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Soloha48 [4]
3 years ago
11

Resistance of a material being scratched in known as

Chemistry
2 answers:
Wittaler [7]3 years ago
3 0
Resistance of a material being scratched in known as: Hardness
ddd [48]3 years ago
3 0

Answer:

Hardness

Explanation:

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Drag the correct label to the pictures. Each label can be used more than once. Classify the materials based on their composition
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I know, it's hard!!

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Which of the following is a period 4 representative element?
kondor19780726 [428]

\huge{\mathbb{\tt { QUESTION↓}}}

Which of the following is a period 4 representative element?

O A. C

O B. An

O C. Ti

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\huge{\mathbb{\tt {ANSWER↓}}}

\color{blue}{\tt {A.C ( Carbon )}}

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  • Carbon (from Latin: carbo "coal") is a chemical element with the symbol C and atomic number 6. It is nonmetallic and tetravalen - making four electrons available to form covalent chemical bonds. It belongs to group 14 of the periodic table. Carbon makes up only about 0.025 percent of Earth's crust.

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4 0
3 years ago
Guys please I need an answer for this asap
nadya68 [22]

Answer:

Mass of hydrogen gas produced = 0.2 g

Explanation:

Given data:

Number of moles of Mg = 0.2 mol

Number of moles of HCl = 0.2 mol

Mass of hydrogen gas produced = ?

Solution:

Chemical equation:

Mg + 2HCl       →     MgCl₂ + H₂

Now we will compare the moles of of hydrogen with Mg and HCl.

                   Mg          :        H₂

                    1             :         1

                   0.2          :       0.2

                 HCl           :       H₂

                   2             :         1

                0.2            :         1/2×0.2 = 0.1

HCl produced less number of moles of hydrogen gas it will act as limiting reactant.

Mass of hydrogen:

Mass = number of moles × molar mass

Mass = 0.1 mol × 2 g/mol

Mass = 0.2 g

4 0
3 years ago
Which of these are true for the reaction above?
agasfer [191]

Answer:

a, d, f

Explanation:

ΔHrxn = ΔH(CCl4) -ΔH(CH4) = - 106.7 -(-74.8) = - 31.9 kJ/mol

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4 years ago
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