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3 years ago

List four examples of diffusion seen in daily life.

Chemistry

1 answer:

babunello [35]3 years ago

6 0

Answer:

Spraying perfume in one corner of the room and the smell travels to the other side of the room

Explanation:

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What is the name of this hydrocarbon?

grandymaker [24]

It's Butane (C4H10)

it's an alkane (CnH2n+2)

good luck

6 0

3 years ago

Read 2 more answers

6. Alex wanted to find out what toothpaste made teeth the cleanest. Everyday she brushed her

vichka [17]

Answer:

a) Independent variable (IV): toothpase brand

b) Dependent variable (DV): amount of plaque left

c) Control: water

d) Constants: amount of toothpaste, kind of toothbrush, how long the toothbrushing took.

Explanation:

In an experiment there usually be independent variable, dependent variable, control gropus, and constants.

The independendent variable is the variable whose impacts on other varbiale. Then, the independent variable is manipulated or changed by the scientist (the person that designs or perform the experiment).

In this case, Alex is changing the brand of toothpaste: Crest, Colgate, and Close-Up. So the answer to the first question is brand of toothpaste:

a. Independent variable (IV): toothpaste brand.

The dependent variable is the variable that changes by the effect of changing the independent variable. It is the variable whose behavior you want to explain in terms of the independent variable.

In this case, Alex wants to determine the effect of the toothtpaste brand on the plaque, so the dependent variable is how much plaque is left.

b. Dependent variable (DV): how much plaque is left.

The control is a group of experiments used for comparison. This is, you do not include the independent variable in them. In this example it is the set of experiments made with only water. The scientist will be able to compare the results of using toothpase with no using toothpaste on the plaque when he includes a group of experiments where no toothpaste is used but water.

c. Control: water

In order to state if it is the change in the independent variable what causes or explains the results on the dependent variable, the scientist must make sure that no other changes occur during the experimentation.

In this case, it is not stated which other conditions Alex made sure to remain constant, but for sure they should include the amount of toothpaste used, the kind of teethbrush, and the time of brushing.

d. Constants: presumably, the amount of toothpase, the kind of toothbrush, and the time of brushing.

3 0

3 years ago

there are two waves. Wave A has a high frequency compared to wave B. which wave will have a longer wavelength? which one will ha

hoa [83]

A will have the higher energy. B will have the longer wavelength

8 0

3 years ago

In the third century B.C., King Hieron of Syracuse asked the famous mathematician Archimedes to determine if his crown was made

Llana [10]

Answer:

See explanation

Explanation:

a. I can conclusively tell if the crown was made of gold by measuring its density. First the mass of the crown is measured on a weighing balance. The crown is now put into a given volume of water and the volume of water displaced is accurately measured. The density of the crown is computed as mass/volume of fluid displaced. If the density of the crown is 19.3 g/mL, then it is made of solid gold.

b) When less valuable metals such as bronze or copper is mixed with gold in the crown, the density of the crown decreases and the crown becomes more brittle.

c) An object will float in a liquid when the density of the object is less than the density of the liquid. Hence the tendency of an object to float in a liquid depends on the density of the object and the density of the liquid.

d) Even though i do not know the results from your experiment but as regards the decision as to whether the object will float in the given liquid or not, reference must be made to the measured density of the object as well as the given density of the liquid. If the object is less dense (from values of density obtained from the experiment) than the liquid, then the object will float in the liquid and vice versa.

5 0

3 years ago

Ethanol has a density of 0.791 g/mL. A student pipets enough volume in mL to obtain 120.0 g.

Elza [17]

Answer:

I can't answer that Po sorry

5 0

2 years ago