Answer:
answer 2 I believe bbcc x
Answer: When waves travel from one medium to another the frequency never changes. As waves travel into the denser medium, they slow down and wavelength decreases. Part of the wave travels faster for longer causing the wave to turn.
Explanation:
Unstable, radioactive atom emits alpha and gamma ray to transform into a stable atom.
Emitting an alpha particle, decreases the mass number by four and atomic number by two.
Emitting gamma ray reduces the excess energy of the radioactive atom.
Answer:
1.) NiSO₄; 2.) Al₂O₃; 3.) Ca(ClO₃)₂; 4.) (NH₄)₃P; 5.) CuNO₃
Step-by-step explanation:
We can use the <em>criss-cross method</em> to work out the formulas. The steps are
- Write the symbols of the anion and cation.
- Criss-cross the numbers of the charges to become the subscripts of the other ion (as in the image).
- Write the formula with the new subscripts.
- Divide the subscripts by their highest common factor.
- Omit all subscripts that are 1.
If we use this method, the formula for the compound formed from Na⁺, SO₃²⁻ becomes Na₂SO₃.
1.) Ni²⁺ + SO₄²⁻ ⟶ Ni₂(SO₄)₂ ⟶ NiSO₄
2.) Al³⁺ + O²⁻ ⟶ Al₂O₃
3.) Ca²⁺ + ClO₃⁻ ⟶ Ca(ClO₃)₂
4.) NH₄⁺ + P³⁻ ⟶ (NH₄)₃P
5.) Cu⁺ + NO₃⁻ ⟶ CuNO₃
TiO2
since Ti has 2 valence e-
to O's 1