Can y’all please help me this is due tomorrow

Answer:

the answer is 28.086amu

Explanation:

There are three isotopes of silicon. They have mass numbers of 28, 29 and 30. The average atomic mass of silicon is 28.086amu. sorry it took me so long.

Answer: False

Explanation: The plate tectonics  move due to convection currents of the mantle; the cooler upper mantle descends while the hotter lower mantles ascend. The heat that drives these convection currents emanated from the core of the earth (not the sun).

Answer:

i think its going to be liquid

Explanation:

Maybe this information is helpful:

The features of the ocean floor are not permanent, and are gradually changing over time due to the movement of tectonic plates. Most of the ocean floor features from close to where the plates are shifting either towards or away from each other. Marine ecosystems are found around parts of the ocean floor features, even the Mariana Trench, which is the deepest trench in the world.

Answer: ummm what is this cause I don't get it either

Explanation:

i need help with this to lol

Answer:

Cobalt was the first metal to be discovered since prehistoric times and the first metal with a recorded discoverer.

Cobalt-60 is used to create gamma rays which are used to treat cancer and to sterilize medical supplies.

Cobalt is one of only three naturally occurring magnetic metals, making it very useful for the uniquely calibrated magnets found in generators and hard drives. ...

Cobalt has been utilized by man for at least the last 2,600 years, providing blue pigments for glassware and ceramics.

Explanation:

Answer:

- Doesn’t exist naturally on earth.

- Isolated in 18th century

- we use cobalt for magnets

- isn’t rare

Explanation:

The higher its electronegativity, the more an element attracts electrons. The atom with higher electronegativity, typically a nonmetallic element, is assigned a negative oxidation number, while metallic elements are typically assigned positive oxidation numbers.... Hope it is useful brainliest plz if it was useful....

The relationship between electrons and oxidation number has bee the negative oxidation number implies the gain of the electron, while positive oxidation number implies the loss of electron by elements.

The oxidation number has been defined as the number of electrons lost or gained by an element to form a chemical bond. The elements that lose electrons are assigned positive oxidation number.

The elements that gain electrons to form a chemical bond are assigned a negative oxidation number.

The relationship between electrons and oxidation number has bee the negative oxidation number implies the gain of the electron, while positive oxidation number implies the loss of electron by elements.

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Answer:

The answer is Iron phosphide (Fe2P)

Answer:

[HNO₃] = 3.14 N

Explanation:

Relacionando normalidad con molaridad, ydado que el HNO₃ tiene solo un protón, ambas van a coinicidir asi que calculando la molaridad, será lo mismo decir que ese valor pertenece a la concentración normal.

Densidad de solución = 1.1 g/mL

Volumen de solución = 5L = 5000 mL

Masa de solución = 1.1 g/mL . 5000 mL = 5500 g

Ahora usamos el % p/p.

Si sabemos que en 100g de solución hay 18 g de soluto

En 5500 g de solución tendremos (5500 . 18) /100 = 990 g

Convertimos a moles = 990 g . 1mol /63g = 15.7 moles

Como el volumen de solución es 5L = 15.7 mol /5L = 3.14 M = 3.14N

Basicamente para calcular la normalidad hay que saber calcular los equivalentes de soluto los cuales se expresan como

masa de soluto / Equivalentes gramo, donde los equivalentes gramo se definen como el peso molecular /valencia. En este caso como el acido nitrico es monoprótico, la valencia es 1, y haciendo el procedimiento usando densidad de solución y el % peso en peso, ya sacamos la masa de soluto.

990 g / 63g/mol / 1 = 15.7 Equivalentes

N = Equivalentes/L de solucion → 15.7 Eq /5 L = 3.14N

The normality is 3.14 N

Given that the Density of solution = 1.1 g/mL

Volume = 5L = 5000 mL

So, Mass of solution = 1.1 g/mL . 5000 mL = 5500 g

Now we use % w/w.

Given that in 100g of solution there is 18 g of solute

Hence 5500 g of solution contains

(5500 . 18) /100 = 990 g of solute  

As the volume of the solution is 5L, to calculate the normality of the solution

N =  Mass of solute in grams/(volume of solution in litres × Equivalent weight)

Equivalent weight = molar mass/ number of hydrogen ions

here the number of H ions = 1

hence, equivalent weight = 63/1 = 63

The Normality is 990/(5×63) = 3.14N

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Answer:

kilograms x meters2/seconds2

Explanation:

Answer:

kilograms x meters2/seconds2

Explanation:

Answer:

South of San Bernardino has more earthquakes because they have about 10,000 in a year but Cajon has about 160 earthquakes in a year therefore south San Bernardino earthquakes most didnt really damage places so 100 plus magnitude of 3.0 and only 15-20 are greater magnitude of 4.0. Cajon has less earthquakes a year and not big magnitude damages as South of San Bernardino so as you can see here we have South of San Bernardino earthquakes rising each and every year.

Explanation:

I gave the answer i will do it once more :))

Answer:

D

Explanation:

beacause all the elements in period 3 has different valence electrons hence you look at the first element in period 3 is sodium which has a valence electron of 1 when you go across the period to the right their valence electron decreases to be negative

Answer:

D is the correct answer i hope this is correct

Answer:

Explanation:

Since salt is composed of two ions Na+ and Cl- it will attract to the opposite poles of the water and form a ion-dipole bond. This will cause the phenomenon freezing point depression where as the name states it will take a lower tempertature to freeze it. So instead of freezing at 0 degrees c it will freeze at a negative 2 or so on.

The salt ions end up slowing the growth of ice as the water molecules re-freeze.

Freezing point depression can be defined as the decreasing of the freezing point of pure solvents upon the addition of different kinds of solutes.

Depression in the freezing point can be defined as a colligative property that is proportional to the molality of the solution.

As liquid water gets colder and colder, the motions of water molecules become slower and slower. When salt is added to water, the saltwater solution is composed of both water molecules and dissolved salt ions.

As a result, salt ions can easily replace some of the water molecules. Saltwater freezes more slowly than pure water due to many of the water molecules would be "crashing" into the ice's surface in pure water and are replaced by salt ions.

Therefore, the salt water will freeze at a lower temperature than the pure water.

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Explanation:

An emulsion is a suspension of two liquids that actually do not mix together.these liquids that do not mix are said to be immiscible .an example :-

would be oil and water.lf you mix oil and water and shake them a cloudy suspension is formed

this is correct answer

I hope it's helpful for u....

The pine tree that produced the seed would be the only parent of a pine seed that was formed through self-pollination. So, the correct option is A.

In the process of self-pollination, pollen from one flower or plant fertilizes the egg cells of another flower or plant. For self-fertilization to occur, both male and female reproductive components must be present within the same flower or plant.

The pollen from the male flower component, the anther, is carried to the female component, the stigma, during self-pollination either by the wind or by pollinators like bees, butterflies, or birds.

A pine tree that produces seeds will be the sole parent of pine seeds that form through self-pollination. Self-pollination occurs when pollen from the same pine tree fertilizes the pine tree's own egg cells, producing seeds with the genetic makeup of only one individual.

Therefore, the correct option is A.

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Answer:

Three pairs of walking legs, wings, body divided into three segments, pair of sensory antennae.

Explanation:

Answer:

This is not a chemical change

Explanation:

The dark green solution mixed with the water, but the water is still water. There were no bubbles, smell, temperature change, or any other signs of a chemical change

Have a great day!

A student mixes a dark green solution with water, and the result is pale green. This is a physical change.

Composition distinguishes a physical change from a chemical change. A physical change is a difference inside the look, smell, or straightforward presentation of a material sample without the need for a change in composition, whereas a chemical change alters the makeup of the substances in issue.

Despite the fact that we refer to them as physical "reactions," nothing is actually changing. A change in the substance in question's elemental composition is necessary for a reaction to occur. So, from now on, we will simply refer to bodily "reactions" as physical changes. A student mixes a dark green solution with water, and the result is pale green. This is a physical change.

Therefore, a student mixes a dark green solution with water, and the result is pale green. This is a physical change.

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Answer:

the environmental benefits of rain water harvesting

Explanation:

rainwater harvesting can reduce stormwater runoff a property by reducing stormwater runoff rainwater harvesting can reduce is term peak flow volume and velocity in local cricket stream and rivers thereby reducing the potential for stream Bank erosion

Answer:

The Earth

Explanation:

Answer:

The Earth

Explanation:

Geothermal energy comes from the sub surface of the Earth. It is contained in the rocks and fluids beneath the earth's crust and can be found as far down to the earth's hot molten rock, magma.

Answer:

its is true because i think its true???

Explanation:

I just answer on a different account

Answer:

True

Explanation:

The bigger mass is measured in kilograms and smaller in grams

Answer:

Polymers

Explanation:

Answer:

The air pressure in tires increases as the temperature goes up. Scientists have figured out that for every 10 degrees (Fahrenheit) that the temperature rises the tire pressure will increase by one pound per square inch

Explanation:

Answer:

decrease

Explanation: