Which are indicators that a chemical change has occurred? Check all that apply. change in odor change in shape change in energy change in color change in size o formation of a precipitate​

Answer:

This question is incomplete

Explanation:

This question is incomplete because the result of the described experiment would have better determined the type of scientific explanation to profer. However, the type of material that will preserve the relative hotness or temperature of the hot coffee for the longest time will be a material than can resist heat transfer. These materials tend to keep hot substances hot by not allowing the heat of the coffee to be conducted or pass through it. These materials are mostly insulators or made by placing an insulator between two heat conductors.

Generally, heat is usually transferred from a region of higher concentration to a region of lower concentration, hence when the heat is denied of this transfer, the heat will remain trapped in the "heat-donor" substance (in this case the hot coffee). Thus, the material chosen (A, B or C) will be the material that resists heat transfer the most based on the explanation above.

Answer:

the answer is 1,000 m

Explanation:

Answer:

C ≈ 1.44 × 10⁻³ mol/m³

Explanation:

The given information are;

The liquid volume the pond can hold = 104 m³

The volume of inflow into the pond = 5 m³/h

The volume of outflow into the pond = 5 m³/h

The concentration of the chemical in the inflow water = 0.01 mol/m³

The concentration of the chemical discharged directly into the water = 0.1 mol/h

The concentration, [tex]c_{(inflow)}[/tex], of chemical that enters the water through inflow per hour is given as follows;

[tex]c_{(inflow)}[/tex] = 0.01 mol/m³ × 5 m³/h = 0.05 mol/h

The concentration, [tex]c_{(discharge)}[/tex], of chemical that enters the water through direct discharge per hour is given as follows;

[tex]c_{(discharge)}[/tex] = 0.1 mol/h

The total concentration that enters the pond per hour is given as follows;

[tex]c_{(inflow)}[/tex] + [tex]c_{(discharge)}[/tex] = 0.1 mol/h + 0.05 mol/h = 0.15 mol/h

Whereby the water in the pond properly mixes with the pond, we have;

The concentration of chemicals (C) in the outflow water = 0.15 mol/(104 m³) ≈ 0.00144 mol/m³

C ≈ 1.44 × 10⁻³ mol/m³.

Answer:

Ello and im good

Explanation:

Answer:

Hello good how are you

Explanation:

When sodium acetate is dissolved in water, it is hydrolyzed into ions.

When a salt of weak acid or base is dissolved in water, this salt hydrolysis in it. Water ionises into hydroxide and hydrogen due to addition of sodium acetate. In water, sodium acetate splits into sodium and acetate ions.

So we can conclude that when sodium acetate is dissolved in water, it is hydrolyzed into ions.

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Answer:

I think it’s b

Explanation:

The boiling point of aluminum is 2519 degrees Celsius ( hope this helps! )

The number of grams of iron present in 14.79 cm length of the same iron rod is 640.51 g.

Ounces is a unit of mass which is used to define a very little amount of anything.

In the question, given that:

In one inch of iron rod whose weighs is 3.88 ounces = 2.54 cm long

In 1 g = 0.035273 ounces present

So we can calcuylate the number of grams in which 3.88 ounces present as:
x = (3.88 ounces) / (0.035273 ounces/g)

x = 110g

So, in 110g = 3.88 ounces present

And in 2.54 cm = 110g of iron present

In 14.79 cm, present grams of iron can be calculated as:

y = (14.79cm x 110g) / 2.54cm

y = 640.51 g

Hence option (c) is correct i.e. 640.51 g.

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The weight of the iron rod with 14.79 cm length with same density is given by: Option C; 640.51 g

Suppose that a finite amount of substance is there having its properties as:

Then, they are related as:

[tex]d = \dfrac{m}{v}[/tex]

We know that:

Now, from the facts given in the problem, we have:

The weight of first iron rod which is one inches long = 3.88 ounces

The new rod is 14.79 cm long. And 1 cm = 0.3937 inches approx, thus the new rod is: [tex]14.79 \times 0.3937 \approx 5.8228 \: \rm inches[/tex]

As for 1 inch long rod, there is  weight of 3.88 ounces, thus:

for 5.8228 inch rod, the weight of the rod would be [tex]5.8228 \times 3.88 \approx 22.5924 \: \rm ounces[/tex]

And since 1 ounce = 28.3495 g approx

Thus, weight of the new rod in grams would be [tex]22.5924\times 28.3495 \approx 640.485 \approx 640.51\: \rm g[/tex]

Thus, the weight of the iron rod with 14.79 cm length with same density is given by: Option C; 640.51 g

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Answer:

13.04%

Explanation:

m/v = g/mL *100 = 3.26/25*100

Answer:Newton's third law of motion is naturally applied to collisions between two objects. In a collision between two objects, both objects experience forces that are equal in magnitude and opposite in direction. Such forces often cause one object to speed up (gain momentum) and the other object to slow down (lose momentum

Explanation:

Answer:

c

Explanation:

QUESTION :WHAT TYPE OF BOND IS CA + AR

ANSWER :

C .

COVALENT.

HOPE IT HELP

THANK ME LATER.

Answer:

Explanation:

KI:

The name of salt consist of two parts. The first part is the name of metal and second is the name of nonmetal.

So we name the cation first and then anion.

IN given formula cation is potassium while anion is iodine.

The -ine of anion is converted into -ide. Thus the name will be potassium iodide.

Fe₂O₃

First of all we will write the name of cation and then anion.

               Iron    oxygen

Then the we will add -ide at the end of name of anion such as, oxide, chloride, fluoride etc.

               Iron oxide

Now we will calculate the charge on oxygen and iron. We know that the charge on oxide is -2 and thus the total charge on oxygen is 3(-2) = -6. Thus iron must have +3 oxidation state to cancel the charge and make compound neutral. It means 2(+3) = +6

The oxidation state of transition metal will be written in parentheses.

               Iron(III) oxide

(NH₄)₃PO₄

To write the name we must know which is cation and which is anion.

In given formula NH₄⁺ is cation and it carry +1 charge while PO₄³⁻ is anion and it carry -3 charge.

When we write the name we write first the name of cation and then anion.

Here the cation name is ammonium while anion name is phosphate thus the name of compound is ammonium phosphate.

In order to make the compound neutral the opposite charges must be equal to cancel each other.

That's why three ammonium ions are attached with one phosphate ion to make the compound neutral.

Answer:

make the particles close together (eg a solid is more dense than liquids as it has a fixed shape)

Some of the negative consequences of cobalt mining are pollution and child trafficking.

Many young children are made to work in mines generally either due to continued struggle for survival or forced into it by child traffickers.

Apart from that, cobalt mining causes pollution in the environment. Inhalation of dust containing cobalt causes a host of health issues such as lung cancer and damage to human skin.

Other effects include soil degradation and pollution, water pollution due to mine run-offs, etc.

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Answer:

one.

Which of the following are negative consequences of cobalt mining in the Democratic Republic of Congo? Select the two correct answers.

Dust from cobalt mines causes lung and skin damage.

Thousands of children work in cobalt mines.

2.

Which of the following statements about recycling electronic waste is true?

Minerals can be extracted from recycled electronics.

3.

Which of the following resources is a conflict mineral used in smart devices?

tin

Explanation:

its all right 200% if you dont hink so thats all right check for your self

Neon element which is in gaseous form is used in lit advertising signs as it emits reddish orange glow on passage of current through it.

It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.

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#SPJ2

Answer:

A sun

Explanation:

sunThe core of the sun is so hot and there is so much pressure, nuclear fusion takes place: hydrogen is changed to helium. Nuclear fusion creates heat.

Convert mole to gram multiply it by the molar mass of BeI2

BeI2 molar mass = 262.8122g

0.6 moles x 262.8122g = 157.68g BeI2

Work is done when the arrow is released from the bow. When this work is not done, the bow is damaged.

We know that energy is neither created nor destroyed rather is converted from one form to another. When the string of the bow is pulled back the elastic potential energy does work and the arropow is released. The elastic potential energy is converted to the kinetic energy of the moving arrow.

However, when this work is not done, the whole energy in the string does work on the bow thereby damaging it.

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Answer:

2.52atm for sure

Explanation:

We know that:

P1= 2.80atm

T1= 400k

T2= 360k

And we want to find P2= ?

We have an equation: P1/T1 = P2/T2

Multiple both side by T2 to remove it

P2 = 2.52

Answer:

they are inversly related

Explanation:

As the force increases distance decreases .They are related with an equation

F= Gm1×m2/r^2

The pOH of a solution is 6, then the pH of the solution is 8 moles per liter.

pOH of any solution defines as the negative logarithm of the concentration of hydroxide ions (OH⁻).

In the question given that,

pOH of the solution = 6

i.e. -log[OH⁻] = 6

[OH⁻] = 10⁻⁶

Also we know that, pH + pOH = 14

pH = 14 - 6 = 8 mol/L

Hence, pH of the solution is 8 mol/L.

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Answer:

20.1797 u or g/mol

Explanation:

I looked it up.

Answer:

most likely climate changes and or mass extinction

Explanation:

Answer:

Look below

Explanation:

Climate changes.

Answer:

Sodium Hydroxide!

Explanation:

- The equation above is balanced.

Hence, the other product in the given reaction is sodium hydroxide

Answer:

Because they wear rubber gloves