce from a surface .
salinity ; a saline substance or a liquid that contains salt.
pressure ; measure of the force applied over an unit area .
photosynthesis ; the process used by plants , algae , and certain bacteria to harness energy from sunlight into chemical energy.
thermocline ; an abrupt temperature gradient in a body of water .
intertidal ; relating to the region between the hide tide mark and the low tide mark .
benthic ; relating to the bottom of a sea or a lake or to the organisms that live there .
pelagic ; relating to or living in the sea far from the shore.
epipelagic ; relating to or inhabiting the uppermost layer of the water column of the open ocean , into which enough sunlight enters for photosynthesis to take place.
mesopelagic ; relating to or inhabiting the layer of the water column in the open sea that lies between the epipelagic and bathypelagic layers at depths of about 200 to 1,000 meters.
bathypelagic ; relating to or inhabiting the layer of the water column of the open sea that lies between the mesopelagic and abyssopelagic layers at depths of about 1,000 to 4,000.
abyssopelagic ; refering to or occurring in the region of deep water above the floor of the ocean .
neritic ; region of water lying directly above the sub littoral zone of the sea bottom .
photic ; pertaining to the generation of light by organisms .
aphotic; zone of an ocean , lowest level at which photosynthesis can take place .
commensalism ; type of a relationship between a plant , an animal , fungus , etc.
competition ; the struggle among organisms .
freshwater systems ; subset of earth s aquatic ecosystems .
marine systems ; inside aquatic system , marine systems include oceans , seas ,etc.
mutual ism ; relation between species of organisms in which both benefit from the association.
organism ; a system with many parts that depends on each other and work together.
parasitism ; the behavior of a parasite .
predation; preying or plundering.
relationships ; the way in which two things are connected .
terrestrial systems ; an ecosystem only found on land forms.

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4 0

4 years ago

Density is an intensive physical property because the density of a given substance does not change with the size of the sample.

almond37 [142]

True

Density = mass/volume

Suppose that a block has a mass of 20 g and a volume of 20 cm^3.

Density = 20 g/20 cm^3 = 1 g/cm^3

Now, you cut the block in half. The half-block has a mass of 10 g and a volume of 10 cm^3.

The density of the half-block is

Density = 10 g/10 cm^3 = 1 g/cm^3

The density <em>stays the same</em>, even though the size of the sample has changed.