Which equation shows how to calculate how many grams (g) of KOH would
be needed to fully react with 4 mol Mg(OH)2? The balanced reaction is:
MgCl2 + 2KOH → Mg(OH)2 + 2KCI

Answer:

mars

Explanation:

just googled it

In addition to Earth, mars  planet has evidence of water on the surface.

Evidence proves that financing results  works Our strong evidence based on the  proves that more lives and real can be changed through access to affordable inventing  for water and sanitation.

Evidence of finding water on Mars first to be known  in 2000, with the appearance of gullies that suggested us about  a liquid origin. Their formation has been hotly in  debated over the ensuing years.

Therefore, addition to Earth, mars  planet has evidence of water on the surface.

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Answer:

Explanation:

1. Sodium

2. Ammonium Carbonate

3. Potassium phosphate

4. Calcium sulphate

5. Zinc nitrate

6. Iron(III) oxide-hydroxide

7. Aluminium phosphate

8.Cobalt(III) Carbonate

9. Iron(II) sulfate

10. Magnesium chloride

11. Nitric acid

Answer:

1. Sodium

2. Ammonium Carbonate

3. Potassium phosphate

4. Calcium sulphate

5. Zinc nitrate

6. Iron(III) oxide-hydroxide

7. Aluminium phosphate

8.Cobalt(III) Carbonate

9. Iron(II) sulfate

10. Magnesium chloride

11. Nitric acid

Explanation:

Answer:

Open ended question

Explanation:

Built different :]

Answer:

if an OPEN end question is too challenging respondents will abandon the surevy

Explanation:

Answer:

Ethanol + Potassium Permanganate + Sulfuric Acid = Acetic Acid + Manganese(II) Sulfate + Water + Potassium Sulfate

Explanation:

Answer:

7.3 x 10¹⁴Hz

Explanation:

Given parameters:

Wavelength  = 4.105 x 10⁻⁷m

Unknown:

Frequency of the light  =?

Solution:

The frequency, wavelength and speed of a wave are related using the expression below;

           C = f λ

C is the speed of light = 3 x 10⁸

f is the frequency

λ is the wavelength

      3 x 10⁸ = f x 4.105 x 10⁻⁷

              f  = [tex]\frac{3 x 10^{8} }{4.105 x 10^{-7} }[/tex]   = 7.3 x 10¹⁴Hz

Answer:

7.3 x 10¹⁴Hz

Explanation:

Answer:

Explanation:

NaClO3

Atomic masses:

Na =23

Cl=35.5

O=16

Molar mass=(23)+(35.5)+(3×16) =106.5g/mol

Answer: The organism generally must have hard parts such as shell, bone, teeth, or wood tissue; the remains must escape destruction after death; and the remains must be buried rapidly to stop decomposition. This does make the fossil record biased because animals with soft bodies are less likely to form fossils.

Explanation:

Answer:

9146

Explanation:

Answer:

9146

Explanation:

9146

The concentration of [OH-]  -hydroxide ion : 1.2 x 10⁺⁴ M

H₂O ionization reaction

2 H₂O ⇌ OH− + H₃O⁺

The water equilibrium constant (Kw) is the product of concentration

the ions:

Kw = [H₃O +] [OH-]

Kw value at 25° C = 10⁻¹⁴

It is known  [H₃O +]=8.4 x 10⁻¹¹ M

then the concentration of [OH-]  -hydroxide ion :

[tex]\tt 10^{-14}=8.4\times 10^{-11}\times [OH^-][/tex]

[tex]\tt [OH^-]=\dfrac{10^{-14}}{8.4\times 10^{-11}}=1.19\times 10^{-4}\approx 1.2\times 10^{-4}[/tex]

Answer:

The answer is C

Explanation:

If we assume the sum of energy that could be obtained by absolutely transforming a unit of length, m. It is compared to the speed of light in this connection. In this case, the whole mass of the electron becomes force. In this, depending on the relation of Einstein, each electron can generate 510 keV, which is why only the option of "c" is right.

Answer:

6.grass

7.xylem

8.oval

9. poor growth of bones and teetn

Answer:

the 4s subshell is lower in energy than the 3d subshell

Explanation:

In the element number 24 which is chromium

the electronic configuration should be according to Aufbau principle

will be  = [tex]1s^22s^22p^63s^23p^64s^23d^4[/tex]

but in reality it is = [tex]1s^22s^22p^63s^23p^64s^13d^5[/tex]

The 6 electrons in the outermost shell will be divided as 5 in 3d subshell and 1 in 4s shell, because half filled orbital [tex]4s^13d^5[/tex] will be more stable than [tex]4s^23d^4[/tex].

Explanation:

Solar panels are visible on roof tops on homes and businesses. Solar thermal technology transforms solar energy to heat, which is then used to heat homes, businesses and even swimming pools, or transformed again into electricity.

Answer:

Solar panels are visible on roof tops on homes and businesses. Solar thermal technology transforms solar energy to heat, which is then used to heat homes, businesses and even swimming pools, or transformed again into electricity.

Answer/Explanation:

Chlorine and Fluorine are in the Halogen family. The elements in the Halogen family are:

Fluorine (F)

Chlorine (Cl)

Bromine (Br)

Iodine (I)

Astatine (At)

Tennessine (Ts)

Hydrogen (H) is a nonmetal

Oxygen (O) is a nonmetal

Lithium (Li) is an alkaline metal.

Answer/Explanation:

Chlorine and Fluorine are in the Halogen family. The elements in the Halogen family are:

Fluorine (F)

Chlorine (Cl)

Bromine (Br)

Iodine (I)

Astatine (At)

Tennessine (Ts)

Hydrogen (H) is a nonmetal

Oxygen (O) is a nonmetal

Lithium (Li) is an alkaline metal.

Answer:

c: Yes, if each sample contains 6.02 x 1023 atoms.

Explanation:

got it right on the test <3

Yes, if each sample contains 6.022×10²³ atoms. Therefore, the correct option is option C among all the given options.

In chemistry, a mole, usually spelt mol, is a common scientific measurement unit for significant amounts of very small objects like atoms, molecules, and other predetermined particles. Every material has the same amount of atoms and other particles inside of a mole. The mole has the following relationship to an element's mass: One moles of carbon twelve atoms weighs 12 grammes and has  6.022×10²³ atoms.

In contrast, a mole of oxygen weighs 15.999 grammes despite having the same amount of atoms as a mole of carbon-12 by definition. As a result, oxygen is heavier than carbon. The same logic can be used to determine the weights of molecules or formulas. Yes, if each sample contains  6.022×10²³  atoms.

Therefore, the correct option is option C.

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Answer:

The body-centred cubic (bcc) structure is the most stable form for sodium metal at 298 K (25°C). Under normal conditions, all of the Group 1 (alakali metals) elements are based upon the bcc structure. The closest Na-Na separation is 372 pm implying a sodium metallic radius of 186 pm.

Explanation:

Answer:

60 miles

Explanation:

If the car is moving 30 mph, every hour the car has traveled 30 miles. Therefore, if the car travels for two hours, the car has traveled 60 miles if the same speed of 30 mph remained consistent.

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

From the question we have

[tex]density = \frac{140}{6} = \frac{70}{3} \\ = 23.3333...[/tex]

We have the final answer as

Hope this helps you

Answer: fluprine

Hope this help

Answer:

2.13 atm

Explanation:

Answer:

λ =  521nm

Explanation:

To convert wavelength to frequency we need to use the equation:

ν = c / λ

Where ν is frequency: 5.76x10¹⁴s⁻¹;

c is speed of light: 3x10⁸ms⁻¹;

And λ is wavelength in m:

Wavelength is:

λ = c / ν

λ = 3x10⁸ms⁻¹ / 5.76x10¹⁴s⁻¹

λ = 5.21x10⁻⁷m

= 521nm

The wavelength of a photon of green light that has a frequency (v) of 5.76x10¹⁴ s-¹ is 5.21 × 10-⁷m

HOW TO CALCULATE WAVELENGTH:

λ = v/f

Where;

λ = 3 × 10⁸ ÷ 5.76 x 10¹⁴

λ = 3/5.76 × 10⁸-¹⁴

λ = 0.521 × 10-⁶

λ = 5.21 × 10-⁷m

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Answer:

Density, mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume.

Explanation:

Hopefully that helped:/

Answer: Density, mass of a unit volume of a material substance. Hope this helps!

Answer: a mixture

Explanation:

If you wanted to know the volume of water in a big bottle of soda,  you would use a unit known as liters. Thus, the correct option for this question is 3.

Volume may be defined as the amount of space occupied by a three-dimensional figure as measured in cubic units. It is generally a physical quantity of any object or substance.

As we all know that water is a liquid. So, the volume of liquid is always measured in liters. The density of water is sufficient in order to measure it in liters. While the volume of small quantity measurements like medicinal liquids is measured in milliliters.

Therefore, a liter is a unit in which the volume of water is usually measured. Thus, the correct option for this question is 3.

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Answer:

pseudoscience

Explanation:

The term "pseudoscience" can be used to describe a single assertion or claim that is allegedly supported by facts or science but falls apart when put to the test of reason. Here the given sentence is a pseudoscience.

A statement, discovery, or explanatory system that is presented as pseudoscience lacks the objectivity required by the scientific process. Research that is based on dubious ideas, a defective experimental design, or unreliable data can also lead to pseudoscience.

Pseudoscience may be presented in good faith due to incomplete or inaccurate data analysis. However, it is also possible to deliberately apply scientific methods incorrectly in order to instill unjustified confidence in conclusions that would not be supported by a more rigorous approach.

Many pseudosciences, like astrology, are reasonably safe. Others, nevertheless, might be employed to offer "scientific" justification for unethical behaviour.

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Answer:

11. physical

19. chemical

10. chemical

12. physical

18. chemical

Explanation:

that should be right, I'm not exactly sure though

Step 1: Separate the whole reaction into two half-reactions

HCOOH → CO2 MnO4- → Mn2+

Step 2: Balance the non-hydrogen and non-oxygen elements first

HCOOH → CO2 MnO4- → Mn2+

(C is balanced) (Mn is balanced)

Step 3: Balance oxygen by adding H2O(l) to the side that needs oxygen (1 O : 1 H2O)

HCOOH → CO2 MnO4- → Mn2+ + 4H2O

Step 4: Balance hydrogen by adding H+ to the side that needs hydrogen (1 H: 1 H+)

HCOOH → CO2 + 2H+ 8H+ + MnO4- → Mn2+ + 4H2O

Step 5: Balance the charges: add electrons to the more positive side (or less negative side)

HCOOH → CO2 + 2H+ 8H+ + MnO4- → Mn2+ + 4H2O

Reactants Products Reactants Products

HCOOH = 0 2H+ = +2 8H+ =+8 Mn2+ =+2

__MnO4- = -1________________________

Overall = 0 +2 +7 overall = +2

+2e- +5e-

0 +2

Step 6: Balance electrons on the two half-reactions

5[HCOOH → CO2 + 2H+ +2e-]

2[5e- + 8H+ + MnO4- → Mn2+ + 4H2O]

5HCOOH → 5CO2 + 10H+ + 10e-

10e- + 16H+ + 2MnO4- → 2Mn2+ + 8H2O

Step 7: Get the overall reaction by adding the two reaction.

5HCOOH → 5CO2 + 10H+ + 10e-

10e- + 16H+ + 2MnO4- → 2Mn2+ + 8H2O

5HCOOH + 6H+ + 2MnO4- → 2Mn2+ + 8H2O + 5CO2

Balanced Redox Reaction:

5HCOOH + 6H+ + 2MnO4- → 2Mn2+ + 8H2O + 5CO2