Answer:
3.62 g/cm³
Explanation:
density = mass ÷ volume
Therefore, do 12.69 divided by 3.5
What is a primary difference between bacteria that are in the
kingdom Archaea and other bacteria?
Answer:
Is there a way you can give a answer made for a 5th grade
Explanation:
What is the relative humidity if the dry bulb temperature is 16°C and the wet bulb temperature is 16°C?
Which of the following correctly labels the solute and solvent in a solution of ocean water?
Solute: Salt, Solvent: Water
Or
Solute:Water,Solvent:Salt
Hello there!
The solute is salt, and the solvent is water. So the answer is #1.
PS. Can I have Brainliest?
One molecule of a compound weighs 2.93 10–22 g. The molar mass of this compound is:
A)
2.06 g/mol
B)
567 g/mol
C)
168 g/mol
D)
176 g/mol
E)
none of these
Answer:
176 g/mol
Explanation:
To get this, multiply the weight of the molecule by Avogadro's number:
(2.93×[tex]10^{-22}[/tex]) × (6.022×[tex]10^{23}[/tex]) = 176.44 g/mol
Question 5 (10 points) How many moles of Cuci, are needed to react with 4 moles of Al? + 3CuCl2 (aq) → Cu (s) + 2AlCl3 (24) O a 6 moles 1 mole 2 moles OO 8 moles
Answer:
A. 6 moles
Explanation:
This question contains a chemical reaction between aluminum (Al) and Copper(II)Chloride to give copper and aluminum chloride. The unbalanced chemical equation is as follows:
Al (s) + 3CuCl2 (aq) → Cu (s) + 2AlCl3
To balance the equation, we use coefficients in front of Al and Cu to ensure the amount of both are uniform on both sides of the equation. The balanced equation is as follows;
2Al (s) + 3CuCl2 (aq) → 3Cu (s) + 2AlCl3
From the balanced equation, 2 moles of Al reacts with 3 moles of CuCl2
Hence, 4 moles of Al will react with (4 × 3) ÷ 2
= 12 ÷ 2
= 6 moles of CuCl2
Benzoic acid contains 68.8% carbon, 4.95% hydrogen, and 26.25% oxygen. Find the empirical formula of benzoic acid.
Answer:
C7H6O2
Explanation:
Let;
68.8% of Carbon represents 68.8g
4.95% of Hydrogen represents 4.95g
26.25% of Oxygen represent 26.25g
Next, we convert each gram value to mole value by dividing by their respective molar mass {C = 12, H = 1, O = 16}
C = 68.8/12 = 5.73 mol
H = 4.95/1 = 4.95 mol
O = 26.25/16 = 1.64 mol
Next, we divide each mole value by the smallest (1.64mol)
C = 5.73 ÷ 1.64 = 3.49
H = 4.95 ÷ 1.64 = 3.02
O = 1.64 ÷ 1.64 = 1
Next, we multiply each ratio by 2 to obtain our simplest whole number ratio (empirical formula)
C = 3.5 × 2 = 7
H = 3.02 × 2 = 6
O = 1 × 2 = 2
Hence, the ratio of C, H and O is 7:6:2 and the empirical formula of benzoic acid is C7H6O2
how many protons are in phosphorous
Answer:
There are 15 protons in phosphorous.
~Hoped this helped~
~Brainiliest?~
HELP ASAP 20 OR MORE POINTS!!!!
In Brian Greene's "A Physicist Explains Why Parallel Universes May Exist", what reason does Greene give for why he believes parallel universes may exist?
Question 1 options:
Worm holes make traveling between parallel universes possible.
There are only so many ways matter can arrange itself within that infinite universe.
He has seen a parallel universe himself.
Scientists have already proven the existence of parallel universes.
Answer:
B: There are only so many ways matter can arrange itself within that infinite universe.
The idea of a parallel universe was supported by Brian Greene on the basis that there are only so many ways matter can arrange itself within that infinite universe.
A parallel universeMatter is anything that has mass and occupy space. The universe as we know it is filled with matter. The theory of multiple universe holds that there could be another universe apart from this one that we know.
This theory was supported by Brian Greene on the basis that there are only so many ways matter can arrange itself within that infinite universe.
Learn more about universe: https://brainly.com/question/9904853
Which substance is a binary acid?
1,)hydrochloric acid
2.)phosphoric acid
3.)nitrous acid
4.)sulfuric acid
Answer:
1. Hydrochloric acid
Explanation:
Hydrochloric acid
Answer:
4)
Explanation:
formula:H2 SO4
there are 2 H+ ions in 1 molecule of sulfuric acid
thus it has a basicity of 2
Why are isotopes with short half-lives not useful for dating very old rocks?
-because not enough of the parent isotope remains to measure accurately
-because not enough of the daughter product has formed to be detectable
-because neither the parent isotope nor the daughter product will be detectable
-because very old rocks would never have contained these isotopes
Answer:
because not enough of the parent isotope remains to measure accurately. because not enough of the daughter product has formed to be detectable.
Explanation:
Hope it helps
What type of reaction is the following:
lodine + Calcium + Calcium lodide
Answer:
This is called combination reaction
I know that C is a correct answer. But is F correct as well?
Answer: Yes F is also correct.
Explanation:
Describe the two methods to increase the rate at which a substance dissolves.
Nuclear changes differ from normal chemical changes in that all nuclear changes
Answer:
(1) Nuclear reactions entail a transition in the nucleus of an atom, which normally results in the formation of a new substance. Chemical reactions, on the other hand, only involve electron rearrangement and do not involve nuclei modifications. (4) Nuclear reactions are unaffected by the element's chemical form.
Explanation:
Hope this helps!
Please mark me as Brainlinieast.
What is the overall rate order of the following reaction a + 2b → c + d ?
a zero
b first
c second
d third
Answer:
I think zero is the answer^_^
Which statement is NOT true regarding Earth's past climate?
Group of answer choices
Earth was very warm 100 million years ago
Tropical forests and swamps covered much of Earth's surface many years ago
A shallow ocean covered much of North America 450 million years ago
Earth's climate has stayed the same throughout the past
Earth climate has stayed same thougout the past
8. (a) What is an acid-base indicator?
Answer:
Acid–base indicators are generally weak protolytes that change color in solution according to the pH. The acid–base equilibrium of a weak acid type of indicator (HI) in water can be represented as. [I] The acid, HI, and the conjugate base, I−, have different colors. The equilibrium expression for this process is.
Explanation:
The air in a living room has a mass of 60 Kg and a specific heat of 1,020 J/kg°C. What is the change in thermal energy of the air when it warms from 20°C to 25°C?
Answer:
Q = 306 kJ
Explanation:
Given that,
Mass, m = 60 kg
Specific heat, c = 1020 J/kg°C
The temperature changes from 20°C to 25°C.
Let Q be the change in thermal energy. The formula for the heat released is given by :
[tex]Q=mc\Delta T[/tex]
Put all the values,
[tex]Q=60\times 1020\times (25-20)\\\\Q=306000\ J\\\\or\\\\Q=306\ kJ[/tex]
So, 306 kJ is the change in thermal energy.
Please help with this
Using the information in the passage, rank the types of galaxies by their ability to form new stars, from most to least activity.
Answer:
The correct answer is number 2. Elliptical, Spiral, Irregular.
Explanation:
Unfortunately, you did not attach the passage. Without the passage, we do not know what its content is.
So we are going to answer this question with our own knowledge.
The types of galaxies by their ability to form new stars, from most to least activity are "Elliptical, Spiral, Irregular."
That is the way astronomers classify galaxies in scientific terms. These scientists consider that the smallest galaxies or dwarf galaxies have approximately 100 million stars. On the other hand, giant galaxies have billions or trillions of stars. That immense is our universe.
Scientists still studying the universe and the galaxies to understand the way galaxies are formed.
your friend says that there is a kind of fue that only dries when it is exposed to a special type of light.can light cause glue to dry?
Answer:
No. Light is not a physical thing, so it cannot change physical things like glue.
Explanation:
Light is not effective at all to glue, it doesn't do anything at all.
Is a flashlight turned on kinetic or potential energy ?
an elephant puts a force of 30,000 N on its four feet,
which have a total area of 7,500 cm². What is the pressure
it puts on the ground
Explanation:
pressure is Force/area
30000/0.75
Name the Following Binary Ionic Compounds:
a. AgCl
b. ZnO
c. CaBr2
d. SrF2
Explanation:
a.Silver chloride
b.zinc Oxide
c.calcium Bromide
d.strontium difluoride
Need some help on this.
20 pts and brainliest
Which Chemical Reaction is balanced?
Answer:
A
Explanation:
The letter A is the correct answer
1. What is the molar mass of sodium?
11
O
45.90
23
О
16
Answer:
11
Explanation:
Sodium is a chemical element with the symbol Na and atomic number 11.
Answer:
22.99g/mol (in this case 23g/mol)
How many moles of mercury are equivalent to 3.46 x 1023 atoms?
Answer:
3.02 X1023 atoms Ag limol. - - 0.50 1 moles. 6.02241023 atoms.
what is a substance?
Write the number 2.36 × 10-4 in expanded form.
Answer:
0.000236
Explanation:
Move the decimal point 4 times to the left of its original position