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3 years ago

Ca + 2H2O → Ca(OH)2 + H2

Physics

2 answers:

Vesnalui [34]3 years ago

6 0

The answer is B) 2]

Hope this helps

Lisa [10]3 years ago

3 0

Thew coefficient for sodium in a similar reaction is 2 (answer B)

Explanation

write a balanced chemical equation between sodium and water.

2 Na+ 2 H2O→ 2NaOH +H2

coefficient is the number in front of a chemical formula. it tell how many molecules or atoms of a given formula that are involved in a chemical equation.

The coefficient of Na is 2 since the number in front of Na in equation above is 2

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A pilgrim uses a block and tackle to lift a 225 N crate a distance of 16.5 m. She pulls 33.0 m of rope with a force of 125 N. Wh

kenny6666 [7]

Answer:

Ideal mechanical advantage of the machine is 2

Explanation:

Ideal mechanical advantage of the machine is

$MA=\frac{op}{ip} \\$

here we have to consider the distance

$MA=\frac{33}{16.5} \\MA=2$

7 0

3 years ago

How did each scientist contributed to cell theory?

LekaFEV [45]

Answer:

Matthias Schleidan

Explanation:

because Matthias Schleiden found that all plants are composed of cells, and communicated the finding to Schwann, who had found similar structures in the cells. Other researchers confirmed the similarity, as explained in his book, where he concluded, "All living things are composed of cells and cell products.

This became the cell theory.

I learn that in my old school.

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3 years ago

What type of electromagnetic radiation can be used as a medical tracer to diagnose disease by being sent through the body's circ

Stolb23 [73]

It c.microwaves !!!!!!!!!!

4 0

3 years ago

Why do planets not travel in a straight path?

Elis [28]

Answer:

Because the gravitational attraction of the Sun hold them in motion around it

Explanation:

For an object travelling in a straight path at constant velocity, the net force acting on the object must be zero.

The planets in the Solar System, however, do not experience a zero net force: in fact, the Sun exerts a gravitational attraction on them, whose magnitude is given by

$F=G\frac{Mm}{r^2}$

where

G is the gravitational constant

M is the mass of the Sun

m is the mass of the planet

r is the average distance between the Sun and the planet

Due to the presence of this force, the Sun makes the planets 'deviating' from their straight path, forcing them to following an elliptical path around the Sun.

6 0

4 years ago

Why does atomic radius decrease from left to right?

victus00 [196]

Because the effective charge of the nucleus increase from left to eight due to the increasing number of protons.

The greater charge pulls the electrons closer to the nucleus, decreasing the radius.

7 0

4 years ago