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2 years ago

Which of these is an example of a hypothesis? HELP ASAP

Chemistry

2 answers:

alex41 [277]2 years ago

8 0

Answer:

C. Temperature changes may be due to wind patterns.

Explanation:

A hypothesis is an attempt to explain why something happens. The other answer choices are different parts of the scientific method.

"A" is part of the experiment or procedure.

"B" is part of the experiment or procedure.

"D" is a question that may lead to a hypothesis.

Only C offers a potential testable explanation for a phenomenon.

Dovator [93]2 years ago

4 0

Answer:

the answer is C: temperature changes may be due to wind patterns.

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what is the concentration of hydroxide ions after 50.0 ml of 0.250 m naoh is added to 120 ml of 0.200 m na2so4? please show all

Galina-37 [17]

The concentration of the hydroxide ions after 50 ml of 0.250M NaOH is added to 120ml of 0.200M Na2SO4 is 7.35 x 10^-2 M.

What is meant by concentration?

Concentration is the total amount of solute present in the given volume of solution. this is expressed in terms of molarity, molality, mole fraction, normality etc. The term concentration mostly refers to the solvents and solutes present in the solution.

Concentration of hydroxide ions can be calculated by,

M (OH^-) = V (NaOH) x M (NaOH) / V (total) = 50ml x 0.250M / 50ml + 120ml = 0.0735M = 7.35 x 10^-2 M.

where M (OH^-) = concentration of hydroxide ions, V(NaOH) = volume of NaOH, M(NaOH) = concentration of NaOH.

Therefore, the concentration of the hydroxide ions after 50 ml of 0.250M NaOH is added to 120ml of 0.200M Na2SO4 is 7.35 x 10^-2 M.

To learn more about concentration click on the given link brainly.com/question/17206790

#SPJ4

5 0

8 months ago

Which one of the following represents an acceptable set of quantum numbers for an electron in an atom? (arranged as n, 1, m, and

babymother [125]

Answer:

The correct option is A) 3, 2, -2, -1/2.

Explanation:

Quantum numbers represent different properties regarding the level, sublevel and orbital in which an electron is. There are 4 quantum numbers:

Principal quantum number (n): indicates the level of energy and gives information about the size of an orbital. It can only take positive and integer values, e. g., 1, 2, 3...
Angular quantum number (l): indicates the sublevel of energy and provides information about the shape of the orbital. Some common shapes are spherical (l=0) and polar(l=1). Shapes for bigger l are more complicated. l values depend on n values. l values can be integers up to (n-1). For example. if n = 2, l can take the values 0 and 1.
Magnetic quantum number (m): it gives information about the orientation in space of an orbital. It may take any integer value between -l and +l. For example, if l = 1, m can take values -1, 0 and 1, each one referring to an orbital p along a different axis in the space (x, y and z axes).
Spin quantum number (ms): it refers to the spin angular momentum of an electron and it can take 2 values: -1/2 or +1/2.

A) 3, 2, -2, -1/2 is correct because it follows every rule.

B) 3, 3,-4, 1/2 is wrong because if n=3, l can only be up to 2, and l from -3 to +3.

C) 3,2,0,0 is wrong because ms cannot take the value 0.

D) 3,3,3, -1/2 is wrong because if n=3, l can only be up to 2.

E) 3, 4, 6, -1/2 is wrong because if n=3, l can only be up to 2, and l from -3 to +3.

4 0

3 years ago

Iron in rock combining with oxygen to form hematite

blondinia [14]

The answer is a. Chemical change.

4 0

2 years ago

How many Red data lists were compiled for South Africa?

e-lub [12.9K]

Answer:

Don't know if I know itat all

Explanation:

what is red data list

6 0

2 years ago

You wash dishes for a chemistry laboratory to make extra money for laundry. You earn 12 dollars/hour, and each shift lasts 75 mi

nadezda [96]

Answer:

A)You must work 2 shifts to wash 10 loads of laundry

B)You can wash 15 loads pf laundry if you work for 3 shifts

C) each shift will pay for 3.75 loads of laundry if the cost per load rises to 16 quarters

Explanation:

Given:

amount earned = 12 dollars/hour

Duration for one shift = 75 minutes

Amount needed for Laundry = 12 quarters/load.

A. How many shifts must you work if you wish to wash 10 loads of laundry

To wash 10 loads, you will be requiring

=> $10 \times 12 \text{quarters}$

=> 120 quarters

1 quarter = 0.25 dollars---------------------------------(1)

120 quarters

= $120 \times 0.25 \text{ dollars}$

= 30 dollars

You need 30 dollars for washing 10 loads

In one hour i,e 60 minutes you earn= 12 dollars

In one minute the amount earned will be

$= \frac {12}{60}$

= 0.2 dollar-------------------------------------------------------(2)

Now to earn 30 dollars you have to work for

= $30 \times 0.2$ minutes

= 150 minutes

Thus the number of shifts will be

= $\frac{150}{75}$

= 2 shifts

B. How many loads of laundry can you wash if you work 3 shifts

We Know that 1 shift = 75 minutes

So 3 shifts = $75 \times 3$ = 225 minutes

From (2),

In 1 minute = 0.2 dollars is earned

So in 225 minutes = 225 \ times 0.2 = 45 dollar is earned

45 dollar = $45 \times 4$ = 180 quarters

You can wash 1 load with 12 quarters

With 180 quarters you can wash = $\frac{180}{12}$ = 15 loads

C. How many loads of laundry will each shift pay for if the cost per load rises to 16 quarters

Cost per load = 16 quarters

From (1)

16 quarters = $0.25 \times 16$ = 4 dollars per load

From (2) In 1 shift the amount earned will be

=> $75 \times 0.2$

=15 dollars

With 4 dollars you can wash 1 load

So with 15 dollars = $\frac{15}{4}$ = 3.75 loads

4 0

2 years ago