Answer:
i think it is hydrogen
Explanation:
Answer:
They are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
How many molecules are in 23 moles of oxygen (O2)? Round the answer to one digit past the decimal point. If the answer is less than 1, you must type a zero before the decimal point.
To Find :
How many molecules are in 23 moles of oxygen (O₂).
Solution :
We know, 1 mole of any atom/molecule contains 6.022 × 10²³ numbers of atoms/molecules.
So, number of molecules in 23 moles of O₂ are :
[tex]n= 23\times 6.022\times 10^{23}\\\\n =138.506\times 10^{23}\\\\n = 1.385 \times 10^{25}\ molecules[/tex]
Hence, this is the required solution.
Predict the products for a reaction between the following:
Ca (s) + AgNO3 (aq) -->
Answer:
Ca + AgNO3 ---> Ca(NO3)2 + Ag
Calcium + silver nitrate ---> Calcium nitrate + silver
also ...reaction type is Single displacement reaction .
hope this answer's your question.
If an atom has an atomic mass of 19 and an atomic number of 9, how many protons, neutrons and electrons does it have?
Answer:
protons = 9
neutrons = 10
electrons = 9 because it is neutral atom
Explanation:
atomic number= protons = 9
atomic mass= protons + neutrons
19= 9 + n
n= 10
10. Anna wants to measure the water temperature in the pail. What instrument
she needs to use?
A. Thermometer
C. Barometer
B. Speedometer
D. Anemometer
please answer me
Answer: A. Thermometer
Explanation:
A thermometer is used to measure temperature , while the others measure different things.
I need help with number 3
the equation is 4Al+3O2=2Al2O3
PLEASE HELP ME!! THIS IS DUE SOON!!
Determine the number of H2O molecules in 837.4 g of H2O.
Answer in units of molec.
Answer:
Divide 837.4 g by 18.015 g/mol to get moles of H2O
Multiply moles of H2O by 6.022 x 10^23 molecules/mol to get molecules (of H2O in 837.4 g)
Round off your final answer to 4 sig figs.
Thank you and please rate me as brainliest as it will help me to level up
Hey ima Girl What event is Caused by Gravity
Answer:
D. The water enters an aquifer through infiltration.
Explanation:
Hope it helps you:)
would you like to be my friend?:)
What is the mass, in grams, of 9.01 x 1024 molecules of methanol (CH, OH) ?
Answer:
480.6 g
Explanation:
Given data:
Number of molecules of methanol = 9.01 ×10²⁴
Mass in gram = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules
9.01 ×10²⁴molecules ×1 mol /6.022 × 10²³ molecules
1.5 ×10¹ mol
15 mol
Mass in gram:
Mass = number of moles × molar mass
Mass = 15 mol × 32.04 g/mol
Mass = 480.6 g
Use the drop-down menus to answer the questions.
As the amount of surface area increases, what happens to the rate of this reaction?
If the antacid tablet were broken into eight pieces, what would be a reasonable estimate for the time of reaction?
Answer:
the rate is faster, and the time of reaction is 28 seconds
Explanation:
i did the test
Answer:
The rate is faster, 28 seconds
Explanation:
Which process has the minimal effect on heating our atmosphere?
1.Conduction,
2.Convection,
3.Radiation
Answer:
Radiation you're welcome <3
Which statement best describes what happens when a person sees an orange t-shirt?
The t-shirt absorbs orange light from human eyes.
Human eyes reflect orange light back to the t-shirt.
Orange light reflected from the t-shirt enters human eyes.
Orange light absorbed by the t-shirt is perceived by the human eyes.
Answer:
The correct answer is - Orange light reflected from the t-shirt enters human eyes.
Explanation:
Human eyes and brain are altogether able to detect the color of the object by translating the light which is reflected by the object and transmitted by the light receptors in the eyes ad brain translate light to color.
The objects are able to absorb some colors and reflect others on the basis of their wavelength, The reflected colors are detected by our eyes and brain and objects appear to be a particular color. like here, the orange color is reflected by the t-shirt and enters in human eyes.
Answer:
its c
Explanation:
Which chemical formula shows an ionic compound?
NaCl
CO2
C6H12O6
N2O
Answer:
NaCl
Explanation:
The only chemical species that shows an ionic compound is NaCl.
NaCl is an ionic compound that conducts electricity in molten state due to presence of free mobile electrons in the structure when molten.
An ionic bond typically forms between a metal and non-metal. In the compound NaCl, Na is the metal and Cl is the non-metal. The difference in electronegativity allows for this bond type to form.Answer:
it is A i took the test could i have the crown please
Explanation:
Al(s) + HCl(aq)→AlCl3(aq) + H2(g) Balance the equation.
Answer:
2Al(s) + 6HCl(aq)→2AlCl3(aq) + 3H2(g)
Where are people exposed to chemicals?
O A. Mostly in public buildings
O B. Only in the home
C. Mostly outside
O D. Everywhere
Answer:
I believe the correct answer is D.
Explanation:
You are breathing in dinitrogen and dioxygen. You exhale dinitrogen and carbon dioxide. And the atmosphere contains traces of other gases. You drink water. You have a wash with water, and soap. You eat carbohydrates and proteins. You ride to work on a vehicle powered by hydrocarbons, which spits out carbon dioxide exhaust fumes, and also some nitrogen oxides. And so your exposure to chemicals is pervasive, and unavoidable.
Answer:
d
Explanation:
The example of water boiling away is used to illustrate that water
is not always soluble.
is an unstable substance.
lacks thermal properties.
can change from solid to gas.
Answer:
change from solid to gas
Hii!! I believe the correct answer is D. can change from solid to gas. ((:
Calculate the pH of substance one if it has an [OH-] that is equal to 3.2* 10^-8
Answer:
pH = 6.5
Explanation:
Given data:
pH of substance = ?
[OH⁻] concentration = 3.2×10⁻⁸
Solution:
pOH = -log[OH⁻]
pOH = -log[3.2×10⁻⁸]
pOH = 7.5
we know that,
pH + pOH = 14
pH = 14- pOH
pH = 14 - 7.5
pH = 6.5
I need help asap, thank you.
Answer: Answer to your question is B. I did a science
Explanation: Test was to see which would dissolve fastest...
the forces that moves against movement
Answer:
Friction
Explanation:
What is oxidized in a galvanic cell made with silver and nickel electrodes?
A. The silver metal
B. The nickel metal
C. The nickel ions
D. The silver ions
Answer:
B. The nickle Metal
Explanation:
A P E X
Which one is idk what it is giving brainliest
Answer:
B or C
Explanation:
I don't really know sorry.
Answer:
D
Explanation:
I think D I also took the test.
What is true of boric acid?
PLEASE HELP
equation for the complete combustion of a hydrocarbon fuel.
Answer:
the general equation for complete combustion reactions is fuel + O2 __ Co2 + H2O .Which of the following is a heterogeneous mixture?
A. Oil and Vinegar
B. Air
C. Milk
D. Vinegar in water
Answer:
B
Explanation:
b/c air is not seen by eye
Identify each of the following types of compounds as Binary Ionic, Ternary Ionic, Binary Acids, or Oxyacids.
1) K2HPO4
2) H2CO3(aq)
3) (NH4)3P
4) Na2O2
5) Hg(NO2)2
6) Al(ClO2)3
Answer:
the words to identify them is them in kaps right
Explanation:
Will mark you as brainiest!
Aluminum has the larger atomic radius.
silicone is larger than carbon.
Aluminum is larger than silicon
I think silicon is the answer
Deposits of gold can be found in the deep ocean. true?
Answer:
yes that should be true
Answer:
true
Explanation:
One study found there is only about one gram of gold for every 100 million metric tons of ocean water in the Atlantic and north Pacific
what is an atomic mass unit?
Answer:
A unit of mass used to express atomic and molecular weights, equal to one-twelfth of the mass of an atom of carbon-12. It is equal to approximately 1.66 x 10-27 kg.
Explanation:
Answer:
a unit of mass used to express atomic and molecular weights, equal to one-twelfth of the mass of an atom of carbon-12. It is equal to approximately 1.66 x 10-27 kg.
Explanation:
hope it helps, mark brainliest please
which three statements giving brainluiest
Answer:
will you be my Gf?:)
I am ready to be your gf:)
Which phrase best describes bronze?
o a pure metal
o a copper-tin alloy
o a mineral ore containing copper and tin
an ionic compound of copper and tin
Answer:
o A copper-tin alloy
Explanation:
Bronze is composed by copper and tin. This means it is not a pure metal.Bronze cannot be mined, so it is not a mineral ore.An ionic compound of copper and tin could also be theoretically used to describe a non-solid ionic compound of copper and tin. However bronze is solid.Hence the answer is A copper-tin alloy.I didn’t get any help my recent question so I’m posting it again to see if anybody sees it this time
Question!!!
Determine half life exploration of isotopes