Who made the first periodic table of the element

Answer:

high temperature

Explanation:

Answer:

10 L of CO₂.

Explanation:

The balanced equation for the reaction is given below:

2CO + O₂ —> 2CO₂

From the balanced equation above,

2 L of CO reacted to produce 2 L of CO₂.

Finally, we shall determine the volume of CO₂ produced by the reaction of 10 L CO. This can be obtained as follow:

From the balanced equation above,

2 L of CO reacted to produce 2 L of CO₂.

Therefore, 10 L of CO will also react to produce 10 L of CO₂.

Thus, 10 L of CO₂ were obtained from the reaction.

10L of carbon dioxide will be produced from 10L of carbon monoxide.

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Answer:

Explanation:

They're all forms of science!  

Answer:

photosynthesis

Explanation:

Answer:

Photosynthesis

Explanation:

I had it on a quiz.

Answer:

Yes, a chemical reaction has occurred

Explanation:

A chemical change is known to lead to the appearance of a new substance. Another name for chemical change is chemical reaction.

The new substance is formed when the bonds in the reactants are being rearranged to yield the products of the reaction.

In this case, two clear liquids were mixed and the contents of the system interacted briefly to yield a new product which appears as the white powder suspended in a clear,  colorless liquid.

Answer:

No, it is not a mineral

Explanation:

Emerald is an important gemstone. It is famous for its green colour. Emerald is one of the most valuable gemstones. It is very much useful in the production of jewelry.

Emerald can be created in the laboratory. Such laboratory created emerald are still regarded as real emerald but they are not minerals. Only naturally occurring emeralds are minerals.

Answer:

Beryllium.

Silicon.

Explanation:

Beryllium has 2 electrons in their outermost shell and has highly reactive than boron because Boron needs 3 electrons to lose whereas, beryllium needs to lose only 2 electrons to get stability. Silicon has 4 electrons in its outermost shell and is less reactive than aluminum because aluminum has to lose 3 electrons to get stability as compared to silicon which needs 4 electrons to lose to be stable and non-reactive.

Answer:

All the gases have the same number of molecules.

Answer:

Field of repulsion.

Explanation:

An experiment can be defined as an investigation which typically involves the process of manipulating an independent variable (the cause) in order to be able to determine or measure the dependent variable (the effect).

This ultimately implies that, an experiment can be used by scientists to show or demonstrate how a condition causes or gives rise to another i.e cause and effect, influence, behavior, etc in a sample.

Cause and effect can be defined as the relationship between two things or events in which an occurrence one (cause) leads to the occurrence of another (effect).

In this scenario, a teacher sprinkles some iron shavings on a clear tray. She places two magnets in the shavings with the north ends facing each other. Based on the cause-and-effect relationship between the magnets, the phenomenon the teacher is modeling for her students is field of repulsion.

Generally, the two north ends of a magnet have the same polarities and as such are considered to be like charges.

Hence, the field of repulsion is a phenomenon that is based on the fact that like charges repel while unlike charges attract. Thus, the north end of a magnet would repel the north end of another magnet placed beside it.

Answer:

Mass ratio:

a. Approximately [tex]51.2\%[/tex].

b. Approximately [tex]35.3\%[/tex].

c. Approximately [tex]43.2\%[/tex].

Explanation:

Look up the relative atomic mass of each element on a modern periodic table:

For example, the relative atomic mass of [tex]\rm Al[/tex] is [tex]26.982[/tex]. Hence, the mass of one mole of [tex]\rm Al\![/tex] atoms would be (approximately) [tex]26.982\; \rm g[/tex].

Calculate the formula mass of [tex]\rm H_2O[/tex]:

[tex]\begin{aligned} & M({\rm H_2O}) \\ &= 2 \times 1.008 + 15.999 \\ &= 18.015\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

Calculate the formula mass for each of the hydrates:

[tex]\begin{aligned}& M({\rm MgSO_4 \cdot {7\, H_2O}}) \\ &= 24.305 + 32.06 + 4 \times 15.999 \\ & \quad\quad + 7 \times (2 \times 1.008 + 15.999) \\ &= 246.466\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

[tex]\begin{aligned}& M({\rm LiC_2H_3O_2 \cdot {2\, H_2O}}) \\ &= 6.94 + 2 \times 12.011 + 3 \times 1.008 + 2 \times 15.999 \\ & \quad\quad + 2 \times (2 \times 1.008 + 15.999) \\ &= 102.014\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

[tex]\begin{aligned}& M({\rm Al(NO_3)_3 \cdot {9\, H_2O}}) \\ &= 26.982 + 3 \times (14.007 + 3 \time 15.999) \\ &\quad \quad + 9 \times (2 \times 1.008 + 15.999) \\ &= 375.129\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

The mass of [tex]1\; \rm mol[/tex] of [tex]{\rm MgSO_4 \cdot {7\, H_2O}}[/tex] formula units is [tex]246.466\; \rm g[/tex].

There are seven mole of [tex]\rm H_2O[/tex] formula units in that many [tex]{\rm MgSO_4 \cdot {7\, H_2O}}[/tex] formula units. The mass of that [tex]7\; \rm mol[/tex] of [tex]\rm H_2O\![/tex] formula units would be [tex]7 \; \rm mol \times 18.015\; \rm g \cdot mol^{-1} = 127.105\; \rm g[/tex].

Hence, the percentage mass of [tex]\rm H_2O[/tex] in [tex]{\rm MgSO_4 \cdot {7\, H_2O}}[/tex] would be:

[tex]\begin{aligned}\frac{127.015\; \rm g}{246.466\; \rm g} \approx 51.2\%\end{aligned}[/tex].

Similarly:

Answer:

v = 15/2

Decimal Form:

v = 7.5

Mixed Number Form:

v = 7  1/2

Explanation:

Hope this helps!

Answer: Your answer is J

Explanation: This can occur when moon is closest to earth.

So the moon in between earth and sun.

Also factually the moon can effect human behavior, because humans are made up of some percent of water.

Answer:

84% yield

42/50 = 0.84 = 84%

Answer:

B. Volcanoes

Explanation:

B. Volcanoes

Answer:

B:Volcanoes

Explanation:

because valley rift develops

Answer:

Covalent bonding is a type of chemical bonding which is characterized by atoms sharing electrons. For nitrogen and chlorine to covalently bond, nitrogen needs 3 electrons. Chlorine only has one electron therefore two more chlorine molecules are needed. Because one atom of nitrogen needs 3 atoms of chlorine to bond, the formula will be NCl3.

Neutralization reaction

Hello, in the following reaction HBr is strong acid when reacts with Amphoteric Aluminium hydroxide gives water & AlBr3 as salt.

We know that in neutralization reaction

acid & bases reacts to give salt and water. Hence following reaction is neutralization reaction.

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Answer:

A oxygen

Explanation:

For plant growth nitrogen, potassium and phosphorous are the three main elements needed. oxygen is expelled from plants. Plants doesn't need oxygen

In an ecosystem it is a bad idea to plant 100 seeds in your plant experiment as there would be competition for resources among the seeds.

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:

Liquids and gases flow easily because their particles can move or slide past one another.

Explanation:

Hope this helped Mark BRAINLEST!!

Answer:

No.

Materials like water get evaporated when heated, but materials like camphor get sublimed that is they directly get converted into gaseous form when heated, while materials like copper gets melted on heating

Answer:

Maybe you could do something with nuclear power plants and how we use those to create electrical energy for our phones, houses etc?

Answer: around 137.33

Explanation:

Answer: 1.5 moles/L

Explanation:

Molarity = moles/ Liters

to find the molarity of BaO: 3moles/2L = 1.5 moles/L

Answer:

amplitude or pitch

Explanation:

Answer:

1.03 mol of dihydrogen gas will evolve, with a volume slightly over

22.4 [tex]dm^{3}[/tex] at STP.

Explanation:

How does the water help a fossil form?

The answer is 1

Answer:

Albedo affects the climate by controlling the amount of radiation a particular planet absorbs, weather can also depend on how much the earth absorbs radiation in case of the earth.

.

Answer:

Explanation:

ndicator species (IS) are animals, plants, or microorganism used to monitor changes in our environment. For example, they can tell us about the impact of pollution on an ecosystem, or how well an impaired environment is being managed or restored.

Answer:

See explanation

Explanation:

On the pH scale acidity ranges from pH values of 0-6.9. Natural rain water is slightly acidic due to the presence of carbon dioxide in the atmosphere which is an anhydride of carbonic acid.

CO2(g) + H2O(l) -------> H2CO3(aq)

B. The equations that turn sulfur to sulfuric acid are;

S(l) + O2(g) -----> SO2(g)

2SO2(l) + O2(g) -----> 2SO3(g)

SO3(g) + H2SO4(l) -----> H2S2O7(l)

H2S2O7(l) + H2O(l) ----> 2H2SO4(l)

-

At pH 6, H^+ concentration = 1 * 10^-6 M

At pH 2, H^+ concentration = 1 * 10^-2 M

Hence;

1 * 10^-2/1 * 10^-6

= 10^4 times more acidic

Answer:

I believe it is a chemical change

Explanation:

because it is changing into something new