How many grams of CaCl2 are need to prepare 250 mL of a 0.15M solution?
Answer:
Here is what I got from reading this question...
Explanation:
So if you dissolve 7.5625- g of CaCl2 in water, dissolve well and then add distilled in a 250- ml standard flask upto the mark and shake well for uniform Concentration, you will get 0.25- M CaCl2 solution.
Which type of bond shares the electrons between two elements?
Answer:
Covalent Bonds
General Formulas and Concepts:
Different types of bondsExplanation:
We have 3 types of bonds: Polar Covalent, Nonpolar Covalent, and Ionic bonds.
Nonpolar Covalent bonds share the electrons equally between the compound.
Polar Covalent bonds do NOT share the electrons equally, but STILL SHARE the electrons; the electron tends to stay with the element with the stronger electron affinity and thus creates dipoles.
Ionic bonds DO NOT share electrons. The electrons are transferred to the respective elements.
HELP PLEASE
all charged objects create an electric field around them. what two factors determine the strength of two electric fields upon the charged objects creating them?
1) how charged the object creating the field is and the density of the charged objects
2) how charged the object creating the field is and weather the objects are positively or negatively charged
3) how charged the object creating the field is and the mass of the two charged objects
4) how charged the object creating the field is and the distance between the two charged objects
Answer:
4) how charged the object creating the field is and the distance between the two charged objects
PLEASE I NEED HELP IN CHEMISTRY
Answer:
2. 232 & 86
Explanation:
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.
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:
What is the total amount of heat required to completely vaporize a 100.0 g of
water at its normal boiling point?
Work too pls !!
The total amount of heat : 225.704 kJ
Further explanationHeat of vaporization(ΔH vap) : heat needed to vaporize 1 mole of water , units : kJ/mol
For water at boiling point (100 °C) : ΔH vap = 40.66 kj/mol
mole of 100 g water :
[tex]\tt \dfrac{100}{18.015}=5.551[/tex]
so total Heat :
[tex]\tt 40.66\times 5.551=225.704~kJ[/tex]
A flask that weighs 450 g is filled with 145 ml of benzene. The weight of the flask and benzene is found to be 754 g. From this information, calculate the density of the benzene.
Answer:
Density, [tex]d=2.09\ g/cm^3[/tex]
Explanation:
Given that,
Mass of a flask is 450 g
Volume of benzene added to the flask is 145 mL or 145 cm³
The weight of the flask and benzene is found to be 754 g.
We need to find the density of the benzene.
Weight of benzene added = total weight of flask and benzene-mass of flask
m = 754 g - 450 g
m = 304 g
Density = mass/volume
So,
[tex]d=\dfrac{304\ g}{145\ cm^3}\\\\d=2.09\ g/cm^3[/tex]
So, the density of the benzene is [tex]2.09\ g/cm^3[/tex].
Susana heats up a sample of red crystals. While the sample is being heated,a gas is released and a blue powder is left after heating. Is the sample of red crystals an element or compound?
Answer & Explanation:
Susana's red crystal sample is a compound because it was broken down into a gas and blue powder. It is not an element because elements cannot be broken down into simpler substances by ordinary means, such as heating.
Answer:
Susana's red crystal sample is a compound because it was broken down into a gas and blue powder. It is not an element because elements cannot be broken down into simpler substances by ordinary means, such as heating.
Explanation
Sample response form Edg
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
According to Charles’ Law, if I __________ the Kelvin temperature, it will __________ the volume.
Answer:
increase is the answer for both ig?
I'm confused what valence electrons are ? idk if they're the same as just regular electrons
Answer: valence electrons are simply the electrons in the outer most ring of the chart. in your example, this atom has four valence electrons.
A student wants to make a fair comparison of the reactivity of the metals with
hydrochloric acid.
Name two variables that must be kept constant.
Answer:
the concentration of hydrochloric acid
the temperature in heating
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
During a chemical reaction, a new ___________ is formed. what is formed
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:
https://brainly.com/question/12744547
#SPJ2
What is the difference between the substances represented by the symbols Co and CO
Answer:
Be careful about when to use capital letters. For example, CO means a molecule of carbon monoxide but Co is the symbol for cobalt
Explanation:
Use the Lewis structure to predict the molecular geometry of each molecule.
CI - B - CI
1
СІ
tetrahedral
trigonal planar
trigonal pyramidal
Answer:
Trigonal planar
Explanation:
The geometry will be trigonal planar because B has 3 valence electron and all three each of it will form single bond with with electron of chlorine
The given compounds is boron trichloride BCl₃. The geometry of this molecule is trigonal planar. Thus option B is correct.
What is boron trichloride?Boron trichloride BCl₃ is a covalent compound formed by boron and three chlorine atoms.Boron is 5th element in periodic table and chlorine is 17th element.
Here, boron have 3 valence electron and Cl have 7 electrons in its valence shell. Boron shares its three valence electrons each to each chlorine. Industrially it is prepared by chlorinating carbon and boron oxide at higher temperature.
Trihalides of boron have a trigonal planar geometry because, each chlorine bond makes an angle of 120° with the boron atom. Thus it assumes the shape of a triangle with three chlorines in three corners.
Hence, the compound boron trichloride, BCl₃ have a geometry of trigonal planar and thus option B is correct.
To find more about BCl₃, refer the link below:
https://brainly.com/question/26634588
#SPJ2
During active transport, molecules move from areas of ______________ to _______________. This requires the use of _________.
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
can someone explain what a water table is ? :)
Answer:
It is where the water lies underground
Sonja and Jeremy performed several experiments to show how changes in temperature affected the volume of an inflated balloon. They made sure the pressure stayed the same. They also showed the effects of pressure on volume if temperature stayed the same. They organized their information in this table. Which experiments provide evidence for Boyle’s law?
Answer:
They also showed the effects of pressure on volume if temperature stayed the same
Explanation:
They also showed the effects of pressure on volume if temperature stayed the same is the experiment that will provide an evidence for Boyle's law.
Boyle's law states that "the volume of a fixed mass of a gas varies inversely as the pressure changes, if the temperature is constant".
The law is an affirmation of what happens when there is a dynamics between pressure and volume if temperature is made constant. So the experiment designed to investigate this proves and shows Boyle's law.write the number 3000,000,000 in scientific notation
Answer:
3 x 10^9
Explanation:
explain the economic features of gandaki province
Answer:
there are many valleys and mountain in this region
magar,gurung,brahmins are the main inhabitants of this province
there is possibility of tourism development in this province
production of apple in mountains and coffe in hilly has made this region popular .
Hope it helps
Answer:
There are many valleys and mountain in this region . Magar, Gurung, and Brahmins are the main inhabitants of this province . There is possibility of tourism development in this province . Production of apple in mountains and coffee in hilly has made this region popular.
Explanation:
May I have brainliest please? :)
Which of the following statements about biodiversity is true? a. Changes to biodiversity always positively affect an ecosystem. b. Changes to biodiversity always negatively affect an ecosystem. c. Changes to biodiversity can positively and negatively affect on an ecosystem. d. Changes to biodiversity never affect an ecosystem.
Answer:
I believe C
Explanation:
Saying it always does one thing or another is mostly not the case. When it comes to biodiversity, there can be positive impacts! But an ecosystem is affected by everything in it's biodiversity.
send help thank u asap
Answer:
The Answer is ________ Please Make sure You Put it In and Trust Have a wonderful day/Night:)
Explanation:
Answer:
3 is B 4 is the number 3
Explanation:
I hope this helps :D
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
predict the formula for a compound containing carbon (C) and chlorine (Cl)
Answer:
Carbon has a valency of+4 and chlorine has a valency equal to −1.Compound is Carbon tetrachloride CCl4.
Heeeelp,,, serious answers only pls i dont wanna hear about your love life
Thomson's plum pudding model of the atom was replaced by Rutherford's model. What was the biggest change Rutherford's model brought to our understanding of the atom? Group of answer choices
Answer:
This question is incomplete
Explanation:
This question is incomplete because of the absence of options. However, Rutherford's model of an atom highlighted the following (which you can use to determine your answer from the missing options)
1) electrons move in fixed circular part (now referred to as electron shells) around a central positively charged nucleus
2) The size of the nucleus is very small relative to the size of the atom
