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3 years ago

Could a mixture be made up of only elements and no compounds? Explain.

2 answers:

5 0

No. that's why it is called a mixture. If it were called a compound it could be made up of different elements, but a mixture is irreversible and I made up of elements and compounds.

Art [367]3 years ago

3 0

<span>Yes. A mixture in definition is a combination of two or more elements or compounds. Hence in combining these elements, mixture is another set of chemical bonding, separately and divergent. Compounds are not necessary to form mixtures. There is an “or” in the said definition and certain authors to support this claim. These includes examples that can state clearly this argument, table salt as a mixture of independent elements, Na and Cl. Brass is composed of zinc and copper. Steel is from carbon and iron. Lastly, you can have gold, nickel and palladium or platinum to form white gold. </span>

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What is the balanced chemical equation for the reaction used to calculate ΔH∘f of SrCO3(s)? If fractional coefficients are requi

Pani-rosa [81]

Answer:

Sr(s) + C(s) + 3/2 O₂(g) → SrCO₃(s)

Explanation:

The standard enthalpy of formation (ΔH°f) is the energy involved in the formation of 1 mole of a substance from its elements in their most stable states. The chemical equation for the formation of SrCO₃(s) is the following.

Sr(s) + C(s) + 3/2 O₂(g) → SrCO₃(s)

6 0

3 years ago

The net force on an object that is accelerating at a rate of 4 m/sec is 255 N. What is the mass of the object in kg?

aleksklad [387]

Answer:

Given - acc = 4 m/ s^2

Force = 255 N

To find = mass

Solution -

Using the formula,

$f = m \times a$

255 = Mass × 4

255 /4 = Mass

63.75 = Mass

1 N = kg m/s^2

63.75 kg = Mass

7 0

3 years ago

What is 21.97 to three significant figures

antiseptic1488 [7]

21.97

Sig Figs

Decimals

Scientific Notation

2.197 × 101

Answer:

Explanation:

7 0

3 years ago

Read 2 more answers

Single stranded___ molecules translate he code for making protein

Radda [10]

Answer:

RNA

Explanation:

Central dogma is the process of the formation of protein from the sequence of nucleotide on DNA. It consists of two further processes Transcription and translation.

During Transcription, the information from the DNA sequence is transcripted in a sequence of RNA, that is single stranded and contains Uracil instead of Thymine. During Translation, the information from the RNA sequence is translated into a sequence of amino-acid, and a protein.

Hope it helps!

6 0

3 years ago

Read the given equation. 2Na + 2H2O → 2NaOH + H2

Crank

Answer:

B) 12.9 grams.

Explanation:

How many moles of molecules in that 6.30 L of H₂?

The volume of one mole of an ideal gas at STP (0 °C, 1 atm) is 22.4 liters.

(The volume of that one mole of gas at STP will be 22.7 liters if STP is defined as 0 °C and 10⁵ Pa).

$\displaystyle n(\text{H}_2) = \frac{6.30\;\text{L}}{22.4\;\text{L}\cdot\text{mol}^{-1}} = 0.28125\;\text{mol}$ .

How many moles of Na will be needed?

The coefficient in front of Na in the equation is twice the coefficient in front of H₂. It takes two moles of Na to produce one mole of H₂.

$n(\text{Na}) = 2\;n(\text{H}_2) = 2\times 0.28125= 0.5625\;\text{mol}$ .

What's the mass of that many Na atoms?

Refer to a modern periodic table. The molar mass of ₁₁Na is 22.990. The mass of one mole of Na atoms is 22.990 gram. The mass of 0.5625 moles of Na atoms will be

$m = n\cdot M = 0.5625 \times 22.990 = 12.9\;\text{g}$ .

(2 sig. fig. as in the volume of the H₂ gas.)

6 0

3 years ago