Pls help with chemistry

Answer:

D the answer

Explanation:

Answer:

A

Explanation:

Classify objects in space

Answer: The mole, symbol mol, is the SI base unit of amount of substance. The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample.

Explanation:

Answer:

You can tell when a chemical change has happened when the chemical changes in appearance such as color or physical state.

Explanation:

If a change happens it can change in any way shape or form.

The mass of oxygen required to completely react with C₃H₈ is 0.091 grams.

Moles of any substance will be calculated as:

n = W/M, where

W = given mass

M = molar mass

Given chemical reaction is:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Moles of 0.025g of C₃H₈ will be calculated as:

n = 0.025g / 44.1 g/mol = 0.00056 moles

From the stoichiometry of the reaction it is clear that:

1 mole of C₃H₈ = react with 5 moles of O₂

0.00056 mole of C₃H₈ = react with 5×0.00056=0.0028 moles of O₂

Now we calculate the mass of oxygen by using the above moles and molar mass as:

W = (0.0028mol)(32.00 g/mol) = 0.0896g = 0.090g

Which is approx to the given valoe 0.091g.

Hence correct option is (d).

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6.5 g/cm³

Hi there !

density formula

d = m/V

1ml = 1cm³

= 26g/4cm³

= 6.5 g/cm³

Good luck !

Explanation:

To round to a significant figure:

Answer:look at the first non-zero digit if rounding to one significant figure.

look at the digit after the first non-zero digit if rounding to two significant figures.

draw a vertical line after the place value digit that is required.

look at the next digit.

Explanation: Google ;DDDD

The new volume is mathematically given as

V2= 16.12 L

Question Parameters:

A sample of gas has an initial volume of 20 L

and an initial pressure of 2.5 atm.

If the pressure changes to 3.1 atm

Generally, the equation for Pressure   is mathematically given as

P1V1 = P2 V2

2.5 * 20 = 3.1 * V2

V2 = 50/3.1

V2= 16.12 L

For more information on volume

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Answer:

ACIDS ARE WEAKER THAN WATER

Explanation:In general, alcohols are weaker acids than water because the OH group in alcohols is less polar than the OH group in the water. The electron releasing nature of the R group in alcohols decreases the polarity of the OH bond, which in turn decreases the acid strength of alcohols.

Answer:

This question is a little confusing but I believe its describing the actions of what Gizmo is doing with the water??

Explanation:

Answer:

The answer is salt

Explanation:

I got it right on the quiz

Answer:

A mole of carbon-12 atoms weighs 12 grams, and there are 6.022 x 1023 atoms in a mole. Dividing 12 grams by this incredibly large number of atoms tells us that one carbon-12 atom weighs 1.99 x 10-23 grams. Since a carbon atom weighs 12 AMU, one AMU is equivalent to 1.66 x 10-24 grams.

Explanation:

google.

Answer:

Are you studying?..............

Explanation:

lol

Answer:

The elements on the left-side of the periodic table are relatively electron deficient. So due to their comparatively low effective nuclear charges (the net positive charge of the protons minus the shielding core electrons below the valence level), their electrostatic hold on these electrons are weak.

Elements further right on the period table though,  have higher effective nuclear charges and stabilize electrons more effectively. Which leads to localized covalent bonding and the formation of molecules.

The right side contains non metals while the left side contains metals.

Metals lose electrons (negative electrons). They now have more protons,  therefore making the ion positive.

Non metals gain electrons (positive electrons). So the ion has more electrons than protons which makes the ion negative.

Explanation:

In order to find whether it will sink or float in water we must first find the density of the object

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

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

From the question

mass = 18 g

volume = 9 cm³

So we have

[tex]density = \frac{18}{9} \\ [/tex]

We have the density as 2.0 g/cm³

The object will sink in water since it's density is greater than that of water which is 1.0 g/cm³

Hope this helps you

Answer:

There aren't any options given. Maybe you should repost with options or just edit them in.

Answer:

What are some things that might happen that can change our air so that it is not health for plants?

Explanation:

Air pollutants have a negative impact on plant growth, primarily through interfering with resource accumulation. Once leaves are in close contact with the atmosphere, many air pollutants, such as O3 and NOx, affect the metabolic function of the leaves and interfere with net carbon fixation by the plant canopy. Air pollutants that are first deposited on the soil, such as heavy metals, first affect the functioning of roots and interfere with soil resource capture by the plant.

Answer:

The molecules having positively charged end and negatively charged end due to the difference in the charges of atoms present in the molecules are polar molecules. The molecules that do not have such separation of electric charges are nonpolar. Most of the polar molecules have an asymmetric or uneven distribution of electrons.

Explanation:

hope this helps

have an awesome day -TJ

may I please have brainliest

Answer:

The polarity of the individual bonds in the molecule

The arrangement of bonds around the molecule

Explanation:

Hope this helps

Answer: 22

Explanation:

Answer:

The answer is quartz!

Explanation:

It has a density of 2.6 g/mL, its color is Silver (variable), and its luster is glassy. It has a hardness of 7 and has a colorless streak.

Answer:

Oxygen causes oxidation. You can think about oxidation like rust on a car. Rust forms when the iron or steel in your car reacts with the oxygen in the air to form iron oxide. The resulting red substance can be quite brittle, so much so that you could literally poke a hole in it with your finger.

Answer:

Oxidation, which is the chemical reaction of oxygen with other substances, is very effective at weathering minerals that have iron in their chemical formulas. In other words, oxidation is what causes different types of rust.

Explanation:

Hope this helps! Good luck! <3

Change of state occurs when heat is supplied or removed from a substance.

Change of state refers to the changes that occur when a substance changes from one physical state to another due to changes in its temperature.

It is also known as phase change.

Phase Change can also be defined as change from one state to another without a change in chemical composition.

Some of the phase changes include:

The other terms associated with phase change include:

Learn more about change of state at: https://brainly.com/question/18372554

Answer:

Gas!

Explanation:

It can be conserved by keeping it underground, even though it's dangerous if you keep it underground too far down it can explode and cause the Earth to have an huge expplosiion or Earthquake to where the earth can shift it's tectonic plates and cause new areas to be moved, or gone. To deplete this gas, they use it in cars, stoves, etc. and they use it up to where there can be no more gas left. Even though there is still natural gas under the Earth''s surface it can still be found and depleted in different type of unique ways people discover.

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This might be the answer you were looking for informatically.

Answer:

a viewpoint is a person s way of thinking in general or particular things

Answer:one gram by 1oC

Explanation: you will need to know the value of water's specific heat

There are 10 protons, and 10 electrons in un-ionized neon. Hope this helped.

Answer:

cell

tissue

organ

organ system

Answer: 27.43 kPa

Explanation:

Use PV / T = PV / T →

P(.776) / (298) = (32.6)(.664) / (303) →

Cross Multiply to get: 235.128P = 6450.6272 →

Divide to get: P = 27.43 kPa :)

Answer:

b) free ions

Explanation:

when an ionic compound melts, the charged ions are free to move. Therefore, molten ionic compounds do conduct electricity.

Molten NaCl or sodium chloride conducts electricity due to the presence of free ions (B).