CTBA 1 Retest

A chemical equation for the reaction between calcium hydroxide, Ca(OH)_2, and sulfuric acid, H₂SO_4, is shown. The masses of some of the reactants and products are given in grams.

How many grams of sulfuric acid were used in the reaction?

• 62 g

• 98 g

• 36 g

• 100 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

There are (a)   number of Ag atoms, (b)   number of Cu atoms, (c)   number of N atoms, and (d)   number of O atoms.

• 2
• 1
• 6

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

NGSS.MS-PS1-1

The Law of Conservation of Mass states-

• That in order to conserve mass we should always recycle our waste.

• That conservation efforts are the only way to preserve the mass that exists in natural habitats.

• That the mass in chemical reactions can not be created nor destroyed, just rearranged.

• That you should use only the minimum amount of chemicals necessary in a chemical reaction in order to conserve your supply of that chemical.

Tags

NGSS.MS-PS1-5

A chemical equation is shown. 2H₂O₂ (Liquid hydrogen peroxide) → 2H₂O (Liquid water) + O₂ (Oxygen gas) Which statement correctly compares the number of atoms in the reactant and in the products?

• The number of atoms in each molecule of liquid water is equal to the number of atoms in each molecule of oxygen gas.

• The number of atoms in each molecule of hydrogen peroxide is equal to the number of atoms in each molecule of oxygen gas.

• The total number of atoms in the hydrogen peroxide molecules is equal to the total number of atoms in the liquid water and oxygen gas molecules.

• The total number of atoms in the hydrogen peroxide molecules is equal to the total number of atoms in each molecule of liquid water.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

An equation for a chemical reaction is shown. NaOH + HCl → NaCl + H₂O Which statement provides evidence that mass is conserved in the reaction?

• Two new substances are formed in the products.

• Water is one of the products, but not one of the reactants.

• Two hydrogen atoms are in the reactants, and two hydrogen atoms are in the products.

• One chlorine atom pairs with one sodium atom in the products, and one chlorine atom pairs with one hydrogen atom in the reactants.

Tags

NGSS.MS-PS1-5

Which of the following is an example of an element?

• FeO

• Salt Water

• Cl

• Air

Which of the following correctly describes a heterogeneous mixture?

• It is made of two or more different types of atoms that are chemically combined.

• It has a uniform composition throughout.

• It is made of only one type of atom.

• It has distinctive parts that can be separated.

Which of the following BEST models a homogeneous mixture?

• Place salt in a cup of water then stir until the particles disappear.

• Mix lettuce in a bowl with a mixture of other vegetables.

• Mix different samples of soil such as clay, silt, and sand in water then allow the particles to settle overnight.

• Separate iron filings from baking soda using a magnet.

What elements are present in the sodium bicarbonate molecule NaHCO₃?

• C, H, and N

• H, C, Na, and O

• O, Na, and Co

• N, H, C, and O

Tags

NGSS.MS-PS1-1

A pH scale measures the acidity and basicity of solutions on a scale from 0 to 14. The pH value of ___ indicates a neutral substance.

• 7

• 0

• 3

• 14