b. combine compounds to form elements.
c. are always covalent.
d. hold atoms together to form compounds.
. A pyramid of numbers differs from an ecological pyramid because it
a. shows the amount of energy within each trophic level.
b. displays the number of organisms at each trophic level.
c. is organized by trophic levels, while an ecological pyramid isn't.
d. attempts to describe a food chain or food web.
D. displays the number of organisms at each trophic level.
Hope I was helpful :)
b. CH₃CH(Br)CH(Br)CH₃
c. CH₃CH₂CH(Br)CH₃
d. CH₃CH₂CH₂COOH
e. CH₃CH₂CH₂CH₃
Answer:
1. Sand Casting: Sand casting is a popular method used to create pewter objects. Here's how it's achieved:
- First, a pattern or model of the desired object is created using materials like wood, plastic, or metal.
- The pattern is then pressed into a special type of sand called green sand, leaving an impression.
- Next, the pattern is removed, leaving a cavity in the sand.
- Molten pewter is poured into the cavity and left to cool and solidify.
- Once cooled, the sand is carefully removed, revealing the pewter object.
2. Spin Casting: Spin casting, also known as centrifugal casting, is another way to mold pewter. Here's how it works:
- A rubber mold of the object is created, usually using a master pattern made of wax or another material.
- The rubber mold is placed in a casting machine that rotates at high speed.
- Molten pewter is poured into the mold while it spins.
- The centrifugal force evenly distributes the pewter, filling the mold's cavities.
- As the pewter cools, it solidifies and takes the shape of the mold.
- Once cooled, the mold is opened, and the pewter object is removed.
3. Die Casting: Die casting is a method used for producing high-quality pewter objects. Here's how it's done:
- A metal mold, called a die, is created to match the desired shape of the object.
- Molten pewter is injected into the die under high pressure.
- The pressure ensures that the pewter fills the mold completely and captures all the intricate details.
- After a short cooling period, the die is opened, and the pewter object is ejected.
Explanation:
These are just a few ways to form or mold pewter. Each method has its advantages and is suitable for different types of objects. It's important to choose the appropriate method based on the complexity of the design and the desired quality of the final product.
B1.18x10^-14nm/ms^2
C1.18x10^7nm/ms^2
D1.18x10^9nm/ms^2
E1.18x10^4nm/ms^2
Answer:
E. 1.18x10^4nm/ms^2
Explanation:
The aceleration of the train is given in m/s². We need to conver, first, the meters to nm and then, the seconds to ms as follows:
11.8m/s² * (1x10⁹nm / 1m) = 1.18x10¹⁰nm / s²
Now, as 1s is equal to 1000ms:
1.18x10¹⁰nm / s² * ((1s)² / (1000ms)²)) =
1.18x10⁴nm / ms²
Thus, right option is:
A train's acceleration of 11.8 m/s^2 converts to 11.8*10^7 nm/ms^2 while converting from meters to nanometers and from seconds squared to milliseconds squared.
To convert a value from meters (m) to nanometers (nm), we must multiply by the conversion factor of 1×10^9nm/1m. A nanometer is one billionth (10^-9) of a meter. In this case, the train is accelerating at 11.8 m/s2. Therefore, the acceleration in terms of nanometers per second squared (nm/s2) is 11.8 * 109 nm/s2. To convert this value to nanometer per millisecond squared (nm/ms2), we know there are 1000 milliseconds (ms) in a second (s). Hence, we divided by 1000 squared, resulting in 11.8 * 109 nm/s2 divided by 10002 to get the answer in (nm/ms2). This gives us 11.8*107 nm/ms2, so the correct answer is C.
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Spell out the full name of the compound.
Answer: the mass of an electron is approximately 9.10938356 × 10^-31 kilograms (kg)
Explanation: