Answer:
(4) Water, stirring, and filtering
Explanation:
The added water will dissolve the sugar but not the sand. When you filter the mixture, the sand will be trapped in the filter paper and the dissolved sugar will pass through the pores of the paper.
(1) and (2) are wrong. You don't separate a mixture of sugar and sand by adding more sand. Furthermore, neither substance will boil at 100 °C.
(3) is wrong. You can dissolve the sugar in water but, if you boil the water away, the sugar and sand will still be together.
Answer:
These spheres are closely connected. For example, many birds (biosphere) fly through the air (atmosphere), while water (hydrosphere) often flows through the soil (lithosphere). ... Interactions also occur among the spheres; for example, a change in the atmosphere can cause a change in the hydrosphere, and vice versa.
<h2>
Please mark me as brainliest if any one else answers by clicking on the crown at the bottom of my answer</h2>
55.36 is the mass of Calcium Bromide is needed to make 0.500 L of 0.554 M solution.
Explanation:
Data given:
mass of Ca = ?
molarity of the calcium bromide solution = 0.554 M
Volume of the calcium bromide solution= 0.5 L
First the moles of calcium bromide is calculated as:
molarity =
number of moles = 0.554 x 0.5
number of moles = 0.277 moles of calcium bromide
atomic mass of calcium bromide = 199.89 grams/mole
mass = atomic mass x number of moles
mass of calcium bromide = 199.89 x 0.277
= 55.36 grams
mass of calcium bromide required is 55.36 grams to make solution of 0.554 M in a solution of 0.5 litres.
Answer:
Calcium hydroxide.
Explanation:
The gastric juice is a solution of hydrochloric acid. It is highly acidic. Antacids contain basic chemicals that could neutralize that acid.
If the active ingredient in an antacid medication is a metal hydroxides ("alkalis,") it is likely to be calcium hydroxide . Compared with other metal hydroxides, is superior in multiple ways.
<h3>Calcium hydroxide is less soluble and is a relative mild metal hydroxide</h3>
and rapidly dissolve in water to produce a strongly basic solution. In contrast, the solubility of calcium hydroxide in pure water is relatively low. That means that there's a lower chance for antacids based on calcium hydroxide to irritate the mouth and throat while being swallowed.
<h3>
Calcium hydroxide is generally non-toxic</h3>
Hydroxides of toxic "heavy" transition metals, such as copper (II) hydroxide, are even weaker than calcium hydroxide. However, when these alkalis react with the HCl in gastric juice, they release their toxic metal cations. As a result, these alkali are seldom used in antacids. In contrast, calcium occurs naturally in many dairy products and is not as toxic.
Magnesium hydroxide is weaker than calcium hydroxide and is also not toxic. However, since the magnesium ion is a potential laxative, it is not as frequently used as calcium hydroxide in antacids.