Hello. Can someone help me do these few questions. Thanks

Explanation:

A hydrogen atom is an atom of the chemical element hydrogen. The electrically neutral atom contains a single positively charged proton and a single negatively charged electron bound to the nucleus by the Coulomb force. Atomic hydrogen constitutes about 75% of the baryonic mass of the universe.

Names: hydrogen atom, H-1, protium, ¹H

Protons: 1

Neutrons: 0

Symbol: 1H

Answer:

The hydrogen atom has a nucleus consisting of a proton bearing one unit of positive electrical charge; an electron, bearing one unit of negative electrical charge, is also associated with this nucleus.

Explanation:

Answer:  30 L

Explanation:  Use the combined gas law:  P1V1/T1 = P2V2/T2

We want V2, so rearrange:

V2 = V1(T2/T1)(P1/P2)

Note how I've grouped the temperature and pressure into ratios.  This allows us to cancle those units quickly and gives a perspective on what we should expect.  Enter the data:

V2 = (23L)*(0.6667)*(0.8571)

V2 = 29.6 L  30 L for 2 sig figs

I think it's 6

Explanation:

zeros between other nonzero digits are significant

ex. 50.3 has 3 significant figures. ex. 8101.01 has 6 significant figures

Explanation:

Review and Study Material Before Going to Class. ...

Take Good Notes. ...

Practice Daily. ...

Take Advantage of Lab Time. ...

Use Flashcards. ...

Use Study Groups. ...

Break Large Tasks Into Smaller Ones.

reading a variety of chemistry books

Answer:

An ion is an atom or molecule that carries an electric charge.

Ions are identified by the use of a superscript to show the sign and size of their electric charge.

Negatively charged ions are called anions, and positively charged ions are called cations.

Explanation:

An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across.

Explanation:

1 grams Ammonia to mol = 0.05872 mol

mass of ammonia = 2.75÷ 0.05872

mass of ammonia=46.8324250681 gm

Answer:

[tex]\boxed {\boxed {\sf 46.8 \ g \ NH_3}}[/tex]

Explanation:

We are asked to calculate the mass of 2.75 moles of ammonia.

We convert moles to grams using the molar mass or the mass of 1 mole of a substance. These values are equivalent to the atomic masses on the Periodic Table, but the units are grams per mole instead of atomic mass units.

Look up the individual elements in the compound of ammonia: NH₃

Notice that there is a subscript of 3 after H in the chemical formula. There are 3 moles of hydrogen in 1 mole of ammonia. We must multiply hydrogen's molar mass by 3 before adding nitrogen's molar mass.

We convert using dimensional analysis. First, set up a ratio using the molar mass.

[tex]\frac {17.031 \ g \ NH_3}{ 1 \ mol \ NH_3}[/tex]

We are converting 2.75 moles of ammonia to grams, so we multiply the ratio by this value.

[tex]2.75 \ mol \ NH_3 * \frac {17.031 \ g \ NH_3}{ 1 \ mol \ NH_3}[/tex]

The units of moles of ammonia cancel.

[tex]2.75 * \frac {17.031 \ g \ NH_3}{ 1}[/tex]

[tex]46.83525 \ g \ NH_3[/tex]

The original measurement of moles (2.75) has 3 significant figures, so our answer must have the same. For the number we calculated, that is the tenth place. The 3 in the hundredth place tells us to leave the 8 in the tenth place.

[tex]46.8 \ g \ NH_3[/tex]

There are approximately 46.8 grams of ammonia in 2.75 moles of ammonia.

Answer:

Solids, Gasses, Liquids

Explanation:

Solids are rigid structures that have a definite share and volume.

Gasses will continue to spread indefinitely until pressure prevents further spreading.

Liquids have a volume but take the shape of the container they are in.  

Answer:

C is Correct

Explanation:

Protons and Neutrons make up the Nucleus while Electrons surround the nucleus in circular orbits with continuous rotation.

Answer:

If an atom, ion, or molecule is at the lowest possible energy level, it and its electrons are said to be in the ground state. If it is at a higher energy level, it is said to be excited, or any electrons that have higher energy than the ground state are excited

Explanation:

pls mark brainliest

Answer:

Explanation:

i think its b

Answer:

soalan ni yang ni tahun atau tingkatan

Explanation:

They mostly have negative charges

Answer:

mercury

Explanation:

because mercury can get turned into liquid in any normal rrom temperature

Answer:

81 °C

Explanation:

This is a calorimetry question so a few things you will need for this. The calorimetry equation q=mcΔT & the specific heat of water (4.2J/g•°C). Other definitions are:

q = heat added/released by a sample

m = mass of sample

c=specific heat of sample

ΔT = change in temperature

from here we can rearrange the equation to state:

q/(mc) = ΔT

1200J/((20.0g)(4.2J/g•°C)) = ΔT

14°C = ΔT

If the starting temperature was 95.0°C and we know that the temperature was cooled by 14°C then the final temperature of the water would be 81.

Answer:

C. 81 c

Explanation:

took the test :)

Answer:

1.6g/mL

Explanation:

Density equation is D=m/v

Density = g/mL

m=mass of sample in grams

v = volume of sample in mL

The volume of a square can be calculated by V=l*w*h.

In this case it is 5cm*5cm*5cm = 125cm^3

Since we know that 1cm^3 ~ 1mL we can convert the volume to mL as so:

125cm^3 (1mL/(1cm^3)) = 125mL

Then simply plug into the density equation:

D=200g/125mL = 1.6g/mL

Answer:

Increases, higher

Explanation:

Remember that the formula for Density is D=mass/volume.

If volume remains the same, as mass increases the density will also increase as the numerator of this math problem increases while the denominator remains the same.

(a) At constant pressure and volume, the density of a gas increases as the molar mass increases.

(b) A gas made of heavier particles will have a greater density than a gas composed of lighter particles under the same conditions of temperature and pressure.

The relationship between density and molar mass is given in the following equations;

PV = nRT

PV = (m/M) RT

PV = (ρV/M)RT

P = (ρ/M)RT

P = (ρRT)/M

PM = ρRT

where;

Thus, we can conclude that, at constant pressure and volume, the density of a gas increases as the molar mass increases.

A gas made of heavier particles will have a greater density than a gas composed of lighter particles under the same conditions of temperature and pressure.

Learn more about density of gases here: https://brainly.com/question/18992505

Answer:

7 gallons

Explanation:

Just do the math

$21 x 1 gallon/$3 =7 gallon

Answer: mass is the amount of matter in one object or substance

Explanation:

Explanation:

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

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

From the question we have

mass = 144 g

volume = 50 ml

We have

[tex]density = \frac{144}{50} \\ = 2.88[/tex]

We have the final answer as

Hope this helps you

Answer:

Matter always takes space (or has volume).

Answer:

False. Everything that has mass takes up space.

Explanation:

Answer:

If the sugar concentration level of the must becomes too high at any given point--either at the beginning or during the fermentation--it starts to have an inhibiting effect on the yeast's ability to produce alcohol. In other words, the higher sugar concentration starts to act as a preservative effecting the fermentation in a negative way.

Explanation:

Fermentation is the process by which yeast converts the glucose in the wort to ethyl alcohol and carbon dioxide gas -- giving the beer both its alcohol content and its carbonation.

Answer:

I HOPE IT WILL HELP YOU A LOT.

Answer:

technology scientific methods

Answer:

[tex]⚪ \: { \sf{law}}[/tex]

Answer:

8

Explanation:

Electronic configuration of Calcium = 2, 8, 8, 2

M shell = 3rd energy level

Maximum number of shells in m shell is 8

Answer:

Once ignited, a ribbon of magnesium metal burns freely in air to form solid magnesium oxide in the form of a white powder. The reaction is plainly spontaneous even though ΔS is negative.

Answer:

carbon because it is the main answer of these

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graphite is able to conduct electricity because it has delocalised electrons.

explanation:

carbon can bond 4 times, but in graphite it is only bonding to three other carbons, leaving one electron free to carry charge

hope this helps <33

Answer:   The iron will sink and the sulfu will float

Explanation:  The iron/sulfu mixture only mixes the two elements.  Unless one ignites them, they will remain elements and can be separated based on the difference in their densities.

Answer:

A. 1.3 bison/mi^2

Explanation:

4500 bison divided by 3472 sq miles is 1.3 bison per mile squared.