Calculate the molarity of a solution prepared by dissolving 13.0 g of Na2CrO4 in enough water to produce a solution with a volume of 800. mL .

Express the molarity to three significant digits.

The best choice that explains why atoms of carbon-14 (c-14) are unstable is there are 2 more protons than neutrons in the nucleus

An atom is said to be stable if the number of neutrons in the nucleus is greater than number of protons in the nucleus, because the the neutrons increases the nuclear force which keeps the atom stable.

Thus, the best choice that explains why atoms of carbon-14 (c-14) are unstable is there are 2 more protons than neutrons in the nucleus.

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Answer:

D. there are 2 more neutrons than protons in the nucleus.

Explanation:

Answer:

Volume is 0.0247L

Explanation:

This question involves the use of Boyle's law which states that the volume of a given mass of gas is inversely proportional to it's pressure provided that temperature remains constant.

Mathematically,

v = k/p

K = VP

P1V1 = P2V2 = P3V3 = .........=PnVn

V = volume

p = pressure

Data;

P1 =1.0atm

V1 = 1.73L

P2 = 70atm

V2 = ?

P1V1 = P2V2

V2 = P1V1 / P2

V2 = (1.0×1.73)/70

V2 = 0.0247L

The volume of the sample is 0.0247L

To produce 180 millilitres of a saline solution of the same concentration, we need 1.2 milligrams of salt.

It is given that a ratio of 0.5 milligrams of salt is present in 75 millilitres of solution. Let us assign a variable x to the amount of salt present in 180 millilitres of saline solution.

To maintain the same concentration we can use the method of cross-multiplication:

The following equation can be used to determine the value of x:

0.5 mg / 75 ml = x mg / 180 ml

( 0.5 × 180) / 75 = x mg

x mg = 90 / 75

Hence x is approximately equal to 1.2 mg.

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Answer:

chemical, is the answer your looking for

Lithium carbonate contains 18.78% mass percent lithium. It should be noted that a compound's overall percentage composition of all its constituent elements is always 100%.

Only depression related to bipolar illness is authorized for lithium use. When combined with an antidepressant, it may also be successful in alleviating other types of depression, although further research is required. Discuss the possibility of adding lithium with your doctor if you are on an antidepressant but are still experiencing symptoms.

This substance is employed for the treatment of mania and depression (bipolar disorder). By bringing certain natural compounds back into equilibrium in the brain, it helps to calm mood and lessen excessive behavior.

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Surface processes such as erosion, movement, weathering, and the deposition of sediment can modify surface features, such as mountains, or create new features, such as canyons.

Have a great day!

The surface of the Earth is constantly changing as a result of geoscience processes such as weathering, erosion, and deposition. Systems on the planet interact to influence Earth's past, present, and future.

Geoscience investigates the processes that shape the Earth's surface, the resources humans utilize, and how water and ecosystems are related. It covers much more than just rocks and volcanoes. Chemistry, physics, biology, and arithmetic, as well as other scientific disciplines, are used in geoscience.

The surface of the Earth is constantly changing as a result of geoscience processes such as weathering, erosion, and deposition. Systems on the planet interact to influence Earth's past, present, and future.

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Answer: Ketone

Explanation:

the number of hydroxyl groups increases is caused by a greater degree of hydrogen bonding between the molecules.

I hope this helps

An exothermic process called combustion necessitates the interaction of fuel with a reducing agent.

An object quickly reacts with oxygen in the chemical process of burning to produce heat. Fuel and oxygen's source are the terms used to describe the original substance. Although fuel for aeroplane propulsion is normally a liquid, it can also be a solid, liquid, or gas.

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The correct statement about pericyclic reactions is:

In pericyclic reactions, all bonds are broken and formed in a single step.

Pericyclic reactions are a class of organic reactions characterized by the simultaneous breaking and forming of multiple bonds in a concerted manner, meaning that all bond changes occur in a single step. This is in contrast to stepwise reactions where bonds are broken and formed in separate steps.

In a pericyclic reaction, the reactants rearrange their electrons in a concerted fashion, leading to the formation of new bonds and the breaking of existing bonds. This concerted process occurs through the overlap of molecular orbitals, allowing for the efficient transfer of electrons.

Pericyclic reactions are concerted reactions in which the breaking and forming of bonds occur simultaneously in a single step. They do not involve multiple steps or intermediates. The transition state in a pericyclic reaction is cyclic, not acyclic.

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Unique properties of water

Water molecules have a bent overall structure, partial positive charges on the hydrogens, partial negative charges on the oxygen, and are polar. This is due to the fact that oxygen is more electronegative than hydrogen, making it more effective at drawing electrons. Excellent solvents include water.

Temperature alters the three states of water, which are solid (frozen), liquid, and gas. Although the interactions of the water molecules change, the molecules themselves do not alter between the phases.

Water quality's physical characteristics

Color: Polluted water may be coloured; pure water is colourless.

Turbidity: Clear, light-unabsorbing water is the opposite of pure water.

Taste and odour: Pure water never has a taste or an odour.

Given their polar nature, water molecules form hydrogen bonds. This gives water its distinctive properties, including polarity, solvency, cohesion, adhesion, high specific heat, and the capacity to act as a buffer. A solute that has dissolved in a solvent creates a homogeneous mixture known as a solution.

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The density of the aluminum piece is 2.71 g/cm^3.

Density is calculated by dividing the mass of an object by its volume. In this case, we have the mass of the aluminum piece as 96.5 g and the volume as 35.7 cm^3.

Density = Mass / Volume

Density = 96.5 g / 35.7 cm^3

To calculate the density, we divide the mass by the volume:

Density = 2.71 g/cm^3

Therefore, the density of the aluminum piece is 2.71 g/cm^3.

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Answer:

Geysers are made from a tube-like hole in the Earth's surface that runs deep into the crust. The tube is filled with water. Near the bottom of the tube is molten rock called magma, which heats the water in the tube. ... Its powerful jet of steam ejects the column of water above it.

Explanation:

The study conducted by Janzen and Bettany in 1984 investigated the influence of nitrogen and sulfur fertilizer rates on the sulfur nutrition of rapeseed plants.

The researchers examined the relationship between the application rates of nitrogen and sulfur fertilizers and their effects on the growth and sulfur uptake of rapeseed plants.

In their study, Janzen and Bettany focused on understanding the impact of nitrogen and sulfur fertilizers on rapeseed plants' sulfur nutrition. They conducted experiments where different rates of nitrogen and sulfur fertilizers were applied to the soil, and the growth and sulfur uptake of rapeseed plants were measured. The researchers aimed to determine the optimal fertilizer rates that would promote adequate sulfur nutrition in the plants, leading to better growth and development.

The study's findings provided insights into the relationship between nitrogen and sulfur fertilizers and their influence on rapeseed plants' sulfur nutrition. This information can be valuable for agricultural practices, helping farmers optimize fertilizer application to enhance crop yield and quality. Additionally, the study contributes to the broader understanding of plant nutrient interactions and the importance of sulfur nutrition in the growth of rapeseed plants.

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Scientific notation is a way that makes it possible to express too large or too small numbers, being written in the decimal form, and all the extra numbers will be reduced to a number between 1 and 9.9 multiplied by 10 raised to some power

In the case of the question we have the addition of two numbers in scientifc notation

Instead of being 12600 + 25000, it is 1.26*10^4 + 2.50*10^4, which is equal to

37600 or in scientific notation = 3.76*10^4

Graphite's sublimation at high temperatures is due to its unique structure and weak interlayer bonding. Graphite's high thermal conductivity, and stability at high temperatures make it suitable for heating applications.

Graphite consists of layers of carbon atoms arranged in a hexagonal lattice. Within each layer, the carbon atoms are bonded together through strong covalent bonds, creating a strong and stable structure. However, the bonding between the layers is relatively weak, allowing the layers to slide over each other easily.

The sublimation of graphite occurs because the energy required to break the weak interlayer bonds is much lower than the energy required to convert the covalent bonds within the layers from a solid to a liquid. Therefore, when graphite is heated to temperatures above 3800K (3526.85°C or 6380.33°F), the thermal energy is sufficient to overcome the interlayer bonding, causing the graphite to sublime directly into a gas without passing through a liquid phase.

Graphite is commonly used in heating applications due to its excellent thermal conductivity and stability at high temperatures.

Graphite's high thermal conductivity allows it to rapidly conduct heat and distribute it evenly, making it suitable for applications requiring uniform heating. It also has a relatively low coefficient of thermal expansion, meaning it can withstand thermal cycling without cracking or deforming.

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Answer:

3.39 mol

Explanation:

n = m/M, where n is moles, m is mass and M is molar mass.

n = 149/44.01

n = 3.38559418314 mol

n = 3.39 mol

Hope that helps

Answer:

A

Explanation:

Answer and explanation

The solvent in the graph is water (H2O), water tells us that these substances dissolve at different amount of water, and the dissolvation is different in different temperatures in water. For example, NaCl readily dissolves in water.

Answer:

that is all I know sorry hope that may help you :)

Explanation:

Indicator is a substance which shows different colors in acidic and basic medium. Indicators can be natural (derived from natural sources) or artificial ( man-made) for example :

*Litmus is an indicator. Acid turns blue litmus into red while base turns red litmus into blue

* Turmeric solution does not show change in color (remains yellow) in acidic solution and turns red in basic solution.

Answer:

Often a chemist needs to heat materials. The Bunsen Burner is one of the most efficient ways of doing this.

Explanation:

Answer:The answer IS true

Explanation:

Answer:

Magma

Explanation: cuz S waves travel through solids water, soil, and air are not solids so ur answer is B; magma

Answer:

c. soil

Explanation:

this is the correct answer not the one above...

Answer:

It's compound? It's chemical compound would be represented my letters or numbers

Answer:

The letters in a chemical formula are the symbols for the specific elements. So for example, H means hydrogen, O means oxygen, S means sul fur, C u means copper, F means fluorine, Fe means iron and Au means gold.

Explanation:

Yea, Hope I helped

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At the stoichiometric point for a titration between hydrochloric acid (HCl) and ammonia (NH₃), the pH is expected to be greater than 7. The correct option is (a) > 7.

In the given titration, hydrochloric acid (HCl) is a strong acid, and ammonia (NH₃) is a weak base. At the beginning of the titration, the hydrochloric acid is in excess, and the solution is acidic, resulting in a pH less than 7. As the titration proceeds and ammonia is gradually added, it reacts with the hydrochloric acid to form ammonium chloride (NH₄Cl).

At the stoichiometric point, the moles of hydrochloric acid and ammonia are in the ratio dictated by the balanced chemical equation. This point signifies that all the hydrochloric acid has reacted with the ammonia, and no excess of either is present in the solution. The resulting solution consists mainly of the ammonium chloride salt.

Ammonium chloride is the salt of a weak base (ammonia) and a strong acid (hydrochloric acid). When dissolved in water, it undergoes hydrolysis, releasing H+ ions, which makes the solution acidic. Therefore, at the stoichiometric point of this specific titration, the pH is expected to be greater than 7, indicating an acidic solution.

It's important to note that this is a generalization and can vary depending on the specific titration and the concentrations of the reactants involved. However, in the given context of a titration between hydrochloric acid and ammonia, the pH at the stoichiometric point is expected to be greater than 7.

The correct option is a.

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Answer:

c

Explanation:

i think

The independent variable in this investigation is the ice cubes added. The correct option is 2.

A scientific experiment is an experiment that is done to calculate or check out a reason for scientific things to happen. It is done with variables, these variables are controlled, independent, and dependent.

The cause is the independent variable. Its value is unaffected by the other study variables. In this instance, the amount of ice in each sample of water determines its temperature. So, the independent variable is the amount of ice.

Therefore, the correct option is 2. Ice cubes were added.

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