2. How can glass be a liquid if it's so hard?

Answer: Zinc + Phosphoric Acid = Zinc Phosphate + Dihydrogen

Explanation:

Answer:

A metallic bond.

Explanation:

Potassium is a metal (alkali metal), hence its bonds are metallic bonds.

Hope this helped!

Answer:

metallic bond............

Answer:

D. 4Fe + 302 --> 2Fe2O3

Explanation:

The equation that bests supports the law of conservation of mass is the choice D;

       4Fe  +   3O₂  →   2Fe₂O₃

Based on the law of conservation of mass, the number of atoms on both sides of the expression must be the same. Only the fourth choice proves this law;

           4Fe  +   3O₂  →   2Fe₂O₃

                                                Number of atoms

    Elements              Left hand side                            Right hand side

        Fe                                4                                                     4

        O                                 6                                                      6

We can see that both side of the expression have the same number of atoms and the equation is balanced.  

Answer:

Hydrogen

Explanation:

Hydrogen is universe's most simple element, which is most likely why it is the most abundant.

It's called phototropism

Answer:

The answer is (Phototropism)

Volume of Cl₂ = 9.34 L

Reaction

2NaI + Cl₂ ⇒ 2NaCl + I₂

mol NaI (MW=149,89 g/mol) :

[tex]\tt \dfrac{125}{149,89}=0.834[/tex]

mol Cl₂ : mol NaI = 1 : 2

mol Cl₂ :

[tex]\tt \dfrac{1}{2}\times 0.834=0.417[/tex]

Assumptions at STP(1 mol=22.4 L) :

[tex]\tt 0.417\times 22.4~L=9.34~L[/tex]

Answer:

B. Unfilled d orbitals

Explanation:

Answer:

burning causes pollution cutting results furniture

Explanation:

are u a nepali ?

Answer:

burning of wood, new substances are formed and hence it is a chemical change. While cutting the wood into small pieces no new substance is formed, thus it is a physical change. Hence, burning of wood and cutting it into small pieces are considered as two different types of changes.

Answer:

no the answer is oxidation

The statements are;

A) All waves travel at the same speed if no medium is present.

B) Electromagnetic waves require a medium, but mechanical waves do not.

C) All waves travel at the same speed through any medium.

D) Mechanical waves require a medium, but electromagnetic waves do not.

Answer:

Statement D is true.

Mechanical waves require a medium, but electromagnetic waves do not.

Explanation:

The two types of waves are;

Mechanical waves and Electromagnetic waves.

Mechanical waves require a medium, such as an atmosphere or water, to enable it transport its energy. For example sound waves occur when you clap and thereby distort the air around.

Whereas, Electromagnetic waves do not require a medium to enable it transport its energy. A good example would be light. Normally, Electromagnetic waves are usually formed when the electric field and the magnetic field are perpendicular to each other.

So electromagnetic waves can transmit without a medium because electric and magnetic fields can exist independently without a medium.

Answer:

21%

Explanation:

nitrogen takes up more than half so it can't be the 2 biggest answers cause both are more than 50 and the smallest answer would have to be for the little sliver of the pie chart

Answer: 21%

Explanation:

Answer:

Input work is the work done on a machine as the input force acts through the input distance. This is in contrast to output work which is a force that is applied by the body or system to something else. Output work is the work done by a machine as the output force acts through the output distance.Jan 15, 2020 bahsgsh bvshgs d hg

Answer:

sodium and phosphorus

Explanation:

sodium combines with phosphorus to produce sodium phosphate

Explanation:

I hope understand this

Answer:

2Ag^+(aq) + 2Cl^-(aq) --------> 2AgCl(s)

Explanation:

The net ionic equation reflects the main reaction that occurred in the system. It tells you the most important reaction that took place.

If we first put down the balanced molecular equation for the reaction, we have;

CaCl2(aq) + 2 AgC2H3O2(aq) ---------> 2 AgCl(s) + Ca(C2H3O2)2 (aq)

The net ionic equation is;

2Ag^+(aq) + 2Cl^-(aq) --------> 2AgCl(s)

Answer:

Valence Electrons

Explanation:

Answer:

Ionic bonds contain electrovalent bond

Explanation:

Ionic bond, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.

Answer: An atom can be considered unstable in one of two ways. If it picks up or loses an electron, it becomes electrically charged and highly reactive. Such electrically charged atoms are known as ions. Instability can also occur in the nucleus when the number of protons and neutrons is unbalanced.

Explanation:

Answer:

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Answer:

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Explanation:

common sense

Answer:

The theory of plate tectonics states that the Earth's solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle. Oceanic and continental plates come together, spread apart, and interact at boundaries all over the planet.

Explanation:

From Google

Answer:

120G

Explanation:

From the combustion process, about 120G of carbon dioxide would be released into the atmosphere.

For the chemical reaction to obey the law of conservation of matter, if only ash and carbon dioxide are the product, then the sum of the mass of the product and that of the reactants must be the same.

   In a chemical reaction, matter is not created nor destroyed, but they are simply changed from one form to another.

   Mass of wood burning  = mass of ash + mass of CO₂

              150G  = 30G + mass of CO₂

         mass of CO₂ = 150G  - 30G  = 120G

Answer:

true is the answer of first

Answer:

Ca3(PO4)2 and Na

Explanation:

The reaction equation is;

3Ca + 2Na3PO3 -------> Ca3(PO3)2 + 6Na

We must remember that calcium is above sodium in the electrochemical series. This implies that calcium can displace sodium from its solution. Calcium has a reduction potential of -2.87 V while sodium has a reduction potential of -2.71 V. The ion with the more negative reduction potential can easily displace the other in aqueous solution.

This explains why the reaction above is possible.

Answer:

hydrochloric acid

Explanation:

These anions usually have the ending “-ide.” As acids, these compounds are named starting with the prefix “hydro-,” then adding the first syllable of the anion, then the suffix “-ic.” For example, HCl, which is hydrogen and chlorine, is called hydrochloric acid. More complex acids have oxygen in the compound.

Question:

A student weighed an empty graduated cylinder. It weighed 35.86 g. She then carefully added water to the graduated cylinder until it reached the 7.5 mL mark. When she weighed the graduated cylinder again, this time with the 7.5 mL of water in it, it weighed 43.18 g. What was this student's experimental density of water?

Answer:

0.976 g/mL

Explanation:

Weight of empty cylinder = 35.86g

Volume of water = 7.5mL

Weight of cylinder + water = 43.18g

Experimental density = ?

Density of water = Mass of water / volume of water

Mass of water = (Weight of cylinder + water) - Weight of empty cylinder

Mass of water = 43.18 - 35.86 = 7.32g

Density = 7.32 / 7.5 = 0.976 g/mL

Answer:

there are 4 sig figs in 120.9 and there are 4 sig figs in 1.008

Explanation:

Answer:

Fairly certain it is the tension of the string

Answer:It would be C

Answer:  The temperature of a beaker of water is 318.2 K.

Explanation:

Multiplying the temperature in Celsius by tells us how many Fahrenheit degrees above the freezing .

Answer:

Ductility and Malleability

Explanation:

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Answer:

the correct answer is Ductility and Malleability....(B)....

Explanation:

I took the test, hope this helps. also the person above me is correct