All categories

4 years ago

Choose all the answers that apply.

Chemistry

2 answers:

erastova [34]4 years ago

8 0

Dissolve easily in water, high melting points, conduct electricity when melted

schepotkina [342]4 years ago

4 0

Answer:

Dissolve easily in water, high melting points, conduct electricity when melted

Explanation:

You might be interested in

What does it means when your boyfriend doesnt talk to you

d1i1m1o1n [39]

Either he’s busy, or he is just trying to ignore you.

Need more info tho

7 0

4 years ago

One of the reactions in a blast furnace used to reduce iron is shown above. How many grams of Fe2O3 are required to produce 15.5

Salsk061 [2.6K]

Answer : The correct option is, (b) 22.1 g

Solution : Given,

Mass of iron = 15.5 g

Molar mass of iron = 56 g/mole

Molar mass of $Fe_2O_3$ = 160 g/mole

First we have to calculate the moles of iron.

$\text{Moles of Fe}=\frac{\text{Mass of Fe}}{\text{Molar mass of Fe}}=\frac{15.5g}{56g/mole}=0.276moles$

Now we have to calculate the moles of $Fe_2O_3$ .

The balanced reaction is,

$Fe_2O_3+3CO\rightarrow 2Fe+3CO_2$

From the balanced reaction, we conclude that

As, 2 moles of iron obtained from 1 mole of $Fe_2O_3$

So, 0.276 moles of iron obtained from $\frac{0.276}{2}=0.138$ mole of $Fe_2O_3$

Now we have to calculate the mass of $Fe_2O_3$

$\text{Mass of }Fe_2O_3=\text{Moles of }Fe_2O_3\times \text{Molar mass of }Fe_2O_3$

$\text{Mass of }Fe_2O_3=(0.138mole)\times (160g/mole)=22.08g=22.1g$

Therefore, the amount of $Fe_2O_3$ required are, 22.1 grams.

6 0

4 years ago

What are the primary components of rocks?

Butoxors [25]

The primary components of rocks are minerals.

4 0

3 years ago

I would appreciate if somebody help me please!!! Pt2 posted

nignag [31]

The disease prevention methods are as follows:

Influenza: Avoid close contact with sick people; Cover your mouth and nose, Clean your hands
Salmonella: wash hands properly; keep food area clean; cook food properly
Type 2 Diabetes : exercise regularly; reduce sugar intake; quit smoking
HIV/AIDS: Avoid sharing of unsterilized sharp objects; avoid unprotected sex; screen blood before transfusion
Heart disease: avoid trans fat; exercise regularly; avoid smoking
Whooping cough: wear face masks; wash regularly; get vaccinated

<h3>What is the disease prevention?</h3>

Disease prevention refers to the steps taken to protect oneself from developing a particular disease.

The disease prevention methods for the given diseases is as follows:

Influenza: Avoid close contact with sick people; Cover your mouth and nose, Clean your hands
Salmonella: wash hands properly; keep food area clean; cook food properly
Type 2 Diabetes : exercise regularly; reduce sugar intake; quit smoking
HIV/AIDS: Avoid sharing of unsterilized sharp objects; avoid unprotected sex; screen blood before transfusion
Heart disease: avoid trans fat; exercise regularly; avoid smoking
Whooping cough: wear face masks; wash regularly; get vaccinated

In conclusion, disease prevention is the best policy in health care.

Learn more about disease prevention at: brainly.com/question/13341436

#SPJ1

8 0

2 years ago

How many minutes should 750 mL of water take to boil?

Ivenika [448]

Heat require to boil 750 g water from 25 C0to 100 C0

Q = m s dT

= 750 g * 4.2 cal /g /K * (100 - 25)

= 236.25 * 103 J

If stove is supplying 1000 W power then time required is:

Q = P *t

236.25 * 103 = 1000 * t

t = 236.25 s

Thus 236.25 s is required by a 1000 W power supplying stove to boil 750 mL water

6 0

3 years ago

Read 2 more answers