A substance with two or more different types of atoms chemically bonded together is called....

a. an element
b. an atom
c. a mixture
d. a compound

Answer:

Pupil, Cornea, Retina, and Lens

Explanation:

Answer:

5

Explanation:

Answer:

The hydrogens of the water molecules around the bromide ion will need to be faced toward it, whereas the oxygens of the water molecules around the potassium ion will need to be faced toward it.

The strength of the interaction within the compound will supersede that of the interaction between the compound and water.

Explanation:

To answer this question, you need to be aware of the structure of a water molecule and its components. A water molecule has the chemical formula of H2O, and oxygen is inherently electronegative, meaning that it attracts electrons very strongly. As a result, when it is in H2O, it pulls the valence electrons of the H atoms very strongly, which results  in the H atoms being partially positively charged and the O atom being partially negatively charged. Therefore, the O atom is going to be attracted to the potassium ion, whereas the H atom is going to be attracted to the bromide ion.

The answer to the second part of the question is as written above because ionic bonds are stronger than ion-dipole bonds; that's just the way it is.  

Answer:

% m/m = 16.6%

% m/v = 20%

3.42 m (molalidad)

3.42 M (molaridad)

Fraccion molar del soluto = 0.06

Fraccion molar del solvente = 0.94

Explanation:

Nuestra solución está compuesta por:

Soluto: 50 g de sal

Solvente: 250 mL de agua.

%m/m %m/v molalidad, molaridad, fracción molar del soluto y del solvente son distintas formas de definir la concentración:

% m/m son los gramos de soluto cada 100 g de solución.

No sabemos la masa de solución pero con la densidad del agua (solvente), sabemos que los 250 mL contienen 250 gramos de solvente. (Densidad del agua 1g/mL). En conclusión, la masa de solución es 50 g + 250g = 300

% m/m = (50g /300g ) . 100 = 16.6%

Vamos a definir que el volumen de la solución es igual al del solvente: 250 mL.

% m/v = la masa de soluto, cada 100 mL de solución

= (50 /250) . 100 = 20 %

Molalidad, son los moles de soluto por cada kg de solvente.

Convertimos gramos a kg → 250 g . 1kg /1000g = 0.25kg

Convertimos la masa de soluto (sal) a moles.

NaCl → 50 g . 1mol/ 58.45g = 0.855 moles

m = 0.855 /0.25 → 3.42 m (molalidad)

Molaridad son los moles de soluto por cada L de solución.

Convertimos mL a L → 250 mL . 1kg / 1000mL = 0.25 L

sabiendo que los moles de soluto son 0.855, en este caso la molaridad es igual a la molalidad ( 3.42 M)

Para calcular la fracción molar, necesitamos moles de soluto y de solvente.

Ya contamos con los moles de soluto.

Moles de solvente: 250 g . 1mol /18g = 13.89 mol

Moles totales = 0.855 + 13.89 = 14.745

Fracion molar del soluto: (0.855/ 14.745) = 0.06

Fraccion molar del solvente: (13.89 / 14.745) = 0.94

Answer:

74.04 liters of hydrogen gas are produced.

Explanation: According to reaction, 2 mol of HCl gas gives 1 mole of hydrogen gas, then 6 moles of HCl gas will give: moles of hydrogen gas that is 3 moles.

The pressure of the hydrogen gas at 298 K = 0.990 atm

The volume occupied by the hydrogen gas = V

Number of hydrogen has moles = 3 moles

PV=nRT

V = 74.04 L

74.04 liters of hydrogen gas are produced.

Answer:

38.2 liters Is the answer

Explanation:

Answer:

Extractive metallurgy

Explanation:

Extractive metallurgy is the practice of removing valuable metals from an ore and refining the extracted raw metals into a purer form.

Answer:

“Newton’s Law of Gravity” gives the gravity force between two objects with masses m

and M separated by distance r:



F  G

m M

r

2

G is called the Gravitational Constant, and has the value



6.671011N m

2

kg2

(N is for

Newton, the physicists’ unit of force) or



1.51011 lbm

2

kg2

.

Let’s go back to the example given in the text: two 150 lb people separated by 1 meter.

The mass of each person is



150lb

2.2

lb

kg

 68kg

. Putting these into the formula gives



F 1.5101 1 lb m

2

kg2



(68kg)

2

(1m)

2

107

lb.

Newton’s Law of Gravity actually gives the force only between two small objects. If one

of the objects is a sphere (such as the Earth) then it turns out that you can still use the

formula, but you must use the distance to the center of the sphere as the value for r. As

an example, let’s put in numbers for a 1 kg object sitting on the surface of the Earth.

Then the force of attraction is given by the gravity equation with m = 1 kg, M = the mass

of the Earth =

24 610

kg, and r = radius of the Earth (that’s the distance to the center of

the sphere). This distance is r = 6371 km ≈

6

610

meters. Without plugging in the

numbers, can you guess what the answer will turn out to be? Guess, and then check this

footnote2

to see if you guessed correctly.

Suppose you weigh 150 lbs on the Earth. Then your mass is



150lb

2.2

lb

kg

 68kg

. What will

you weigh on the Moon? We can calculate that by using Newton’s Law of Gravity, and

putting in the M = the mass of the Moon =

22 7.310

kg, r = the radius of the moon =

6

1.710

meters. The answer is F = 25 lb. That means you will weigh 25 lb. on the

surface of the Moon.

Explanation:

hope this helps :)

Answer:

evaporation and condesation

Explanation:

because he was curiuos

Answer:

[H⁺] = 5.754 x 10^-13 M

Explanation:

Since pH is the negative log of the hydronium concentration, we can solve for hydronium concentration and then plug in our given pH:

pH = -log[H⁺]

-pH = log[H⁺]

10^-pH = [H⁺]

Let's plug in our pH:

[H⁺] = 10^-pH = 10^-12.24 = 5.754 x 10^-13 M

Answer:

Because it can cause health problems or injuries to our sense organs.

Explanation:

Chemicals in the laboratory are made up of different constituents, which may be dangerous or injurious to health. This is the reason why safety measures or precautions have to be taken when working in the laboratory. One of those safety measures is that "one should never use taste, touch, or smell to identify an unknown chemical".

This is so because a chemical that is unknown amounts to the fact that what such chemical contains is unknown, hence, the chemical might have the ability to cause harm or injuries to the sense organ. For example, a conc. acid that is tasted will burn the tongue etc.

Answer:

The temperature at 760mmHg if the volume is still 4.2 L is 400.862 K

Explanation:

Gay Lussac's law indicates that when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases. This law can be expressed mathematically as follows:

[tex]\frac{P}{T} =k[/tex]

Having an initial state 1 and a final state 2, the following is true:

[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]

In this case:

Replacing:

[tex]\frac{560 mmHg}{295.372 K} =\frac{760 mmHg}{T2}[/tex]

Solving:

[tex]T2= 760 mmHg*\frac{295.372 K}{560 mmHg}[/tex]

T2= 400.862 K

Answer:

2 CH4O + 3 O2 = 2 CO2 + 4 H2O

Answer:

Disturbance

Explanation:

I believe it is Disturbance because waves are normally caused by wind, and wind classifies as Disturbance.

Answer:

The Independent Variable is what we change or control in the experiment. The Dependent Variable is what we are testing and will be measured in the experiment. The Control Variables are what we keep the same during the experiment to make sure it's a fair test. hope this helps =)

Explanation:

Answer:

52/13

Explanation:

13X=30+22

x=52/13

Answer:

(B) Grasses to Grasshoppers to Birds to Foxes

Explanation

Answer:

thats the ans.

https://socratic.org/questions/a-gas-occupies-900-0-ml-at-a-temperature-of-27-0-c-what-is-the-volume-at-132-0-c

Explanation:

Carbon Dioxide

A positive test will result in the lime water turning milky. Lime water turns milky as the Calcium hydroxide (chemical name for limewater) reacts with carbon dioxide to form Calcium Carbonate which is insoluble in water and thus forms a milky white precipitate.

Answer:

algun moderador puede acabar a este otro este me borró respuesta que no debió borrar

Answer:

Cattles are giving nutrition supply throughout the year----some animals require nutrient enhancement for health

calves are given colostrum at birth----newborns require antibodies from their mothers

I dont want to write, so you know what the last option is

Explanation:

:) hope this helps

Because deserts have such little water vapor in the air, it makes it harder to trap heat or cold in a desert. And at night, the sun no longer heats the desert and the heat from the day doesn't stay trapped. Because of this, some deserts can get extremely cold at night, dropping to temperatures below 40F.

Hope this helps!! Have a wonderful day!!

It is actually sand, which turns the entire phenomenon hot. Sand cannot hold the heat. It acts like a mirror to the sun. During the daytime, it stays warm, and when the Sun is absent it loses all its heat making the nights colder. There’s nothing in the desert that can either absorb heat from the sun or hold it on the surface when the sun is set.

Answer:

ujdbdbfbf fbFbsygtsjysnsgndhngsnsgnafbfa

Answer:

a.) exothermic

b.) 2,800.6 J

Explanation:

Answer:

15moles

Explanation:

The balanced equation of this reaction is as follows:

N2 + 3H2 → 2NH3

Molar mass of H2 = 2g/mol

mole = mass/molar mass

mole = 90/2

mole = 45moles.

Based on the above balanced equation, 1 mole of nitrogen gas (N2) reacts with 3 moles of hydrogen gas (H2)

Hence, 45moles of hydrogen gas will produce (45 × ⅓) = 15moles of nitrogen gas (N2).

Answer:

Its 14.9 for those who are doing the escape room :)

Explanation:

Answer:

I don't know

Explanation:

hindi ko alam

Answer:

Prejudice

Explanation:

Answer: your answer would be prejudice.