Classify each of the following as a pure substance or a mixture; if it is a mixture, state whether it is heterogeneous
1 answer:
Answer:
(a) Heterogeneous mixture; (b) heterogeneous mixture;
(c) heterogeneous mixture; (d) homogeneous mixture; (e) pure substance.
Explanation:
(a) Concrete
Heterogeneous mixture. Concrete is a mixture of sand, gravel, and crushed stone held together with a cement.
In a heterogeneous mixture, you can see definite boundaries between the various components.
(b) Tomato juice
Heterogeneous mixture. It consists of water, tomato pulp, salt, and other substances.
(c) Marble
Heterogeneous mixture. It consists mostly of CaCO₃, but it usually contains other substances such as mica, quartz, pyrite, and iron oxides.
(d) Seawater
Homogeneous mixture. Seawater is an aqueous solution of NaCl along with other ions like Mg²⁺, Ca²⁺ ,and SO₄²⁻.
(e) Iron
Pure substance. Iron is an element. It consists only of Fe atoms.
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Answer:
<h3>The answer is 32 g/cm³</h3>Explanation:
The density of a substance can be found by using the formula
From the question
mass = 768 g
volume = 24 cm³
We have
We have the final answer as
<h3>32 g/cm³</h3>Hope this helps you
has 37 electrons in the orbit about its nucleus.
Atomic mass is the total number of neutrons and protons present in the nucleus of an element.
The atomic number is the total number of protons present in the nucleus of an element.
For writing an atomic symbol, atomic mass is written on the top left of the atomic symbol, and the atomic number is written on the downside of the left of the symbol.
An electrically neutral atom is an atom that has an equal number of electrons as well as protons.
Thus from the above conclusion we can say that has 37 electrons.
Learn more about Atomic mass and atomic number here:
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