Science chemistry Question:
Are you doing a quiz?
The charge on an atom is written as a _____________.
Answer:
zero
Explanation:
For a single atom, the charge is the number of protons minus the number of electrons. Find the charge by balancing charge in a compound.
Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. Therefore, the charge on an atom is written as a superscript.
What is Ions?Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.
Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state. The charge on an atom is written as a superscript.
Therefore, the charge on an atom is written as a superscript.
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Observations are made by using one of the five senses (touch, sight, taste, smell, hearing) to gather information.
Kenneth sees the rock shown below.
Kenneth wants to write down an observation about the rock in his science notebook.
Which of the following is a scientific observation?
A.
The rock came from a cave.
B.
The rock is pretty.
C.
The rock is purple.
D.
The rock is very old.
answer B the rock is purple
HELP FASTTTTT WILL GIVE BRAINLIEST
The enthalpy of formation of C2H5OH is -238.7 kJ/mol. What information does this reveal about the bonds in the molecule?
a. Bond formation in C2H5OH from its elements only occurs in cold temperatures.
b. Bond formation in C2H5OH from its elements releases energy.
c. Bond formation in C2H5OH from its elements does not occur.
d. Bond formation in C2H5OH from its elements absorbs energy.
2C + 3H2 + 1/2 O2 --> C2H5OH dH = -238.7 kJ/mol.
hope it helpsUsing the formula F = (9/5)C + 32, convert 17°C into Fahrenheit. A. 41.4°F B. 50.8°F C. 60.2°F D. 62.6°F
Answer:
D. 62.6°F
Explanation:
F = (9/5)C + 32
We know that C = 17°, so:
F = (9/5)(17°) + 32
9/5 = 1.8 and 1.8 * 17 = 30.6
F = 30.6° + 32
F = 62.6°
Why would A zoological veterinarian be a good job. DO NOT COPY AND PASTE. please do a paragraph why.
Answer:
it could be a good job because you will get the chance to explore how animals work not only that zoological veterinarian helps animals if they are in danger or needs help immediately. there are much more benefits for zoological veterinarian
can you guys help me with this one too
Use the atomic model below to answer the following questions: 1 pt for each blank
How many protons? How many neutrons? What is the name of this atom?
its a k12 test question TwT
Answer:
Explanation:
ALRIGHT EPIC GAMER IM GONNA INTRODUCE YOU TO THE AWESOME WORLD OF THE PERIODIC TABLE
look at this
6
C
Carbon
12.011
ok so this is what one block on the periodic table looks like
the protons and electrons are going to be the smaller number
so the protons and electrons for carbon are 6
but your question does not ask for electrons so its fine.
How many protons? LOOK AT THE SMALLER NUMBER IN ELEMENT BLOCK ON PERIODIC TABLE.
How many neutrons? Take the bigger number and subtract the smaller number from it. so it would be for carbon: 12.011 - 6 = 12 neutrons.
to find the name of the atom, just count the number of electrons and then look for the element with the same number to find the name
Ioijihjghigyfhjjiiujhfcgj jjjdf
Answer:
this are the topics of biology so you have to learn this topics.
1) An enzyme is a secretion that helps the cell to perform its basic functions.
2) Activation energy is the minimum energy required for a cell to operate.
3) gastritis is an acid secreted by the stomach. it is a very strong acid
The mass number of an atom is the number of
Answer:
protons plus neutrons
Explanation:
jsut the definition
Answer:
protons
Explanation:
the sum of the numbers of protons and neutrons present in the nucleus of an atom
Which of these elements has the smallest atomic radius?
1. C
2. Be
3. B
4. Li
Answer:
3. be
Explanation:
it shows it in the word search
Explain with three or more sentences why dog island has valid information or why the website is a hoax’s
..
What is the name of the ionic compound: Sr(MnO4)2
Answer:
Strontium Permanganate
Explanation:
PLS HELP I WILL GIVE BRAINLIEST IF YOU ARE RIGHT Which organelle is used for
transportation?
A nucleus
B. golgi bodies
C. cell membrane
D. endoplasmic reticulum
Answer:
a
Explanation:
I need help with this
71 milliliters if you are using milliliters. In chemistry, you measure from the bottom of the miniscus.
Given the following balanced chemical equation, 2 NaClO3 → 2 NaCl + 3 O2, how many moles of O2 will be produced from 8.21 moles of NaClO3?
Answer:
12.3 mo
Explanation:
Given the following balanced chemical equation, 2 NaClO3 → 2 NaCl + 3 O2, how many moles of O2 will be produced from 8.21 moles of NaClO3?
for every 2 moles of NaClO3, you produce 3 moles of O2.
so for O2 you produce 3/2 the moles of NaClO3
so 8.21 moles of NaClO3 will produce 8.21 X 3/2 moles of O2
=12.3 mole
A 3.33 gram sample of iron ore is transformed to a solution of iron(II) sulfate, and this solution is titrated with 0.150 M potassium dichromate. If it required 41.4 mL of potassium dichromate solution to titrate the iron(II) sulfate solution, what is the percentage of iron in the ore
Answer:
tobacco
Explanation:
in the spectrophotometric method, you were instructed to obtain the phosphate stock solution in a dry beaker. why is this? how would the slope of your calibration curve be affected if your beaker was not dry?
If wet beakers are used, a systematic error is introduced and the calibration curve for the determination will be inaccurate.
Spectrophotometry is a method of analysis that depends on the interaction of light with matter. Usually, the absorbance of light depends on the concentration of the sample.
In order to use the spectrophotometric method, a calibration curve is first prepared and used to determine the concentration of the unknown sample. A dry beaker should be used to avoid dilution of the standard solutions used for calibration. If they are diluted, a systematic error is introduced and the calibration curve for the determination will be inaccurate.
The slope of the of this experiment is a measure of sensitivity and a wet beaker will give the false impression of low sensitivity.
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PLZ HELP ITS TIMED AND IM STUCK
Answer:
I belive its A
Explanation:
A makes more sence then all of them
Why do metals tend to be good conductors of electric current?
A.Metals have more negative charges than positive charges, which produces electric currents.
B.The force of attraction between metal ions and electrons is very weak, causing electrons to flow out of the metal.
C.Valence electrons of metals are very mobile and can carry electric current through the metal.
D.Cations and anions in the metal easily move in opposite directions, carrying electric current
Answer:
C.Valence electrons of metals are very mobile and can carry electric current through the metal.
Explanation:
Metal is made or held together by metallic bonds. Basicaly the valence electrons are free to move through an intire body of metal.
Describe a few rocks that are composed of nonmineral matter
Why do automobiles rust more easily in wet climates than drier climates.
Answer:
The iron rusts more easily in wet climates because there is more water in the air, this allows more oxygen to come in contact with the metal to rust.
Explanation:
What volume (in mL) of 0.2600 M HBr is
required to neutralize 40.00 mL of 0.8000 M
NaOH?
The volume of 0.26 M HBr required to neutralize 40 mL of 0.8 M NaOH is 123.08 mL
We'll begin by writing the balanced equation for the reaction. This is given below:
HBr + NaOH —> NaBr + H₂O
From the balanced equation above,
The mole ratio of the acid, HBr (nA) = 1
The mole ratio of the base, NaOH (nB) = 1
From the question given above, the following data were:
Volume of base, NaOH (Vb) = 40 mL
Molarity of base, NaOH (Mb) = 0.8 M
Molarity of acid, HBr (Ma) = 0.26 M
Volume of acid, HBr (Va) =?The volume of the acid, HBr needed for the reaction can be obtained as follow:
MaVa / MbVb = nA / nB
0.26 × Va / (0.8 × 40) = 1
0.26 × Va / 32 = 1
Cross multiply
0.26 × Va = 32
Divide both side by 0.26
Va = 32 / 0.26
Va = 123.08 mLTherefore, the volume the acid, HBr needed to neutralize the base, NaOH is 123.08 mL
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The electrons in the outermost shell are called valence electrons. How many valence electrons does the
above atom have?
Answer:7
Explanation:All halogens have 7 valence electrons. Valence electrons are the total number of electrons present in the outermost shell of an atom (i.e. Seven valence electrons. There are thus 7 valence electrons for Fluorine, 2 in the 2s orbital, and 5 in the 2p orbitals.
Please help!!
KOH + HBr → KBr + H2O
A student sets up a titration apparatus with 25 mL of potassium hydroxide in the flask. In three to five sentences, explain how the student can use a 0.1 M solution of hydrobromic acid to determine the concentration of potassium hydroxide in the reaction.
A known volume of 0.1 M solution of hydrobromic acid is reacted with 25 mL and the concentration of the potassium hydroxide is calculated from the stoichiometry of the reaction.
Titration is a kind of reaction in which the concentration of an unknown solution is determined by reacting a known volume of this solution with a known volume of a standard solution and carrying out the necessary stoichiometric calculations in order to obtain the concentration of the unknown solution.
To obtain the concentration of the potassium hydroxide solution, 25mL of this solution is reacted with a carefully measured volume of the 0.1 M solution of hydrobromic acid. The volume of 0.1 M solution of hydrobromic acid required to reach end point is used calculate the concentration of the potassium hydroxide solution.
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Which of the following is a scientific question about the planet Jupiter?
A. Why was Jupiter named after a Roman god?
O B. Why is Jupiter a fascinating planet to observe?
C. How often is Jupiter visible in the nighttime sky?
D. Does the big red spot on Jupiter look like a giant eye?
SHRMIT
Answer:
C
Explanation:
All of the other options fall under either history or subjective opinion, and C is the only one which refers the actual properties of the planet itself.
Holding your hand over a hot plate is an example of
because
Answer:
Radiation
Explanation:
Frases con masa atómica
Answer:
Si ha mirado una tabla periódica, es posible que haya notado que la masa atómica de un elemento rara vez es un número par. Dupdo
Un Dalton, también conocido como unidad de masa atómica, es aproximadamente la masa de un solo protón o neutrón. Dupdo
Es decir, el deuterio tiene el doble de masa atómica que el protio y el tritio tiene tres veces la masa atómica del protio. Dupdo
El número bariónico, que es equivalente al número de masa atómica, debe permanecer constante para que se produzca una reacción.
Explanation:
A sample of 10.5 g of nitrogen reacts with 20.2 g of hydrogen to produce ammonia.
3H2 (g) + N2 (g) → 2NH3 (g)
I need help answering these questions
The mass of NH₃ produced in the reaction of 10.5 g of nitrogen and 20.2 g
of hydrogen is 12.75 g
The balanced chemical equation is represented as follows:
3H₂ (g) + N₂ (g) → 2NH₃ (g)
Knowing the limiting reagent will assist us to ascertain the amount of Ammonia produced.
Therefore,
mass of H₂ = 20.2 g
molar mass = 2g/mol
moles = 20.2 / 2 = 10.1 moles
10.1 / 3 = 3.36666666667
mass of N₂ = 10.5 g
molar mass N₂ = 28 g /mol
moles = 10.5 / 28 = 0.375 moles
0.375 / 1 = 0.375
Therefore, nitrogen is the limiting reagent and it will determine the amount
of product formed.
28 g of N₂ gives 2(17) g of NH₃
10.5 g of N₂ will give ? of NH₃
cross multiply
mass of NH₃ produced = 10.5 × 34 / 28
mass of NH₃ produced = 357 / 28
mass of NH₃ produced = 12.75 g
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Answer:
A- 12.75 g
B- Nitrogen
C- Hydrogen
D- 17.95 g extra
E- 32.16%
You forgot the questions. Here they are:
A-Calculate the theoretical yield of the product (in grams).
B-Indicate the limiting agent.
C-Indicate the excess reagent.
D-Calculate the grams of excess reagent remaining.
E-Calculate the percent yield.
I hope this helps! Cheers ^^
For the reaction 2HNO3 + Mg(OH)2 → Mg(NO3) 2 + 2H2O, how many grams of magnesium nitrate are produced from 4 grams of nitric acid, HNO3 ?
Round your answer to the nearest tenth. Do not round your answers until the last step of the problem. If you do, the computer might mark your answer incorrect and you will be asked to complete your second trial for this assessment.
Use the following molar masses:
Element Molar Mass
Hydrogen 1
Magnesium 24
Nitrogen 14
Oxygen 16
Answer:
First check to make sure you have a balanced equation
Second use mole ratios to set up what you need to know
Finally convert the moles to grams using the correct molecular weight
I will get you started
According to the reaction above, one mole of Magnesium Nitrate is produced from 2 moles of Nitric Acid
1 mole of Mg(NO3)2/2 moles of HNO3
5 grams of Nitric acid contains
5 g * 1 mole/63 g of Nitric Acid = 0.079365079 moles
Explanation:
For the reaction 2HNO3 + Mg(OH)2 → Mg(NO3) 2 + 2H2O,0.0793grams of magnesium nitrate are produced from 4 grams of nitric acid, HNO3.
What is magnesium nitrate ?Magnesium nitrates are inorganic substances with the formula Mg(NO3)2x, where x is one of six, two, or zero. Each one is completely white. The hygroscopic anhydrous substance swiftly transforms into the hemihydrate when exposed to air. In both water and ethanol, all the salts are extremely soluble.
Magnesium nitrate is a crystalline (sand-like), flavourless, colourless, or white substance. Both the production of petrochemicals and pyrotechnics employ it as a catalyst.
The inorganic nitrate salt of magnesium is called magnesium nitrate. It functions as fertilizer. It is a magnesium salt and an inorganic nitrate salt.
Convert the moles to grams using the correct molecular weight
According to the reaction
one mole of Magnesium Nitrate is produced from 2 moles of Nitric Acid
1 mole of Mg ( NO3 ) 2 / 2 moles of HNO3
5 grams of Nitric acid contains
5 g * 1 mole/63 g of Nitric Acid
= 0.079365079 gram
Thus, For the reaction 2HNO3 + Mg(OH)2 → Mg(NO3) 2 + 2H2O,0.0793grams of magnesium nitrate are produced from 4 grams of nitric acid, HNO3.
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