Answer:
It s a pure substance.
Explanation:
Can only be separated into its different elements by chemical means because it is connected by a chemical bond.
Which of the following is the equation for wave speed?
Answer:
[tex]{ \boxed{ \mathfrak{ \: answer : \: { \bf{v = f \lambda}} }}}[/tex]
v is the wave speedf is frequencylambda is wave length
You have been given four substances that are all white
solids at room temperature. List three specific tests that
you could perform to figure out whether they are ionic or
molecular compounds.
Ionic compounds have a high melting point while molecular compounds have a low melting point.
If I have a white solid, this solid may be ionic or molecular. Ionic substances dissolve in water while molecular substances do not dissolve in water. This is the first test.
Secondly, an ionic solid has a high melting point while a molecular solid has a low melting point. Again, ionic substances are crystalline when felt while molecular compounds are non crystalline when felt.
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Copernicus believed the planetary motions were due to:
Answer:circular heliocentric orbits.
Explanation:
plesse hurry aand help with QQQQQ
Answer: the answer should be A the first one
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What is considered a pure substance?
Answer:
A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen. A pure substance does not have to be of a single element or compound.
Explanation:
Compound: A substance that contains more than one element
pure substance: is made up of one substance made up of only one type of molecule
The force on an object is given by the equation F= ma. In this equation, Fis
the force, mis the mass, and a is the acceleration. What is the force on an
object that has a mass of 540 kg and an acceleration of 2.3 m/s2?
Answer:
[tex]\boxed {\boxed {\sf 1, 242 \ N}}[/tex]
Explanation:
According to Newton's Second Law of Motion, force is the product of mass and acceleration.
[tex]F=ma[/tex]
In this formula, F is the force, m is the mass, and a is the acceleration.
The mass of the object is 540 kilograms and the acceleration is 2.3 meters per second squared.
m= 540 kg a= 2.3 m/s²Substitute the values into the formula.
[tex]F=(540 \ kg)(2.3 \ m/s^2)[/tex]
Multiply.
[tex]F=1242 \ kg*m/s^2[/tex]
Conver the units. 1 kilogram meter per second squared is equal to 1 Newton. Therefore, our answer of 1242 kilogram meters per second square is equal to 1242 Newtons.
[tex]F= 1242 \ N[/tex]
The force of the object is 1242 Newtons.
Which description is an example of the effects of rising temperatures?
A student compares a sample of isooctane with some petrol. the student found that the isooctane boiled at 99°C while the petrol boiled between 45 and 95°C. which of these is a puse Substance? Explain ur answer.
Answer:
The isooctane
Explanation:
A pure substance is, according to Wikipedia, "a chemical substance is a form of matter having constant chemical composition and characteristic properties." That's a lot of words, but we just need to focus on some of them: "constant... characteristic properties." The properties of a pure substance always stay the same, no matter what.
The boiling point of a substance is one of its properties. It looks like the petrol boils at different points, between 45 and 95°C. The isooctane, on the other hand, boils consistently at 99°C. So, we can infer that the isooctane is the pure substance.
Hopefully that was helpful! If you need more questions answered, let me know. :)
A chemist measured the temperature of a liquid to be 26 ∘C, then she heated the liquid to 83 ∘C. By how many Kelvins did the temperature change.
Answer: 57.C
Explanation: simple subtraction
Explain why the number 1,085 is NOT a perfect square
1085 is a perfect square if the square root of 1085 equals a whole number. The square root of 1085 is not a whole number. 1085 is not a perfect square root.
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An atom's Lewis dot structure has three dots. Which of the following elements could it be, and why? (4 points)
Group of answer choices
Aluminum, because it is in group 13 and has three valence electrons.
Lithium, because it is a group 1 element with three total electrons.
Magnesium, because it is in period 3 and has three valence electrons.
Potassium, because it is an alkali metal and has three inner shell electrons.
Answer : The correct option is, Magnesium because it is a group 2 element with two valence electrons.
Explanation :
Element = Calcium
Atomic number = 20
Electronic configuration of Ca =
Number of valence electrons in Ca = 2
The number of inner shell electrons in Ca = 18
This option is wrong because lewis-dot structure shows only valence electrons not inner shell electrons.
Element = Carbon
Atomic number = 6
Electronic configuration of C =
Number of valence electrons in C = 4
This option is wrong because only outermost p-sublevel electrons are not showing in lewis-dot structure.
Element = Lithium
Atomic number = 3
Electronic configuration of Li =
Number of valence electrons in Li = 1
This option is wrong because it has only 1 electron in outermost shell.
Element = Magnesium
Atomic number = 12
Electronic configuration of Ma =
Number of valence electrons in Ma = 3
This option is correct.
Lewis-dot structure : It is defined as the structure in which valence electrons of the atom is shown as dots.
ANOTHER EXPLANATION:
Answer: C. Magnesium, because it is a group 2 element with two valence electrons.
An atom's Lewis dot structure has two dots. Which of the following elements could it be, and why?
A. Calcium, because it is an alkaline earth metal with two inner shell electrons.
B. Carbon, because it has two electrons in its outermost p sublevel.
C. Lithium, because it is a group 1 element with two bonding electrons.
D. Magnesium, because it is a group 2 element with two valence electrons.
Explanation:
If you were to look at the periodic table magnesium would be in group 2. Since magnesium is in group 2 therefore it will have two valence electrons. Calcium is another possible answer because it is also in group two, but for this quiz it is incorrect. Lithium is incorrect because it is in group 1 and therefore it would only have 1 valence electron. Carbon is also incorrect because it is in group 14 so it would have 4 valence electrons. Hope this helps and makes sense.
Good Luck!!
Have a great day Studying!
The Lewis dot structure of an atom has three dots. With three valence electrons and belonging to group 13, which of the following elements may it be?
Are the elements of group 13 metals?The semi-metal boron (B) and the metals aluminum (Al), gallium (Ga), indium (In), and thallium (In) are all members of the boron family (Tl). The periodic table's fifth element, boron (Z=5), is found in Group 13. It is categorized as a metalloid because of its characteristics, which combine those of metals and nonmetals.
What traits does group 13 exhibit?The Periodic Table of Elements places these elements in Group 13 (XIII) of the p block. Metallic elements include thallium, gallium, indium, and aluminum. In their outermost shells, they each have three electrons shell with the valence electron configuration ns2np1 (one electron in the p orbital and a complete s orbital).
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.
Which has the greatest electronegativity?
need help w this question
Answer:
ok you got it you just need to add.
Explanation:
add 5 times and she what you get.
What’s solubility need it for science
Answer:
the ability of a compound to dissolve
Explanation:
salt dissolves in water so it would be soluble.
oil does not dissolve in water so it is not soluble
Element X is in group 2, and element Y is in group 7, of the periodic table. which ions will be present in the compound formed when X and Y react together?
A) X^+ and Y^-
B)X^2+ and Y^-
C)X^+ and Y^2-
D)X^2- and Y^+
Answer:
Element X has valency 2 while Y Valency 2, element Y has high tendency of gaining electrons for its stability thus the compound formed will be B
elements X is positively charged while Y will be negatively charged
The groups or the families in the periodic table are denoted by the vertical column. Element in group 2 and 7 forms compound with ions X²⁺ and Y⁻. Thus, option B is correct.
What is the periodic group?A group of the periodic table is also called a family that has the elements placed togther with the same number of the valence electron. Group II has two valence electrons and VII has seven valence electrons in the outer shells.
The two valence electrons of the atom can be donated easily compared to acquiring the six electrons to complete the octet and stability. Similarly, the seven valence electrons are hard to donate but can accept one electron to achieve satbility.
The group II element X will donate its two electrons to acquire a +2 charge, whereas group VII element Y will accept one electron and acquire a -1 charge.
Therefore, option B. X²⁺ and Y⁻ presents the ions of the compound.
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What do you think are the unique characteristics of the Earth that allow the existence of life?
Answer: Oxygen, Water and Trees
Explanation: No other planet in the solar system has an atmosphere of oxygen or liquid water or trees on them.
NEED HELP!PLEAE WITH CHEMISTRY!
3. both covalent and ionic
EXPLANATION
Sodium Phosphate is an ionic compound formed by two ions, Sodium Na+ and Phosphate PO−3 . In order for these two polyatomic ions to bond the charges must be equal and opposite. Therefore, it will take three +1 sodium ions to balance the one -3 phosphate ion. However, polyatomic ions are held together by covalent bonds, so this compound contains both ionic and covalent bonds.
Can someone help with this pls!!
Answer:
2
Explanation:
good vibes
During region C of the graph above the energy being absorbed is a. increasing the velocity of the water particles. b. increasing the distance between the water particles and reducing their phase energy. c. increasing the distance between the water particles and increasing their phase energy. d. decreasing the velocity of the water particles.
Answer:
Your answer would be B. Increasing the distance between the water molecules and increasing their phase energy.
Explanation:
Hope this helps you answer this question!
Put the sets of 3 elements in order from least metallic character to most metallic character. Help please!!
Answer:
29:Mn,V,Sr
30:Ni,Pd,Cs
31:Cr, Mo, W
32:Sn,Pb,Ti
33:F, P, As
Sorry I was in a rush so it may not be right; so check with this picture to help you out.
Which one of the following is an example of extensive
property?
a Hardiness
be Density
a Meliting point
d. Electrical resistance
Clear my choice
Answer:c
Explanation:
Answer:
mass an volume or hardines be density
How does the concentration of ions in a strong acid differ from a weak acid?
Answer:
A strong base has a much smaller concentration of positive ions (hydrogen ions) and a much greater concentration of negative ions (hydroxide ions). The weak base has a much greater concentration of positive ions (hydrogen ions) and a much smaller concentration of negative ions ( hydroxide ions) = answer !!
Explanation:
What do all the molecules in the table have in common?
Answer:
They all consist of the same amount of protons, electrons, and neutrons in an element.
Explanation:
For example in water (H20) contains 1 atom of protons, 1 atom of electrons and 1 atom of neutrons.
what happens to the atoms during a chemical reaction
Answer:
Atoms get rearranged and make up different molecules. No atoms are created nor destroyed.
Explanation:
determine whether each phrase describes starch, glycogen, or cellulose.
Answer:
Starch is a soft, white, tasteless powder that is insoluble in cold water, alcohol, or other solvents.
glycogen is a substance deposited in bodily tissues as a store of carbohydrates. It is a polysaccharide which forms glucose on hydrolysis.
Cellulose is a molecule, consisting of hundreds and sometimes even thousands of carbon, hydrogen and oxygen atoms.
4. What is a common cause of acid rain?
Answer:
Exhaust from cars, trucks, and buses releases nitrogen oxides and sulfur dioxide into the air. These can cause acid rain.
Hope this helps! :)
Formula for Gold (I) Nitride
Answer:
Gold(I) Nitride Au3N Molecular Weight -- EndMemo
A gas has a pressure of 1.51 atm and occupies a volume of 8 L. If the gas is compressed to a volume of 1.12 L, what will its pressure be, assuming constant temperature? Answer in units of atm.
Answer:
[tex]\boxed {\boxed {\sf 10.8 \ atm}}[/tex]
Explanation:
We are asked to find the new pressure of a gas after a change in volume. Since the temperature remains constant, we are only concerned with pressure and volume.
We will use Boyle's Law, which states that the volume and pressure of a gas are inversely proportional. The formula for this law is:
[tex]P_1V_1=P_2V_2[/tex]
The gas has an original pressure of 1.51 atmospheres and a volume of 8 liters.
[tex](1.51 \ atm)(8 \ L)=P_2V_2[/tex]
The volume is compressed to 1.12 liters and the new pressure is unknown.
[tex](1.51 \ atm)(8 \ L)=P_2 (1.12 \ L)[/tex]
We are solving for the new pressure, so we must isolate the variable [tex]P_2[/tex]. It is being multiplied by 1.12 liters. The inverse operation of multiplication is division. Divide both sides of the equation by 1.12 L.
[tex]\frac {(1.51 \ atm)(8 \ L)}{1.12 \ L}= \frac{P_2(1.12 \ L)}{1.12 \ L}[/tex]
[tex]\frac {(1.51 \ atm)(8 \ L)}{1.12 \ L}= P_2[/tex]
The units of liters (L) cancel.
[tex]\frac {(1.51 \ atm)(8 )}{1.12}= P_2[/tex]
Multiply the numerator.
[tex]\frac {12.08 \ atm}{1.12}= P_2[/tex]
[tex]10.7857143 \ atm = P_2[/tex]
Round to the nearest tenth. The 8 in the hundredth place tells us to round the 7 in the tenth place up to an 8.
[tex]10.8 \ atm \approx P_2[/tex]
The new pressure after the volume is compressed is approximately 10.8 atmospheres.
Can someone give me Two methods for monitoring and minimizing a human impact on the environment?
After reading the passage, choose the statement that corrects the error()
Solids, such as an orange, take up less space than a watermelon When an orange or watermelon is moved and put into a container, the volume does not change. A liquid, such as
orange juice or water, will change shape when it is poured into a different container, but the volume stays the same Gases, such as helium, take the volume of the container they are in
The volume of hellum in a balloon will stay the same when the gas is released from the balloon
o When an orange or watermelon is moved and put into a container, the volume changes,
O Gases, such as helium, do not take the volume of the container they are in
o The volume of helium in a balloon will change when the gas is released from the balloon
A liquid, such as orange juice or water, will not change shape when it is poured into a different-shaped container
Answer:
B or C
Explanation:
because i think that watermelon's change volume in a different container
