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Savatey [412]
3 years ago
12

Which statements about scientific explanations are true? I. Scientific explanations must prove that a hypothesis is true. II. Sc

ientific explanations should be based on evidence or data. III. Scientific explanations must have logical and consistent arguments. IV. Scientific explanations should use scientific principles, models, and theories. A. I, II, III and IV B. I, II and III only C. II, III and IV only D. II and III only
Chemistry
1 answer:
harina [27]3 years ago
7 0

Answer: A

Explanation:

Because we make hypothesis to find an answer to our observation or question. So if the Hypothesis is correct then the then a scientific explanation proves that a hypothesis is true. We also need more data and evidence to explain a scientific theory or question. A scientific expirement should be tested by many scientists to see if the results are correct. The more scientists aprove and the more evidence we have, the more correct our expirement is.

((hope this helped!)

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_____ stars can be between one thousand times dimmer and one million times brighter than the Sun.
dmitriy555 [2]

Answer:

The answer is

D. Main sequence

Explanation:

Main sequence stars can be between one thousand times dimmer and one million times brighter than the Sun.

What is main sequence stars?

A main sequence star is any star that is fusing hydrogen in its core and has a stable balance of outward pressure from core nuclear fusion and gravitational forces pushing inward.

6 0
3 years ago
Rank the metals from most reactive (1) to least reactive (3) silver, strontium, and technetium
Natasha2012 [34]

Answer:

1 = strontium

2 = technetium

3 = silver

Explanation:

Strontium is present in 2 group of periodic table. It is alkaline earth metal. It is most reactive element and can not found free in nature. it  is insoluble in water but react with water and form strontium hydroxide and hydrogen gas is also produced. It is radioactive element.

It is similar to the calcium and can incorporated into bones. The food rich with strontium is used to avoid the osteoporosis. It is found in leafy vegetables, grains, sea foods etc.

In given series strontium is highest in reactivity then technetium, while the technetium is more reactive than silver. The silver is less reactive as compared to both given elements.

7 0
3 years ago
Read 2 more answers
What is the length of the hypotenuse of the right triangle ABC in the figure?
Lostsunrise [7]
Triangle ADC is also a right triangle, with D the right angle, and AC the hypotenuse. 
The triangles are similar (right triangles which share an angle (A), so... 
AD/AC = AC/AB 5/6 = 6/AB AB = 6*6/5 = 36/5 = 7.2
8 0
3 years ago
Read 2 more answers
Explain how to separate sugar from supersaturated sugar solution<br> guys pls help
brilliants [131]

A “supersaturated” solution contains more dissolved material. supersaturated solutions lies in the temperature of the water. more sugar will dissolve in hot water than in cold. Meaning that by separating the 2, only the supersaturated sugar would dissolve leaving the regular sugar untouched.

5 0
3 years ago
An element, X, can form a chloride (XCl3) and an iodide (XI3). The chloride can be converted quantitatively into the iodide when
Arlecino [84]

Answer : The chemical symbol for this element is, (La)

Explanation : Given,

Mass of XCl_3 = 0.760 g

Mass of XI_3 = 1.610 g

The given chemical reaction is:

2XCl_3+3I_2\rightarrow 2XI_3+3Cl_2

First we have to calculate the moles of XCl_3 and XI_3.

\text{Moles of }XCl_3=\frac{\text{Mass of }XCl_3}{\text{Molar mass of }XCl_3}

Molar mass of Cl = 35.5 g/mole

Let the molar mass of element 'X' be, M

\text{Moles of }XCl_3=\frac{0.760}{[M+3(35.5)]}

and,

\text{Moles of }XI_3=\frac{\text{Mass of }XI_3}{\text{Molar mass of }XI_3}

Molar mass of I = 126.9 g/mole

Let the molar mass of element 'X' be, M

\text{Moles of }XI_3=\frac{1.610}{[M+3(126.9)]}

From the balanced chemical reaction we conclude that,

The moles of ratio of XCl_3 and XI_3 is, 1 : 1

That means,

\frac{0.760}{[M+3(35.5)]}=\frac{1.610}{[M+3(126.9)]}

\frac{0.760}{[M+106.5]}=\frac{1.610}{[M+380.7]}

M=138.667g/mol

From this we conclude that the element (X) is lanthanum (La) that has molecular weight, 138.667 g/mol.

Hence, the chemical symbol for this element is, (La)

6 0
4 years ago
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