A 25.0 g sample of metal at
16.0 °C is warmed to 22.1 °C
by 259 ] of energy.
What is the change in temperature
for the metal?
Record your answer to the tenths place.

The observations are as follows:

When a mixture of iron fillings and sulfur are heated, black iron (ii) sulfide is formed.

Unlike iron fillings, black iron (ii) sulfide is not attracted to a magnet.

When carbon sulfide is added to it, no visible reaction is observed.

When dilute hydrochloric acid is added to it, a gas with a rotten-egg smell is evolved.

The gas is hydrogen sulfide which is a reducing agents and acidic in nature.

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Chemical equation

       CaCo3 → CaO+ CO2      (Decomposition reaction)

A chemical reaction that results in the breakdown of one reactant into two or more products is known as a decomposition reaction.

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Answer:

chemical equation

Explanation:

Answer:

1.) 0.1 M

2.) 0.2 M

3.) 1 M

4.) Solution #3 is the most concentrated because it has the highest molarity. This solution has the largest solute to solvent ratio. The more solvent there is, the lower the concentration and molarity.

Explanation:

To find the molarity, you need to (1) convert grams NaOH to moles (via molar mass from periodic table) and then (2) calculate the molarity (via the molarity equation). All of the answers should have 1 sig fig to match the given values.

Molar Mass (NaOH): 22.99 g/mol + 16.00 g/mol + 1.008 g/mol

Molar Mass (NaOH): 39.998 g/mol

4 grams NaOH           1 mole
----------------------  x  ------------------  = 0.1 moles NaOH
                                 39.998 g

1.)

Molarity = moles / volume (L)

Molarity = (0.1 moles) / (1 L)

Molarity = 0.1 M

2.)

Molarity = moles / volume (L)

Molarity = (0.1 moles) / (0.5 L)

Molarity = 0.2 M

3.)

Molarity = moles / volume (L)

Molarity = (0.1 moles) / (0.1 L)

Molarity = 1 M

Answer: 1.6116

Explanation:

[tex](1.32)(0.82)+(2.94)(0.18)=\boxed{1.6116}[/tex]

The weighted average of a bean in the given sample data is equal to 1.6116 g.

The weighted average can be described as a calculation that takes into account the varying degrees of importance of the numbers in a data set. Each number is multiplied by a predetermined weight in the given data set before the final calculation is made in calculating a weighted average.

A weighted average assigns weights that calculate in advance the relative abundance of each data point. A weighted average is commonly determined to equalize the frequency of the values in a data set.

Given the abundance of Black eyes peas, m₁ = 82% = 0.82

The mass of the Black eyes peas, W₁ = 1.32 g

the abundance of cannellini beans, m₂ = 18% 0.18

The mass of cannellini beans, W₂ = 2.94 g

The weighted average = m₁W₁ + m₂W₂ = 1.32× 0.82 + 2.94 ×0.18

The weighted average of a bean = 1.6116 g

Therefore, the weighted average of a bean in the sample is 1.6116 g.

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A spring tide occurs when there is a new or full moon in the solar system.

This is the type of tide which occurs when the sun, moon and earth are in line and occurs between three to four times per year.

Lunar and solar tides also line up and reinforce each other to produce this type of tide.

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2.60 moles.

Zn (s) + 2 Ag+ (aq) --> 2 Ag (s) + Zn2+ (aq), each mole of zinc gives out two moles of silver. Therefore, 1.30 moles of zinc will displace 2.60 moles of silver. ( 1.30 × 2)

More about silver nitrate:

An inorganic substance with the chemical formula AgNO3 is silver nitrate. This salt serves as a flexible base for numerous different silver compounds, including those employed in photography. Compared to halides, it is far less light-sensitive. Lunar caustic was previously the name given to it since early alchemists referred to silver as luna and connected it to the moon.

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it's true. answer is B.

a hypothesis is a stage before formation of theory. so when we put forward a hypothesis to prove something (in scientific observation) it can be proven true with the experiments conducted.

but of course it's can be proven wrong too, after the experiments conducted. then it is disregard.

a proven hypothesis (a true hypothesis)is the reason for theories.

Answer:

it's true. answer is B.

a hypothesis is a stage before formation of theory. so when we put forward a hypothesis to prove something (in scientific observation) it can be proven true with the experiments conducted.

but of course it's can be proven wrong too, after the experiments conducted. then it is disregard.

a proven hypothesis (a true hypothesis)is the reason for theories.

Explanation:

hope this helps :)

Answer:

Tin bromine = Snbr2

aluminum fluorate = AlFe3

iron oxide = Fe2o3

potassium chloride = KCL or 2KCL = K2CL2

All Pairs are correct

Answer:

Nothing will happen until you remove the thermometer.

Explanation:If the thermometer is made of mercury in glass, nothing will happen….mercury does not freeze at the temperatures in the refrigerator…

Answer: A is unreactive and D is reactive.

Explanation:

A is neon, which is a noble gas, and thus unreactive.

D is sodium, which is an alkali metal, and thus highly reactive.

Answer:

1.25 g C3H8

Explanation:

edge lol

Answer:

23,31 atm

Explanation:

p1v1 = p2v2

2.3 * 300  = p2 *29.6

p2=23.31 atm

Answer:

It is in the same phase as the reactants.

Explanation:

i took the test

The missing components of the neutralisation reaction include the following:

Neutralisation reaction is defined as the type of reaction that leads to the formation of salt and water when an acid and a base reacts.

From the reactions given the missing components are replaced as follows:

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Explanation:

The boiling point of liquid nitrogen, liquid argon, and liquid oxygen are -196°C, -186°C, and -183°C respectively. So, the correct order is nitrogen, argon, oxygen.

Nitrogen:

Since you don't want nitrogen to be condensing everywhere when it gets cold out, elemental nitrogen's boiling point is luckily below zero degrees Celsius. Thank goodness for nitrogen's extremely low boiling point. If it were at zero, boiling water would not produce a lot of heat, necessitating the use of a pressure cooker to prepare foods that typically call for boiling water. Additionally, since the air would be substantially enhanced with oxygen, items may catch fire more quickly (i.e. your home might burst in flame that much more easily). An ugly picture, to be sure.

Argon:

As nonpolar gases, Ar, F2, and Cl2 only display London Dispersion Forces (LDF). These largely negligible forces, which are the product of transient dipoles, must be resisted throughout the boiling process. Since bigger atoms and molecules have valence electrons further from their nucleus, LDF intensity is also directly correlated with atomic or molecular size. Compared to smaller atoms or molecules, these outermost electrons are less attracted to the positive nucleus or nuclei, making it simpler for them to create transient dipoles. As a result, the differing molar masses of each compound—Ar—39.95 g/mol, F—38.00 g/mol, and Cl—70.90 g/mol—can be used to explain the variation in boiling points.

Oxygen:

At 1 atm, oxygen would boil at -183 degrees Celsius if it were a liquid. Although the phase diagram for oxygen is more intricate than this, it is a general phase diagram. Imagine that the term "vaporization" is at the same height as 1 atm, which is roughly halfway up the y-axis. If the y value at that time was equal to 1 atm, the "vaporization" arrow to the right would be directly above -183 degrees Celsius. It's crucial to remember that pressure determines what temperature a substance will boil, melt, condense, or freeze, as you can probably guess. Additionally, the pressure in particular circumstances can affect what phase a material is in.

Answer:

n

Explanation:

nobody knows

Answer:

the answer will be false.

Explanation:

because it is not balanced.

40.1g of nitrogen gas is produced.

The equation given is

2 NH₃ + 3 CuO →3 Cu + N₂ + 3 H₂O

This equation is already balanced.

When 3 moles of CuO are consumed, 1 mole of nitrogen gas is produced.

We get 1 mole of nitrogen from 3 moles of copper oxide.

We need to find the number of moles of nitrogen gas produced when 4.3 moles of copper oxide are consumed.

4.3/3 x 1 = 1.433 mols

40.1g of nitrogen gas can be made when 4.3 moles of CuO are consumed.

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Any deviation in the image of an object when light passing from one medium to other is assciated to the phenomenon of refraction.

It is the deflection from a straight path undergone by a light ray while passing from one medium (such as air) into another (such as glass) in which its velocity is different.

Basically, the light refraction gives the pencil a slight magnifying effect, which makes the angle appear bigger than it actually is, causing the pencil to look crooked.

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Answer:

Explanation:

Any deviation in the image of an object when light passing from one medium to other is assciated to the phenomenon of refraction.

What is refraction ?

It is the deflection from a straight path undergone by a light ray while passing from one medium (such as air) into another (such as glass) in which its velocity is different.

Basically, the light refraction gives the pencil a slight magnifying effect, which makes the angle appear bigger than it actually is, causing the pencil to look crooked.

After Looking at the pencil from the side of a clear glass or resealable plastic bag filled three-fourths with water, we will see the light bends around the pencil, causing it to look bent in the water.

When the pencil tilt from side to side, It looks so dramatically broken on looking at it from different angles.

We can magically “fix” the broken pencil by changing where the pencil is positioned in the glass.

Answer:

31536000

Explanation:

There are 31536000 seconds in a day.

60s x 60min x 24hrs x 365 days = 31536000sec

Answer: when a reaction absorbs heat or decreases the entropy of the system,

Explanation: :)

Answer:

gravitational pull generates something called tidal force.

Explanation:

High and low tides are caused by the moon. the moons gravitational pull generates tidal force.

The heat required to warm the fuel back to it's operating temperature is 3.83×10⁷ J

The heat required to warm the fuel can be obtained as follow:

Q = MC(T₂ – T₁)

Q = 135 × 1559.45 × (298 – 116)

Q = 135 × 1559.45 × 182

Q = 3.83×10⁷ J

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Answer:

addition polymerization

Explanation:

Answer: Bubbles, burning, odor, color change, and rusting.

Explanation: Chemical changes are changes to something that is irreversible.

Answer:

C. Ketones and aldehydes

Explanation:

they are both carbonyl functional group

they both have a carbon-oxygen double bond

testosterone is an example of a ketone

formaldehyde is an example of a aldehyde

opentextbcca

wikipedia

Answer:

Ketones and Aldehydes

Explanation:

i just took tha test