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Answer:

option b

Explanation:

answer from gauth math

7.95 × 10

= 79.5

This is the answer

Answer:

The answer will be this 30g/cm3

Answer:

i think it will explode

Answer: I did the quiz and got it correct

Explanation:  

Biosphere- B  

Ecosystem- C  

Biome- D  

Habitat- A

Scientific Method

What is Scientific Method

A method or procedure that consists of systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses.

Experiment- The growth of green algae is recorded every day for several weeks and compared

Conclusion- Under the same temperature and water conditions, green algae is grown under natural light, blue light, and green light.

Research-Based on what other scientists have done, algae life cycles are affected by light.

Analysis- The data recorded in the experiment supports the hypothesis about how algae reproduce.

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Answer:

B

Explanation:

because Mg is stronger than Al

The amount of NaCl required to prepare a 600 mL saturated solution depends on the solubility at the temperature.

Solubility is the amount of solute that dissolves in a given volume of solvent.

Solutions may be saturated, unsaturated, super saturated solution.

For solutes, the solubility increases with increase in temperature.

The amount of NaCl required to prepare a 600 mL saturated solution depends on the solubility at the temperature.

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Answer:

240

Explanation:

Answer:

Dùng nam chân hút đc bột sắt ra khỏi hỗn hợp

Bột gỗ và bột nhôm thì bột gỗ tan trong nước còn bột nhôm thì không

Explanation:

Answer:

c. 2 and 3 only

Explanation:

When you compact the bag of trash you make it smaller, so the volume changes. And the density is the mass divided by the volume, so as the volume changed the density obligatorily change too

Answer:

is this true and false? then its true

Explanation:

Answer:

Fe(s) + H2SO4 (aq) ---> FeSO4 (s) + H2 (g)

Explanation:

Answer:

12 g

Explanation:

From the question given above, the following data were:

Number of atoms = 6.02×10²³ atoms

Mass of ₆C¹² =?

From Avogadro's hypothesis,

1 mole of any substance contains 6.02×10²³ atoms. This implies that 1 mole of ₆C¹² also contains 6.02×10²³ atoms i.e

1 mole of ₆C¹² = 6.02×10²³ atoms

Recall

From the period,

1 mole of ₆C¹² = 12 g

Thus,

12 g of ₆C¹² = 6.02×10²³ atoms

Therefore, 12 g of ₆C¹² contains 6.02×10²³ atoms

Answer:

the number of crickets in each container

Explanation:

to participate in the experiment you will have to know the crickets in the container

D. the pupil or the dark portion at the center of the eye

Answer:

The FitnessGram™ Pacer Test is a multistage aerobic capacity test that progressively gets more difficult as it continues. The 20 meter pacer test will begin in 30 seconds. Line up at the start. The running speed starts slowly, but gets faster each minute after you hear this signal. [beep] A single lap should be completed each time you hear this sound. [ding] Remember to run in a straight line, and run as long as possible. The second time you fail to complete a lap before the sound, your test is over.

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Answer:

What

You cant just send notes you also have to say where you are and which book you are using because others are different

Answer:

The answer would be: An atom’s nucleus occupies very little of the atom’s volume but contains most of its mass

Explanation:

The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom.

Almost all of the mass of an atom is located in the nucleus, with a very small contribution from the electron cloud.

Refer to https://en.wikipedia.org/wiki/Atomic_nucleus for further understanding

Answer:

Kinetic energy

Explanation:

Kinetic energy is the energy associated with an object's motion. It is mass and velocity dependent by a directly proportional relationship.

Potential energy is the energy associated with an object's position.

Thermal energy is the energy associated with heat addition or withdrawal.

Kinetic energy is the energy that a body possesses because of its movement, that is, it is the energy that arises when objects are in motion.

Therefore, we can conclude that kinetic energy is the energy produced by its movements that depends on its mass and speed.

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Explanation:

Ca(OH) is a base

pOH = -Log[OH]

[OH] = 0.05

pOH = -Log(0.05)

pOH = 1.3

pH + pOH = 14

pH = 14 - pOH

pH = 14 - 2

pH = 12.7

Answer:

No Sodium(Na) in methylene

Explanation:

Methylene is an organic compound

Answer:

[tex]400 \div 6 \\ \\ [/tex]

Answer:

Oh man, the questions are much

Explanation:

1. Hard water is water what has high mineral content. (I can't go into details )

2. River, reservoir, Lake, groundwater, rain

3. H2O

4. POW is the process of removing undesirable chemicals, biological contaminants, suspended solids and gases from water.

5. Reduces amount of chlorine, soil residue, and organic and inorganic substances. Helps in improving the taste. Smell and visual appearance of water.

6. Boiling, filtration, distillation, and chlorination

7. Dust, dirt, harmful chemicals, biological contaminants, radiological contaminants

8. It is the contamination of water bodies, usually as a result of human activities, in such a manner that negatively affects it legitimate uses.

9. Colorless, turbidity, taste And odor.

10. Hardness of water is caused by compounds of calcium and magnesium, and by a variety of other metals.

Answer:

cooling a liquid

Explanation:

Temperature is lowered and the energy of molecules, and therefore number of available configuration , is lowered

The thermal energy present in the system for the product formation is entropy. Cooling a liquid can decrease the entropy of the thermodynamic system. Thus, option C is correct.

Entropy is the energy and the heat present in the reactant of the thermodynamic system that is associated with the randomness and disorder of the particle matter in the reaction system.

Entropy is dependent on factors like dissolution, temperature, randomness, kinetic energy, etc. The entropy increases with an increase in the dissolution and tempearture.

The process of cooling liquid lowers the temperature which in turn decreases the kinetic energy and randomness of the molecules and at last, the entropy decreases.

Therefore, the cooling of the liquid decreases the entropy.

Learn more about entropy here:

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Explanation:

The steps given in the question are incorrect.

Step 1 should be convert atoms to moles (n). Step 2 should be convert moles (n) to mass (m).

Step 1

Use dimensional analysis to convert the number of atoms to moles.

1 mole atoms = 6.022 × 10²³ atoms

n(Ag) = 2.3 × 10²⁴ Ag atoms × (1 mol Ag/6.022 × 10²³ Ag atoms) = 3.8193 mol Ag

Step 2

Convert the moles of Ag to mass.

mass (m) = moles (n) × molar mass (M)

n(Ag) = 3.8193 mol Ag

M(Ag) = atomic weight on the periodic table in g/mol = 107.868 g Ag/mol Ag

m(Ag) = 3.8193 mol × 107.868 g/mol = 412 g Ag = 410 g Ag rounded to two significant figures

The mass of 2.3 × 10²⁴ Ag atoms is approximately 410 g.

Answer:

[tex]\boxed {\boxed {\sf 3.8 \ moles \ of \ sulfur}}[/tex]

Explanation:

We are asked to convert a number of atoms to moles.

We can convert atoms to moles using Avogadro's Number, which is 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this problem, the particles are atoms of sulfur. There are 6.022 ×10²³ atoms of sulfur in 1 mole of sulfur.

We use dimensional analysis to convert atoms to moles. This involves setting up ratios. Use Avogadro's Number and the underlined information to make a ratio.

[tex]\frac {6.022 \times 10^{23} \ atoms \ S}{1 \ mol \ S}[/tex]

We are converting 2.3 ×10²⁴ atoms of sulfur to moles, so we multiply by this value.

[tex]2.3 \times 10^{24} \ atoms \ S *\frac {6.022 \times 10^{23} \ atoms \ S}{1 \ mol \ S}[/tex]

Flip the ratio. It is equivalent, but it allows the units of atoms of sulfur to cancel.

[tex]2.3 \times 10^{24} \ atoms \ S *\frac {1 \ mol \ S}{6.022 \times 10^{23} \ atoms \ S}[/tex]

[tex]2.3 \times 10^{24} *\frac {1 \ mol \ S}{6.022 \times 10^{23} }[/tex]

[tex]\frac {2.3 \times 10^{24} }{6.022 \times 10^{23} } \ mol \ S[/tex]

[tex]3.819329127 \ mol \ S[/tex]

The original measurement of atoms (2.3 ×10²⁴) has 2 significant figures, so our answer must have the same. For the number we calculated that is the tenths place. The 1 in the hundredths place to the right (3.819329127) tells us to leave the 8 in the tenths place (3.819329127).

[tex]3.8 \ mol \ S[/tex]

2.3 ×10²⁴ atoms of sulfur is equal to approximately 3.8 moles of sulfur.

Answer:

The mole ratio of H : O in ammonium nitrate is 4 : 3.

Explanation:

We are given a compound named ammonium nitrate having formula

There are 3 elements in this compound which are nitrogen, hydrogen and oxygen.

To calculate the mole ratio, we write the ratio of their subscripts. For this compound,

Answer:

The breaking of the hydrogen bonds due to the force relieves the torsional stress stored in a double helix. As a result, the nucleotide strands rotate more freely about the axis of a helix and start unwinding. ... The DNA unzipping and the DNA unwinding result in a structural transformation from dsDNA to ssDNA.

Answer:

B. the particles in the surroundings move faster and have increased entropy

Explanation:

An exothermic process releases heat, causing the temperatures of the surroundings to increase. Entropy increases as temperature increases. Since an exothermic reaction releases heat to the surroundings, molecules in the surroundings will begin to move faster because they will absorb more energy, which increases their kinetic energy. An increase in temperatures means that the particles of the surroundings have greater kinetic energy. The faster moving particals have more disorder than particles that are moving more slowly at a lower temperature. Entropy is interpreted as the degree of disorder/randomness.

Answer:

[tex]\rm K[/tex]: approximately [tex]22.0\%[/tex].

[tex]\rm Cl[/tex]: approximately [tex]19.9\%[/tex].

[tex]\rm O[/tex]: approximately [tex]27.0\%[/tex].

[tex]\rm Al[/tex]: [tex]31.0\%[/tex].

Explanation:

Consider a [tex]100\; \rm g[/tex] sample. There would be [tex]69.0\% \times 100\; \rm g = 69.0\; \rm g[/tex] of [tex]\rm KClO_{3}[/tex] and [tex]100.0\; \rm g - 69.0\; \rm g = 31.0\; \rm g[/tex] of [tex]\rm Al[/tex].

Out of that [tex]69.0\; \rm g[/tex] of [tex]\rm KClO_{3}[/tex]:

[tex]31.9\%[/tex] (by mass) would be [tex]\rm K[/tex]: [tex]31.9\% \times 69.0\; \rm g \approx 22.0\; \rm g[/tex].

[tex]28.9\%[/tex] (by mass) would be [tex]\rm Cl[/tex]: [tex]28.9\% \times 69.0\; \rm g \approx 19.9\; \rm g[/tex].

[tex]39.2\%[/tex] (by mass) would be [tex]\rm O[/tex]: [tex]39.2\% \times 69.0\; \rm g \approx 27.0\; \rm g[/tex].

Overall, the composition (by mass) of each element in this mixture would be:

[tex]\rm K[/tex]:

[tex]\begin{aligned} & \frac{31.9\% \times 69.0\; \rm g}{100\; \rm g} \\ =\; & 31.9\% \times 69.0\% \\ \approx \; & 22.0\%\end{aligned}[/tex].

[tex]\rm Cl[/tex]:

[tex]\begin{aligned} & \frac{28.9\% \times 69.0\; \rm g}{100\; \rm g} \\ =\; & 28.9\% \times 69.0\% \\ \approx \; & 19.9\%\end{aligned}[/tex].

[tex]\rm O[/tex]:

[tex]\begin{aligned} & \frac{39.2\% \times 69.0\; \rm g}{100\; \rm g} \\ =\; & 39.2\% \times 69.0\% \\ \approx \; & 27.0\%\end{aligned}[/tex].

[tex]\rm Al[/tex]:

[tex]\begin{aligned}& \frac{100\; \rm g - 69.0\; \rm g}{100\; \rm g} \\ =\; & 100\% - 69.0\% \\ =\; & 31.0\%\end{aligned}[/tex].

The three major categories of energy for electricity generation are fossil fuels (coal, natural gas, and petroleum), nuclear energy, and renewable energy sources.