I NEED HELP PLEASE ASAP THANK YOU!

Answer:

It's D. Francium

Explanation:

Atomic radii vary in a predictable way across the periodic table. The atomic radius increases from top to bottom in a group and decreases from left to right across a period. Thus, Helium is the smallest element, and Francium is the largest.

Answer:

b

Explanation:

b because it's a physical change

Answer:

sup

Explanation:

Answer:

If i had to take a stab at it would say C

Explanation:

Answer:

I think it might be C but not 100% sure.

Explanation:

When the object transmits all color frequencies.

Answer:

2276.1 Joules

Explanation

One calorie is equal to 4.184 Joules. So, 544 calories will be equal to 544*4.184=2276.1 Joules

Answer:

pluto is considered a dwarf planet because it did not meet the three criteria the IAU uses to define a full sized planet

Explanation:

Answer:

There is actually 1 mole in 54.3 g of CO2

Answer:

C

Explanation:

Mostly all of them but most likely C

Answer:

d is the answer.........

In the balanced equation, the mass of reactant is exactly equal to the mass of product. The respective coefficients needed to balance the equation is N₂(g) + 3H₂(g) ⇒ NH₃(g) .

A chemical equation that is balanced has equal amounts of each element's atoms on both sides of the equation and conserves mass.

Because mass cannot be generated or destroyed, according to the rule of conservation of mass, a chemical equation must always be in balance.

The Law of Conservation of Mass is followed by a balanced equation. This is a crucial scientific guiding principle. Finally, a balanced equation enables us to forecast the quantity of reactants and products that will be produced. Sort of crucial if you're attempting to determine how much fuel to supply a spacecraft traveling to Mars

Thus, the balanced equation is N₂(g) + 3H₂(g) ⇒ NH₃(g) .

To learn more about balanced equation, follow the link;

https://brainly.com/question/7181548

#SPJ2

Answer:

sandstone

Explanation:

Sandstone is a mineral rock made of small particles.

Answer: i think it’s two recessive alleles

Explanation:

Answer:Two recessive alleles is correct

Explanation:

I TOOK THE TEST (k-12 student) TwT

Answer:

I think C But I can't really see it well

Answer:

what is your question sorry cause I don't trust hope you understandanymore feel free tell me your question you are struggling with l be glad to help you

Answer:

its nuber 3

wdPDAPS

Explanation:

Answer:

This lifespan began roughly 4.6 billion years ago, and will continue for about another 4.5 – 5.5 billion years, when it will deplete its supply of hydrogen, helium, and collapse into a white dwarf.

Explanation:

Got this from the internet lol

Answer:

gamma rays

Explanation:

gamma Ray's have the highest frequency

Answer:

Eukaryotes

Explanation:

Answer:

f

Explanation:

Answer:

94.1 %

Explanation:

We firstly determine the equation:

2H₂O + O₂ →  2H₂O₂

2 moles of water react to 1 mol of oxygen in order to produce 2 moles of oxygen peroxide.

We convert the mass of oxygen to moles:50 g . 1mol /32g = 1.56 mol

Certainly oxygen is the limiting reactant.

2 moles of water react to 1 mol of oxygen.

13 moles of water may react to 13/2 = 6.5 moles. (And we only have 1.56)

As we determine the limiting reactant we continue to the products:

1 mol of O₂ can produce 2 moles of H₂O₂

Then 1.56 moles of O₂ will produce (1.56 . 2) = 3.125 moles

We convert the moles to mass: 3.125 mol . 34 g/mol= 106.25 g

That's the 100% yield or it can be called theoretical yield.

Percent yield = (Yield produced / Theoretical yield) . 100

(100g / 106.25 g) . 100 = 94.1 %

Answer:

30

Explanation:

Given :

A sample of unknown gas has a temperature of 378 K.

[tex]T_i = 378 \ K , \ T_f = 546 \ K[/tex]

When the temperature is increased to 546 K, the volume also increases to 1047 ml.

[tex]V_f - V_i = 1047 \ ml[/tex]

Solution :

We know, temperature is directly proportional to volume.

[tex]\dfrac{T_i}{T_f}=\dfrac{V_i}{V_f}\\\\\dfrac{T_i}{T_f} = \dfrac{V_i}{1047 + V_i}\\\\\dfrac{V_i}{1047+V_i}=\dfrac{378}{546}\\\\546V_i = 378V_i + 378\times 1047\\\\168V_i = 3,95,766\\\\V_i = 2,355.75\ ml[/tex]

Therefore, the original volume is 2.355.75 ml.

Answer:

Sand and silt can be carried in suspension.

Explanation:

For example, sand and silt can be carried in suspension in river water and on reaching the sea bed deposited by sedimentation; if buried, they may eventually become sandstone and siltstone (sedimentary rocks) through lithification.

Answer:

it means 2 oxygen atoms in the molecule

Explanation:

Answer:

the mass of the glycerine needed in the given solution is  23.92 g

Explanation:

Given;

molarity of the solution (C₃H₈O₃), C = 2.60 M

Volume of the solution, V = 100 mL = 100 x 10⁻³ L = 0.1 M

The molarity of a solution is given as follows;

[tex]Molarity = \frac{amount \ of \ solute \ (moles)}{volume \ of \ solution \ (L)} \\\\amount \ of \ solute \ (moles) = Molarity \ \times volume \ of \ solution \ (L)\\\\amount \ of \ solute \ (moles) = 2.6 \times 0.1 \\\\amount \ of \ solute \ (moles) = 0.26 \ mole[/tex]

The molecular mass of the given solution;

molecular mass = (12 x 3) + (8 x 1) + (16 x 3)

molecular mass = 92 g/mol

The mass of the glycerine needed in the given solution is calculated as follows;

reacting mass = amount of solute (moles)   x   molecular mass (g/mol)

reacting mass = 0.26 x 92

reacting mass = 23.92 g

Therefore, the mass of the glycerine needed in the given solution is  23.92 g