The students conclude the cells are plant cells.
Explanation:
Carbon-12 atoms have stable nuclei because of the 1:1 ratio of protons and neutrons.
Carbon-14 atoms have nuclei which are unstable. C-14 atoms will undergo alpha decay and produce atoms of N-14. Carbon-14 dating can be used to determine the age of artifacts which are not more than 50,000 years old.
The first one.........................
Answer:
Explanation:
This is an example of a limiting reactant question, and is very common as a general chemistry problem.
We first see the balanced equation, that is:
2CuCl2+4KI→2CuI+4KCl+I2
We first need to find the limiting reactant
We see that 0.56 g of copper(II) chloride (CuCl2) reacts with 0.64 g of potassium iodide (KI) . So, let's convert those amounts into moles.
Copper(II) chloride has a molar mass of
134.45 g/mol . So in 0.56 g of copper(II) chloride, then there exist
0.56g134.45g/mol≈4.17⋅10−3 mol
Potassium iodide has a molar mass of
166 g/mol . So, in 0.64 g of potassium iodide, there exist
if it wrong i am sorry
<h3>
Answer:</h3>
1082.96 L
<h3>
Explanation:</h3>
We are given;
- Initial volume of helium gas, V1 = 793 L
- Initial temperature, T1 = 16.9°C
But, K = °C + 273.15
- Thus, initial temperature, T1 is 290.05 K
- Initial pressure, P1 = 759 mmHg
- New pressure at 4.05 km, P2 = 537 mmHg
- New temperature at 4.05 km, T2 = 7.1 °C
= 280.25 K
Assuming we are required to calculate the new volume at the height of 4.05 km
We are going to use the combined gas law.
- According to the combined gas law;
Therefore, the new volume of the balloon at the height of 4.05 km is 1082.96 L
