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stepladder [879]
3 years ago
13

In chemistry when using electrical equipment, what should you look for? ASAP! pls !

Chemistry
2 answers:
ra1l [238]3 years ago
6 0
Check if it’s in good condition

If not tell a teacher
nataly862011 [7]3 years ago
3 0

Answer:

Check if the equipment is in a good condition.

Check if it can cause any harmful hazards.

Check if the equipment is what you need for the experiment

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Which of the following is evidence of a chemical change?
krek1111 [17]
<span>the formation of a gas
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5 0
3 years ago
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Which statement about the reaction is correct?
Goshia [24]

The reactions based on the absorption and release of the energy are called endothermic and exothermic reactions. The reaction is exothermic.

<h3>What is an exothermic reaction?</h3>

Exothermic reactions are the reaction in which the reactant produces products that release energy from the system to the surroundings. In the reaction bond energy of the reactant is less than the product.

Energy from the system is released in the form of heat, sound, light and electricity. The weak bonds of the compounds are replaced with stronger ones and the standard enthalpy of the reaction is negative.

Therefore, option c. reaction is exothermic is correct.

Learn more about the exothermic reactions here:

brainly.com/question/26616927

7 0
2 years ago
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If the molecular weight of a semiconductor is 27.9 grams/mole and the diamond lattice constant is 0.503 nm, what is the density
adelina 88 [10]

Explanation:

The given data is as follows.

      Mass = 27.9 g/mol

As we know that according to Avogadro's number there are 6.023 \times 10^{26} atom present in 1 mole. Therefore, weight of 1 atom will be as follows.

            1 atoms weight = \frac{38}{6.023 \times 10^{26}}    

In a diamond cubic cell, the number of atoms are 8. So, n = 8 for diamond cubic cell.

Therefore, total weight of atoms in a unit cell will be as follows.

            = \frac{8 \times 27.9 g/mol}{6.023 \times 10^{26}}

            = 37.06 \times 10^{-26}

Now, we will calculate the volume of a lattice with lattice constant 'a' (cubic diamond) as follows.

                   = a^{3}

                   = (0.503 \times 10^{-9})^{3}

                   = 0.127 \times 10^{-27} m^{3}

Formula to calculate density of diamond cell is as follows.

               Density = \frac{mass}{volume}

                             = \frac{37.06 \times 10^{-26}}{0.127 \times 10^{-27} m^{3}}

                            = 2918.1 g/m^{3}

or,                         = 0.0029 g/cc       (as 1 m^{3} = 10^{6} cm^{3})

Thus, we can conclude that density of given semiconductor in grams/cc is 0.0029 g/cc.

4 0
3 years ago
35 cm3 of a metal has a mass of 121 grams. whats is its density?
dusya [7]

Answer:

The density of the metal is 3.457 g/cm³.

Explanation:

Given,

mass of metal = 121 grams

Volume = 35 cm³.

Density = ?

Density of the metal can be found by using the formula

Density = Mass/Volume

Substituting the values,

Density = 121/35 = 3.457 g/cm³.

5 0
3 years ago
BrainlieSTTTTTT A gas is originally stored at a pressure of 25 atm with a volume of 3 L. If the pressure were increased to 75 at
Crazy boy [7]

Explanation:

Apply Boyle's Law :-

P1V1 = P2V2

  • Where P1 is 25 atm
  • V1 is 3L
  • P2 is 75 atm
  • V2 is what we need to find out.

25 × 3 = 75 × V2

\tt{V_2 = \dfrac{ 25 \times 3}{75}}

\tt{V_2 = \dfrac{75}{75}}

<u>So, the answer is d) Part, 1L .</u>

Hope it helps :)

3 0
3 years ago
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