please answer; i’ll give brain

Answer:Phosphorus ahs an ocxidation number of 3. Phosphoric acid, H3PO3 has structure where there is one hydrogen (-H), two hydroxyl groups (-OH) and one oxgen (=O) attached to the central phosphorus P

Using the normal rules, H= +1, O = -2, OH = -1 and balancing out the "charges" we get P =+3

Explanation:

Answer:

1 has the highest density because it has the most amount of circles in the least amount of space- it is the most densely filled with circles; it is the most dense.

Answer:

image 1 would have the highest density

Explanation:

the closer the molecules are the more solid an object is. if the molecules are far apart and rarely bump into eachother, it is more gaseous. the object in the middle (2) is a liquid

Answer/Explanation:

#1 - A pure substance is either an element or a compound, making it different from a mixture. A sample of matter that has specific chemical and physical properties is the only one that fits here.

#2 - A pure substance is either an element or a compound, making it different from a mixture. Water is a compound, and thus this would be true.

#3 - An atom is the smallest unit of an element that keeps the properties of that element. Just refer to its definition.

#4 - A molecule is two or more atoms held together by chemical bonds . Again, just refer to its definition.

#5 - A chemical bond is the attractive force that holds atoms together . Jus refer to its definition.

#6 - Molecules are most definitely not all the same size, especially given the huge number of them. This would be false.

#7 - A compound is a pure substance made up of two or more different types of atoms joined by chemical bonds . Just refer to its definition.

#8 - Compounds always form in a fixed ratio, so this would be false.

#9 - If by directly, the problem means with the naked eye, this would be true.

#10 - False. It's reversed.

#11 - A crystal is a substance in which the particles are arranged in an orderly, geometric, and repeating pattern . Just refer to its definition.

#12 -True; to be more specific, they are covalent network solids.

Answer:

a chemical change is correct answer

Answer:

In all of the ecoregions, wind and rain can weather and erode the landforms and soil. Rivers are also

powerful weathering and erosion agents. They can cut into rock and form canyons. When rivers deposit

eroded material, they change their shape or extend the shoreline. When waves along coastlines deposit

sediment, they extend beaches; when they wash sediment away, the waves erode beaches. Rivers, rock

formations, soils, topography, and precipitation in an ecoregion will determine how the processes of

weathering, erosion, and deposition work to reshape it.

Explanation:

Answer:

subsystems.

Explanation:

A self-contained system within a larger system. system. A group of interacting or interdependent elements forming a complex whole, as in all the factors or variables in an environment or all the variables that might affect a science experiment.

Answer its Ccccccccccccccccccccccccc

Answer:

B) fewer in number and less strongly held

Explanation:

If we  look closely at the periodic table from left to right, we will notice that the number of valence electrons increases steadily as we move across the periodic table from left to right.

Metals are mostly at the left hand side of the periodic table while nonmetals are found at the righthand side of the table.

Metals are less electronegative than nonmetals and typically have a lower effective nuclear charge than nonmetals hence the fewer valence electrons of metals are less strongly held(due to less effective nuclear charge) than those of nonmetals.

The volume of apple juice could  a diabetic person drink : 100 ml

Given

sugar allowance = 8 g

sugar concentration of apple juice : 8.0% w/v

Required

Volume of apple juice

Solution

The concentration of a substance can be expressed in several quantities The concentration shows the amount of solute in a unit of the amount of solvent.

% w/v = mass of solute (weight) in g / 100 ml solution

So for 8% w/v = 8 g of sugar(solute) in 100 ml of apple juice

Answer:

0.97 atm ≅ 1 atm

Explanation:

The relation between the pressure (P) and volume (V) of a gas is given by the Boyle's law. According to this, the volume is inversely proportional to the pressure:

P₁ x V₁ = P₂ x V₂

From the problem, we have:

V₁= 400.0 mL x 1 L/1000 mL = 0.4 L

P₁= 5.2 atm

V₂= 2.14 L

We calculate the final pressure (P₂) from the equation, as follows:

P₂ = (P₁ x V₁)/V₂ = (5.2 atm x 0.40 L)/ 2.14 L = 0.97 atm ≅ 1 atm

Therefore, as the volume is increased (from 0.4 L to 2.14 L), the pressure in decreased (from 5.2 atm to 0.97 atm).

A 400.0-mL can contains compressed gas at 5.2 atm. The gas is sprayed into a bag, that inflates to 2.14 L at 0.97 atm.

Boyle's law states that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature.

A 400.0-mL can contains compressed gas at 5.2 atm. The gas is sprayed into a bag, that inflates to 2.14 L. We can calculate the final pressure of the gas using Boyle's law.

P₁ × V₁ = P₂ × V₂

P₂ = P₁ × V₁ / V₂

P₂ = 5.2 atm × 0.4000 L / 2.14 L = 0.97 atm

where,

A 400.0-mL can contains compressed gas at 5.2 atm. The gas is sprayed into a bag, that inflates to 2.14 L at 0.97 atm.

Learn more about Boyle's law here: https://brainly.com/question/469270

Answer:

Moles of tin = 0.37 mol

Explanation:

Given data:

Mass of tin oxide = 50 g

Moles of tin = ?

Solution:

Number of moles of SnO:

Number of moles = mass/molar mass

Number of moles = 50 g/ 134.71 g/mol

Number of moles = 0.37 mol

We can see there is only one mole of Sn is present in one mole of tin oxide.

Thus in 0.37 mol  of tin oxide,

0.37 mol × 1 = 0.37 mol of tin

414 kJ energy is required to melt 2 kg of copper. Hence, option B is correct.

Energy is the capacity for doing work.

Given parameters:

Mass of copper  = 2kg

Unknown:

Amount of energy required to melt the copper  =?

Solution:

To solve this problem, we use:

Q  = m L

m is the mass

L is the latent heat of fusion of copper  = 207kJ/kg

So;

Q = 2 x 207  = 414kJ

Hence, option B is correct.

Learn more about energy here:

https://brainly.com/question/1932868

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Answer:

Law of conservation of matter

Explanation:

Answer:

simplest explanation regarding CO2 Molecular Geometry and hybridization. ... Carbon is the least electronegative that means it stays at the center

Explanation:

hope this helps

Answer:

Newton's laws are very important because they tie into almost everything we see in everyday life. These laws tell us exactly how things move or sit still, like why you don't float out of bed or fall through the floor of your house.

Explanation: Newton's laws of motion are important because they are the foundation of classical mechanics, one of the main branches of physics. Mechanics is the study of how objects move or do not move when forces act upon them.

Answer:

2 and 3 only

Explanation:

The formular for the compound; Silicon(IV)oxide is SO2

1. Silicon atoms form four single bonds in silicon(IV) oxide.

This statement is wrong because the silicon is doubly bonded to two oxygen atoms.

2. Oxygen atoms form two double bonds in silicon(IV) oxide.

This statement is correct.

3. Silicon(IV) oxide has a high melting point.

This statement is correct Due to it's macromolecular structure, it is able to form thousands of covalent bonds between it's sulphur and oxygen sub units.

4. Silicon(IV) oxide contains one silicon atom and four oxygen atoms.

This statement is wrong as silicon(iv) oxide contains only two oxygen atoms.

Answer:

4.226×10^8

Explanation:

4.2 ×10^8+2.6×10^6=422600000

or 4.226×10^8

Answer: 60.117 g

Explanation: [tex]1.5 mol Ca = \frac{40.078g/mol}{1mol}[/tex] multiply and quit all "mol" and you get the grams

Answer:

The required numerical set up is;

RAM = (19.78% * 10) + (80.22% * 11)

Explanation:

The relative atomic mass is the sum of the products of the mass of each isotope and its relative abundance.

Hence the relative atomic mass of Boron is obtained form;

RAM = (19.78% * 10) + (80.22% * 11)

RAM = (1.978) + (8.8242)

RAM =10.8022

Answer:

0.32 g

Explanation:

First, we find the number of moles n of silver deposited.

n = m/M where m = mass of silver deposited = 1.08 g and M = Atomic weight of silver = 108 g/mol

n = m/M = 1.08 g/108 g/mol = 0.01 mol

Now, the quantity of electricity Q = nF where n = number of moles of silver = 0.01 mol and F = Faraday's constant = 96500 C/mol

Q= nF = 0.01 mol × 96500 C/mol = 965 C

By the chemical equation for copper,

Cu²⁺ + 2e ⇒ Cu

2 moles of electrons deposits 1 mol of copper, that is

2 × 96500 C deposits 1 mol of copper, then 965 C will deposit x mol

x = 1 mol × 965 C/2 × 96500 C = 1/200 mol = 0.005 mol of copper

So, we find the mass of 0.005 mol of copper using

n = m/M where m = mass of copper deposited = unknown and M = Atomic weight of copper = 63.54 g/mol and n = number of moles of copper = 0.005 mol

m = nM

= 0.005 mol ×  63.54 g/mol

= 0.32 g

Answer:

9.033×10^23 Molecules

Explanation:

We are given,

No.of moles of water = 1.5 moles

The approximate value of Avagadro's Constant =6.022×10^23 particles

Hence,

As we know that,

No.of particles = No.of moles × Avagadro's Constant

Here,

No. Of Water Molecules in 1.5 moles of water = 1.5×6.022×10^23

No.of Water Molecules in 1.5 molesof water=9.033×10^23 Molecules

Answer:

Preach!

Explanation:

Answer:

it is an exothermic reaction

Answer:

λ = 0.1 nm

E = 2 × 10⁻¹⁵ J

Explanation:

Step 1: Given data

Frequency of X-rays (ν): 3 × 10¹⁸ s⁻¹

Step 2: Calculate the wavelength (λ) of a photon of X-rays

We will use the following expression.

c = λ × ν

where,

c: speed of light

λ = c / ν

λ = (3.00 × 10⁸ m/s) / 3 × 10¹⁸ s⁻¹

λ = 1 × 10⁻¹⁰ m × (10⁹ nm/1 m) = 0.1 nm

Step 3: Calculate the energy (E) of a photon of X-rays

We will use the following expression.

E = h × ν

where,

h: Planck's constant

E = 6.63 × 10⁻³⁴ J.s × 3 × 10¹⁸ s⁻¹

E = 2 × 10⁻¹⁵ J

Answer:

D, the cardiovascular system

Explanation:

The Cardiovascular System is the system at which blood circulates through our body

an expert in or student of meteorology; a weather forecaster.

Answer:

The longer it takes to orbit the sun.

Explanation: