8.The number of protons plus neutrons is represented by the

a.atomic number
b.mass number
c.atomic mass
d.isotope

Answers

Answer 1

Answer:

c.atomic mass

Explanation:

The total number of protons plus neutrons is called the atomic mass number for the atom.

Related Questions

Magnesium bromide is prepared in a laboratory using the reaction below. Typically, the magnesium bromide is recoveted as a solid by heating way the remaining water
Mg(s) + 2 HB-(aq) - MgBrac) + H200)
If 0.940 mole of HBr in solution is added to 16.5 grams of Mgo in a beaker and then is heated until dry, what are the expected contents of the beaker?

Answers

Can you give more examples?

What is involved in creating genetically modified bacteria?
A. allowing them to reproduce freely
B. changing their food source
c. using biotechnology techniques
D. growing them on selected plants

Answers

bbbbbbbbbbbbbbbbbbbbbb

What is the percent composition of C4H10? (4 points)
44.6% C and 45.4% H
57.3% C and 42.7% H
82.7% C and 17.3% H
89.4% C and 10.6% H

Answers

Answer:82.7% C and 17.3% H

Explanation:

C4 = 12.0107g/mol x 4 = 48.0428 g/mol

H10 = 1.00794 g/mol x 10 = 10.0794 g/mol

Molar Mass of Butane, C4H10 = 48.0428 g/mol + 10.0794 g/mol= 58.1222 g/mol

percent composition of Carbon is = ( mass of carbon contained in butane / molar mass of Butane) x 100

=(48.0428 /58.1222) x 100% = 0.8265 x 100

=82.65% =82.7% of Carbon.

Percent composition of Hydrogen = (mass of Hydrogen contained in Butane / molar mass of Butane )x 100

( 10.0794/58.122 ) x 100% =0.1734 x 100

= 17.3% OF Hydrogen.

Answer:

C- 82.7% C and 17.3% H

Explanation:

I took the Quiz

True or false? Covalent molecules are formed when non-metal atoms share electrons with other non-metal atoms.

Answers

Answer:

true

covalent bonds are between non metals and nonmetals. and they are sharing electrons.

Question:
One of the properties we associate with diamonds is their luster. How would you define this
term?

Plz help?!

Answers

Answer:

luster means either sheen/glow or reflected light

Explanation:

luster is the appearance of mineral's surface in terms of light-reflective qualities

Plz help I need the answer now!! Which statement is best supported by the evidence on the map?
A. Oil is produced mostly in the southern part of Africa.
B. Gold is found in every country in Africa.
O
C. Iron ore is found mostly in northern Africa.
D. Each country in Africa has about the same amount of each natural
resource.

Answers

Answer:

I'd say C. You can eliminate the rest of the answers and get C. Most of the iron is found up North on the map.

Explanation:

HEY Plzzzzzzzzzzz HELP ILL GIVE BRAINLIEST ASAPPPPPPPPPPP

Answers

1. Equal
2. Properties
3. Heat
4. Reverse

How do you solve -8r=240

Answers

Answer:

You solve that dividing beach term by -8 and simplifying which for this answers will give you r=-30

Explanation:

Pls correct me if I’m wrong.

Hope this helps :)

BRIANLIEST!!!!!!
Use the mass to calculate the number of moles in a 347.89 g samples of ammonium

Answers

Answer:

20.46 moles

Explanation:

1 mole of NH3 contains 17gm of NH3

so 347.89 gm of ammonia is in,

347.89/17 moles

=20.46 moles

NOTE. There should be ammonia instead of ammonium in question because ammonium is an ion not a compound.

If a substance melts at 20oC, what is its freezing point?

Answers

Answer:

It is difficult, if not impossible, to heat a solid above its melting point because the heat that ... in a solid are packed in a regular structure that is characteristic of that particular substance.

#carryONlearning

HELP HELP HELP HELP HELP HELP HELP HELP HELP

Answers

Answer:

Explanation:

I got this i am very smart

Answer:

The answer is 3) same mass more volume

Explanation:

Mass measures the amount of matter in a substance or an object.

Volume measures the amount of space that a substance or an object takes up.

If you have 90L of water, what is the volume?

Answers

Answer:

900

Explanation:

What is the amount of diamine silver that can be formed when 10.00 g AgCl is mixed with 1.00 L of 0.100 M NH3?

Answers

The amount of diamine silver chloride = 8.87 g

Further explanation

Given

10 g AgCl

1.00 L of 0.100 M NH3

Required

the amount of diamine silver

Reaction

AgCl + 2 NH₃ → [Ag(NH₃)₂]Cl

mol AgCl :

= mass : MW

= 10 g : 143,32 g/mol

= 0.0698

mol NH₃ :

= M x V

= 0.1 x 1

= 0.1

NH₃ as a limiting reactant

mol [Ag(NH₃)₂]Cl based on NH₃ :

= 1/2 x mol NH₃

= 1/2 x 0.1

= 0.05

Mass diamine silver :

= 0.05 x 177.3822 g/mol

= 8.87 g

A chemist weighed out 2.9 g of nickel. Calculate the number of moles of nickel she weighed out. Be sure your answer has the correct number of significant digits.

Answers

Answer:moles = 2.9 g Ni × 1 mol Ni 58.69 g Ni = 0.0663 mol Ni

What is the molarity of the following solution? 3.48 mol in 4.1 L of solution

Answers

Answer:

molarity is moles/L so take the 3.48 and divide it by 4.1L

and get 0.848... and need to keep your answer to 2 digits as that is th emost precise measurement you have (the 4.1L)

so 0.85mol/L

Explanation:

Balance the following
Mn(NO2)2
+
BeCl2 →
Be(NO2)2 +
MnCl2

Answers

Answer:

Double Displacement (Metathesis)

Beryllium Chloride - BeCl2

Manganese(II) Chloride - MnCl2

Explanation:

Enter an equation of a chemical reaction and click 'Balance'. The answer will appear below

Always use the upper case for the first character in the element name and the lower case for the second character. Examples: Fe, Au, Co, Br, C, O, N, F. Compare: Co - cobalt and CO - carbon monoxide

To enter an electron into a chemical equation use {-} or e

To enter an ion specify charge after the compound in curly brackets: {+3} or {3+} or {3}.

Example: Fe{3+} + I{-} = Fe{2+} + I2

Substitute immutable groups in chemical compounds to avoid ambiguity.

For instance equation C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced,

but PhC2H5 + O2 = PhOH + CO2 + H2O will

Compound states [like (s) (aq) or (g)] are not required.

If you do not know what products are enter reagents only and click 'Balance'. In many cases a complete equation will be suggested.

Reaction stoichiometry could be computed for a balanced equation. Enter either the number of moles or weight for one of the compounds to compute the rest.

Limiting reagent can be computed for a balanced equation by entering the number of moles or weight for all reagents.

The balanced equation for the given reaction is:

[tex]\rm Mn(NO_2)_2 + 2BeCl_2 \rightarrow 2Be(NO_2)_2 + MnCl_2[/tex]

In chemistry, a balanced equation is a representation of a chemical reaction that follows the law of mass conservation. It assures that on both sides of the equation, the total number of atoms of each element remains constant.