liquid to solid i think
the answer is liquid to gas :)
Answer:The mineral that reacts to hydrochloric acid (HCl) only when powdered is calcite. Calcite is a carbonate mineral composed of calcium carbonate (CaCO3). When calcite is in its powdered form, it readily reacts with hydrochloric acid to produce carbon dioxide (CO2), water (H2O), and calcium chloride (CaCl2). This reaction can be described by the chemical equation:
CaCO3 (s) + 2HCl (aq) → CO2 (g) + H2O (l) + CaCl2 (aq)
The reaction occurs because the surface area of the powdered calcite is increased, allowing for a greater contact area between the mineral and the hydrochloric acid. This increased contact area facilitates a faster and more vigorous reaction compared to when the calcite is in its solid, non-powdered form.
It's important to note that not all minerals react with hydrochloric acid. Only minerals that contain carbonate ions (CO3^2-) will react with hydrochloric acid to produce carbon dioxide gas. Other common minerals that exhibit this reaction include limestone and marble, which also contain calcium carbonate.
By understanding this reaction and its characteristics, you can identify calcite and other carbonate-containing minerals by their reaction to hydrochloric acid when in powdered form.
Calcite is a mineral that reacts to hydrochloric acid (HCl) only when powdered. This reaction produces carbon dioxide gas.
The mineral that reacts to hydrochloric acid (HCl) only when powdered is calcite.
When solid calcite is exposed to hydrochloric acid, it does not undergo any noticeable reaction. However, when powdered calcite is mixed with HCl, it readily fizzes and releases carbon dioxide gas.
This reaction occurs because the acid dissolves the calcite, converting it into dissolved calcium ions and carbon dioxide gas.
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Answer:
Hygroscopic substances
Explanation:
Hygroscopic compounds are those that absorb moisture and a large amount of water and they become wet. They should not be confused with deliquescent substances that absorb water and forms solution.
Hygroscopic substances froms pasty substances and not solution while the liquid ones only becomes diluted. Examples are sodium trioxonitrate(v) (NaNO₃), copper (ii) oxide CuO, and concentrated tetraoxosulphate (vi) acid (H₂SO₄)
Hydrophilic substances, like cellulose found in cotton and paper pulp, can soak up large amounts of water. Some chemical compounds, such as sodiumcarbonate decahydrate and copper(II) sulfate pentahydrate, have this property. Moreover, phosphorus(V) oxide, although used for removing water from compounds, also shows a great affinity for water.
A compound that has the ability to soak up large amounts of water is termed a hydrophilic substance. Hydrophilic substances are attracted to water, absorbing it readily. For example, cotton and paper pulp, used in towels, are made of molecules of cellulose that contain many –OH groups.
Water molecules are attracted to these -OH groups and form hydrogen bonds with them, drawing large amounts of H₂O up the cellulose fibers. Additionally, some compounds like sodium carbonate decahydrate and copper(II) sulfate pentahydrate also have the ability to soak up water. Another example is phosphorus(V) oxide, which has a great affinity for water and is used for removing water from compounds.
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Answer:
The correct answer is D.
Explanation:
A chemical compound is any substance composed of identical molecules formed by atoms of two or more chemical elements. All matter in the universe is composed of atoms of more than 100 different chemical elements. These elements are found in pure form and combined form in chemical compounds.
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(2) The nucleus is positive and the electron cloud is negative.
(3) The nucleus is negative and the electron cloud is positive.
(4) The nucleus is negative and the electron cloud is negative.
Atoms are made of nucleus and electrons. Nucleus have a positive charge due to the presence of protons and electrons are negative in charge . Thus option 2 is correct.
Atoms are the basic unit every substance. Atoms combines to form molecules and compounds. An atom is made of nucleus and surrounding electrons which are revolving through a circular path of fixed energy.
Nucleus is the core of the atom and the 90% of the weight of atom is centered in the nucleus and it contains positively charged protons and neutral particles neutrons.
The nuclear model of atom was first proposed by Rutherford. He found the positive cloud of the atom and and named as nucleus. He discovered the positively charged particles protons.
The net charge of an atom is zero because all the positive charges are neutralised by equal number of negatively charged particles electrons.
Therefore, the nucleus is positive and the electron cloud is negative and option 2 is correct.
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