B. Chocolate
C. Lactase
D. Orange juice
The concentration of the solution has been 0.17 M.
The molarity has been defined as the moles of solute that has been dissolved in a liter of solution. The molarity of the solution has been expressed as:
The molar mass of sodium chloride solution has been 58.5 g/mol.
The given mass of NaCl in the solution has been 0.5 grams.
The volume of NaCl solution has been 0.05 L.
Substituting the values for molarity of the solution:
The concentration of the solution has been 0.17 M. The solution has been prepared by dissolving 0.5 g NaCl in minimal water, and makeup the volume to 0.05 L.
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(2) The proportion by mass of elements combined in potassium chlorate varies.
(3) Potassium chlorate is composed of four elements.
(4) Potassium chlorate is composed of five elements.
Answer : The correct option is, (1) The proportion by mass of elements combined in potassium chlorate is fixed.
Explanation :
The composition of any compound is studied on the basis of law of fixed proportion. This law stats that in a compound the elements are present in fixed proportion by their mass.
In the given options, the option (1) statement describes the composition of potassium chlorate.
While the other options (2), (3) and (4) statements does not describe the composition of potassium chlorate.
Hence, the correct option is (1).
b. They contain younger stars and more gas and dust.
c. They are bigger than spiral galaxies.
d. They are smaller than spiral galaxies.
Answer:
A. They contain older stars and less gas and dust.
Explanation:
There are three types of galaxies:
Elliptical galaxies are galaxies shaped like an ellipse, while spiral galaxies consist of a flat, rotating disk that contains stars, gas, and dust, and a central concentration of stars called the bulge.
The difference between elliptical and spiral galaxies is in the amount of gas and dust they contain. Spiral galaxies contain large amounts of gas and dust, which means that new stars are born very often. This makes them brighter than relatively dim elliptical galaxies, which contain less gas and dust. This is why fewer new and brighter stars are born in elliptical galaxies, leaving them with older, dimmer stars.
Skeleton equation →
Balanced equation →
A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.
Skeleton equation -A skeletal chemical equation is a representation of a chemical reaction using chemical formulae of reactants and products.
Skeleton equation →
Balanced equation-A balanced chemical equation tells you the amounts of reactants and products needed to satisfy the Law of Conservation of Mass.
Balanced equation →
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