Explain the need of the term avarage atomic mass

Answer:

true

Explanation:

Answer:

•A Brønsted-Lowry acid is any substance (molecule or ion) that can donate a hydrogen ion ( H+ ).

•A Brønsted-Lowry base is any species that can accept a hydrogen ion ( H+ ).

Explanation:

*example based on the picture*

Take the following reaction for example:

Hydrochloric acid ( HCl ) is the Brønsted-Lowry acid because it donates a hydrogen ion. Ammonia ( NH3 ) is the Brønsted-Lowry base because it accepts the hydrogen ion.

The Brønsted-Lowry theory also introduces the concept of conjugate acid-base pairs. A conjugate acid-base pair are two species that differ by a ( H+ ) ion.

Based on the reaction above, the ammonium ion( NH+4 ) is the conjugate acid of the base ammonia and the chloride ion ( Cl− ) is the conjugate base of hydrochloric acid.

Answer:

Carbon dioxide and heat are generated when coal is burnt in the presence of oxygen. - Coal is mainly made out of carbon contents. - So, the combustion of the coal is actually the combustion of carbon. - During this combustion process, the carbon is chemically bonded with the atmospheric oxygen and forms carbon dioxide.

Explanation:

Charcoal is mostly carbon. When it burns, the carbon combines with oxygen from the air to form carbon dioxide and carbon monoxide gases. So, you have fewer oxygen molecules in the air, and instead carbon monoxide and carbon dioxide molecules.  

         The process of heating coal in the absence of air is called the destructive distillation of coal. Coal contains a number of elements such as carbon, hydrogen, oxygen, nitrogen and sulphur. When coal is heated in the absence of air, a number of products are obtained.

Answer:

Distance walked

Weight

Explanation:

A dependent variable refers to a variable the valuation of which relies on the independent variables. The dependent variable is what has been assessed in a linear expression or tested in an experiment. As the researcher modifies the independent variable, it observes and records the influence on the dependent variable. As per the question, the independent variable is determined by whether someone lives in a city or a suburb and its effect is measured on dependable variables that are distance and weight.

Answer:

C. Solubility

Explanation:

Solubility. A physical property does not change the chemical compostion. Solubility can be observed, unlike the others.

Answer: c. solubility

Explanation: hope this helps

Explanation:

Ba(OH)2 ==>  Ba2+  +  2OH-

1.7 g = 0.008172796 moles Ba(OH)_2

1:1 for Ba2+ = 0.008172796 moles / .15L = 0.054M

2:1 for OH- = 0.016345593 moles / .15L = 0.109M

Kw = [H+] x [OH-] = 10^{-14}

10^{-14} / 0.109 = 9.2×10^{-14}  = [H+]

Answer:

the dependent variable is the number of bug bites with the spray

Explanation:

The  dependent variable is number of bug bites.

An experiment must involve two variables;

The independent variable is the variable that we have to change consistently. The effect of changing this variable on another variable called the independent variable is monitored.

In this case, the independent variable is the spraying of the arm while the dependent variable is the number of bug bites.

The number of bug bites is the dependent variable because it changes as a result of spraying or not spraying the the arm.

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Answer:

It is produced in nuclear reactors.

Explanation:

Fermium is a synthetic element and is not found naturally.

Answer:

Conversion gives 42,107 km in total

Explanation:

A marathon covers 26 miles and 285 yards.

If 1 kilometer is 0.6214 miles, then how many kilometers are 26 miles, then:

1 km = 0.6214 miles

X = 26 miles

X = 41,841 km

Now if 1 yard is 36 inches, how many inches is 285 yards?

1 yard = 36 inches

285 yards = X

X = 10260 inches

If an inch is equal to 2.54 cm, how many centimeters are 10260 inches?

1 inch = 2.54 cm

10260 cm = X

X = 26060.4 cm

And 26060.4 cm is 0.260604 km

Finally, the sum of the distance would be:

41.841 km + 0.260604 km = 42.107 km

Answer:

kindly check the explanation section.

Explanation:

The largest rice cake in the world was discovered in the year 2007 in South Korea with a weight of 8,113 lb. The amount of energy in the World's largest rice cake can be determined by using the formula below:

The energy in kJ =[ mass of water] x [specific heat capacity of water] x [change in temperature].

In order to determine experimentally in the laboratory and make use of the formula above. The first thing[STEP ONE] to do is to measure the mass of the rice cake and record it.

STEP TWO: measure a known amount of water in a boiling tube.  

STEP THREE: Heat the rice cake until it catches fire with a Bunsen flame.

STEP FOUR: Use the rice cake that has already caught fire in step three above and use it to heat the water in step two until the fire burns out.

Repeat the process for three to four times and record your observations under the following headings;

[1]. Mass of cake, [2]. Temperature  of water  before  burning, [3]. Temperature  of water after  burning and Temperature  increase per  gram of the rice cake.

NaCl, H2O and O2 are all pure substance since it cant be separated.

black hole

hope it helps

edit: neutron star

Answer:

Neutron Star

Explanation:

Explanation:

They come in different kinds, called elements, but each atom shares certain characteristics in common. All atoms have a dense central core called the atomic nucleus. ... All atoms have at least one proton in their core, and the number of protons determines which kind of element an atom is.

The common feature is that the atoms of all elements consist of electrons, protons, and neutrons.

An atom is a particle of matter that uniquely defines a chemical element.

An atom consists of a central nucleus that is usually surrounded by one or more electrons.

All atoms of an element have the same number of protons, and every element has a different number of protons in its atoms.

For example, all helium atoms have two protons, and no other elements have atoms with two protons.

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Answer:

This question appears incomplete

Explanation:

However, it should be noted that addition of soluble salts generally lowers the freezing point of water hence after the addition, water will no longer freeze at 0°C but lower.

Soluble salts tend to form more ions in water, it is these ions that are responsible for interfering with the hydrogen bonds hence lowering the freezing. Thus, (since each bag are of the same weight) the bag that contains the salt that ionizes more in water will lower the freezing point by the greatest amount.

NOTE: Different weight of the salts could lead to more ions been formed in the water by some salts as against the other.

Density= mass/volume

D=25/25

D= 1  g/cm^3

Answer:

Temperature: The rate of evaporation increases with an increase in temperature. Surface area: The rate of evaporation increases with an increase in surface area. Humidity: The amount of water vapour present in the air is called humidity.

may this help you.

hello,

here is your answer:

**********

Factors affecting evaporation:

⇒ Increase in surface area - if the surface area is increased the rate of evaporation increases.

⇒ Increase in temperature - with increase in temperature, more particles get enough kinetic energy to turn into vapour.

⇒ Decrease in Humidity - air around us can't hold more than a definite amount of water vapour, if amount of water vapour is already high, then rate of evaporation decreases.

⇒ Increase in wind speed - with increase in wind speed, the particles of water vapour move away with the wind, decreasing the amount of vapour in the surrounding atmosphere.

**********

hope this helped,

:)

Answer:

Explanation:

From the question

mass of Nitrogen = 56 g

Molecular weight = 28 g/mol

To find the number of miles we use the formula

[tex]n = \frac{m}{M} [/tex]

where

n is the number of miles

m is the mass

M is the molecular weight

So we have

[tex]n = \frac{56}{28} [/tex]

We have the answer as

To find the volume we use the formula

V = n × V(dm³)

where

V is the volume

n is the number of miles

V(dm³) is the volume of 1 mole of a gas at STP which is 22.4 dm³

So the volume is

V = 2 × 22.4

We have the answer as

Hope this helps you.

Answer:

3.2 x 10^3

Explanation:

I answered this question on my assignment just not and got it right.

3.2 mg is equivalent to 3.2 × 10³ μg.

In order to convert 3.2 mg to μg, we need to consider 2 conversion factors:

3.2 milligrams, expressed in micrograms, is:

[tex]3.2 mg \times \frac{1g}{10^{3}mg } \times \frac{10^{6}\micro g }{1g} = 3.2 \times 10^{3} \micro g[/tex]

3.2 mg is equivalent to 3.2 × 10³ μg.

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Answer:

10

Explanation:

The prefixes attached to metric units carry the same meaning for all base units. The metric system is based upon powers of ten, which is convenient because: A measurement in the metric system that is represented by a rational number remains a rational number after metric unit conversion.

Answer:

Finding volume:

V(wood)=l×b×h=3×4×5=60cm³

we have been given the mass of the wood as 180 grams and we know that"

Density = mass/ volume

substituting in the mass and volume

=> D=180/60=3g/cm³

Answer:

Chemistry is the study of matter and the chemical reactions between substances. Chemistry is also the study of matter's composition, structure, and properties. ... Chemistry is sometimes called “the central science,” because it bridges physics with other natural sciences, such as geology and biology.

Explanation:

I hope this helps you!!

Answer:

For example, propene reacts with aqueous chlorine to form 1-chloro-2-propanol as the major product.

Answer:

The change from deep to shallow water waves occurs when the depth of the water , d , becomes less than one half of the wavelength of the wave, λ....A wave with a longer wavelength travels at higher speed . In contrast , shallow - water waves show no dispersion . Their speed is independent of their wavelength .

Hope this helps :)

In an ocean ecosystem,the difference between deep water and shallow water waves is that  waves in water deep enough so that the bottom has no effect on them are termed deep-water waves, whereas waves most affected by the bottom are called shallow-water waves.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Answer:

The density of each piece is the same as that of the original block.

Explanation:

Options

The mass of each piece is the same as that of the original block.

The weight of each piece is the same as that of the original block.

The density of each piece is the same as that of the original block.

The volume of each piece is the same as that of the original block.

The correct answer would be that the density of each piece is the same as that of the original block.

The density is the ratio of the mass of a substance to the volume of the substance. This ratio is constant for all substances because the mass of any object varies proportionally with the volume of the object. The more the mass increases, the more the volume also increases, and vice-versa.

Answer:

The answer is, C. funnel

Explanation:

Answer:

solvent

Explanation:

Answer:

Ethyl ethanoate is formed

Answer:

Formation of intermolecular hydrogen bonding between water molecules and molecules of n-butanol

Explanation:

Low molecular weight alcohols are miscible with water in all proportions. The reason for this is that, when a low molecular weight alcohol is dissolved in water, intermolecular hydrogen bonds are formed between the low molecular weight alcohol and water molecules.

Low molecular weight alcohols such as n-butanol contain the polar -OH group which interacts with water via hydrogen bonding.

Answer:

n-Butanol molecules surround water molecules.

Explanation: its correct on ed gen uity

Answer:

How do Newton's laws of motion explain why it is important to keep the ice smooth on a hockey rink so that players can pass a puck as quickly as possible? Smooth ice reduces the unbalanced forces that would slow the hockey puck. A skydiver falls toward the ground at a constant velocity.

Explanation:

Answer:

are you a kid bruh xd

Explanation:

H2O

Answer:

[tex]\huge\boxed{H_{2}O}[/tex]

Explanation:

Water is made up of two elements => Hydrogen and Oxygen

There are two hydrogen and one oxygen

So,

The chemical formula for water is:

=> H₂O