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NISA [10]
2 years ago
6

According to the law of conservation of matter, the number of_______is not changed by a chemical reaction

Chemistry
1 answer:
nikdorinn [45]2 years ago
6 0

Answer:

Atoms

Explanation:

According to the law of conservation of matter, matter is neither created nor destroyed, so we must have the same number and kind of atoms after the chemical change as were present before the chemical change.

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trasher [3.6K]

Answer: C, neap tide

Explanation:

4 0
2 years ago
Determine the volume, in liters, occupied by 0.015 molecules of oxygen at STp?
Arlecino [84]

5.58 X 10^{-25} Litres is the volume, in liters, occupied by 0.015 molecules of oxygen at STP.

Explanation:

Data given:

molecules of oxygen = 0.015

number of moles of oxygen =?

temperature at STP = 273  K

Pressure at STP = 1 atm

volume = ?

R (gas constant) = 0.08201 L atm/mole K

to convert molecules to moles,

number of moles = \frac{molecules}{Avagadro's number}

number of moles = 2.49 x 10^{-26}

Applying the ideal gas law since the oxygen is at STP,

PV = nRT

rearranging the equation:

V = \frac{nRT}{P}

putting the values in the rearranged equation:

V = \frac{2.49 X10^{-26}   X 0.08201 X 273}{1}

V = 5.58 X 10^{-25} Litres.

5 0
3 years ago
How many moles of helium are needed to fill a balloon to a volume of 5.3 L at 22 ℃ and 632 mmHg?
son4ous [18]

Answer:

0.18 moles

Explanation:

Applying,

PV = nRT................... Equation 1

Where P = pressure, V = volume, n = number of moles, R = molar gas constant, T = temperature.

make n the subject of the equation

n = PV/RT............... Equation 2

Given: V = 5.3 L, T = 22 °C = (22+272) K = 295 K, P = 632 mmHg = (0.00131579×632) = 0.8316 atm,  R = 0.083 L.atm/K.mol

Substitute these values into equation 2

n = (0.8316×5.3)/(0.083×295)

n = 0.18 moles

6 0
3 years ago
Find the mass of 5.82 mol of MgCl2. Round to the nearest tenth.
Oksana_A [137]

Answer:

554.13 grams

Explanation:

8 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
3 years ago
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