How many moles are present in 450 grams of sodium phosphide, Na3PNa3P?
a. 450 moles
Selected:b. 99.9 moles
c. 44,995 moles
d. 4.50 moles
Answer:
4.5moles
Explanation:
Given parameters:
Mass of Na₃P = ?
Unknown:
Number of moles = ?
Solution;
The number of moles in a given substance can be derived from the expression below;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of Na₃P = 3(23) + 31 = 100g/mol
Number of moles = [tex]\frac{450}{100}[/tex] = 4.5moles
Help!!!
Question 1: Sediment is usually deposited by the stream at locations where the stream
A. increases in potential energy
B. decrease in velocity
C. increases in slope
D. decrease in width
Question 2: Sediment is usually deposited by the stream at locations where the stream
A) increases in potential energy
B) decreases in velocity
C) increases in slope
D) decreases in width
PLEASE HELPP!!!!
10. Using a Periodic Table, complete the chart below. Then, use the simulation to check your
answers by clicking on the appropriate elements to make each compound.
Answer:
Na the valency electrons is 1
The ion charge is positive 1
K the valency electrons is 1
The ion charge is positive 1
Explanation:
Mg the valency electron is 2 The ion charge is positive 2
Ca the valency electron is 2 The ion charge is positive 2
Al the valency electron is 3 The ion charge is positive 3
O the valency electron is 2 The ion charge
is negative 2
F the valency electron is 1 The ion charge is negative 1
Cl the valency electron is 1 The ion charge
is negative 1
N the valency electron is 3 The ion charge is negative 3
S the valency electron is 2 The ion charge is
negative 2
Na the valency electrons is 1, The ion charge is positive 1 and K the valency electrons is 1, The ion charge is positive 1.
What is Valency?Mg the valency electron is 2 The ion charge is positive 2, Ca the valency electron is 2 The ion charge is positive 2 and Al the valency electron is 3 The ion charge is positive 3.
O the valency electron is 2 The ion charge, is negative 2 and F the valency electron is 1 The ion charge is negative 1, Cl the valency electron is 1 The ion charge is negative 1
N the valency electron is 3 The ion charge is negative 3, S the valency electron is 2 The ion charge is negative 2.
Therefore, Na the valency electrons is 1, The ion charge is positive 1 and K the valency electrons is 1, The ion charge is positive 1.
To learn more about valency, refer to the link:
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When a liquid freezes into a solid, the particles of the substances *
lose energy
gain energy
move faster
disappear
Answer:
Lose energy
Explanation:
The molecules are moving from a liquid (molecules slide past one another) to a solid (molecules barely move) so are losing energy
can someone explain what a water table is ? :)
Answer:
It is where the water lies underground
During a chemical reaction, a new ___________ is formed. what is formed
Calculate the acceleration of Josh riding his bicycle in a straight line that speeds up from 4 m/s to 6 m/s in 5 seconds. Initial Speed ____. Final Speed ______. Time ______. Acceleration =________
Answer:
Initial Speed ____4m/s. Final Speed ______6m/s. Time ______5 seconds . Acceleration =________0.4m/s²
Explanation:
The acceleration is the rate of change of velocity during time t .
acceleration = Final velocity- Initial velocity/ Time
= Vf- Vi/ t
a = Δv/ Δt
= 6m/s- 4m/s/ 5s
= 2m/s/ 5s
= 0.4m/s²
It can also be defined as the difference of the initial and final velocity ( velocities measured in meters per second) during the given time t measured in seconds .The SI unit of acceleration is meter per second squared.
If the velocities are not measured in meters per second or time is not measured in seconds then the units are changed accordingly.
Put the following elements into five pairs of elements that have similar chemical reactivity: F, Sr, P, Ca, O, Br, Rb, Sb, Li, S
Explanation:
Given elements:
F, Sr, P, Ca, O, Br, Rb, Sb, Li, S
Elements with the same chemical reactivity will belong to the same group on the periodic table. This implies that elements in the same column will have the same reactivity;
Li and Rb are both alkali metals in group 1
Ca and Sr are both alkali earth metals in group 2
F and Br are halogens in group 7
O and S are group 6 elements
P and Sb are both in group 5 on the periodic table
So these groupings show elements with the same chemical properties.
The following elements can be put into five pairs of elements that have similar chemical reactivity in the following ways: F and Br, Sr and Ca, P and Sb, O and S, Li and Rb.
The periodic table shows and displays the tabular arrangement of atomic elements as they are categorized into groups and periods. Elements in the same groups exhibit certain chemical properties and reactivity with one another.
On the periodic table;
Fluorine F and Bromine Br are elements of the halogen family. They are highly electronegative in nature and exhibit similar reactivity.Sr and Ca are alkaline earth metals. They are found in group two (2). Their oxidation state is +2P and Sb are located on group 5 of the periodic table and they tend to share some similar chemical reactivity.O and S are nonmetals and they can be found in group 6 with -2 oxidation state.Li and Rb are alkali metals, they form ionic bonds with the halogen family.Therefore, we can conclude that we've fully understood the concept of how chemical reactivity works with elements that are grouped in the same group.
Learn more about chemical reactivity here:
https://brainly.com/question/9621716?referrer=searchResults
How do you think wind can erode materials
Answer:
wind can carry sand and dirt in the air. if the sand or dirt hit a material repeatedly, the material can break down after being hit multiple times. with this, materials can erode.
Explanation:
PLEASE I NEED HELP IN CHEMISTRY
Answer:
2. 232 & 86
Explanation:
Heeeelp,,, serious answers only pls i dont wanna hear about your love life
