What does this “e” mean in science atoms molecules etc etc

Answer:

I think it should be Hafnium which is Hf.

Answer:

below sodium but above magnesium

Explanation:

It is necessary to note that only a metal that is above another metal in the activity series can displace it from its compound.

The first statement said that titanium reacts with magnesium oxide. The implication of this is that titanium can displace magnesium from its oxide. This is only possible if titanium is above magnesium in the activity series.

The second statement says that sodium reacts with titanium oxide. This implies that sodium metal can displace titanium from its oxide. For this to occur, then sodium must be above titanium in the activity series of metals. Hence the answer above.

Answer:

it will explod because off all of the prussere but on to it.

Explanation:

Answer:

electromagnetic attraction between polar molecules in which hydrogen is bound to a larger atom, such as oxygen or nitrogen. I hope that was the answer u was looking for

Answer:

A hydrogen bond is the electromagnetic attraction between polar molecules in which hydrogen is bound to a larger atom, such as oxygen or nitrogen.

Explanation:

Answer:The mass numbr is 22

Explanation:

Mass number=number of protons+ number of neutrons....which is 10+12=22

Answer:

1a. Metalloids have properties that are between metals and non-metals, they are alo known as semi-metals.

b.) The yellow border consisting of silicon, boron, Ge As, etc., are metalloid elements

2a.) Non-metals are on the right side of the periodic table.

B.) Non-metals have poor conductivity, are not malleable or ductile, are not sonorous. They are basically the opposite of metals.

Answer: Carbon dioxide concentrations are rising mostly because of the fossil fuels that people are burning for energy.

(1)Extra greenhouse gases in our atmosphere are the main reason that Earth is getting warmer.

(2)Greenhouse gases, such as carbon dioxide (CO2) and methane, trap the Sun's heat in Earth's atmosphere.

(3)It says that the 1997 Kyoto Protocol was an unmitigated success, with every single one of the 36 countries that signed up reducing their mean annual greenhouse gas emissions from 2008-2012 by an average of 5% relative to the levels seen in 1990.Jun 15, 2016 Many argue that Kyoto's failure is due to deficiencies in the structure of the agreement, such as the exemption of developing countries from reductions requirements, or the lack of an effective emissions trading scheme.by 2012

Explanation:

Answer:

C gold

Explanation:

Answer:

People, especially kids, tend to think that when water evaporates it just disappears, or turns into the air. But we know based on the law of conservation of mass that any time water changes state it keeps the same mass!

Similarly, when water vapor turns to water droplets, when it goes from its gas to its liquid state, it still has the same mass. It's just in a different phase. This is a perfect example of conservation in mass!

Answer:

calcium carbonate, is 9.91

Explanation:

Answer:

B or The antacid is basic and will neutralize the acid entering the esophagus.

Explanation:

Answer:

C) It provides a lower activation energy for the reaction is the correct answer.

Explanation:

Answer:

sugar cube is at great pressure

Explanation:

this is because great pressure means its more solid

Answer: A--- West Texas Ecoregions.

Explanation:

The West Texas Eco regions are high plains  characterized  with dry flat land  which receives lowest amount of  rainfall thereby having very short grass vegetation. this flat land has a leveled plateau which ranges from about 3000 to 4500 ft and receives the highest winds due to its nature.

Because It is a dry region, it is prone to heatwaves and drought.

Answer:

Purple. Sodium Hydroxide is an Alkali/base. Bases and Alkalis

have a pH greater than 7, and turn blue-purple in universal

indicator.

Explanation:

Answer: usually D (but it could also be C)

Explanation:

Answer:

A Graduated Cylinder would be you answer because they have markings for smaller measurnments like milliliters

Explanation:

Answer:B

Explanation:

The constellation is not visible in the night sky to this observer in June because: B) Earth revolves around the Sun.

Earth revolution can be defined as the complete motion (movement) of Earth along a path (orbit) around the Sun or the Moon.

Based on Astronomy, it takes the Earth 365 1/4 days to completely move around the Sun.

Due to Earth's revolution around the Sun on a tilted axis, the following observations and events take place:

During summer such as in the month of June, the constellation of Orion is only visible in the sky at day time but not in the night due to Earth's revolution around the Sun.

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Answer: 4, c4h10

Explanation: source:

C4H10 is a saturated hydrocarbon.

A hydrocarbon is an organic compound which consists of carbon (C) and hydrogen (H). For example, C4H10, C2H2 etc. There are four types of hydrocarbons namely alkanes, alkenes, alkynes and aromatic hydrocarbons.

A saturated hydrocarbon is that hydrocarbon in which the carbon atoms are linked only by single bonds. For eg: CH4, C2H6 etc. All alkanes are saturated hydrocarbons.

An unsaturated hydrocarbon is that hydrocarbon in which the carbon atoms are linked through double or triple bonds. For eg: C2H2, C3H4 etc. Alkenes and alkynes are unsaturated hydrocarbons.

C2H2, C3H4 and C4H10 are all unsaturated hydrocarbons. C4H10 is a saturated hydrocarbon as all the carbons are linked through single bonds.

Hence, D is the correct option.

To learn more about hydrocarbons here

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Answer:

the correct answer is c

Explanation:

Explanation:

The first one is series circuit as it is joined one after another while the second one is parallel circuit joined in a parallel way. Ok the line just like this --------- is the wire , the sign like this | | is the battery and the circles with cross are the bulbs

Hope this helps :) Have a great day

Answer:

3.0%

Explanation:

A solution's mass percent concentration, (% m/m), is calculated by observing the mass of solute in grams of obtained in each 100 g of solution. In simple terms, the solution's mass percent concentration is given by the number of parts of solute obtained in every 100 parts of solution, made up of solute and solvent.

Hence the percent m/m concentration of a solution is obtained as;

Mass of solute/ mass of solution × 100/1

From the question, we have,

Mass of solute= 1.4g

Mass of solution= 46.6 g

Therefore, percent m/m concentration of the saline solution=

1.4/46.6 ×100/1 = 3.0%

The percent solute concentration of the solution is 3.0%

Answer: The concentration, in moles per litre, of a solution formed when 13.0 g of calcium hydroxide is dissolved in 5.0 L is 0.036 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

[tex]Molarity=\frac{n}{V_s}[/tex]

where,

n = moles of solute

[tex]V_s[/tex] = volume of solution in L

moles of [tex]Ca(OH)_2[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{13.0g}{74g/mol}=0.18mol[/tex]

Now put all the given values in the formula of molality, we get

[tex]Molarity=\frac{0.18}{5.0L}=0.036M[/tex]

Therefore, the concentration, in moles per litre, of a solution formed when 13.0 g of calcium hydroxide is dissolved in 5.0 L is 0.036 M

Answer:

[tex]\rm_{90}^{231}\text{Th}[/tex]

Explanation:

The unbalanced nuclear equation is

[tex]\rm _{92}^{235}\text{U} \longrightarrow \, _{2}^{4}\text{He} + X[/tex]

Let's write X as a nuclear symbol.

[tex]\rm _{92}^{235}\text{U} \longrightarrow \, _{2}^{4}\text{He} + _{Z}^{A}\text{X}[/tex]

The main point to remember in balancing nuclear equations is that the sums of the superscripts and of the subscripts must be the same on each side of the reaction arrow.

Then

235 = 4 + A , so A = 235 - 4 = 231, and

 92 = 2 + Z , so  Z =   92 - 2 =  90

And your nuclear equation becomes

[tex]\rm _{92}^{235}\text{U} \longrightarrow \, _{2}^{4}\text{He} +\, _{90}^{231}\text{X}[/tex]

Element 90 is thorium, so  

[tex]\rm X = _{90}^{231}\text{Th}[/tex]

Answer:

its d

Explanation:

edg

The heat energy released here can be determines using calorimetric equation. The heat energy released by the steel is 301077 J. Hence, option A is correct.

Calorimetry is an analytical technique used to determine the heat energy absorbed or released by a system. The calorimetric equation  connecting the heat energy with the mass m, specific heat capacity of the substance c and the temperature difference ΔT is given below:

q = m c  ΔT.

given ,

mass of the steel m = 1230 °C

c for steel = 0.486 J/g °C

ΔT = 1230 - 50 °C = 1180 °C.

Then, the heat energy released by the steel into water is determined as follows:

q = 1180 °C × 525 g × 0.486 J/g °C

  =  301077 J.

Therefore, the heat energy released by the steel is 301077 J.

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Answer:

7

Explanation:

An isotope is an atom that has a different number of neutrons than the standard for that atom.

1)Nitogen -14 has 7 protons in the nucleus for its an isotope of nitrogen which has an atomic number of 7.

2)Now we need to find the number of neutrons. This is implied in the name of the isotope whereby the protons and neutrons add up to its atomic number. So

(14-7 protons= 7 neutrons.)

So it has 7 neutrons.

7

I just did it on edgen :)

Answer:

(NH4)2CO3

Explanation:

google

Answer:

A tetrahedral electron domain geometry with covalent bonded atoms.