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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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Which of the following is not true of acids?
NeTakaya

Answer is: 2. dillute acids feel slipper.

1) Acids are corrosive is correct. For example hydrochloric acid (HCl) will react with most metals.

2) Dillute acids feel slippery is not correct. Bases, for example solution of sodium hydroxide feels slipery.

3) Acids have a distinctly sour taste is correct. For example, vinegar is mixture of acetic acid (CH₃COOH) and water (H₂O). Vinegar is colourless liquid with sour taste and pungent smell, freezing point of the vinegar is lower than glacial acetic acid.

4) Acids have more hydronium ions than hydroxide ions is correct. Because acid gives a lot of hydrogen cations (H⁺), pH (pH = -log[H⁺]) is lower than seven (acidic solution).

5 0
2 years ago
Lithium is a metal,chlorine is a non metal,so LiCl would be a ______bond
ivann1987 [24]
Ionic is the answer. This is because lithium has a positive charge, while chlorine has a negative charge, meaning the compound doesn’t necessarily have an overall charge.
4 0
3 years ago
Homework 1
Bond [772]

Answer:

average for silk =141"

average for cotton =96"

average for nylon = 70"

if you desire a slower falling parachute to protect the body from damage,

silk is the best

if you desire a faster falling parachute to escape enemy bullets,

nylon is the best

Explanation:

Homework 1

Problem Solving

1. Kelvin and Xavier were doing an investigation on parachutes. One of them suggested that the type of material the parachute was made from had an effect on how long it took to reach the ground. Their results are given in

the table below.

(a) Calculate the average time in seconds for each material.

Time taken for parachute to reach the ground (seconds)

MATERIAL

1st TRY

2nd TRY

3rd TRY

AVERAGE

Sik

144

140  average of 3 = 141

139

Cotton

98

96   average of 3  = 96

94

Nylon

72

68    average of 3 = 70

70

5 0
2 years ago
White phosphorus is composed of tetrahedral molecules of P4 in which every P atom is connected to three other P atoms. In the Le
Dmitrij [34]

Answer:

In the Lewis structure of P4 there are 6 bonding pairs and 4 lone pairs of electrons.

Explanation:

The structure of tetrahedral molecule of P4 is provided below.

Each phosphorus atom has 5 valence electrons out of which 3 electrons involve in bonding and the rest 2 electrons exist as a lone pair that does not involve in bonding.Hence each phosphorus atom has one lone pair.In P4 molecule there are phosphorus atoms and hence 4 lone pairs in total.

As you can see in the figure, each phosphorus atom is bonded to the other three atoms.A bond is formed when two atoms share one electron each and the pair is called bonding pair.

From the figure we can see that there are 6 bonds in total.Each bond consist of one bonding pair of electrons and hence in total there are 6 bonding pairs of electrons.

Hence in a P4 molecule there are six bonding pairs and 4 lone pairs of electrons.

4 0
3 years ago
3.95 g of sugar (C6H12O6) is dissolved in water to make 158 mL of solution. Find the molarity.
12345 [234]

Answer:

[C₆H₁₂O₆] = 0.139 M

Explanation:

Molarity si defined as a sort of concentration. It indicates the moles of solute that are contained in 1 L of solution.

We can also say, that molarity are the mmoles of solute contained in 1 mL of solution.

For this case, the solute is sugar (glucose). Let's determine M (mmol/mL)

(3.95 g . 1mol / 180g) . (1000 mmol / 1mol) / 158 mL

We determine moles, we convert them to mmoles, we divide by mL

M = 0.139 M

Moles = 3.95 g . 1mol / 180g → 0.0219 mol

We convert mL to L → 158 mL . 1L/1000mL = 0.158L

M = 0.0219 mol / 0.158L = 0.139 M

8 0
3 years ago
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