An unknown substance is heated from 10 °C to 25 °C. The table below shows the state of the substance at different temperatures.


Time
(minutes) Temperature of liquid
(degrees Celsius) State of matter
0 10 Solid
2 15 Solid
4 17
6 17
8 17
10 23 Liquid
12 25 Liquid

Which statement is correct about the unknown substance?


Its melting point is 17 °C.

Its melting point is 15 °C.

The substance sublimes at 15 °C.

The substance exists as a gas at 17 °C.


(This is science)

No.

Since Boron is a poor conductor of electricity it is non-reactive. For that case it is still water soluble.  

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No, it is a poor conductor of electricity

1) Everything is made up of atoms. 2)Atoms are indivisible and also undestroyable. 3) The combination of 2+ different kinds of atoms creates compounds 4) A chemical reaction happens when atoms are rearranged/moved around.

Dalton's atomic theory provides a basis for understanding matter at a microscopic level. This understanding aids in interpreting the differences in the three states of matter - solid, liquid, and gas. In these different states, atoms exhibit different degrees of freedom and arrangements.

The atomic theory of atoms was initially proposed by Dalton and it provides a microscopic understanding of the macroscopic properties of matter. According to Dalton's atomic theory, all matter is composed of small particles called atoms and each element has its unique type of atom. And crucially, atoms are neither created nor destroyed during a chemical change, which illustrates the principle of the law of conservation of matter.

This theory helps us understand the difference in the three states of matter (solid, liquid, and gas). In solids, atoms are tightly packed together, and have little freedom to move, resulting in a defined shape and volume. In liquids, atoms have more freedom to move but are still close together, resulting in a defined volume, but the shape of the liquid changes to fit its container. In gases, atoms have the most freedom to move and are farther apart, resulting in neither a defined shape nor volume.

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It is number 2.

Because an acid or base's strength refers to its degree of ionization. A strong acid will completely ionize in water while a weak acid will only partially ionize.

Therefore, whether a acid is strong or weak is based on their ionization in water. Thus, the same goes for the base.

A strong base is a base which  is completely dissociated in an aqueous solution.

Answer:

1-b, 2-b, 3-b, 4-B, 5b

Explanation:

HONORS CHEMISTRY

1. complete ionization in water

2. ionization constant

3. a god hydrogen-ion acceptor

4. weak acid

5. this base ionizes slightly in aqueous solutions

starfish , squid , sea turtle are the only ones i know

= 1.183 × 10^25 atoms

Volume of  a cylinder is given by the formula;

πr²h , where r is the radius, and h is the height or length.

Volume = 3.14 × 2.5² × 10

             = 196.25  cm³

But density = 2.7 g/cm³

Therefore;

Mass = volume × density

        = 196.25 × 2.7

        = 529.875 g

But; 1 atom =  4.48 x 10-23 g

Therefore;

Number of atoms = 529.875 g / 4.48 x 10-23 g

                              = 1.183 × 10^25 atoms

Answer:

1.2 x 1023 atoms

Explanation:

Here is the complete sentence: After a rock break down, materials that are left combine with organic materials to form SOIL.

The process by which rocks are broken down is called weathering. There are different type of weathering, but the resultant effect of all of them is to break down rocks into smaller particles. The broken down particles usually combine with mineral content, moisture, gases and humus in order to form a complete soil.

Answer:

octahedral

Explanation:

Six bonding pairs around a central atom result in an octahedral. Hence, option D is correct.

Octahedral molecules contain six atoms bonded to the central atom and no lone electron pairs, making the steric number equal to six.

VSEPR theory was first coined by Gillespie and Nyhlom in 1957 as an improvement over the Sidgwick - Powell theory.

According to this theory, the shape of a molecule is determined by the number of electron pairs that surround the valence shell of the central atom in the molecule.  The electron pairs are positioned as far apart in space as possible to minimize the repulsion of electron pairs.

However, the presence of lone pairs distorts the shape anticipated for the molecule on the basis of VSEPR.

For a molecule having six electron pairs, an octahedral geometry is expected(electron domain geometry).

Hence, option D is correct.

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In thrust faulting: sedimentary rock is horizontal and undeformed

older rock layers are pushed on top of younger rock layers

extreme pressure changes metamorphic rock into igneous rock

the surface of the earth is raised only slightlysedimentary rock is horizontal and undeformed thats the one

Hope this helped!

Thrust faulting is a form of geological fault that occurs when one section of earth's crust is forced over another, causing rock layers to overlap and creating geological features like mountains. It's associated with the forces of tectonic plate interactions and plays a key role in understanding how the earth's surface has changed over time.

In the earth's crust, thrust faulting is a type of fault in geology that occurs when one slab of the earth's crust is forced up and over another. This movement results in layers of rock being pushed on top of each other, causing significant distortion and upheaval, as well as leading to the creation of various geologic features such as mountains. The process of thrust faulting is often associated with the powerful forces of tectonic plate interactions, particularly at convergent boundary areas where plates are pushing against each other. It's an essential concept in interpreting the earth's complex geological history as it contributes to our understanding of how our planet's surface has changed and evolved over many millions of years.

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E = m × c × θ,

Q = 6.00 kJ

given that the heat capacity of the final solution is the same as that of pure water of equal mass.

ΔH = 468 kJ/mol.

Both answers come with three sig. fig. as in data in the question.

Final mass of the solution:

[tex]m = \text{Mass of Solution} = \text{Mass of Solute} + \text{Mass of Solvent} = 51.55 + 5.12 = 56.67\;\text{g}[/tex].

An increase in temperature by one degree celsius is the same as an increase in temperature by one degree Kelvin. Change in temperature:

[tex]\Delta T = \text{Final Temperature} - \text{Initial Temperature} = 49.8 - 24.5 = 25.3\;\text{K}[/tex].

Assume that the specific heat capacity of the NaOH solution is the same as the specific heat capacity of pure water:

[tex]c = 4.182\;\text{J}\cdot\text{g}^{-1}\cdot\text{K}^{-1}[/tex].

In other words, it takes 4.182 Joules of energy to raise the temperature of one gram of pure water by one degree Kelvin. Assume that so is the case for the NaOH solution.

Energy change:

[tex]Q = c\cdot m \cdot \Delta T = 4.182 \times 56.67 \times 25.3 = 5995.95\times 10^{3} \;\text{J} = 6.00\times 10^{3}\;\text{J}[/tex].

Refer to a periodic table for relative atomic mass:

Formula mass of NaOH:

[tex]M(\text{NaOH}) = 22.990 + 15.999 + 1.008 = 39.997\;\text{g}\cdot\text{mol}^{-1}[/tex].

How many moles of formula units in that 5.12 gram of NaOH?

[tex]\displaystyle n = \frac{m}{M} = \frac{5.12}{39.997} = 0.128010\;\text{mol}[/tex].

ΔH measures the energy change per mole of NaOH dissolved. Dissolving 5.12 grams or 0.128010 moles of NaOH releases [tex]5.99595\times 10^{3} \;\text{J}[/tex] of energy.

[tex]\displaystyle \Delta H = \frac{Q}{n} = \frac{5.99595\times 10^{3}\;\text{J}}{0.128010\;\text{mol}} = 4.68\times 10^{5}\;\text{J}\cdot\text{mol}^{-1} = 4.68\times 10^{2}\;\text{kJ}\cdot\text{mol}^{-1}[/tex].

To calculate q of the solution, use q = m × c × ΔT. To find ΔH in kJ/mol for the reaction, use ΔH = q / n.

To calculate q of the solution, we can use the equation: q = m × c × ΔT, where m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature. The specific heat capacity of water is approximately 4.18 J/g°C. First, we need to calculate the mass of the water by subtracting the mass of NaOH from the total mass. Then, we can calculate q using the equation.

To find ΔH in kJ/mol for the reaction as it occurred in the calorimeter, we can use the equation: ΔH = q / n, where n is the number of moles of NaOH. First, we need to calculate the number of moles of NaOH by dividing the mass of NaOH by its molar mass. Then, we can calculate ΔH using the equation.

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C. 300 N

From Newton second's Law of motion, the resultant force is directly proportional to the rate of change in momentum.

Therefore;

F = ma ; where F is the resultant force, m is the mass and a is the acceleration.

Therefore;

F = 0.06 kg × 5,000 m/s/s

  = 300 N

The net force on the arrow to the nearest newton during this acceleration is: C. 300 Newton.

Given the following data:

To determine the net force on the arrow to the nearest newton during this acceleration, we would apply Newton's Second Law of Motion:

Newton's Second Law of Motion states that the acceleration of an object or body is directly proportional to the net force acting on the object or body while being inversely proportional to its mass.

Mathematically, Newton's Second Law of Motion is given by this formula;

[tex]Net\;force = mass \times acceleration[/tex]

Substituting the given parameters into the formula, we have;

[tex]Net\;force = 0.06 \times 5000[/tex]

Net force = 300 Newton

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∞ 234483279c20∞

D. evaporation and iceberg formation

because weathering rocks are mde up of salt and minerals creating iceberg formations and the evaporation density changes throughout concentration in the ocean.

Final answer:

The two factors most directly responsible for increasing the concentration of salt in the ocean are evaporation and iceberg formation. Evaporation leaves salts behind in the water, and iceberg formation concentrates salts by freezing freshwater, leaving salts in the ocean.

Explanation:

The question asks which pair of factors are most directly responsible for increasing the concentration of salt in the ocean. The correct answer is D. evaporation and iceberg formation. Evaporation of ocean water increases the salt concentration because when water evaporates, it leaves the salts behind, thus concentrating them. Iceberg formation similarly contributes to salt concentration. When sea water freezes to form icebergs, it primarily forms as freshwater ice, leaving the salts in the surrounding water, thus increasing its salinity.

Answer: Liquid water can never go over the boiling tempurature because it will turn into steam. The heat is going into the water particles which converts the liquid into steam.

Explanation:

When liquid particles are heated, they move around faster and bump into each other, and destribute the heat around the liquid evenly. This process is called convection. As the particles move fast enough, they turn the liquid into a gas. This process is called evaporation. So the gas is now at a liquid boiling point tempurature, but it in a liquid form can never go higher from that tempurature without turning into a gas.

At boiling point, added energy converts liquid water to gas by breaking intermolecular forces, not raising the temperature.

The boiling point of water occurs when its vapor pressure equals the external pressure.

At standard atmospheric pressure, water boils at 100°C (212°F).

Heating water increases molecular kinetic energy, aiding in overcoming intermolecular forces.

Instead of raising the temperature further, added energy breaks intermolecular bonds, initiating vaporization.

Vaporization is the phase change from liquid to gas, driven by energy input.

The latent heat of vaporization for water is about 2260 J/g at 100°C.

During vaporization, temperature remains constant until all liquid converts to gas.

Once vaporization is complete, additional energy increases steam temperature.

Boiling water undergoes phase change without temperature increase until all liquid becomes gas.

The skin feels a certain sensation from outside influences. The same thing that itches also detects hot, cold and sensations of other kinds. The technical term for it is stimulation of pruriceptors. When these pruriceptors are stimulated, the brain reacts with an appropriate response.

Question : Why do we itch. Why do we react the way we do?

i would say that we would like to remove the irritant as possible and once you have scratched the area of irritation and your likely going to find some relief with your finger nail scratched away the irritant then it gets sent to your brain saying it gone and your all good.

Hopefully that helps you ! have a good day !

First convert the 590.0 grams of water to liters of water.

590.0 grams x  (1 L / 1000 grams) = 0.59 L

Since we're dealing with concentration, recall this formula:

Molarity (M)  = (moles of solute) / (liters of solution)

We know the Molarity and the Liters

0.82 M = (moles) / 0.59 L

To find the moles multiply 0.59 on both sides.

The result is 0.4838 moles of CaCl (the solute).

Then change moles into grams because the question wants grams.

In order to convert the moles of a substance to grams, you will need to multiply the mole value of the substance by its molar mass which is 110.986.

(0.4838 moles CaCl2) x (110.986 g CaCl)/ 1 mol CaCl2

To produce a 0.82 m solution, dissolve 53.61 grams of anhydrous calcium chloride in 590.0 grams of water.

To solve this problem, we need to understand the concept of molarity and how to calculate the mass of a solute required to make a solution of a given molarity.

Molarity (M) is defined as the number of moles of solute (n) divided by the volume of the solution (V) in liters:

[tex]\[ M = \frac{n}{V} \][/tex]

To find the mass of the solute (m), we need to use the molar mass (Molar mass = molecular weight in g/mol) of the solute.

[tex]\[ \text{Molar mass of CaCl2} = \text{Atomic mass of Ca} + 2 \times \text{Atomic mass of Cl} \] \[ \text{Molar mass of CaCl2} = 40.08 \text{ g/mol} + 2 \times 35.45 \text{ g/mol} \] \[ \text{Molar mass of CaCl2} = 40.08 \text{ g/mol} + 70.90 \text{ g/mol} \] \[ \text{Molar mass of CaCl2} = 110.98 \text{ g/mol} \][/tex]

Now, we can rearrange the molarity equation to solve for the number of moles (n):

[tex]\[ n = M \times V \][/tex]

Now we can calculate the number of moles of CaCl2 needed for a 0.82 m solution:

[tex]\[ n = 0.82 \text{ M} \times 0.5900 \text{ L} \] \[ n = 0.4838 \text{ mol} \][/tex]

Finally, we can find the mass of CaCl₂ required by multiplying the number of moles by the molar mass:

[tex]\[ m = n \times \text{Molar mass of CaCl2} \] \[ m = 0.4838 \text{ mol} \times 110.98 \text{ g/mol} \] \[ m = 53.61 \text{ g} \][/tex]

Therefore, the mass of anhydrous calcium chloride that should be dissolved in 590.0 grams of water to produce a 0.82 m solution is approximately 53.61 grams.

DNA

all I had to do was just think back to middle school when I learned that

The basic cell is a neuron

Primary mirror is the bottom right space.

Secondary mirror is the left space.

Eyepiece is the top right space.

Hope this helps.

Answer:

Top box: eye piece.

2nd Box: Primary Mirror

Box closest to the bottom: Secondary Mirror

Explanation:

science

This is FALSE

The soil would be almost infertile after all the magma and heat. It cannot grow crops and plants will not be able to survive. It becomes 'baked' and therefore is very hard to grow ANYTHING

However after a period of time, the soil can make use of volcanic nutrients and grow lush plants (but this is after a while)

After a volcanic eruption, it is nearly impossible for plant life to grow due to the poor soil is a false statement.

A volcanic eruption is when lava and gas are released from a volcano—sometimes explosively.

After a volcanic eruption,the soil in this region is rich because volcanic eruption deposits the necessary minerals, which are then weathered and broken down by rain. Once absorbed into the soil, they become a steady supply of nutrients for plant life.

Hence, the correct answer is false.

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How is the number 8.697 x 10-5 expressed in regular numerals?  C. 0.08697

I believe the answer is A wind,it's not bio

C. garbage because most garbage is human made

When equal forces from opposite directions act on an object, they are said to be balanced. Such a state doesn't change the motion of the object, which aligns with Newton's First Law of Motion or The Law of Inertia.

Balanced forces occur when the total force applied to an object from one direction equates to the total force applying from the opposite direction. Hence, the object will remain still or continue moving at a constant speed in a straight line. It's important to note that under balanced forces, the motion state of the object doesn't change, also known as Newton's First Law of Motion or The Law of Inertia.

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B. Decomposers

Answer:

B

Explanation:

A gamma ray or gamma radiation, is a penetrating electromagnetic radiation arising from the radioactive decay of atomic nuclei. It consists of the shortest wavelength electromagnetic waves and so imparts the highest photon energy

penetrating electromagnetic radiation of a kind arising from the radioactive decay of atomic nuclei

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants

C.  

52° Celsius

Hope this helped!

The standard value for temperature T in the Nernst equation is 25°C (298 K). This temperature is commonly used since standard-state values in thermodynamics are typically listed at this temperature.

The standard value for T in the common form of the Nernst equation is 25°C, which is equivalent to 298 K. This value is often used because most thermodynamic tables list the standard-state values at 298.15 K (or 25° C), and it's a common assumption that reactions or processes are taking place under so-called 'room temperature' conditions.

The Nernst equation itself indicates that cell potential is dependent on concentration, and it fundamentally relates the voltage of an electrochemical cell to the concentrations of reactants and products at a given temperature.

Mass percentage is one way of representing the concentration of an element in a compound or a component in a mixture. To calculate percent by mass, you need to determine two things: the mass of just the element, and the molar mass of the whole compound. We calculate as follows:

.10 g NaCl / g NaCl + Water = ( 10.0 g NaCl + x ) / (10.0 g + 255 g + x )

x = 18.33 g NaCl needed

A yellow flame is produced by sodium

Blue,green,orange and red