Answer:
a) Cell theory
Explanation:
Cell theory states that cells are the basic unit of life
When sand is mixed with water, it forms:
Answer:
Heterogeneous mixture.
(The composition is not uniform.)
How a non-polar molecule can ve madre of polar bonds?
Answer:
Explanation:
i cant understand the complete question, can you reword it and ill answer
Calculate the pH of a 0.09 M solution of HBr
Calculate the specific heat of an unknown metal if it took 58.1 J to increase the temperature of 89.4 g of the metal from 23.4°C to 25.5°C.
Answer:
[tex]c=0.309\ J/g^{\circ} C[/tex]
Explanation:
The increase in heat, Q = 58.1 J
Mass, m = 89.4 g
The temperature increases from 23.4°C to 25.5°C. We need to find the specific heat of an unknown metal.
We know that the increase in heat is given by :
[tex]Q=mc\Delta T\\\\c=\dfrac{Q}{m\Delta T}\\\\c=\dfrac{58.1}{89.4\times (25.5-23.4)}\\\\c=0.309\ J/g^{\circ} C[/tex]
So, the specific heat of an unknown metal is equal to [tex]0.309\ J/g^{\circ} C[/tex].
PLEASE ANSWER THESE QUESTIONS TO RECEIVE 30 POINTS AND TO RECIEVE A BRAINLIEST!!!! PLEASE AND NO LINK, SPAMMING OR GUESSING THESE ARE VERY IMPORTANT
What is potential energy?
moving energy
stored energy
renewable energy
nonrenewable energy
My flowers are not sweet-scented and I do not produce nectar. How am I pollinated?
By wind
By insects
By water
By explosive action
Which form of energy is produced when a guitar string vibrates?
Sound energy
Electrical energy
Chemical energy
Light energy
Brightly colored parts of flowers that attract insects.
petals
pistils
stamen
filaments
How many parent(s)are needed for asexual in plants?
4
1
9
100
1. stored energy
2. by wind
3. sound energy
4. petals
5. 1 parent
hope this helped <3
What is the concentration, in M, of a KBr solution that contains 0.0688 moles of
KBr dissolved in 0.250 liters?
2.75 M
3.63 M
1.78 M
0.275 M
Answer:
2.75M
Explanation:
Concentration(M)= mol/volume
0.0688mol/0.250L
=0.2752M
What is the freezing point of water if 15.0 g of NaCl is dissolved
in 100. g of water? (Kf of water = 1.86 K-kg/mol)
a
255 K
b 263 K
C273 K
d 268K
e 277 K
Answer:
263
Explanation:
A 25.0 ml sample of gas has a pressure of 760 torr. What is the volume of the gas if the pressure decreases to 380 torr ? Assume constant temperature.
Please help thanks.
Answer:
50mL
Explanation:
Using Boyle's law equation as follows:
P1V1 = P2V2
Where;
P1 = initial pressure (torr.)
P2 = final pressure (torr.)
V1 = initial volume (mL)
V2 = final volume (mL)
According to the information provided in the question,
V1 = 25.0mL
V2 = ?
P1 = 760 torr.
P2 = 380 torr.
Using P1V1 = P2V2
V2 = P1V1//P2
V2 = (760 × 25) ÷ 380
V2 = 19000 ÷ 380
V2 = 50mL
Which index fossil is most likely to be found in
the Allegheny Plateau?
Answer:
amphibians
Explanation:
please mark this answer as brainliest
in the reaction to prepare chlorine gas,4.35g of manganese dioxide (MnO2) reacted with concentrated hydrochloric acid (HCI) according to the following equation:
MnO2 + 4HCI = MnCL2 + 2H2O + Cl2
i) how many moles of manganese dioxide were there in the 4.35 g sample?
ii) how many moles of hydrochloric acid were required to reacy with 4.35g of manganese dioxide.
iii) Calculate the maximum number of water molecules that could be produced.
iv) how many atoms of hydrigen did this number of water molecules contain?
Answer:
mncL2 is the water molecule
which Scientific discovery resulted in the solid atom theory
being adapted into the Plum Pudding model of the atom?
Answer:
After discovering the electron in 1897, J J Thomson proposed that the atom looked like a plum pudding . To explain the two types of static electricity, he suggested that the atom consisted of positive 'dough' with a lot of negative electrons stuck in it.
Early historical models of the solar system were geocentric. Which of these phrases describes a geocentric solar system?
A. the sun as a reference point
B. existing in a star system
C. Earth as a reference point
D. circular, orbital path of travel
The accurate description of a geocentric solar system is the earth as a reference point.
The solar system refers to the arrangement of the sun and the planets. The description of the solar system in which the earth constitutes the center or reference point is called the geocentric model.
An alternative and more accurate model devised by Copernicus is the heliocentric model in which the sun lies at the center of the solar system.
Learn more: https://brainly.com/question/957540
What are the half-reactions for a galvanic cell with aluminum and gold electrodes?
A. A3+ (aq) + 3e > Al(s) and Au+(aq) + e* → Au(s)
B. Al(s) → A13+(aq) + 3e and Aut(aq) + e
Au(s)
C. AB+(aq) + 3e – Al(s) and Au(s) — Au (aq) + e
D. Al(s) → AB+(aq) + 3e and Au(s) → Au(aq) + e
Answer:B is right
Explanation: Al loses electrons and is oxidised, Au gains electron. And is reduced
To solve such this we must know the concept of half cell reaction. Therefore, the correct option is option B that is Al(s) → A1³⁺(aq) + 3e and Au(aq) + e [tex]\rightarrow[/tex]Au(s)
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Oxidation is loss of electrons and reduction is gain of electrons. The electron transfer from oxidant to reductant. Al loses electrons and is oxidized, Au gains electron. And is reduced.
Therefore, the correct option is option B that is Al(s) → A1³⁺(aq) + 3e and Au(aq) + e [tex]\rightarrow[/tex]Au(s)
Learn more about the chemical reactions, here:
brainly.com/question/3461108
#SPJ2
Calculate the pH of the solution, given the following (H+). Then identify the
solution as acidic, basic, or neutral. [H+]=7.94x10^-5 *
4.1; basic
0 6.9; basic
04.1; acidic
Answer: 4.1 Acidic
Explanation:
pH = -log(H+)
= -log (7.94x10^-5)
= 4.10017949757
= 4.1
any pH under 7 is acidic
Describe the conversion of light energy in a blackberry plant.
Answer:
Anthocyanins are used in organic solar cells because of their strong light harvesting, and their ability to convert this light energy into electrical energy.
Explanation:
Solar panels plug you into the sun by absorbing solar energy with photovoltaic (PV) cells. When hit with sunlight, they generate electricity which then flows into a device called an inverter which converts the electricity into a form (120 volts, 60Hz) for household use.
A functional group is a specific arrangement of atoms in an organic compound that is capable of characteristic reactions
Is this true of false
PLEASE HELPP ASAP I Would appreciate it
Answer:
True
Explanation:
Which of these is an example of a monotreme, a mammal that lays eggs?
1. wombat
2. platypus
3. opossum
4. whale
Answer: it is the 4th option in there
Explanation:
Answer:
It platypus
Explanation:
The Platypus lays eggs
If I fill a balloon with 5.2 moles of gas and it creates a balloon with a volume of 32.5 liters, how many moles are in a balloon at the same temperature and pressure that has a volume of 15.9 liters?
Answer:
5.2 multiple by 32.5
Ur answer divide by 15.9
169 divided by 15.9
ANSWER is 10.6
how many grams will be needed
In the image below, what is the name of the unstable molecule formed during the collision of A2 and B2?
A. Product
B. Activated complex
C. Reactant
D. Diatomic molecule
Answer:
ig activated complex coz reactants were diaatomic molecules and they were stable initially later on we collided them so they broke into activated complex and they were highly unstable so that they bonded again with another ion!!!! so according to me B is correct OPTION!!
The name of the unstable molecule formed during the collision of A2 and B2 from the image above is called the activated complex
Option B
The activated complex of molecular substance in a chemical reaction is refers to that state of particles that is in between the reactants and products.
In general, an activated complex is an unstable arrangement of molecules during reaction of substances
What is a molecule?A molecule can be defined as the smallest particle of a substance which can normally exist alone and still retain the properties of the substance
Learn more about molecules:
https://brainly.com/question/24411600
.The ___________ is the muscular organ that pumps blood through the circulatory system by rhythmic contractions and relaxation
heart
lungs
kidneys
liver
Help!!!
2KCIO.
2KOI
30,
2
How many moles of potassium Chlorate are needed to produce 15.0 moles of oxygen
Answer:
10 moles of potassium Chlorate are required to produce 15 mole of oxygen
Explanation:
The balanced chemical equation is
2KClO3(s)→2KCl(s)+3O2(g)
2 moles of potassium Chlorate produce 3 moles of oxygen
Number of moles of potassium Chlorate required to produce 1 mole of oxygen [tex]= \frac{2}{3}[/tex]
Number of moles of potassium Chlorate required to produce 15 mole of oxygen
[tex]= \frac{2}{3} * 15\\= 10[/tex]
10 moles of potassium Chlorate are required to produce 15 mole of oxygen
what the difference between a sodium atom (Na) and a sodium ion (Nal+)
Answer:
So a sodium atom has the electronic configuration 2,8,1 meaning it has 1 electron on its outer shell. It has a neutral charge since the number of electrons is equal to the number of protons.
A sodium ion is one that has lost the electron on its valence shell. The electronic configuration is 2,8 and it has a positive charge because it has more protons than electrons.
Answer:
[tex]\boxed {\boxed {\sf Number \ of \ electrons \ and \ net \ charge}}[/tex]
Explanation:
Remember that protons have a positive charge of +1 and electrons have a negative charge of -1. Atoms have protons and electrons.
A sodium atom has the electron configuration of 2-8-1. It has 11 electrons and its atomic number (number of protons) is also 11. This means it is a neutral atom because the charges of the electrons (-11) and protons (+11) balance each other out.
However, a sodium ion is different. It loses the 1 valence electron, so it only has 10 electrons. It still has the same atomic number of 11.
It is a not a neutral atom because the charges of the electrons (-10) and protons (+11) do not balance out. It has more protons and a net positive charge of +1. It is a cation or a positively charged ion.
Heat _____________.
A. Is the Internal energy of matter
B. Is the same as temperature
C. Is a measure of energy
D. Cannot move through a vacuum
Answer:
A. Is the Internal energy of matter
Hope this helps!
__Co + __F2 --> __CoF3
Answer:
2Co + 3F2 --> 2CoF3
Explanation:
When balancing an equation we need to ensure that the products used equal the reactants produced. Hence to balance the equation we need 3 F2 molecules so we have 6F atoms in total. and since 1 Co molecule bonds to 3 F molecules. We are gonna need to 2 Co molecules.
By the way...... what do those symbols for the elements have in common (for number 7-11): Pb, Au, Cu, Hg, Na ? *
Answer:
those have symbols for their Latin or Greek name
Explanation:
hope it helps
Answer:
Na number of 11
Explanation:
Pb no. 82
Au no. 79
Cu no. 29
Hg no. 80
To balance an equation, you need to write numbers called (BLANK) in front of the molecule or compound. DO NOT CHANGE THE SUBSCRIPTS!
Answer:
Coefficients
Which of these belongs in the outermost shell (energy level) of an atom?
A)Neutrons
B)Photons
C)Electrons
D)Protons
Answer:
C)Electrons
Explanation:
Hope this helped!!!
The equilibrium constant kc of the reaction H2+I2 produces HI is 54.3at430°C. Starting with 6.0moles,of HI moles of HI in 1.0dm^3 reaction vessel, calculate th5 concentration of H2,I2 and HI at equilibrium
Answer:
[H2] = [I2] = 0.64M; [HI] = 4.72M
Explanation:
Based on the reaction:
H2 + I2 ⇄ 2HI
The K is defined as:
k = 54.3 = [HI]² / [H2] [I2]
Where [] is molar concentration of each reactant at equilibrium
As the initial concentration of HI is 6mol/dm^3 = 6M the equilibrium concentration of each reactant is:
[H2] = X
[I2] = X
[HI] = 6 - 2X
Where X is reaction coordinate
Replacing:
54.3 = [6-2X]² / [X] [X]
54.3X² = 4X² - 24X + 36
0 = -50.3X² - 24X + 36
Solving for X:
X = -1.12. False solution, produce negative concentrations
X = 0.64M. Right solution
Replacing:
[H2] = 0.64M
[I2] = 0.64M
[HI] = 6 - 2*0.64M = 4.72M
Equilibrium concentrations are:
[H2] = [I2] = 0.64M; [HI] = 4.72MHelp would be majorly appreciated
Answer:
a) the atomic number is 15
b) the mass number is 15+16 = 31
c) element is phosphorus
d)Group 15 period 3