The Dirtiest place in the school?

Aim: To find the dirtiest place at HHS


Hypothesis: I think the Gym floor is the dirtiest place because lots of people go there to play around and they get all sweaty and then it drips every where.

Equipment: Cotton buds,Agar dishes, cellotape

Method: Take cotton bud and wipe it firmly over the surface, then wipe it across the agar jelly carefully. Seal the agar plate with cellotape and write the location on the tape. Store upside down in a dark location. 

The cleanest place was Mr stocks door handle because there was nothing on there.

The dirtiest place is the Gym floor because there was a whole agar was full of yellow.

I was surprised that Mr stocks door handle because he does experience.

The Rc laptop grew the most fungus 

The gym floor has the most bacteria 

Makeing Biltong (Beef jerky)

Aim: I want to find out how to make Biltong

Method:

• Meat
• 100ml brown sugar 
• 30ml coarse salt 
• 15ml bicarbonate soda (this softens the meat)
• 1 tbsp cracked black peppers 

Instructions

1. Slice the raw meat into 1-2cm wide 
2. Place the raw meat into a bowl
3. Then pour the salt and the spices then grab the raw meat and rub the salt and the [all over it NOT covering the hole thing
4. Tie the raw meat with the salt and spices with string at the end NOT THE MIDDLE.

result

Discussion: 

When I taste it, a explosion of salt in my mouth I made a funny face as I bite it.

Why did we salt the meat?

We salted the meat because salt dehydrate the meat so the mould and bacteria can't grow.

Growing Mold

Question>what causes bread to go off
Hypothesis>being left in the air, Being moist/damp/humid,being left in a warm place
Equipment>1/2 slice of bread sandwich  bag ( per slice) 1/2 a paper towel 10mls of water
method>

This was some bread I thought that was interesting 

what is the best condition for growing mold?

having it in the dark place and with air in the bag and water because the bread soaks up the water and having no light for then the sun will not get the bread hot. 

Mold is mold is kind of a good thing because penicillin is good for getting rid of bugs.

what is green mold? 

Science Badge Question 7

How does milk become yogurt 

Hypothesis> I think milk becomes yogurt because milk thickens if you add cream and mix it up then add fruit then put in the freezer. 

Materials> Milk,Yogurt (fresh plain)

Method> In a beaker add 150mls of trim milk and 2tsps of Acidophilus  yogurt.stir to mix. leave out over night.Repeat this for the cream and with trim(milk)

observation 
trim-When I looked at the trimed milk it looked normal it looked like milk ,With bubbles 
cream- When I looked at the cream Ihad a hard look at it and it was a light yellow 
blue- When I looked at the blue milk it looked flat ,No bubbles or anything

At what temp does bacteria?
What temp is a fridge?
What is the healthy temp of a human? 

The cream one looks like this 
The cream smells gross

The blue looks like this 

It smells like milk

And the trim looks like this 

It smells like yogurt 

What happened to change it 

The bacteria reproduced 

The bacteria fed off the sugar in the milk
The trim milk made a thinner type of yogurt than the others because it has less sugar. 

We let the milk stay out for 2 days and then placed the the beakers in the fridge. The results were not very good but it could change. 

If we got to do it again I would leave the milk in the fridge for longer.