Question 30 (10 points) All unauthorized experiments are prohibited . O True False​

Answer:

Explanation:

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Answer:

The key difference between rhombic and monoclinic sulphur is that the rhombic sulphur is the most stable allotropic form of sulphur that exists as rhombic octahedral crystals whereas the monoclinic sulphur exists as long, needle-shape prisms but, it is stable only at temperatures between 96◦C and 119◦C.

Explanation:

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Answer:Which of the following can be formed by physically combining pure substances?a. an element c. a compound b. a mixture d. all of the above Weegy: It is true.The formula for Density is Mass divided Volume.

Explanation:

Answer:

It is B. a mixture

Explanation:

A is wrong because an element is part of a compound and can't be physically mixed, C is wrong because atm don't jin by just physically mixing then there must be a change in smething at the physical level

also correct on edg.

Answer:

1. The warming climate has dried out California's landscape, turning it into a tinderbox. ... This is due in part to climate change: rising temperatures, have an exponential impact when it comes to setting the stage for catastrophic wildfires,

2. Due to the heat and temperature of the place and if the place is very dry.

3. It all depends on the weather. At times there can be less rain whereas at time there is a lot of rain or how much heat it is outside within years

4. Well California is really hot during the summer and it becomes really dry so that is the reason forest fires are getting worse

Answer:

Water boils - physical change

Salt dissolves in water- chemical change

Milk turns sour- chemical change

metal rusts - chemical change

Explanation:

A chemical change refers to changes that are irreversible and the process involves the evolution of heat along with the formation of a new substance, examples include;Salt dissolves in water, Milk turns sour, metal rusts etc

The boiling of water is a physical change. The water can be cooled and the vapour condensed,hence, the boiling of water is a physical change.

Physical changes are easily reversible and no new substance is formed.

Answer :

[tex]Al(OH)_3(aq)+K_3PO_3(aq)\rightarrow AlPO_3(s)+3KOH(aq)[/tex]

[tex]Al^{3+}(aq)+3OH^{-}(aq)+3K^{+}(aq)+PO_3^{3-}(aq)\rightarrow AlPO_3(s)+2K^+(aq)+3OH^{-}(aq)[/tex]

[tex]Al^{3+}(aq)+PO_3^{3-}(aq)\rightarrow AlPO_3(s)[/tex]

Explanation :

In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

The complete balanced equation will be,

[tex]Al(OH)_3(aq)+K_3PO_3(aq)\rightarrow AlPO_3(s)+3KOH(aq)[/tex]

The complete ionic equation in separated aqueous solution will be,

[tex]Al^{3+}(aq)+3OH^{-}(aq)+3K^{+}(aq)+PO_3^{3-}(aq)\rightarrow AlPO_3(s)+2K^+(aq)+3OH^{-}(aq)[/tex]

In this equation, [tex]K^+\text{ and }OH^-[/tex] are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

[tex]Al^{3+}(aq)+PO_3^{3-}(aq)\rightarrow AlPO_3(s)[/tex]

Explanation:

Hey there!!

The differences between them are:

Hope it helps....

Answer:

Explanation:

In the equilibrium:

CO(g) + H₂O(g) ⇄ CO₂(g) + H₂(g)

Kc is:

Kc = 1.845 = [CO₂] [H₂] / [CO] [H₂O]

Where [] are equilibrium concentrations of each species

Initial concentrations:

[CO] = 0.500mol / 1.00L = 0.500M

[H₂O] = 0.500mol / 1.00L = 0.500M

In equilibrium, concentrations will be:

[CO] = 0.500M - X

[H₂O] = 0.500M - X

[CO₂] = X

[H₂] = X

Where X is reaction coordinate. The amount of reactant that reacts producing products.

Replacing in Kc expression:

1.845 = [CO₂] [H₂] / [CO] [H₂O]

1.845 = [X] [X] / [0.500M - X] [0.500M - X]

1.845 = X² / X² - X + 0.25

1.845X² - 1.845X + 0.46125 = X²

0.845X² - 1.845X + 0.46125 = 0

Solving for X:

X = 0.288M; Right solution

X = 1.9M; False solution: Produce negative concentrations.

Replacing, equilibrium concentrations are:

[CO] = 0.500M - X = 0.212M

[H₂O] = 0.500M - X = 0.212M

[CO₂] = X = 0.288M

[H₂] = X = 0.288M

Answer:

b

Explanation:

Note that : Hypothesis can be regarded as proposed explanation needed for a phenomenon.

The steps involves in scientific method are:

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Answer:

308,4796 g.

Explanation:

1 mol equals to 107,86 g, now times 2,86 mol, 308,4796 g.

Answer:

1.4 x 10^-5 dm

Explanation:

Centimeters (cm) and decimeters (dm) are interconvertible S.I units of length.

- A centimeter is one-hundredth of a meter i.e. 100cm = 1m

- A decimeter is one-tenth of a metre i.e. 10dm = 1m

Based on this, a centimeter is one-tenth of a decimeter i.e. 1dm = 10cm

Hence, to convert 1.4 x 10^-4 cm to dm, we divide the value by 10

= 1.4 x 10^-4 ÷ 10

= 0.00014 ÷ 10

= 0.000014

Convert back to scientific notation by counting the decimal point forward to have: 1.4 x 10^-5

Hence, 1.4 x 10^-4 cm is equivalent to 1.4 x 10^-5 dm.

Answer: Remove the watch and watchband immediately, and rinse his wrist for at least 15 minutes to be sure all hazardous material has been washed away. Let the TA inspect his wrist to see if it is okay.

Explanation:

The question is incomplete, the choices are:

a. Take him to the safety shower, and make sure he stands under it for at least 15 minutes to be sure all hazardous material has been washed away. b. Remove the watch and watchband immediately, and rinse his wrist for at least 15 minutes to be sure all hazardous material has been washed away. c. Let the TA inspect his wrist to see if it is okay.

d. Rinse the watch band before allowing him to put it back on.

An acid is traditionally considered to be any chemical compound that, when dissolved in water, produces a solution with greater hydronium cation activity than pure water, i.e., a pH less than 7. Both corrosive acids (and also corrosive bases) are capable of destroying skin by catalyzing the hydrolysis of fats, which are chemically esters. Also, when acids attack metals, hydrogen gas is often released.

This is why your lab partner should remove the watch and watchband immediately, and rinse his wrist for at least 15 minutes to be sure all hazardous material has been washed away. This ensures that the acid is can not damage the skin. And also the person should make sure that someone qualified checks it to see if it is okay.

Answer:

mass of substance =50.4 g

Explanation:

Using the density formula;

Density = mass of substance / volume of substance

Therefore, making mass subject of the density formula,

mass of substance = volume of substance / density of substance

volume  of substance = 60.5 mL, density = 1.20 g/mL ( since common units of density is either g/cm³ or g/mL)

mass of the substance = 60.5 mL / 1.20 g/mL

mass of substance = 50.4 g

Answer:

For numbers less than 1, the power of 10 in scientific notation has negative exponent and for numbers greater than 1, the power is either zero or has positive exponent. Explanation of Solution The given number is 2891, to write the scientific notation, decimal should be placed after first non-zero digit.

Explanation:

Answer:

This question is incomplete because of the absence of the diagram

Explanation:

The absence of the diagram makes the question incomplete, but it appears as if the content of the diagram has been described in the question (which is not totally clear).

The description provided in the question suggests the loss of a water during the formation of a triglyceride. This process described here is called dehydration synthesis. Dehydration synthesis is the process of joining two substances/compounds together leading to the loss of water molecule in the process.

From the explanation above, the correct option is 2. The fat molecule being formed is the triglyceride (through the process of dehydration synthesis).

Answer:

[tex]d=8.817\times 10^9\ mm[/tex]

Explanation:

It is given that,

Japan is 8817.6 km from California. We need to convert this distance in millimeters.

We know the conversion from km to mm is as follows :

1 km = 1000000

To convert mm km to mm use the unitary method as follows :

8817.6 km = 8817.6 × 1000000

[tex]d=8.817\times 10^9\ mm[/tex]

Hence, the distance between Japan and California [tex]8.817\times 10^9\ mm[/tex].

Answer:

The ancient Greeks believed that fire was one the four basic elements that composed all things in the universe. In the mythology of virtually every culture, fire is a sacred substance that gives life or power. Fire is not, in fact, a substance. When you gaze at the leaping flames of a campfire, you’re observing not an object, but a process – a chemical reaction. It’s the same chemical reaction that occurs when a cut apple left on the counter turns brown, when silver tarnishes or when an iron nail rusts.

That process is oxidation: combining oxygen with another substance. The defining difference between a fire and your half-eaten apple is speed: fire is an oxidation process that happens very fast, so that light, heat and sound are released — often with enough force and majesty to justify the ancients’ reverence.The sudden release of energy causes temperatures to rise, sometimes by thousands of degrees. And it also results in smoke, the toxic waste of fire’s leftovers.

The fire triangle and the fire tetrahedron

Fire TetrahedronThe fire triangle identifies the three needed components of fire:

fuel (something that will burn)

heat (enough to make the fuel burn)

and air (oxygen)

Explanation: i hope this helps sry its long

Explanation:

Above we have simply looked the condition that where we put decimal point that gives your needed answer after round off.

For example:

we have to make 2 s.f from 345 so we kept decimal after 3 and we rounded off to make 3.5 from 3.45

Hope you got it

Answer:

B. 6.35 x 10^4 g

Explanation:

Quantities such as mass have more than units that are interconvertible. Mass can be measured in kilograms (kg), grams (g), etc.

However, 1kg equals 1000grams

Hence, a measurement of 6.35 x 10^1 kg will be equivalent to grams (g) by multiplying by 1000units

That is, 6.35 × 10^1 × 1000

= 6.35 × 10^1 × 10^3

Multiplication in index means to add the powers

= 6.35 × 10^ (1+3)

= 6.35 × 10^4grams

Therefore, an equivalent measurement of 6.35×10^1 kg is 6.35×10^4 g.

Answer:

-76

296

228

603

485

Explanation:

Subtract 273 to 200 to get -76

add 273 to 23 to get 296

add 273 to -45 to get 228

subtract 273 to 876 to get 603

add 273 to 212 to get 485

Answer

1. Magnifier glass.

2. Ruler.

3. Scale.

Explanation:

1. To look and enspect the fish egg's.

2. To see how long and tall the fish egg's are.

3. To weight how heavey the fish egg's are.

Magnifier glass, scale, and ruler tools would a scientist use to study fish eggs  

 To look and inspect the fish egg's scientists will use the magnifier glass . To see how long and tall the fish's eggs are, scientists will use scale. To measure the weight of the fish eggs, scientists will use a ruler.

Hence, Magnifier glass, scale, and ruler tools would a scientist use to study fish eggs.

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Answer:

B

Explanation:

landforms.....this is it

Answer:

It could be because of a physical change.

Explanation:

A physical change affects a substance's physical properties, and a chemical change affects its chemical properties.

Answer:

Chemistry deals with compounds, both organic and inorganic, and agriculture deals with the production of organic products using both organic and inorganic inputs Thus Chemistry forms an integral part of agriculture from molecular to organ level.

Explanation:

i hope this helps you! Have a nice day <33

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Explanation:

Answer:

Moving Across a Period

Moving from left to right across a period, the atomic radius decreases. The nucleus of the atom gains protons moving from left to right, increasing the positive charge of the nucleus and increasing the attractive force of the nucleus upon the electrons

Answer:

The symbol is the right answer.

Explanation:

The “ Symbol” is the correct answer because chemist uses the letters of the alphabet to denote the element. For instance, the element oxygen is denoted by the letter of the alphabet “O”, the hydrogen is denoted by the letter of alphabet “H”, Boron is denoted by the letter of alphabet “B”, etc. Here these are the examples that use one letter but there are other elements that use more than 1 letter as the symbol. For example, the Chlorine is represented by the Cl.

The letters of the alphabet are used by chemists as symbols in chemistry.

The “ Symbol” is the correct answer because the chemist uses the letters of the alphabet to denote the element. For instance, the element sulfur is denoted by the letter of the alphabet “S”, the hydrogen is denoted by the letter of the alphabet “H”. Other elements that use more than 1 letter as the symbol. For example, Chlorine is represented by the Cl.

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Answer:

Examples of extended structures could include sodium chloride or diamonds. Examples of molecular-level models could include drawings, 3D ball and stick structures, or computer representations showing different molecules with different types of atoms. ... Examples of models could include drawing and diagrams

Explanation:

Answer:

You would swim 200 time's.

Hope this help's :)

An Olympic swimming pool is 50 meters long. You swim from one end to the other four times, and the kilometers that you swim are 200 kilometers.

Meters are kilometers are measurement units used to measure length. They are used to write the value of the measurements. There are seven basic units of measurement. The values are liters, kg, meters, grams, milliliters, etc.

Meter is a SI unit, it is denoted by small m, kilometers is unit of length which is denoted by km. The SI unit is the internation unit system of measurement.

One meter is equals to 1000 kilometers. An Olympic swimming pool is 50 meters long. A person swims 4 time of 50 kilometers.

So, 50 x 4 = 200 km.

Thus, the kilometers that you swim are 200 kilometers.

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Answer:

I need points for my Ap Calculs class

Explanation:

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Answer:

pink ;)

Explanation:

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