Answer:
D
Explanation:
I'm doing USA test prep and I got it right
Answer:
Explanation:
It is D
Make the fan blades out of a lighter material.
Which of the following chemical formulas contains the most molecules?
A. 5CO
B. 3H2O
C. 2Fe2O3
D. 4C3H8
What is the mass of a lead block that has a volume of 30 mL?
O 3.39 grams
O .377 mL
O 265 mL
O 339 grams
Answer:
d
Explanation:
i think it's d, but I'm not sure. my answer is a little different but maybe i used a different number for the density of lead (11.35g/cc)
Choose two different particles found in the air. Explain how they are different and how they are the same
Answer:
Dust and smoke.
Explanation:
Dust and smoke are two different particles present in the air. Dust and smoke are different from one another due to their origin. Smoke formed from burning of materials while dust refers to the soil particles lifted by the wind due to their light weight. Dust and smoke are similar to each other due to their small in size, infinite number means uncountable and light weight.
Air is a mixture of gases and consists of dust particles and water vapor. It consists of small to very large size of particles. Some of them include dust pollen, soot, and liquid droplets.
Dust and soot particles of the air are different as the soot is a fine black particle of carbon and tar. It is made by the incomplete combustion of air. While dust is fine dry particles of matter.Hence they both differ.
Learn more about the two different particles found in the air.
brainly.in/question/35683807.
someone help me plz :))) brainliest
Answer:
Option 2
Explanation:
A clear, pure liquid sample is brought into the lab and exposed to an electrical current. Different gases are
produced on each of the electrodes. The sample is -
a. an element
b. an alloy
c. a compound
d. a polymer
The sample here is a compound. The correct option is c.
What is a compound?A chemical compound is a substance made up of many identical molecules that contain atoms from more than one chemical element and are held together by chemical bonds.
A molecule made up of only one element's atoms is thus not a compound.
The anode undergoes oxidation, while the cathode undergoes reduction. The species being oxidized provides the electrons.
An electrode in an electrochemical cell is referred to as an anode or a cathode depending on the direction of electron flow.
The electrode reacts with the electrolyte at the anode, producing electrons.
These electrons build up at the anode. Meanwhile, another chemical reaction occurs at the cathode, allowing that electrode to accept electrons.
Thus, the correct option is c.
For more details regarding compound, visit:
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Which elements are abundant in visible universe
Hydrogen is the most abundant element in the Universe; helium is second. However, after this, the rank of abundance does not continue to correspond to the atomic number; oxygen has abundance rank 3, but atomic number 8. All others are substantially less common.
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what is love made out of ?
Reaction type
Li + N2
Li3N
Answer:
Combination or synthesis
Explanation:
The given reaction is:
6Li + N₂ → 2 Li₃N
This reaction is a synthesis or combination reaction. 6 moles of Li combines with nitrogen gas to produce 2 moles of Li₃N.
In a synthesis reaction, two substances combines together to give singular product. The formation of compounds from the union of the constituent elements falls into this category of reaction.Use the periodic to fill in the numbers in the electron configurations shown below.
B: 1s2 2sA2pB
A =
2
B =
1
Na: 1s22sC2pD3sE
Answer:
B: 1s²2s²2p¹
Na: 1s²2s²2p⁶3s¹
Explanation:
A = 2
B = 1
C = 2
D = 6
E = 1
Hope that helps.
Answer:
B: 1s2 2sA2pB
A = 2
B = 1
Na: 1s22sC2pD3sE
C = 2
D = 6
E = 1
which element has chemical properties that are most similar to potassium?
a. calcium
b. cesium
c. nitrogen
d. sulfur
Answer:
CESIUM
Explanation:
Potassium is one of the alkali metals. The alkali metals are the elements that make up Group 1 (IA) of the periodic table. The periodic table is a chart that shows how chemical elements are related to one another. The alkali metals also include lithium, sodium, rubidium, cesium, and francium.
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The element which contains similar chemical properties as of Potassium would be:
B). Cesium
'Potassium' is described as the element that is 'soft and waxy in appearance' with the symbol K and atomic number 19 and "Cesium' is also soft in nature and it possesses a goldy finish.
The similarity between the chemical properties of 'Potassium' and 'Cesium' include:
Both are the components of the group of alkali metals. Both of them are highly responsive metals. 'Potassium' and 'Cesium,' both are soft in texture.Thus, option B is the correct answer.
Learn more about 'Chemical properties' here:
brainly.com/question/1728902
Mercury is an element that forms during _____
Answer:
forms of mercury
Explanation:
Answer:
Explanation:
Mercury is an element and a metal that is found in air, water, and soil.Mercury rarely occurs uncombined in nature, but can be found as droplets in cinnabar (mercury sulfide) ores. China and Kyrgyzstan are the main producers of mercury. The metal is obtained by heating cinnabar in a current of air and condensing the vapour.
hope this helps! Have a good day or night! :)
If a 50kg car is pulling a 30kg car, how much force would be required to accelerate the cars at 2m/s/s?
Answer:
160N
Explanation:
The force required to accelerate the two cars can be calculated thus:
F = m × a
Where;
F = force (Newton)
m = mass (kg)
a = acceleration (m/s²)
However, according to the question, a 50kg car is pulling a 30kg car, which means that the mass of the two cars is 50kg + 30kg = 80kg.
a = 2m/s²
F = ma
F = 80 × 2
F = 160N
Which of the following scenarios would not prompt the cell to start dividing
Answer:
what r the options??????
d. what happens when an iron nail is kept in copper sulphate solution?
Answer:
it changes color from blue to light green.
Explanation:
due to copper iron nail functions
Answer:
give the other person brainlieset plz
Explanation:
Can someone help me please!(I will mark you brainliest)
Answer:
ok Look at it and tell me if you think its correct :}
calculate the molar mass of cacl2
Answer:
[tex]\boxed {\boxed {\sf 110.98 \ g/mol}}[/tex]
Explanation:
The molar mass is the mass of a substance in grams per mole.
To find it, add the mass of each element in the compound. These masses can be found on the Periodic Table.
The compound given is:
[tex]CaCl_2[/tex]
The compound has 1 Ca (calcium) and 2 Cl (chlorine).
Mass of Calcium
The molar mass of calcium is 40.08 g/mol There is only one atom of Calcium in CaCl₂, so the number above is what we will use.Mass of Chlorine
The molar mass of chlorine is 35.45 g/mol There are two atoms of chlorine in CaCl₂, therefore we need to multiply the molar mass by 2. 35.45 * 2= 70.9 g/molMolar Mass of CaCl₂
Now, to find the molar mass, add the molar mass of 1 calcium and 2 chlorine. 40.08 g/mol + 70.9 g/mol =110.98 g/molThe molar mass of CaCl₂ is 110.98 grams per mole.
help meeeeeeeeeeeee its impossibleeeeee
Answer:
Nice! If only....
Explanation:
Answer:
omg lol what even is this
Your explanation should include a claim, evidence, and scientific reasoning based on the data provided and the process of photosynthesis.
Answer:
yuh 100% true dude
Explanation:
...............
if a car travels 350 miles in 7 hours what was the speed
Answer:
50 mph
Explanation:
Answer:
5 miles per hour
Explanation:
TRUST ME
Is ceramic a good insulator
A can of cola contains approximately 240 calories. If you consume two cans of cola each day for one week, approximately how many calories did you consume from cola?
Select one:
a. 3,400 calories
b. 70 calories
c. 1,700 calories
d. 480 calories
Part of an important cellular process involving a DNA strand is modeled below
12000
What is the purpose of this cellular process?
F Preserving genetic information for future generations
G Deleting the information in the sequence produced from the DNA template
# Transcribing information in the DNA sequence for use by the cell
J Producing more nucleotides for the DNA sequence
Answer: transcribing information to the dna sequence for use by the cell
Explanation:
PLEASE HELP
Electrical devices have been designed to convert electrical energy to other useful
forms of energy. Choose the device which converts electrical energy to kinetic
energy.
Answer:
B. Fan
Explanation:
The device in the options which converts electrical energy to kinetic
energy is the Fan.
When the fan is plugged to a an electric power source, the electrical energy gets converted to kinetic energy as a result of the movement of the blades in which Kinetic energy is defined as the energy as a result of the motion of a particle or substance.
A solution is
Question 6 options:
a homogeneous mixture.
a compound.
chemically separable.
a heterogeneous mixture.
Answer:
the first one. a homogeneous mixture.
Explanation:
hope this helps :)
how do humans benefit from photosynthesis
Answer:
Explanation:
Without photosynthesis there would be no oxygen in the earth's atmosphere and we wouldn't be here!
The oxidation # (charge) of an element called "lindenium "Ld is + 1 and the oxidation # (charge) of an element called "mendezine symbol "Mz, is -2. What is the chemical formula for the compound called lindenium mendezide?
Answer:
Ld₂Mz
General Formulas and Concepts:
Chemistry - Compounds
Valence shellsWriting chemical compoundsBalancing chargesExplanation:
Step 1: Define
"Lindenium" Ld w/ oxidation charge of +1
"Mendezine" Mz w/ oxidation charge of -2
Step 2: Write Compound
To balance out the charges to be neutral (0), we must counter balance the amount of Ld's with Mz's. We need 2 Ld's with 1 Mz to create a compound with a neutral charge:
2Ld¹⁺ + Mz²⁻
2(+1) + (-2) = (+2) + (-2) = 0 (neutral charge)
Therefore, our compound must be Ld₂Mz.
Which periodic table trend is represented by the blue arrows?
Answer:
Periodic trends are specific patterns that are present in the periodic table that illustrate different aspects of a certain element, including its size and its electronic properties. Major periodic trends include: electronegativity, ionization energy, electron affinity, atomic radius, melting point, and metallic character. Periodic trends, arising from the arrangement of the periodic table, provide chemists with an invaluable tool to quickly predict an element's properties. These trends exist because of the similar atomic structure of the elements within their respective group families or periods, and because of the periodic nature of the elements.
An object is moving across a surface, but it does not gain or lose speed. Which best describes the object’s force?
Answer:
Explanation:
the vector sum of all such forces which equals zero for an object at rest. CASE 1: Considering a basketball of weight 1kg, if it has been kept stationary on the ground, there are two forces acting on it. These are it's weight (gravity) and equal and opposite force from the ground (normal reaction).
Answer:
The net force is zero. :)
Explanation:
The three types of ocean floor sediments are classified according to their _____.
Answer:
Origin
Explanation:
A scientist thinks he found a new metal, so he published a paper about this metal. About 1 week after the scientist published the paper, you noticed a problem with the paper the scientist wrote. You noticed that this metal was not a new metal. In fact, this metal was discovered years ago. You determined this when you saw the atomic emission spectrum. As you read the article, you remembered that each atomic emission spectrum is unique to each element and the atomic emission spectrum matched one that was already discovered. Using the techniques from Chemistry, you ran a Flame Test with a piece of the metal (the metal is safe to use) that you had shipped to you. You found the metal turned the flame yellow. What metal did you have in your possession?
**ANSWER CHOICES**
*Barium
*Calcium
*Strontium
*Copper
*Sodium
Answer:
Sodium
because it burns with a yellow-orange flame.
Explanation:
It relates with Barium which burns with yellowish green flame