Answer: C
Explanation: The atomic number is fixed by the number of protons. An element will have an exact number of protons. The neutrons can vary, and they are the reason elements have isotopes (all the same number of protons, but some have differing numbers of neutrons). Electrons are too small to be counted in the atomic weight figures.
HELP! Fill in the blanks:
The net charge of an atom is equal to the difference between the_____
in the atom's nucleus and the_____
Answer:
I don't know
Explanation:
is today your test
What can we say about
protons?
A. They are in the nucleus and never
leave.
B. They move around outside the nucleus.
C. They move in and out of the nucleus.
Answer:
A. They are in the nucleus and never leave.
Explanation:
Protons as well as neutrons are located in the nucleus of the atom.
hope this helps!
To express very large or very small numbers, scientists use what
write the chemical formula for the following compound -magnesium chloride, zinc sulphide Sodium,sodium sulphate, calcium bicarbonate.
Answer:
magnesium chloride: MgCl2
zinc sulphide: ZnS
sodium sulphate: Na2SO4
calcium bicarbonate: Ca(HCO3)2
Can someone please help me with this
Answer:
Explanation:
cant see the screen really
Arrange the elements in order of increasing ionization energy. chlorine, fluorine, gallium, phosphorus
Answer: Ga, P,Cl, F
Explanation:
Cl 1314 kJ/mole
F 1681 kJ/mole
Ga 579 kJ/mole
P 1012 kJ/mole
what is the hydrogen ion concentration of oven cleaner?
Answer:
Bases are substances that dissolve in water to release hydroxide ions ... Chalk and oven cleaner are examples of familiar products that contain bases
matter is not created or destroyed in any chemical or physical
a. law of conservation of mass
b. chemical change
c. physical change
d. wood
Answer:
a
Explanation:
everything can be broken down to a smaller less useful compounds but never destroyed
Which type of bond and how many bonds would occur as carbon dioxide (CO2) is formed from carbon in Group IVA and oxygen in Group VIA?
three metallic bonds
two ionic bonds
four covalent bonds
one covalent bond
Four covalent bonds are formed as carbon dioxide (CO2) is formed from carbon in Group IVA and oxygen in Group VIA.
The periodic table is composed of eighteen groups and eight periods. The common thread that holds all the elements in a group is that they all have the same number of valence electrons in their atoms. The elements in the same period all have the same highest energy level.
Oxygen in group Group VIA has six valence electrons while carbon in group Group IVA has four valence electrons. Hence, the chemical bond in carbon dioxide CO2 must contain four covalent bonds as shown in the image attached to this answer.
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Answer:
Four Covalent bonds
Explanation:
The formula F= 9/5C + 32
changes a temperature reading from the Celsius scale C to the Fahrenheit scale F. What is the temperature measured in degrees Fahrenheit when the Celsius temperature is 10 (DEGREES) C?
Answer:
yes it is c=mxb okay
Explanation:
An element cannot ________. a be part of a homogeneous mixture b be a pure substance c interact with other elements to form compounds d be part of a heterogeneous mixture e be separated into other substances by chemical means
Answer:
b be a pure substance
Explanation:
Explain the geometry of PCl5 molecule and account for its high reactivity
Answer:
In PCl5, in addition to equitorial bonds which lie in the same plane ,there are axial bonds. Since it suffers more repulsion it is longer than the other bonds. Also these are weak bondsand therefore these bonds can break easily . Because of these reasons,PCl5 is very reactive.
necesito ayuda con esto y si es necesario con procedimientos, gracias
Answer:
sorry but I don't understand Spanish
otherwise I will definitely helps you
I don't understand Spanish but you can do this :)
An _____
is an explanation of data that is based on facts
Answer:
Theory.
Explanation:
It is called a theory.
will mark brainliest if correct
Which methods separate a mixture according to the size of the particles?
a
filtration and chromatography
b
distillation and chromatography
c
filtration and evaporation
d
distillation and evaporation
Answer:
filtration and chromatography
Explanation:
I hope this will help you :-)
The slope of the line represents a quantity called density. If rise represents the y-axis and run
represents the x-axis, what is the formula for density?
Answer:
Density equals Mass over Volume
Explanation:
D=m/v
Which of the following statements is not true about ecosystems?
a. A healthy ecosystem can support an unlimited number of life forms.
b. Predators play a role in balancing the earth's ecosystems.
c. People's activities can improve the health of an ecosystem.
d. The parts of an ecosystem depend on each other.
Answer:
A
Explanation:
though an ecosystem can support life forms,when they become over populated or unlimited there will be competition for food,Shelta and other basic necessities which will lead to many of these life forms dying
Tell electronic configuration of Copper?
Answer:
1s22s22p63s23p64s23d9
Explanatihe neutrlon:
Tell electronic configuration of Copper?
Copper is atomic # 29 so it has 29 protons.
The neutralatom must have 29 negative charges to balance the 29
positive charges, so it has 29 electrons.
Our electron configuration must account for all 29 electrons
Look at a Periodic Table
cture from
find copper #29
let us "AUF-BAU" ( buld up) the copper electronic configuration from the Periodic Table.copper #29 is in th 4th row.
To "build up", start at row 1. this is the 1st energy level. there are noly 2 elements H and He, so it is only an "s" robital. with 2 e's. so
1s2ve 2 e's in an s orbital and 6 in p orbitals,
at row 2 (energy level 2) we have 2 e's in an s orbital and 6 in p orbitals, so
building on top of row 1, we have
1s22s22p6
at row 3 we repeat and so have
1s22s22p63s23p6
at row 4 we start with 2 e in an s orbital at the 4th energy level, so we
have
1s22s22p63s23p64s2
we now enter the d orbtals, and copper has 9 electrons in the d orbitals.
but these d orbitals are only slightly at energy level 4. because of their more complex shape, most of the orbital is in the 3rd energy level, so
we buld up for copper, #29
1s22s22p63s23p64s23d9
count the electrons and add them:
2 + 2 +6 +2 +6 +2 +9 = 29 copper's number
Which type of bond and how many bonds would occur as carbon dioxide (CO2) is formed from carbon in Group IVA and oxygen in Group VIA?(1 point)
three metallic bonds
two ionic bonds
four covalent bonds
one covalent bond
Answer:
four covalent bonds
Explanation:
Answer: four covalent bonds
Explanation:
summarize why error is important.
4.4 x 10^-9
What’s this in standard form or scientific notation
Answer:
How to Convert a Number to Standard Form
Move the decimal point in your number until there is only one non-zero digit to the left of the decimal point. ...
Count how many places you moved the decimal point. ...
Write your scientific notation number as a x 10b and read it as "a times 10 to the power of b."
Explanation:
600mL of a gas at 27◦C and 1atm pressure is heated to 177◦C. What pressure Must be applied to the gas in order to maintain the same volume?
Answer:
gkfbhs DC hdshgagfzh
What net force is required to acceleterate car at a rate of 2 m/s² if the car has a mass of 3,000 kg
Answer:
6000N
Explanation:
Force = Mass x Acceleration
= 3000 x 2
= 6000 kg m/s^2 or 6000N
Answer:
[tex]\boxed {\boxed {\sf 6000 \ Newtons}}[/tex]
Explanation:
We are asked to calculate a net force. According to Newton's Second Law of Motion, force is the product of mass and acceleration.
[tex]F= m \times a[/tex]
The mass of the car is 3,000 kilograms and the acceleration is 2 meters per second squared.
m= 3000 kg a= 2 m/s²Substitute the values into the formula.
[tex]F= 3000 \ kg * 2 \ m/s^2[/tex]
Multiply.
[tex]F= 6000 \ kg * m/s^2[/tex]
Convert the units. 1 kilogram meter per second squared is equal to 1 Newton. Our answer of 6000 kilogram meters per second squared is equal to 6000 Newtons.
[tex]F= 6000 \ N[/tex]
The net force required to accelerate a 3,000 kilogram car at 2 meters per second squared is 6000 Newtons.
A dehydration reaction (or condensation reaction) is the process in which _____. See Concept 5.1 (Page) View Available Hint(s)for Part A water molecules are produced as a polymer is formed from monomers the bonds between the individual monomers of a polymer are broken by the addition of water molecules water molecules are attracted to each other water molecules are used as a source of raw material to break down polymers to monomers None of the choices is correct.
A dehydration reaction (or condensation reaction) is the process in which water molecules are produced as a polymer is formed from monomers.
A chemical reaction is the process by which substances called reactants are transformed to another substance known as products through the breaking up or building up of bonds between the reactants.
There are different types of chemicals reaction which includes condensation reaction.
Condensation reaction involves the combination of two smaller molecules known as monomers to for one larger molecule known as polymer with the loss of water molecule.
Condensation reaction is specifically called dehydration reaction due to the loss of water molecule that is involved.
Therefore, a dehydration reaction (or condensation reaction) is the process in which water molecules are produced as a polymer is formed from monomers.
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what is the density of a rock with a volume of 5 mL and a mass of 13.5
0.37 g/mL
67.5 g/mL
2.7 g/mL
13.5 g/mL
Answer:
Density is 2.7 g/ml³
Explanation:
[tex]density = \frac{mass}{volume} \\ [/tex]
mass » 13.5 g
volume » 5 ml³
[tex]density = \frac{13.5}{5} \\ \\ = 2.7 \: {g \: ml}^{ - 3} [/tex]
Answer:
[tex]\boxed {\boxed {\sf 2.7 \ g/mL}}[/tex]
Explanation:
Density is a substance's mass per unit volume. The formula for calculating density is as follows.
[tex]\rho= \frac{m}{v}[/tex]
The mass of the rock is 13.5 grams and the volume of the rock is 5 milliliters.
m= 13.5 g v= 5 mLSubstitute these values into the formula.
[tex]\rho= \frac{13.5 \ g}{5 \ mL}[/tex]
Divide.
[tex]\rho= 2.7 \ g/mL[/tex]
The density of the rock is 2.7 grams per milliliter.
The jewelers' mass unit for diamond is the
carat. By definition, 1 carat equals ex-
actly 200 mg.
What is the volume of a
1.07 carat diamond? The density of diamond
is 3.51 g/cm
Answer in units of cm".
Answer:
0.75 cm
Explanation:
You will convert 1.07 carat into mg then into g. You will multiply its reciprocal by 3.51g/cm to get the answer.
Calculate the no. of moles in 25gm of calcium phosphate
PLz Fast
answer/
1 grams Calcium Phosphate to mol = 0.00322 mol
no. of moles= 0.00322×25
no. of moles = 0.0805
what will happen to the atoms or sbstance when it is condenses
Answer:
Hey mate.....
Explanation:
This is ur answer.....
Condensation happens when molecules in a gas cool down. As the molecules lose heat, they lose energy and slow down. They move closer to other gas molecules. Finally these molecules collect together to form a liquid.
Hope it helps!
Brainliest pls!
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What is a net ionic equation?
Answer :
a chemical equation in
which the electrolytes in aqueous
solution are expressed as dissociated
ions.
Have good day !!
WILL MARK BRAINLIEST
Removing the pulp (solid) from the orange juice using a juice strainer.
a chemical change
b Physical change
Taking into account the definition of physical change and chemical change, the correct option is option b. removing the pulp (solid) from the orange juice using a juice strainer is a physical change.
Two types of changes can be distinguished: physical changes and chemical changes.
A physical change is a change that makes something different without changing the composition of the material.
In other word, a physical change is a transformation in which the nature (composition) of matter does not change, so that the substances involved are the same before and after the change.
On the other hand, chemical changes are considered to be those in which the substances involved are transformed into totally different ones.
In other words, chemical changes refer to the process that involves one or more substances that become new substances with different nature and properties.
In this case, removing the pulp (solid) from the orange juice using a juice strainer is a physical change because the pulp and the orange juice are the same before and after the change and their properties do not change.
In summary, the correct option is option b. a physical change.
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