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Aleksandr-060686 [28]
3 years ago
7

Lucia wants to develop a process for dyeing shirts so that the color will not fade when the shirt is washed. She proceeds with t

he following activities:
1. Lucia notices that the dye in a design fades when the shirt is washed.
2. Lucia decides that the dye needs something to help it combine with the fabric.
3. She places a spot of dye on each of four shirts and then places each one separately in water, salt water, vinegar, and baking soda and water.
4. After one hour, all the shirts are removed and washed with a detergent.
5. Lucia notices that the dye has faded on the shirts in water, salt water, and baking soda, while the dye did not fade on the shirt soaked in vinegar
6. Lucia thinks that the vinegar binds with the dye so it does not fade when the shirt is washed.
Part A
Identify each of the statements as an observation, a hypothesis, an experiment, or a theory.
Drag the appropriate items to their respective bins.

Observation
Hypothesis
Experiment
Theory​
Chemistry
2 answers:
Elza [17]3 years ago
7 0

Answer:

1. This is an observation

2. This is her Hypothesis

3. This is part of her Experiment

4. This is part of her Experiment

5. This is an observation.

6. This is her Theory

Explanation:

To solve this problem you have to understand the differences and relationships between the concepts of observation, hypothesis, experiment and theory.

An observation is something that you see is ocurring in nature or in any system. Also, it describes things that you see as results of an experiment. For example Lucia saw that the dye in a design fades when the shirt was washed and that this not happened when the shirt was soaked in vinegar.

A hypothesis is a paragraph that suggest why the process that you described in your observation is happening. For example Lucía thought that the dye needs something to help it combines with the fabric. This hypothesis needs to be verified.

An experiment is a procedement that you employ to test your hypothesis, to verify it. For example the assay developed by Lucía in which shirts were subjected to different liquids.

Finally a Theory, is a complete explanation of the observation and hypothesis suggested and evaluated trough experimentation. Is the result or conclusion after ejecution of all previous steps. For example, Lucía hinks that the vinegar binds with the dye so it does not fade when the shirt is washed

Firlakuza [10]3 years ago
3 0
I cant because it not full
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NEED QUICK ANSWERS ( science)
nata0808 [166]

Answer:

Explanation:

"Nature does this job through a process called the water cycle. Also known as hydrologic cycle, the water cycle is a phenomenon where water moves through the three phases (gas, liquid and solid) over the four spheres (atmosphere, lithosphere, hydrosphere and biosphere) and completes a full cycle. The water cycle has many effects: it regulates the temperature of the surroundings. It changes weather and creates rain. It helps in conversion of rocks to soil. It circulates important minerals through the spheres. It also creates the many geographical features present on earth like the ice caps of mountains, icebergs, the rivers and the valleys, lakes, and more. Hence it is quite important to understand and learn the processes of the water cycle."

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6 0
2 years ago
Solid sodium azide (NaN3) produces solid sodium and nitrogen gas. How many grams of sodium azide are needed to yield a volume of
ch4aika [34]

Answer:

52.008 grams of sodium azide are needed to yield a volume of 26.5 L of nitrogen gas at a temperature of 295 K and a pressure of 1.10 atmospheres.

Explanation:

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P*V = n*R*T

In this case, the balanced reaction is:

2 NaN₃ → 2 Na + 3 N₂

You know the following about N₂:

  • P= 1.10 atm
  • V= 26.5 L
  • n=?
  • R=0.082057 \frac{atm*L}{mol*K}
  • T= 295 K

Replacing in the equation for ideal gas:

1.10 atm* 26.5 L= n* 0.082057 \frac{atm*L}{mol*K}*295 K

Solving:

n=\frac{1.10 atm*26.5 L}{0.082057 \frac{atm*L}{mol*K} *295K}

n= 1.2 moles

Now, the following rule of three can be applied: if 3 moles of N₂ are produced by stoichiometry of the reaction from 2 moles of NaN₃, 1.2 moles of N₂ are produced from how many moles of NaN₃?

moles of NaN_{3}=\frac{1.2 molesofN_{2} *2 molesofNaN_{3} }{3 molesofN_{2} }

moles of NaN₃= 0.8

Since the molar mass of sodium azide is 65.01 g / mol, then one last rule of three applies: if 1 mol has 65.01 grams of NaN₃, 0.8 mol how much mass does it have?

mass of NaN_{3} =\frac{0.8 mol*65.01 grams}{1 mol}

mass of NaN₃=52.008 grams

<u><em>52.008 grams of sodium azide are needed to yield a volume of 26.5 L of nitrogen gas at a temperature of 295 K and a pressure of 1.10 atmospheres.</em></u>

6 0
3 years ago
Read 2 more answers
How many moles of electrons are transferred when 2.0 moles of aluminum metal react with excess copper(II) nitrate in aqueous sol
mojhsa [17]

Moles of electrons:

The moles of electrons that are transferred are 12F

A balanced equation:

2 moles of Aluminium metal react with excess copper(II) nitrate.

2Al + 3Cu{(NO_3)}_2  \rightarrow 2Al{(NO_3)}_3 +3 Cu

Given:

Moles of Aluminium = 2

As Aluminium goes from 0 to +3 oxidation state

Al \rightarrow Al^{3+} + 3e^-

And copper goes from +2 to 0

Cu^{2+} + 2e^-\rightarrow Cu

On balancing the number of electrons we get:

For 1 mole of Al 6e^- is required.

Therefore for 2 moles of Al,

Total (2\times6)F mole of electrons

Where F= Faraday's constant= 96500 C

So, 12F moles of electrons are transferred.

Learn more about Faraday's Law here,

brainly.com/question/27985929

#SPJ4

4 0
1 year ago
I need you to solve for me plzzzzzz
Sergeu [11.5K]

Answer:

.0556 L

Explanation:

First, convert the 1.35 M to 1.35 mol/L in order for the units to correctly cancel out.

Then, multiply (0.0725 moles Na2CO3/1) times (L/ 1.35 mol).

Finally, the answer will be .0556 L.

<h3 />
3 0
2 years ago
Which compound contains a double bond?
just olya [345]
The answer would be ethane (C2H4)
7 0
3 years ago
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