What is the mass number of the atom shown?
a. 11
b. 18
d. 20
C. 19

Answer:

Basically, it's heat transfer!

Answer:

An endothermic process is any process with an increase in the enthalpy H of the system. In such a process, a closed system usually absorbs thermal energy from its surroundings, which is heat transfer into the system.

Explanation:

Answer:

I believe it is platinum

Explanation:

I think it is, haha

Answer:

zinc

Explanation:

kwkejnrkewnrkwe

Answer:

A. 2.45 L - Answer my answers is right.

Answer: Resistance slows down the flow of charge in a circuit. The unit of resistance is the ohm (Ω) which is defined as a volt per ampere of current.

Explanation:

Answer:

pollution I think

Explanation:

Answer:

Explanation:

A)  O2 (non polar covalent)

B)  HF  (polar covalent)

C) NaCl (because its ionic)

im not 100% sure hope it helps

Answer:

[tex]\boxed {\boxed {\sf 2.78 \ mol \ Si}}}[/tex]

Explanation:

To convert from grams to moles, we must use the molar mass. This number can be found on the Periodic Table.

We can use number as a ratio.

[tex]\frac { 28.085 \ g \ Si}{ 1 \ mol \ Si}[/tex]

Multiply by the given number of grams.

[tex]78.0 \ g \ Si *\frac { 28.085 \ g \ Si}{ 1 \ mol \ Si}[/tex]

Flip the fraction so the grams of silicon cancel.

[tex]78.0 \ g \ Si *\frac {1 \ mol \ Si }{ 28.085 \ g \ Si}[/tex]

[tex]78.0 *\frac {1 \ mol \ Si }{ 28.085 }[/tex]

[tex]\frac {78.0 \ mol \ Si }{ 28.085 }= 2.77728324729 \ mol \ Si[/tex]

The original number of grams (78.0) has 3 significant figures, so our answer must have the same. For the number of moles calculated, that is the hundredth place. The 7 in the thousandth place tells us to round the 7 to a 8.

[tex]2.78 \ mol \ Si[/tex]

There are about 2.78 moles of silicon in 78.0 grams.

No. The speed of light does change. You mean speed of light in a vacuum. Measuring that value is elementary, in a 2-way measurement, as you show.

Answer:Both atractive and repulsie

Explanation:

Answer:

False

Explanation:

The nucleus controls the cells activities

Answer:

B.

Explanation:

bc it goes from having the potential to move to moving sorry if im wrong tho

Answer:

8.7 × 10-6

Explanation:

sorry if incorrect

Answer:

[tex]8.7 \times {10}^{ - 6} [/tex]

Explanation:

[tex]0.0000087[/tex]

[tex]8.7 \times {10}^{ - 6} [/tex]

Answer:

1. 0.5333333m (Calculator Soup Work Calculator)

2.

9. 29.1666666667% efficient

10. 44.5% efficient

Explanation:

will do other answers later

Answer:

2nd down

Explanation:

''The length of a day on Mercury is much longer than Earth'' is the right answer.

Mercury rotates on its axis very slowly due to which daylength on Mercury is much longer than Earth. A day on Mercury is 1407.5 hours long while a day on Earth is 23.934 hours long and its reason is slower rotation of Mercury so we can conclude that ''The length of a day on Mercury is much longer than Earth'' is the correct option.

Learn more about Mercury here: https://brainly.com/question/879

Answer:

Answer down below!

Explanation:

It would be the force of gravity, because gravity pulls all things toward the center of the Earth. If the book would have fallen down, the force of gravity was put in place.

Answer: The force of gravity

Explanation:

gravity is a force the brings thins towards the core, aka the ground

Answer:

Different atomic mass, number of neutrons

Explanation:

Isotopes refer to atoms of the same element, with same atomic number, number of protons & electrons. However, they have different atomic mass, because of different number of neutrons.

Answer:

When the Zebra arrived they ate all the food so the Unionid mussels declined as they died from the lack of food. Causing the Zebra Zebra numbers to increase and Unionid numbers to decline.

Answer:

Answer:

You must know the concept of pH of a solution and its relation to the concentration of H+ and OH- ions. pH is a measure of the substance's acidity or basicity. From the definition of Arrhenius, an acid contains an H+ while a base contains a OH- ion. From this definition, we can say that an acidic substance has a higher concentration of H+ ions. Now, I'll introduce here that pH is the value of the negative logarithm of the concentration of H+. In equation,

pH = -log[H+]

The term pOH is therefore also, pOH = -log[OH-]. Therefore, the relationship that connects the two negative logarithms is:

pH + pOH = 14

The pH scale starts from 1 being the most acidic to 14 being the most basic. The neutral pH is 7. Thus, for a pH of 7, the H+ and the OH- concentrations are equal.

pH = 7 = -log[H+]

[H+] = 1×10⁻⁷ mol/L = [OH-]

Since the concentrations are equal, the ratio is equal to 1.

Answer:

3832.67

Explanation:

Answer:

the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat

Explanation:

<3

Answer:

Convection when heat travels through metal or appliances.

Explanation:

i dont know man they're weird

Answer:

H2SO4+CU(OH)2 = CUSO4+2H2O

The general neutralization reaction between an acid and a base takes the form: acid + base → salt + water.

If you have some acid HA neutralizing some base BOH, the salt would be an ionic compound composed of the conjugate acid of BOH (i.e., B⁺) and the conjugate base of HA (i.e., A⁻).

Applied here, H2SO4 and Cu(OH)2 would react to form a salt CuSO4 (the Cu²⁺ ions coming from the copper(II) hydroxide and the SO4²⁻ ions coming from the sulfuric acid) and H2O.

Thus, the products of this neutralization reaction would be copper(II) sulfate (CuSO₄) and water (H₂O).

The balanced equation for this reaction would accordingly be:

H₂SO₄ + Cu(OH)₂ → CuSO₄ + 2H₂O.