How simple machines make our works easier and faster (Question answer) (Class-6)

Answer:

Option C (1.2 L) is the correct option.

Explanation:

The given values are:

Pressure,

[tex]P_1=1.9 \ atm[/tex]

[tex]P_2=3.8 \ atm[/tex]

Volume,

[tex]V_1=2.3 \ L[/tex]

[tex]V_2=?[/tex]

As we know,

The gas equation is:

⇒  [tex]PV=nRT[/tex]

At constant temperature,

⇒  [tex]P_1 V_1=P_2 V_2[/tex]

or,

⇒      [tex]V_2=\frac{P_1 V_1}{P_2}[/tex]

By substituting the values, we get

⇒           [tex]=\frac{1.9\times 2.3}{3.8}[/tex]

⇒           [tex]=\frac{4.37}{3.8}[/tex]

⇒           [tex]=1.15 \ L[/tex]

or,

⇒           [tex]=1.2 \ L[/tex]

Answer:

6.941 u

Explanation:

Answer:

6.1 M

Explanation:

Step 1: Calculate the moles of HNO₃ in the initial solution

A student has 475 mL (0.475 L) of a 4.5 M HNO₃ (4.5 mol HNO₃/ L) solution.

0.475 L × 4.5 mol HNO₃/ L = 2.1 mol HNO₃

He leaves the top of the container open, so water will evaporate, but the moles of HNO₃ will remain the same.

Step 2: Calculate the final concentration of the solution

2.1 moles of HNO₃ are in 347 mL (0.347 L) of solution.

[HNO₃] = 2.1 mol / 0.347 L = 6.1 M

Answer:

II would say there is co2 so i would say 30.4

Explanation:

Hope this helps

Answer:

P2 = 4.76 atm

Explanation:

Given:

T1 = 235K. P1 = 3.80 atm

T2 = 298K. P2 = ?

Here, we use Gay-Lussac's law:

P1/T1 = P2/T2

Solving for P2, we get

P2 = (T2/T1)P1

= (298K/238K)(3.80 atm)

= 4.76 atm

Explanation:

asexual reproduction involves 1 parent and produces offspring that are genetically identical to each other and parent.

Sexual reproduction involves 2 parents and produces offspring that are genetically unique.

Answer:

"When two or more elements combine to form more than one compound, the mass of one of them, which joins the fixed mass of the other, is in relation to whole numbers and simple" Example: The carbo

Answer:

2Cu2O + C --> 4Cu + CO2

Explanation

The Law of conservation of Mass states You can not destroy or create math in a chemical reaction, meaning you must have the same amount at the beginning and the end. This equation keeps the same amount of atoms on both sides.

Answer: Yes, it is a balanced equation.

Explanation:

https://chemequations.com/en/?s=Cu2O+%2B+C+%3D+Cu+%2B+CO2

This is where I got the answer so you know.  Hope this helps :)

Answer:

9 protons

Explanation:

By looking at the periodic table, you will see that Fluorine has 9 protons. Since the number of electrons equal the number of protons, Fluorine has 9 electrons as well. Meanwhile, it's mass number of 19, minus 10 neutrons, gives you 9 protons or electrons. Hence, the atom would be Fluorine.

hope u make me brainlesst ʘ‿ʘ

Answer:

i think so for this i will 9 protons . atomic mass is 19. 10 neutrons

Answer:

the result is C and D. those are the ansers

Answer:C & D

Explanation:

Just took the test

The nitrogen gas and the oxygen gas will both occupy 50 liters.

Let us recall form the kinetic theory of gases that a gas is in constant random motion. The gas does not have a specific volume but takes on the volume of the container since it will expand and fill the container.

The volume occupied by the two gases will be the same as the volume of the container. Hence, the nitrogen gas and the oxygen gas will both occupy 50 liters.

Learn more about volume of a gas: https://brainly.com/question/4519953

Answer:

B. The entire container because gases will expand to fill it.

Explanation:

I took to test, plus it directly says this in the lesson

Answer : A. 3

Explanation:

3Al(s) + 3O2(g) → 3Al2O3(s)

This is the right Answer :3

I hope you are having a great day :3

Answer

false

Explanation:

hope it helps.......

This is a false statement!

In the symbolic equation, chemical formulas are used instead of chemical names for reactants and products, while symbols are used to indicate the phase of each substance. It should be apparent that the chemical shorthand method is the quickest and clearest method for writing chemical equations.

Answer:

To find the relative formula mass (M r) of a compound, you add together the relative atomic mass values (A r values) for all the atoms in its formula.

Explanation: Find the M r of carbon monoxide, CO. Find the M r of sodium oxide, Na 2O. The relative formula mass of a substance, shown in grams, is called one mole of that substance.

Explanation:

amount of baking soda = 2.01 g

---> 2.01 g NaHCO3 × (1 mol NaHCO3/84.007 g NaHCO3)

= 0.024 mol NaHCO3

mass of the product = 1.28 g

Possible reactions:

NaHCO3(s) ---> NaOH(s) + CO2(g)

0.024 mol NaHCO3 × (1 mol NaOH/1 mol NaHCO3)

= 0.024 mol NaOH × (39.997 g NaOH/1.mol NaOH)

= 0.96 g NaOH

2NaHCO3(s) ---> Na2O(s) + 2CO2(g) + H2O(g)

0.024 mol NaHCO3 × (1 mol Na2O/2 mol NaHCO3)

= 0.012 mol Na2O × (61.9789 g Na2O)

= 0.73 g Na2O

2NaHCO3(s) ---> Na2CO3(s) + CO2(g) + H2O(g)

0.024 mol NaHCO3 × (1 mol Na2CO3/2 mol NaHCO3)

= 0.012 mol Na2CO3 × (105.9888 g Na2CO3/1 mol Na2CO3)

= 1.27 g Na2CO3

Conclusion:

Based on the mass of the product in the crucible and comparing it with the predicted product mass in different reactions, I conclude that Na2CO3 is the most likely product in the crucible.

Answer:

4.17M

Explanation:

m1v1/m2v2=n1/n2

Answer:

Normal cells are either repaired or die (undergo apoptosis) when they are damaged or get old. Cancer cells are either not repaired or do not undergo apoptosis.

Explanation:

Answer:

Explanation:

This is an example of a limiting reactant question, and is very common as a general chemistry problem.

We first see the balanced equation, that is:

2CuCl2+4KI→2CuI+4KCl+I2

We first need to find the limiting reactant

We see that 0.56 g of copper(II) chloride (CuCl2) reacts with 0.64 g of potassium iodide (KI) . So, let's convert those amounts into moles.

Copper(II) chloride has a molar mass of

134.45 g/mol . So in 0.56 g of copper(II) chloride, then there exist

0.56g134.45g/mol≈4.17⋅10−3 mol

Potassium iodide has a molar mass of

166 g/mol . So, in 0.64 g of potassium iodide, there exist

if it wrong i am sorry

Answer:

100 L

Explanation:

Use Boyle's Law, p1v1 = p2v2.

p1 = 4 atm

v1 = 50L

p2 = 2 atm

v2 = ?

p1v1 = p2v2

(4 atm) (50L) = (2 atm) (v2)

v2 = (4 atm)(50L) / (2 atm) = 100 L

Answer:

Copper(II) oxide is a metal oxide that has the formula CuO. It has an ionic structure. It contains a copper(2+). Cupric oxide, or copper (II) oxide, is an inorganic compound with the chemical formula CuO.

Explanation:

I hope that helps you.

Answer:  Therefore, to melt 2kg of ice 835. 48kJ of heat is required.

Explanation:

I hope this helps!

starchy sugar filled foods contain carbohydrates since carbohydrates are sugar chains

Answer: northern hemisphere

Explanation: I looked it up. Plus I took a test with this question and when the teacher went over the answer i got it right.

Answer:

A. The samples contain the same substances in a variety of proportions.

Explanation:

Answer:

1

Explanation:

Answer:

D

Explanation:

Because it has equal number of elements on each side of the arrow