An object with a mass of 0.255 kg and density of 2.89 g/cm3 measures 34 mm in length and 46 mm in width. What is the height of the object?

Answer:

31.9988 this may help u ......

Properties of matter which are involved in floating the boats are density and volume as less dense materials present in boats will enable it to float on water.

Matter in chemistry, is defined as any kind of a  substance which has mass and occupies space that means it possesses volume .Matter is composed up of atoms which may or not be of same type.

Atoms are  made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.

The states of matter are inter convertible into each other by varying the parameters of temperature and pressure.

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The kinetic energy of electrons emitted from chromium surface is determined as  2.9  x 10⁻¹⁹ J.

The energy of the emitted photon is calculated as follows;

E = hf

E = hc/λ

where;

E = (6.626 x 10⁻³⁴ x 3 x 10⁸) / (200 x 10⁻⁹)

E = 9.94 x 10⁻¹⁹ J

Φ = 4.4 x 1.6 x 10⁻¹⁹

Φ = 7.04 x 10⁻¹⁹ J

E = K.E + Φ

K.E = E - Φ

K.E = 9.94 x 10⁻¹⁹ J - 7.04 x 10⁻¹⁹ J

K.E = 2.9  x 10⁻¹⁹ J

Thus, the kinetic energy of electrons emitted from chromium surface is determined as  2.9  x 10⁻¹⁹ J.

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Answer:

A. Argon

Explanation:

it is a gas that makes up to 1% of the atmosphere

Answer:

The image appears to have some words cropped out. Nonetheless, "receptor" would seem to be the most appropriate term here.

Energy is released during nuclear reactions. To calculate energy changes, use the attached image below. Nuclear reactions produce far more energy than other types of reactions, such as chemical reactions.

The term nuclear reaction is defined as a process in which two nuclei, or a nucleus and an external subatomic particle, collide to produce one or more new nuclides.

Normally, chemical reactions take place outside the nucleus. Nuclear reactions occur only within the nucleus. When chemical reactions occur, elements retain their identity, as do the nuclei of atoms.

Thus, in nuclear reactions, the nuclei of atoms undergo complete transformations, resulting in the formation of new elements.

The nuclear reactions are as follows:

Alpha decay - PO₈₄²°⁶⇒ ₈₂Pb²°⁶ + He⁴₂

Beta⁻ decay - Na²²₁₁ ⇒ Na ²²₁₀ + e°₋₁

Beta⁺ decay - Na²⁴₁₁ ⇒ Na₁₀²⁴ + e°₋₁+β

Gamma - CO⁶°₂₇ ⇒ Ni⁶⁰₂₆ + e°₋₁ +γ

Fission - U²³⁵₉₂ + n₀¹ ⇒ Ba¹⁴⁴₅₆ + Kr⁸⁹₃₆ +3n₀¹

Fusion- H₁² +H³₁ ⇒ He⁴₂ + n¹₀ +17.59MeV

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Answer:

1.059 x 10^24 formula units

Explanation:

103/58.44 = 1.76 moles NaCl

1.76 x 6.022 x 10^23 = 1.059 x 10^24

Answer:

nitrous oxide

Explanation:

Answer:

C. Water falls from the sky as rain. The water then flows downhill.

Explanation:

Water cycle can be defined as a process which typically involves the circulation (movement) of water between the Earth's atmosphere, land and ocean under various atmospheric conditions such as precipitation (rain and snow), transpiration, condensation and evaporation.

Basically, the movement of the water starts from the sky due to the condensation of water vapor to form clouds and later result to rainfall. Consequently, the rain water are either soaked by the soil or are made to flow down the hill.

The statement which best describes a way in which water moves in the water cycle is that, water falls from the sky as rain. The water then flows downhill or seeps into the ground.

When measuring heat transfer, the sign of the delta T (ΔT) and the heat transfer (q) values is significant.

The negative sign indicates that the heat flow is in the opposite direction from the expected direction based on the given temperature gradient. When a negative sign is present in the delta T value or heat value, it implies that heat is being absorbed rather than being given off.  For example, when a substance absorbs heat, the temperature difference between the two regions decreases, resulting in a negative delta T value. When the surroundings absorb heat, the object's temperature drops, resulting in a negative heat value. The opposite is true for positive signs. When an object loses heat, its temperature drops, and the temperature difference between two regions increases, resulting in a positive delta T value. The heat transfer is said to be positive if heat is given off by the system to the surroundings. When heat flows from the surroundings to the system, the heat transfer is negative. The negative sign is significant since it shows that the energy flow is in the opposite direction from the expected direction based on the given temperature gradient.The amount of heat transferred by the system is proportional to the absolute value of the heat value and the delta T value.

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Answer:

C

Explanation:
Cause wave's get larger and larger and it will repeat over and over

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Answer: A) Volume of a gas B) Number of molecules C) temperature &pressure

Explanation: The law also states that the Kelvin temperature and the volume will be in direct proportion when the pressure exerted on a sample of a dry gas is held constant.

Answer: Industrial processes including mining and manufacturing historically have been leading causes of soil pollution. Industrial areas typically have much higher levels of trace elements and organic contaminants. This is due to intentional and unintentional releases from industrial processes directly into the environment, including to the soil, adjacent water bodies, and the atmosphere.

Explanation:

Answer:

B

Explanation:

If AH and AS are both negative  will a low temperature make a reaction spontaneous.

A spontaneous reaction is a reaction that favors the formation of products at the conditions under which the reaction is occurring. A roaring bonfire (see figure below) is an example of a spontaneous reaction.

A fire is exothermic, which means a decrease in the energy of the system as energy is released to the surroundings as heat.

The products of a fire are composed mostly of gases such as carbon dioxide and water vapor, so the entropy of the system increases during most combustion reactions.

Therefore,  If AH and AS are both negative  will a low temperature make a reaction spontaneous.

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The balanced molecular equation for the reaction between sodium hydroxide (NaOH) and aluminum chloride (\(AlCl_3\)) in aqueous solution can be written as follows: 2NaOH(aq) + 3\(AlCl_3\)(aq) → 3NaCl(aq) + \(Al(OH)_3\)(s)

In this reaction, sodium hydroxide (NaOH) reacts with aluminum chloride (\(AlCl_3\)) to form sodium chloride (NaCl) and aluminum hydroxide (\(Al(OH)_3\)). The coefficients in the balanced equation indicate the stoichiometric ratio between the reactants and products.

The physical states of the substances are indicated by the symbols (aq) for aqueous solutions and (s) for the solid precipitate.

The reaction is a double-displacement reaction, also known as a precipitation reaction. Double-displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.

In this case, sodium hydroxide and aluminum chloride react to form sodium chloride and aluminum hydroxide, with aluminum hydroxide being the white solid precipitate.

It's worth noting that the actual reaction might involve hydrated forms of the compounds, such as NaOH·x\(H_2O\) and \(AlCl_3\)·y\(H_2O\). However, for simplicity, these hydrated forms are not included in the balanced equation.

Overall, the balanced equation represents the chemical reaction between sodium hydroxide and aluminum chloride, showing the reactants, products, and their stoichiometric ratios.

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Answer:

CH4+2O2→CO2+2H2O

Moles of oxygen=3232=1

Moles of carbon dioxide=4422=0.5

Moles of water=1818=1

1 mole of methane reacts with 2 moles of oxygen to give 1 mole of CO2 and 2 moles of water so 0.5 mole of methane will be required which is equal to 0.5×16=8g.

Explanation:

8g

To draw a Bohr Rutherford diagram for carbon-12, we would have the symbol C in the center, with 2 electrons in the first energy level and 4 electrons in the second energy level, arranged in pairs. Each energy level would be represented by a circle around the nucleus, with the appropriate number of electrons placed in the circles.

A Bohr Rutherford diagram is a visual representation of the electron arrangement in an atom. Carbon-12 has 6 protons and 6 neutrons, which means it has 6 electrons as well since it is a neutral atom. In a Bohr Rutherford diagram, the nucleus is represented by the symbol for the element and the protons and neutrons are shown as small circles inside the symbol. The electrons are represented as dots or circles around the symbol, in the order of increasing energy levels.

In the case of carbon-12, the first energy level can hold a maximum of 2 electrons, and the second energy level can hold a maximum of 8 electrons. Therefore, the first energy level will have 2 electrons, and the remaining 4 electrons will go in the second energy level.

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The number of atoms of O in 46.6 moles of Al₂(CO₃)₃ is  2.52 x 10²⁶

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Answer:

p block.

Explanation:

jus took the test

Answer:

c p block

Explanation:

The final broth temperature will be approximately 38.4°C.

When mixing two substances with different temperatures, we can use the principle of conservation of energy. The energy lost by the hot substance (broth) is equal to the energy gained by the cold substance (water), assuming no energy is lost to the surroundings. This can be expressed using the equation:

Q_lost = Q_gained

The energy lost by the broth can be calculated using the formula:

Q_lost = m_broth * c_broth * (T_final - T_initial)

where m_broth is the mass of the broth, c_broth is its specific heat capacity, T_final is the final temperature, and T_initial is the initial temperature of the broth.

Similarly, the energy gained by the water can be calculated using:

Q_gained = m_water * c_water * (T_final - T_initial)

Since the two substances reach thermal equilibrium, we can set Q_lost equal to Q_gained:

m_broth * c_broth * (T_final - T_initial) = m_water * c_water * (T_final - T_initial)

Plugging in the given values and solving for T_final, we find that the final temperature of the broth is approximately 38.4°C.

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answer and explanation

the molar mass of H20 can be found to be

H: 2 x 1.00g/mol

O: 1 x 16.00g/mol

= 18.00g/mol

this is true, wind energy is a renewable natural resource c:

Answer:

The final temperature of the copper would be 311.3°C.

I hope this helps you

Explanation:

Factors which determine how fast a solute will dissolve are as follows.

1). Surface area of dissolving particles - More is the surface area of dissolving particles available more it will come in contact with high number of particles. As a result, more interaction causes more collision between particles due to which more solute will dissolve in solvent.

2). Stirring - More stirring in a solution will lead to more number of collisions between the particles. Hence, more solute particles will dissolve in it.

3). Temperature - More is the temperature provided to solution more will be kinetic energy of its particles. This causes more collisions and therefore, more dissolution of solute particles in the solvent will take place.

Answer:

Voltage is the measure of electric potential energy per unit charge, current is the flow of electric charge through a circuit, and resistance is the property of a material that opposes the flow of electric current.

Ohm's Law relates these three concepts by stating that current is directly proportional to voltage and inversely proportional to resistance.

Hope this helps!

Answer:

A and B are helped

Explanation:

I just learned this topic in school :)

Answer: a and be helped

Explanation: you can mark them brainliest now

The reaction is a substitution reaction of a chlorobenzene with bromine in the presence of iron(III) bromide (FeBr3) as a catalyst. The two major products in this reaction are ortho-brominated and para-brominated derivatives of the chlorobenzene.

The structures of these two products can be represented as follows:

Ortho-brominated product and Para-brominated product.

It's worth noting that the ortho- and para-brominating of chlorobenzene is a two-step reaction. First, the iron(III) bromide catalyst reacts with bromine to form iron(III) bromide hexahydrate (FeBr3•6H2O), which acts as a source of electrophilic bromine. The electrophilic bromine then reacts with the chlorobenzene to form the ortho- and para-brominated derivatives.

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Answer:no

Explanation:

Answer:

Scandium is a transition metal

Explanation:

Energy is released by the formation of chemical bonds, and energy is

absorbed when the bonds are broken.

A chemical reaction involves the formation of new compounds from

reactants . It involves the formation and breaking of bonds in the

elements.

Energy is released by the formation of chemical bonds and this type of

reaction is referred to as exothermic while energy is absorbed when the

bonds are broken and is referred to as an endothermic reaction.

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