2. The mass of magnesium hydroxide, Mg(OH)2, in an indigestion tablet was determined as follows: Step 1 The tablet was crushed and dissolved in exactly 40.00 cm of 0.5M Hydrochloric acid (an excess). Mg(OH)2(s) + 2HCl(aq) → MgCl2(aq) + 2H2O(1) Step 2 The amount of hydrochloric acid remaining was measured by titration with 0.250 mol dm ’ sodium hydroxide solution. 22.80 cm of this sodium hydroxide solution was required. Calculate the mass of magnesium hydroxide in the tablet.​

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The diagrams show objects’ gravitational pull toward each other. which statement describes the relationship between diagram x and y? gravity attracts only larger objects toward one another. gravity attracts larger objects only if they are close to one another. if the masses of the objects increase, then the force between them also increases. if distance between the objects increases, then the amount of force also increases.

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.