Answer: OB
Explanation:
The empirical formula of an element is the simplest formula of an element which shows the ratios of atoms of the each element present in a molecule of a compound .
74g of Ca(OH)2 (74 g/mol) in 340 ml solution
Answer:
This question is asking to calculate the molarity of the solution based on the information provided.
The answer is 2.94M
Explanation:
Molarity of Ca(OH)2 solution = number of moles (n) ÷ volume (V)
Using the formula below to calculate number of moles of Ca(OH)2.
mole = mass/molar mass
Molar mass of Ca(OH)2 = 74 g/mol
mole = 74g/74g/mol
mole = 1mol
Volume of Ca(OH)2 solution = 340ml = 340/1000 = 0.340 L
Molarity = 1/0.340
Molarity = 2.94M
Calculate the density of the baseball. Use the formula
D= m/V
where D is the density, m is the mass, and V is the
volume.
Determine whether the density of baseball is within the
legitimate range for an official baseball.
Record your answers in Table C of your Student Guide.
What is the density of the baseball?
g/cm3
The acceptable density range of official baseballs is
between 0.70 g/cm3 and 0.80 g/cm3. Is the
questionable ball in this range of acceptable density?
Answer:
0.73 and yes
Explanation:
The answers are 0.73 and yes! <3 ^-^
A sexually mature seahorse can produce thousands of offspring. What is the BEST reason overproduction of offspring by marine organisms is considered to be a reproductive advantage?
A:It increases competition.
B: It decreases competition.
C: It contributes to the organism’s biological success.
D: It causes stress on the environment which will apply stress to the creature to adapt.
describe how to calculate the relative atomic mass
Many people try to eliminate fat from their diets. Which is one reason it is
necessary for humans to eat fat?
Answer:
C
Explanation:
While it is common to notice that many people avoid food that contain fat due to the fact that they are avoiding the adverse implications of fat consumption, the consumption of fat also has some advantages.
Prominent among the advantages of fat in the body is that fat cushions the internal organs. This cushioning of the internal organs avoids sudden damage to these organs.
For this reason, it is necessary for humans to eat fat.
Which of the following are HETEROGENEOUS mixtures from this list (check all that apply).
A. Air
B. Sweet Tea
C. Trail mix
D. Soil
E. Beach sand
F. Water
When particles lose heat, what else is true?
Answer:
Answer: When the particles lose heat they move slower and have decreased kinetic energy.
How many grams would be in 1.752 x10^26 formula units of Ca(No3)2
Answer:
47730 grams.
Explanation:
First we convert 1.752x10²⁶ formula units of Ca(NO₃)₂ into moles, using Avogadro's number:
1.752x10²⁶ formula units ÷ 6.023x10²³ formula units/mol = 290.88 molThen we convert 290.88 moles of Ca(NO₃)₂ into grams, using the molar mass of Ca(NO₃)₂:
290.88 mol * 164.088 g/mol = 47730 gA cylinder of hot gas with pressure of 2.81 atm is at 371°C. It is then
cooled to 85°C. What is the gas pressure at the lower temperature?
Help
Answer: 3.38 Atm is the partial ressure of each gas
The balanced chemical equation for the reaction between sodium chloride and silver nitrate is:
NaCl ( aq ) + AgNO3 ( aq ) AgCl ( s ) + NaNO3 ( aq )
We can interpret this to mean:
1 mole of sodium chloride and mole(s) of silver nitrate
React to produce:
mole(s) of silver chloride and mole(s) of sodium nitrate
Answer:
We can Interprete it as 1mole of Sodium Chloride and 1mole of Silver Nitrate React to Produce
1Mole of Silver Chloride and 1Mole of Sodium Nitrate
Answer:NaCL
Explanation:Edg
An endothermic dissolution process a. absorbs energy as heat and has positive enthalpy of solution. b. releases energy as heat and has positive enthalpy of solution. c. absorbs energy as heat and has negative enthalpy of solution. d. releases energy as heat and has negative enthalpy of solution.An endothermic dissolution process a. absorbs energy as heat and has positive enthalpy of solution. b. releases energy as heat and has positive enthalpy of solution. c. absorbs energy as heat and has negative enthalpy of solution. d. releases energy as heat and has negative enthalpy of solution.
Answer:
a. absorbs energy as heat and has positive enthalpy of solution.
Explanation:
A reaction can either be exothermic or endothermic. An endothermic reaction, as the dissolution described in the question, is that which absorbs heat energy from the surroundings in order to start the reaction.
Because an endothermic reaction makes heat lost from the surroundings, the enthalpy (∆H) of the solution will be positive (+). ∆H is got by finding the difference between the enthalpy of the reactants and products and since the enthalpy of a product in endothermic reaction is more, the enthalpy change (∆T) will be positive.
4. How would you calculate the poH of a base when given the
concentration of [OH]-?
Answer:
Use pOH = -log₁₀ [OH-]
Explanation:
pOH can be calculated from the concentration of hydroxide ions using the formular below:
pOH = -log₁₀ [OH-]
The pOH is the negative logarithm of the hydroxide ion concentration.
The greenhouse gas released into the atmosphere as a result of livestock digesting their food is called carbon dioxide
True
False
Answer:
False
Explanation:
Cows and other livestock release methane, which is a gas like Carbon Dioxide, but not the same thing, even though it does contribute into Carbon Dioxide.
Which is the balanced equation for a reaction between hydrogen gas and oxygen gas
Answer:
it is known that two molecules of hydrogen gas, H2, react with one molecule of oxygen gas, O2, to form two molecules of water, H2O. This reaction may be represented by the chemical equation 2H2+O2→2H2O. The formula weight of hydrogen gas is 2.01594, that of oxygen gas 31.9998, and that of water 18.01534
Answer:
it is known that two molecules of hydrogen gas, H2, react with one molecule of oxygen gas, O2, to form two molecules of water, H2O. This reaction may be represented by the chemical equation 2H2+O2→2H2O. The formula weight of hydrogen gas is 2.01594, that of oxygen gas 31.9998, and that of water 18.01534
Explanation:
the user above
Consider an ideal gas contained in a cylinder with the volume 34.4L, temperature 667K and pressure 2atm.What will be pressure of the gas if it is heated at 1000k and the volume becomes 50L.
Given :
An ideal gas contained in a cylinder with the volume 34.4L, temperature 667K and pressure 2 atm.
To Find :
What will be pressure of the gas if it is heated at 1000k and the volume becomes 50L.
Solution :
We know, by ideal gas equation :
[tex]Pv = nRT[/tex]
Now, in the given question only their are two state and also their is no leakage so amount of gas is also constant.
So,
[tex]\dfrac{P_1V_1}{T_1} = \dfrac{P_2V_2}{T_2}\\\\\dfrac{2\times 34.4}{667} = \dfrac{P_2 \times 50}{1000}\\\\P_2 = \dfrac{2\times 34.4 \times 1000}{667 \times 50}\ atm\\\\P_2 = 2.06 \ atm[/tex]
Therefore, the pressure of gas is 2.06 atm.
What is the pH of a solution that contains 0.009 grams of oxalic acid in 100
mL of water?
Answer:
pH = 3.0 ya that's it......
I need help for chemistry, I barely know English...
Answer:
6c12
Explanation:
Its is the change in energyof a neutral atom when an electron to the atom to form negativeion, thus neutral atom gain electon.What property of element is being described
Answer:
Electron affinity.
Explanation:
An atom can be defined as the smallest unit comprising of matter that forms all chemical elements. Thus, atoms are basically the building blocks of matters and as such determines or defines the structure of a chemical element.
Generally, atoms are typically made up of three distinct particles and these are protons, neutrons and electrons.
Electron affinity can be defined as the ability of an atom of a chemical element to accept or accommodate an electron.
This ultimately implies that, electron affinity is the change in energy of a neutral atom of a chemical element when an electron is added to the atom to form negative ion, thus, a neutral atom gain electron.
In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
Both Arrhenius and Bronsted-Lowry defintions of an acid are similar. According to both of these definitions, an acid is a compound that -
donates a pair of electrons
contains a nonmetal anion
donates a hydrogen ion
should be labeled as corrosive
Answer:Donates a hydrogen ion
Explanation:
The valences of metal x,y and z are 1,2 and 3 respectively. What are the formulae of their;a) hydroxides, b) sulphates, c) hydrogen, d) carbonates, e) nitrates, f) phosphates
Answer:
See answer below
Explanation:
AS we know that the valence for those metals X, Y, and Z are 1, 2 and 3, we can determine the formula of each compound.
1. Hydroxides.
An hydroxide is formed when an oxyde of a metal reacts with water. When this happens, the general molecular formula is:
Meₐ(OH)ₙ
Where:
a: valence or charge of the hydroxide (Which is -1)
n: valence of the metal.
Following this, the formula for X, Y and Z would be:
XOH
Y(OH)₂
Z(OH)₃
2. Sulphates
Sulphates follow a similar rule of hydroxide in the general molecular formula, but instead of having a charge of -1, it has a charge of -2 so:
Mₐ(SO₄)ₙ
So, following the rule:
X₂SO₄
Y₂(SO₄)₂ ------> YSO₄
Z₂(SO₄)₃
3. Hydrogens
Following the same rule as the previous, hydrogens works with a charge of -1, so:
MₐHₙ
Then:
XH
YH₂
ZH₃
4. Carbonates.
This follows the same rule as sulphates, with the same charge so:
Mₐ(CO₃)ₙ
Then:
X₂CO₃
YCO₃
Z₂(CO₃)₃
5. Nitrates
Follow the same rule as the hydroxides, with the same charge of -1.
Mₐ(NO₃)ₙ
Then:
XNO₃
Y(NO₃)₂
Z(NO₃)₂
6. Phosphates
In the case of phosphates, these have a charge of -3 so:
Mₐ(PO₄)ₙ
Then:
X₃PO₄
Y₃(PO₄)₂
Z₃(PO₄)₃ ----> ZPO₄
Hope this helps
Which part of an organism is LEAST likely to form a fossil?
A. skin
B. tooth
C. bone
D. shell
Answer:
[tex]\huge \fbox \pink {A}\huge \fbox \green {n}\huge \fbox \blue {s}\huge \fbox \red {w}\huge \fbox \purple {e}\huge \fbox \orange {r}[/tex]
A. Skin
Explanation:
Skin unlike teeth, bones & shells is fragile & get decomposed easily under the soil.
Answer:
um a I think because when you look at dinosaur you don't see their skin anymore just like the bones and teeth
what uses a coil that is a temporary electromagnet
Answer: transformers, generators ,inductors, electric motors
Explanation:
What is represented by the dashed blue line and the solid black line in the image below? motion,vectors,scalars,distance,displacement
Answer:
Distance
Explanation:
There as you see the lines are in a following of a path, like marathon. IT also states above each structure. Start and finish, why would it show motion. It shows distance.
0.630 moles of sodium chloride are how many grams (with calculation)
Answer:
Heyaa!! Im Pinky and Im here to inform you that your answer is...
Explanation:
!!! 36.8189451 Grams !!!
Have an amazing day!!!
~Pinky~!!
a concentrated solution of sulfuric acid, H2SO4, has a concentration of 18.0 M. How many mL of the concentrated acid would be required to make 250. mL of a 1.00 MH2SO4 solution?
Answer: A 13.88 mL of the concentrated acid would be required to make 250. mL of a 1.00 M [tex]H_{2}SO_{4}[/tex] solution.
Explanation:
Given: [tex]M_{1}[/tex] = 18.0 M, [tex]V_{1}[/tex] = ?
[tex]M_{2}[/tex] = 1.00 M, [tex]V_{2}[/tex] = 250 mL
Formula used to calculate the volume of concentrated acid is as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]
Substitute the values into above formula as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}\\18.0 M \times V_{1} = 1.00 M \times 250 mL\\V_{1} = \frac{1.00 M \times 250 mL}{18.0 M}\\= 13.88 mL[/tex]
Thus, we can conclude that 13.88 mL of the concentrated acid would be required to make 250. mL of a 1.00 M [tex]H_{2}SO_{4}[/tex] solution.
What happens during a lunar eclipse?
A
Earth passes between the sun and the moon.
B
The moon passes between the sun and Earth.
C
The sun passes between Earth and the moon.
D
Earth, the sun, and the moon are at right angles in space.
Answer:
A.EARTH PASSES BETWEEN THE SUN AND THE MOONExplanation:
When Earth passes directly between Sun and Moon, its shadow creates a lunar eclipse.
pabrainliest po plss:)
Determine the empirical formula of a compound containing 0.57% hydrogen, 72,1% Todine, and 27.3\% oxygen.
What structure behind the eardrum touch that membrane?
Answer:
The middle ear is the portion of the ear internal to the eardrum, and external to the oval window of the inner ear. The mammalian middle ear contains three ossicles, which transfer the vibrations of the eardrum into waves in the fluid and membranes of the inner ear.
Explanation:
(Quick pls!! Just the answer, no links) Which scenario is an example of a scientific way of thinking?
A. A researcher reviews images of lunar eclipses taken by
professional photographers and then ranks them in order of which
are the most beautiful
B. A researcher writes to a government representative to convince
the representative to encourage public participation in eclipse
watching
C. A researcher analyzes data on the motions of the Moon and Earth
and then makes a prediction about when the next lunar eclipse will
ocour
D. A researcher reade several different articles on the beat way to
enjoy a lunar eclipse and then decides which method is beat
Explanation:
The right answer is C
Hope i could be helpful
¿Qué estudia la química orgánica?
Answer: el estudio de la síntesis, estructura, reactividad y propiedades del diverso grupo de compuestos químicos construidos principalmente de carbono
Explanation:Hope I helped:)