Answer:
The number of neutrons is variable, resulting in isotopes, which are different forms of the same atom that vary only in the number of neutrons they possess. Together, the number of protons and the number of neutrons determine an element's mass number.
Which of the following molecules has a central atom with precisely two unshared
pairs of electrons?
Identify two reasons why the relative size of an atom become smaller due to the loss of electrons .
Answer:
nucleus as electrons are being added to the same principal energy level. These electrons are gradually pulled closer to the nucleus because of its increased positive charge. Since the force of attraction between nuclei and electrons increases, the size of the atoms decreases.
Explanation:
Nuclear attractive pull to the electrons results in smaller atomic radius. Two reasons that leads the size of an atom smaller by electron loss are nuclear pulling and emptying outermost orbital.
Why atomic radius reduces by electron loss?
The nucleus have a net positive charge and electrons are negative in charge, thus, each electron experience a nuclear attractive pull. However, each electrons are shielded slightly from this attraction by the surrounding electrons.
The reasons which make the atomic radius smaller are the following.
By losing electrons the total number of electron is reducing therefore, the screening or shielding of an electron by other electron from the nuclear attractive pulling reduces, and thus due to the nuclear attraction, the orbitals shrinks inwards and reduces the atomic size. By losing electron from the outermost orbital if it contains only one electron then the orbital becomes empty and the atomic radius shrinks to the penultimate shell or orbital.
Therefore, due the two reasons mentioned above, the atomic radius reduces by electron loss.
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Need help. Is this correct
Answer:
Yes, that is correct!
Explanation:
Answer:
Yes
Explanation:
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.
The main product of the photosynthesis reaction is
OA.
protein.
OB.
sugar.
Oc.
fat.
OD.
DNA.
Answer: Sugar
Explanation: Because after photosynthesis (Carbon dioxide, water, and sunlight) react, they make two products. Glucose (A sugar) and Oxygen.
To make a balanced equation, 6 H2O + 6 CO2 ---> C6H12O6 + _
Answer:
6O₂
General Formulas and Concepts:
Chemistry/Biology
Photosynthesis Equation: 6H₂O + 6CO₂ → C₆H₁₂O₆ + 6O₂Explanation:
Most of the equation comes from the Photosynthesis Equation. Plants take in water and carbon dioxide and sunlight (energy) to produce glucose and oxygen. When we balance the equation and predict reaction. we should get 6O₂ as our answer.
I NEED HELP RN 40 POINTS
Answer:
B.) Adding a source of carbon dioxide to the water.
Explanation:
I had that question too.
NEED HELP PLSSSS THANK UU
Answer: rotation
Explanation:
orbitttttttttttt
Explanation:
What is the density of a block with a volume of 5 cm3 and a mass of 20 g?
Answer: 4g/cm^3 or 4000g/L (4kg/L)
Explanation:
I'm not sure what units the question intended so I put both. For the first one, the equation for density is mass/volume so I divided the 20g by 5cm^3 to get 4g/cm^3. Just in case those aren't the intended units for volume and is instead liters, one cm^3 equals one ml. In addition, there are 1000ml in every liter so you can determine the amount per liter by multiplying 4g/ml by 1000 to get 4000g/L or 4kg/L.
I hope this helps.
How many kilograms is 0.22 lb?
O A. 0.22 kg
O B. 0.454 kg
C. 0.0998 kg
O D. 0.49 kg
Answer:
C)0.0998kg
explanation:
1 POUND=0.453592...kg
convert 80kg into grams
Answer:
80000 grams
Explanation:
kilo means 1000
80 x 1000 = 80, 000
what volume of water has a mass of 1 kg
Answer:
[tex]V=0.001\ m^3[/tex]
Explanation:
Mass, m = 1 kg
The density of water, d = 1000 kg/m³
We need to find the volume of water. The formula for the density of an object is equal to mass divided by volume. Its formula is :
d = m/V
V is the volume of water
[tex]V=\dfrac{m}{d}\\\\V=\dfrac{1\ kg}{1000\ kg/m^3}\\\\=0.001\ m^3[/tex]
So, the volume of water is [tex]0.001\ m^3[/tex].
Answer:
Volume of water has a mass of 1 kg is explained below in details.
Explanation:
One liter of h2O has a volume of approximately specifically one kilogram when estimated at its maximum frequency, which happens at about 4 °C. It observes, therefore, that thousand of a liter, recognized as one milliliter (1 mL), of h2O has a volume of about 1 g; 1000 liters of h2O has a volume of about 1000 kg (1 tonne).
Which of these common substances is a mixture?
A Sulfur
B Pure Water
C Spagettios
D Nitrogen
Answer:
D
Explanation:
A is a compound
B is purified water
C is a substance made by two substances
Hope this helps
51 liters of helium and 29 liters of oxygen (O2), both at 35°C and 1.0
atmosphere, are pumped into a tank that has a volume of 5 liters. Calculate the number
of moles of each component and the total pressure in the tank at 35°C
Answer:
If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, ... If I contain 3.0 moles of gas in a container with a volume of 60. liters and at a ... Mixtures of helium and oxygen are used in scuba diving tanks to help prevent ... volume of 5.00 Lat 25.0C. Calculate the partial pressure of each gas and the ...
Explanation:
True testing means that a serious effort is made to _________.
Question 8 options:
be absolutely positively, without a shadow of a doubt, correct.
create experiments that support your hypothesis
falsify (“disprove”) each possible explanation.
complete testing that supports manufacturers claims, so you can cash in and make money.
Explanation:
This explanation is the opposite of true testing - a term known as falsifiability. Falsifiability, when it relates to science, refers to how it should be possible to prove a hypothesis or theory wrong. Thus, the point of testing for falsifiability is to test in which condition is the theory wrong.
A term that might relate to the phrase ‘true testing’ used in the question would be testability. Which refers to the practice of testing a hypothesis or theory to see whether it is true or false.
True testing has been the scientific method that uses various steps to conclude the findings. "True testing means that a serious effort is made to create experiments that support your hypothesis." Thus, option B is correct.
What is True testing?True testing has been defined as the assessment scientific method that is involved in solving the question and issue by formulating the hypothesis and then researching the possible observations and solution that concludes and proves the findings.
It falsifies or proves the hypotheses right or wrong based on the experimental design setup. It does not falsify each possible explanation, nor is always fully correct. It also is not conducted to support the manufacturing and support it financially.
Therefore, option B. True testing experiments to sustain the hypothesis.
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CaO + H2O -> Ca(OH)2
3.50g of Ca(OH)2 was made from 4.20g of CaO? What is the % yield of Ca(OH)2?
The % yield of Ca(OH)₂ : 62.98%
Further eplanationPercent yield is the compare of the amount of product obtained from a reaction with the amount you calculated
General formula:
Percent yield = (Actual yield / theoretical yield )x 100%
An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients
Reaction
CaO + H₂O ⇒ Ca(OH)₂
mass CaO= 4.2 g
mol CaO(MW=56,0774 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{4.2}{56,0774 g/mol}\\\\mol=0.075[/tex]
mol Ca(OH)₂ based on mol CaO
mol ratio CaO : Ca(OH)₂,= 1 : 1, so mol Ca(OH)₂ = 0.075
mass Ca(OH)₂(MW=74,093 g/mol) ⇒ theoretical
[tex]\tt mass=mol\times MW\\\\mass=0.075\times 74,093 g/mol\\\\mass=5.557~g[/tex]
% yield :
[tex]\tt =\dfrac{actual}{theoretical}\times 100\%\\\\=\dfrac{3.5}{5.557}\times 100\%\\\\=62.98\%[/tex]
Mass Number
19
Atomic Number
Elements
Fluorine
Neon
Aluminium
Phosphorus
10
13
15
a. i. Which of the elements would not be capable of forming compounds
Answer:
Explanation:
The atomic number is the number of protons inside the nucleus of an atom. ... 1.1% carbon 13 with 7 neutrons and a mass of 13.00335 u (measured), and a ... The value given is the mass number of the most stable isotope of that element. ... That's because the chemistry of helium is more like neon (Ne), argon (Ar), etc.
whats the diffrence beetween fluids and nonfluids
Answer:
One is a fluid and one is not.
Explanation:
Fluid is a common state of certain substances, or a type of matter. Liquid is one of the three phases or state of matter. Fluids flow and has some viscosity (thickness). Liquids also flows and it has volume, but no definite shape. A non fluid is a substance that is not a liquid.
Answer:
one is limited and one isn't
The solids and liquids with the strongest intermolecular forces of attraction will have the
lowest melting and boiling points.
a. TRUE
b. FALSE
any help would be much appreciated, i'm being timed :( i'll mark brainliest and 5 star
Answer:
3 times ....
group 2
Explanation:
Which of the following best represents and explains the formula for a compound made from fluorine and hydrogen?
A. HF, because both fluorine and hydrogen are capable of forming only one ionic bond.
B. HF, because both fluorine and hydrogen are capable of forming only one covalent bond.
C. H2F, because fluorine is short of two electrons, and hydrogen is short of one electron.
D. H2F, because fluorine is capable of forming one, and hydrogen is capable of forming two covalent bonds.
Thank you
The answer is B
HF, because both fluorine and hydrogen are capable of forming only one covalent bond.
The formula for a compound made from fluorine and hydrogen is HF, because both fluorine and hydrogen are capable of forming only one covalent bond. The correct option is option B.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion. Covalent bond is weaker than ionic bond.
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron.
The formula for a compound made from fluorine and hydrogen is HF, because both fluorine and hydrogen are capable of forming only one covalent bond.
Therefore, the correct option is option B.
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Please help
As the temperature increases, the molecular motion of the molecules decreases and it
becomes difficult to overcome the polar attractions.
a. TRUE
b. FALSE
She remembered that chemical equations can summarize what happens in a chemical reaction. What is the name of the two parts found on the left side of the equation below? 4 Fe + 3O2 → 2Fe2O3 A. products B. reactants C. scientific notation D. synthesis
Answer:
The name of the two parts found on the left side of the equation is reactants.
Explanation:
Chemical reaction is the way one substance reacts against another. That is, a chemical reaction is that chemical process in which two or more substances, by the action of an energy factor, are converted into other substances. The new substance (s) that are formed usually present a totally different appearance from that of the starting substances.
In a chemical reaction there are the substances that react, that is, the reactants, and the substances produced, called products.
A chemical reaction is represented by a chemical equation. The formulas of the reactants are written on the left, and those of the products on the right, both separated by an arrow indicating the direction of the reaction.
Reactants ⇒ Products
Then, the name of the two parts found on the left side of the equation is reactants.
9.25x10^-8 x6.40x10^3 in scientific equation
Answer:
5.92E-4 or 5.92x10^-4
Explanation:
What effects do winds patterns have on climate
Prevailing winds bring air from one type of climate to another. For example, warm winds that travel over water tend to collect moisture as they travel; the water vapor in the air will condense as it moves into colder climates, which is why temperate coastal areas often receive heavy rainfall.
Hope it Helps! T^T
Which of the diagrams below shows an atom that is not a form of hydrogen?
Answer:
I believe is the npp i kinda forgot how to do these lol
Diagram with npp type shows an atom that is not a form of hydrogen.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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What type of plate boundary forms
snowy mountains?
J. convergent
K. divergent
L. transform
M. transition
Answer:
I believe it's j, convergent plate boundaries
The type of plate boundary that forms snowy mountains are convergent plate boundaries. option J is correct.
What are convergent plate boundaries?The convergent plate boundaries are which consist of two plates that move toward each other which results in the process called collision of two plates with each other.
The snowy mountains are full of snow which melts due to the change in temperature and leads to the formation of different plates and boundaries and the collision of two continental plates leads to the formation of this.
Therefore, option J is correct, the type of plate boundary that forms snowy mountains are convergent plate boundaries.
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How many molecules are in 4.5 moles of Ca(OH),?
We will use dimensional analysis to solve this.
We will need to know Avogadro's number, which is 6.02 × 10²³.
4.5 mol × [tex]\frac{6.02 * 10^{23} molecules}{1 mol}[/tex] = 2.71 × 10²⁴ molecules.
There are 2.71 × 10²⁴ molecules in 4.5 moles of Ca(OH).
HELP ASAP EILL MAKE BRAINLEST Students are conducting a la estimating the time takes for the cell cycle in normal chocols They find that the average time for one complete el cycle is 22 hours What arence would they expect to see nerous chien
Cancerous chicken cels will spend more time in the phase
Cancerous cells will not complete all phases of the cell cyce
Cancerus chin cells will complete moss in a shorter amount of time
O Cancerous chicken cols and normales will have the same total amount of time to complete the cell cycle
Answer: I don't know if this helps but here's some information I think might help.
Usually, cells will take between 5 and 6 hours to complete S phase. G2 is shorter, lasting only 3 to 4 hours in most cells. In sum, then, interphase generally takes between 18 and 20 hours. Mitosis, during which the cell makes preparations for and completes cell division only takes about 2 hours. Calculate the percentage of time spent in each phase by counting the total number of cells in each phase (total in interphase, in prophase, etc.) and dividing each by the total number of cells you counted. How do cancer cells differ in total time required for mitosis? Cancer cells produce 117 minutes faster than regular cells. ... Normal cells require 640 minutes during interphase, cancer cells only need 380. For prophase, cancerous cells need 15 minutes less than regular cells. Another hallmark of cancer cells is their "replicative immortality," a fancy term for the fact that they can divide many more times than a normal cell of the body. In general, human cells can go through only about 40-60 rounds of division before they lose the capacity to divide, "grow old," and eventually die 3.
can yall help me wit this?
Answer:
the color change
A student adds 3.00 g of dry ice (solid CO2) to an empty balloon. What will be the volume of the balloon at STP after all the dry ice sublimes (converts to gaseous CO2)?
