Uranium -235 is used in nuclear fission. determine the number of protons and neutrons in uranium -235

A:This atom is very likely to bond with another atom.

B:This atom is only slightly likely to bond with another atom

C:This atom is not likely at all to bond with another atom.

And I Think The Answer Is A

The heat lost by the metal should be equal to the heat gained by the water. We know that the heat capacity of water is simply 4.186 J / g °C. Therefore:

100 g * 4.186 J / g °C * (31°C – 25.1°C) = 28.2 g * Cp * (95.2°C - 31°C)

Cp = 1.36 J / g °C

Answer:

Physical change

Explanation:

A physical change is a reversible change in the physical properties of a substance.

Let’s look at an example:

Water. Water is made up of 2 hydrogen atoms and one oxygen atoms, H2O.

When the temperature of water decreases, the particles slow down and the liquid turns to ice. When it turns to ice, is it still H2O? Yes! When water changes states, it’s just a physical change. The chemical properties of water DO NOT change!! It’s physical change because when you melt ice, it can goes back to its original form: liquid (water). It can be reversed!

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Here are some examples of ways to cause physical changes:

The change that can be easily reversed is a physical change, because it doesn't alter a substance's basic identity - it just changes its form. This is unlike chemical changes, which fundamentally alter a substance and thus cannot be easily reversed.

The change that can be easily reversed is a physical change. This is because physical changes don't alter the basic identity of the substance - they just change its form. For example, when you melt ice into water, that's a physical change because the water is still H2O, just in a different state. If you put it back in the freezer, it can change back into ice. This is unlike a chemical change, such as burning wood into ash and smoke. In this case, the wood can't be changed back into its original form because its chemical properties have been altered.

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Answer:

sulfur

Explanation:

The percentage error for the mass measurement is 16.5%.

To calculate the percentage error, we use the formula:

Percentage Error = (|Measured Value - Actual Value| / Actual Value) x 100%

In this case, the measured value is 17.7g and the actual value is 21.2g. Plugging in these values into the formula, we get:

Percentage Error = (|17.7g - 21.2g| / 21.2g) x 100% = |3.5g| / 21.2g x 100%

Since the absolute value of 3.5 is equal to 3.5, the percentage error is:

Percentage Error = (3.5g / 21.2g) x 100% = 16.5%

Answer:

Mechanical energy

Explanation:

Mechanical energy is a result of kinetic energy plus potential energy of an atom due to the motion of electrons. As the electrons move away from the nucleus, that is to the outer orbitals the potential energy increases, and as the electrons move inward towards the nucleus the kinetic energy increases.

To find the number of molecules in a given amount of substance, use Avogadro's number. The mass of a given number of moles can be calculated by multiplying the number of moles by the molar mass.

To determine the number of molecules in a given amount of substance, we can use Avogadro's number. Avogadro's number is approximately 6.022 × 1023 and represents the number of particles in one mole of a substance.

For example, in 1.30 mol of O2, there would be 1.30 × 6.022 × 1023 molecules of O2.

To find the number of molecules in the other given amounts, you can use the same approach.

The mass of 3.64 mol of iron (Fe) can be calculated by multiplying the number of moles by the molar mass of iron. The molar mass of iron is approximately 55.85 g/mol, so the mass of 3.64 mol of iron would be 3.64 × 55.85 g.

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Answer is: Block 2 is the least dense.

d(metal) = m(metal) ÷ V(metal).

Volume is the same for all metals, so density only depends on mass of the block of the metal.

Smaller the mass of the block, smaller is the density:

d(block 1) = m(block 1) ÷ V.

d(block 1) = 65 g/V.

d(block 2) = 32 g/V.

d(block 3) = 100 g/V.

d(block 4) = 79 g/V.

Helium is the second lightest element and the lightest monatomic element in its natural state. It is part of the noble gases, inert and does not react with other elements, and has various applications due to its low density.

Helium is a colorless, odorless, and tasteless element that is found naturally in the gas state. It is known for being the second most abundant element in the universe and the lightest monatomic element. A helium atom consists of a nucleus with 2 protons and usually 2 neutrons and is enveloped by 2 electrons, resulting in a complete valence shell making it chemically inert. Helium has an atomic number of 2, making it the second element in the periodic table right after hydrogen, which is the first and simplest element having only one proton and one electron and generally forms H₂ molecules. Contrary to helium, hydrogen is the lightest gas overall since it forms diatomic molecules. Nonetheless, if we consider single atoms, then helium atoms are indeed heavier than hydrogen atoms.

Helium's unique characteristics such as its low boiling point, low density, and lack of chemical reactivity arise from its filled electron shell, where no further electrons can be added. These properties make helium a noble gas and it is placed at the top of this group in the periodic table. Its low density of only 0.164 g/L at 25°C and 1 atm pressure also makes helium ideal for applications such as filling balloons.

Particles move independently of one another and are widely spaced.

The mass of 0.28 mol of iron is 15.638 grams.

To find the mass of 0.28 mol of iron, we need to use the molar mass of iron. The molar mass of iron, as given in the periodic table, is 55.85 g/mol. This means that 1 mole of iron weighs 55.85 grams.

Step-by-Step Calculation:

1. Find the molar mass of iron:

2. Calculate the mass of 0.28 mol of iron:

So,

Therefore, the mass of 0.28 mol of iron is 15.638 grams.

Final answer:

According to Dalton's atomic theory, when elements react, their atoms combine in simple whole number ratios to form chemical compounds. In chemical reactions, atoms can be combined, separated, or rearranged, but they are neither created nor destroyed.

Explanation:

According to Dalton's atomic theory, when elements react, their atoms combine in simple whole number ratios to form chemical compounds. In chemical reactions, atoms can be combined, separated, or rearranged, but they are neither created nor destroyed. This means that the number of atoms in the reactants is equal to the number of atoms in the products.

Given an average seawater salinity of 35ppt (parts per thousand), the amount of dissolved salts in 500g of seawater is calculated to be 17.5g.

The average salinity of seawater is given as 35ppt, which stands for parts per thousand. This means that for every 1000g of seawater, there are 35g of dissolved salts. Therefore, to find out how many grams of dissolved salts are in 500g of seawater, we need to set up a proportion.

Start by writing the given proportion: 1,000g seawater / 35g salt = 500g seawater / X g salt. Solving for X gives us the equivalent grams of salt in 500g water. X is calculated by cross-multiplying 35g by 500g and dividing the result by 1,000g. The calculation should look like this: (35g * 500g) / 1,000g = 17.5g.

So, 500g of seawater contains 17.5g of dissolved salts.

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Answer: D) The effect of gravity on an object

Explanation: We're not talking about mass, we're talking about weight. Weight is measured by the force of gravity on a object. For examples, you might be 100 pounds on Earth but 12 pounds on the moon.

I have the same assignment rn witht he graph but i only have 4 points plotted and connected by lines am i doing it wrong plzzz???

The air temperature would drop quickly compared to the soil because the difference between solid and gas. But the ground will stay cooler longer than the air because it contains it better than the air.

Answer:

4

Explanation:

Si has atomic number 14 so the electronic configuration 2,8,4

Valence electrons of Si and C are shared in covalent bonding.

In a covalent bond, valence electrons are shared between atoms. The number of valence electrons an element has determines how many covalent bonds it can form. For example, carbon (C) has 4 valence electrons, so in a covalent bond, these 4 electrons are shared with other atoms.

Similarly, silicon (Si) also forms covalent bonds by sharing its valence electrons. Silicon has 4 valence electrons like carbon, so it can form 4 covalent bonds as well.

Answer:

No, Water boils faster at higher altitudes.

Explanation: