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4 years ago

When milk turns sour it is a

Chemistry

2 answers:

Andrew [12]4 years ago

8 0

It is a chemical change.

Hope this helps !

Photon

Natalka [10]4 years ago

6 0

It is a chemical change. When milk turns sour for example in a warm room it is a chemical change. If it was a physical change you would be able to undo the souring of milk. Since you can't, it is not a physical change.
~Deceptiøn

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Calculate the work done when a force of 4 N pulls a box along the floor for a distance of 0.3 m.

Yuki888 [10]

Answer:

<h2>1.2 Joule</h2>

solution,

Force=4 N

Distance=0.3 m

Now,

 $work = f \times d \\ \: \: \: \: \: \: \: \: \: \: \: = 4 \times 0.3 \\ \: \: \: \: \: \: \: \: \: \: \: = 1.2 \: joule$ 

hope this helps...

Good luck on your assignment....

8 0

4 years ago

Calculate the percent error, with correct sig figs, in the atomic weight if the mass of a Zn electrode increased by 0.3681 g and

Reptile [31]

Answer:

the percent error is -13.5%

Explanation:

Given the data in the question;

Exact atomic weight = 65.38 g/mol

For approx

increased mass = 0.3681 g

moles = 6.514 x 10⁻³

we know that; moles = mass / (Atomic mass )

Atomic mass_ $_{approx$ = mass / moles

Atomic mass_ $_{approx$ = 0.3681 / 6.514 x 10⁻³

Atomic mass_ $_{approx$ = 56.509

so approx atomic weight = 56.51 g/mol

we know that;

% error = ( [approx - exact] / exact ) × 100

we substitute

% error = ( [56.51 - 65.38] / 65.38 ) × 100

% error = (-8.87 / 65.38 ) × 100

% error = ( -0.1356684 ) × 100

% error = -13.5%

Therefore, the percent error is -13.5%

3 0

3 years ago

Which statement describes the relationship between microscopic and macroscopic phenomena?

sesenic [268]

Answer:

It's d

Explanation:

They have two different meaning and jobs

8 0

3 years ago

List any five items that can be found in a Science portfolio

ad-work [718]

Answer:

physical projects

Journal entries

Materials

Lab reports

Artworks

Explanation:

Definition of a Portfolio:

Portfolio can be defined as a physical collection of student work that includes materials such as written assignments, completed tests, artwork, lab reports, physical projects and other material evidence of learning progress and academic accomplishment, including awards and honors,

A portfolio is a long-term form of self reflection and assessment that students do together.

Portfolios are a great way to demonstrate the competencies you would list on a resume or talk about in a science interview

6 0

3 years ago

What is my percent yield if I calculated that a reaction would yield 20.0 g of iron (II) chloride, but I only managed to get 4.0

sergiy2304 [10]

Answer:

Theoretical yield is 20%.

Explanation:

Percent yield = [(actual yield)/(theoretical yield)] $\times 100$ %

Theoretical yield is calculated amount of product by using stoichiometric ratio between reactant and product.

Actual yield is the amount of product which is experimentally obtained.

Here theoretical yield is 20.0 g and actual yield is 4.0 g.

So, percent yield = $\frac{4.0g}{20.0}\times 100$ % = 20%

6 0

4 years ago