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3 years ago

Why would a scientist only use observations to formulate a theory rather than follow the scientific method?

1 answer:

7 0

Answer: Observation is essential in science. Scientists use observation to collect and record data, which enables them to construct and then test theories

Explanation:

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What is the pH of a 1 ´ 10-5 M KOH solution?

melisa1 [442]

KOH -------------> K⁺ + OH⁻

pOH = - log [ OH⁻ ]

pOH = - log [ 1 x 10⁻⁵ ]

pOH = 5

pH + pOH = 14

pH + 5 = 14

pH = 14 - 5

pH = 9

hope this helps!

3 0

3 years ago

What do you call the ability of a gas to completely spread out and mix with other substances?

julsineya [31]

The ability for gas to mix with other or multiple substances is diffusion

8 0

3 years ago

Read 2 more answers

Convert the average temperatures for each collected data point given below from °C to K. Plot the average cell potentials E (y-a

koban [17]

Answer:

Explanation:

The equation of above line , y = 0.0005x+ 0.458

This can be compared with y = mx+c

Hence slope, m = 0.0005 and Y-intercept, c = 0.458

Or it can be plotted manually where straight line has to be drawn touching maximum number of data points. After drawing a straight linear line, we need to take any two points from the straight line and slope is calculated

Slope,

$m = \frac{y_2-y_1}{x_2-x_1}$

and y -intercept is calculated using extraplotting backwards such that it touches the Y-axis. the point where straight line touches Y-axis is Y-intercept (c).

Plot the average cell potentials E (y-axis) vs T (x-axis). image attached

7 0

3 years ago

For the reaction 3ZnCO3 + 2H3PO4 —> 3H2O + 3CO2, how many miles of zinc carbonate are required to produce 3.0 mil of Zn3(PO4)

drek231 [11]

Answer:

$\boxed{ \text{9.0 mol of ZnCO$_{3}$}}$

Explanation:

(a) Balanced equation

3ZnCO₃ + 2H₃PO₄ ⟶ Zn₃(PO₄)₂ + 3H₂O + 3CO₂

(b). Calculation

You want to convert moles of Zn₃(PO₄)₂ to moles of ZnCO₃

The molar ratio is 1 mol Zn₃(PO₄)₂:3 mol ZnCO₃

$\text{Moles of ZnCO$_{3}$} =\text{3.0 mol Zn$_{3}$(PO$_{4})_{2}$ } \times \dfrac{\text{3.0 mol ZnCO$_{3}$}}{\text{1 mol Zn$_{3}$(PO$_{4}$)$_{2}$}} \\\\\\= \text{9.0 mol ZnCO$_{3}$}$

You need $\boxed{ \textbf{9.0 mol of ZnCO$_{3}$}}$ to form 3.0 mol of Zn₃(PO₄)₂.

4 0

3 years ago

What element is the 10th largest element? (Of the periodic table)

snow_tiger [21]

Hope this really truly helps

3 0

3 years ago