Identify the property that justifies each statement. $x=y, \text { so } y=x$

Magnesium constitutes about 2% of Earth’s crust and has three naturally occurring isotopes. Suppose you analyze a mineral and determine that it contains the three isotopes in the following proportions: Mg-24 (abundance = 79%), Mg-25 (abundance = 10%), and Mg-26 (abundance = 11%). If your friend analyzes a different mineral containing magnesium, do you expect her to obtain the same relative abundances for each magnesium isotope? Explain your reasoning.

Decide whether the two equations are equivalent.

$$\begin{array}{l} 4 n+1=n-8 \\ 3 n=-9 \end{array}$$

Describe the energy change associated with ionic bond formation, and relate it to stability.

The lengths of two segments are in the ratio of 5:3, and the longer segment exceeds the shorter by 14 m. Find the length of the longer segment.

Algunas personas de la escuela quieren pasar el verano en España y hablan de lo que harían allí. Escribe frases completas con los elementos dados y el verbo en condicional. Modelo: tú / visitar Barcelona; Tú visitarías Barcelona. Valeria y yo / divertirse mucho

Determine in which block of the periodic table are the elements having the following valence electron configurations. $s^2 p^4$

Write each expression in simplest radical form. $(3 \sqrt{3})^{2}$

If x>1, which value is the greatest? A. $\left(x^{5}\right)^{-2}$. B. $(-x)^{5}$. C. $\frac{x^{6}}{x^{3}}$. D. $\frac{x^{2}}{x^{7}}$

Indicate whether Statement I is true or false and indicate whether Statement II is true or false. If Statement II is a correct explanation of Statement I, write CE on your paper. Statement I - A beam of neutrons is attracted to the charged plates surrounding it. BECAUSE Statement II - neutrons have no charge.

Find the given percent of each number. 33$ of 127

The blue color in some fireworks occurs when copper(I) chloride is heated to approximately 1500 K and emits blue light of wavelength $4.50 \times 10^{2}$ nm. How much energy does one photon of this light carry?

Explain the difference between a chemical change and a physical change. Is the combustion of gasoline a chemical change or a physical change? Explain your answer.

Use the system below to answer each question.

$$\begin{array}{c} y=-x \\ x^{2}+y^{2}=8 \end{array}$$

a. Algebraically solve the system. b. To check your answer to part (a), graph the system.