1. Which is always true about an exoplanet?

It is the same size as Earth.

O

It flies around another stath

O

It has the same temperature as Earth.

It flies around our Sun.

Calculate the molarity of na + ions in 135 ml of a solution containing 5.32 g nacl and 1.20 g na2so4.

The goal of this experiment is to separate a mixture of two unknown compounds into individual components and to identify the compounds. Answer the questions below. More than one answer may be possible.

What is the kinetic energy of a 150kg object that is moving with a speed of 15m/s?

The electronic configuration of an element is given below. 1s22s22p63s1 Which statement about the reactivity of the element is true? A. It is reactive because it has a full outermost energy level. B.

Which of the following reactions is endothermic? H2 (g) + ½O2 (g) → H2O (g), ΔH = - 57.82 kcal ½N2 (g) + O2 (g) + 8.1 kcal → NO2 (g) ½N2 (g) + 3/2H2 (g) → NH3 (g) + 11.0 kcal C (diamond) + O2 (g) → CO2, ΔH = - 94.50 kcal

Explain, in terms of electrons, why the radius of a calcium ion is smaller than the radius of a calcium atom.

The silkworm feeds on what

For the reaction? Fe+? H2o ⇀↽? Fe3o4+? H2, a maximum of how many grams of fe3o4 could be formed from 354 g of fe and 839 g of h2o? Answer in units of g

Quicklime (CaO) is produced by the thermal decomposition of calcium carbonate (CaCO3). Calculate the volume of CO2 at STP produced from the decomposition of 152 g CaCO3 by the reaction. CaCO3 - > CaO + CO2

What is the nearest star in Gemini