HELP IN 8TH GRADE ADV SCIENCE

Answer:

Oxygen.

Explanation:

Oxygen is a chemical element that aides in the burning of materials and it is needed for humans to breathe.

Cellular respiration can be defined as a series of metabolic reactions that typically occur in cells so as to produce energy in the form of adenosine triphosphate (ATP). During cellular respiration, high energy intermediates are created that can then be oxidized to make adenosine triphosphate (ATP). Therefore, the intermediary products are produced at the glycolysis and citric acid cycle stage through the breathing of oxygen used to obtain energy from the food ingested.

Hence, all cells in living organisms require oxygen and glucose to release energy.

Answer:

160N

Explanation:

F = m × a

Where;

F = force (Newton)

m = mass (kg)

a = acceleration (m/s²)

According to this question, a 50kg car is pulling a 30kg car. This means that the total mass of the cars is 50kg + 30kg = 80kg

Hence, the force required to accelerate the cars at 2m/s² can be calculated this:

F = 80 × 2

F = 160kgm/s²

F = 160N

Answer:

I think it's unbalanced

(I'm so sorry if it's wrong)

Hope this helps!

Answer:

unbalanced

Explanation:

Answer:

Option 2

Explanation:

Answer:

3.97 x 10^-19 J

Explanation:

The energy E of a photon is given by:

       E = hf where h = Planck's constant = 4.14 × 10−15 eV · s and f = frequency

In this case, f = 6×10^14s−1, hence, the energy E of one photon of the light would be;

E = 4.14 × 10−15 eV · s x 6×10^14s−1

               =  2.484 eV

Note that:

1 eV = 1.60 × 10−19 J

Hence,

2.484 eV = 2.484 x 1.60 × 10−19 J

              = 3.97 x 10^-19 J

Answer:

90.4Kg

Explanation:

The energy required= latent heat of vaporization

Latent heat of vaporization of water= 2260 KJ/Kg

Mass of water = 0.04 Kg

Heat required= 0.04Kg× 2260 KJ/Kg

Heat required= 90.4Kg

Answer: The minimum number of kilo Joules needed is 90.4KJ.

Explanation:

The energy required= latent heat of vaporization.

Latent heat of vaporization of water= 2260 KJ/Kg

Mass of water = 0.04 Kg

Heat required= 0.04Kg× 2260 KJ/Kg

Heat required= 90.4KJ.

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Answer:

Mass = 83.33 g

Explanation:

Given data:

Number of atoms of neon = 2.486×10²⁴

Mass of neon = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

2.486×10²⁴ × 1 mol / 6.022 × 10²³ atoms

0.413×10¹ mol

4.13 mol

Mass of neon:

Mass = number of moles × molar mass

Mass = 4.13 mol × 20.18 g/mol

Mass = 83.33 g

Answer:

i think it's will difference from compund to compund

for me the pictures aren't clear

Answer:

Surface tension is a force that pulls particles at the exposed surface of a liquid toward other liquid particles. Surface tension explains why water forms droplets, like the water droplet that has formed on the leaky faucet pictured in the Figure below.

Answer:

2 A i covalent bond in hydrogen peroxide

ii ionic bond in potassium nitride

iii covalent bond in Aluminum sulphide

2 B i ionic bond in Fe3N2

ii covalent bond in C3F5

iii Ionic bond in Ca3P2

2c roman numerals represent oxidation state of that element.

Explanation:

Answer:

1) harm life forms that rely on carbonate-based shells and skeletons, 2) harm organisms sensitive to acidity

Explanation:

Answer:

Ocean acidification can negatively affect marine life, causing organisms' shells and skeletons made from calcium carbonate to dissolve.

Explanation:the more acidic the ocean, the faster the shells dissolve.

Answer: 3.613x10^24

Explanation: Avogadro’s number represents the number of atoms in one mole of substance: 6.022x10^23 atoms/mole. Multiplying the number of moles by this number reveals that, in this sample, 3.613x10^24 atoms of methane are present.

Answer: A

Explanation: When using dimensional analysis, always put similar unit-ed numbers diagnolly from each other so they 'cross out'

For example, If you had 1 mol of gold and you wanted to convert it to grams using gold's molar mass, 196.97 g/mol, it would look like this:

Start with the given number over nothing:

[tex]\frac{1 mol Au}{} *\frac{ }{ }[/tex]

Then add your conversion, in this case the molar mass, with the MOLES on the BOTTOM, so they are diagnol with the 1 mol of Au

[tex]\frac{1 mol Au}{ } *\frac{196.7 g Au}{1 mol}[/tex]

Always have the top right in your dimensional analysis be in the units that you are solving for. In this case, we went from moles to grams, so grams is in the top right.

Hope this helps!

Also, 6.02 x 10²³ is otherwise known as avogadros number- it is used when you are converting something from moles to molecules (or particles). For example, if instead we were going from moles of gold to molecules of gold, our dimensional analysis would look like this:

[tex]\frac{1 mol Au}{ } *\frac{6.02 x 10^2^3 molecules Au}{1 mol}[/tex]

Answer:

[tex]\boxed {\boxed {\sf About \ 3.53 \ *10^{24}atoms \ Co}}[/tex]

Explanation:

To convert from grams to atoms:

1. Convert grams to moles

First, find the molar mass of cobalt using the Periodic Table of Elements.

Next, use this mass as a ratio or fraction.

[tex]\frac{58.93319 \ g\ Co}{1 \ mol \ Co}[/tex]

Multiply the mass of the given sample (345 grams) by this ratio.

[tex]345 \ g \ Co *\frac{58.93319 \ g\ Co}{1 \ mol \ Co}[/tex]

Flip the fraction so the grams of Cobalt will cancel each other out when multiplying.

[tex]345 \ g \ Co *\frac{1 \ mol \ Co}{58.93319 \ g\ Co}[/tex]

[tex]345 \ *\frac{1 \ mol \ Co}{58.93319 }[/tex]

[tex]\frac{345 \ mol \ Co}{58.93319 } =5.854086636 \ mol \ Co[/tex]

2. Convert moles to atoms

Use Avogadro's Number, which tells us the number of units (in this case atoms) in 1 mole.

Use this number as a ratio or fraction.

[tex]\frac{6.022 * 10^{23} \ atoms \ Co}{1 \ mol \ Co}}[/tex]

Multiply this ratio by the number of moles we found.

[tex]5.854086636 \ mol \ Co*\frac{6.022 * 10^{23 }\ atoms \ Co}{1 \ mol \ Co}}[/tex]

The moles of Cobalt will cancel.

[tex]5.854086636 \ *\frac{6.022 * 10^{23 }\ atoms \ Co}{1 }}[/tex]

[tex]5.854086636 \ *{6.022 * 10^{23 }\ atoms \ Co}[/tex]

[tex]3.52533097*10^{24} \ atoms \ Co[/tex]

3.Round

The original measurement of 345 has 3 significant figures (3, 4, and 5). We must round to 3 sig figs, which is the hundredth place for this measurement.

[tex]3.52533097*10^{24} \ atoms \ Co[/tex]

The 5 in the thousandth place tells us to round the 2 to a 3.

[tex]3.53 \ *10^{24}atoms \ Co[/tex]

There are about 3.53*10²⁴ atoms of cobalt in 345 grams.

The area of a triangle : 25 m²

Given

A triangle. base(B) = 5 meters height(H) = 10 meters

Required

The area

Solution

The area of triangle can be formulated :

[tex]\tt A(area)=\dfrac{1}{2}\times base\times height[/tex]

Input the value :

[tex]\tt A=\dfrac{1}{2}\times 5\times 10\\\\A=25~m^2[/tex]

Explanation:

Weathering occurs one of three ways: through physical processes such as freezing and thawing, because of live organisms whose roots break rocks or through chemical processes that occur when carbon dioxide in the soil and air and mixes with water and specific minerals in rocks to form a weak acid that reduces rocks into silt, soil and sediment.

Chemical weathering typically increases as temperatures rise and rain falls, which means rocks in hot and wet climates experience faster rates of chemical weathering than do rocks in cold, dry climates.

Answer:

50 mph

Explanation:

Answer:

5 miles per hour

Explanation:

TRUST ME

Answer:

0.84 moles of oxygen are required.

Explanation:

Given data:

Mass of CO₂ produced = 37.15 g

Number of moles of oxygen = ?

Solution:

Chemical equation:

C + O₂     →     CO₂

Number of moles of  CO₂:

Number of moles = mass/molar mass

Number of moles = 37.15 g/ 44 g/mol

Number of moles = 0.84 mol

Now we will compare the moles of oxygen and carbon dioxide.

                          CO₂         :       O₂  

                              1           :         1

                            0.84       :       0.84

0.84 moles of oxygen are required.

Answer:

d

Explanation:

A sound wave involves the movement of energy from one location to another, not the ... TRUE OR FALSE: In order for John to hear Jill, air molecules must move from the ... Ocean waves can only bring energy to the shore; the particles of the medium ... a. mechanical b. electromagnetic c. transverse d. longitudinal. Answer: D

Answer:

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Explanation:

Answer:

Because sodium is on the left side of the PT and phosporus is on the right side. And atomis radius decreases from left to right.

Explanation:

Answer:

no it is not

Explanation:

Answer:

The SMRs can adjust their energy output using coolants and control rods.

Power plants can be built to fit locations with less demand or less space.

Explanation:

I think that it is but I am not sure.

Power plants can be built to fit locations with less demand or less space. The SMRs can adjust their energy output using coolants and control rods. The correct options are B and D.

A wireless communications technology that competes with traditional cellular services. The base station equipment supplier is the transmitter licensee in an SMR system.

Power plants can be built to accommodate locations with low demand or limited space. Coolants and control rods allow SMRs to adjust their energy output.

These advanced reactors, which are expected to range in size from tens to hundreds of megawatts, can be used for power generation, process heat, desalination, or other industrial applications.

Light water or other non-light water coolants, such as a gas, liquid metal, or molten salt, may be used as a coolant in SMR designs.

Thus, B and D are correct options.

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Answer:

*Ions

*Cation

*Anion

*Monoatomic ion

*Electrostatic forces

Answer:

B

Explanation:

a chemical change is where two chemicals come in to create a new chemical

Answer:

A change in a substance with no new substances being formed

Explanation:

you're welcome

Answer:

PLEASE MARK AS BRAINLIEST!!

Explanation:

Apply rubbing alcohol, hairspray, or hand sanitizer to dilute the stain, making it easier to remove during the wash. These solvents help tackle most types of ink stains, but remember to test the stained garment for colorfastness first, as they can also attack fabric dyes and cause further damage.

Answer:

A mixture of immiscible liquids is separated by using an apparatus called separating funnel. (i) Separation by fractional distillation : Fractional distillation is the process of separating two (or more) miscible liquids by distillation, the distillate being collected in fractions boiling at different temperatures.

Explanation:

hope this sorta helps you -.-

Answer:

❤C. A liquad becomes a solid❤

Explanation:

✌When you freeze water its a scientific fact that it becomes solid.✌