Science NWIS 6.1,6,2 Revision

Science NWIS 6.1,6,2 Revision

8th Grade

13 Qs

quiz-placeholder

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Science NWIS 6.1,6,2 Revision

Science NWIS 6.1,6,2 Revision

Assessment

Quiz

Science

8th Grade

Practice Problem

Easy

Created by

Ifthikhar Rizvi

Used 1+ times

FREE Resource

13 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why does the powdering of calcium carbonate increase the speed of its reaction with an acid?

It increases the mass of calcium carbonate.

It increases the surface area of the calcium carbonate

The powder becomes more concentrated.

The powder floats on top of the acid.

2.

FILL IN THE BLANK QUESTION

1 min • 1 pt

What does the symbol ⇌ mean?

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

The solvent ethanol is produced by the formation of sugar, using yeast. Which graph correctly shows how the speed of fermentation changes with temperature?

A

B

C

D

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Oxygen is formed when manganese (IV) oxide is added to hydrogen peroxide, H2O2. 2H2O2→ 2H2O + O2 In this reaction, manganese (IV) oxide acts as

acid

base

catalyst

drying agent

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

1. When lumps of calcium carbonate react with hydrochloric acid, carbon dioxide gas is released. CaCO3(s) + 2HCl(aq) → CaCl2 (aq) + CO2 (g) + H2O(l) what will the following have on the rate of reaction , Increasing temp

None of the above

Slower

Faster

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which changes of condition slow down the reaction between magnesium and air? 1. Heating the magnesium to a higher temp, 2. using a higher proportion of oxygen in the air, 3. using magnesium ribbon instead of powdered magnesium

1

2

3

all of the above

7.

FILL IN THE BLANK QUESTION

1 min • 1 pt

How many elements are in the periodic table?

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