How many grams K₂SO₄ in 394 mL of a 0.650 M K₂SO₄?

Answer:

C

Explanation:

Cyanide's formula can be found either on google on on a reference table at the "polyatomic ions" table. Hydrogen, H, has a charge of 1+ when bonded, and cyanide has a charge of 1- overall, so they will be in a one to one ratio while bonded. As such, the equation is HCN.

Answer:

i) mass of the anhydrous  CuSO₄ = 0.67 g;

Number of moles of anhydrous CuSO₄ present = 0.004 moles

ii) mass of water liberated = 0.38 g;

Number of moles of water liberated = 0.02 moles

iii) simplest mole ratio = 0.02 / 0.004 = 5 : 1

iv) Formula of the hydrate of copper sulfate = CuSO₄.5H₂O

Explanation:

Molar mass of  CuSO₄ = 159.6 g/mol

i) mass of the anhydrous  CuSO₄ = (mass of crucible + compound after 3rd heating) - mass of crucible

= 26.97 g - 26.30 g = 0.67 g

Number of moles of anhydrous CuSO₄ present = mass/molar mass

= 0.67 g / 159.6 g/mol = 0.004 moles

ii) mass of water liberated = (Mass of the crucible + hydrate compound) - (mass of crucible + compound after 3rd heating)

mass of water liberated = 27.35 g - 26.97 g = 0.38 g

Number of moles of water liberated = mass/molar mas

Number of moles of water liberated = 0.38 g/ 18.0 g/mol = 0.02 moles

iii) simplest mole ratio = 0.02 / 0.004 = 5 : 1

iv) Formula of the hydrate of copper sulfate = CuSO₄.5H₂O

Amino acids and proteins are similar to the nucleotides and nucleic acids. Just as proteins are made up of numbers of amino acids, similarly nucleic acids, which include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid), are made from monomers known as nucleotides.

Although they mainly do different functions in the cell, they do have a lot in common.

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Answer:

D: Lithium

Explanation:

Lithium (Li) is less reactive than potassium (K) because the valence electrons in lithium atoms are closer tot he nuclei and harder to remove.

Answer:

c.

Explanation:

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Explanation:

The complete and balanced molecular equation is-

K₂SO₄(aq) + SrI₂(aq) → KI(aq)+ SrSO₄(s)

Both sides of the reaction must have an equal amount of atoms in each element to balance the equation.

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Balanced molecular equation is :

K₂SO₄(aq) + SrI₂(aq) → KI(aq)+ SrSO₄(s)

What is Balanced equation?

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The mass change of the beaker containing a dialysis tubing with 0.8M sucrose, enclosed by a dialysis bag impermeable to sucrose, is due to the movement of water molecules through the dialysis bag.

The sucrose concentration inside the dialysis tubing is higher (0.8M) compared to the sucrose concentration in the beaker (0.1M). This creates an osmotic gradient, where water molecules tend to move from an area of lower solute concentration (the beaker) to an area of higher solute concentration (inside the dialysis tubing).

As water molecules move across the dialysis bag, the beaker experiences a net loss of water, resulting in a decrease in mass. The sucrose molecules, being too large to pass through the impermeable dialysis bag, remain inside the tubing.

This process, known as osmosis, continues until the sucrose concentrations inside and outside the dialysis tubing reach equilibrium. At this point, the mass change of the beaker will stabilize, and no further net movement of water will occur.

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Pretty sure its Physical Changes

No chemical reaction is happening.

Answer:

Changes of states are physical changes

Explanation:

They are reversible changes that do not involve changes in matter's chemical makeup or chemical properties.

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Answer:

B. Brittle

Explanation:

It's a substance that is hard but liable to break or shatter easily.

Brittleness is the quality of objects and materials to break easily, that is, it is the ability of a material to fracture with little deformation.

Brittleness is the mechanical property of a material as opposed to toughness, that is, it is the ease with which a material breaks without causing elastic deformation.

Therefore, we can conclude that brittleness is the ability of some materials to shatter or break, undergoing little deformation.

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The materials comes as It is deposited with sediment grains. (a)

The material used to make cement is composed of minerals found in sedimentary rocks. These sedimentary rocks are formed when sediment grains are deposited in layers and then hardened over time.

These sedimentary rocks can include sand, clay, and minerals such as calcite and gypsum. The sediment grains are the source of the material used to make cement.

The mixture is heated until it forms a paste-like material called clinker. The clinker is then ground into a fine powder, which is the cement we use for construction and other purposes.

So, cement is made from a mixture of these sediment grains, combined with water and other substances such as limestone, iron ore, and aluminum oxide. (a)

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1 mL =\(10^{-3}\) L

so $155$ mL =$155\times10^{-3}$ L

Now, $1$ gallon = $3.785$ L , or $1$ L= $\frac1{3.785}$ gallons

so $155\times10^{-3}$ L= $155\times10^{-3}\times \frac{1}{3.785}=40.95\times 10^{-3}$ gallons

and this is for each day, so just divide by 1 (day) to get the ratw gallons/day

i.e. $40.95\times 10^{-3}$ gal/day

Answer:

4.08

Explanation:

Answer:

1) 70

2) conduction

3) The ground absorbs the solar radiation and

releases it throughout the later afternoon.

4) transpiration

5) convection

6) cumulonimbus

7) reflectivity of Earth’s surface

8) As temperature increases, air pressure

increases.

9) thermosphere

10) convection cells, pressure belts, and the

Coriolis effect

11) radiation

12) pollen

13) scattering

14) thermosphere

15) The different types of clouds are:

cumulus: Cumulus clouds are clouds which have flat bases and are often described as "puffy", "cotton-like" or "fluffy" in appearance. Their name derives from the Latin cumulo-, meaning heap or pile.

cirrus: Cirrus is a genus of atmospheric cloud generally characterized by thin, wispy strands, that typically appear white or light grey. The name is derived from the Latin word cirrus, meaning 'ringlet' or 'curling lock of hair'. Such a cloud can form at any altitude between 5,000 and 13,700 m above sea level.

stratus: Stratus clouds are low-level clouds characterized by horizontal layering with a uniform base, as opposed to convective or cumuliform clouds that are formed by rising thermals.

nimbus: Nimbostratus clouds are dark, grey, featureless layers of cloud, thick enough to block out the Sun and produce persistent rain. Height of base: 2,000 - 10,000 ft. Shape: Bands or areas of individual cells. Latin: nimbus - rainy cloud; stratus - flattened or spread out. Precipitation: Continuous rain or snow likely.

16) the tradewinds

17) the location’s latitude

18) Cirrus clouds

19) the ozone layer

20) Global winds are created by both the spin of

the Earth (Coriolis effect) and the differences

in temperature between the equator and

the polar areas. These winds are often

grouped together as trade winds, easterlies,

and westerlies.

21) nitrogen

22) the Miller-Urey hypothesis

the Oparin-Haldane hypothesis

23) ammonia gas

24) cumulus

25) It determines the mass of water in a volume of air

Explanation:

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Answer:

A.) 12

Explanation:

The number of valence electrons= the group number

Answer:

c) 3 valence elcertons

The Value of x in the hydrate is D. 10.

To find the value of x in the hydrate \(Na_{2}SO_{4}\) * x \(H_{2}O\) , we need to determine the amount of water lost during heating and relate it to the moles of anhydrous \(Na_{2}SO_{4}\) .

First, let's calculate the mass of water lost:

Mass of water = Mass of hydrate - Mass of anhydrous \(Na_{2}SO_{4}\)

Mass of water = 3.22 g - 1.42 g = 1.80 g

Next, we'll convert the mass of anhydrous and water to moles using their respective molar masses ( \(Na_{2}SO_{4}\)= 142 g/mol, \(H_{2}O\) = 18 g/mol):

Moles of \(Na_{2}SO_{4}\)= 1.42 g / 142 g/mol ≈ 0.0100 mol

Moles of  \(H_{2}O\)= 1.80 g / 18 g/mol = 0.1 mol

Now, we'll find the ratio of moles of water to moles of \(Na_{2}SO_{4}\):

x = Moles of \(H_{2}O\) / Moles of \(Na_{2}SO_{4}\)

x ≈ 0.1 mol / 0.0100 mol = 10

The value of x in the hydrate \(Na_{2}SO_{4}\) * x \(H_{2}O\) is approximately 10. Therefore, the correct answer is D. 10.

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To prevent mixing up, the food worker must carefully mark the spray bottle with what is inside to assure that accident hapen.

Since chemicals are dangerous, it is best top store them in their own special location and to stay away from sanitizing chemicals when preparing food to prevent contamination.

Chemicals labels must be included on all substances that are poisonous, oxidizing, corrosive, reactive, carcinogenic, or flammable, as well as any liquids or gases that are under pressure, such as liquid nitrogen tanks and compressed air cylinders.

Chemicals should also never be kept close to food or surfaces that come into contact with it. To prevent cross-contamination, the chemical storage space for food workers needs to be isolated from the food storage area. Chemical spills into food are relatively simple to happen if they are stored close to locations where food is prepared.

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burning of wood logs and paper. food digestion. egg being boiled. utilisation of chemical batteries. metal electroplating cake baking milk turning bad. Multiple metabolic processes take place inside cells.

A few examples of chemical changes include the production of carbon dioxide by baking soda and vinegar, iron rusting, and wood burning. Among the numerous chemical reactions that the body performs are the metabolization of meals and the creation of amylase from the blending of sugar and saliva.

Chemical transformations are also referred to as chemical reactions. Our lives are significantly impacted by chemical changes. Each new compound is created as a result of chemical reactions. As an illustration, a series of chemical changes result in food digestion in human bodies, fruit ripening, grape fermentation, etc..

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The two ways the cathode ray tube experiment changed scientists'

understanding of the atom was it showing that atoms can be divided into

smaller parts and all atoms contain electrons.

J.J Thompson was the scientist which performed the cathode ray tube

experiment and was able to ascertain it was negatively charged as a result

of it being deflected to the positive electrode.

His observation showed that the atoms contain sub-atomic particles called

electrons which are negatively charged.

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Answer: .5

Explanation:

The dilution of less than 6% of hydrogen peroxide would not be considered a broad spectrum and sporicidal disinfectant. Dilution of>15 % is considered to be suitable concentration for sporicidal disinfectant.

Hydrogen peroxide, H₂O₂  is covalent compound formed by the combination of hydrogen and oxygen atoms. It is an oxidizing agent and have a significant industrial value due its disinfectant property.

A 30% aqueous solution of hydrogen peroxide can be bought and diluted to a usable solution. However, it should be noted that hydrogen peroxide alone in diluted solutions of less than 6% is a slow and ineffective germicide.

Hydrogen peroxide works well against bacteria, viruses, and fungi and is sporicidal at higher doses (>15%). Its effectiveness against mycobacteria is weak. The work surfaces of biosafety cabinets and laboratory benches can be cleaned with hydrogen peroxide.

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pH of the resulting hydrochloric acid solution is 2.74.

To find the pH of a solution, we need to know the concentration of H+ ions in it.

We can use the equation

pH = -log[H+]

to calculate the pH of the solution given the concentration of H+ ions.

Here's how we can solve the problem:

Step 1: Find the moles of HCl in the solution.

The molar mass of HCl is 36.5 g/mol.

Mass of HCl = 0.30 g

Moles of HCl = mass/molar mass= 0.30/36.5= 0.00822 mol

Step 2: Find the concentration of H+ ions in the solution.

HCl is a strong acid, which means that it dissociates completely in water to give H+ and Cl- ions.

HCl → H+ + Cl-

So, the concentration of H+ ions in the solution is equal to the concentration of HCl, which is given by:

C = n/V = 0.00822 mol/4.5 L = 0.00183 mol/L

Step 3: Find the pH of the solution.

pH = -log[H+]

pH = -log(0.00183)

pH = 2.74

Therefore, the pH of the resulting hydrochloric acid solution is 2.74.

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One mole of each element contains Avogadro's number of atoms, which is 6.022 x 10^23 atoms. Therefore, all three substances have the same number of atoms, which is 6.022 x 10^23 atoms.

Answer:

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Explanation:

Answer: Aluminum is ideal for aircraft manufacture because it's lightweight and strong.

Explanation:

Answer:

interaction involving a hydrogen atom located between a pair of other atoms having a high affinity for electrons

Explanation:

According to the data in the table, one effect of injecting vitamin B into the chicken eggs is that it increases the number of eggs hatching on the 21st day. The correct option is 3.

Vitamin B supports the functions of several enzymes, including those that release energy from fat and carbohydrates, break down amino acids, and transport oxygen and nutrients that contain energy throughout the body.

At hatching, the 21st day's hatchlings were all weighed and measured. So, by vitamin B, the number of eggs hatching will increase.

Therefore, the correct option is 3) increase the number of eggs hatching on the 21st day.

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The question is incomplete. Your most probably complete question is given below:

In an experiment using chicken eggs, 100 fertilized eggs

were injected with a saline (salt) solution containing vitamin B

during day 1 of their incubation period. At the same time, a

second group of 100 fertilized eggs was injected with a plain

saline solution. All the chicks that hatched on the 21st day

were weighed and measured at hatching. The results are

recorded in the data table below.

According to the data in the table, one effect of injecting

vitamin B into chicken eggs is that it:

1) changes the amount of yolk stored in the egg

2) produces larger eggs

3) increases the number of eggs hatching on the 21st

day

4) increases the incubation period

Answer:

The answer is freezing (Option B)

Explanation:

To begin with, it is important to note that lava flowing from Hawaiian volcanoes are not sticky but very runny. They cool down or freeze after flowing a long way.

Since the lava is not sticky (because it is not thick), it means they are thin and prone to freezing or cooling immediately when the flow stops. Upon freezing, the lava forms crystal rocks (shiny in texture and gray in color) that are not big.