help please place the ph test papers I️n order from most acidic to most alkaline

Answer:

(NH4)2CO3

Explanation:

google

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:

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: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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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:

[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

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:

Explanation:

This can be determined in as represented in the three (3) steps below.

1. Movement of heavy and light particles

Note that both the particles are trying to occupy the maximum room, by having constant elastic collision with the boundary and each other, thereby following brownian motion

Also note that heavy particles travel slowly and lighter ones travel faster

Increasing temperature will increase the speed of the particles in the chamber and will also increase the pressure inside the chamber

Hence, ideal gas mixtures occur following ideal gas laws, like a mixture of CO₂ ( heavy gas) with H₂ ( lighter gas)

2. Measuring the length of the chamber by ruler, we have l = 6.6 mm

time taken by heavy molecule at 570 k, t = 11.63×10⁻¹² s [ using stop watch]

so, speed of molecule = 567.49 m/s

3. Therefore, at 2.8 atm pressure, 277 K temperature, 989 heavy particles of gas are there

This is gotten as the relative size of the molecules

Answer:

The National Weather Service

Tornadoes

Explanation:

The National Weather Service

Tornadoes

happen in San Angelo.

Hope this helps

Answer:

174.9591 Grams mate :) have a good day ily

Explanation:

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:

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:

an article on the beneficial bacteria in yogurt, featured in Medical Journal of Gastroenterology

Explanation:

This article is published in a Medical Journal, which means the contents must be credible, informative, and accurate. In order to be these things, the author most likely had others review their writing to remain objective and ensure quality work. The other articles are not meant to solely inform and are featured in less credible magazines. Therefore, the third option is correct.

Answer:

an article on the beneficial bacteria in yogurt, featured in Medical Journal of Gastroenterology

Explanation:

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: 5.3 moles

Explanation:

Hi, to answer this question we have to apply the next formula:

n = PV/RT

Where:

n = number of moles

P= Pressure = 2.15 atm

V= volume = 60.5 L

R = 0.0821 atm(L)/mol(K)

T = temperature = 25 °+ 273.15 = 298.15 Kelvin  

Replacing with the values given:

n = 2.15 (60.5) / 0.0821 (298.15) = 5.3 moles.

Feel free to ask for more if needed or if you did not understand something.

Answer:

A tetrahedral electron domain geometry with covalent bonded atoms.

Answer:

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

Explanation:

Answer: 79.9182 g/mol

Answer: Balance (B.)

Explanation:

Balances are used to measure mass.

Beakers and graduated cylinders measure volume. Stopwatches measure time. Meter sticks measure length. Thermometers measure temperature.

Answer:

2.1 mol

Explanation:

68.1g / 34.1 g/mol = 2.1mol

Answer:

The answer is A.

Explanation:

A P E X

Gamma radiation arises from the radioactive decay of the nuclei along with the release of γ. The reaction of the Technetium (Tc) element represents the gamma decay. Thus, option A is correct.

Gamma packets are the energy packets released in the radioactive decay reaction where the particle undergoing decay does not have a change in the number of protons or neutrons but instead moves the nucleus from higher to lower energy levels. The gamma emission is depicted by,

⁹⁰Tc₄₃   →  ⁹⁰Tc₄₃ + γ

In the gamma decay of the Technetium element, the nucleus from the higher energy lowers and produces the same elements along with a gamma photon.

In gamma decay, the unstable nuclei dissipate energy in the form of gamma rays or photons. In this type of radioactive decay, the element in the reactant and the product are the same.

Therefore, a reaction involving Tc is an example of gamma emission.

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Answer:

Oobleck has been used to manufacture shoes, filling of portholes, making bullet proof vest.

Explanation:

Oobleck is a non Newtonian fluid which is made from mixture of cornstarch and water. It has both liquid and solid properties. Its act like a liquid when is poured and as a solid when a force act on it. It is a substance that is use in manufacturing shoes. The inside layer of shoes is made of it. It's viscosity increases when there is shear stress. It is use for filling portholes

Answer:

The research could enhance protection of police and soldiers and create softer robots. This cornstarch and water mixture, known as “oobleck,” is a shear thickening liquid that can rapidly switch between a liquid-like and a solid-like state in response to externally applied stress.

Explanation:

Answer:C is most likely a metalloid

Explanation:A is a metal while B is a non metal. This is because when we look at the properties of metals, they are very lustrous and have a high conductivity. On the other hand, non metals are the opposite but metalloids have properties the are inbetween ie, they react with either an acid or base, and have a medium electrical conductivity unlike metals(high) anc non metals(low).

Answer:

Malik analyzed three samples to test which element was a metalloid. The table shows his results.

A 7-column table with 3 rows. The first column titled element has entries A, B, C. The second column titled lustrous has entries yes, no, yes. The third column titled brittle has entries no, yes, yes. The fourth column titled how it reacts has entries base, acid, acid or base. The fifth column titled boiling point (degrees C) has entries not observed, negative 34.04, not observed. The sixth column titled melting point (degrees C) has entries 97.72, not observed, 1413.85. The seventh column titled electrical conductivity has entries high, very low, medium.

Which element (A, B, or C) is most likely a metalloid?  

✔C

Explanation:

Edge 2021

Answer:

I think it should be Hafnium which is Hf.

Answer:

phase for what?

Explanation:

Answer:

It is a mixture

Explanation:

An element comprises of a single type which exists on its own.

A compound comprises of two or more which are bonded together chemically

A mixture comprises of different substances which are combined physically.

Answer:

Explanation:

Endothermic reactions absorb energy from the surrounding, but exothermic reactions release energy to the surrounding.