Answer:
In February, we have selected iron, the most abundant element on Earth, with chemical symbol Fe (from the Latin word “ferrum”) and atomic number 26. A neutral iron atom contains 26 protons and 30 neutrons plus 26 electrons in four different shells around the nucleus.
Answer:
Iron's atomic number is 26 and it has 26 protons
Salt solution is homogeneous mixture.Give reason
Answer:
because mixed particles are invisible in this mixture.
Latanya brown is a nine-year old african american who is hospitalized with acute sickle cell crisis. the pharmacist is preparing intravenous fluids for this patient. she adds 2 grams of potassium chloride to 1 l of d5w/1/2 normal saline. what is the estimated osmolarity per liter (mosm/l) of this solution assuming the final volume is 1L (mw of sodium =23, potassium=39, chloride=35.5, and dextrose is 198)?
Answer:nb mhvj
Explanation:
hvvmjhv
What is the product of the unbalanced combustion reaction below?
C3H2(g) + O2(g) →
The Periodic Table
A. 04Hg(s) + C(s)
B. C(s) + H2(g) + O2(g)
C. CO2(g) + H2O(g)
D. C3H802(s)
1.3499999995 rounded to three significant figures.
After rounding off to three significant figures :
[tex] \boxed{ \boxed{1.35}}[/tex]
We are driving to Orlando. The sign says
that it is 145 kilometers to Orlando.
How many meters is it to Orlando?
A: 0.145
B: 145,000
C: 14.5
D: 14,500
Answer:
b
Explanation:
there is 1000m in 1 km so the ans is literally just 145x1000 m which is 145000m
Answer:
B! 145,000
Explanation:
your welcome love!
You are starting a new item and after reading the first part you realize you have no idea how to go about answering it. What should you do
1) Guess randomly and hope for some useful feedback.
2) Request the solution immediately.
3) Use the available hints.
Answer: 3
Explanation: You may not always get feedback that would be helpful and requesting the answer would be cheating
Anti coagulant usend in blood sampling
Answer:
Ethylenediaminetetraacetic acid (EDTA), heparin, and citrate are the most commonly used anticoagulants (39–41). pls mark me branilest
HELPPP!!!
11) An international set of units which are used in Science and based on the Decimal System A. Basic Units
B. Derived Units
C. Metric (SI) Units
D. English (Common) Units
E. Random Errors
12) Standard units that can actually be measured with an instrument or device
A. Basic Units
B. Derived Units
C. Metric (SI) Units
D. English (Common) Units
E. Random Errors
13) An older system of units, still used in USA for commerce and construction
A. Basic Units
B. Derived Units
C. Metric (SI) Units
D. English (Common) Units
E. Random Errors
14) Mistakes due to carelessness or lack of verification
A. Basic Units
B. Derived Units
C. Metric (SI) Units
D. English (Common) Units
E. Random Errors
15) units that must be calculated from measured values
A. Basic Units
B. Derived Units
C. Metric (SI) Units
D. English (Common) Units
E. Random Errors
Answer:
11. A
12. B
13. D
14. E
15. C
Which type of model best represents crystals?(1 point)
ball-and-stick
ribbon
Lewis dot
space-fill
Which option describes the molecule geometry of a molecule with one bond and three lone pairs?(1 point)
angled
octahedral
tetrahedral
linear
Answer: angular
Explanation:
Angular and is found in hydrogen...from sighwell assumption saying that is they is three pairs of electrons in the valence shell of the central atom the orbital will oriente at an angle of 120° to form a bond of trigonal planar or angular.
Answer:
1) ball and stick is right just did this on my test.
2) linear
Explanation:
Subtract to find the temperature changes
for the water and the metal.
I
°C
AT (water) =
AT (metal) = -1
°C
Copper
Answer In picture
Answer:
1.9
Then
-75.4 C
Explanation:
In tHe PiCtuRe
What is the formula of the compound in which the atom combining ratios are:
magnesium : bromine = 1:2
Enter elements in the order given:
Please help me with this
Answer:MgBr2
Explanation:
Which statement describes a physical property of steel? O A. Steel is formed from an alloy of iron and carbon. O B. Steel has a density of 8050 kg/m3. O C. Steel is oxidized by air to form rust. O D. Steel reacts with sulfuric acid to form hydrogen gas.
Answer:
A
Explanation:
Using the ruler, what is the value of A considering significant
figures?
Answer:
13.7 cm
Explanation:
If the number is between two whole numbers then that means it is going to be a decimal, how to determine the decimal is by how many ticks/lines are between it, so if you count from 13 cm and count each line as 1 you get to the number 7 and since that number is between the whole number it becomes 13.7
Which statement correctly compares the number of protons and electrons in atoms of rubidium (Rb) and calcium (Ca)?
(1 point)
Rubidium has more protons and fewer electrons than calcium.
Rubidium has fewer protons and more electrons than calcium.
Rubidium has more protons and more electrons than calcium.
Rubidium has fewer protons and fewer electrons than calcium.
Answer:
Chemical elements are categorized in the Periodic Table based on the number of protons and electrons. The electrons are the sub-atomic particle, which revolves around the atomic nucleus and has a negative charge. The protons are the positive charged sub-atomic particles, which are present in the nucleus of the atom.
Explanation:
The chemical element is a pure particle, which is made up of atoms. The atoms in a neutral chemical element have the same number of electrons and protons. In the case given above, calcium has fewer protons and electrons than rubidium. Calcium has the atomic number 20, such that it belongs to group 2 and period 4. The number of electrons and protons in calcium (no net charge) is 20. Similarly, the rubidium belongs to group 1 and period 5. The element has the atomic number 37, such that the number of electrons and protons in rubidium is 37.
Identify which subatomic particles match each of these descriptions. One of the descriptions describes two particles. Make sure to include both particles it describes. Description Particle(s) have a relative charge of +1 have a relative charge of -1 have no charge located in the nucleus of an atom have a much lower mass than the other two types of particles Answer Bank protons electrons neutrons
Explanation:
protons have a relative charge of +1, they are located in the nucleus and the carry a positive charge
the electrons are negatively charged and have a charge of -1 . They are found orbiting on the shells .the electrons have a negligible mass of 1 / 1840
the neutrons have no charge they are located in the nucleus of an atom .
Anyone know the answer ?
The correct answer is: Avogadro
The Avogadro constant (NA or L) is the proportionality factor that relates the number of constituent particles (usually molecules, atoms or ions) in a sample with the amount of substance in that sample. Its SI unit is the reciprocal mole, and it is defined as NA = 6.02214076×1023 mol−1.
The answer is Avogadro.
Explanation:
Here are the examples :
The mass of a single carbon-12 atom has been found to be 1.992×10^-23 g using a mass spectrometer. The number of atoms in exactly one mole of 12C is 6.02×10^23. This can be shown by the following calculation.
Na = Mass per mole of 12C ÷ Mass of one atom of 12C
= 12g/mol ÷ 1.992×10^-23
= 6.02 × 10^23 mol^-1
Thus one mole of any substance contains 6.02×10^23 particles. This number is called the Avogadro constant.
So that 12g of the element carbon , 1 g of the element hydrogen and 32g of the element sulphur contains 6.02×10^23 atoms even though the element carbon exist as atoms, and Hydrogen and sulphur exist as molecules.
I hope it can help you
(3.6 x 104) / (4 x 10-6)
Answer:
930 pls mark me branilest
Answer:
11.0117647
Explanation:
I’m so confused somebody help lol
Answer:
lol☺️☺️☺️☺️☺️☺️☺️☺️
A student was adding NaOH to two different acid solutions, HCl and HF, until a pH of 7 was reached in both solutions. The acids had the same initial volume, and both had an initial pH of 4.5. Which statement is true regarding the amount of NaOH added to each acid?
The factor in an experiment that is being tested and measured is known as the:
Answer:
The dependant variable
Explanation:
The dependent variable is the factor that is being tested and measured in an experiment.
Difference between heavy chemicals and fine chemicals
Answer:
Fine chemicals are used as starting materials for specialty chemicals, particularly pharmaceuticals, biopharmaceuticals and agrochemicals. ... The term "fine chemicals" is used in distinction to "heavy chemicals", which are produced and handled in large lots and are often in a crude state.
Explanation:
Which choice below represents a negative impact that chemistry has on society?
development of cancer treatment drugs
development of Teflon, the nonstick material used in cookware
combustion of car engines producing pollutants in the air
the development of nuclear power plants used to produce electricity
Answer:
combustion of car engines producing pollutants in the air
When copper is changed to copper(II) nitrate by the nitric acid, it is an example of a(n) ______-_______ reaction. (two words, include the hyphen with no spaces)
Answer:
oxidation- reduction
Explanation:
where gaining electronic reduces one element and losing them oxidize the other nitric acid is not only strong it is also a oxidizing agent
Oxidize: copper = Cu+2When copper is changed to copper(II) nitrate by the nitric acid, it is an example of an oxidation-reduction.
What is molecule?
Molecule is defined as number of atoms combined together, that shows the most smaller chemical compound's fundamental unit that participate in chemical reaction. In the combination of atoms attractive forces play a vital role and it helps to bound the atoms by a chemical bond.
Liquid consist of small range of order and the reason behind this is intermolecular attractive force which is very strong and due to this reason molecules are packed together tightly. Due to presence of high kinetic energy the molecules present in the liquid move rapidly and fastly with one another.
Water is considered to be the simpler molecule and it consist of hydrogen and oxygen atom bounded together and due to the reason of high electronegativity of the oxygen's atom the bonds present are polar as well as covalent. Due to presence of high kinetic energy the molecules present in the liquid move rapidly and fastly with one another.
Therefore, When copper is changed to copper(II) nitrate by the nitric acid, it is an example of an oxidation-reduction.
Learn more about chemical and physical property here:
https://brainly.com/question/1935242
#SPJ2
Why non quantitative observation are not useful?
Quantatative is when a number of something changes, and we could sometimes visualize it, but qualitative is different.
Hope this helps
kenny
:D
Describe what each letter and number
means in the chemical formula below.
C.H₂O
Answer: c is carbon h is hydrogen with the 2 means 2 hydrogen and o is oxygen
In conclusion alphabets represent elements and numbers represent how many elements
Which of the following symbolic representations of matter signifies a mixture of elements?
Answer:
[tex]{ \sf{A \: and \: C \: \: only }}[/tex]
Differentiate between. Melting and freezing point. Elements and compounds . Evaporation and condensation. Compound and mixture.
Answer:
Melting poing is the temperature at which a solid changes to liquid under atmospheric pressure. Freezing point is the temperature at which liquid changes to solid under atmospheric pressure.
Elements are substances that are made from one type of atom. An element cannot be broken down into any other substance. ... Compounds are substances made from atoms of different elements joined by chemical bonds. They can only be separated by a chemical reaction.
Compounds are formed because of chemical bonding between two elements. Mixtures are formed when substances are physically mixed with one another. Compounds are basically of three kinds : Ionic, metallic and covalent
Who believed and tested his idea that microorganisms are carried through the air?
A cylinder fitted with a movable piston and filled with a gas has a volume of 188.5mL at 26.7 °C when the applied pressure is 755.2 torr. The temperature of the oil bath surrounding the cylinder was increased to 165.2 °C, and the load on the piston was changed. Careful measurement now gave a value of 210.5mL for the volume. What was the final pressure in the system, in torr? Select one:
O a. 715.5 tor O b. 576.9 torr Oc. 988 6 torr O d. 1233 torr 462.6 tor
Answer:
C
Explanation:
To find the new pressure, we will use this formula: P₁V₁/T₁ = P₂V₂/T₂
P₁ = Original pressure (755.2)
V₁ = Original volume (188.5)
T₁ = Original temperature in kelvins (26.7 + 273.15 = 299.85)
P₂ = Final Volume (?)
V₂ = Final volume (210.5)
T₂ = Final temperature in kelvins (165.2 + 273.15 = 438.35)
Here is our equation
(755.2)(188.5)/(299.85) = (210.5)P₂/(438.35)
Hopefully, you have a calculator handy because this equation will end up looking like this:
474.75471 = (0.48021)P₂
Divide both sides by the coefficient
474.75471/0.48021 = (0.48021)P₂/0.48021
P₂ = 988.64
convert methanol to ethanol
ANSWER:
We can convert methanol into ethanol by an organic coupling reaction which is called Wurtz reaction. This is carried out with sodium metal in the presence of dry ether and forms higher alkanes.
