PLEASE HELP!!!!!!!!!!!!!!!!!!!

Answer:

The answer is Double - Replacement Reactions

Explanation:

Double - Replacement Reactions are two different things that change places with each other.

Answer:

B)  kilometer.

Explanation:

Took the test

Oxygen gas is most likely to act as an ideal gas at STP. Therefore, option B is correct.

An ideal gas is a hypothetical gas composed of randomly moving point particles without interparticle interactions. The ideal gas is useful because it follows the ideal gas law.

Under various conditions of temperature or pressure, many real gases behave like an ideal gas where the gas molecules as the ideal particles. Many gases such as nitrogen gas, oxygen gas, hydrogen gas, noble gases, some heavier gases such as carbon dioxide, and mixtures such as air, can be treated as ideal gases.

A gas behaves more likely as an ideal gas at higher temperature and lower pressure, as the potential energy because intermolecular forces become less and the size becomes less significant compared to the vacant space between them.

One mole of an ideal gas has a volume of 22.7 liters at standard temperature and pressure. At high pressures, the volume of a real gas is generally larger than that of an ideal gas.

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Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume}\\[/tex]

From the question

mass = 78.51 g

volume = final volume of water - initial volume of water

volume = 45 - 20 = 25 mL

So we have

[tex]density = \frac{78.51}{25} \\ = 3.1404[/tex]

We have the final answer as

Hope this helps you

Absorbing light and through collisions

If 45.0 grams of magnesium hydroxide is heated, the amount of water that will be produced would be 13.90 grams

From the equation of the reaction:

Mg(OH)₂  →  MgO + H₂O

The mole ratio of Mg(OH)₂ to H₂O is 1:1

Mole of 45 grams Mg(OH)₂ = 45/58.33 = 0.77 moles

Thus, the equivalent mole of H₂O produced would also be 0.77 moles.

Mass of 0.77 moles H₂O = 0.77 x 18.02 = 13.90 grams

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Answer:

If a spacecraft was parked on Venus and needed to make a flight to Jupiter, it would need to travel 670,338,270 km.

Explanation:

Jupiter - Various Properties

Jupiter Meaning:

Jupiter is the largest planet in the solar system. Fittingly, it was named after the king of the gods in Roman mythology. In a similar manner, the ancient Greeks named the planet after Zeus, the king of the Greek pantheon.

Venus - Various Properties

Venus Meaning:

Venus (plural veneres) is the Latin word for ‘loveliness,’ ‘beauty,’ ‘charm,’ It is derived from Proto-Italic *wenos- ('desire'). The ultimate source is the Proto-Indo-European (PIE) *wenh₁-os ('desire').

To calculate how far the spacecraft would need to fly is to calculate the distance betwen Venus and Jupiter.

To save energy, let's consider a Hohmann transfer orbit, an ellipse tangent to opposite sides of Venus's and Jupiter's orbits. The spacecraft would follow the outbound half of this orbit, departing ahead of Venus and arriving as Jupiter overtakes it.

Depending on where in Jupiter's orbit the spacecraft meets it, this orbit has semi-major axis a = (rV + rJ) / 2 = 2.96±0.03 au and period of a3/2 = 5.10±0.08 years. The outbound half has a path length of 7.78±0.07 au and takes 2.55±0.04 years. As Jupiter moves 72° to 84° around the Sun in that time, the launch window is when Venus's heliocentric ecliptic longitude is 96° to 108° behind Jupiter's.

To convert au to km, multiply by 1.496 × 108 km / au.

If a spacecraft was parked on Venus and needed to make a flight to Jupiter, it would need to travel 670,338,270 km.

Answer:

If a spacecraft was parked on Venus and needed to make a flight to Jupiter, it would need to travel 670,338,270 km.

Explanation:

Answer:

What could happen if the nervous system and the endocrine system stopped communicating is that body regulation functions would be lost, constituting the loss of organic balance or homeostasis.

Explanation:

There is a close relationship between the nervous and endocrine systems, or what is also known as the neuroendocrine system.

The nervous system is in charge of the regulation of all the vital functions, receiving external information, processing it and elaborating an adequate response. When it comes to the internal functions of the organism, the endocrine system receives orders from the nervous system to regulate them and maintain homeostasis.

If the communication between Nervous system and the endocrine system did not exist, there would be no way to regulate many functions and the organism would lose its ability to maintain internal balance.

An example of this would be the function of vasopressin or antidiuretic hormone (ADH). This hormone is produced by the hypothalamus and released by the neurohypophysis, being its main function the regulation of the hydroelectrolytic balance. If the communication between both systems did not exist, the function of ADH would not be possible, and the hydroelectrolytic balance would be lost.

If there is no communication between Nervous system and the endocrine system, there would be no way to regulate many functions and the organism would lose its ability to maintain internal balance.

⇒For example:

The activity and role of the adrenal glands in response to stress provide an excellent example of interdependency of the nervous and endocrine systems and if there is no communication between the two systems thus there will be no activity of adrenal glands.

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Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\[/tex]

From the question

mass = 31 g

density = 444 g/mL

We have

[tex]volume = \frac{31}{444} \\ = 0.06981...[/tex]

We have the final answer as

Hope this helps you

The limiting reactant would be Cu and the excess reactant would be S.

From the equation:

     2Cu + S → Cu2S

Mole ratio of Cu to S = 2:1

Mole of 40.2 g Cu = 40.2/63.55

                                 = 0.63 moles

Mole of 14.1 g of S = 14.1/32.07

                                     = 0.44 moles

Equivalent mole of Cu = 0.44 x 2 = 0.88 moles

Thus, Cu is limiting while S is in excess.

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Answer:

The first two are 0.633 and 0.440

The answer for the next sentence is Copper and Sulfur

Answer:

B.

Explanation: Because it's at the bottom of the layer so it gets least sun and solar energy.

Answer:

Tidal power surrounds gravitational hydropower, which uses the movement of water to push a turbine to generate electricity.

Explanation:

:)

Answer:

hydropower that works by harnessing the kinetic energy created by the rise and falls of the tides.

Explanation:

I already gave you the answer this morning but here's the answer again

Answer:

led

Explanation:

Paint is kind of synthetic chemical product.

Paint is any colored liquid, liquefiable, or solid mastic substance that solidifies after being applied in a thin layer to a substrate.

Pigments, binders, solvents, and additives are the four major components of all paints. Binders work to "bind" the pigments together and create the paint film, while pigments offer color and conceal. Additives are substances that give certain paint features such as mildew resistance, while solvents are liquids that suspend the components and allow you to deposit the paint on the surfaces. All four elements work together to create paint that is tailored to your exact design requirements.

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Answer:

Negative effects of weed-killer-resistant crops can include decreased diversity and abundance of wild plants, problems with grain contamination, segregation and introgression of herbicide-resistant traits, and marketplace acceptance, resulting in an increased reliance on herbicides for weed control.

Explanation:

I hope this helps!

The correct answer to the question is option (A)- Adaption to arid environment. C4 and CAM plants are adaptations to arid environment. Arid environment is the environment which has no water for the plants that grow in it.

Answer:

1. The vernal equinox

- happens around March 21st

- has days and nights of equal length

2. In the southern hemisphere, the longest day happens during

- June

3. During the winter in the northern hemisphere

- the days are shorter than during summer

Answer:

1)the vernal equinox happens around March 21st

2)in the southern hemisphere the longest day of the year happens during december

3)The days are shorter then during the summer.

Explanation:

pH of solution A is 12.5 and it is the most basic (alkaline) among all.

Those solution which are having value more than 7 in the pH scale shows the basic character and relation between pH & pOH will be represented as:

pH + pOH = 14

Now we calculate the pH for given solutions:

For solution A, pOH = 1.5

pH = 14 - 1.5 = 12.5

For solution B, pOH = 7

pH = 14 - 7 = 7

For solution C, pOH = 13.5

pH = 14 - 13.5 = 0.5

Value of pH for solution A is highest and shows basic nature, solution B is neutral and solution C is acidic in nature.

Hence, solution A is most basic.

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Answer: A

Explanation: The water vapors after condensation are turned into water droplets which are inside the clouds, moving around the world.

Answer:

This can be done with Python. If you learn machine learning, you can use python to automate your computers to do things.

I hope this answers you. If not, I may change something accordingly.

Answer:

In science class me and my brother had a stem fair project where we had to find out the independent variable of our project

When water becomes ice it becomes a dependant variable

Explanation:

Explanation:

manganese(11)

chloride =color pink

tetrahydate

copper(11)

chloride =color blue green

dihydrate

nickel(11)

chloride =color green

hexahydrate

Answer:

Explanation:

Iron(II) sulphate crystals are green.

Solid Ferric, ( Fe(III) chloride is brown.

Copper Sulphate is blue.

Calcium Sulphate is white.

Barium Sulphate is white.

Answer:

1= simple distillation

2 - elements contain just one type of atom ; compounds contain atoms of at least two different elements , which have been chemically combined or bonded

Explanation:

hope this helps

Answer:

chromotragraphy

because it has mixture of compounds and elements

i think these are the answers

Explanation:

Answer:

A balanced equation is a chemical equation where there are equal numbers of atoms of each element on both sides of the equation.

A chemical equation that has a equal amount of each

each element on the left and right sides

Answer:

D = 5.3 g/mL

Explanation:

Density = Mass over Volume

D = m/V

Step 1: Define

D = unknown

m = 16 g

v = 3.0 mL

Step 2: Substitute and Evaluate

D = 16 g / 3.0 mL

D = 5.333333333 g/mL

Step 3: Simplify

We have 2 sig figs.

5.333333333 g/mL ≈ 5.3 g/mL

Answer:

True

Explanation:

Temperature is a direct measure of thermal energy, which means that the hotter an object is, the more thermal energy it possesses. The amount of thermal energy transferred between two systems is measured as heat. It is simple to convert mechanical energy to thermal energy, for example, through friction.

Answer:

False.

Explanation:

I did this lesson and I clicked true and got it wrong.

Answer:

The answer is species diversity

Explanation:

Hope this helps:)......if not then sorry for wasting your time and may God bless you:)

Answer:

oxygen obey the octet rule when reacting to form compounds by adding 2 electrons.

Explanation:

Answer:

See below.

Explanation:

An oxygen atom, in free state has 8 electrons, 2 in the first shell, and 6 in the second. It can only achieve stability if the valency of the valence shell is 0. In order for this, it combines with another atom with the same valency, such as magnesium or another oxygen atom to obey the octet rule. Hope it helps.

Answer:

Some neutral substances that are the most well known are: water, table salt, sugar solution and cooking oil.

Hope this helps! :D

Answer:

[tex]\huge\boxed{\sf 1.51\ L}[/tex]

Explanation:

From the reaction:

2 moles of Na produce 1 mole of H₂

Converting 3.10 g of Na into moles:

Moles = mass / molar mass

= 3.10 / 23

= 0.135 mol

From the reaction:

2 Na = 1 H₂

1 Na = 1/2 H₂

1 Na = 0.5 H₂

1 mol of Na = 0.5 mol of H₂

0.135 mol of Na = 0.5 × 0.135 mol of H₂

0.135 mol of Na = 0.067 mol of H₂

So, 0.135 mol of Na (3.10 g) produce 0.067 mol of H₂

Convert 0.067 mol of H₂ into L:

= mol × molar value

[molar value = 22.4 L/mol]

= 0.067 × 22.4

= 1.51 L

[tex]\rule[225]{225}{2}[/tex]