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nikitadnepr [17]
3 years ago
9

Astronomers have observed that the universe is expanding and is accelerating in all directions. Using this evidence, astronomers

have hypothesized that a huge explosion called the big bang created the universe. Which of the following correctly describes the big bang?
Fact


Theory


Opinion


None of these
A scientific theory is a well-tested explanation for a wide range of observations or experimental results. A hypothesis is a possible answer to a question. When does a hypothesis become a scientific theory?


after the hypothesis is first formed by a scientist


after a hypothesis is shown to correct in one experiment


after the hypothesis has been confirmed through extensive testing


after a competing hypothesis has failed

Nicolas has completed the experimental portion of the lab. Which of these should he do while he works on the analysis questions?


talk to his friends who are still collecting data


keep his safety goggles on


keep his gloves on


work on another experiment he thought of

How do the independent and dependent variables in an experiment compare?


They are the exact same as one another.


They have no effect on one another.


The dependent variable controls the independent variable.


The independent variable controls the dependent variable.

I NEED HELP !!!! ASAP 

please help
Chemistry
1 answer:
andrew-mc [135]3 years ago
3 0

Dependant Variable is your answer :D

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A gas occupies 200ml at a temperature of 26 degrees Celsius and 76mmHg pressure. Find the volume at -3degree Celsius with the pr
sergey [27]

Answer:

184.62 ml

Explanation:

Let p_1, v_1, and T_1 be the initial and p_2, v_2, and T_2 be the final pressure, volume, and temperature of the gas respectively.

Given that the pressure remains constant, so

p_1=p_2 ...(i)

v_1 = 200 ml

T_1= 26 ^{\circ}C = 273+26 =299 K

T_2= 3 ^{\circ}C = 273+3 =276 K

From the ideal gas equation, pv=mRT

Where p is the pressure, v is the volume, T is the temperature in Kelvin, m is the mass of air in kg, R is the specific gas constant.

For the initial condition,

p_1v_1=mRT_1 \\\\mR= \frac{p_1v_1}{T_1}\cdots(ii)

For the final condition,

p_2v_2=mRT_2 \\\\mR= \frac{p_2v_2}{T_2}\cdots(iii)

Equating equation (i), and (ii)

\frac{p_1v_1}{T_1}=\frac{p_2v_2}{T_2}

\frac{v_1}{T_1}=\frac{v_2}{T_2}  [from equation (i)]

v_2=\frac{T_2}{T_1} \times v_1

Putting all the given values, we have

v_2=\frac{276}{299} \times 200 = 184.62 \; ml

Hence, the volume of the gas at 3 degrees Celsius is 184.62 ml.

7 0
2 years ago
3) In the Hydrolysis of Disaccharides and Polysaccharides portion of the lab, starch should give one positive iodine test and on
AfilCa [17]

Answer: potassium iodide is the basic test for starch,and the positive test is blue-black coloration, any other test substance which is not starch will give a negative results.

Explanation:

Starch is an example of  polysaccharide  and since the standard test for it is potassium iodide solution, it gives a positive test.

Diasaccharides e.g maltose are reducing sugars.their standard test is BENEDICT test .

Therefore, in the hydrolysis;  starch should give a positve test, while Diasaccharides should give negative rest.

3 0
3 years ago
What is the unit of temperature on a solubility graph
Andrej [43]

Answer:

Khfxgkhxxkfhkugxxiufxhfixiyf

Explanation:

Xlufy8fxtukuxfxtu

6 0
2 years ago
Read 2 more answers
1 How many moles of solute are in:
Sonbull [250]

Moles of solute for both a and b are the same = 1 mol

<h3>Further explanation</h3>

Given

a 500 cm³ of solution, of concentration 2 mol/dm³

b 2 litres of solution, of concentration 0.5 mol/dm³

Required

moles of solute

Solution

Molarity shows the number of moles of solute in every 1 liter of solution or mmol in each ml of solution

Can be formulated :

\large \boxed {\bold {M ~ = ~ \dfrac {n} {V}}}

a.

V = 500 cm³ = 0.5 L

M = 2 mol/L

n=moles = M x V

n = 2 mol/L x 0.5 L

n = 1 mol

b.  

V = 2 L

M = 0.5 mol/L

n=moles = M x V

n = 0.5 mol/L x 2 L

n = 1 mol

5 0
3 years ago
What do you mix with sanitizer to make it stronger?
Nat2105 [25]
Colloidal silver/ionic silver adds antibacterial power
6 0
3 years ago
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