PLEASE HELP DUE IN EXACTLY 15 mins!! i will give you branliest

The energy transformations are similar because they both involve transformations that

blondinia [14]

Sorry but I don’t understand the question. Sorry I’m not any help

3 0

2 years ago

What number do you never write as a coefficient?

N76 [4]

Answer:

When no coefficient is written in front of a formula it is assumed to be 1. 4. Numbers appearing in the formulas are known as subscripts. These can never be changed when balancing the equation or you will change the identity of the substance.

Explanation:

1. Reactants go on the left hand side and products go on the right hand side of a chemical equation. Be sure to write the correct formulas for the reactants and products.

· Remember atoms are conserved in a chemical reaction. ie they are neither created or destroyed. So all the atoms in the reactants must end up somewhere among the products.

2. Count the number of atoms of each element, compound or ion in the reactants and products. If they are not equal proceed further.

3. Balance the atoms one at a time by placing coefficients in front of the formula so that the numbers of atoms of each element are equal on both sides of the equation. Remember atoms may exist in an element, compound or ion.

· It is usually easier to start with the atoms that occur in only one substance on each side of the equation.

· Balance the atoms that occur in compounds before attempting to balance atoms that occur in elemental form. e.g. H2, O2 or Cl2

· To make it easier if a polyatomic ion appears unchanged on both sides of the equation treat it as a whole unit.

· When no coefficient is written in front of a formula it is assumed to be 1.

4. Numbers appearing in the formulas are known as subscripts. These can never be changed when balancing the equation or you will change the identity of the substance.

· Remember with subscripts, any number to the right of parentheses multiplies each subscript within the parentheses.

eg Fe2(SO4)3 contains 2 Fe atoms, 3 S atoms and 12 O atoms.

5. Finally make sure that all the coefficients are in the smallest possible whole number ratio.

4 0

2 years ago

Help !!!! i believe they are multiple choice so please pick all that apply

irina1246 [14]

Answer:

Moving the magnet faster

7 0

2 years ago

Nickel (ni) has the fcc crystal structure, an atomic radius of 0.1246 nm, and an atomic weight of 58.69 g/mol. what is its theor

Vesnalui [34]

Note:
We will be calculating the density in units of gm/cm^3
Therefore, our standard units for this problem will be gram and cm

We are given that:
(1) Ni has an FCC structure, this means that: n = 4
(2) Ni has an atomic weight = 58.69 g/mol
(3) Ni has an atomic radius = 0.1246 nm

Now, the density of Ni can be calculated using the rule in the attached picture.
Examining the parameters in the rule, we will find that:
(1) n = 4
(2) A is the atomic weight of Ni = 58.69 g/mol
(3) Na is Avogadro's number = 6.022 * 10^23
(4) Vc is the number we want to calculate. We can find its value as follows:
Vc = a^3
a = 2R √2 where R is the radius = 0.1246 nm = 0.1256 * 10^-7 cm
Vc = (2R √2 )^3 = (√2 *2*0.1246*10^-7)^3
Vc = 4.377 * 10^-23

Now, we have all the parameters to substitute in the equation and get the theoretical density as follows:
theoretical density = [4*58.69] / [4.377 * 10^-23 * 6.022 * 10^23]
theoretical density = 8.9 gm / cm^3

Hope this helps :)

8 0

3 years ago

Why dont we include the mass of an atoms electrons in the atomic mass?

Oxana [17]

Because protons and neutrons are so much more massive than electrons, almost all of the atomic mass in any atom comes from the nucleus, which contains all of the neutrons and protons.

7 0

2 years ago