CHEMISTRY HIGH SCHOOL

A deer that grazes on grasses would be considered a decomposer

primary consumer

tertiary consumer

secondary consumer

Answers

Answer 1
Answer: They are primary consumers since they eat decomposers.

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Particles are arranged in a crystal structure in a sample of:a) H2 (g)b) Br2 (L)c) Ar (g)d) Ag (s)
Solids, liquids, and gases can be distinguished by their
Which process represents a chemical change?(1) melting of ice(2) corrosion of copper(3) evaporation of water(4) crystallization of sugar
Which of these statements best explains why the soil around a volcanic region is fertile? Select one: a. Volcanoes always contribute to flooding, which enriches the soil. b. Volcanoes aid in the formation of new rocks, which help form fertile soil. c. Particles released in the air by volcanoes fall to the ground and enrich the soil.

As a Ca atom undergoes oxidation to Ca2+, the number of neutrons in its nucleus(1) decreases
(2) increases
(3) remains the same

Answers

Answer:

Hence the correct answer is remains the same

Explanation:

As a Ca atom undergoes oxidation to Ca2+,as follows:

Ca --- Ca 2+ + 2e-

In the process of oxidation calcium loss 2 electron only there is no change in the number of protons as well neutrons therefore there is no change in the number of neutrons in its nucleus

Hence the correct answer is remains the same

Oxidation:

Oxidation is a process in which either 1 or all following changes occurs:

1. Gaining of oxygen atoms

2. Loss of electrons

3. Loss of hydrogen atom.

4. Increasing oxidation number.

Reduction:

Reduction is a process in which either 1 or all following changes occurs:

1. Loss of oxygen atoms

2. Gaining of electrons

3. Gaining of hydrogen atom.

4. Decreasing oxidation number.
Oxidation refers to a change in electrons (In this case, loss of electrons). It has no impact on the number of neutrons, or for that matter on any sub-atomic particles in the nucleus. So the number of neutrons (3) remains the same

Which of the following is not an ultimate goal of science? A. Make predictions
B. Produce unchanging, absolute answers
C. Give explanations for natural events
D. Understand patterns

Answers

I think it is B. Produce unchanging, absolute answers
the answer to your question is D. understand patterns if I'm not mistaking

How many occupied orbitals does a fluorine atom contain in the ground state?

Answers

Well, the configuration is 1s^22s^22p^5. To show the electrons, we have 1s as [**], 2s as [**], 2p as [**][**][*-], where * is an electron and - is a vacant slot. We have 5 occupied orbitals (4 fully occupied, one partially occupied)

How do you balance __H2SO4 + __B(OH)3 --> __B2(SO4)3 + __H2O

Answers

B(OH)_3=H_3BO_3

then

H_2SO_4+H_3BO_3\longrightarrow~B_2(SO_4)_3+H_2O

\boxed{3H_2SO_4+2H_3BO_3\longrightarrow~B_2(SO_4)_3+6H_2O}

NASA communicates with the Space Shuttle and International Space Station using Ku-band microwave radio. Suppose NASA transmits a microwave signal to the Space Shuttle using radio waves with a frequency of 18GHz . Calculate the wavelength of these radio waves.

Answers

Answer:

λ = 0.0167 m = 16.7 mm

Explanation:

The wavelength of these radio waves can be found out by using the formula for the speed of radio waves:

v = fλ

where,

v = speed of radio waves = speed of light = 3 x 10⁸ m/s

f = frequency of radio waves = 18 GHz = 18 x 10⁹ Hz

λ = Wavelength = ?

Therefore,

3 x 10⁸ m/s = (18 x 10⁹ Hz)λ

λ = (3 x 10⁸ m/s)/(18 x 10⁹ Hz)

λ = 0.0167 m = 16.7 mm

Which of the following has the greatest number of atoms? a) 1.0 mol He b) 0.60 mol H2 c) 20 g Potassium d) 8.5 mL H2O (density of H2O = 1 g/mL) e) 22.6 g KMnO4

Answers

Answer:

The H2O sample has the greatest number of atoms.  1.41 moles, or (1.041 moles)*(5.023x10^23) atoms

Explanation:

We need to convert each value into moles, a count of the number of atoms/molecules.

a)  1.0 moles He

b)  0.60 moles H2

c)  20 grams K:  convert to moles with the molar mass of K

                       (20 grams K)/(39.1 g/mole K) = 0.511 moles K

d) 8.5 mL H2O (density of H2O = 1 g/mL).

      Find the mass of the H2):  (8.5 ml)*(1 g/ml) = 8.5 grams H2)

      Now calculate moles H2):  (8.5 grams)/(18 grams/mole) = 0.473 moles     H2O

e)  22.6 g KMnO4  

                    (22.6 g KMnO4 )*(158.0 g/mole) = 0.143 moles

Now we need to take into account the number of atoms per molecule:

Molecule  Atoms/Molecule     Moles        Atoms(moles)

He                     1                            1.0               1.0

H2                     2                           0.60            1.2

K                        1                            0.51            0.51

H2O                  3                            0.47            1.41

KMnO4             6                            0.143          0.86

The H2O sample has the greatest number of atoms.  1.41 moles, or (1.041 moles)*(5.023x10^23) atoms
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