Answer:
5
Explanation:
A lithium atom with an atomic number of 3 and a charge of -2 will have a total number of electrons.
The atomic number is the number of protons in an atom. For a neutral atom that has not gained or lost electrons, the atomic number is the same as the number of electrons.
neutral atom: atomic number of electrons
For neutral atom of lithium, we will have 3 electrons
Now, lithium with a charge of -2 has gained two more electrons to the original 3 this now makes it 5.
ii.
It is an anion because it is negatively charged.
Negatively charged particles are called anion.
The depictions of ionic compounds do not show distinct compound units but rather a collection of ions in the ratio given by the formula. Explain how the drawing of NaCl both illustrates that the compound exists as a large collection of ions and that the ratio of sodium ions to chloride ions is 1-to-1 as indicated by the formula NaCl.
Answer:
The ionic compound NaCl has a Face Centered Cubic unit cell
The site for atoms are Face, center and Edges corner.
Effective number of atoms
Na+
1centers + 12edges x[tex]\frac{1}{4}[/tex] = 4 Na+
Cl-
6face x[tex]\frac{1}{2}[/tex] + [tex]\frac{1}{8}[/tex] x8 corners = 4Cl-
This is just one unit cell effective atom, there are thousand's of such unit cells are combined to form one such structure of NaCl. The real formula of NaCl is Na4Cl4 but for simplicity we use empirical formula that is NaCl.
Can someone tell me the answer and explanation plz
Hey, it'd be really cool if someone could help me with this-- 15 pts!
Complete and balance this chemical equation: NaClO3 ---> _____
Answer:
NaCI + O2= NaCIO3 I think
Jen wants to make a fair comparison of the reactivity if the metals with hydrochloric acid. What are the 2 variables that must be kept constant?
Answer:
the concentration of hydrochloric acid
the temperature in heating
Which of the following changes to gas particles in a box WILL NOT increase the pressure?
a. Adding more gas molecules
b. Raising the temperature
c. Increasing the volume of the container
Answer:
. Increasing the volume of the container
Explanation:
Does Phosphorus (P) gain/lose electrons to form ions
Answer:
phosphorous gain electron to form ions
Explanation:
For the most effective hot pack, should the Temperature change be positive or negative ?
Answer:
Positive
Explanation:
For the most effective hot pack, the temperature change should be positive.
Hot packs are generally utilized for their heat-producing abilities. Hence, the reactions leading to the activation of hot packs are usually exothermic, that is, heat energy generating. In other words, positive or increased temperatures must be generated when hot packs are activated.
This is unlike cold packs which are utilized for the cold-generating abilities. Reactions leading to their activations must be endothermic, that is, heat-absorbing.
Why do you think the spacecraft’s speed was different on the Monday, Tuesday, and Wednesday launches?
Answer:
I think because Moving an object against a stronger magnetic force transfers more energy to the magnetic field. Magnetic forces
are stronger closer to magnets. The Wednesday test launch stored more potential energy, and launched the
spacecraft at a faster speed because the stronger magnetic field closer to the magnet resulted in a greater
increase in potential energy.
Explanation:
what are drawn as arrows that are used to show both
size and direction.
two products of the recharge process are calcium and magnesium chloride. Based on your knowledge of bonding and oxidation states (not based solely on the article), what are the chemical formulas for the products of the recharge process? Report you answer with the most likely oxidation state.
Answer: The chemical formulas of calcium and magnesium chloride are [tex]CaCl_2[/tex] and [tex]MgCl_2[/tex]
Explanation:
A chemical formula is the representation of a substance in terms of chemical symbols showing the elements present in a compound and their relative proportion.
Calcium is having an atomic number of 20 has electronic configuration of [tex]1s^22s^22p^63s^23p^64s^2[/tex]. It can lose two electrons to have an oxidation state of +2.
Magnesium is having an atomic number of 12 has electronic configuration of [tex]1s^22s^22p^63s^2[/tex]. It can lose two electrons to have an oxidation state of +2.
Chlorine is having an atomic number of 17 has electronic configuration of [tex]1s^22s^22p^63s^23p^5[/tex]. It can gain one electron to have an oxidation state of -1.
Thus the chemical formulas of calcium and magnesium chloride are [tex]CaCl_2[/tex] and [tex]MgCl_2[/tex]
20 POINTS 7th garde science
Answer:
a
Explanation:
because look at the pic of the flower
Answer:
a
Explanation:
How many hydrogen atoms are on the Reactants side?
Answer:
two hydrogen atoms
In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products. If we count the number of hydrogen atoms in the reactants and products, we find two hydrogen atoms.
Can i get brainlisted please
Answer:
two hydrogen atoms.
Explanation:
the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products. If we count the number of hydrogen atoms in the reactants and products, we find two hydrogen atoms.
hope it helps : )
What do scientists use to describe a constellation? A.It’s boundary B. It’s brightest star C. It’s star pattern D. It’s story in Greek mythology
Answer:C
Explanation:
Because they use it so that they can find more information about it.
What scientists use to describe a constellation: C. It’s star pattern
A star is a giant astronomical or celestial object that comprises a luminous sphere of plasma and bounded together by its own gravitational force.
Generally, a star is typically made up of two (2) main hot gas and these are Hydrogen (H) and Helium (He). Some examples of a star are;
Antares. Canopus. Betelgeus. Sun (closest to planet Earth). Vega.A galaxy can be defined as a collection (group) of many billions of stars, which are existing independently. Thus, the greatest number of stars are found in a galaxy.
A constellation can be defined as a collection (group) of visible stars forming a recognizable or perceived pattern in the sky. Also, this pattern or outline is sometimes attributed by scientists to a mythological figure.
In conclusion, scientists use the pattern of a star to describe a constellation.
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Potassium and calcium are rarely found as pure elements in nature. They are usually combined with other substances. Explain why is this so.
Potassium and calcium are rarely found as pure elements in nature but are usually combined with other substances because of their high reactivity.
Reactivity of ElementsReactivity of elements refers to the ability of atoms of elements to gain or lose electrons in order to form bonds with other elements.
The most reactive elements are those of group 1, 2 and 7.
Group 1 elements are known as alkali metals and easily lose their one valence electrons to form ions.Because of their reactivity, they do not occur free in nature but in combined forma with other elements. Example is potassium.
Group 2 elements are known as the alkaline earth metals.They are very reactive as well and lose their two valence electrons easily to forms ions. Because of their reactivity, they do not occur free in nature but in combined forma with other elements. Example is calcium.
Therefore, potassium and calcium are rarely found as pure elements in nature but are usually combined with other substances because of their high reactivity.
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Hi Jose, when you submit this form, the owner will be able to see your name and email address.
1. A 100. g samle of water absorbs how many Joules of energy as its temperature is changed from
35.0 C to 60.0 C. (water s = 4.184 J/g C)
Answer:
10460J
Explanation:
Given parameters:
Mass of water sample = 100g
Initial temperature = 35°C
Final temperature = 60°C
Unknown:
Amount of energy absorbed by water = ?
Solution:
The amount of energy absorbed by water is mathematically expressed below;
H = m C ΔT
H is the amount of energy
m is the mass
C is the specific heat capacity of water = 4.184J/g°C
ΔT = 60°C - 35°C = 25°C
Now insert the parameters and solve;
H = 100 x 4.184 x 25 = 10460J
What is an inference?
A prediction of test results before an experiment
A retest of experimental results to make them reliable
Background research completed with questioning
A conclusion derived from evidence and logical reasoning
What is the atomic number of Sulfur atom
Answer:
16
Explanation:
hope you like the answer
Na2NO₃ → Na2 NO2 + O2
Answer:
4NO2 + 2Na2O + O2 → 4NaNO3
Use the drop-down menus to complete the sentences describing what happens when the temperature of a fluid increases. The kinetic energy of the molecules . The speed of the molecules . The density of the fluid . The fluid
Answer:
The kinetic energy of the molecules
increases
.
The speed of the molecules
increases
.
The density of the fluid
decreases
.
The fluid
rises
.
Explanation:
this is correct on edge
When the temperature of a fluid increases, then the kinetic energy of the molecules INCREASES, the speed of the molecules INCREASES, the density of the fluid DECREASES, and the fluid RISES.
Kinetic energy can be defined as motion energy, whereas potential energy is energy stored to be used when required.In a given object, as kinetic energy increases, the motion of the molecules also increases.An increase in kinetic energy (and temperature) in a fluid leads to the separation of its constituent particles, thereby decreasing the density.In conclusion, when the temperature of a fluid increases, then the kinetic energy of the molecules INCREASES, the speed of the molecules INCREASES, the density of the fluid DECREASES, and the fluid RISES.
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Look at the image.
What does this image represent?
a) hydroxyl group
b) ether group
c) carbonyl group
d) amine group
Answer:
a carbonyl group
Explanation:
Functional group can be interconverted into each there by the means of suitable reagent. Functional group are responsible for the chemical and physical properties of a compound. The correct option is option D that is amine group.
What is functional group?A group of atoms forming a component of a molecule that accounts for a particular function or chemical behavior is called a functional group. There are so many functional group in organic chemistry. Functional group determine the property of a compound.
The list of functional group are as follow:
Carboxylic group COOH
Alcoholic group OH
Ammine group R-NH₂
Ketonic group R-CO_R
Aldehydic group R-CHO
Thiol group R-S-H
Cyanide group -CN
The given image represent amine group.
Therefore the correct option is option D that is amine group.
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A __________ has distinct properties and composition that never vary.
A) solution
B) molecule
C) pure substance
D) heterogeneous mixture
Why can't we say that acids react with all metals to produce hydrogen ?
Answer:
The more reactive the metal, the more rapid the reaction is. A metal below hydrogen in the reactivity series will not react with dilute acids.
Explanation:
Answer:
Explanation:
Usually when an acid reacts with metal, salt and hydrogen are produced. Acid + metal = salt + hydrogen. Example calcium nitrate + hydrogen. Hope this helps
if motor bike travels 2.4 km in 5 min find it average velocity?
Answer:
28.8km/h
Explanation:
Change the 5min to hours.
=5/60 =0.0833hrs
Velocity= Distance /Time
2.4/0.0833
=28.8km/h
Which structures do plant cells have for making food that animal cells do not?
mitochondria
vacuoles
lysosomes
chloroplasts
Answer:
Answer
Explanation:
The chloroplast. Animal cells DO NOT make their own food, while chloroplasts are needed in the plant cell to carry out photosynthesis.
Answer:
A Mitochondria is the power house of the cell, So it's not A.
vacuole is the water storage, So it's not B.
the lysosomes remove Waste, Cellular Debris, and foreign particles, So it's not C.
It's D chloroplast create food for the cell .
(Hope this helps :) )
Explanation:
The model of the atom that pictured the atom with electrons randomly distributed throughout the positively charged mass was known as the
Answer:
The cannonball model
Explanation:
Hope this helped!! :)
at what points does the object accelerate please explain
Answer:
M=3
B=25
Equation= 3x+25
Explanation:
M is your slope and if you follow the slope- intercept formula (y=m+b) you just need to plug in the numbers.
Thus your answer:
M=3
B=25
Equation= 3x+25
What phase is Nitrogen at 80K
Answer:
i believe its gas sorry if i am wrong
Explanation:
what type of energy is released when electric charge moves between the clouds and ground
pls answer
What type of energy could be converted by using the stationary bikes? From ______ energy to _______ energy.
Answer:
Kinetic energy to Electrical energy.
Explanation:
When stationary bike is pedaled the wheels of the bike rotates which is a form of kinetic energy, this kinetic energy can be converted into electricity when connected to a generator.
From _Kinetic_ energy to _Electrical_ energy.
SOMEONE HELP ME PLEASE ILL GIVE BRAINLY
Vinegar and baking soda fizzing is a
Change in temperature
Formation of gas/bubbles
Formation of precipitate
Release of energy (fire/light)
Change in color
Answer:
When you combine the solid (baking soda) and the liquid (vinegar), the chemical reaction creates a gas called carbon dioxide. Carbon dioxide is invisible, except as the bubbles of gas you may have noticed when the vinegar and baking soda mixture began to fizz.
Explanation:
