What is the name of the element represented in the model?
O A. Beryllium
B. Boron
O C. Oxygen
O D. Flourine

Answer:

There are 15 protons in phosphorous.

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Explanation:

pressure is Force/area

30000/0.75

Answer:

Q = 306 kJ

Explanation:

Given that,

Mass, m = 60 kg

Specific heat, c = 1020 J/kg°C

The temperature changes from 20°C to 25°C.

Let Q be the change in thermal energy. The formula for the heat released is given by :

[tex]Q=mc\Delta T[/tex]

Put all the values,

[tex]Q=60\times 1020\times (25-20)\\\\Q=306000\ J\\\\or\\\\Q=306\ kJ[/tex]

So, 306 kJ is the change in thermal energy.

Answer:

The correct answer is number 2. Elliptical, Spiral, Irregular.

Explanation:

Unfortunately, you did not attach the passage. Without the passage, we do not know what its content is.

So we are going to answer this question with our own knowledge.

The types of galaxies by their ability to form new stars, from most to least activity are "Elliptical, Spiral, Irregular."

That is the way astronomers classify galaxies in scientific terms. These scientists consider that the smallest galaxies or dwarf galaxies have approximately 100 million stars. On the other hand, giant galaxies have billions or trillions of stars. That immense is our universe.

Scientists still studying the universe and the galaxies to understand the way galaxies are formed.

Explanation:

A matchstick has a lot of chemical energy stored in it. When the match is struck, it burns and the chemical energy in it produces heat energy and light energy.

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Answer:

A

Explanation:

The letter A is the correct answer

Answer:

C7H6O2

Explanation:

Let;

68.8% of Carbon represents 68.8g

4.95% of Hydrogen represents 4.95g

26.25% of Oxygen represent 26.25g

Next, we convert each gram value to mole value by dividing by their respective molar mass {C = 12, H = 1, O = 16}

C = 68.8/12 = 5.73 mol

H = 4.95/1 = 4.95 mol

O = 26.25/16 = 1.64 mol

Next, we divide each mole value by the smallest (1.64mol)

C = 5.73 ÷ 1.64 = 3.49

H = 4.95 ÷ 1.64 = 3.02

O = 1.64 ÷ 1.64 = 1

Next, we multiply each ratio by 2 to obtain our simplest whole number ratio (empirical formula)

C = 3.5 × 2 = 7

H = 3.02 × 2 = 6

O = 1 × 2 = 2

Hence, the ratio of C, H and O is 7:6:2 and the empirical formula of benzoic acid is C7H6O2

Answer:

No. Light is not a physical thing, so it cannot change physical things like glue.

Explanation:

Light is not effective at all to glue, it doesn't do anything at all.

Hello there!

The solute is salt, and the solvent is water. So the answer is #1.

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Answer:

0.000236

Explanation:

Move the decimal point 4 times to the left of its original position

Answer:

OK

Explanation:

OK

Answer:

This is called combination reaction

Answer:

they reduce viral transmission

They prevent asymptomatic spread

You're protecting others from illness.

They're mandated by law in some states

They're good hygiene in general

Answer:

Amplification

Explanation:

Answer:

Acid is a kind of chemical compound that when dissolved in water gives a solution with H+ ion activity more than purified water. A base is an aqueous substance that donates electrons, accept protons or release hydroxide (OH-) ions. An acid is a proton donor. While a base is a proton acceptor.

Explanation:

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Answer:

Hi ,

Answer :

Sulfuric acid

Answer: Yes F is also correct.

Explanation:

Answer:

kinetic energy possessed by Ceres = 4.806 × 10^(29) J

Explanation:

We are given;

Estimated mass; m = 3 × 10^(21) kg

Orbital speed; v = 17900 m/s

Formula for kinetic energy is;

K.E = ½mv²

K.E = ½ × 3 × 10^(21) × 17900²

K.E = 4.806 × 10^(29) J

Thus;

kinetic energy possessed by Ceres = 4.806 × 10^(29) J

Answer:

b) velocity.

c) velocity, m/s²

d)change in velocity, change in direction, change in both velocity and direction.

e) increasing or decreasing

Answer:

B: There are only so many ways matter can arrange itself within that infinite universe.

The idea of a parallel universe was supported by Brian Greene on the basis that there are only so many ways matter can arrange itself within that infinite universe.

Matter is anything that has mass and occupy space. The universe as we know it is filled with matter. The theory of multiple universe holds that there could be another universe apart from this one that we know.

This theory was supported by Brian Greene on the basis that there are only so many ways matter can arrange itself within that infinite universe.

Learn more about universe: https://brainly.com/question/9904853

Answer:

ΔHr = -566kJ/mol

Explanation:

Based on Hess's law, the ΔH of a reaction is the sum of the ΔH's of products times its coefficient subtracting the ΔH of reactants. For the reaction:

2CO(g) + O2(g) → 2CO2(g)

ΔH is:

ΔHr = 2*ΔH CO2 - (2ΔH CO + ΔH O2)

As ΔH CO2 = -393.5kJ/mol; ΔH CO = -110.5kJ/mol and ΔH O2 = 0kJ/mol

ΔHr =  2*-393.5kJ/mol - (2*-110.5kJ/mol)

Water cannot dissolve all substances that are made from ionic bonds probably because some ionic bonds are too strong for the attractions of water molecules to pull them apart.

However, some ionic bonds formed from ions of elements are unable to be dissolved by water and this is probably attributed to the fact that those bonds are too strong to be pulled apart by water molecules.

Learn more about at ionic compounds at: https://brainly.com/question/9167977

Explanation:

a.Silver chloride

b.zinc Oxide

c.calcium Bromide

d.strontium difluoride