To learn more about the properties of a certain chemical solution, a chemist measures how much light is absorbed by the solution. Light of a single color and intensity is shone through sample solutions, which each have a different concentration of a given chemical. The solutions are placed in test tubes of identical thickness. Why does the chemist use test tubes with identical thickness?

to investigate the effect of the thickness of test tube on the light intensity

When two metals are combined, they form an alloy. The melting point of an alloy varies with the proportion of each metal combined to form the alloy. During an experiment, zinc and copper (the components of the alloy brass) are combined in different proportions by mass. Each of the resulting alloys is then heated until it starts to melt. A device called a thermocouple is used to measure the temperature of the alloy during the heating and melting. What is the dependent variable?

Proportion by mass of metals in alloy

When two metals are combined, they form an alloy. The melting point of an alloy varies with the proportion of each metal combined to form the alloy. During an experiment, zinc and copper (the components of the alloy brass) are combined in different proportions by mass. Each of the resulting alloys is then heated until it starts to melt. A device called a thermocouple is used to measure the temperature of the alloy during the heating and melting. What is the independent variable?

Proportion by mass of metals in alloy

When two metals are combined, they form an alloy. The melting point of an alloy varies with the proportion of each metal combined to form the alloy. During an experiment, zinc and copper (the components of the alloy brass) are combined in different proportions by mass. Each of the resulting alloys is then heated until it starts to melt. A device called a thermocouple is used to measure the temperature of the alloy during the heating and melting. What is the control variable?

Proportion by mass of metals in alloy

Which statement about exothermic reaction is incorrect?

When the reaction takes place in a test tube, the bottom part of the test tube gets warm

Energy is produced from system to surroundings

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MULTIPLE CHOICE QUESTION

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What is the element symbol of sodium?

Answer explanation

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What is the name of O

Oleum

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What is the name of P?

What is the element symbol of helium?

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