CHEMISTRY HIGH SCHOOL

An aqueous solution has a mass of 490 gramscontaining 8.5 103 gram of calcium ions. The
concentration of calcium ions in this solution is
(1) 4.3 ppm (3) 17 ppm
(2) 8.5 ppm (4) 34 ppm

Answers

Answer 1
Answer: One way of expressing concentration is by expressing it by parts per million or ppm. Parts per million is equal to 1 milligram of solute per kilogram of solution. The problem is solved as follows:
ppm = .0085103 mg / .490 kg = 0.017 ppm

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Green plants need light in order to survive Structures in the leaves absorb light, which in turn, helps plants make theirown tood
Under which color of light will plants be least likely to make food?
red
blue
orange
green

Answers

Answer:

The color of light in which plants are less likely to produce food is green.

Explanation:

Photosynthesis is the process by which plants take advantage of sunlight to convert it into chemical energy, necessary to manufacture their nutrients, their growth and development.

Plants do not absorb all the colors of the light spectrum, since due to their pigments they absorb colors with specific wavelengths. Green plants do not absorb the color green, but reflect it —due to the chlorophyll pigment— which gives the green color to those leaves.

For this reason, the light that plants take least advantage of to produce food is green light.

Other options:

    The colors blue, orange and red can be absorbed by the plant, to a lesser or greater degree.

Answer:

it would be green

Explanation:

Atomic energy is the energy _____. in the nucleus of an atom of electrons and their shells in chemical bonds of elements and compounds

Answers

The correct statement to fill the blank would be the first option. Atomic energy is the energy in the nucleus of an atom of electrons and their shells. From the word atomic itself, we can say that this energy is energy within and carried by the atoms.

Answer:

in the nucleus of an atom

Explanation:

If my dog weighs 31.8 kilograms, how much would she weigh in ounces? Round your to the 1st decimal place.

Answers

your dog would weigh 1121.7 ounces

What form of energy provides power for a gas stove?A.nuclear energy
B.electrical energy
C.chemical energy
D.sound energy

Can you explain the answer for me ?

Answers

C . chemical energy will be the answer. In a gas stove, LPG is stored and it is brought out and it reacts with oxygen to give out heat energy. all the other options are not convincing and hence chemical energy is the best answer. 

Which of the following will stay constant, no matter if the substance is in the solid, liquid, or gas state? volume shape temperature mass

Answers

Answer : The correct option is, Mass

Explanation :

As we know that there are 3 states of matter :

Solid state : It is a state in which the particles are closely packed and does not have any space between them. This state have a definite shape and volume.

Liquid state : It is a state in which the particles are present in random and irregular pattern. The particles are closely arranged but they can move from one place to another. This state have a definite volume but does not have a fixed shape.

Gaseous state : It is a state in which the particles are loosely arranged and have a lot of space between them. This state have indefinite volume as well as shape.

If we are taking 100 grams of ice then after melting its mass remains same but its shape, volume and temperature will be changed and after evaporation its mass remains same but its shape, volume and temperature will be changed.

Hence, the mass will stay constant, no matter if the substance is in the solid, liquid, or gas state.

Answer:

The correct answer is mass

Explanation:

Hello!

Let's solve this!

In the solid state, where the molecules occupy a definite place, and remain still, the shape and volume remain constant.

In the liquid state the molecules take the form of the container that contains them. So the shape is not defined but the volume is defined.

In the gaseous state the molecules are disordered, and have neither defined volume nor shape.

In all three states the mass remains constant.

The temperature causes the change of state.

We conclude that the correct answer is mass

Hey! If someone could help me out I would really appreciate it even if it was just one answer. I'm really stuck on 3. Its second year of chem!

Answers

Answer:

I would go for number 5 . It sounds more logical to me.

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