Please help hurry

Pleas help me

Answer:

it would be an element because its an element

Explanation:

Answer:

Explanation:

In order to find the original volume we use the same for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the original volume

[tex]V_1 = \frac{P_2V_2}{P_1} \\[/tex]

From the question

P1 = 172 kPa = 172000 Pa

P2 = 85 kPa = 85000 Pa

V2 = 3 L

We have

[tex]V_1 = \frac{85000 \times 3}{172000} = \frac{255000}{172000} = \frac{255}{172} \\ = 1.482558139...[/tex]

We have the final answer as

Hope this helps you

[tex]\huge\pink{Answer}[/tex]

0.0006 in scientific notation is 6 × 10-4

All numbers in scientific notation or standard form are written in the form

m × 10n, where m is a number between 1 and 10 ( 1 ≤ |m| < 10 ) and the exponent n is a positive or negative integer.

To convert 0.0006 into scientific notation, follow these steps:

Move the decimal 4 times to right in the number so that the resulting number, m = 6, is greater than or equal to 1 but less than 10

Since we moved the decimal to the right the exponent n is negative

n = -4

Write in the scientific notation form m × 10n

= 6 × 10-4

Therefore,

6 × 10-4 is the scientific notation form of 0.0006 number and 6e-4 is the scientific e-notation form for 0.0006

Answer:

-56.1kJ/mol

Explanation:

The reaction between HCl and NaOH is:

NaOH + HCl → NaCl + H₂O + ΔH

Where ΔH is heat change in  the reaction.

As the temperature of the solution increases, the heat is released and ΔH < 0

The heat released in the reaction is obtained using coffe-cup calorimeter equation:

Q = C×m×ΔT

Where Q is heat

C is specific heat of the solution (4.184J/g°C)

m is mass of solution: Assuming density = 1g/mL, 100mL of solution = 100g

And ΔT is change in temperature (13.4°C)

Replacing:

Q = C×m×ΔT

Q = -4.184J/g°C×100g×13.4

Q = -5606.6J

Now, in the reaction you have:

Moles HCl:

0.050L * (2.2mol/L) = 0.11 moles

Moles NaOH:

0.050L * (2.0mol/L) = 0.1 moles

That means the moles of reaction are 0.1 moles, and heat change in the chemical reaction is:

5606.6J / 0.1 mol = 56066J =

Answer:

Distillation

Explanation:

By using the method of distillation we'll identify if there is other properties of liquid by looking the temperatures,the ordor or the boiling point.

Answer: A = 1560

               B = 1.6

Explanation: brainlest please

Answer:

strontium salts, lithium salts, lithium carbonate, Li2 CO3 = red, white­hot metal, such as magnesium or aluminum, barium oxide, BaO = white, copper compounds + chlorine producer, copper acetoarsenite (Paris Green), Cu3 As2 O3 Cu(C2 H3 O2 )2 = blue. We will need a metal chemical, so that when it is heated it will produce the incandescent to make the fountain effect.

Explanation:

^^

Answer:

Cobalt (II) Carbonate

Explanation:

Answer:B

Explanation:

Answer: it should be 2.8

Explanation:

Answer:

hi

Explanation:

how r u today

Answer:

0.00310

Explanation:

Answer:

The purpose of the Parados is to add an explanation of events that happened before the play begins. In the first section the mood is triumphant because of the recent battle win. Then it jumps back to the beginning of the battle and the mood is scared. Before the army lead by the brother of the king could attack they are forced to retreat and the army counterattacks. Unfortunately, the brothers kill each other during the battle. The people of Ancient Greece believed that Zeus and Ares were on their side and used the gods as the excuse for winning a battle. The story ends victorious but sad tone because the two brothers have slain each other.

Explanation: Gets you 100%

Answer:

it is a compound

Explanation: i have it on a test

Answer:

B. Iron

Explanation:

It is element number 26 on the periodic table.

Answer:

Iron is an element because it is a pure substance, air is a mixture, salt and sugar are compounds.

Answer:

1:MgCO3 (s) + 2 NaNO3

2:agcl(s)+kno3(aq)

3:alcl3(aq)+h2(g)

4:NaNO3 + CO2 + H2O

(not sure abt last one)

Answer:

0.840

Explanation:

The 100 grams of KBr have been equivalent to 0.84 moles. Thus, option A is correct.

The moles can be defined as the mass of the compound with respect to the molecular mass. The moles can be given as:

Moles = [tex]\rm \dfrac{weight}{Molecular\;weight}[/tex]

The molecular weight has been the mass of the constituents of the atoms present in the compound.

The compound KBr has a molecular mass of 119 g/mol.

The given mass of the compound has been 100 grams.

The moles of KBr can be given as:

Moles of KBr = [tex]\rm \dfrac{100}{119}[/tex]

Moles of KBr = 0.84 moles.

The 100 grams of KBr have been equivalent to 0.84 moles. Thus, option A is correct.

For more information about the moles, refer to the link:

https://brainly.com/question/2437143

Answer:A. Direction

C. Resistance

Explanation:

Forces are due to an interaction of at least two objects. It may change the state of motion of an object. It may change the shape of an object. Forces applied on an object in the same direction add to one another and the resultant is in the same direction.

plz mark brainliest

Answer:

drill bits

Explanation:

I don't think that you would use gemstones in anything else.

Answer: Sieving

Im 100% sure its the answer!

Answer:

Pure Substance. A sample of matter, either a single element or a single compound, that has definite chemical and physical properties. Element. A pure substance that cannot be broken down into other substances by chemical or physical means.

Explanation:

Sorry if it's wrong!!!!!!!

Answer:

Elements

Explanation:

Elements cannot be broken down into anything simpler physically or chemically. Compounds: are pure substances that are made up of more than l type of atom and can be broken down or decomposed into its individual elements by chemical methods, but cannot be separated by physical methods.

An electron moved from a lower energy level to a higher energy level, and during the transition, a random amount of light was released. Option A

An electron is a kind of subatomic particle that has a negative charge. It is possible for it to be free (meaning that it is not associated with the nucleus of any atom) or it may be tied to the nucleus of an atom.

Electrons are sub-atomic particles that may be found in each atom of any chemical element and can occupy different energy levels. These electrons are capable of transitioning between different energy levels.

Electrons may transition from a state with a lower energy level, also known as the ground state, to a state with a higher energy level, also known as an excited state. Alternatively, electrons can transition from a state with a higher energy level to a state with a lower energy level.

When an electron goes from a lower energy level to a higher energy level, the atom takes in more energy, but when the electron moves from a higher energy level to a lower energy level, the additional energy is expelled mostly in the form of light.

Discover more about electrons by reading the following:

https://brainly.com/question/3461108

#SPJ1

Answer : The volume of solution is 0.884 L

Explanation :

Molarity : It is defined as the number of moles of solute present in one litre of solution.

Formula used :

[tex]Molarity=\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Volume of solution}}[/tex]

Solute is, [tex]KNO_3[/tex]

Given:

Molarity = 0.750 M

Molar mass of [tex]KNO_3[/tex]  = 101 g/mole

Mass of [tex]KNO_3[/tex]  = 67.0 g

Now put all the given values in the above formula, we get:

[tex]0.750M=\frac{67.0g}{101g/mole\times \text{Volume of solution}}[/tex]

[tex]\text{Volume of solution}=0.884L[/tex]

Therefore, the volume of solution is 0.884 L

Answer:

what? what's the full question?

Answer:

Metalloids are brittle like Non-Metals

Explanation:

Answer:

The total volume of water is 222 ml.

Explanation:

Given that,

Volume of water by  different devices are,

First large cylinder =164 ml

Second small cylinder = 39.7 ml

Third calibrated burette = 18.16 ml

We need to calculate the total volume of water

Using given data

volume of total water=volume by large cylinder+volume by small cylinder+volume by calibrated burette

Put the value into the formula

[tex]V_{w}=164+39.7+18.16[/tex]

[tex]V_{w}=221.8\approx 222\ ml[/tex]

Hence, The total volume of water is 222 ml.

Answer:

Independent variable: BROOM

Dependent variable: ACCELERATION

Control variable: same distance

Find the definition of replicate below

Explanation:

In an experiment, the independent variable is the variable that is changed or manipulated by the experimenter. In this case, the independent variable is the BROOM.

The dependent variable is the variable that is measured in an experiment. It is the variable that responds to the independent variable. The ACCELERATION is the dependent variable in this case.

The control variable is the variable that is kept constant or unchanged throughout the experiment. In this case, the control variable is the SAME DISTANCE traveled for each broom.

A replicate is a repeated experiment with the expectance of a similar or consistent result. In this case, if the brooms are switched, the acceleration of each broom should be the same in the replicate result.

Answer: D

Explanation:

It is the most likely one

Explanation:

sorry if you get it wrong but I think its b