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4 years ago

1, This element has a complete outermost energy level and is found in the 5th period.

1 answer:

6 0

1) Xenon
2) Berylium
3) Aluminium (Assuming 3p = 3rd Period)
4) Tungsten
5) Bromine
6) Xenon again
7) Indium I think
8) Strontium
9) Titanium
10) Oxygen
11) I don't understand that at all XD
12) Rutherfordium
13) Radon
14) Potassium?
15) Argon

So somebody needs to confirm 3, 7, 11, and 14, but I think the rest are correct if you load up a Periodic table

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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

What are the factors that affect the rate of dissolution?

Liula [17]

Option (C) is the correct answer.

When solute is added to the solvent, results in the formation of solution and the process is said to be dissolution.

Dissolution process depends upon the three factors: temperature, stirring and surface area.

Stirring increases the rate of dissolving as when stirring a solute in the solvent, stirring helps in the distribution of solute throughout the solvent which results in speed up the dissolving rate.

Dissolution also depends upon the temperature, in warm solvent, solute dissolves readily whereas in cool solvent, solute dissolves slowly as particles have more movement energy.

Greater the surface area, there will be more contact between the solute particles and solvent particles which increases the rate of dissolving. Smaller the surface are, there will be less contact between the particles which decreases the rate of dissolving. For example: granulated sugar dissolves more readily due to larger surface area and one ice cube dissolves slowly due to smaller surface area.

Hence, rate of dissolution depends upon temperature, stirring, surface area.

4 0

3 years ago

2. Which is an abiotic factor?

Anna11 [10]

Yes I would say it is A

5 0

3 years ago

Read 2 more answers

We love blasting our radio in the morning to wake up. Radio waves are used to transmit information on various channels. Calculat

Reil [10]

Answer:

wavelength = 0.56 × 10⁻² m

Explanation:

Given data:

Frequency of radiation = 5.4 × 10¹⁰ Hz

Wavelength = ?

Solution:

Formula:

speed of light = wavelength × frequency

wavelength = speed of light / frequency

wavelength = 3 × 10⁸ m/s / 5.4 × 10¹⁰ Hz ( Hz= 1/s)

wavelength = 0.56 × 10⁻² m

4 0

4 years ago

Answer this ......,..,.,.,.,.,.,.,..,.,.,.,.,.z.z.,.,.,.,..,.,.,.,.,.,.,.,.,..,

ioda

A) CuBr2

b) Al(NO3)3

c) Ca3(PO4)2

d) Fe2S3

e) HgCl2

f) Mg(C2H3O2)2

7 0

3 years ago