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alekssr [168]
3 years ago
10

HELP ASAP PLEASE I'LL GIVE BRAINLIEST

Chemistry
2 answers:
Furkat [3]3 years ago
8 0

Answer:

Radiowave,Microwave, Infared,UV,X-Ray, Gamma

Reptile [31]3 years ago
5 0

radio,microwave, ultraviolet,x ray,gamma ray

Explanation:

I looked it up at a NASA link

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7th grade Sem 1
Murrr4er [49]

Answer: Water

Explanation: During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil

4 0
3 years ago
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In Chromium-53, the "53" represents the
alina1380 [7]

Answer:

The differemt isotopes that differ in atomic mass

Explanation:

4 0
2 years ago
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Jon is running for city council and wants to campaign on human development goals for his community. Which issue should he use? A
kotegsom [21]

Answer:

E. better schools

Explanation:

This contributes the most to human development in his community because it provides children with more resources and better opportunities than a sub-par education system. If a community is able to better their school system, they will begin to see a lot of positive changes in their area.

6 0
3 years ago
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The average propane cylinder for a residential grill holds approximately 18 kg of propane. How much energy (in kJ) is released b
brilliants [131]
Combustion is a chemical reaction between a fuel and an oxidant, oxygen, to give off combustion products and heat. Complete combustion results when all of the fuel is consumed to form carbon dioxide and water, as in the case of a hydrocarbon fuel. Incomplete combustion results when insufficient oxygen reacts with the fuel, forming soot and carbon monoxide. 

The complete combustion of propane proceeds through the following reaction:
C_{3} H_{8} + 5O_{2} --> 3CO_{2} + 4H_{2}O

Combustion is an exothermic reaction, which means that it gives off heat as the reaction proceeds. For the complete combustion of propane, the heat of combustion is (-)2220 kJ/mole, where the minus sign indicates that the reaction is exothermic. 

The molar mass of propane is 44.1 grams/mole. Using this value, the number of moles propane to be burned can be determined from the mass of propane given. Afterwards, this number of moles is multiplied by the heat of combustion to give the total heat produced from the reaction of the given mass of propane.

 14.50 kg propane  x <u> 1000 g </u> x <u>  1 mole propane   </u>  x <u>  2220 kJ  </u>   
                                     1 kg              44.1 g                     1 mole

= 729,931.97 kJ
8 0
3 years ago
Calcium carbonate is a compound that is used to make chalk for drawing on rocks or pavement. One molecule has one atom of calciu
Black_prince [1.1K]

Answer:

the chemical formula is caca3

6 0
3 years ago
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