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Leona [35]
4 years ago
8

What is the meaning of radioactive substance​

Chemistry
2 answers:
Oksana_A [137]4 years ago
8 0

Explanation:

  1. He atoms that decay naturally are called radioactive substances
Tasya [4]4 years ago
7 0

Answer:

Explanation:

Radioactive substances are atoms that decay naturally. They can give off alpha particles, beta particles and gamma radiation.

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If you collect 1.75 L of hydrogen gas during a lab experiment, when the room temperature is 23ºC and the barometric pressure is
Marianna [84]

Answer:

n=0.0747mol

Explanation:

Hello,

In this case, since we can consider hydrogen gas as an ideal gas, we check the volume-pressure-temperature-mole relationship by using the ideal gas equation:

PV=nRT

Whereas we are asked to compute the moles given the temperature in Kelvins, thr pressure in atm and volume in L as shown below:

n=\frac{105kPa*\frac{0.009869atm}{1kPa}*1.75L}{0.082\frac{atm*L}{mol*K}*(23+273.15)K} \\\\n=0.0747mol

Best regards.

6 0
3 years ago
Write a short paragraph on the harms caused by microorganisms<br>​
lutik1710 [3]

Answer:

Some serious diseases like anthrax is also caused in animals by the microbes. Microbes also cause diseases of plants like blights in potatoes, sugarcanes, oranges etc. They also reduce the yield. Microbes grow on food products and render them unfit for consumption.

Explanation:

5 0
3 years ago
Which feature do all adult echinoderms have?
Rama09 [41]

The common name to the family member of phylum Echinodermata of marine family is echinoderm. They are usually characterized by a five-fold symmetry, and possess an internal skeleton of calcite plates.  They are found at every ocean depth.

The features of all adult echinoderm are:

- They have a five-fold symmetry.

- Body without segmentation.

- Spiny skin.

- Internal skeleton.

- found at every ocean depth.

4 0
3 years ago
Read 2 more answers
A mixture of hydrogen and oxygen gases has a total pressure of 5.50 atm. What is the partial pressure of the hydrogen if the P(O
Sloan [31]

Answer:

P O 2 = 5.21 atm P C O 2 = 4.79 atm

Explanation:

Hope it helps!

6 0
3 years ago
A reaction between 46 grams of sodium and 71 grams of chlorine formed table salt and heat.
vazorg [7]

Answer:

d. 117 grams

Explanation:

The mass of the table salt produced will be 117 grams.

Chemical reactions obey the law of conservation of mass. In this regard, matter is neither created nor destroyed in the course of a chemical reaction. It is expected that the mass of the reactants and products remain the same.

 The reaction expression:

         2Na + Cl₂  →   2NaCl

So, mass of sodium  = 46g

      mass of chlorine formed = 71g

Mass of NaCl  = 46 + 71 = 117g

7 0
3 years ago
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