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inna [77]
2 years ago
13

Lesson one review:

Chemistry
1 answer:
expeople1 [14]2 years ago
7 0

Mixtures are impure substances composed of two or more substances physically combined.

<h3>What are mixtures?</h3>

Mixtures are substances that are composed of two or more substances physically combined.

Mixtures are one of the different types of substances which are composed of matter.

The classification of matter by type of substance is as follows:

  • Matter - Pure and impure substances or mixtures
  • Pure substances - elements and compounds
  • Mixtures: homogenous and heterogenous

In conclusion, substances can be classified into either pure substances or mixtures.

Learn more about  substances and mixtures at: brainly.com/question/1867365

#SPJ1

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Brandon is traveling in France. He weighs himself at a health club because he is concerned that he has eaten too many croissants
anastassius [24]

<u>Answer:</u>

<u>For a:</u> Yes, he has gained weight.

<u>For b:</u> The number of onions required is 1.

<u>Explanation:</u>

  • <u>For a:</u>

We are given:

Weight of Brandon checked earlier = 183 lb

Converting this into kilograms, we use the conversion factor:

1 kg = 2.205 lb

So, 183lb\times \frac{1kg}{2.205lb}=83kg

And, weight of Brandon measured at the health club = 85.0 kg

As, the weight at the health club is more than the previous measured weight. So, Brandon has gained weight.

  • <u>For b:</u>

We are given:

Amount of diced onions a recipe calls = 125 g

Mass of 1 onion = 4 oz

Converting the mass of 1 onion to ounces, we use the conversion factor:

1 oz = 28.35 g

So, 4oz\times \frac{28.35g}{1oz}=113.4g

To calculate the number of onions, we use the equation:

\text{Number of onions}=\frac{\text{Mass of onion a recipe calls}}{\text{Mass of 1 onion}}

\text{Number of onions}=\frac{125g}{113.4g}=1.1\approx 1

Hence, the number of onions required is 1.

6 0
3 years ago
Question 3
hammer [34]

Answer:

in the excited state

Explanation:

Because in excited state an atom has more energy

5 0
3 years ago
Read 2 more answers
What best describes the goals of scientific investigation and technological development?
bekas [8.4K]
Hi! I think the answer is option B. I hope
this helps, Goodluck :)
5 0
3 years ago
A student makes a mistake while preparing a vitamin C sample for titration and adds the potassium iodide solution twice. How wil
LiRa [457]

The added KI does not have any impact  

The reaction invovles Titration of vitaminc ( Ascorbic acid)

ascorbic acid + I₂ → 2 I⁻  +  dehydroascorbic acid

the excess iodine is free reacts with the starch  indicator, forming the blue-black starch-iodine complex.  

This is the endpoint of the titration. since alreay excess KI is added ( the source of Iodine), it does not have an influence.

Answer B

Hope this helps!

5 0
4 years ago
When an acid is dissolved in water, how does it change the solution's ph?
iren2701 [21]

When an acid is dissolved in water, by releasing protons into the solution, it lowers the pH.

What is pH?

The letters pH stand for the potential of hydrogen since pH is essentially a measurement of the number of hydrogen ions (i.e. protons) in a substance. The pH scale was created in 1923 by scientist Peter Lauritz Srensen. (1868-1969).

The pH of a solution is a key marker of its chemical makeup. The pH can have an impact on the biological processes that take place, the behavior of bacteria, and the behavior of chemicals.

To learn more click the given link.

brainly.com/question/22390063

#SPJ4

5 0
2 years ago
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