Which of these equations is balanced? A. H2O+Co ---> H2Co3 B. 2NaCl +H2SO4 ----> Na2SO4 + 2HCl C. 2CaO+ H2O ----> Ca(OH)2 D. Mn +Fe ----> MnS + Fe

Answers

Answer 1

Answer:

Answer is: B. 2NaCl +H2SO4 ----> Na2SO4 + 2HCl.

According to principle of mass conservation, number of atoms must be equal on both side of balanced chemical reaction.

There are two sodium atoms, two chlorine atoms, two hydrogen atoms, one sulfur atom and four oxygen atoms on both side of balanced chemical reaction.

A) This reaction is not balanced, because number of oxygen atoms are not the same.

C) This reaction is not balanced, because number of oxygen and calcium atoms are not the same.

D) This reaction is not balanced, because number of sulfur atoms are not the same.

Answer 2

Answer:

The equatin that is balanced is 2NaCl + H2SO4 → Na2SO4 + 2HCl. The answer is letter B. The reactant has two Na, 2 Cl, 2 H, 1 S and 4 O. These number of atoms is also the same for the product side.

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What is the difference between the orbital periods of Mercury and Earth?Select one:
a. 0.61 years
b. 0.76 years
c. 1.24 years
d. 1.39 years

Answers

The correct answer is B. The difference between the orbital period of planets Mercury and Earth is 0.76 years. The orbit of mercury is the most eccentric among the planets in the Solar system and the smallest planet. It has an orbital period of 88 Earth days.

Answer:

b. 0.76 years

Explanation:

Mercury is the closest planet to the Sun and the Earth is the third planet from the Sun.

The orbital period of the Earth is 1 year.

Orbital period of the Mercury is 88 days = 0.24 years (Earth years)

Thus, the difference between the orbital periods of Mercury and Earth is

1 year - 0.24 years = 0.76 years

Thus, the correct option is b.

Insulin is a protein that is used by the body to regulate both carbohydrate and fat metabolism. A bottle contains 375 mL of insulin at a concentration of 40.0 mg/mL . What is the total mass of insulin in the bottle?

Answers

To solve multiply the mL by the mg/ml so 375*40=15000mg

Why would a person could jump further on moon than on Jupiter?

Answers

In short, because the moon is smaller, its gravitational force is too. Therefore, if there is less gravity, it would be easier to jump further than on a bigger planet like Jupiter.

Explanation:
The Moon has less mass than the world, which implies it's less gravity than the world further.

Since the gravity is not propulsion on the U.S. as powerfully on the moon because it is on Earth, we are able to jump higher and with a lot of ease.
That's as a result of our muscles (and all alternative body elements concerned, like our bones and joints and heart and lungs) all were developed and conditioned to figure within the stronger gravity on the surface.

In short, because the moon is smaller, its gravitational force is too. Therefore, if there is less gravity, it would be easier to jump further than on a bigger planet like jupiter

A gas that extinguishes a flame is hydrogen. true or false

Answers

This is true because it reacts with oxygen

Process in which water vapor turns to liquid

Answers

Explanation:

When water is collected from vapour form to liquid form then this process is known as condensation.

For example, water evaporated from the atmosphere reaches to the clouds and it gets converted into liquid form and again reaches to Earth in the form of rain.

Thus, we can conclude that process in which water vapor turns to liquid is called condensation.

In the amtmosphere this water vapor cools and turns back to liquid for forming clouds
this process is called condensation. When it cant hold on much longer it will turn into rain or snow.

When light waves hit ice, most of them bounce off and radiate back into space. Because of this, ice is best described as which kind of surface? reflective absorbent dense rough

Answers

The bouncing back of light waves observed when light waves hit ice and most of them bounce off and radiate back into space is called reflection.

What are light waves?

Light waves are a form of waves which produces visible sensitization of the eyes

Light waves have properties of waves such as:

reflection
refraction
diffraction
interference, etc.

When light waves hit ice, most of them bounce off and radiate back into space.

This property of light waves is known as reflection.

Learn more about reflection of light waves at: brainly.com/question/1191238

When light waves hit ice, most of them bounce off and radiate back into space, hence, ice is best described as a reflective surface.

What is a Reflective surface?

A reflective surface is one which can cause incident light to bounce back (reflection).

According to this question, when light waves hit ice, most of them bounce off and radiate back into space. This means that most of the incident lightreflects off the ice surface.

Therefore, the ice surface is best described as a reflective surface.

Learn more about reflection at: brainly.com/question/8553652

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