2. Many calculations in chemistry will involve certain symbols, such as the symbol triangle or delta
What does this symbol stand for or mean?
A. "The total"
B. "The change in"
C. "The unit"
D. "The formula"

B. "The change in"

I saw that symbol a lot in chemistry and physics so I immediately recognized it.

Which group of elements can act as semiconductors?

Please help me
How many hydrogen(H) atoms are in 3(NH₄)₂Cr₂O₇
And How many Nitrogen(N) atoms are in 3(NH₄)₂Cr₂O₇

Calculate the molarity of a solution prepared by dissolving 13.0 g of Na2CrO4 in enough water to produce a solution with a volume of 800. mL .

Express the molarity to three significant digits.

Select the correct answer from A, B, C, D & E for each statement given below:
A: Anthracite B: Diamond
C: Carbogen D: Urea E: Lampblack
1. An allotrope of carbon used as a tip for deep boring drills.
2. The type of coal with the highest carbon content.
3. An allotrope of carbon, obtained by burning kerosene oil in a limited supply of air.
4. A nitrogenous fertilizer obtained from carbon dioxide.
5. A compound which finds use for a victim of carbon monoxide poisoning.

The process by which oxygen reacts with iron minerals in rock to form rust is called

Which statements are correct about a flowering plant? It may have both male and female flowers. It may have only male or female flowers. It may have both male and female parts in the flower. It must have both male and female parts in the flower.

Write the correct formula for the following compounds.

1. One ingredient in organic fertilizer contains an equal number of sodium and nitrogen atoms and three times as many oxygen atoms as nitrogen

atoms.

2. A major component of rocket fuel is hydrazine, a compound which contains two nitrogen atoms and twice as many of hydrogen atoms.

3. One of the gases responsible for acid rain contains sulphur atom for every three atoms of oxygen.

4. This compound contains one Lithium atom for every three atoms of Bromine.

5. Butane is a compound that is used as fuel in lighters and camp burners. It contains four carbon atoms and ten hydrogen atoms.​

Which object would have a greater velocity change?

Which environmental conditions contribute most to the spread of bacteria?
O A. cold temperatures and low humidity
B. warm temperatures and low humidity
oc, cold temperatures and high humidity
O
D. warm temperatures and high humidity