1. What keeps a star from breaking apart ?

Answer:

One serving is 1/4 cup therefore 1 cup would be 4 servings. Since we have 9 cups we would then multiply 9 x 4 and the answer would be 36 servings. You have a ratio of cups to serving, so 1/4 cup : 1 serving, or .

Explanation:

Answer:

Each molecule of HCl is composed of a one-to-one ratio of hydrogen and chlorine.

Explanation:

At room temperature, HCl is a colorless, poisonous gas. Dissolve it in water, and, voilà, you have hydrochloric acid. For the record, acids are substances that release hydrogen ions in water. The more hydrogen ions an acid releases in water, the stronger the acid (see "What is an ion?" below). If you concluded from the above discussion that HCl releases many hydrogen ions in water, you are right!

The ratio of atoms in HCl is

The ratio of atoms in hydrogen chloride shortened as HCl is 1:1. This is because there is only one atom of hydrogen that is reacted with another atom of chlorine. A ratio indicates the relative sizes of two or more quantities.

When given another compound like H₂ SO₄, we can describe the elements as being in the ratio of 2:1:4. Thus, we can see the relative quantities of the individual elements in the given compound.

In conclusion, the ratio of atoms in HCl is 1:1.

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Answer:

The average velocity of the airplane for this trip is 1684.21 km/h

Explanation:

Average velocity is the rate of change of displacement with time. That is,

Average velocity = [tex]\frac{Displacement }{Change in time}[/tex] = Δx / Δt = [tex]\frac{x2 - x1}{t2 - t1}[/tex]

Now we will calculate the time taken by the airplane for the first motion before it encounters a wind.

From,

Velocity = [tex]\frac{Distance traveled}{Time taken}[/tex]

Time = [tex]\frac{Distance traveled}{Velocity}[/tex]

Therefore, Time = [tex]\frac{2100km }{1000km/h}[/tex]

Time = 2.1h

This is the time taken before the airplane encounters a wind.

Hence, t1 = 2.1h

Now, For the time taken by the airplane when it encounters a wind

Also from,

Velocity = [tex]\frac{Distance traveled}{Time taken}[/tex]

Time = [tex]\frac{Distance traveled}{Velocity}[/tex]

Therefore, Time = [tex]\frac{1300km }{800km/h}[/tex]

Time = 1.625h

Hence, t2 = 1.625h

Now, to calculate the average velocity

Average velocity = [tex]\frac{x2 - x1}{t2 - t1}[/tex]

x1= 2100, x2= 1300, t1= 2.1h and t2= 1.625h

Hence, Average velocity = [tex]\frac{1300 - 2100}{1.625 - 2.1}[/tex]

Average velocity = 1684.21 km/h

Answer:

hope it helps!!!!!!!!!!!!!!!!!!!!!

Explanation:

An ionic compound is made up of charged particles, called ions. It has a giant lattice structure with strong electrostatic forces of attraction.

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Answer:

Number of protons = 52, Number of electrons = 52, Number of neutrons = 76

Explanation:

Answer:

THE PERCENT ERROR IS 5.55 %

Explanation:

To calculate the percent error, we use the formula:

Percent error = Found value - accepted value / accepted value * 100

Found value = 2.85 g/cm3

Accepted value = 2.70 g/cm3

Solving for the percent error, we have:

Percent error = 2.85 g/cm3 - 2.70 g/cm3 / 2.70 g/cm3 * 100

Percent error = 0.15 / 2.70 * 100

Percent error = 0.05555 * 100

Percent error = 5.55 %

In conclusion, the percent error is 5.55 %

Answer:

I think B

Explanation:

Answer:

Anode

Explanation:

Answer: How do contrasting colors affect the quality of a painting

Answer:

The answer is D.

Explanation:

I just took the test. :)

Answer:

Scientific Question: ... I will boil water and add a substance like salt to see if the boiling point increases.

Answer: d collect the data

Explanation:

Collecting the data and making observations comes right before the "analyzing the data" step of the scientific method. Therefore, option (D) is correct.

The scientific method can be described as an empirical method for acquiring knowledge that has developed in science since at least the 17th century.  

The scientific theory includes careful observation, applying what is observed, given that assumptions can distort how one interprets the observation. . A scientific hypothesis is possible to identify a possible outcome of an experiment that conflicts with predictions deduced from the hypothesis.

The scientific theory involves hypotheses, through induction, based on such observations, the testability of hypotheses, experimental and measurement-based statistical, and elimination of the hypotheses based on the experimental findings.

The process in the scientific method includes making hypothetical explanations, and predictions from the hypotheses as logical consequences and then conducting experiments or empirical observations based on those predictions.

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Answer:

Melting and boiling point

Explanation:

For all group 1 elements, the melting and boiling point of the various members of the group decreases down the group. Hence, as the elements become heavier, they tend to have lower melting and boiling points.

Thus in moving from lithium to francium, there is a steady decrease in the melting and boiling points of elements down the group.

Answer:

Gold, silver and sodium.

Explanation:

Gold, silver and sodium are the name of the elements which does not match to their abbreviation. It is because those names are comes from other language. For example, the symbol of sodium is Na which comes from Natrium that is a Latin word. The symbol of gold is Au which comes from Aurum that is also a Latin word. The symbol of silver is Ag which comes from a Latin word i. e. Argentum.

Answer and Explanation:

Bohr's model of the atom defined the electron as a particle that orbits around the nucleus in only certain orbital levels. As a result, it couldn't readily give account of the energy levels of larger elements with high atomic number.

The quantum model of the atom however, approaches the electron in an atom as not just a particle but a wave, with its distinct quantum number per energy level. It can therefore give the position and speed of an electron simultaneously at any energy level.

I hope this explanation is sufficient.

Answer:

Option D. KBr < KCl < NaCl

Explanation:

We'll begin by calculating the number of mole of each sample.

This can be obtained as follow:

For NaCl:

Mass = 1 g

Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol

Mole of NaCl =?

Mole = mass /Molar mass

Mole of NaCl = 1/58.5

Mole of NaCl = 0.0171 mole

For Kbr:

Mass = 1 g

Molar mass of KBr = 39 + 80 = 119 g/mol

Mole of KBr =?

Mole = mass /Molar mass

Mole of KBr = 1/119

Mole of KBr = 0.0084 mole

For KCl:

Mass = 1 g

Molar mass of KCl = 39 + 35.5 = 74.5 g/mol

Mole of KCl =?

Mole = mass /Molar mass

Mole of KCl = 1/74.5

Mole of KCl = 0.0134 mole

Summary

Sample >>>>>>>> Number of mole

NaCl >>>>>>>>>> 0.0171

KBr >>>>>>>>>>> 0.0084

KCl >>>>>>>>>>> 0.0134

Arranging the number of mole of the sampl in increasing order, we have:

KBr < KCl < NaCl

All of the measurements have 4

The number of significant figures in each of these measurements of an object's length: a. 4  b. 4 c. 4.

The significant figures are the digits or numbers from zero to nine which are used to signify and specify the reporting of the measurement having uncertain digits.

Starting zero is not significant, decimal is not significant, ending zero after the decimal is significant and ending zero before and without decimal is not significant.

Therefore, a. 76.48 cm = 4 b. 76.47 cm c. = 4 76.59 cm = 4 are the number of significant figures in each of these measurements of an object's length.

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Answer:

greater than 115 N upwards

Explanation:

Answer:

collecting relevant data

Explanation:

got this answer from another website ;)

Answer:

Gases, liquids and solids are all made up of atoms, molecules, and/or ions, but the behaviors of these particles differ in the three phases. ... gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.

Hope this helped :)

Answer:

7.12 moles of sand you have in the bucket

Explanation:

Moles are defined as a determined amount of particles. To relate moles with particles it is used Avogadro's number (6.022x10²³ particles / mole).

That means in 1 mole of a determined particle you will have 6.022x10²³ particles.

As in the bucket there are 4.288x10²⁴ particles:

4.288x10²⁴ particles * (1mole / 6.022x10²³ particles) =

Answer:

15.2

Explanation:

the chemical reaction in chemistry libretto texts.

Answer:

Neither

Explanation:

Density is independent of size. Basically, the density of an object isn't determined by it's size.

If two objects are made of the same exact material, they will have the same exact density, regardless of the size.

So, the large brick and the small brick will have the same density, as long as they are made from the same type of brick material.

Answer:

0.72

Explanation:

if 760=1

550=x

=550÷760= 0.72 in two s.f

The atmospheric pressure of the mountain will be 0.723 atm  

Air is everywhere around us at due to which it touches all the surfaces due to which they possess some pressure this exerted pressure is known as atmospheric pressure which can be calculated with this formula.  

1 atm = 760 mmHg

1 mmHg = 0.00131 atmosphere

Substituting the value of 1 atm in the given equation,

1mmHg = 0.00131 atmosphere

550 mmHg = 0.00131

= 550 × 0.00131

= 0.723 A T M  

It is the total force exerted by the atmosphere as AIR has small molecules and every molecule is possessing some weight as when they are in bulk they form layers these layers.

As we go above on the earth the atmospheric pressure will drops due to the increase in the altitude of the earth due to which there will be less amount of oxygen.

Therefore, the pressure will be 0.723 atm.

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Answer:

proteins carry out most of the life sustaining functions of the human body

Answer:

The power of Niagara falls is 1,176 Mega Watts

The number of 15 Watt bulbs it can power is 8,400,000 bulbs

Explanation:

The rate at which the water falls given as the mass flow rate = 2,400,000 kg/s

The height from which the water falls = 50 m

The gravitational potential energy (potential energy PE.) of falling water = Mass (kg) × height (m) × gravity (9.8 m/s²)

The mass of water that falls per second = 2,400,000 kg

PE. = 2,400,000 kg × 50 m × 9.8 m/s² = 1,176,000,000 Joules

The power = The rate at which the energy is generated = The amount in kg of water that fall from the height per second × The height × Acceleration due to gravity

The power = 2,400,000 kg/s × 50 m × 9.8 m/s² = 1,176,000,000 Watts

The power of Niagara falls = 1,176,000,000 Watts = 1,176 Mega Watts

The number of 15 Watt bulbs it can power = 1,176,000,000/15 = 78,400,000 bulbs

The number of 15 Watt bulbs it can power = 8,400,000 bulbs.

Answer:

Precision is good but accuracy is poor

Explanation:

The precision in a measure is about how close is a measured value to each other. In the problem, all measurements are between 15.33 and 15.34cm. Thus, you can say precision is good

And accuracy is about how close are the measured values to the theoretical or real value. The real length of the pencil is 15.85cm. The measurements are not even close of the real value. For that reason, you can sat accuracy of the measurements is poor.

The precision was good while the accuracy was poor. Precision is defined

as how close measurements are with each other.

We were told the data from the measurement was between 15.33cm-

15.34cm which shows how close the measurements are hence having a

good precision.

The accuracy is defined as how close a measurement is to the theoretical

or actual value. In this case, the actual value is 15.85cm which is far from the

values gotten from measurements hence signifying the accuracy was poor.

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Answer:D

Explanation:

Move the decimal back 5 times.

Answer:

First, we can test Solution 1. We know that Sodium Hydroxide is a strong base. If we test acids on blue litmus paper, they will turn red. If we test bases on red litmus paper, they will turn blue.  So, you can test all the of the solutions- water, sodium hydroxide and hydrochloric acid with blue and red litmus paper. HCl, Hydrochloric acid is an acid, so it will turn blue litmus paper red. It will not turn red litmus blue. The acids will turn blue litmus paper red. The bases will turn red litmus paper blue. Only water is a neutral liquid, which will not turn blue litmus paper red or red litmus paper blue. It will not change the colour of it. Thus, if you test all the solutions with blue and red litmus paper, you will know which solution is water.  Water is the only one which is neutral. It is the only solution which cannot change the colour of any litmus paper. Thus, you can identify it very easily.  

Answer:

Al: 3

S: 6

Explanation:

Al is in Group III. This means that it has 3 valence electrons.

S is in Group VI. This means that it has 6 valence electrons.

I hope this helps :)