Science

Carole and Eli were learning about solutions in science class. In this picture, you can see a model of a solution the students made. The black circles represent the solute. The dashed lines are the solvent. How can the students INCREASE the concentration of this solution?

add more solute. add more solvent heat the solvent stir the solution

The concentration of a solution can be increased by

adding more solute. adding more solvent filtering the solution it is impossible to change the concentration of a solution

Jake wants to quickly dissolve Gatorade in a pitcher. What would help Jake INCREASE the rate at which his Gatorade dissolves?

adding sugar cooling the mixture adding more Gatorade stirring the mixture.

Grace is given a piece of wood, an iron nail, and a styrofoam cup. She puts these objects into a bucket of water and observes that the nail sinks to the bottom, the wood floats just under the surface, and the cup floats on top of the water. What property is being demonstrated by this experiment? There are two.

density solubility mass reflectivity

In which mixture would be best choice for separating the mixture using a magnet?

gravel and rocks sand and gravel sand and iron filings. sand and salt sand and wood shavings sugar water

A tablespoon of a substance is added to warm water and stirred. The result was that the substance could no longer be seen. We can conclude from the results that the substance -

is less dense than water heated the water flavored the water dissolved in the water.

On a hot day, your friend brings you some iced tea to cool off. Only, its unsweetened. You add sugar, but it just does not dissolve fast enough. Which procedure would speed up the dissolving process?

Add the sugar in the dark Add larger crystals of sugar, or sugar cubes Take the tea up to the top of a close mountain Take out the ice and stir it up outside where it is warmer.

Which of the following describes using a physical change to separate a mixture?

Heating water to be able to dissolve more sugar in it Adding vinegar to baking soda to produce bubbles from a gas Melting a chocolate bar with almonds to remove the almonds. Burning wood to produce thermal energy to cook food

Sugar cubes are being dissolved in a beaker of water. Which of the following changes would help the sugar dissolve faster? Choose all that apply.

Using smaller sugar cubes Stirring the mixture Heating the water Replacing the beaker

A beaker contains a substance that takes up approximately half the volume of the beaker but does not touch all sides of the beaker. The substance must be a

solid. liquid gas

Carole and Eli were helping their Mom make some iced tea. They put three tea bags into a pitcher with one liter of hot water. Next they poured in 1 cup of sugar and stirred the mixture. Their sister, Margo, came in and tasted the tea. "Oh my! That is too sweet!" What can the children do to REDUCE the concentration of sugar in the tea?

stir the solution more pour out some of the water add more water to the pitcher. add more sugar to the pitcher

Josh is experimenting to try and find how to speed up the dissolving of a solid in water. Which will not increase the rate of dissolving?

stirring the solution increasing the temperature using small solute particles using large solute particles.

Think about the substances of each solution. Which substance is insoluble?

sugar in water drink powder mix in water oil in water. salt in water

Think about the substances of each mixture. Which substance is soluble in its mixture?

sugar in water. sand in water oil in water pebbles in sand

Josh decided his glass of iced tea needed to be sweeter. He found two types of sugar he could use in the kitchen. There was a bowl of loose crystals of sugar and a bowl of sugar cubes. Which one will dissolve faster in the iced tea?

the sugar cubes the loose sugar crystals. sugar will not dissolve in iced tea it will not matter which sugar he uses