Which of the statements about atoms are true?

1. All matter is made of atoms.
2. Air is between atoms in substances
3. There is nothing between atoms in a gas.
4. Living organisms are made of atoms.

Select all that apply.

Answer:

the answer is b

hope this helps :)

please crown me brainliest!!!!

Answer: Heat energy contained by water is 130.625 J.

Explanation:

Given: Mass = 1.25 g

Specific heat = [tex]4.18 J/g^{o}C[/tex]

Initial temperature = [tex]20.0^{o}C[/tex]

Final temperature = [tex]45.0^{o}C[/tex]

Formula used to calculate heat energy is as follows.

[tex]q = m \times C \times (T_{2} - T_{1})[/tex]

where,

q = heat energy

m = mass of substance

[tex]T_{1}[/tex] = initial temperature

[tex]T_{2}[/tex] = final temperature

Substitute the values into above formula as follows.

[tex]q = m \times C \times (T_{2} - T_{1})\\= 1.25 g \times 4.18 J/g^{o}C \times (45.0 - 20.0)^{o}C\\= 130.625 J[/tex]

Thus, we can conclude that heat energy contained by water is 130.625 J.

Metals wish to lose valence electrons and nonmetals wish to gain valence electrons.

Explanation:

Mathematically, Ohm's law is given by :

V = IR

Where

V is voltage

I is current

R is resistance

The electric power of an electrical appliance is given by:

P = VI

Wattage = VI

Resistance, [tex]R=\dfrac{V}{I}[/tex]

Current, [tex]I=\dfrac{V}{R}[/tex]

Hence, this is the required solution.

Answer:

2.4 mol x 22.4 liter = 53.76 liters

1 mole

Explanation:

The volume of a container that holds 2.4 mol of gas at STP is 53.76L

STP stands for standard temperature and pressure. STP refers to a specific pressure and temperature used to report on the properties of matter.

According to IUPAC( International Union of Pure and Applied Chemistry), it is defined as -

It is generally needed to test and compare physical and chemical processes where temperature and pressure plays an important role as they keep on varying from one place to another.

One mole of a gas under STP conditions occupies a volume of 22.4L.

Given,

Moles of gas = 2.4 moles

1 mole of a gas at STP occupies 22.4 L of volume

2.4 moles will occupy = 2.4 × 22.4

                                   = 53.76 L

Therefore, the volume of a container that holds 2.4 mol of gas at STP is 53.76L

Learn more about STP, here:

https://brainly.com/question/24050436

#SPJ2

78000 J

Chemistry

Thermodynamics

Specific Heat Formula: q = mcΔT

Math

Pre-Algebra

Order of Operations: BPEMDAS

Step 1: Define

Identify variables

[Given] m = 75 g

[Given] c = 4.184 J/g °C

[Given] ΔT = 235 °C - -15°C = 250 °C

[Solve] q

Step 2: Solve for q

Step 3: Check

Follow sig fig rules and round. We are given 2 sig figs as our lowest.

78450 J ≈ 78000 J

Answer:

5 g

Explanation:

The heat required to vaporize ice is the sum of

i) Heat required to melt ice at 0°C

ii) Heat required to raise the temperature from  0°C to 100°C

iii) Heat required to vaporize water at 100°C

Thus;

H = nLfus + ncθ + nLvap

H= n(Lfus + cθ + Lvap)

Lfus = 6.01 kJ/mol

Lvap = 41 kJ/mol

c = 75.38

n =?

2100 = n(6.01  + 75.38(100) + 41)

n = 2100 KJ/7585.01 kJ/mol

n = 0.277 moles

Mass of water = number of moles * molar mass

Mass of water = 0.277 moles * 18 g/mol

Mass of water =  5 g

Answer: rain

Explanation:

Answer:

(ii) 1 dye

(iii) Food coloring F is insoluble in the solvent

(iv) 'E' and 'H'

(b) Food colouring G

Explanation:

Paper chromatography principle is based on the rates of migration of chemicals across a sheet of paper which are different and it consists of a stationary phase such as the water in the paper and a mobile phase such as the solvent resulting in the partitioning of the components of the mixture across the paper

The solution components are positioned to start in one place from where they migrate and separate out on the chromatography paper

(ii) The number of components into which the food colouring 'H' separates into = 1

Therefore, the number of dyes in food colouring 'H' = 1 dye

(iii) Food coloring 'F' does not move because it is insoluble in the solvent, which is the mobile phase

(iv) The food colouring that contains the dye that is likely to be most soluble in the solvent are does for which the dyes travel furthest, which are;

Food coloring 'E' and 'H'

(b) Using a similar question solution found on 'tutor my self' website, we have;

The [tex]R_f[/tex] values are given as follows;

[tex]R_f = \dfrac{Distance \ moved \ by \ dye}{Distance \ moved \ by \ solvent}[/tex]

The distance moved by the solvent = 5 units

The distance moved by dyes in food colouring 'E' and 'H' = 4 units

The distance moved by dye in food colouring 'G' = 3.3 units

The distance moved by the second dye in food colouring 'E' = 2.7 units

By inspection, we get;

[tex]R_f[/tex] dye in food colouring 'G' = 3.3/5 = 0.66,

Therefore, the dye with [tex]R_f[/tex] value closest to 0.67 is the dye in food colouring 'G'.

Answer:

The oxidation state of carbon in CaC204 is 3

Answer:

There are 3 elements, Sodium, Carbon, and oxygen. There are 2 Sodium atoms 2*2=4, one carbon, and 3 Oxygen so 4+1+3=8 total atoms. one compound CO3  

Explanation:

that's all I know

Answer:

[tex]\boxed {\boxed {\sf 4.6 \ Liters}}[/tex]

Explanation:

The pressure stays constant, so we are dealing with volume and temperature, so we use Charles's Law. This states the temperature and volume of a gas are directly proportional. The formula is:

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

We know the original balloon has a volume of 1.25 liters at a temperature of 23 degrees celsius. These values can be substituted in.

[tex]\frac{1.25 \ L}{23 \textdegree C}=\frac{V_2}{T_2}[/tex]

The new volume is unknown, but the temperature is increased to 85 degrees Celsius.

[tex]\frac{1.25 \ L}{23 \textdegree C}=\frac{V_2}{85 \textdegree C}[/tex]

We are trying to solve for the new volume, V₂. It is being divided by 85 degrees Celsius. The inverse of division is multiplication, so we multiply both sides by 85°C.

[tex]85 \textdegree C*\frac{1.25 \ L}{23 \textdegree C}=\frac{V_2}{85 \textdegree C}*85 \textdegree C[/tex]

[tex]85 \textdegree C*\frac{1.25 \ L}{23 \textdegree C}= V_2[/tex]

The units of degrees Celsius cancel.

[tex]85 *\frac{1.25 \ L}{23} = V_2[/tex]

[tex]4.61956522 \ L = V_2[/tex]

The original measurements have at least 2 significant figures, so our answer must have 2. For the number we found, that is the tenth place.

The 1 in the hundredth place (in bold above) tells us to leave the 6 in the tenth place.

[tex]4.6 \ L \approx V_2[/tex]

The new volume of the balloon is approximately 4.6 liters.

Answer:

Im pretty sure you use mass

Explanation:

Answer:

Los químicos eligen definir la AMU como 1/16 de la masa promedio de un átomo de oxígeno que se encuentra en la naturaleza; es decir, el promedio de las masas de los isótopos conocidos, ponderado por su abundancia natural. Los físicos, por otro lado, lo definieron como 1/16 de la masa de un átomo del isótopo oxígeno-16 (16O).

Answer:

where is the answer??

Please do not just take the points without answering the question.

Answer:

Neutrons released during a fission reaction cause other nuclei to split

Answer:

B: Neutrons released during a fission reaction cause other nuclei to split

Explanation:

Answer:

It's in the Orion Arm which I think is letter D on your diagram

Explanation:

I hope this helped

I believe that the answer is A.

The combination of potassium (K) and oxygen (O2) produces K2O (potassium oxide). The balanced equation is 2K + O2 ==> K2O.

Answer: Pressure of the gas in the tank is 9.8 atm.

Explanation:

Given: Moles = 2.0 moles,     Volume = 5.0 L

Temperature = [tex]25^{o}C = (25 + 273) K = 298 K[/tex]

Formula used to calculate pressure is as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

[tex]PV = nRT\\P \times 5.0 L = 2.0 mol \times 0.0821 L atm/mol K \times 298 K\\P = \frac{2.0 mol \times 0.0821 L atm/mol K \times 298 K}{5.0 L}\\= 9.8 atm[/tex]

Thus, we can conclude that pressure of the gas in the tank is 9.8 atm.

Answer:

water is liquid state of matter

Answer:

O Ca(OH)2

Explanation:

According to Arrhenius definition of a base, it is a substance that dissociates in water to form hydroxide ions (OH-). This means that in the neutralization reaction between calcium hydroxide and sulfuric acid as described in this question, calcium hydroxide is the base because it contains the hydroxide ion (OH-).

Calcium hydroxide is a combination of calcium (Ca2+) as the cation and hydroxide (OH-) as the anion. Hence, the chemical formula will be Ca(OH)2.

the answer would be 150 m because you just add 60 and 90

Answer: What is the mass of disulfur pentoxide (S2O5)?

Explanation:144.14g/mol

Explanation:

The molar mass of the compounds are incorrect

Answer:

left = HCl

Middle = NH3

Right = water

Explanation:

HCl is a strong acid so it will have the strongest effect

NH3 is a weak acid so it will have a small effect

Water has no effect

Answer:

136L

Explanation:

p1v1=p2v2

114 x44.0=37.0x V2

V2=136L