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Answer:

1.  7.86 × 10⁴ g

2.  7.86 × 10⁴ kg

3.  1.989 × 10¹³ mg

4.  1.989 × 10²⁸ kg

5.  1.989 × 10³³ g

Explanation:

The easiest way to make sure you have the right answer is to convert all units to the same unit.

A.  1.989 × 10¹³ mg = 1.989 × 10¹⁰ g

B.  7.86 × 10⁴ g

C.  1.989 × 10³³ g

D.  7.86 × 10⁴ kg = 7.86 × 10⁷ g

E.  1.989 × 10²⁸ kg = 1.989 × 10³¹

The correct order is B < D < A < E < C

Answer:

E conduct electricity when melted

Explanation:

They can not produce electricity until dissolved/ melted in water

Answer:

his reaction is the synthesis of Ammonia using Nitrogen and Hydrogen gas.

N

+

H

→

N

H

3

We must remember that Nitrogen and Hydrogen are both diatomic molecules in their standard gas form. This adjusts the equation to

N

2

+

H

2

→

N

H

3

Now we need to adjust coefficients in order to balance the atoms on each side of the equation. Currently we have 2 atoms of nitrogen and 2 atoms of hydrogen on the reactant side and 1 atom of nitrogen and 3 atoms of hydrogen on the product side.

We can balance the hydrogens by placing a coefficient of 2 in front of ammonia and a coefficient of 3 in front of the hydrogen.

N

2

+

3

H

2

→

2

N

H

3

This gives us 6 hydrogen on each side and coincidentally the nitrogens now equal 2 on each side.

I hope this was helpful.

Explanation:

Answer:

1N2 + 3H2 →2NH3

Explanation:

Plato answer

Answer:

Explanation:

Synthesis- D

Combustion- C

Decomposition- A

Single Displacement- C

Double Displacement- B

Answer:

chemical equation balance.

Explanation:

if you need more explanation , comment.

Answer:

What's the problem???

Answer:

Explanation:

d

Answer:

D. All it’s mechanical energy is transformed into other forms of energy.

Explanation:

I got it right

Answer:

Option B. 126.68 amu

Explanation:

The following data were obtained from the question:

Isotope A (¹²⁷X):

Mass of A = 127

Abundance (A%) = 80%

Isotope B (¹²⁶X):

Mass of B = 126

Abundance (B%) = 17%

Isotope C (¹²⁸X):

Mass of C = 128

Abundance (C%) = 3%

Average atomic mass of element X =.?

Th4 average atomic mass of X can be obtained as follow:

Average atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]

= [(127 × 80)/100] + [(126 × 17)/100] + [(128 × 3)/100]

= 101.6 + 21.42 + 3.84

= 126.68 amu

Therefore, the average atomic mass of X is 126.68 amu

Answer:

Principle stating that specific groups of organisms have followed, or succeeded one another in a definite sequence through Earth history

Explanation:

Principle stating that specific groups of organisms have followed, or succeeded one another in a definite sequence through Earth history describe Faunal succession because it is a principle that indicate that fossil plants and animals succeed each other in a sequential manner even if they occur in different places. Successive strata and faunas are linked together to form composite section in the Earth's history.

Answer:

the last one

Explanation:

Answer:

some zoom in farther

Explanation:

some microscopes zoom in farther than others so we can see even smaller things

since 73% of the isotope is given, take 100%-73% to get the remaining % of the isotopes which is going to be 27%.

hence,

atomic weight= (73×59) + (27×62)

=4307+1302

=5609 amu

Growth hormon somatotropin

Answer:

The answer is the second picture.

Explanation:

When you perceive a sound lower than its actual pitch, then you must have been further from the actual position.

The pitch of a sound is a perceptual property of sounds that allows sound of similar frequencies to be distinguished.

Pitch is the quality of sound, that makes it possible to judge sounds as "higher" and "lower" in the sense associated with musical notes.

Thus, when you perceive a sound lower than its actual pitch, then you must have been further from the actual position.

Learn more about pitch of sound here: https://brainly.com/question/61859

#SPJ2

Answer:

B. They have the same number of protons and electrons

Explanation:

Protons have a charge of +1, electrons have a charge of -1, and neutrons have no charge, making them neutral. When there are the same number of protons as there are electrons, the charges balance out, leaving you with a neutral atom.

The illustration is an example of surface waves.

Answer:

Explanation:

Beta radiations:

mass 1/200 , charge -1, medium penetration

Beta radiations are result from the beta decay in which electron is ejected.

The mass of beta particle is smaller than the alpha particles.

They can travel in air in few meter distance.

These radiations can penetrate into the human skin.

The sheet of aluminum is used to block the beta radiation

Properties of alpha radiation:

mass 4 amu, charge +2, least penetration

Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4  and atomic number less than 2 as compared to parent atom the starting atom.

Alpha radiations can travel in a short distance.

These radiations can not penetrate into the skin or clothes.

These radiations can be harmful for the human if these are inhaled.

These radiations can be stopped by a piece of paper.

Gamma radiations:

mass 0, charge 0, deepest penetration

Gamma radiations are high energy radiations having no mass.

These radiations are travel at the speed of light.

Gamma radiations can penetrate into the many materials.

These radiations are also used to treat the cancer.

Lead is used for the protection  against gamma radiations because of its high molecular density.

The lead apron are used by the person when treated with gamma radiations.

Answer:

Mass is measured in kg

Acceleration is measured in m/s^2

Weight is measured in Newtons

Momentum is measured in kg/m^2

Answer: Summary of Common Properties

Explanation:

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Answer:

The two properties of most non metals are high ionization energy and poor electrical conductivity. The correct option among all the options that are given in the question is option "1". In general it is known that nonmetals are very poor conductors of heat and electricity. The nonmetals that are solid are normally very brittle and has very little or no metallic luster at all. Nonmetals are highly reactive and show variety of chemical properties. It can also be pointed out that the nonmetals gain electrons very easily.

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Answer:

Reactivity

Explanation:

Luster. Ductile, and Malleabillity are all physical.

Answer:

box A

Explanation:

10 is bigger than 3 since 10 is bigger it has more force in it

Answer:

The purpose of using a chemical equation is to keep track of elements and the number of atoms of each of the elements on each side of the equation. ... They use symbols and formulas to show the chemical reaction so that chemical names do not need to be written out.

Answer:

:0

Explanation:

Sample Response: Chemical equations show how chemicals interact when a reaction occurs. They use symbols and formulas to show the chemical reaction so that chemical names do not need to be written out. They also help keep track of all elements and the number of atoms of each element on each side of the equation.

Answer:

The boiling point increases with increased pressure up to the critical point, where the gas and liquid properties become identical.

Answer:

Science is the pursuit and application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence. Scientific methodology includes the following: Objective observation: Measurement and data (possibly although not necessarily using mathematics as a tool)

Explanation:

Answer:

Modern science is typically divided into three major branches that consist of the natural sciences (e.g., biology, chemistry, and physics), which study nature in the broadest sense; the social sciences (e.g., economics, psychology, and sociology), which study individuals and societies; and the formal sciences

Answer:

Explanation:

CaCO₃     +     2HCl     →      CaCl₂    +    CO₂       +       H₂O

100 gm  +  2000 mL of M HCl

Amount of HCl remaining = .1018 M of 16.62 mL

= .1018 x 16.62 mL of M HCl

= 1.69 mL of M HCl

Initial HCl taken = 50 mL of .1035 M HCl

= 5.175 mL of M HCl

HCl reacted = 5.175 - 1.69 mL of M HCl

= 3.485 mL of  M HCl

2000 mL of M HCl reacts with 100 gm of CaCO₃

3.485 mL of M HCl will react with .174 grams of CaCO₃

percentage of calcium carbonate = .174 x 100 / .2027

= 85.84 %

America's age = 243.85 years

When converting units, list and multiply all the units until you find the unit you want

Time unit conversion

1 year = 365 days

1 day = 24 hours

1 hour = 3600 s

7.69 x 10⁹ seconds to years :

[tex]\tt =7.69\times 10^9~s\times \dfrac{1`hour}{3600~s}\times \dfrac{1~day}{24~hours}\times \dfrac{1~years}{365~days}\\\\=\dfrac{7.69\times 10^9}{3600\times 24\times 365}\\\\=\boxed{\bold{243.85~years}}[/tex]